Convert.FromBase64CharArray メソッドとは? わかりやすく解説

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Convert.FromBase64CharArray メソッド

Unicode 文字配列サブセット変換します。これにより、バイナリ データBase64数字として等価8 ビット符号なし整数配列エンコードされますパラメータは、入力配列サブセット変換する要素の数を指定します

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

Public Shared Function FromBase64CharArray
 ( _
    inArray As Char(), _
    offset As Integer, _
    length As Integer _
) As Byte()
Dim inArray As Char()
Dim offset As Integer
Dim length As Integer
Dim returnValue As Byte()

returnValue = Convert.FromBase64CharArray(inArray, offset, length)
public static byte[] FromBase64CharArray (
    char[] inArray,
    int offset,
    int length
)
public:
static array<unsigned char>^ FromBase64CharArray
 (
    array<wchar_t>^ inArray, 
    int offset, 
    int length
)
public static byte[] FromBase64CharArray (
    char[] inArray, 
    int offset, 
    int length
)
public static function FromBase64CharArray
 (
    inArray : char[], 
    offset : int, 
    length : int
) : byte[]

パラメータ

inArray

Unicode 文字配列

offset

inArray 内での位置

length

変換する inArray要素の数。

戻り値
inArrayoffset位置にある length 要素等価8 ビット符号なし整数配列

例外例外
例外種類条件

ArgumentNullException

inArraynull 参照 (Visual Basic では Nothing) です。

ArgumentOutOfRangeException

offset または length が 0 未満です。

または

lengthoffset足した数が、inArray 内に存在しない位置示してます。

FormatException

空白文字除いた inArray長さが 0 ではないか、または 4 の倍数ではありません。

または

inArray書式無効です。inArrayBase64 形式以外の文字2 つ上の埋め込み文字、または埋め込み文字の間に空白以外の文字含まれています。

解説解説

inArray は、Base64 形式文字空白文字、および後続埋め込み文字構成されます。Base64 形式文字を 0 から昇順並べると、大文字の "A" ~ "Z"、小文字の "a" ~ "z"、数字の "0" ~ "9"、および "+" と "/" の記号なります

空白文字、およびそれらの Unicode 名と 16 進数コード ポイントは、タブ (CHARACTER TABULATIONU+0009)、改行 (LINE FEEDU+000A)、復帰 (CARRIAGE RETURNU+000D)、および空白 (SPACEU+0020) です。空白文字はすべて無視されるため、任意の数の空白文字inArray含めることができます

値として解釈されい文字 "=" は、文字列末尾埋め込み用に使用されます。inArray末尾は、1 つまたは 2 つ埋め込み文字構成されます。

使用例使用例

FromBase64CharArray メソッド使用してuuencode されたデータ (Base64 形式データ) をデコードし、バイナリ出力として保存する方法次のコード例示します

Public Sub DecodeWithCharArray()
   Dim inFile As System.IO.StreamReader
   Dim base64CharArray() As Char

   Try
      inFile = New System.IO.StreamReader(inputFileName, _
                                          System.Text.Encoding.ASCII)

      ReDim base64CharArray(inFile.BaseStream.Length - 1)
      inFile.Read(base64CharArray, 0, inFile.BaseStream.Length)
      inFile.Close()
   Catch exp As System.Exception
      ' Error creating stream or reading from it.
      System.Console.WriteLine("{0}", exp.Message)
      Return
   End Try

   ' Convert the Base64 UUEncoded input into binary output.
   Dim binaryData() As Byte
   Try
      binaryData = System.Convert.FromBase64CharArray(base64CharArray, 0, _
                                                base64CharArray.Length)
   Catch exp As System.ArgumentNullException
      System.Console.WriteLine("Base 64 character array is null.")
      Return
   Catch exp As System.FormatException
      System.Console.WriteLine("Base 64 Char Array length is not
 " + _
               "4 or is not an even multiple of 4")
      Return
   End Try

