Disable Executing More than One Instance of a Program

Disable Executing More than One Instance of a Program

Sometimes you don’t want to enable the option of running more than one instance of an executable at a time. This can be achieved by using this fragment of code:

 void main(){ HANDLE hMutex = CreateMutex(NULL, FALSE, "programName"); // if Create mutex succeeded	if (hMutex)	{		// if we already have mutex with that name it means another instance isrunning		if (GetLastError() == ERROR_ALREADY_EXISTS)		{			cout << "another instance of this program is running" << endl;			return;		}	}}
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