Convert.ToBase64CharArray Método

Origem:

Convert.cs

Origem:

Convert.cs

Origem:

Convert.cs

public:
 static int ToBase64CharArray(cli::array <System::Byte> ^ inArray, int offsetIn, int length, cli::array <char> ^ outArray, int offsetOut, Base64FormattingOptions options);

public static int ToBase64CharArray (byte[] inArray, int offsetIn, int length, char[] outArray, int offsetOut, Base64FormattingOptions options);

[System.Runtime.InteropServices.ComVisible(false)]
public static int ToBase64CharArray (byte[] inArray, int offsetIn, int length, char[] outArray, int offsetOut, Base64FormattingOptions options);

static member ToBase64CharArray : byte[] * int * int * char[] * int * Base64FormattingOptions -> int

[<System.Runtime.InteropServices.ComVisible(false)>]
static member ToBase64CharArray : byte[] * int * int * char[] * int * Base64FormattingOptions -> int

Public Shared Function ToBase64CharArray (inArray As Byte(), offsetIn As Integer, length As Integer, outArray As Char(), offsetOut As Integer, options As Base64FormattingOptions) As Integer

Parâmetros

Retornos

Um inteiro com sinal de 32 bits que contém o número de bytes em outArray.

Atributos

ComVisibleAttribute

Exceções

Exemplos

O exemplo a seguir demonstra o ToBase64CharArray método. A entrada é dividida em grupos de três bytes (24 bits) cada. Consequentemente, cada grupo consiste em quatro números de 6 bits em que cada número varia de 0 a 63 decimal. Neste exemplo, existem 85 grupos de 3 bytes com um byte restante. O primeiro grupo consiste nos valores hexadecimais 00, 01 e 02, que produzem quatro valores de 6 bits iguais a 0, 0, 4 e 2 decimais. Esses quatro valores correspondem aos dígitos de base 64 "A", "A", "E" e "C" no início da saída.

Caso um número integral de grupos de 3 bytes não exista, os bytes restantes são preenchidos efetivamente com zero para formar um grupo completo. Neste exemplo, o valor do último byte é FF hexadecimal. Os primeiros 6 bits são iguais ao decimal 63, que corresponde ao dígito de base 64 "/" no final da saída, e os 2 próximos bits são preenchidos com zeros para produzir o decimal 48, que corresponde ao dígito de base 64, "w". Os dois últimos valores de 6 bits estão sendo preenchidos e correspondem ao caractere de preenchimento sem valor, "=".

// 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

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
open System

let arraysAreEqual (a1: byte[]) (a2: byte[]) =
    a1.Length = a2.Length &&
    Array.forall2 (=) a2 a1

let byteArray1 = Array.zeroCreate<byte> 256
let charArray  = Array.zeroCreate<char> 352
let nl = Environment.NewLine

let ruler =
    $"         1         2         3         4         5         6         7      {nl}" +
    $"1234567890123456789012345678901234567890123456789012345678901234567890123456{nl}" +
    "----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+-"

// 1) Initialize and display a Byte array of arbitrary data.
printfn $"1) Input: A Byte array of arbitrary data.{nl}"
for i = 0 to byteArray1.Length - 1 do
    byteArray1[i] <- byte i
    printf $"{byteArray1[i]:X2} "
    if (i + 1) % 20 = 0 then 
        printfn ""
printf $"{nl}{nl}"

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

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

// 4) Are the input and output Byte arrays equivalent?
printfn $"4) The output Byte array is equal to the input Byte array: {arraysAreEqual byteArray1 byteArray2}"


// 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
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
   
   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
'
'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

Comentários

O subconjunto de elementos do inArray parâmetro começando na posição offsetIn, é usado como um valor numérico e convertido em um subconjunto de elementos no outArray parâmetro começando na posição offsetOut.length O valor retornado indica o número de elementos convertidos em outArray. O subconjunto de outArray consiste em dígitos de base 64.

Os dígitos de base 64 em ordem crescente a partir de zero são os caracteres maiúsculos de "A" a "Z", os caracteres minúsculos de "a" a "z", os numerais de "0" a "9" e os símbolos "+" e "/". O caractere sem valor "=" é usado para preenchimento à direita.

Os parâmetros offset e length são números assinados de 32 bits. Os offsetIn parâmetros e offsetOut são posições de matriz baseadas em zero.

