🚀 go-pugleaf

"JoeBlack" <no.one@no.where> wrote in message
news:412f0c57@newsgroups.borland.com...

>         // the mutex does not work, it always starts the app

You aren't checking to see why OpenMutex() may return NULL, and you aren't
checking CreateMutex() for any errors at all.

Use this code instead:

    WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
    {
        HANDLE mutex = CreateMutex(NULL, TRUE, "Millenium.mutex");
        if( mutex == NULL )
        {
            MessageBox(NULL, ("Could not create the mutex: " +
SysErrorMessage(GetLastError())).c_str(), "Error", MB_OK);
            return 0;
        }

        if( GetLastError() == ERROR_ALREADY_EXISTS )
        {
            MessageBox(0, "This application is already running.\n"
                "You may only run one instance at any one time", "Error",
MB_OK);
        }
        else
        {
            try
            {
                //...
            }
            catch (Exception &exception)
            {
                //...
            }
        }

        CloseHandle(mutex);
        return 0;
    }


Gambit