vb.net的windows窗体实现dos命令

这个例子是从 水如烟的例子 修改过来的。如有不妥之处还请大家指正批评。

 

Imports System.Threading
Imports System.Runtime.CompilerServices
Public Class frmCmdExcute
    Inherits System.Windows.Forms.Form

#Region " Windows 窗体设计器生成的代码 "
    Public Sub New()

        MyBase.New()

        ''''该调用是 Windows 窗体设计器所必需的。
        InitializeComponent()

        ''''在 InitializeComponent() 调用之后添加任何初始化

    End Sub

    ''''窗体重写 dispose 以清理组件列表。

    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

    ''''Windows 窗体设计器所必需的
    Private components As System.ComponentModel.IContainer

    ''''注意: 以下过程是 Windows 窗体设计器所必需的
    ''''可以使用 Windows 窗体设计器修改此过程。
    ''''不要使用代码编辑器修改它。

    Friend WithEvents tbResult As System.Windows.Forms.TextBox
    Friend WithEvents Panel1 As System.Windows.Forms.Panel
    Friend WithEvents btnExcute As System.Windows.Forms.Button
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents btClear As System.Windows.Forms.Button
    Friend WithEvents tbComText As System.Windows.Forms.ComboBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.tbResult = New System.Windows.Forms.TextBox
        Me.Panel1 = New System.Windows.Forms.Panel
        Me.tbComText = New System.Windows.Forms.ComboBox
        Me.btClear = New System.Windows.Forms.Button
        Me.Label1 = New System.Windows.Forms.Label
        Me.btnExcute = New System.Windows.Forms.Button
        Me.Panel1.SuspendLayout()
        Me.SuspendLayout()
        ''''
        ''''tbResult
        ''''
        Me.tbResult.Anchor = CType((((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Bottom) _
                    Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.tbResult.BackColor = System.Drawing.SystemColors.Info
        Me.tbResult.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
        Me.tbResult.Location = New System.Drawing.Point(8, 8)
        Me.tbResult.Multiline = True
        Me.tbResult.Name = "tbResult"
        Me.tbResult.ScrollBars = System.Windows.Forms.ScrollBars.Both
        Me.tbResult.Size = New System.Drawing.Size(584, 304)
        Me.tbResult.TabIndex = 0
        Me.tbResult.Text = ""
        ''''
        ''''Panel1
        ''''
        Me.Panel1.Anchor = CType((System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.Panel1.Controls.Add(Me.tbComText)
        Me.Panel1.Controls.Add(Me.btClear)
        Me.Panel1.Controls.Add(Me.Label1)
        Me.Panel1.Controls.Add(Me.btnExcute)
        Me.Panel1.Location = New System.Drawing.Point(8, 320)
        Me.Panel1.Name = "Panel1"
        Me.Panel1.Size = New System.Drawing.Size(584, 40)
        Me.Panel1.TabIndex = 1
        ''''
        ''''tbComText
        ''''
        Me.tbComText.Location = New System.Drawing.Point(224, 8)
        Me.tbComText.Name = "tbComText"
        Me.tbComText.Size = New System.Drawing.Size(224, 20)
        Me.tbComText.TabIndex = 5
        Me.tbComText.Text = "Dir"
        ''''
        ''''btClear
        ''''
        Me.btClear.FlatStyle = System.Windows.Forms.FlatStyle.Flat
        Me.btClear.Location = New System.Drawing.Point(40, 8)
        Me.btClear.Name = "btClear"
        Me.btClear.Size = New System.Drawing.Size(80, 24)
        Me.btClear.TabIndex = 3
        Me.btClear.Text = "清空(&C)"
        ''''
        ''''Label1
        ''''
        Me.Label1.Location = New System.Drawing.Point(160, 8)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(48, 16)
        Me.Label1.TabIndex = 2
        Me.Label1.Text = "命令："
        ''''
        ''''btnExcute
        ''''
        Me.btnExcute.FlatStyle = System.Windows.Forms.FlatStyle.Flat
        Me.btnExcute.Location = New System.Drawing.Point(472, 8)
        Me.btnExcute.Name = "btnExcute"
        Me.btnExcute.Size = New System.Drawing.Size(80, 24)
        Me.btnExcute.TabIndex = 1
        Me.btnExcute.Text = "执行(&E)"
        ''''
        ''''frmCmdExcute
        ''''
        Me.AcceptButton = Me.btnExcute
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(600, 365)
        Me.Controls.Add(Me.Panel1)
        Me.Controls.Add(Me.tbResult)
        Me.Name = "frmCmdExcute"
        Me.Text = "Command Excute Result"
        Me.Panel1.ResumeLayout(False)
        Me.ResumeLayout(False)