Se o options parâmetro for definido InsertLineBreaks como e a saída da conversão for maior que 76 caracteres, uma quebra de linha será inserida a cada 76 caracteres. Uma quebra de linha é definida como um caractere de retorno de carro (U+000D) seguido por um caractere de alimentação de linha (U+000A). Para obter mais informações, consulte RFC 2045, "Multipurpose Internet Mail Extensions", em https://www.rfc-editor.org/.

Confira também

• FromBase64CharArray(Char[], Int32, Int32)
• ToBase64Transform

Origem:

Convert.cs

Origem:

Convert.cs

Origem:

Convert.cs

public:
 static int ToBase64CharArray(cli::array <System::Byte> ^ inArray, int offsetIn, int length, cli::array <char> ^ outArray, int offsetOut);

public static int ToBase64CharArray (byte[] inArray, int offsetIn, int length, char[] outArray, int offsetOut);

static member ToBase64CharArray : byte[] * int * int * char[] * int -> int

Public Shared Function ToBase64CharArray (inArray As Byte(), offsetIn As Integer, length As Integer, outArray As Char(), offsetOut As Integer) As Integer

Parâmetros

Retornos

Um inteiro com sinal de 32 bits que contém o número de bytes em outArray.

Exceções

Exemplos

O exemplo a seguir demonstra como usar o ToBase64CharArray método para UUencode (codificar em base 64) um fluxo binário e salvar a codificação em um arquivo.

public:
   void EncodeWithCharArray()
   {
      FileStream^ inFile;
      array<Byte>^binaryData;

      try
      {
         inFile = gcnew FileStream( inputFileName,
                                    FileMode::Open,
                                    FileAccess::Read );
         binaryData = gcnew array<Byte>((int)(inFile->Length));
         long bytesRead = inFile->Read( binaryData, 0,
                                        (int)inFile->Length );
         inFile->Close();
      }
      catch ( Exception^ exp ) 
      {
         // Error creating stream or reading from it.
         Console::WriteLine( "{0}", exp->Message );
         return;
      }
      
      // Convert the binary input into Base64 UUEncoded output.
      // Each 3 Byte sequence in the source data becomes a 4 Byte
      // sequence in the character array. 
      long arrayLength = (long)((4.0 / 3.0) * binaryData->Length);
      
      // If array length is not divisible by 4, go up to the next
      // multiple of 4.
      if ( arrayLength % 4 != 0 )
      {
         arrayLength += 4 - arrayLength % 4;
      }

      array<Char>^ base64CharArray = gcnew array<Char>(arrayLength);
      try
      {
         Convert::ToBase64CharArray( binaryData,
                                     0,
                                     binaryData->Length,
                                     base64CharArray, 0 );
      }
      catch ( ArgumentNullException^ ) 
      {
         Console::WriteLine( "Binary data array is null." );
         return;
      }
      catch ( ArgumentOutOfRangeException^ ) 
      {
         Console::WriteLine( "Char Array is not large enough." );
         return;
      }
      
      // Write the UUEncoded version to the output file.
      StreamWriter^ outFile;
      try
      {
         outFile = gcnew StreamWriter( outputFileName,
                                       false,
                                       Text::Encoding::ASCII );
         outFile->Write( base64CharArray );
         outFile->Close();
      }
      catch ( Exception^ exp ) 
      {
         // Error creating stream or writing to it.
         Console::WriteLine( " {0}", exp->Message );
      }
   }

public void EncodeWithCharArray() {
   System.IO.FileStream inFile;
   byte[]             binaryData;

   try {
      inFile = new System.IO.FileStream(inputFileName,
                                 System.IO.FileMode.Open,
                                System.IO.FileAccess.Read);
      binaryData = new Byte[inFile.Length];
      long bytesRead = inFile.Read(binaryData, 0,
                           (int) inFile.Length);
      inFile.Close();
   }
   catch (System.Exception exp) {
      // Error creating stream or reading from it.
      System.Console.WriteLine("{0}", exp.Message);
      return;
   }

   // Convert the binary input into Base64 UUEncoded output.
   // Each 3 byte sequence in the source data becomes a 4 byte
   // sequence in the character array.
   long arrayLength = (long) ((4.0d/3.0d) * binaryData.Length);

   // If array length is not divisible by 4, go up to the next
   // multiple of 4.
   if (arrayLength % 4 != 0) {
      arrayLength += 4 - arrayLength % 4;
   }

   char[] base64CharArray = new char[arrayLength];
   try {
      System.Convert.ToBase64CharArray(binaryData,
                               0,
                               binaryData.Length,
                               base64CharArray,
                               0);
   }
   catch (System.ArgumentNullException) {
      System.Console.WriteLine("Binary data array is null.");
      return;
   }
   catch (System.ArgumentOutOfRangeException) {
      System.Console.WriteLine("Char Array is not large enough.");
      return;
   }

