form1.vb

Visual.Basic.NET实用编程百例-47.6M.zip

Friend Class Form1
    Inherits System.Windows.Forms.Form
#Region "Windows 窗体设计器生成的代码"
    Public Sub New()
        MyBase.New()
        '此调用是 Windows 窗体设计器所必需的。
        InitializeComponent()
    End Sub
    '窗体重写处置，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
    Public ToolTip1 As System.Windows.Forms.ToolTip
    '注意: 以下过程是 Windows 窗体设计器所必需的
    '可以使用 Windows 窗体设计器来修改它。
    '不要使用代码编辑器修改它。
    Public WithEvents Button2 As System.Windows.Forms.Button
    Public WithEvents Button1 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.components = New System.ComponentModel.Container
        Me.ToolTip1 = New System.Windows.Forms.ToolTip(Me.components)
        Me.Button2 = New System.Windows.Forms.Button
        Me.Button1 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'Button2
        '
        Me.Button2.BackColor = System.Drawing.SystemColors.Control
        Me.Button2.Cursor = System.Windows.Forms.Cursors.Default
        Me.Button2.ForeColor = System.Drawing.SystemColors.ControlText
        Me.Button2.Location = New System.Drawing.Point(32, 80)
        Me.Button2.Name = "Button2"
        Me.Button2.RightToLeft = System.Windows.Forms.RightToLeft.No
        Me.Button2.Size = New System.Drawing.Size(209, 33)
        Me.Button2.TabIndex = 1
        Me.Button2.Text = "关闭计算器"
        '
        'Button1
        '
        Me.Button1.BackColor = System.Drawing.SystemColors.Control
        Me.Button1.Cursor = System.Windows.Forms.Cursors.Default
        Me.Button1.ForeColor = System.Drawing.SystemColors.ControlText
        Me.Button1.Location = New System.Drawing.Point(32, 32)
        Me.Button1.Name = "Button1"
        Me.Button1.RightToLeft = System.Windows.Forms.RightToLeft.No
        Me.Button1.Size = New System.Drawing.Size(209, 33)
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "打开计算器"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.BackColor = System.Drawing.SystemColors.Control
        Me.ClientSize = New System.Drawing.Size(278, 153)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.Button1)
        Me.Cursor = System.Windows.Forms.Cursors.Default
        Me.Location = New System.Drawing.Point(4, 23)
        Me.Name = "Form1"
        Me.RightToLeft = System.Windows.Forms.RightToLeft.No
        Me.Text = "打开和关闭计算器"
        Me.ResumeLayout(False)

    End Sub
#End Region
   

    Private Sub Button2_Click(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles Button2.Click
        '关闭计算器
        Dim hWindow As Integer
        Dim hThread As Integer
        Dim hProcess As Integer
        Dim lProcessId As Integer
        Dim lngResult As Integer
        Dim lngReturnValue As Integer

        hWindow = FindWindow(vbNullString, "计算器")
        hThread = GetWindowThreadProcessId(hWindow, lProcessId)
        hProcess = OpenProcess(SYNCHRONIZE, 0, lProcessId)
        lngReturnValue = PostMessage(hWindow, WM_CLOSE, 0, 0)
        lngResult = WaitForSingleObject(hProcess, INFINITE)

        '判断计算器句柄是否存在
        System.Windows.Forms.Application.DoEvents()
        hWindow = FindWindow(vbNullString, "计算器")
        If IsWindow(hWindow) = 1 Then
            '存在，使用TerminateProcess函数关闭所有相关的进程
            MsgBox("程序仍然没有关闭。")
        Else
            MsgBox("所有程序已经关闭。")
        End If
    End Sub

    Private Sub Button1_Click(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles Button1.Click
        '打开计算器程序
        Shell("calc.exe", AppWinStyle.NormalNoFocus)
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub
End Class