another instance of program is running?

How to catch if another instance of the program is running?

The usual way in Win32 is to have the program create a named global semaphore/mutex/whatever first thing. They can be queried for. If it already exists, the app is already running.

Here is an example:

Code:

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HANDLE                g_hMutex;
        //Create A Mutex
        g_hMutex = CreateMutex( NULL, TRUE, "Program Name");        //Create A Mutex To Keep The Program From Running More Than Once
        if (g_hMutex && (GetLastError() == ERROR_ALREADY_EXISTS ))
                return 0;

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Thanks a lot

If the problem is that you don't want more then one instance of your app to run. Then you should google on Singelton classes. It's a verey common way to just make one instance of an app run.