ToBase64Transform クラス

定義

名前空間:

System.Security.Cryptography

アセンブリ:

System.Security.Cryptography.dll

Source:

Base64Transforms.cs

CryptoStream を base 64 に変換します。

public ref class ToBase64Transform : IDisposable, System::Security::Cryptography::ICryptoTransform

public class ToBase64Transform : IDisposable, System.Security.Cryptography.ICryptoTransform

type ToBase64Transform = class
    interface IDisposable
    interface ICryptoTransform

Public Class ToBase64Transform
Implements ICryptoTransform, IDisposable

継承

Object

ToBase64Transform

実装

IDisposable ICryptoTransform

例

次のコード例は、 クラスのメンバーを使用する方法を ToBase64Transform 示しています。

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.

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.

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.

注釈

Base 64 Content-Transfer-Encoding は、人間が判読できない形式の任意のビット シーケンスを表します。

コンストラクター

ToBase64Transform()

ToBase64Transform クラスの新しいインスタンスを初期化します。

プロパティ

CanReuseTransform	現在の変換を再利用できるかどうかを示す値を取得します。
CanTransformMultipleBlocks	複数のブロックを変換できるかどうかを示す値を取得します。
InputBlockSize	入力ブロック サイズを取得します。
OutputBlockSize	出力ブロック サイズを取得します。

メソッド

Clear()	ToBase64Transform によって使用されているすべてのリソースを解放します。
Dispose()	ToBase64Transform クラスの現在のインスタンスによって使用されているすべてのリソースを解放します。
Dispose(Boolean)	ToBase64Transform によって使用されているアンマネージド リソースを解放し、オプションでマネージド リソースも解放します。
Equals(Object)	指定されたオブジェクトが現在のオブジェクトと等しいかどうかを判断します。 (継承元 Object)
Finalize()	ToBase64Transform で使用されるアンマネージ リソースを解放します。
GetHashCode()	既定のハッシュ関数として機能します。 (継承元 Object)
GetType()	現在のインスタンスの Type を取得します。 (継承元 Object)
MemberwiseClone()	現在の Object の簡易コピーを作成します。 (継承元 Object)
ToString()	現在のオブジェクトを表す文字列を返します。 (継承元 Object)
TransformBlock(Byte[], Int32, Int32, Byte[], Int32)	入力バイト配列の指定した領域を base 64 に変換し、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。
TransformFinalBlock(Byte[], Int32, Int32)	指定したバイト配列の指定した領域を base 64 に変換します。

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