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Tip of the Day
Home » Tip Bank » C++
Language: C++
Expertise: Advanced
Apr 5, 2002

WEBINAR:

On-Demand

Application Security Testing: An Integral Part of DevOps


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 is
running
		if (GetLastError() == ERROR_ALREADY_EXISTS)
		{
			cout << "another instance 
of this program is running" << endl;
			return;
		}
	}
}
Tomer Abramson
 
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