   ' Write out the decoded data.
   Dim outFile As System.IO.FileStream
   Try
      outFile = New System.IO.FileStream(outputFileName, _
                                         System.IO.FileMode.Create, _
                                         System.IO.FileAccess.Write)
      outFile.Write(binaryData, 0, binaryData.Length - 1)
      outFile.Close()
   Catch exp As System.Exception
      ' Error creating stream or writing to it.
      System.Console.WriteLine("{0}", exp.Message)
   End Try
End Sub
public void DecodeWithCharArray() {
    System.IO.StreamReader inFile;     
    char[] base64CharArray;

    try {
        inFile = new System.IO.StreamReader(inputFileName,
                                        System.Text.Encoding.ASCII);
        base64CharArray = new char[inFile.BaseStream.Length];
        inFile.Read(base64CharArray, 0, (int)inFile.BaseStream.Length);
        inFile.Close();
    }
    catch (System.Exception exp) {
        // Error creating stream or reading from it.
        System.Console.WriteLine("{0}", exp.Message);
        return;
    }

    // Convert the Base64 UUEncoded input into binary output.
    byte[] binaryData;
    try {
        binaryData = 
            System.Convert.FromBase64CharArray(base64CharArray,
                                               0,
                                               base64CharArray.Length);
    }
    catch ( System.ArgumentNullException ) {
        System.Console.WriteLine("Base 64 character array is null.");
        return;
    }
    catch ( System.FormatException ) {
        System.Console.WriteLine("Base 64 Char Array length is not " +
            "4 or is not an even multiple of 4." );
        return;
    }

    // Write out the decoded data.
    System.IO.FileStream outFile;
    try {
        outFile = new System.IO.FileStream(outputFileName,
                                           System.IO.FileMode.Create,
                                           System.IO.FileAccess.Write);
        outFile.Write(binaryData, 0, binaryData.Length);
        outFile.Close();
    }
    catch (System.Exception exp) {
        // Error creating stream or writing to it.
        System.Console.WriteLine("{0}", exp.Message);
    }
}
public:
   void DecodeWithCharArray()
   {
      StreamReader^ inFile;
      array<Char>^base64CharArray;
      try
      {
         inFile = gcnew StreamReader( inputFileName,
                                      Text::Encoding::ASCII );
         base64CharArray = gcnew array<Char>((int)(inFile->BaseStream->Length));
         inFile->Read( base64CharArray, 0, (int)inFile->BaseStream->Length
 );
         inFile->Close();
      }
      catch ( Exception^ exp ) 
      {
         
         // Error creating stream or reading from it.
         Console::WriteLine( "{0}", exp->Message );
         return;
      }
      
      // Convert the Base64 UUEncoded input into binary output.
      array<Byte>^binaryData;
      try
      {
         binaryData = Convert::FromBase64CharArray( base64CharArray,
                                                    0,
                                                    base64CharArray->Length );
      }
      catch ( ArgumentNullException^ ) 
      {
         Console::WriteLine( "Base 64 character array is null."
 );
         return;
      }
      catch ( FormatException^ ) 
      {
         Console::WriteLine( "Base 64 Char Array length is not " +
            "4 or is not an even multiple of 4." );
         return;
      }
      
      // Write out the decoded data.
      FileStream^ outFile;
      try
      {
         outFile = gcnew FileStream( outputFileName,
                                     FileMode::Create,
                                     FileAccess::Write );
         outFile->Write( binaryData, 0, binaryData->Length );
         outFile->Close();
      }
      catch ( Exception^ exp ) 
      {
         // Error creating stream or writing to it.
         Console::WriteLine( "{0}", exp->Message );
      }
   }
public void DecodeWithCharArray()
{
    System.IO.StreamReader inFile;
    char base64CharArray[];

    try {
        inFile = new System.IO.StreamReader(inputFileName,
                System.Text.Encoding.get_ASCII());
        base64CharArray = new char[
                        (int)inFile.get_BaseStream().get_Length()];
        inFile.Read(base64CharArray, 0,    
            (int)(inFile.get_BaseStream().get_Length()));
        inFile.Close();
    }
    catch (System.Exception exp) {
        // Error creating stream or reading from it.
        System.Console.WriteLine("{0}", exp.get_Message());
        return;
    }

    // Convert the Base64 UUEncoded input into binary output.
    ubyte binaryData[];

    try {
        binaryData = System.Convert.FromBase64CharArray(base64CharArray,
                    0, base64CharArray.length);
    }
    catch (System.ArgumentNullException exp) {
        System.Console.WriteLine("Base 64 character array is null.");
        return;
    }
    catch (System.FormatException exp) {
        System.Console.WriteLine(("Base 64 Char Array length is not " 
            + "4 or is not an even multiple of 4."));
        return;
    }

