用c#在應用程序間發送消息
作者：kongxx
首先建立兩個c#應用程序項目。
第一個項目包含一個windows form(form1),在form1上有一個button和一個textbox。
第二個項目包含一個windows form(form1),在form1上有兩個button，分別用來測試第一個應用程序中button的click事件和修改第一個應用程序中textbox的值。
第一個應用程序中form的代碼如下:
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 窗體設計器生成的代碼
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!");
}
}
第二個應用程序中form的代碼如下:
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 窗體設計器生成的代碼
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 = "測試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);
}
以上代碼可以在vs.net中編譯運行，也可以使用csc.exe編譯,如使用一下命令行：
f:>csc.exe form1.cs
f:>csc.exe testform1.cs
編譯后生成兩個.exe文件。
首先運行第一個程序，顯示form1窗體，然后運行第二個程序，顯示testform1窗體。
在testform1窗體上點擊button1按鈕（向form1窗體上的button1發送消息）此時顯示對話框提示“this is button1 click!”。
在testform1窗體上點擊button2按鈕（向form1窗體上的textbox1發送消息）此時在form1上的textbox1上顯示“測試aaa”。
