GZipStreamとは? わかりやすく解説

GZipStream クラス

メモ : このクラスは、.NET Framework version 2.0新しく追加されたものです。

ストリーム圧縮および圧縮解除実行するために使用するメソッドプロパティ提供します

名前空間: System.IO.Compression
アセンブリ: System (system.dll 内)
構文構文

Public Class GZipStream
    Inherits Stream
public class GZipStream : Stream
public class GZipStream extends Stream
public class GZipStream extends
 Stream
解説解説
使用例使用例

GZipStream クラス使用してファイル圧縮および圧縮解除実行するコード例次に示します

Imports System
Imports System.IO
Imports System.IO.Compression



Public Class GZipTest
    Shared msg As String
   Public Shared Function
 ReadAllBytesFromStream(stream As Stream, buffer() As
 Byte) As Integer
      ' Use this method is used to read all bytes from a stream.
      Dim offset As Integer
 = 0
      Dim totalCount As Integer
 = 0
      While True
         Dim bytesRead As Integer
 = stream.Read(buffer, offset, 100)
         If bytesRead = 0 Then
            Exit While
         End If
         offset += bytesRead
         totalCount += bytesRead
      End While
      Return totalCount
   End Function 'ReadAllBytesFromStream
   
   
   Public Shared Function
 CompareData(buf1() As Byte, len1 As
 Integer, buf2() As Byte, len2 As Integer) As Boolean
      ' Use this method to compare data from two different buffers.
        If len1 <> len2 Then
            msg = "Number of bytes in two buffer are different"
 & len1 & ":" & len2
            MsgBox(msg)
            Return False
        End If
      
      Dim i As Integer
      For i = 0 To len1 - 1
         If buf1(i) <> buf2(i) Then
                msg = "byte " & i & "
 is different " & buf1(i) & "|"
 & buf2(i)
                MsgBox(msg)
                Return False
         End If
        Next i
        msg = "All bytes compare."
        MsgBox(msg)
        Return True
   End Function 'CompareData
   
   
   Public Shared Sub GZipCompressDecompress(filename
 As String)
        msg = "Test compression and decompression on file "
 & filename
        MsgBox(msg)

        Dim infile As FileStream
      Try
         ' Open the file as a FileStream object.
         infile = New FileStream(filename, FileMode.Open, FileAccess.Read,
 FileShare.Read)
            Dim buffer(infile.Length - 1) As
 Byte
         ' Read the file to ensure it is readable.
            Dim count As Integer
 = infile.Read(buffer, 0, buffer.Length)
         If count <> buffer.Length Then
                infile.Close()
                msg = "Test Failed: Unable to read data from file"
                MsgBox(msg)
                Return
         End If
         infile.Close()
         Dim ms As New MemoryStream()
         ' Use the newly created memory stream for the compressed data.
         Dim compressedzipStream As New
 GZipStream(ms, CompressionMode.Compress, True)
         compressedzipStream.Write(buffer, 0, buffer.Length)
         ' Close the stream.
            compressedzipStream.Close()

            msg = "Original size: " & buffer.Length
 & ", Compressed size: " & ms.Length
            MsgBox(msg)

         ' Reset the memory stream position to begin decompression.
         ms.Position = 0
         Dim zipStream As New
 GZipStream(ms, CompressionMode.Decompress)
         Dim decompressedBuffer(buffer.Length + 100) As
 Byte
         ' Use the ReadAllBytesFromStream to read the stream.
         Dim totalCount As Integer
 = GZipTest.ReadAllBytesFromStream(zipStream, decompressedBuffer)
            msg = "Decompressed " & totalCount
 & " bytes"
            MsgBox(msg)

         If Not GZipTest.CompareData(buffer,
 buffer.Length, decompressedBuffer, totalCount) Then
                msg = "Error. The two buffers did not compare."
                MsgBox(msg)

         End If
         zipStream.Close()
        Catch e As Exception
            msg = "Error: The file being read contains invalid
 data."
            MsgBox(msg)
        End Try

   End Sub 'GZipCompressDecompress
   
    Public Shared Sub Main(ByVal
 args() As String)
        Dim usageText As String
 = "Usage: GZIPTEST <inputfilename>"
        'If no file name is specified, write usage text.
        If args.Length = 0 Then
            Console.WriteLine(usageText)
        Else
            If File.Exists(args(0)) Then
                GZipCompressDecompress(args(0))
            End If
        End If
    End Sub 'Main
End Class 'GZipTest 
using System;
using System.IO;
using System.IO.Compression;

public class GZipTest
{
    public static int ReadAllBytesFromStream(Stream
 stream, byte[] buffer) 
    {
    // Use this method is used to read all bytes from a stream.
    int offset = 0;
    int totalCount = 0;
        while (true) 
        {
        int bytesRead = stream.Read(buffer, offset, 100); 
            if ( bytesRead == 0) 
            {
            break; 
            }
    offset += bytesRead;
    totalCount += bytesRead; 
        }
    return totalCount;
    } 

    public static bool CompareData(byte[]
 buf1, int len1, byte[] buf2, int len2) 
    {
        // Use this method to compare data from two different buffers.
        if (len1 != len2) 
        { 
        Console.WriteLine("Number of bytes in two buffer
 are different {0}:{1}", len1, len2);
        return false;
        }

        for ( int i= 0; i< len1; i++) 
        {
            if ( buf1[i] != buf2[i]) 
            {
            Console.WriteLine("byte {0} is different {1}|{2}", i, buf1[i],
 buf2[i]);
            return false;
            }
        }
    Console.WriteLine("All bytes compare.");
    return true; 
    }

    public static void GZipCompressDecompress(string
 filename)
    {
    Console.WriteLine("Test compression and decompression on file {0}",
 filename);
    FileStream infile;
        try
        {
        // Open the file as a FileStream object.
        infile = new FileStream(filename, FileMode.Open, FileAccess.Read,
 FileShare.Read);
        byte[] buffer = new byte[infile.Length];
        // Read the file to ensure it is readable.
        int count = infile.Read(buffer, 0, buffer.Length);
            if ( count != buffer.Length) 
            {
            infile.Close();
            Console.WriteLine("Test Failed: Unable to read data from file");
 
            return;
            }
        infile.Close();
        MemoryStream ms = new MemoryStream();
        // Use the newly created memory stream for the compressed data.
        GZipStream compressedzipStream = new GZipStream(ms , CompressionMode.Compress,
 true);
        Console.WriteLine("Compression");
        compressedzipStream.Write(buffer, 0, buffer.Length);
        // Close the stream.
        compressedzipStream.Close();
        Console.WriteLine("Original size: {0}, Compressed size: {1}", buffer.Length,
 ms.Length);

        // Reset the memory stream position to begin decompression.
        ms.Position = 0;
        GZipStream zipStream = new GZipStream(ms, CompressionMode.Decompress);
        Console.WriteLine("Decompression");
        byte[] decompressedBuffer = new byte[buffer.Length + 100];
        // Use the ReadAllBytesFromStream to read the stream.
        int totalCount = GZipTest.ReadAllBytesFromStream(zipStream,
 decompressedBuffer);
        Console.WriteLine("Decompressed {0} bytes", totalCount);

        if( !GZipTest.CompareData(buffer, buffer.Length, decompressedBuffer,
 totalCount) ) 
        {
        Console.WriteLine("Error. The two buffers did not compare.");
        }
    zipStream.Close(); 
        } // end try
        catch (InvalidDataException)
        {
            Console.WriteLine("Error: The file being read contains invalid data.");
        }
        catch (FileNotFoundException)
        {
            Console.WriteLine("Error:The file specified was not found.");
        }
        catch (ArgumentException)
        {
            Console.WriteLine("Error: path is a zero-length string,
 contains only white space, or contains one or more invalid characters");
        }
        catch (PathTooLongException)
        {
            Console.WriteLine("Error: The specified path, file name, or both
 exceed the system-defined maximum length. For example, on Windows-based platforms,
 paths must be less than 248 characters, and file names must be less than 260 characters.");
        }
        catch (DirectoryNotFoundException)
        {
            Console.WriteLine("Error: The specified path is invalid, such as
 being on an unmapped drive.");
        }
        catch (IOException)
        {
            Console.WriteLine("Error: An I/O error occurred while
 opening the file.");
        }
        catch (UnauthorizedAccessException)
        {
            Console.WriteLine("Error: path specified a file that is read-only,
 the path is a directory, or caller does not have the required permissions.");
        }
        catch (IndexOutOfRangeException)
        {
            Console.WriteLine("Error: You must provide parameters for
 MyGZIP.");
        }
    }
    public static void Main(string[]
 args)
    {
        string usageText = "Usage: MYGZIP <inputfilename>";
        //If no file name is specified, write usage text.
        if (args.Length == 0)
        {
            Console.WriteLine(usageText);
        }
        else
        {
            if (File.Exists(args[0]))
                GZipCompressDecompress(args[0]);
        }
    }
}
    
