ToBase64Transform-Klasse
Konvertiert einen CryptoStream in Base-64.
Namespace: System.Security.Cryptography
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
<ComVisibleAttribute(True)> _
Public Class ToBase64Transform
Implements ICryptoTransform, IDisposable
'Usage
Dim instance As ToBase64Transform
[ComVisibleAttribute(true)]
public class ToBase64Transform : ICryptoTransform, IDisposable
[ComVisibleAttribute(true)]
public ref class ToBase64Transform : ICryptoTransform, IDisposable
/** @attribute ComVisibleAttribute(true) */
public class ToBase64Transform implements ICryptoTransform, IDisposable
ComVisibleAttribute(true)
public class ToBase64Transform implements ICryptoTransform, IDisposable
Hinweise
Base-64-Content-Transfer-Encoding stellt beliebige Bitfolgen in einer nur von Maschinen lesbaren Form dar.
Beispiel
Im folgenden Codebeispiel wird die Verwendung von Membern der ToBase64Transform-Klasse veranschaulicht.
Imports System
Imports System.IO
Imports System.Security.Cryptography
Public Class Form1
Inherits System.Windows.Forms.Form
' Event handler for Run button.
Private Sub Button1_Click( _
ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button1.Click
tbxOutput.Cursor = Cursors.WaitCursor
tbxOutput.Text = ""
Dim appPath As String
appPath = (System.IO.Directory.GetCurrentDirectory() + "\\")
' Insert your file names into this method call.
EncodeFromFile(appPath + "members.vb", appPath + "membersvb.enc")
' Reset the cursor and conclude application.
tbxOutput.AppendText(vbCrLf + "This sample completed " + _
"successfully; press Exit to continue.")
tbxOutput.Cursor = Cursors.Default
End Sub
' Read in the specified source file and write out an encoded target file.
Private Sub EncodeFromFile( _
ByVal sourceFile As String, _
ByVal targetFile As String)
' Verify members.cs exists at the specified directory.
If (Not File.Exists(sourceFile)) Then
tbxOutput.AppendText("Unable to locate source file located at ")
tbxOutput.AppendText(sourceFile + ". Please correct the path ")
tbxOutput.AppendText("and run the sample again.")
Exit Sub
End If
' Retrieve the input and output file streams.
Dim inputFileStream As New FileStream( _
sourceFile, FileMode.Open, FileAccess.Read)
Dim outputFileStream As New FileStream( _
targetFile, FileMode.Create, FileAccess.Write)
' Create a new ToBase64Transform object to convert to base 64.
Dim base64Transform As New ToBase64Transform
' Create a new byte array with the size of the output block size.
Dim outputBytes(base64Transform.OutputBlockSize) As Byte
' Retrieve the file contents into a byte array.
Dim inputBytes(inputFileStream.Length) As Byte
inputFileStream.Read(inputBytes, 0, inputBytes.Length)
' Verify that multiple blocks can not be transformed.
If (Not base64Transform.CanTransformMultipleBlocks) Then
' Initializie the offset size.
Dim inputOffset As Integer = 0
' Iterate through inputBytes transforming by blockSize.
Dim inputBlockSize As Integer = base64Transform.InputBlockSize
While (inputBytes.Length - inputOffset > inputBlockSize)
base64Transform.TransformBlock( _
inputBytes, _
inputOffset, _
inputBytes.Length - inputOffset, _
outputBytes, _
0)
inputOffset += base64Transform.InputBlockSize
outputFileStream.Write(outputBytes, _
0, _
base64Transform.OutputBlockSize)
End While
' Transform the final block of data.
outputBytes = base64Transform.TransformFinalBlock( _
inputBytes, _
inputOffset, _
inputBytes.Length - inputOffset)
outputFileStream.Write(outputBytes, 0, outputBytes.Length)
tbxOutput.AppendText("Created encoded file at " + targetFile)
End If
' Determine if the current transform can be reused.
If (Not base64Transform.CanReuseTransform) Then
' Free up any used resources.
base64Transform.Clear()
End If
' Close file streams.
inputFileStream.Close()
outputFileStream.Close()
End Sub
' Event handler for Exit button.
Private Sub Button2_Click( _
ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button2.Click
Application.Exit()
End Sub
#Region " Windows Form Designer generated code "
Public Sub New()
MyBase.New()
'This call is required by the Windows Form Designer.
