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!");
 }
}

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);
}

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”。

更多关于c#相关内容感兴趣的读者可查看本站专题：《winform控件用法总结》、《c#窗体操作技巧汇总》、《c#数据结构与算法教程》、《c#常见控件用法教程》、《c#面向对象程序设计入门教程》及《c#程序设计之线程使用技巧总结》

希望本文所述对大家c#程序设计有所帮助。