    // Write out the decoded data.
    System.IO.FileStream outFile;

    try {
        outFile = new System.IO.FileStream(outputFileName, 
                System.IO.FileMode.Create, System.IO.FileAccess.Write );
        outFile.Write(binaryData, 0, binaryData.length);
        outFile.Close();
    }
    catch (System.Exception exp) {
        // Error creating stream or writing to it.
        System.Console.WriteLine("{0}", exp.get_Message());
    }
} //DecodeWithCharArray

ToBase64CharArray メソッドおよび FromBase64CharArray メソッドコード例次に示します入力は、3 バイト (24 ビット) ごとのグループ分けられます。たがって各グループは、10 進数の 0 ~ 63範囲4 つの 6 ビット数値構成されます。この例では、85 個の 3 バイトグループがあり、1 バイト残されています。最初グループは、16 進000102構成されます。これらは、10 進数の 0、0、4、2 に相当する 4 つの 6 ビット値を生成します。この 4 つの値は、出力最初にある Base64 形式文字 "A"、"A"、"E"、"C" に対応します

3 バイトグループ整数存在しない場合は、残りバイトに 0 が効率的に埋め込まれ、完全なグループ形成されます。この例では、最後バイト値は 16 進数FF です。最初の 6 ビット10 進数63相当し出力末尾にある Base64 形式文字 "/" に対応します次の 2 ビットには 0 が埋め込まれ10 進数48生成されます。これは、Base64 形式文字 "w" に対応します最後2 つの 6 ビット値が埋め込まれます。これらは値として解釈されない埋め込み文字 "=" に対応します

' This example demonstrates the Convert.ToBase64CharArray() and 
'                               Convert.FromBase64CharArray methods
Imports System

Class Sample
   Public Shared Sub Main()
      Dim byteArray1(255) As Byte
      Dim byteArray2(255) As Byte
      Dim charArray(351) As Char
      Dim charArrayLength As Integer
      Dim nl As String =
 Environment.NewLine
      
      Dim ruler1a As String
 = "         1         2         3         4"
      Dim ruler2a As String
 = "1234567890123456789012345678901234567890"
      Dim ruler3a As String
 = "----+----+----+----+----+----+----+----+"
      Dim ruler1b As String
 = "         5         6         7      "
      Dim ruler2b As String
 = "123456789012345678901234567890123456"
      Dim ruler3b As String
 = "----+----+----+----+----+----+----+-"
      Dim ruler As String
 = String.Concat(ruler1a, ruler1b, nl, _
                                          ruler2a, ruler2b, nl, _
                                          ruler3a, ruler3b)

      ' 1) Initialize and display a Byte array of arbitrary data.
      Console.WriteLine("1) Input: A Byte array of arbitrary data.{0}",
 nl)
      Dim x As Integer
      For x = 0 To byteArray1.Length - 1
         byteArray1(x) = CByte(x)
         Console.Write("{0:X2} ", byteArray1(x))
         If(x + 1) Mod 20 = 0 Then
            Console.WriteLine()
         End If
      Next x
      Console.Write("{0}{0}", nl)
      
      ' 2) Convert the input Byte array to a Char array, with newlines
 inserted.
      charArrayLength = Convert.ToBase64CharArray( _
                                byteArray1, 0, byteArray1.Length, _
                                charArray, 0, _
                                Base64FormattingOptions.InsertLineBreaks)
      Console.WriteLine("2) Convert the input Byte array to a
 Char array with newlines.")
      Console.Write("   Output: A Char array (length = {0}). ",
 charArrayLength)
      Console.WriteLine("The elements of the array are:{0}",
 nl)
      Console.WriteLine(ruler)
      Console.WriteLine(New [String](charArray))
      Console.WriteLine()
      
      ' 3) Convert the Char array back to a Byte array.
      Console.WriteLine("3) Convert the Char array to an output
 Byte array.")
      byteArray2 = Convert.FromBase64CharArray(charArray, 0, charArrayLength)
      
      ' 4) Are the input and output Byte arrays equivalent?
      Console.WriteLine("4) The output Byte array is equal to
 the input Byte array?: {0}", _
                            ArraysAreEqual(byteArray1, byteArray2))
   End Sub 'Main
   