#using <System.dll>

using namespace System;
using namespace System::IO;
using namespace System::IO::Compression;
int ReadAllBytesFromStream( Stream^ stream, array<Byte>^buffer
 )
{
   
   // Use this method is used to read all bytes from a stream.
   int offset = 0;
   int totalCount = 0;
   for ( ; ;  )
   {
      int bytesRead = stream->Read( buffer, offset, 100 );
      if ( bytesRead == 0 )
      {
         break;
      }

      offset += bytesRead;
      totalCount += bytesRead;

   }
   return totalCount;
}

bool CompareData( array<Byte>^buf1, int
 len1, array<Byte>^buf2, int len2 )
{
   
   // Use this method to compare data from two different buffers.
   if ( len1 != len2 )
   {
      Console::WriteLine( "Number of bytes in two buffer
 are different {0}:{1}", len1, len2 );
      return false;
   }

   for ( int i = 0; i < len1; i++ )
   {
      if ( buf1[ i ] != buf2[ i ] )
      {
         Console::WriteLine( "byte {0} is different {1}|{2}", i, buf1[
 i ], buf2[ i ] );
         return false;
      }

   }
   Console::WriteLine( "All bytes compare." );
   return true;
}

void GZipCompressDecompress( String^ filename )
{
   Console::WriteLine( "Test compression and decompression on file {0}",
 filename );
   FileStream^ infile;
   try
   {
      
      // Open the file as a FileStream object.
      infile = gcnew FileStream( filename,FileMode::Open,FileAccess::Read,FileShare::Read
 );
      array<Byte>^buffer = gcnew array<Byte>((int)infile->Length);
      
      // Read the file to ensure it is readable.
      int count = infile->Read( buffer, 0, buffer->Length
 );
      if ( count != buffer->Length )
      {
         infile->Close();
         Console::WriteLine( "Test Failed: Unable to read data from file"
 );
         return;
      }
      infile->Close();
      MemoryStream^ ms = gcnew MemoryStream;
      
      // Use the newly created memory stream for the compressed data.
      GZipStream ^ compressedzipStream = gcnew GZipStream( ms,CompressionMode::Compress,true
 );
      Console::WriteLine( "Compression" );
      compressedzipStream->Write( buffer, 0, buffer->Length );
      
      // Close the stream.
      compressedzipStream->Close();
      Console::WriteLine( "Original size: {0}, Compressed size: {1}", buffer->Length,
 ms->Length );
      
      // Reset the memory stream position to begin decompression.
      ms->Position = 0;
      GZipStream ^ zipStream = gcnew GZipStream( ms,CompressionMode::Decompress );
      Console::WriteLine( "Decompression" );
      array<Byte>^decompressedBuffer = gcnew array<Byte>(buffer->Length
 + 100);
      
      // Use the ReadAllBytesFromStream to read the stream.
      int totalCount = ReadAllBytesFromStream( zipStream, decompressedBuffer
 );
      Console::WriteLine( "Decompressed {0} bytes", totalCount );
      if (  !CompareData( buffer, buffer->Length, decompressedBuffer,
 totalCount ) )
      {
         Console::WriteLine( "Error. The two buffers did not compare."
 );
      }
      zipStream->Close();
   }
   catch ( InvalidDataException ^ ) 
   {
      Console::WriteLine( "Error: The file being read contains invalid data."
 );
   }
   catch ( FileNotFoundException^ ) 
   {
      Console::WriteLine( "Error:The file specified was not found." );
   }
   catch ( ArgumentException^ ) 
   {
      Console::WriteLine( "Error: path is a zero-length string,
 contains only white space, or contains one or more invalid characters" );
   }
   catch ( PathTooLongException^ ) 
   {
      Console::WriteLine( "Error: The specified path, file name, or both exceed
 the system-defined maximum length."
      " For example, on Windows-based platforms, paths must be less than 248
 characters, and file names must be less than 260 characters." );
   }
   catch ( DirectoryNotFoundException^ ) 
   {
      Console::WriteLine( "Error: The specified path is invalid, such as being
 on an unmapped drive." );
   }
   catch ( IOException^ ) 
   {
      Console::WriteLine( "Error: An I/O error occurred while
 opening the file." );
   }
   catch ( UnauthorizedAccessException^ ) 
   {
      Console::WriteLine( "Error: path specified a file that is read-only, the
 path is a directory, or caller does not have the required permissions." );
   }
   catch ( IndexOutOfRangeException^ ) 
   {
      Console::WriteLine( "Error: You must provide parameters for
 MyGZIP." );
   }

}

int main()
{
   array<String^>^args = Environment::GetCommandLineArgs();
   String^ usageText = "Usage: MYGZIP <inputfilename>";
   
   //If no file name is specified, write usage text.
   if ( args->Length == 1 )
   {
      Console::WriteLine( usageText );
   }
   else
   {
      if ( File::Exists( args[ 1 ] ) )
            GZipCompressDecompress( args[ 1 ] );
   }
}

import System.*;
import System.IO.*;
import System.IO.Compression.*;

public class GZipTest
{
    public static int ReadAllBytesFromStream(Stream
 stream, ubyte buffer[])
    {
        // Use this method is used to read all bytes from a stream.
        int offSet = 0;
        int totalCount = 0;
        while (true) {
            int bytesRead = stream.Read(buffer, offSet, 100);
            if (bytesRead == 0) {
                break;
            }
            offSet += bytesRead;
            totalCount += bytesRead;
        }
        return totalCount;
    } //ReadAllBytesFromStream

    public static boolean CompareData(ubyte
 buf1[], int len1, 
        ubyte buf2[], int len2)
    {
        // Use this method to compare data from two different buffers.
        if (len1 != len2) {
            Console.WriteLine("Number of bytes in two buffer
 are "
                + "different {0}:{1}", System.Convert.ToString(len1), 
                System.Convert.ToString(len2));
            return false;
        }
        for (int i = 0; i < len1; i++) {
            if (!(buf1.get_Item(i).Equals(buf2.get_Item(i))))
 {
                Console.WriteLine("byte {0} is different {1}|{2}", 
                    System.Convert.ToString(i), 
                    System.Convert.ToString(buf1.get_Item(i)), 
                    System.Convert.ToString(buf2.get_Item(i)));
                return false;
            }
        }
        Console.WriteLine("All bytes compare.");
        return true;
    } //CompareData

    public static void GZipCompressDecompress(String
 fileName)
    {
        Console.WriteLine("Test compression and decompression on file {0}"
,
            fileName);
        FileStream inFile;
        try {
            // Open the file as a FileStream object.
            inFile = new FileStream(fileName, FileMode.Open, 
                FileAccess.Read, FileShare.Read);
            ubyte buffer[] = new ubyte[(ubyte)inFile.get_Length()];

            // Read the file to ensure it is readable.
            int count = inFile.Read(buffer, 0, buffer.length);
            if (count != buffer.length) {
                inFile.Close();
                Console.WriteLine("Test Failed: Unable to read data from file");
                return;
            }
            inFile.Close();
            MemoryStream ms = new MemoryStream();

            // Use the newly created memory stream for the compressed
 data.
            GZipStream compressedZipStream = 
                new GZipStream(ms, CompressionMode.Compress, true);
            Console.WriteLine("Compression");
            compressedZipStream.Write(buffer, 0, buffer.length);

            // Close the stream.
            compressedZipStream.Close();
            Console.WriteLine("Original size: {0}, Compressed size: {1}",
 
                System.Convert.ToString(buffer.length), 
                System.Convert.ToString(ms.get_Length()));

            // Reset the memory stream position to begin decompression.
            ms.set_Position(0);
            GZipStream zipStream = 
                new GZipStream(ms, CompressionMode.Decompress);
            Console.WriteLine("Decompression");
            ubyte decompressedBuffer[] = new ubyte[buffer.length
 + 100];