InitializeComponent()
'Add any initialization after the InitializeComponent() call
End Sub
'Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer
'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
Friend WithEvents Panel2 As System.Windows.Forms.Panel
Friend WithEvents Panel1 As System.Windows.Forms.Panel
Friend WithEvents Button1 As System.Windows.Forms.Button
Friend WithEvents Button2 As System.Windows.Forms.Button
Friend WithEvents tbxOutput As System.Windows.Forms.RichTextBox
<System.Diagnostics.DebuggerStepThrough()> _
Private Sub InitializeComponent()
Me.Panel2 = New System.Windows.Forms.Panel
Me.Button1 = New System.Windows.Forms.Button
Me.Button2 = New System.Windows.Forms.Button
Me.Panel1 = New System.Windows.Forms.Panel
Me.tbxOutput = New System.Windows.Forms.RichTextBox
Me.Panel2.SuspendLayout()
Me.Panel1.SuspendLayout()
Me.SuspendLayout()
'
'Panel2
'
Me.Panel2.Controls.Add(Me.Button1)
Me.Panel2.Controls.Add(Me.Button2)
Me.Panel2.Dock = System.Windows.Forms.DockStyle.Bottom
Me.Panel2.DockPadding.All = 20
Me.Panel2.Location = New System.Drawing.Point(0, 320)
Me.Panel2.Name = "Panel2"
Me.Panel2.Size = New System.Drawing.Size(616, 64)
Me.Panel2.TabIndex = 1
'
'Button1
'
Me.Button1.Dock = System.Windows.Forms.DockStyle.Right
Me.Button1.Font = New System.Drawing.Font( _
"Microsoft Sans Serif", _
9.0!, _
System.Drawing.FontStyle.Regular, _
System.Drawing.GraphicsUnit.Point, _
CType(0, Byte))
Me.Button1.Location = New System.Drawing.Point(446, 20)
Me.Button1.Name = "Button1"
Me.Button1.Size = New System.Drawing.Size(75, 24)
Me.Button1.TabIndex = 2
Me.Button1.Text = "&Run"
'
'Button2
'
Me.Button2.Dock = System.Windows.Forms.DockStyle.Right
Me.Button2.Font = New System.Drawing.Font( _
"Microsoft Sans Serif", _
9.0!, _
System.Drawing.FontStyle.Regular, _
System.Drawing.GraphicsUnit.Point, _
CType(0, Byte))
Me.Button2.Location = New System.Drawing.Point(521, 20)
Me.Button2.Name = "Button2"
Me.Button2.Size = New System.Drawing.Size(75, 24)
Me.Button2.TabIndex = 3
Me.Button2.Text = "E&xit"
'
'Panel1
'
Me.Panel1.Controls.Add(Me.tbxOutput)
Me.Panel1.Dock = System.Windows.Forms.DockStyle.Fill
Me.Panel1.DockPadding.All = 20
Me.Panel1.Location = New System.Drawing.Point(0, 0)
Me.Panel1.Name = "Panel1"
Me.Panel1.Size = New System.Drawing.Size(616, 320)
Me.Panel1.TabIndex = 2
'
'tbxOutput
'
Me.tbxOutput.AccessibleDescription = _
"Displays output from application."
Me.tbxOutput.AccessibleName = "Output textbox."
Me.tbxOutput.Dock = System.Windows.Forms.DockStyle.Fill
Me.tbxOutput.Location = New System.Drawing.Point(20, 20)
Me.tbxOutput.Name = "tbxOutput"
Me.tbxOutput.Size = New System.Drawing.Size(576, 280)
Me.tbxOutput.TabIndex = 1
Me.tbxOutput.Text = "Click the Run button to run the application."
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
Me.ClientSize = New System.Drawing.Size(616, 384)
Me.Controls.Add(Me.Panel1)
Me.Controls.Add(Me.Panel2)
Me.Name = "Form1"
Me.Text = "ToBase64Transform"
Me.Panel2.ResumeLayout(False)
Me.Panel1.ResumeLayout(False)
Me.ResumeLayout(False)
End Sub
#End Region
End Class
'
' This sample produces the following output:
'
' Created encoded file at C:\WindowsApplication1\\membersvb.enc
' This sample completed successfully; press Exit to continue.
using System;
using System.IO;
using System.Security.Cryptography;
class Members
{
[STAThread]
static void Main(string[] args)
{
string appPath = (System.IO.Directory.GetCurrentDirectory() + "\\");
// Insert your file names into this method call.
