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程序打开以后,如果用户再次运行程序,如何控制只打开一个程序,第二次运行的时候,显示第一个运行的界面

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程序打开以后,如果用户再次运行程序,如何控制只打开一个程序,第二次运行的时候,显示第一个运行的界面

发表于：2007-03-09 09:41:49 楼主

发表于：2007-03-09 09:43:201楼得分:0

createmutex

发表于：2007-03-09 09:44:172楼得分:0

如果检测到已运行则发送wm_show消息

发表于：2007-03-09 09:49:023楼得分:0

在program.cs中加入下面的代码就可以实现程序只打开一次：
static void main（)
{
process instance = runninginstance（);
if （instance == null)
{
application.run（new initial（));
}
else
{
handlerunninginstance（instance);
}
}

public static process runninginstance（)
{
process current = process.getcurrentprocess（);
process[] processes = process.getprocessesbyname（current.processname);

//loop through the running processes in with the same name
foreach （process process in processes)
{
//ignore the current process
if （process.id != current.id)
{
//make sure that the process is running from the exe file.
if （assembly.getＥＸＥＣutingassembly（).location.replace（ "/ ", "\\ ") == current.mainmodule.filename)
{
//return the other process instance.
return process;
}
}
}
//no other instance was found, return null.
return null;
}

public static void handlerunninginstance（process instance)
{
//make sure the window is not minimized or maximized
showwindowasync（instance.mainwindowhandle, ws_shownormal);

//set the real intance to foreground window
setforegroundwindow（instance.mainwindowhandle);
}

[dllimport（ "user32.dll ")]
private static extern bool showwindowasync（intptr hwnd, int cmdshow);
[dllimport（ "user32.dll ")]
private static extern bool setforegroundwindow（intptr hwnd);
private const int ws_shownormal = 1;
}

发表于：2007-03-09 09:50:464楼得分:0

using system;
using system.runtime.interopservices;
using system.windows.forms;
using system.diagnostics;
using system.reflection;

public class oneinstnace
{

[stathread]
public static void main（)
{
//get the running instance.
process instance = runninginstance（);
if （instance == null)
{
//there isn 't another instance, show our form.
application.run （new form（));
}
else
{
//there is another instance of this process.
handlerunninginstance（instance);
}
}
public static process runninginstance（)
{
process current = process.getcurrentprocess（);
process[] processes = process.getprocessesbyname （current.processname);

//loop through the running processes in with the same name
foreach （process process in processes)
{
//ignore the current process
if （process.id != current.id)
{
//make sure that the process is running from the exe file.
if （assembly.getＥＸＥＣutingassembly（).location.replace（ "/ ", "\\ ") ==
current.mainmodule.filename)
{
//return the other process instance.
return process;
}
}
}

//no other instance was found, return null.
return null;
}

public static void handlerunninginstance（process instance)
{
//make sure the window is not minimized or maximized
showwindowasync （instance.mainwindowhandle , ws_shownormal);

//set the real intance to foreground window
setforegroundwindow （instance.mainwindowhandle);
}

[dllimport（ "user32.dll ")]

private static extern bool showwindowasync（
intptr hwnd, int cmdshow);
[dllimport（ "user32.dll ")] private static extern bool
setforegroundwindow（intptr hwnd);
private const int ws_shownormal = 1;
}

发表于：2007-03-09 09:51:365楼得分:0

晕网速一慢被插队了...

发表于：2007-03-09 09:53:546楼得分:0

来晚了
已经解决了
前段时间刚碰到这个问题
不过我的是.net compact framework 1.1的

发表于：2007-03-09 09:58:447楼得分:0

就是用process類來解決。

发表于：2007-03-09 09:59:418楼得分:0

学习

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