            // Use the ReadAllBytesFromStream to read the stream.
            int totalCount = GZipTest.ReadAllBytesFromStream(zipStream,
 
                decompressedBuffer);
            Console.WriteLine("Decompressed {0} bytes", 
                System.Convert.ToString(totalCount));
            if (!(GZipTest.CompareData(buffer, buffer.length,
 
                decompressedBuffer, totalCount))) {
                Console.WriteLine("Error. The two buffers did not compare.");
            }
            zipStream.Close();
        } 
        catch (InvalidDataException exp) {
            Console.WriteLine("Error: The file being read contains"
                + " invalid data.");
        }
        catch (FileNotFoundException exp) {
            Console.WriteLine("Error:The file specified was not found.");
        }
        catch (ArgumentException exp) {
            Console.WriteLine("Error: path is a zero-length string,
 contains "
                + "only white space, or contains one or more invalid characters");
        }
        catch (PathTooLongException exp) {
            Console.WriteLine("Error: The specified path, file name, or both
 "
                + "exceed the system-defined maximum length. For example, on"
                + " Windows-based platforms, paths must be less than 248 "
                + "characters, and file names must be less than 260 characters.");
        }
        catch (DirectoryNotFoundException exp) {
            Console.WriteLine("Error: The specified path is invalid, such"
                + " as being on an unmapped drive.");
        }
        catch (IOException exp) {
            Console.WriteLine("Error: An I/O error occurred while
 "
                + "opening the file.");
        }
        catch (UnauthorizedAccessException exp) {
            Console.WriteLine("Error: path specified a file that is read-only
,"
                + " the path is a directory, or caller does not have"
                + " the required permissions.");
        }
        catch (IndexOutOfRangeException exp) {
            Console.WriteLine("Error: You must provide parameters for
 MyGZIP.");
        }
    } //GZipCompressDecompress

    public static void main(String[]
 args)
    {
        String usageText = "Usage: MYGZIP <inputfilename>";

        //If no file name is specified, write usage text.
        if (args.length == 0) {
            Console.WriteLine(usageText);
        }
        else {
            if (File.Exists(args[0])) {
                GZipCompressDecompress(args[0]);
            }
        }
    } //main
} //GZipTest
継承階層継承階層
System.Object
   System.MarshalByRefObject
     System.IO.Stream
      System.IO.Compression.GZipStream
スレッド セーフスレッド セーフ
この型の public static (Visual Basic では Shared) メンバはすべて、スレッド セーフです。インスタンス メンバ場合は、スレッド セーフであるとは限りません。
プラットフォームプラットフォーム
バージョン情報バージョン情報
参照参照
関連項目
GZipStream メンバ
System.IO.Compression 名前空間

GZipStream コンストラクタ (Stream, CompressionMode, Boolean)

メモ : このコンストラクタは、.NET Framework version 2.0新しく追加されたものです。

指定したストリームCompressionMode 値、およびストリーム開いたままにしておくかどうか指定する値を使用して、GZipStream クラス新しインスタンス初期化します。

名前空間: System.IO.Compression
アセンブリ: System (system.dll 内)
構文構文

Public Sub New ( _
    stream As Stream, _
    mode As CompressionMode, _
    leaveOpen As Boolean _
)
Dim stream As Stream
Dim mode As CompressionMode
Dim leaveOpen As Boolean

Dim instance As New GZipStream(stream,
 mode, leaveOpen)
public GZipStream (
    Stream stream,
    CompressionMode mode,
    bool leaveOpen
)
public:
GZipStream (
    Stream^ stream, 
    CompressionMode mode, 
    bool leaveOpen
)
public GZipStream (
    Stream stream, 
    CompressionMode mode, 
    boolean leaveOpen
)
public function GZipStream (
    stream : Stream, 
    mode : CompressionMode, 
    leaveOpen : boolean
)

パラメータ

stream

圧縮または圧縮解除するストリーム

mode

実行するアクションを示す CompressionMode 値の 1 つ

leaveOpen

ストリーム開いたままにしておく場合trueそれ以外場合false

例外例外
例外種類条件

ArgumentNullException

streamnull 参照 (Visual Basic では Nothing) です。

InvalidOperationException

streamアクセス権ReadOnly で、mode 値が Compress です。

ArgumentException

mode有効な CompressionMode 値ではありません。

または

CompressionModeCompress で、CanWrite が false です。

または

CompressionModeDecompress で、CanWritefalse です。

解説解説
使用例使用例

GZipStream クラス使用してファイル圧縮および圧縮解除実行するコード例次に示します

Imports System
Imports System.IO
Imports System.IO.Compression



Public Class GZipTest
    Shared msg As String
   Public Shared Function
 ReadAllBytesFromStream(stream As Stream, buffer() As
 Byte) As Integer
      ' Use this method is used to read all bytes from a stream.
      Dim offset As Integer
 = 0
      Dim totalCount As Integer
 = 0
      While True
         Dim bytesRead As Integer
 = stream.Read(buffer, offset, 100)
         If bytesRead = 0 Then
            Exit While
         End If
         offset += bytesRead
         totalCount += bytesRead
      End While
      Return totalCount
   End Function 'ReadAllBytesFromStream
   
   
   Public Shared Function
 CompareData(buf1() As Byte, len1 As
 Integer, buf2() As Byte, len2 As Integer) As Boolean
      ' Use this method to compare data from two different buffers.
        If len1 <> len2 Then
            msg = "Number of bytes in two buffer are different"
 & len1 & ":" & len2
            MsgBox(msg)
            Return False
        End If
      
      Dim i As Integer
      For i = 0 To len1 - 1
         If buf1(i) <> buf2(i) Then
                msg = "byte " & i & "
 is different " & buf1(i) & "|"
 & buf2(i)
                MsgBox(msg)
                Return False
         End If
        Next i
        msg = "All bytes compare."
        MsgBox(msg)
        Return True
   End Function 'CompareData
   
   
   Public Shared Sub GZipCompressDecompress(filename
 As String)
        msg = "Test compression and decompression on file "
 & filename
        MsgBox(msg)

        Dim infile As FileStream
      Try
         ' Open the file as a FileStream object.
         infile = New FileStream(filename, FileMode.Open, FileAccess.Read,
 FileShare.Read)
            Dim buffer(infile.Length - 1) As
 Byte
         ' Read the file to ensure it is readable.
            Dim count As Integer
 = infile.Read(buffer, 0, buffer.Length)
         If count <> buffer.Length Then
                infile.Close()
                msg = "Test Failed: Unable to read data from file"
                MsgBox(msg)
                Return
         End If
         infile.Close()
         Dim ms As New MemoryStream()
         ' Use the newly created memory stream for the compressed data.
         Dim compressedzipStream As New
 GZipStream(ms, CompressionMode.Compress, True)
         compressedzipStream.Write(buffer, 0, buffer.Length)
         ' Close the stream.
            compressedzipStream.Close()

            msg = "Original size: " & buffer.Length
 & ", Compressed size: " & ms.Length
            MsgBox(msg)

         ' Reset the memory stream position to begin decompression.
         ms.Position = 0
         Dim zipStream As New
 GZipStream(ms, CompressionMode.Decompress)
         Dim decompressedBuffer(buffer.Length + 100) As
 Byte
         ' Use the ReadAllBytesFromStream to read the stream.
         Dim totalCount As Integer
 = GZipTest.ReadAllBytesFromStream(zipStream, decompressedBuffer)
            msg = "Decompressed " & totalCount
 & " bytes"
            MsgBox(msg)

         If Not GZipTest.CompareData(buffer,
 buffer.Length, decompressedBuffer, totalCount) Then
                msg = "Error. The two buffers did not compare."
                MsgBox(msg)

         End If
         zipStream.Close()
        Catch e As Exception
            msg = "Error: The file being read contains invalid
 data."
            MsgBox(msg)
        End Try

