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用c#在应用程序间发送消息
作者：kongxx
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”。