EncodeFromFile(appPath + "members.cs", appPath + "members.enc");
Console.WriteLine("This sample completed successfully; " +
"press Enter to exit.");
Console.ReadLine();
}
// Read in the specified source file and write out an encoded target file.
private static void EncodeFromFile(string sourceFile, string targetFile)
{
// Verify members.cs exists at the specified directory.
if (!File.Exists(sourceFile))
{
Console.Write("Unable to locate source file located at ");
Console.WriteLine(sourceFile + ".");
Console.Write("Please correct the path and run the ");
Console.WriteLine("sample again.");
return;
}
// Retrieve the input and output file streams.
FileStream inputFileStream =
new FileStream(sourceFile, FileMode.Open, FileAccess.Read);
FileStream outputFileStream =
new FileStream(targetFile, FileMode.Create, FileAccess.Write);
// Create a new ToBase64Transform object to convert to base 64.
ToBase64Transform base64Transform = new ToBase64Transform();
// Create a new byte array with the size of the output block size.
byte[] outputBytes = new byte[base64Transform.OutputBlockSize];
// Retrieve the file contents into a byte array.
byte[] inputBytes = new byte[inputFileStream.Length];
inputFileStream.Read(inputBytes, 0, inputBytes.Length);
// Verify that multiple blocks can not be transformed.
if (!base64Transform.CanTransformMultipleBlocks)
{
// Initializie the offset size.
int inputOffset = 0;
// Iterate through inputBytes transforming by blockSize.
int inputBlockSize = base64Transform.InputBlockSize;
while(inputBytes.Length - inputOffset > inputBlockSize)
{
base64Transform.TransformBlock(
inputBytes,
inputOffset,
inputBytes.Length - inputOffset,
outputBytes,
0);
inputOffset += base64Transform.InputBlockSize;
outputFileStream.Write(
outputBytes,
0,
base64Transform.OutputBlockSize);
}
// Transform the final block of data.
outputBytes = base64Transform.TransformFinalBlock(
inputBytes,
inputOffset,
inputBytes.Length - inputOffset);
outputFileStream.Write(outputBytes, 0, outputBytes.Length);
Console.WriteLine("Created encoded file at " + targetFile);
}
// Determine if the current transform can be reused.
if (! base64Transform.CanReuseTransform)
{
// Free up any used resources.
base64Transform.Clear();
}
// Close file streams.
inputFileStream.Close();
outputFileStream.Close();
}
}
//
// This sample produces the following output:
//
// Created encoded file at C:\ConsoleApplication1\\membersvcs.enc
// This sample completed successfully; press Enter to exit.
using namespace System;
using namespace System::IO;
using namespace System::Security::Cryptography;
ref class Members
{
public:
[STAThread]
static void Main()
{
String^ appPath = (String::Concat(
System::IO::Directory::GetCurrentDirectory(), L"\\" ));
// Insert your file names into this method call.
EncodeFromFile( String::Concat( appPath, L"members.cpp" ),
String::Concat( appPath, L"members.enc" ) );
Console::WriteLine( L"This sample completed successfully; "
L"press Enter to exit." );
Console::ReadLine();
}
private:
// Read in the specified source file and write out an encoded target file.
static void EncodeFromFile( String^ sourceFile, String^ targetFile )
{
// Verify members.cpp exists at the specified directory.
if ( !File::Exists( sourceFile ) )
{
Console::Write( L"Unable to locate source file located at " );
Console::WriteLine( L"{0}.", sourceFile );
Console::Write( L"Please correct the path and run the " );
Console::WriteLine( L"sample again." );
return;
}
// Retrieve the input and output file streams.
FileStream^ inputFileStream = gcnew FileStream(
sourceFile,FileMode::Open,FileAccess::Read );
FileStream^ outputFileStream = gcnew FileStream(
targetFile,FileMode::Create,FileAccess::Write );
// Create a new ToBase64Transform object to convert to base 64.
ToBase64Transform^ base64Transform = gcnew ToBase64Transform;
// Create a new byte array with the size of the output block size.
array<Byte>^outputBytes = gcnew array<Byte>(
base64Transform->OutputBlockSize);
// Retrieve the file contents into a byte array.
array<Byte>^inputBytes = gcnew array<Byte>(inputFileStream->Length);
inputFileStream->Read( inputBytes, 0, inputBytes->Length );
// Verify that multiple blocks can not be transformed.
if ( !base64Transform->CanTransformMultipleBlocks )
{
// Initializie the offset size.
int inputOffset = 0;
// Iterate through inputBytes transforming by blockSize.