   End Sub 'GZipCompressDecompress
   
    Public Shared Sub Main(ByVal
 args() As String)
        Dim usageText As String
 = "Usage: GZIPTEST <inputfilename>"
        'If no file name is specified, write usage text.
        If args.Length = 0 Then
            Console.WriteLine(usageText)
        Else
            If File.Exists(args(0)) Then
                GZipCompressDecompress(args(0))
            End If
        End If
    End Sub 'Main
End Class 'GZipTest 
using System;
using System.IO;
using System.IO.Compression;

public class GZipTest
{
    public static int ReadAllBytesFromStream(Stream
 stream, byte[] buffer) 
    {
    // Use this method is used to read all bytes from a stream.
    int offset = 0;
    int totalCount = 0;
        while (true) 
        {
        int bytesRead = stream.Read(buffer, offset, 100); 
            if ( bytesRead == 0) 
            {
            break; 
            }
    offset += bytesRead;
    totalCount += bytesRead; 
        }
    return totalCount;
    } 

    public static bool CompareData(byte[]
 buf1, int len1, byte[] buf2, int len2) 
    {
        // Use this method to compare data from two different buffers.
        if (len1 != len2) 
        { 
        Console.WriteLine("Number of bytes in two buffer
 are different {0}:{1}", len1, len2);
        return false;
        }

        for ( int i= 0; i< len1; i++) 
        {
            if ( buf1[i] != buf2[i]) 
            {
            Console.WriteLine("byte {0} is different {1}|{2}", i, buf1[i],
 buf2[i]);
            return false;
            }
        }
    Console.WriteLine("All bytes compare.");
    return true; 
    }

    public static void GZipCompressDecompress(string
 filename)
    {
    Console.WriteLine("Test compression and decompression on file {0}",
 filename);
    FileStream infile;
        try
        {
        // Open the file as a FileStream object.
        infile = new FileStream(filename, FileMode.Open, FileAccess.Read,
 FileShare.Read);
        byte[] buffer = new byte[infile.Length];
        // Read the file to ensure it is readable.
        int count = infile.Read(buffer, 0, buffer.Length);
            if ( count != buffer.Length) 
            {
            infile.Close();
            Console.WriteLine("Test Failed: Unable to read data from file");
 
            return;
            }
        infile.Close();
        MemoryStream ms = new MemoryStream();
        // Use the newly created memory stream for the compressed data.
        GZipStream compressedzipStream = new GZipStream(ms , CompressionMode.Compress,
 true);
        Console.WriteLine("Compression");
        compressedzipStream.Write(buffer, 0, buffer.Length);
        // Close the stream.
        compressedzipStream.Close();
        Console.WriteLine("Original size: {0}, Compressed size: {1}", buffer.Length,
 ms.Length);

        // Reset the memory stream position to begin decompression.
        ms.Position = 0;
        GZipStream zipStream = new GZipStream(ms, CompressionMode.Decompress);
        Console.WriteLine("Decompression");
        byte[] decompressedBuffer = new byte[buffer.Length + 100];
        // Use the ReadAllBytesFromStream to read the stream.
        int totalCount = GZipTest.ReadAllBytesFromStream(zipStream,
 decompressedBuffer);
        Console.WriteLine("Decompressed {0} bytes", totalCount);

        if( !GZipTest.CompareData(buffer, buffer.Length, decompressedBuffer,
 totalCount) ) 
        {
        Console.WriteLine("Error. The two buffers did not compare.");
        }
    zipStream.Close(); 
        } // end try
        catch (InvalidDataException)
        {
            Console.WriteLine("Error: The file being read contains invalid data.");
        }
        catch (FileNotFoundException)
        {
            Console.WriteLine("Error:The file specified was not found.");
        }
        catch (ArgumentException)
        {
            Console.WriteLine("Error: path is a zero-length string,
 contains only white space, or contains one or more invalid characters");
        }
        catch (PathTooLongException)
        {
            Console.WriteLine("Error: The specified path, file name, or both
 exceed the system-defined maximum length. For example, on Windows-based platforms,
 paths must be less than 248 characters, and file names must be less than 260 characters.");
        }
        catch (DirectoryNotFoundException)
        {
            Console.WriteLine("Error: The specified path is invalid, such as
 being on an unmapped drive.");
        }
        catch (IOException)
        {
            Console.WriteLine("Error: An I/O error occurred while
 opening the file.");
        }
        catch (UnauthorizedAccessException)
        {
            Console.WriteLine("Error: path specified a file that is read-only,
 the path is a directory, or caller does not have the required permissions.");
        }
        catch (IndexOutOfRangeException)
        {
            Console.WriteLine("Error: You must provide parameters for
 MyGZIP.");
        }
    }
    public static void Main(string[]
 args)
    {
        string usageText = "Usage: MYGZIP <inputfilename>";
        //If no file name is specified, write usage text.
        if (args.Length == 0)
        {
            Console.WriteLine(usageText);
        }
        else
        {
            if (File.Exists(args[0]))
                GZipCompressDecompress(args[0]);
        }
    }
}
    
#using <System.dll>

using namespace System;
using namespace System::IO;
using namespace System::IO::Compression;
int ReadAllBytesFromStream( Stream^ stream, array<Byte>^buffer
 )
{
   
   // Use this method is used to read all bytes from a stream.
   int offset = 0;
   int totalCount = 0;
   for ( ; ;  )
   {
      int bytesRead = stream->Read( buffer, offset, 100 );
      if ( bytesRead == 0 )
      {
         break;
      }

      offset += bytesRead;
      totalCount += bytesRead;

   }
   return totalCount;
}

bool CompareData( array<Byte>^buf1, int
 len1, array<Byte>^buf2, int len2 )
{
   
   // Use this method to compare data from two different buffers.
   if ( len1 != len2 )
   {
      Console::WriteLine( "Number of bytes in two buffer
 are different {0}:{1}", len1, len2 );
      return false;
   }

   for ( int i = 0; i < len1; i++ )
   {
      if ( buf1[ i ] != buf2[ i ] )
      {
         Console::WriteLine( "byte {0} is different {1}|{2}", i, buf1[
 i ], buf2[ i ] );
         return false;
      }

   }
   Console::WriteLine( "All bytes compare." );
   return true;
}

void GZipCompressDecompress( String^ filename )
{
   Console::WriteLine( "Test compression and decompression on file {0}",
 filename );
   FileStream^ infile;
   try
   {
      
      // Open the file as a FileStream object.
      infile = gcnew FileStream( filename,FileMode::Open,FileAccess::Read,FileShare::Read
 );
      array<Byte>^buffer = gcnew array<Byte>((int)infile->Length);
      
      // Read the file to ensure it is readable.
      int count = infile->Read( buffer, 0, buffer->Length
 );
      if ( count != buffer->Length )
      {
         infile->Close();
         Console::WriteLine( "Test Failed: Unable to read data from file"
 );
         return;
      }
      infile->Close();
      MemoryStream^ ms = gcnew MemoryStream;
      
      // Use the newly created memory stream for the compressed data.
      GZipStream ^ compressedzipStream = gcnew GZipStream( ms,CompressionMode::Compress,true
 );
      Console::WriteLine( "Compression" );
      compressedzipStream->Write( buffer, 0, buffer->Length );
      
      // Close the stream.
      compressedzipStream->Close();
      Console::WriteLine( "Original size: {0}, Compressed size: {1}", buffer->Length,
 ms->Length );
      
      // Reset the memory stream position to begin decompression.
      ms->Position = 0;
      GZipStream ^ zipStream = gcnew GZipStream( ms,CompressionMode::Decompress );
      Console::WriteLine( "Decompression" );
      array<Byte>^decompressedBuffer = gcnew array<Byte>(buffer->Length
 + 100);
      
      // Use the ReadAllBytesFromStream to read the stream.
      int totalCount = ReadAllBytesFromStream( zipStream, decompressedBuffer
 );
      Console::WriteLine( "Decompressed {0} bytes", totalCount );
      if (  !CompareData( buffer, buffer->Length, decompressedBuffer,
 totalCount ) )
      {
         Console::WriteLine( "Error. The two buffers did not compare."
 );
      }
      zipStream->Close();
   }
   catch ( InvalidDataException ^ ) 
   {
      Console::WriteLine( "Error: The file being read contains invalid data."
 );
   }
   catch ( FileNotFoundException^ ) 
   {
      Console::WriteLine( "Error:The file specified was not found." );
   }
   catch ( ArgumentException^ ) 
   {
      Console::WriteLine( "Error: path is a zero-length string,
 contains only white space, or contains one or more invalid characters" );
   }
   catch ( PathTooLongException^ ) 
   {
      Console::WriteLine( "Error: The specified path, file name, or both exceed
 the system-defined maximum length."
      " For example, on Windows-based platforms, paths must be less than 248
 characters, and file names must be less than 260 characters." );
   }
   catch ( DirectoryNotFoundException^ ) 
   {
      Console::WriteLine( "Error: The specified path is invalid, such as being
 on an unmapped drive." );
   }
   catch ( IOException^ ) 
   {
      Console::WriteLine( "Error: An I/O error occurred while
 opening the file." );
   }
   catch ( UnauthorizedAccessException^ ) 
   {
      Console::WriteLine( "Error: path specified a file that is read-only, the
 path is a directory, or caller does not have the required permissions." );
   }
   catch ( IndexOutOfRangeException^ ) 
   {
      Console::WriteLine( "Error: You must provide parameters for
 MyGZIP." );
   }