   Public Shared Function
 ArraysAreEqual(a1() As Byte, a2() As
 Byte) As Boolean
      If a1.Length <> a2.Length Then
         Return False
      End If
      Dim i As Integer
      For i = 0 To a1.Length - 1
         If a1(i) <> a2(i) Then
            Return False
         End If
      Next i
      Return True
   End Function 'ArraysAreEqual
End Class 'Sample
'
'This example produces the following results:
'
'1) Input: A Byte array of arbitrary data.
'
'00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13
'14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27
'28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B
'3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F
'50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63
'64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77
'78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B
'8C 8D 8E 8F 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F
'A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3
'B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF C0 C1 C2 C3 C4 C5 C6 C7
'C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB
'DC DD DE DF E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF
'F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF
'
'2) Convert the input Byte array to a Char array with newlines.
'   Output: A Char array (length = 352). The elements of the array are:
'
'         1         2         3         4         5         6      
   7
'1234567890123456789012345678901234567890123456789012345678901234567890123456
'----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+-
'AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIjJCUmJygpKissLS4vMDEyMzQ1Njc4
'OTo7PD0+P0BBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWprbG1ub3Bx
'cnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6PkJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmq
'q6ytrq+wsbKztLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX2Nna29zd3t/g4eLj
'5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7/P3+/w==
'
'3) Convert the Char array to an output Byte array.
'4) The output Byte array is equal to the input Byte array?: True
'
// This example demonstrates the Convert.ToBase64CharArray() and
//                               Convert.FromBase64CharArray methods

using System;

class Sample 
{
    public static void Main()
 
    {
    byte[] byteArray1 = new byte[256];
    byte[] byteArray2 = new byte[256];
    char[] charArray  = new char[352];
    int charArrayLength;
    string nl = Environment.NewLine;

    string ruler1a = "         1         2         3    
     4";
    string ruler2a = "1234567890123456789012345678901234567890";
    string ruler3a = "----+----+----+----+----+----+----+----+";
    string ruler1b = "         5         6         7    
  ";
    string ruler2b = "123456789012345678901234567890123456";
    string ruler3b = "----+----+----+----+----+----+----+-";
    string ruler   = String.Concat(ruler1a, ruler1b, nl, 
                                   ruler2a, ruler2b, nl,
                                   ruler3a, ruler3b);

// 1) Initialize and display a Byte array of arbitrary data.
    Console.WriteLine("1) Input: A Byte array of arbitrary data.{0}", nl);
    for (int x = 0; x < byteArray1.Length;
 x++)
    {
    byteArray1[x] = (byte)x;
    Console.Write("{0:X2} ", byteArray1[x]);
    if (((x+1)%20) == 0) Console.WriteLine();
    }
    Console.Write("{0}{0}", nl);

// 2) Convert the input Byte array to a Char array, with newlines inserted.
    charArrayLength = 
        Convert.ToBase64CharArray(byteArray1, 0, byteArray1.Length, 
                                   charArray, 0, Base64FormattingOptions.InsertLineBreaks);
    Console.WriteLine("2) Convert the input Byte array to a Char array with
 newlines.");
    Console.Write("   Output: A Char array (length = {0}). ", charArrayLength);
    Console.WriteLine("The elements of the array are:{0}", nl);
    Console.WriteLine(ruler);
    Console.WriteLine(new String(charArray));
    Console.WriteLine();

// 3) Convert the Char array back to a Byte array.
    Console.WriteLine("3) Convert the Char array to an output Byte array.");
    byteArray2 = Convert.FromBase64CharArray(charArray, 0, charArrayLength);

// 4) Are the input and output Byte arrays equivalent?
    Console.WriteLine("4) The output Byte array is equal to the input Byte array?:
 {0}", 
                      ArraysAreEqual(byteArray1, byteArray2));
    }

    public static bool ArraysAreEqual(byte[]
 a1, byte[] a2)
    {
    if (a1.Length != a2.Length) return false;
    for (int i = 0; i < a1.Length; i++)
        if (a1[i] != a2[i]) return false;
    return true;
    }
}
/*
This example produces the following results:

1) Input: A Byte array of arbitrary data.