int inputBlockSize = base64Transform->InputBlockSize;
while ( inputBytes->Length - inputOffset > inputBlockSize )
{
base64Transform->TransformBlock(
inputBytes,
inputOffset,
inputBytes->Length - inputOffset,
outputBytes,
0 );
inputOffset += base64Transform->InputBlockSize;
outputFileStream->Write(
outputBytes,
0,
base64Transform->OutputBlockSize );
}
// Transform the final block of data.
outputBytes = base64Transform->TransformFinalBlock(
inputBytes,
inputOffset,
inputBytes->Length - inputOffset );
outputFileStream->Write( outputBytes, 0, outputBytes->Length );
Console::WriteLine( L"Created encoded file at {0}", targetFile );
}
// Determine if the current transform can be reused.
if ( !base64Transform->CanReuseTransform )
{
// Free up any used resources.
base64Transform->Clear();
}
// Close file streams.
inputFileStream->Close();
outputFileStream->Close();
}
};
int main()
{
Members::Main();
}
//
// This sample produces the following output:
//
// Created encoded file at C:\ConsoleApplication1\\membersvcs.enc
// This sample completed successfully; press Enter to exit.
import System.*;
import System.IO.*;
import System.Security.Cryptography.*;
class Members
{
/** @attribute STAThread()
*/
public static void main(String[] args)
{
String appPath = System.IO.Directory.GetCurrentDirectory() + "\\";
// Insert your file names into this method call.
EncodeFromFile(appPath + "members.cs", appPath + "members.enc");
Console.WriteLine("This sample completed successfully; "
+ "press Enter to exit.");
Console.ReadLine();
} //main
// Read in the specified source file and write out an encoded target file.
private static void EncodeFromFile(String sourceFile, String targetFile)
{
// Verify members.cs exists at the specified directory.
if (!(File.Exists(sourceFile))) {
Console.Write("Unable to locate source file located at ");
Console.WriteLine(sourceFile + ".");
Console.Write("Please correct the path and run the ");
Console.WriteLine("sample again.");
return;
}
// Retrieve the input and output file streams.
FileStream inputFileStream = new FileStream(sourceFile,
FileMode.Open, FileAccess.Read);
FileStream outputFileStream = new FileStream(targetFile,
FileMode.Create, FileAccess.Write);
// Create a new ToBase64Transform object to convert to base 64.
ToBase64Transform base64Transform = new ToBase64Transform();
// Create a new byte array with the size of the output block size.
ubyte outputBytes[] = new ubyte[base64Transform.get_OutputBlockSize()];
// Retrieve the file contents into a byte array.
ubyte inputBytes[] = new ubyte[(ubyte)inputFileStream.get_Length()];
inputFileStream.Read(inputBytes, 0, inputBytes.get_Length());
// Verify that multiple blocks can not be transformed.
if (!(base64Transform.get_CanTransformMultipleBlocks())) {
// Initializie the offset size.
int inputOffset = 0;
// Iterate through inputBytes transforming by blockSize.
int inputBlockSize = base64Transform.get_InputBlockSize();
while (inputBytes.get_Length() - inputOffset > inputBlockSize) {
base64Transform.TransformBlock(inputBytes, inputOffset,
inputBytes.get_Length() - inputOffset, outputBytes, 0);
inputOffset += base64Transform.get_InputBlockSize();
outputFileStream.Write(outputBytes, 0, base64Transform.
get_OutputBlockSize());
}
// Transform the final block of data.
outputBytes = base64Transform.TransformFinalBlock(inputBytes,
inputOffset, inputBytes.get_Length() - inputOffset);
outputFileStream.Write(outputBytes, 0, outputBytes.get_Length());
Console.WriteLine("Created encoded file at " + targetFile);
}
// Determine if the current transform can be reused.
if (!(base64Transform.get_CanReuseTransform())) {
// Free up any used resources.
base64Transform.Clear();
}
// Close file streams.
inputFileStream.Close();
outputFileStream.Close();
} //EncodeFromFile
} //Members
//
// This sample produces the following output:
//
// Created encoded file at C:\ConsoleApplication1\\membersvcs.enc
// This sample completed successfully; press Enter to exit.
Vererbungshierarchie
System.Object
System.Security.Cryptography.ToBase64Transform
Threadsicherheit
Alle öffentlichen statischen (Shared in Visual Basic) Member dieses Typs sind threadsicher. Bei Instanzmembern ist die Threadsicherheit nicht gewährleistet.
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
ToBase64Transform-Member
System.Security.Cryptography-Namespace