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使用 C# 在应用程序之间发送消息‖

第一个项目包含一个Wi

ndows Form(Form1),在Form1上

有一个Button和一个TextBox。

第二个项目包含一个Wi 个应用程序中Button的Clic

ndows Form(Form1),在Form1上 k事件和修改第一个应用程序中T

有两个Button，分别用来测试第一 extBox的值。

第一个应用程序中Form的代码如下:

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

public class Form1 :

System.Windows.Forms.Form {

private System.Windows.Forms.Bu

tton button1;

private System.Windows.Forms.Te

xtBox textBox1;

private System.Comp

onentModel.Container compone

nts = null;

[STAThread]

static void Main() {

Application.Run(new Form1());

}

public Form1()

{

InitializeComponent();

}

protected override void Dispose

( bool disposing )

{

if( disposing )

{

if(components != null)

{

components.Dispose();

}

}

base.Dispose( disposing );

}

#region Windows 窗体设计器生成的代码

private void InitializeComponent()

{

this.button1 = new

System.Windows.Forms.Button

();

this.textBox1 = ne

w System.Windows.Forms.TextB

ox();

this.SuspendLayout();

//

// button1

//

this.button1.Locat

ion = new System.Drawing.Poi

nt(32, 24);

this.button1.Name = "button1";

this.button1.TabIndex = 0;

this.button1.Text = "button1";

this.button1.Click += new Syst

em.EventHandler(this.button1_Click);

//

// textBox1

//

this.textBox1.Location = new S

ystem.Drawing.Point(32, 64);

this.textBox1.Name = "textBox1";

this.textBox1.TabIndex = 1;

this.textBox1.Text = "textBox1";

//

// Form1

//

this.AutoScaleBase

Size = new System.Drawing.Si

ze(6, 14);

this.ClientSize =

new System.Drawing.Size(292,

266);

this.Controls.Add(this.textBox1);

this.Controls.Add(this.button1);

this.Name = "Form1";

this.Text = "Form1";

this.ResumeLayout(false);

}

#endregion

private void button1_Click(obje

ct sender, System.EventArgs e) {

MessageBox.Show("T

his is button1 click!");

}

}

第二个应用程序中Form的代码如下:

using System;

using System.Text;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Runtime.InteropServices;

public class TestFor

m1 : System.Windows.Forms.Fo

rm {

private System.Windows.Forms.Bu

tton button1;

private System.Wind

ows.Forms.Button button2;

private System.ComponentModel.C

ontainer components = null;

[STAThread]

static void Main() {

Application.Run(new TestForm1());

}

public TestForm1()

{

InitializeComponent();

}

protected override

void Dispose( bool disposing

)

{

if( disposing )

{

if(components != null)

{

components.Dispose();

}

}

base.Dispose( disposing );

}

#region Windows 窗体设计器生成的代码

private void InitializeComponent()

{

this.button1 = new

System.Windows.Forms.Button

();

this.button2 = new System.Wind

ows.Forms.Button();

this.SuspendLayout();

//

// button1

//

this.button1.Locat

ion = new System.Drawing.Poi

nt(32, 24);

this.button1.Name = "button1";

this.button1.TabIndex = 0;

this.button1.Text = "button1";

this.button1.Click += new Syst

em.EventHandler(this.button1_Click);

//

// button2

//

this.button2.Location = new Sy

stem.Drawing.Point(32, 64);

this.button2.Name = "button2";

this.button2.TabIndex = 0;

this.button2.Text = "button2";

this.button2.Click

+= new System.EventHandler(

this.button2_Click);

//

// TestForm1

//

this.AutoScaleBase

Size = new System.Drawing.Si

ze(6, 14);

this.ClientSize = new System.D

rawing.Size(292, 266);

this.Controls.Add(this.button1);

this.Controls.Add(this.button2);

this.Name = "TestForm1";

this.Text = "TestForm1";

this.ResumeLayout(false);

}

#endregion

private void button1_Click(obje

ct sender, System.EventArgs e) {

IntPtr hwnd_win ;

IntPtr hwnd_button ;

hwnd_win = FindWin

dow("WindowsForms10.Window.8

.app3","Form1");

hwnd_button = Find rms10.BUTTON.app3","butt

WindowEx(hwnd_win ,new IntPt on1");

r(0) ,"WindowsFo

const int BM_CLICK = 0x00F5;

Message msg = Mess IntPtr(0));

age.Create(hwnd_button ,BM_C

LICK ,new IntPtr(0),new

PostMessage(msg.HW

nd ,msg.Msg ,msg.WParam ,msg

.LParam);

}

private void button

2_Click(object sender, Syste

m.EventArgs e) {

const int WM_CHAR = 0x0102;

IntPtr hwnd_win ;

IntPtr hwnd_textbox ;

hwnd_win = FindWindow("Windows

Forms10.Window.8.app3","Form1");

hwnd_textbox = Fin orms10.EDIT.app3","textB

dWindowEx(hwnd_win ,new IntP ox1");

tr(0) ,"WindowsF

string strtext = "测试aaa";

UnicodeEncoding en

code = new UnicodeEncoding()

;

char[] chars = encode.GetChars

(encode.GetBytes(strtext));

Message msg ;

foreach (char c in chars ) {

msg = Message.Cre

ate(hwnd_textbox ,WM_CHAR ,n

ew IntPtr(c),new IntPtr(0));

PostMessage(msg.HWnd ,msg.Msg

,msg.WParam ,msg.LParam);

}

}

[DllImport("user32.dll")]

public static exter lpWindowName);

n IntPtr FindWindow(string l

pClassName, string

[DllImport("user32.dll")]

public static exter hwndChildAfter,string lp

n IntPtr FindWindowEx(IntPtr szClass,string lpszWindow);

hwndParent,IntPtr

[DllImport("user32.dll",CharSet

=CharSet.Unicode)]

public static exter wParam,IntPtr lParam);

n IntPtr PostMessage(IntPtr

hwnd,int wMsg,IntPtr

}

以上代码可以在VS.NET中编译运行，

也可以使用csc.exe编译,如使用一下命令行：

F:>csc.exe Form1.cs

F:>csc.exe TestForm1.cs

编译后生成两个.exe文件。

首先运行第一个程序，显示Form1窗

体，然后运行第二个程序，显示TestForm1窗体。

在TestForm1窗体上点 话框提示“This is button

击button1按钮（向Form1窗体上 1 click!”。

的button1发送消息）此时显示对

在TestForm1窗体上点击button2按钮 上的textBox1上显示“测试aaa”。

（向Form1窗体上的textBox1发送消息）此时在Form1

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