00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13
14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27
28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B
3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F
50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63
64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77
78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B
8C 8D 8E 8F 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3
B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF C0 C1 C2 C3 C4 C5 C6 C7
C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB
DC DD DE DF E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF
F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF

2) Convert the input Byte array to a Char array with newlines.
   Output: A Char array (length = 352). The elements of the array are:

         1         2         3         4         5         6         7
1234567890123456789012345678901234567890123456789012345678901234567890123456
----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+-
AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIjJCUmJygpKissLS4vMDEyMzQ1Njc4
OTo7PD0+P0BBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWprbG1ub3Bx
cnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6PkJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmq
q6ytrq+wsbKztLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX2Nna29zd3t/g4eLj
5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7/P3+/w==

3) Convert the Char array to an output Byte array.
4) The output Byte array is equal to the input Byte array?: True

*/
// This example demonstrates the Convert.ToBase64CharArray() and
//                               Convert.FromBase64CharArray methods
using namespace System;
bool ArraysAreEqual( array<Byte>^a1, array<Byte>^a2
 );
int main()
{
   array<Byte>^byteArray1 = gcnew array<Byte>(256);
   array<Byte>^byteArray2 = gcnew array<Byte>(256);
   array<Char>^charArray = gcnew array<Char>(352);
   int charArrayLength;
   String^ nl = Environment::NewLine;
   String^ ruler1a = "         1         2         3         4";
   String^ ruler2a = "1234567890123456789012345678901234567890";
   String^ ruler3a = "----+----+----+----+----+----+----+----+";
   String^ ruler1b = "         5         6         7      ";
   String^ ruler2b = "123456789012345678901234567890123456";
   String^ ruler3b = "----+----+----+----+----+----+----+-";
   String^ ruler = String::Concat( ruler1a, ruler1b, nl, ruler2a, ruler2b, nl, ruler3a,
 ruler3b );
   
   // 1) Initialize and display a Byte array of arbitrary data.
   Console::WriteLine( "1) Input: A Byte array of arbitrary data.{0}",
 nl );
   for ( int x = 0; x < byteArray1->Length;
 x++ )
   {
      byteArray1[ x ] = (Byte)x;
      Console::Write( "{0:X2} ", byteArray1[ x ] );
      if ( ((x + 1) % 20) == 0 )
            Console::WriteLine();

   }
   Console::Write( "{0}{0}", nl );
   
   // 2) Convert the input Byte array to a Char array, with newlines
 inserted.
   charArrayLength = Convert::ToBase64CharArray( byteArray1, 0, byteArray1->Length,
 
                                                 charArray, 0, 
                                                 Base64FormattingOptions::InsertLineBreaks
 );
   Console::WriteLine( "2) Convert the input Byte array to a Char array with
 newlines." );
   Console::Write( "   Output: A Char array (length = {0}). ", charArrayLength
 );
   Console::WriteLine( "The elements of the array are:{0}", nl );
   Console::WriteLine( ruler );
   Console::WriteLine( gcnew String( charArray ) );
   Console::WriteLine();
   
   // 3) Convert the Char array back to a Byte array.
   Console::WriteLine( "3) Convert the Char array to an output Byte array."
 );
   byteArray2 = Convert::FromBase64CharArray( charArray, 0, charArrayLength );
   
   // 4) Are the input and output Byte arrays equivalent?
   Console::WriteLine( "4) The output Byte array is equal to the input Byte
 array?: {0}", ArraysAreEqual( byteArray1, byteArray2 ) );
}

bool ArraysAreEqual( array<Byte>^a1, array<Byte>^a2
 )
{
   if ( a1->Length != a2->Length )
      return false;

   for ( int i = 0; i < a1->Length; i++
 )
      if ( a1[ i ] != a2[ i ] )
            return false;

   return true;
}

/*
This example produces the following results:

1) Input: A Byte array of arbitrary data.