}

int main()
{
   array<String^>^args = Environment::GetCommandLineArgs();
   String^ usageText = "Usage: MYGZIP <inputfilename>";
   
   //If no file name is specified, write usage text.
   if ( args->Length == 1 )
   {
      Console::WriteLine( usageText );
   }
   else
   {
      if ( File::Exists( args[ 1 ] ) )
            GZipCompressDecompress( args[ 1 ] );
   }
}

import System.*;
import System.IO.*;
import System.IO.Compression.*;

public class GZipTest
{
    public static int ReadAllBytesFromStream(Stream
 stream, ubyte buffer[])
    {
        // Use this method is used to read all bytes from a stream.
        int offSet = 0;
        int totalCount = 0;
        while (true) {
            int bytesRead = stream.Read(buffer, offSet, 100);
            if (bytesRead == 0) {
                break;
            }
            offSet += bytesRead;
            totalCount += bytesRead;
        }
        return totalCount;
    } //ReadAllBytesFromStream

    public static boolean CompareData(ubyte
 buf1[], int len1, 
        ubyte buf2[], int len2)
    {
        // Use this method to compare data from two different buffers.
        if (len1 != len2) {
            Console.WriteLine("Number of bytes in two buffer
 are "
                + "different {0}:{1}", System.Convert.ToString(len1), 
                System.Convert.ToString(len2));
            return false;
        }
        for (int i = 0; i < len1; i++) {
            if (!(buf1.get_Item(i).Equals(buf2.get_Item(i))))
 {
                Console.WriteLine("byte {0} is different {1}|{2}", 
                    System.Convert.ToString(i), 
                    System.Convert.ToString(buf1.get_Item(i)), 
                    System.Convert.ToString(buf2.get_Item(i)));
                return false;
            }
        }
        Console.WriteLine("All bytes compare.");
        return true;
    } //CompareData

    public static void GZipCompressDecompress(String
 fileName)
    {
        Console.WriteLine("Test compression and decompression on file {0}"
,
            fileName);
        FileStream inFile;
        try {
            // Open the file as a FileStream object.
            inFile = new FileStream(fileName, FileMode.Open, 
                FileAccess.Read, FileShare.Read);
            ubyte buffer[] = new ubyte[(ubyte)inFile.get_Length()];

            // Read the file to ensure it is readable.
            int count = inFile.Read(buffer, 0, buffer.length);
            if (count != buffer.length) {
                inFile.Close();
                Console.WriteLine("Test Failed: Unable to read data from file");
                return;
            }
            inFile.Close();
            MemoryStream ms = new MemoryStream();

            // Use the newly created memory stream for the compressed
 data.
            GZipStream compressedZipStream = 
                new GZipStream(ms, CompressionMode.Compress, true);
            Console.WriteLine("Compression");
            compressedZipStream.Write(buffer, 0, buffer.length);

            // Close the stream.
            compressedZipStream.Close();
            Console.WriteLine("Original size: {0}, Compressed size: {1}",
 
                System.Convert.ToString(buffer.length), 
                System.Convert.ToString(ms.get_Length()));

            // Reset the memory stream position to begin decompression.
            ms.set_Position(0);
            GZipStream zipStream = 
                new GZipStream(ms, CompressionMode.Decompress);
            Console.WriteLine("Decompression");
            ubyte decompressedBuffer[] = new ubyte[buffer.length
 + 100];

            // Use the ReadAllBytesFromStream to read the stream.
            int totalCount = GZipTest.ReadAllBytesFromStream(zipStream,
 
                decompressedBuffer);
            Console.WriteLine("Decompressed {0} bytes", 
                System.Convert.ToString(totalCount));
            if (!(GZipTest.CompareData(buffer, buffer.length,
 
                decompressedBuffer, totalCount))) {
                Console.WriteLine("Error. The two buffers did not compare.");
            }
            zipStream.Close();
        } 
        catch (InvalidDataException exp) {
            Console.WriteLine("Error: The file being read contains"
                + " invalid data.");
        }
        catch (FileNotFoundException exp) {
            Console.WriteLine("Error:The file specified was not found.");
        }
        catch (ArgumentException exp) {
            Console.WriteLine("Error: path is a zero-length string,
 contains "
                + "only white space, or contains one or more invalid characters");
        }
        catch (PathTooLongException exp) {
            Console.WriteLine("Error: The specified path, file name, or both
 "
                + "exceed the system-defined maximum length. For example, on"
                + " Windows-based platforms, paths must be less than 248 "
                + "characters, and file names must be less than 260 characters.");
        }
        catch (DirectoryNotFoundException exp) {
            Console.WriteLine("Error: The specified path is invalid, such"
                + " as being on an unmapped drive.");
        }
        catch (IOException exp) {
            Console.WriteLine("Error: An I/O error occurred while
 "
                + "opening the file.");
        }
        catch (UnauthorizedAccessException exp) {
            Console.WriteLine("Error: path specified a file that is read-only
,"
                + " the path is a directory, or caller does not have"
                + " the required permissions.");
        }
        catch (IndexOutOfRangeException exp) {
            Console.WriteLine("Error: You must provide parameters for
 MyGZIP.");
        }
    } //GZipCompressDecompress

    public static void main(String[]
 args)
    {
        String usageText = "Usage: MYGZIP <inputfilename>";

        //If no file name is specified, write usage text.
        if (args.length == 0) {
            Console.WriteLine(usageText);
        }
        else {
            if (File.Exists(args[0])) {
                GZipCompressDecompress(args[0]);
            }
        }
    } //main
} //GZipTest
プラットフォームプラットフォーム
バージョン情報バージョン情報
参照参照
関連項目
GZipStream クラス
GZipStream メンバ
System.IO.Compression 名前空間

GZipStream コンストラクタ (Stream, CompressionMode)

メモ : このコンストラクタは、.NET Framework version 2.0新しく追加されたものです。

指定したストリームCompressionMode 値を使用して、GZipStream クラス新しインスタンス初期化します。

名前空間: System.IO.Compression
アセンブリ: System (system.dll 内)
構文構文

Public Sub New ( _
    stream As Stream, _
    mode As CompressionMode _
)
Dim stream As Stream
Dim mode As CompressionMode

Dim instance As New GZipStream(stream,
 mode)
public GZipStream (
    Stream stream,
    CompressionMode mode
)
public:
GZipStream (
    Stream^ stream, 
    CompressionMode mode
)
public GZipStream (
    Stream stream, 
    CompressionMode mode
)
public function GZipStream (
    stream : Stream, 
    mode : CompressionMode
)

パラメータ

stream

圧縮または圧縮解除するストリーム

mode

実行するアクションを示す CompressionMode 値の 1 つ

例外例外
例外種類条件

ArgumentNullException

streamnull 参照 (Visual Basic では Nothing) です。

InvalidOperationException

streamアクセス権ReadOnly で、mode 値が Compress です。

ArgumentException

mode有効な CompressionMode 列挙値ではありません。

または

CompressionModeCompress で、CanWrite が false です。

または

CompressionModeDecompress で、CanWritefalse です。

解説解説
使用例使用例

GZipStream クラス使用してファイル圧縮および圧縮解除実行するコード例次に示します

Imports System
Imports System.IO
Imports System.IO.Compression



Public Class GZipTest
    Shared msg As String
   Public Shared Function
 ReadAllBytesFromStream(stream As Stream, buffer() As
 Byte) As Integer
      ' Use this method is used to read all bytes from a stream.
      Dim offset As Integer
 = 0
      Dim totalCount As Integer
 = 0
      While True
         Dim bytesRead As Integer
 = stream.Read(buffer, offset, 100)
         If bytesRead = 0 Then
            Exit While
         End If
         offset += bytesRead
         totalCount += bytesRead
      End While
      Return totalCount
   End Function 'ReadAllBytesFromStream
   
   
   Public Shared Function
 CompareData(buf1() As Byte, len1 As
 Integer, buf2() As Byte, len2 As Integer) As Boolean
      ' Use this method to compare data from two different buffers.
        If len1 <> len2 Then
            msg = "Number of bytes in two buffer are different"
 & len1 & ":" & len2
            MsgBox(msg)
            Return False
        End If
      
