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WinMain Function

The WinMain function is called by the system as the initial entry point for a Windows-based application.


int WinMain(      

    HINSTANCE hInstance,     HINSTANCE hPrevInstance,     LPSTR lpCmdLine,     int nCmdShow );


hInstance[in] Handle to the current instance of the application. hPrevInstance[in] Handle to the previous instance of the application. This parameter is always NULL. If you need to detect whether another instance already exists, create a uniquely named mutex using the CreateMutex function. CreateMutex will succeed even if the mutex already exists, but the function will return ERROR_ALREADY_EXISTS. This indicates that another instance of your application exists, because it created the mutex first. lpCmdLine[in] Pointer to a null-terminated string specifying the command line for the application, excluding the program name. To retrieve the entire command line, use the GetCommandLine function. nCmdShow[in] Specifies how the window is to be shown. This parameter can be one of the following values. SW_HIDE