   // Write the UUEncoded version to the output file.
   System.IO.StreamWriter outFile;
   try {
      outFile = new System.IO.StreamWriter(outputFileName,
                              false,
                              System.Text.Encoding.ASCII);
      outFile.Write(base64CharArray);
      outFile.Close();
   }
   catch (System.Exception exp) {
      // Error creating stream or writing to it.
      System.Console.WriteLine("{0}", exp.Message);
   }
}

let encodeWithCharArray () =
    try
        use inFile =
            new FileStream(inputFileName, FileMode.Open, FileAccess.Read)

        let binaryData =
            Array.zeroCreate<byte> (int inFile.Length)

        inFile.Read(binaryData, 0, int inFile.Length)
        |> ignore

        // Convert the binary input into Base64 UUEncoded output.
        // Each 3 byte sequence in the source data becomes a 4 byte
        // sequence in the character array.
        let arrayLength =
            (4. / 3.) * float binaryData.Length |> int64

        // If array length is not divisible by 4, shadow up to the next multiple of 4.
        let arrayLength =
            if arrayLength % 4L <> 0L then
                arrayLength + (4L - arrayLength % 4L)
            else
                arrayLength

        let base64CharArray = Array.zeroCreate<char> (int arrayLength)

        Convert.ToBase64CharArray(binaryData, 0, binaryData.Length, base64CharArray, 0)
        |> ignore
        // Write the UUEncoded version to the output file.
        use outFile =
            new StreamWriter(outputFileName, false, Encoding.ASCII)

        outFile.Write(base64CharArray)
        outFile.Close()
    with
    | :? ArgumentNullException -> printfn "Binary data array is null."
    | :? ArgumentOutOfRangeException -> printfn "Char Array is not large enough."
    | e ->
        // Error creating stream or writing to it.
        printfn $"{e.Message}"

Public Sub EncodeWithCharArray()
   Dim inFile As System.IO.FileStream
   Dim binaryData() As Byte

   Try
      inFile = New System.IO.FileStream(inputFileName, _
                                        System.IO.FileMode.Open, _
                                        System.IO.FileAccess.Read)
      ReDim binaryData(inFile.Length)
      Dim bytesRead As Long = inFile.Read(binaryData, _
                                          0, _
                                          CInt(inFile.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 binary input into Base64 UUEncoded output.
   ' Each 3 byte sequence in the source data becomes a 4 byte
   ' sequence in the character array. 
   Dim arrayLength As Long 
   arrayLength = (4 / 3) * binaryData.Length
   If arrayLength Mod 4 <> 0 Then
      arrayLength = arrayLength + 4 - arrayLength Mod 4
   End If

   Dim base64CharArray(arrayLength - 1) As Char
   Try
      System.Convert.ToBase64CharArray(binaryData, _
                                       0, _
                                       binaryData.Length, _
                                       base64CharArray, 0)
   Catch exp As System.ArgumentNullException
      System.Console.WriteLine("Binary data array is null.")
      Return
   Catch exp As System.ArgumentOutOfRangeException
      System.Console.WriteLine("Char Array is not large enough.")
      Return
   End Try

   ' Write the UUEncoded version to the output file.
   Dim outFile As System.IO.StreamWriter
   Try
      outFile = New System.IO.StreamWriter(outputFileName, _
                                           False, _
                                           System.Text.Encoding.ASCII)
      outFile.Write(base64CharArray)
      outFile.Close()
   Catch exp As System.Exception
      ' Error creating stream or writing to it.
      System.Console.WriteLine("{0}", exp.Message)
   End Try
End Sub

Comentários

O subconjunto de length elementos de inArray começando na posição offsetIn, é tomado como um valor numérico e convertido em um subconjunto de elementos na outArray posição offsetOutinicial . O valor retornado indica o número de elementos convertidos em outArray. O subconjunto de outArray consiste em dígitos de base 64.

Os dígitos de base 64 em ordem crescente a partir de zero são os caracteres maiúsculos de "A" a "Z", os caracteres minúsculos de "a" a "z", os numerais de "0" a "9" e os símbolos "+" e "/". O caractere sem valor, "=", é usado no preenchimento à direita.

Os parâmetros offset e length são números assinados de 32 bits. Os offsetIn parâmetros e offsetOut são posições de matriz baseadas em zero.

Confira também

• FromBase64CharArray(Char[], Int32, Int32)
• ToBase64Transform