      Dim i As Integer
      For i = 0 To len1 - 1
         If buf1(i) <> buf2(i) Then
                msg = "byte " & i & "
 is different " & buf1(i) & "|"
 & buf2(i)
                MsgBox(msg)
                Return False
         End If
        Next i
        msg = "All bytes compare."
        MsgBox(msg)
        Return True
   End Function 'CompareData
   
   
   Public Shared Sub GZipCompressDecompress(filename
 As String)
        msg = "Test compression and decompression on file "
 & filename
        MsgBox(msg)

        Dim infile As FileStream
      Try
         ' Open the file as a FileStream object.
         infile = New FileStream(filename, FileMode.Open, FileAccess.Read,
 FileShare.Read)
            Dim buffer(infile.Length - 1) As
 Byte
         ' Read the file to ensure it is readable.
            Dim count As Integer
 = infile.Read(buffer, 0, buffer.Length)
         If count <> buffer.Length Then
                infile.Close()
                msg = "Test Failed: Unable to read data from file"
                MsgBox(msg)
                Return
         End If
         infile.Close()
         Dim ms As New MemoryStream()
         ' Use the newly created memory stream for the compressed data.
         Dim compressedzipStream As New
 GZipStream(ms, CompressionMode.Compress, True)
         compressedzipStream.Write(buffer, 0, buffer.Length)
         ' Close the stream.
            compressedzipStream.Close()

            msg = "Original size: " & buffer.Length
 & ", Compressed size: " & ms.Length
            MsgBox(msg)

         ' Reset the memory stream position to begin decompression.
         ms.Position = 0
         Dim zipStream As New
 GZipStream(ms, CompressionMode.Decompress)
         Dim decompressedBuffer(buffer.Length + 100) As
 Byte
         ' Use the ReadAllBytesFromStream to read the stream.
         Dim totalCount As Integer
 = GZipTest.ReadAllBytesFromStream(zipStream, decompressedBuffer)
            msg = "Decompressed " & totalCount
 & " bytes"
            MsgBox(msg)

         If Not GZipTest.CompareData(buffer,
 buffer.Length, decompressedBuffer, totalCount) Then
                msg = "Error. The two buffers did not compare."
                MsgBox(msg)

         End If
         zipStream.Close()
        Catch e As Exception
            msg = "Error: The file being read contains invalid
 data."
            MsgBox(msg)
        End Try

   End Sub 'GZipCompressDecompress
   
    Public Shared Sub Main(ByVal
 args() As String)
        Dim usageText As String
 = "Usage: GZIPTEST <inputfilename>"
        'If no file name is specified, write usage text.
        If args.Length = 0 Then
            Console.WriteLine(usageText)
        Else
            If File.Exists(args(0)) Then
                GZipCompressDecompress(args(0))
            End If
        End If
    End Sub 'Main
End Class 'GZipTest 
using System;
using System.IO;
using System.IO.Compression;

public class GZipTest
{
    public static int ReadAllBytesFromStream(Stream
 stream, byte[] buffer) 
    {
    // Use this method is used to read all bytes from a stream.
    int offset = 0;
    int totalCount = 0;
        while (true) 
        {
        int bytesRead = stream.Read(buffer, offset, 100); 
            if ( bytesRead == 0) 
            {
            break; 
            }
    offset += bytesRead;
    totalCount += bytesRead; 
        }
    return totalCount;
    } 

    public static bool CompareData(byte[]
 buf1, int len1, byte[] buf2, int len2) 
    {
        // Use this method to compare data from two different buffers.
        if (len1 != len2) 
        { 
        Console.WriteLine("Number of bytes in two buffer
 are different {0}:{1}", len1, len2);
        return false;
        }

        for ( int i= 0; i< len1; i++) 
        {
            if ( buf1[i] != buf2[i]) 
            {
            Console.WriteLine("byte {0} is different {1}|{2}", i, buf1[i],
 buf2[i]);
            return false;
            }
        }
    Console.WriteLine("All bytes compare.");
    return true; 
    }

    public static void GZipCompressDecompress(string
 filename)
    {
    Console.WriteLine("Test compression and decompression on file {0}",
 filename);
    FileStream infile;
        try
        {
        // Open the file as a FileStream object.
        infile = new FileStream(filename, FileMode.Open, FileAccess.Read,
 FileShare.Read);
        byte[] buffer = new byte[infile.Length];
        // Read the file to ensure it is readable.
        int count = infile.Read(buffer, 0, buffer.Length);
            if ( count != buffer.Length) 
            {
            infile.Close();
            Console.WriteLine("Test Failed: Unable to read data from file");
 
            return;
            }
        infile.Close();
        MemoryStream ms = new MemoryStream();
        // Use the newly created memory stream for the compressed data.
        GZipStream compressedzipStream = new GZipStream(ms , CompressionMode.Compress,
 true);
        Console.WriteLine("Compression");
        compressedzipStream.Write(buffer, 0, buffer.Length);
        // Close the stream.
        compressedzipStream.Close();
        Console.WriteLine("Original size: {0}, Compressed size: {1}", buffer.Length,
 ms.Length);

        // Reset the memory stream position to begin decompression.
        ms.Position = 0;
        GZipStream zipStream = new GZipStream(ms, CompressionMode.Decompress);
        Console.WriteLine("Decompression");
        byte[] decompressedBuffer = new byte[buffer.Length + 100];
        // Use the ReadAllBytesFromStream to read the stream.
        int totalCount = GZipTest.ReadAllBytesFromStream(zipStream,
 decompressedBuffer);
        Console.WriteLine("Decompressed {0} bytes", totalCount);

        if( !GZipTest.CompareData(buffer, buffer.Length, decompressedBuffer,
 totalCount) ) 
        {
        Console.WriteLine("Error. The two buffers did not compare.");
        }
    zipStream.Close(); 
        } // end try
        catch (InvalidDataException)
        {
            Console.WriteLine("Error: The file being read contains invalid data.");
        }
        catch (FileNotFoundException)
        {
            Console.WriteLine("Error:The file specified was not found.");
        }
        catch (ArgumentException)
        {
            Console.WriteLine("Error: path is a zero-length string,
 contains only white space, or contains one or more invalid characters");
        }
        catch (PathTooLongException)
        {
            Console.WriteLine("Error: The specified path, file name, or both
 exceed the system-defined maximum length. For example, on Windows-based platforms,
 paths must be less than 248 characters, and file names must be less than 260 characters.");
        }
        catch (DirectoryNotFoundException)
        {
            Console.WriteLine("Error: The specified path is invalid, such as
 being on an unmapped drive.");
        }
        catch (IOException)
        {
            Console.WriteLine("Error: An I/O error occurred while
 opening the file.");
        }
        catch (UnauthorizedAccessException)
        {
            Console.WriteLine("Error: path specified a file that is read-only,
 the path is a directory, or caller does not have the required permissions.");
        }
        catch (IndexOutOfRangeException)
        {
            Console.WriteLine("Error: You must provide parameters for
 MyGZIP.");
        }
    }
    public static void Main(string[]
 args)
    {
        string usageText = "Usage: MYGZIP <inputfilename>";
        //If no file name is specified, write usage text.
        if (args.Length == 0)
        {
            Console.WriteLine(usageText);
        }
        else
        {
            if (File.Exists(args[0]))
                GZipCompressDecompress(args[0]);
        }
    }
}
    
#using <System.dll>

using namespace System;
using namespace System::IO;
using namespace System::IO::Compression;
int ReadAllBytesFromStream( Stream^ stream, array<Byte>^buffer
 )
{
   
   // Use this method is used to read all bytes from a stream.
   int offset = 0;
   int totalCount = 0;
   for ( ; ;  )
   {
      int bytesRead = stream->Read( buffer, offset, 100 );
      if ( bytesRead == 0 )
      {
         break;
      }

      offset += bytesRead;
      totalCount += bytesRead;

   }
   return totalCount;
}

bool CompareData( array<Byte>^buf1, int
 len1, array<Byte>^buf2, int len2 )
{
   
   // Use this method to compare data from two different buffers.
   if ( len1 != len2 )
   {
      Console::WriteLine( "Number of bytes in two buffer
 are different {0}:{1}", len1, len2 );
      return false;
   }

   for ( int i = 0; i < len1; i++ )
   {
      if ( buf1[ i ] != buf2[ i ] )
      {
         Console::WriteLine( "byte {0} is different {1}|{2}", i, buf1[
 i ], buf2[ i ] );
         return false;
      }

