FromBase64Transform.TransformBlock メソッド

.NET Framework クラス ライブラリ リファレンス

FromBase64Transform.TransformBlock メソッド

入力バイト配列の指定した領域を base 64 から変換し、その結果を出力バイト配列の指定した領域にコピーします。

名前空間: System.Security.Cryptography
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

Public Function TransformBlock ( _
    inputBuffer As Byte(), _
    inputOffset As Integer, _
    inputCount As Integer, _
    outputBuffer As Byte(), _
    outputOffset As Integer _
) As Integer

Visual Basic (使用法)

Dim instance As FromBase64Transform
Dim inputBuffer As Byte()
Dim inputOffset As Integer
Dim inputCount As Integer
Dim outputBuffer As Byte()
Dim outputOffset As Integer
Dim returnValue As Integer

returnValue = instance.TransformBlock(inputBuffer, inputOffset, inputCount, outputBuffer,
 outputOffset)

C#

public int TransformBlock (
    byte[] inputBuffer,
    int inputOffset,
    int inputCount,
    byte[] outputBuffer,
    int outputOffset
)

C++

public:
virtual int TransformBlock (
    array<unsigned char>^ inputBuffer, 
    int inputOffset, 
    int inputCount, 
    array<unsigned char>^ outputBuffer, 
    int outputOffset
) sealed

J#

public final int TransformBlock (
    byte[] inputBuffer, 
    int inputOffset, 
    int inputCount, 
    byte[] outputBuffer, 
    int outputOffset
)

JScript

public final function TransformBlock (
    inputBuffer : byte[], 
    inputOffset : int, 
    inputCount : int, 
    outputBuffer : byte[], 
    outputOffset : int
) : int

パラメータ

inputBuffer

base 64 から変換する入力。

inputOffset

入力バイト配列内のデータの使用開始位置を示すオフセット。

inputCount

データとして使用する入力バイト配列内のバイト数。

outputBuffer

結果を書き込む先の出力。

outputOffset

データの書き込みの開始位置を示す出力バイト配列内のオフセット。

戻り値
書き込むバイト数。

例外

例外の種類	条件
ObjectDisposedException	現在の FromBase64Transform は既に破棄されています。

使用例

Visual Basic

Imports System
Imports System.IO
Imports System.Security.Cryptography

Namespace ToBase64Transform_Examples
    Class MyMainClass
        Public Shared Sub
 Main()
            'Insert your file names into this method call.
            DecodeFromFile("c:\encoded.txt", "c:\roundtrip.txt")
        End Sub 'Main

        Public Shared Sub
 DecodeFromFile(ByVal inFileName As String,
 ByVal outFileName As String)
            Dim myTransform As New
 FromBase64Transform(FromBase64TransformMode.IgnoreWhiteSpaces)

            Dim myOutputBytes(myTransform.OutputBlockSize - 1)
 As Byte

            'Open the input and output files.
            Dim myInputFile As New
 FileStream(inFileName, FileMode.Open, FileAccess.Read)
            Dim myOutputFile As New
 FileStream(outFileName, FileMode.Create, FileAccess.Write)

            'Retrieve the file contents into a byte array.
            Dim myInputBytes(myInputFile.Length - 1) As
 Byte
            myInputFile.Read(myInputBytes, 0, myInputBytes.Length)

            'Transform the data in chunks the size of InputBlockSize.
            Dim i As Integer
 = 0
            While myInputBytes.Length - i > 4 'myTransform.InputBlockSize
                myTransform.TransformBlock(myInputBytes, i, 4, myOutputBytes, 0)
 'myTransform.InputBlockSize
                i += 4 'myTransform.InputBlockSize
                myOutputFile.Write(myOutputBytes, 0, myTransform.OutputBlockSize)
            End While

            'Transform the final block of data.
            myOutputBytes = myTransform.TransformFinalBlock(myInputBytes, i, myInputBytes.Length
 - i)
            myOutputFile.Write(myOutputBytes, 0, myOutputBytes.Length)

            'Free up any used resources.
            myTransform.Clear()

            myInputFile.Close()
            myOutputFile.Close()
        End Sub 'DecodeFromFile
    End Class 'MyMainClass
End Namespace 'ToBase64Transform_Examples

C#

using System;
using System.IO;
using System.Security.Cryptography;

namespace ToBase64Transform_Examples
{
    class MyMainClass
    {
        public static void
 Main()
        {
            //Insert your file names into this method call.
            DecodeFromFile("c:\\encoded.txt", "c:\\roundtrip.txt");
        }

        public static void
 DecodeFromFile(string inFileName, string
 outFileName)
        {
            FromBase64Transform myTransform = new FromBase64Transform(FromBase64TransformMode.IgnoreWhiteSpaces);

            byte[] myOutputBytes = new byte[myTransform.OutputBlockSize];

            //Open the input and output files.
            FileStream myInputFile = new FileStream(inFileName,
 FileMode.Open, FileAccess.Read);
            FileStream myOutputFile = new FileStream(outFileName,
 FileMode.Create, FileAccess.Write);

