FromBase64Transform.TransformBlock-Methode
Wandelt den angegebenen Bereich des Eingabebytearrays aus Base-64 um und kopiert das Ergebnis in den angegebenen Bereich des Ausgabebytearrays.
Namespace: System.Security.Cryptography
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Function TransformBlock ( _
inputBuffer As Byte(), _
inputOffset As Integer, _
inputCount As Integer, _
outputBuffer As Byte(), _
outputOffset As Integer _
) As Integer
'Usage
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)
public int TransformBlock (
byte[] inputBuffer,
int inputOffset,
int inputCount,
byte[] outputBuffer,
int outputOffset
)
public:
virtual int TransformBlock (
array<unsigned char>^ inputBuffer,
int inputOffset,
int inputCount,
array<unsigned char>^ outputBuffer,
int outputOffset
) sealed
public final int TransformBlock (
byte[] inputBuffer,
int inputOffset,
int inputCount,
byte[] outputBuffer,
int outputOffset
)
public final function TransformBlock (
inputBuffer : byte[],
inputOffset : int,
inputCount : int,
outputBuffer : byte[],
outputOffset : int
) : int
Parameter
- inputBuffer
Die aus Base-64 zu berechnende Eingabe.
- inputOffset
Der Offset im Eingabebytearray, ab dem Daten verwendet werden sollen.
- inputCount
Die Anzahl der Bytes im Eingabebytearray, die als Daten verwendet werden sollen.
- outputBuffer
Die Ausgabe, in die das Ergebnis geschrieben werden soll.
- outputOffset
Der Offset im Ausgabebytearray, ab dem Daten geschrieben werden sollen.
Rückgabewert
Die Anzahl der geschriebenen Bytes.
Ausnahmen
| Ausnahmetyp | Bedingung |
|---|---|
Der aktuelle FromBase64Transform wurde bereits freigegeben. |
Beispiel
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
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();
}
}
}
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" );
}
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
Plattformen
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
.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.
Versionsinformationen
.NET Framework
Unterstützt in: 2.0, 1.1, 1.0
Siehe auch
Referenz
FromBase64Transform-Klasse
FromBase64Transform-Member
System.Security.Cryptography-Namespace