   }
   Console::WriteLine( "All bytes compare." );
   return true;
}

void GZipCompressDecompress( String^ filename )
{
   Console::WriteLine( "Test compression and decompression on file {0}",
 filename );
   FileStream^ infile;
   try
   {
      
      // Open the file as a FileStream object.
      infile = gcnew FileStream( filename,FileMode::Open,FileAccess::Read,FileShare::Read
 );
      array<Byte>^buffer = gcnew array<Byte>((int)infile->Length);
      
      // Read the file to ensure it is readable.
      int count = infile->Read( buffer, 0, buffer->Length
 );
      if ( count != buffer->Length )
      {
         infile->Close();
         Console::WriteLine( "Test Failed: Unable to read data from file"
 );
         return;
      }
      infile->Close();
      MemoryStream^ ms = gcnew MemoryStream;
      
      // Use the newly created memory stream for the compressed data.
      GZipStream ^ compressedzipStream = gcnew GZipStream( ms,CompressionMode::Compress,true
 );
      Console::WriteLine( "Compression" );
      compressedzipStream->Write( buffer, 0, buffer->Length );
      
      // Close the stream.
      compressedzipStream->Close();
      Console::WriteLine( "Original size: {0}, Compressed size: {1}", buffer->Length,
 ms->Length );
      
      // Reset the memory stream position to begin decompression.
      ms->Position = 0;
      GZipStream ^ zipStream = gcnew GZipStream( ms,CompressionMode::Decompress );
      Console::WriteLine( "Decompression" );
      array<Byte>^decompressedBuffer = gcnew array<Byte>(buffer->Length
 + 100);
      
      // Use the ReadAllBytesFromStream to read the stream.
      int totalCount = ReadAllBytesFromStream( zipStream, decompressedBuffer
 );
      Console::WriteLine( "Decompressed {0} bytes", totalCount );
      if (  !CompareData( buffer, buffer->Length, decompressedBuffer,
 totalCount ) )
      {
         Console::WriteLine( "Error. The two buffers did not compare."
 );
      }
      zipStream->Close();
   }
   catch ( InvalidDataException ^ ) 
   {
      Console::WriteLine( "Error: The file being read contains invalid data."
 );
   }
   catch ( FileNotFoundException^ ) 
   {
      Console::WriteLine( "Error:The file specified was not found." );
   }
   catch ( ArgumentException^ ) 
   {
      Console::WriteLine( "Error: path is a zero-length string,
 contains only white space, or contains one or more invalid characters" );
   }
   catch ( PathTooLongException^ ) 
   {
      Console::WriteLine( "Error: The specified path, file name, or both exceed
 the system-defined maximum length."
      " For example, on Windows-based platforms, paths must be less than 248
 characters, and file names must be less than 260 characters." );
   }
   catch ( DirectoryNotFoundException^ ) 
   {
      Console::WriteLine( "Error: The specified path is invalid, such as being
 on an unmapped drive." );
   }
   catch ( IOException^ ) 
   {
      Console::WriteLine( "Error: An I/O error occurred while
 opening the file." );
   }
   catch ( UnauthorizedAccessException^ ) 
   {
      Console::WriteLine( "Error: path specified a file that is read-only, the
 path is a directory, or caller does not have the required permissions." );
   }
   catch ( IndexOutOfRangeException^ ) 
   {
      Console::WriteLine( "Error: You must provide parameters for
 MyGZIP." );
   }

}

int main()
{
   array<String^>^args = Environment::GetCommandLineArgs();
   String^ usageText = "Usage: MYGZIP <inputfilename>";
   
   //If no file name is specified, write usage text.
   if ( args->Length == 1 )
   {
      Console::WriteLine( usageText );
   }
   else
   {
      if ( File::Exists( args[ 1 ] ) )
            GZipCompressDecompress( args[ 1 ] );
   }
}

import System.*;
import System.IO.*;
import System.IO.Compression.*;

public class GZipTest
{
    public static int ReadAllBytesFromStream(Stream
 stream, ubyte buffer[])
    {
        // Use this method is used to read all bytes from a stream.
        int offSet = 0;
        int totalCount = 0;
        while (true) {
            int bytesRead = stream.Read(buffer, offSet, 100);
            if (bytesRead == 0) {
                break;
            }
            offSet += bytesRead;
            totalCount += bytesRead;
        }
        return totalCount;
    } //ReadAllBytesFromStream

    public static boolean CompareData(ubyte
 buf1[], int len1, 
        ubyte buf2[], int len2)
    {
        // Use this method to compare data from two different buffers.
        if (len1 != len2) {
            Console.WriteLine("Number of bytes in two buffer
 are "
                + "different {0}:{1}", System.Convert.ToString(len1), 
                System.Convert.ToString(len2));
            return false;
        }
        for (int i = 0; i < len1; i++) {
            if (!(buf1.get_Item(i).Equals(buf2.get_Item(i))))
 {
                Console.WriteLine("byte {0} is different {1}|{2}", 
                    System.Convert.ToString(i), 
                    System.Convert.ToString(buf1.get_Item(i)), 
                    System.Convert.ToString(buf2.get_Item(i)));
                return false;
            }
        }
        Console.WriteLine("All bytes compare.");
        return true;
    } //CompareData

    public static void GZipCompressDecompress(String
 fileName)
    {
        Console.WriteLine("Test compression and decompression on file {0}"
,
            fileName);
        FileStream inFile;
        try {
            // Open the file as a FileStream object.
            inFile = new FileStream(fileName, FileMode.Open, 
                FileAccess.Read, FileShare.Read);
            ubyte buffer[] = new ubyte[(ubyte)inFile.get_Length()];

            // Read the file to ensure it is readable.
            int count = inFile.Read(buffer, 0, buffer.length);
            if (count != buffer.length) {
                inFile.Close();
                Console.WriteLine("Test Failed: Unable to read data from file");
                return;
            }
            inFile.Close();
            MemoryStream ms = new MemoryStream();

            // Use the newly created memory stream for the compressed
 data.
            GZipStream compressedZipStream = 
                new GZipStream(ms, CompressionMode.Compress, true);
            Console.WriteLine("Compression");
            compressedZipStream.Write(buffer, 0, buffer.length);

            // Close the stream.
            compressedZipStream.Close();
            Console.WriteLine("Original size: {0}, Compressed size: {1}",
 
                System.Convert.ToString(buffer.length), 
                System.Convert.ToString(ms.get_Length()));

            // Reset the memory stream position to begin decompression.
            ms.set_Position(0);
            GZipStream zipStream = 
                new GZipStream(ms, CompressionMode.Decompress);
            Console.WriteLine("Decompression");
            ubyte decompressedBuffer[] = new ubyte[buffer.length
 + 100];

            // Use the ReadAllBytesFromStream to read the stream.
            int totalCount = GZipTest.ReadAllBytesFromStream(zipStream,
 
                decompressedBuffer);
            Console.WriteLine("Decompressed {0} bytes", 
                System.Convert.ToString(totalCount));
            if (!(GZipTest.CompareData(buffer, buffer.length,
 
                decompressedBuffer, totalCount))) {
                Console.WriteLine("Error. The two buffers did not compare.");
            }
            zipStream.Close();
        } 
        catch (InvalidDataException exp) {
            Console.WriteLine("Error: The file being read contains"
                + " invalid data.");
        }
        catch (FileNotFoundException exp) {
            Console.WriteLine("Error:The file specified was not found.");
        }
        catch (ArgumentException exp) {
            Console.WriteLine("Error: path is a zero-length string,
 contains "
                + "only white space, or contains one or more invalid characters");
        }
        catch (PathTooLongException exp) {
            Console.WriteLine("Error: The specified path, file name, or both
 "
                + "exceed the system-defined maximum length. For example, on"
                + " Windows-based platforms, paths must be less than 248 "
                + "characters, and file names must be less than 260 characters.");
        }
        catch (DirectoryNotFoundException exp) {
            Console.WriteLine("Error: The specified path is invalid, such"
                + " as being on an unmapped drive.");
        }
        catch (IOException exp) {
            Console.WriteLine("Error: An I/O error occurred while
 "
                + "opening the file.");
        }
        catch (UnauthorizedAccessException exp) {
            Console.WriteLine("Error: path specified a file that is read-only
,"
                + " the path is a directory, or caller does not have"
                + " the required permissions.");
        }
        catch (IndexOutOfRangeException exp) {
            Console.WriteLine("Error: You must provide parameters for
 MyGZIP.");
        }
    } //GZipCompressDecompress

    public static void main(String[]
 args)
    {
        String usageText = "Usage: MYGZIP <inputfilename>";