            //Retrieve the file contents into a byte array.
            byte[] myInputBytes = new byte[myInputFile.Length];
            myInputFile.Read(myInputBytes, 0, myInputBytes.Length);

            //Transform the data in chunks the size of InputBlockSize.
            int i = 0;
            while(myInputBytes.Length - i > 4/*myTransform.InputBlockSize*/)
            {
                myTransform.TransformBlock(myInputBytes, i, 4/*myTransform.InputBlockSize*/,
 myOutputBytes, 0);
                i += 4/*myTransform.InputBlockSize*/;
                myOutputFile.Write(myOutputBytes, 0, myTransform.OutputBlockSize);
            }
            
            //Transform the final block of data.
            myOutputBytes = myTransform.TransformFinalBlock(myInputBytes, i, myInputBytes.Length
 - i);
            myOutputFile.Write(myOutputBytes, 0, myOutputBytes.Length);

            //Free up any used resources.
            myTransform.Clear();

            myInputFile.Close();
            myOutputFile.Close();
        }
    }
}

C++

using namespace System;
using namespace System::IO;
using namespace System::Security::Cryptography;
class MyMainClass
{
public:
   static void DecodeFromFile( String^ inFileName,
 String^ outFileName )
   {
      FromBase64Transform^ myTransform = gcnew FromBase64Transform( FromBase64TransformMode::IgnoreWhiteSpaces
 );
      array<Byte>^myOutputBytes = gcnew array<Byte>(myTransform->OutputBlockSize);
      
      //Open the input and output files.
      FileStream^ myInputFile = gcnew FileStream( inFileName,FileMode::Open,FileAccess::Read
 );
      FileStream^ myOutputFile = gcnew FileStream( outFileName,FileMode::Create,FileAccess::Write
 );
      
      //Retrieve the file contents into a Byte array.
      array<Byte>^myInputBytes = gcnew array<Byte>(myInputFile->Length);
      myInputFile->Read( myInputBytes, 0, myInputBytes->Length );
      
      //Transform the data in chunks the size of InputBlockSize.
      int i = 0;
      while ( myInputBytes->Length - i > 4 )
      {
         myTransform->TransformBlock( myInputBytes, i, 4, myOutputBytes, 0 );
         
         /*myTransform->InputBlockSize*/
         i += 4;
         
         /*myTransform->InputBlockSize*/
         myOutputFile->Write( myOutputBytes, 0, myTransform->OutputBlockSize
 );
      }

      
      //Transform the final block of data.
      myOutputBytes = myTransform->TransformFinalBlock( myInputBytes, i, myInputBytes->Length
 - i );
      myOutputFile->Write( myOutputBytes, 0, myOutputBytes->Length );
      
      //Free up any used resources.
      myTransform->Clear();
      myInputFile->Close();
      myOutputFile->Close();
   }

};

int main()
{
   MyMainClass * m = new MyMainClass;
   
   //Insert your file names into this method call.
   m->DecodeFromFile(  "c:\\encoded.txt",  "c:\\roundtrip.txt"
 );
}

J#

package ToBase64Transform_Examples; 
import System.*;
import System.IO.*;
import System.Security.Cryptography.*;

class MyMainClass
{
    public static void main(String[]
 args)
    {
        // Insert your file names into this method call.
        DecodeFromFile("c:\\encoded.txt", "c:\\roundtrip.txt");
    } //main

    public static void DecodeFromFile(String
 inFileName, String outFileName)
    {
        FromBase64Transform myTransform = 
            new FromBase64Transform(FromBase64TransformMode.IgnoreWhiteSpaces);
        ubyte myOutputBytes[] = new ubyte[myTransform.get_OutputBlockSize()];

        // Open the input and output files.
        FileStream myInputFile = 
            new FileStream(inFileName, FileMode.Open, FileAccess.Read);
        FileStream myOutputFile = 
            new FileStream(outFileName, FileMode.Create, FileAccess.Write);

        // Retrieve the file contents into a byte array.
        // const int temp = 2;
        ubyte myInputBytes[] = 
            new ubyte[(new Long(myInputFile.get_Length())).intValue()];
        myInputFile.Read(myInputBytes, 0, myInputBytes.length);

        // Transform the data in chunks the size of InputBlockSize.
        int i = 0;
        while (myInputBytes.length - i > 4/*myTransform.InputBlockSize*/)
 {
            myTransform.TransformBlock(myInputBytes, i, 
                4/*myTransform.InputBlockSize*/, myOutputBytes, 0);
            i += 4 /*myTransform.InputBlockSize*/;
            myOutputFile.Write(myOutputBytes, 0, 
                myTransform.get_OutputBlockSize());
        }

        // Transform the final block of data.
        myOutputBytes = myTransform.TransformFinalBlock(myInputBytes, 
            i, myInputBytes.length - i);
        myOutputFile.Write(myOutputBytes, 0, myOutputBytes.length);

        // Free up any used resources.
        myTransform.Clear();
        myInputFile.Close();
        myOutputFile.Close();
    } //DecodeFromFile
} //MyMainClass   

プラットフォーム

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

関連項目
FromBase64Transform クラス
FromBase64Transform メンバ
System.Security.Cryptography 名前空間
その他の技術情報
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