C#实现在应用程序间发送消息的方法示例

本文实例讲述了C#实现在应用程序间发送消息的方法。分享给大家供大家参考，具体如下：

首先建立两个C#应用程序项目。

第一个项目包含一个Windows Form(Form1),在Form1上有一个Button和一个TextBox。

第二个项目包含一个Windows Form(Form1),在Form1上有两个Button，分别用来测试第一个应用程序中Button的Click事件和修改第一个应用程序中TextBox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.Button button1;

private System.Windows.Forms.TextBox textBox1;

private System.ComponentModel.Container components = 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 = new System.Windows.Forms.TextBox();

this.SuspendLayout();

//

// button1

//

this.button1.Location = new System.Drawing.Point(32, 24);

this.button1.Name = "button1";

this.button1.TabIndex = 0;

this.button1.Text = "button1";

this.button1.Click += new System.EventHandler(this.button1_Click);

//

// textBox1

//

this.textBox1.Location = new System.Drawing.Point(32, 64);

this.textBox1.Name = "textBox1";

this.textBox1.TabIndex = 1;

this.textBox1.Text = "textBox1";

//

// Form1

//

this.AutoScaleBaseSize = new System.Drawing.Size(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(object sender, System.EventArgs e) {

MessageBox.Show("This is button1 click!");

}

}

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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 TestForm1 : System.Windows.Forms.Form {

private System.Windows.Forms.Button button1;

private System.Windows.Forms.Button button2;

private System.ComponentModel.Container 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.Windows.Forms.Button();

this.SuspendLayout();

//

// button1

//

this.button1.Location = new System.Drawing.Point(32, 24);

this.button1.Name = "button1";

this.button1.TabIndex = 0;

this.button1.Text = "button1";

this.button1.Click += new System.EventHandler(this.button1_Click);

//

// button2

//

this.button2.Location = new System.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.AutoScaleBaseSize = new System.Drawing.Size(6, 14);

this.ClientSize = new System.Drawing.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(object sender, System.EventArgs e) {

IntPtr hwnd_win ;

IntPtr hwnd_button ;

hwnd_win = FindWindow("WindowsForms10.Window.8.app3","Form1");

hwnd_button = FindWindowEx(hwnd_win ,new IntPtr(0) ,"WindowsForms10.BUTTON.app3","button1");

const int BM_CLICK = 0x00F5;

Message msg = Message.Create(hwnd_button ,BM_CLICK ,new IntPtr(0),new IntPtr(0));

PostMessage(msg.HWnd ,msg.Msg ,msg.WParam ,msg.LParam);

}

private void button2_Click(object sender, System.EventArgs e) {

const int WM_CHAR = 0x0102;

IntPtr hwnd_win ;

IntPtr hwnd_textbox ;

hwnd_win = FindWindow("WindowsForms10.Window.8.app3","Form1");

hwnd_textbox = FindWindowEx(hwnd_win ,new IntPtr(0) ,"WindowsForms10.EDIT.app3","textBox1");

string strtext = "测试aaa";

UnicodeEncoding encode = new UnicodeEncoding();

char[] chars = encode.GetChars(encode.GetBytes(strtext));

Message msg ;

foreach (char c in chars ) {

msg = Message.Create(hwnd_textbox ,WM_CHAR ,new IntPtr(c),new IntPtr(0));

PostMessage(msg.HWnd ,msg.Msg ,msg.WParam ,msg.LParam);

}

}

[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);

}

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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

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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窗体上点击button1按钮(向Form1窗体上的button1发送消息)此时显示对话框提示“This is button1 click!”。

在TestForm1窗体上点击button2按钮(向Form1窗体上的textBox1发送消息)此时在Form1上的textBox1上显示“测试aaa”。

希望本文所述对大家C#程序设计有所帮助。

(编辑：雷林鹏 来源：网络)