        //If no file name is specified, write usage text.
        if (args.length == 0) {
            Console.WriteLine(usageText);
        }
        else {
            if (File.Exists(args[0])) {
                GZipCompressDecompress(args[0]);
            }
        }
    } //main
} //GZipTest
プラットフォームプラットフォーム
バージョン情報バージョン情報
参照参照
関連項目
GZipStream クラス
GZipStream メンバ
System.IO.Compression 名前空間

GZipStream コンストラクタ

GZipStream クラス新しインスタンス初期化します。

GZipStream クラス使用してサイズが 4 GB超えるファイル圧縮すると、例外発生します


オーバーロードの一覧オーバーロードの一覧
名前 説明
GZipStream (Stream, CompressionMode) 指定したストリームと CompressionMode 値を使用してGZipStream クラス新しインスタンス初期化します。
GZipStream (Stream, CompressionMode, Boolean) 指定したストリームCompressionMode 値、およびストリーム開いたままにしておくかどうか指定する値を使用してGZipStream クラス新しインスタンス初期化します。
参照参照

関連項目

GZipStream クラス
GZipStream メンバ
System.IO.Compression 名前空間

GZipStream プロパティ


パブリック プロパティパブリック プロパティ

参照参照

関連項目

GZipStream クラス
System.IO.Compression 名前空間

GZipStream メソッド


パブリック メソッドパブリック メソッド

( プロテクト メソッド参照)
  名前 説明
パブリック メソッド BeginRead オーバーライドされます非同期読み込み動作開始します
パブリック メソッド BeginWrite オーバーライドされます非同期書き込み操作開始します
パブリック メソッド Close  現在のストリーム閉じ現在のストリーム関連付けられているすべてのリソース (ソケットファイル ハンドルなど) を解放します。 ( Stream から継承されます。)
パブリック メソッド CreateObjRef  リモート オブジェクトとの通信使用するプロキシ生成必要な情報をすべて格納しているオブジェクト作成します。 ( MarshalByRefObject から継承されます。)
パブリック メソッド Dispose オーバーロードされます。  
パブリック メソッド EndRead オーバーライドされます保留中の非同期読み取り完了するまで待機します。
パブリック メソッド EndWrite オーバーライドされます非同期書き込み操作終了処理します
パブリック メソッド Equals  オーバーロードされます2 つObject インスタンス等しかどうか判断します。 ( Object から継承されます。)
パブリック メソッド Flush オーバーライドされます現在の GZipStream オブジェクト内部バッファ内容を、基になるストリームフラッシュます。
パブリック メソッド GetHashCode  特定の型のハッシュ関数として機能します。GetHashCode は、ハッシュ アルゴリズムや、ハッシュ テーブルのようなデータ構造での使用適してます。 ( Object から継承されます。)
パブリック メソッド GetLifetimeService  対象インスタンス有効期間ポリシー制御する現在の有効期間サービス オブジェクト取得します。 ( MarshalByRefObject から継承されます。)
パブリック メソッド GetType  現在のインスタンスType取得します。 ( Object から継承されます。)
パブリック メソッド InitializeLifetimeService  対象インスタンス有効期間ポリシー制御する有効期間サービス オブジェクト取得します。 ( MarshalByRefObject から継承されます。)
パブリック メソッド Read オーバーライドされます圧縮解除されたバイト数を、指定したバイト配列読み取ります。
パブリック メソッド ReadByte  ストリームから 1 バイト読み取りストリーム内の位置1 バイト進めますストリーム末尾場合は -1 を返します。 ( Stream から継承されます。)
パブリック メソッド ReferenceEquals  指定した複数Object インスタンス同一かどうか判断します。 ( Object から継承されます。)
パブリック メソッド Seek オーバーライドされます。 このプロパティサポートされていないため、常に NotSupportedException をスローます。
パブリック メソッド SetLength オーバーライドされます。 このプロパティサポートされていないため、常に NotSupportedExceptionスローます。
パブリック メソッド Synchronized  指定した Stream オブジェクトラップするスレッド セーフな (同期された) ラッパー作成します。 ( Stream から継承されます。)
パブリック メソッド ToString  現在の Object を表す String返します。 ( Object から継承されます。)
パブリック メソッド Write オーバーライドされます圧縮されたバイトを、指定したバイト配列から基になるストリーム書き込みます
パブリック メソッド WriteByte  ストリーム現在位置バイト書き込みストリーム位置1 バイトだけ進めます。 ( Stream から継承されます。)
プロテクト メソッドプロテクト メソッド
参照参照

関連項目

GZipStream クラス
System.IO.Compression 名前空間

GZipStream メンバ

ストリーム圧縮および圧縮解除実行するために使用するメソッドプロパティ提供します

GZipStream データ型公開されるメンバを以下の表に示します


パブリック コンストラクタパブリック コンストラクタ
パブリック プロパティパブリック プロパティ
パブリック メソッドパブリック メソッド
( プロテクト メソッド参照)
  名前 説明
パブリック メソッド BeginRead オーバーライドされます非同期読み込み動作開始します
パブリック メソッド BeginWrite オーバーライドされます非同期書き込み操作開始します
パブリック メソッド Close  現在のストリーム閉じ現在のストリーム関連付けられているすべてのリソース (ソケットファイル ハンドルなど) を解放します。 (Stream から継承されます。)
パブリック メソッド CreateObjRef  リモート オブジェクトとの通信使用するプロキシ生成必要な情報をすべて格納しているオブジェクト作成します。 (MarshalByRefObject から継承されます。)
パブリック メソッド Dispose オーバーロードされます。  
パブリック メソッド EndRead オーバーライドされます保留中の非同期読み取り完了するまで待機します。
パブリック メソッド EndWrite オーバーライドされます非同期書き込み操作終了処理します
パブリック メソッド Equals  オーバーロードされます2 つObject インスタンス等しかどうか判断します。 (Object から継承されます。)
パブリック メソッド Flush オーバーライドされます現在の GZipStream オブジェクト内部バッファ内容を、基になるストリームフラッシュます。
パブリック メソッド GetHashCode  特定の型のハッシュ関数として機能します。GetHashCode は、ハッシュ アルゴリズムや、ハッシュ テーブルのようなデータ構造での使用適してます。 (Object から継承されます。)
パブリック メソッド GetLifetimeService  対象インスタンス有効期間ポリシー制御する現在の有効期間サービス オブジェクト取得します。 (MarshalByRefObject から継承されます。)
パブリック メソッド GetType  現在のインスタンスType取得します。 (Object から継承されます。)
パブリック メソッド InitializeLifetimeService  対象インスタンス有効期間ポリシー制御する有効期間サービス オブジェクト取得します。 (MarshalByRefObject から継承されます。)
パブリック メソッド Read オーバーライドされます圧縮解除されたバイト数を、指定したバイト配列読み取ります。
パブリック メソッド ReadByte  ストリームから 1 バイト読み取りストリーム内の位置1 バイト進めますストリーム末尾場合は -1 を返します。 (Stream から継承されます。)
パブリック メソッド ReferenceEquals  指定した複数Object インスタンス同一かどうか判断します。 (Object から継承されます。)
パブリック メソッド Seek オーバーライドされます。 このプロパティサポートされていないため、常に NotSupportedException をスローます。
パブリック メソッド SetLength オーバーライドされます。 このプロパティサポートされていないため、常に NotSupportedExceptionスローます。
パブリック メソッド Synchronized  指定した Stream オブジェクトラップするスレッド セーフな (同期された) ラッパー作成します。 (Stream から継承されます。)
パブリック メソッド ToString  現在の Object を表す String返します。 (Object から継承されます。)
パブリック メソッド Write オーバーライドされます圧縮されたバイトを、指定したバイト配列から基になるストリーム書き込みます
パブリック メソッド WriteByte  ストリーム現在位置バイト書き込みストリーム位置1 バイトだけ進めます。 (Stream から継承されます。)
プロテクト メソッドプロテクト メソッド
参照参照

関連項目

GZipStream クラス
System.IO.Compression 名前空間



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