SendMessage和Findwindow用法

1。SendMessage和Findwindow用法：发送方 以下是VB代码：

Imports System.Runtime.InteropServices
Public Class Form1
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 Button1 As System.Windows.Forms.Button
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.Button1 = New System.Windows.Forms.Button
Me.SuspendLayout()
'
'Button1
'
Me.Button1.Location = New System.Drawing.Point(435, 349)
Me.Button1.Name = "Button1"
Me.Button1.Size = New System.Drawing.Size(85, 24)
Me.Button1.TabIndex = 0
Me.Button1.Text = "Button1"
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
Me.ClientSize = New System.Drawing.Size(549, 388)
Me.Controls.Add(Me.Button1)
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout(False)

End Sub

#End Region
'以下是C#中声明方法：
' [DllImport("user32.dll")]
'public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

'[DllImport("user32.dll")]
'public static extern IntPtr FindWindowEx(IntPtr hwndParent,IntPtr hwndChildAfter,string lpszClass,string lpszWindow);

'[DllImport("user32.dll",CharSet=CharSet.Unicode)]
'public static extern IntPtr PostMessage(IntPtr hwnd,int wMsg,IntPtr wParam,IntPtr lParam);

<DllImport("user32.dll", CharSet:=CharSet.Unicode, entrypoint:="FindWindow")> _
Public Shared Function FindWindow(ByVal lpClassName As String, ByVal lpWindowName As String) As Integer

End Function

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim a As Integer = FindWindow(Nothing, "SendMessage2")
Dim ptr As IntPtr = Marshal.StringToHGlobalUni("Are you ok?")
SendMessage(a, &H400, ptr, 0)
Marshal.FreeHGlobal(ptr)

End Sub
<DllImport("user32.dll", CharSet:=CharSet.Unicode, entrypoint:="SendMessageW")> _
Public Shared Function SendMessage(ByVal hwnd As Integer, ByVal wMsg As Integer, ByVal wParam As IntPtr, ByVal lParam As Integer) As Integer

End Function

End Class

2。SendMessage和Findwindow用法：接收方

Public Class Form1
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 Button1 As System.Windows.Forms.Button
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.Button1 = New System.Windows.Forms.Button
Me.SuspendLayout()
'
'Button1
'
Me.Button1.Location = New System.Drawing.Point(194, 201)
Me.Button1.Name = "Button1"
Me.Button1.Size = New System.Drawing.Size(72, 23)
Me.Button1.TabIndex = 0
Me.Button1.Text = "Button1"
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
Me.ClientSize = New System.Drawing.Size(292, 273)
Me.Controls.Add(Me.Button1)
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout(False)

End Sub

#End Region

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

End Sub
Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
If m.Msg = &H400 Then
MessageBox.Show(System.Runtime.InteropServices.Marshal.PtrToStringUni(m.WParam))
Else
MyBase.WndProc(m)
End If
End Sub
End Class