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ToBase64Transform Class
Visual Studio 2008
Converts a CryptoStream to base 64.
Assembly: mscorlib (in mscorlib.dll)
The following code example demonstrates how to use members of the ToBase64Transform class.
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.
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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