00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13
14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27
28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B
3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F
50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63
64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77
78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B
8C 8D 8E 8F 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3
B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF C0 C1 C2 C3 C4 C5 C6 C7
C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB
DC DD DE DF E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF
F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF

2) Convert the input Byte array to a Char array with newlines.
   Output: A Char array (length = 352). The elements of the array are:

         1         2         3         4         5         6         7
1234567890123456789012345678901234567890123456789012345678901234567890123456
----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+-
AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIjJCUmJygpKissLS4vMDEyMzQ1Njc4
OTo7PD0+P0BBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWprbG1ub3Bx
cnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6PkJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmq
q6ytrq+wsbKztLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX2Nna29zd3t/g4eLj
5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7/P3+/w==

3) Convert the Char array to an output Byte array.
4) The output Byte array is equal to the input Byte array?: True

*/
// This example demonstrates the Convert.ToBase64CharArray() and
//                               Convert.FromBase64CharArray methods
import System.*;

class Sample
{
    public static void main(String[]
 args)
    {
        ubyte byteArray1[] = new ubyte[256];
        ubyte byteArray2[] = new ubyte[256];
        char charArray[] = new char[352];
        int charArrayLength;
        String nl = Environment.get_NewLine();

        String ruler1a = "         1         2         3         4";
        String ruler2a = "1234567890123456789012345678901234567890";
        String ruler3a = "----+----+----+----+----+----+----+----+";
        String ruler1b = "         5         6         7      ";
        String ruler2b = "123456789012345678901234567890123456";
        String ruler3b = "----+----+----+----+----+----+----+-";
        String sTemp[] = {
            ruler1a, ruler1b, nl, ruler2a, ruler2b, nl, ruler3a, ruler3b
        };
        String ruler = String.Concat(sTemp);
        // 1) Initialize and display a Byte array of arbitrary data.
        Console.WriteLine("1) Input: A Byte array of arbitrary data.{0}",
 nl);
        for (int x = 0; x < byteArray1.get_Length();
 x++) {
            byteArray1[x] = (ubyte)x;
            Console.Write("{0:X2} ", byteArray1.get_Item(x));
            if ((x + 1) % 20 == 0) {
                Console.WriteLine();
            }
        }
        Console.Write("{0}{0}", nl);
        // 2) Convert the input Byte array to a Char array,
        // with newlines inserted.
        charArrayLength = Convert.ToBase64CharArray(byteArray1, 0,
            byteArray1.get_Length(), charArray, 0, 
            Base64FormattingOptions.InsertLineBreaks);
        Console.WriteLine("2) Convert the input Byte array to a Char "
            + "array with newlines.");
        Console.Write("   Output: A Char array (length = {0}). ",
            System.Convert.ToString(charArrayLength));
        Console.WriteLine("The elements of the array are:{0}", nl);
        Console.WriteLine(ruler);
        Console.WriteLine(new String(charArray));
        Console.WriteLine();
        // 3) Convert the Char array back to a Byte array.
        Console.WriteLine("3) Convert the Char array to an output Byte array.");
        byteArray2 = Convert.FromBase64CharArray(charArray, 0, charArrayLength);
        // 4) Are the input and output Byte arrays equivalent?
        Console.WriteLine("4) The output Byte array is equal to the input Byte
 "
            + "array?: {0}",
            System.Convert.ToString(ArraysAreEqual(byteArray1, byteArray2)));
    } //main

    public static boolean ArraysAreEqual(ubyte
 a1[], ubyte a2[]) 
    {
        if (a1.get_Length() != a2.get_Length()) {
            return false;
        }
        for (int i = 0; i < a1.get_Length();
 i++) {
            if (!a1.get_Item(i).Equals(a2.get_Item(i))) {
                return false;
            }
        }
        return true;
    } //ArraysAreEqual
} //Sample
/*
This example produces the following results:

1) Input: A Byte array of arbitrary data.

00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13
14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27
28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B
3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F
50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63
64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77
78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B
8C 8D 8E 8F 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3
B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF C0 C1 C2 C3 C4 C5 C6 C7
C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB
DC DD DE DF E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF
F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF

2) Convert the input Byte array to a Char array with newlines.
   Output: A Char array (length = 352). The elements of the array are:

         1         2         3         4         5         6         7
1234567890123456789012345678901234567890123456789012345678901234567890123456
----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+-
AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIjJCUmJygpKissLS4vMDEyMzQ1Njc4
OTo7PD0+P0BBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWprbG1ub3Bx
cnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6PkJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmq
q6ytrq+wsbKztLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX2Nna29zd3t/g4eLj
5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7/P3+/w==

3) Convert the Char array to an output Byte array.
4) The output Byte array is equal to the input Byte array?: True

*/
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