用c#在应用程式间发送消息

用c#在应用程式间发送消息 

首先建立两个c#应用程式项目。 

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式中button的

click事件和修改第一个应用程式中textbox的值。 

第一个应用程式中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!"); 
 } 
} 

第二个应用程式中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); 
} 

以上代码能够在vs.net中编译运行，也能够使用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文档。 

  首先运行第一个程式，显示form1窗体，然后运行第二个程式，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”。