🚀 go-pugleaf

>Sean Kennedy wrote:
>> A terrible hack could be upon startup immediately create a file in the
>> %TEMP% directory.  If the create function returns a 'File exists'
>> return, otherwise, continue.
>
>This may be more terrible than you imagined. Do you intend that the
>program delete the file when it exits? What happens if the program
>crashes and the file is never deleted? In that case it would seem that
>the program could never be run again, unless the person running it was
>sophisticated enough to know to delete the file, and with most users
>that will never happen.

HANDLE hMutex;

if( (hMutex = CreateMutex( NULL, FALSE, "Unique mutex name here" )) !=
INVALID_HANDLE_VALUE )
{
	if( GetLastError() == ERROR_ALREADY_EXISTS )
	{
		// do whatever you want to tell the user
	}
}

The mutex handle will get closed when your app exits, but to be nice,
you may want to close it yourself.

-Pat