    End Sub

#End Region

    Public Shared Sub Main()
        If System.Environment.OSVersion.ToString.IndexOf("NT") = -1 Then
            MsgBox("暂时不支持非NT系统,程序退出！")
            Application.Exit()
        Else
            Application.Run(New frmCmdExcute)
        End If
    End Sub

    Private Delegate Sub TextAddHandler(ByVal strPara As String)

#Region "private viable"
    Dim sw As IO.StreamWriter
    Dim sr As New MyStreamReader
    Dim err As New MyStreamReader
    Dim p As System.Diagnostics.Process = New System.Diagnostics.Process
    Dim psI As New System.Diagnostics.ProcessStartInfo(System.Environment.GetEnvironmentVariable("ComSpec"))
#End Region

    Private Sub frmCmdExcute_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        p = New System.Diagnostics.Process
        ''''"cmd.exe"为nt的命令行程序
        psI = New System.Diagnostics.ProcessStartInfo("cmd.exe")
        psI.UseShellExecute = False
        psI.RedirectStandardInput = True
        psI.RedirectStandardOutput = True
        psI.RedirectStandardError = True
        psI.CreateNoWindow = True
        p.StartInfo = psI

        p.Start()
        sw = p.StandardInput
        sr.stream = p.StandardOutput
        err.stream = p.StandardError
        sw.AutoFlush = True
        sr.stream.BaseStream.BeginRead(sr.bytes, 0, 1024, New AsyncCallback(AddressOf CBstream), sr)
        err.stream.BaseStream.BeginRead(err.bytes, 0, 1024, New AsyncCallback(AddressOf CBstream), err)
    End Sub

    Private Sub frmCmdExcute_Closed(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Closed
        p.Close()
        If Not sw Is Nothing Then
            sw.Close()
        End If
        If Not sr Is Nothing Then
            sr.stream.Close()
        End If
        If Not err Is Nothing Then
            err.stream.Close()
        End If

    End Sub

    Private Sub btClear_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btClear.Click
        Me.tbResult.Text = String.Empty
    End Sub

    Private Sub btnExcute_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExcute.Click
        Me.CmdExcute()
    End Sub

    Private Sub CmdExcute()
        Try
            Me.Cursor = System.Windows.Forms.Cursors.WaitCursor
            If Me.tbComText.Text <> "" Then
                sw.WriteLine(Me.tbComText.Text)
            Else
                sw.WriteLine("Dir")
            End If
            Me.Cursor = System.Windows.Forms.Cursors.Default

            ''''向combobox中添加元素
            Me.tbComText.Items.Add(Me.tbComText.Text)
            Me.tbComText.SelectionStart = 0
            Me.tbComText.SelectionLength = Me.tbComText.Text.Length
            Me.tbComText.Focus()
        Catch ex As Exception
            MsgBox("CmdExcute--" & ex.ToString)
        End Try
    End Sub

    Private Sub AppText(ByVal strAdd As String)
        Me.tbResult.Text &= strAdd
    End Sub

    ''''回调函数
    ''''为了保证执行invoke方法的线程顺序，使用了MethodImpl
    <MethodImpl(MethodImplOptions.Synchronized)> _
     Sub CBstream(ByVal s As IAsyncResult)
        Try
            Dim t As MyStreamReader = CType(s.AsyncState, MyStreamReader)
            If t.stream.BaseStream Is Nothing Then
                Exit Sub
            End If
            Dim i As Integer = t.stream.BaseStream.EndRead(s)
            Dim strReceive As String = System.Text.Encoding.Default.GetString(t.bytes, 0, i)
            Me.Invoke(New TextAddHandler(AddressOf AppText), New Object() {strReceive})
            t.stream.BaseStream.BeginRead(t.bytes, 0, 1024, New AsyncCallback(AddressOf CBstream), t)
        Catch ex As Exception
            MsgBox("CBstream--" & ex.ToString)
        End Try
    End Sub

    Friend Class MyStreamReader
        Public stream As IO.StreamReader
        Public bytes(1024) As Byte
        Public Sub New()
        End Sub
    End Class
End Class