Detecting other prograrm instances in VC++ (MFC), please help...
I'm try to find a way in which to detect instances of other program in VC++ (MFC classes).
For example, say I have 6 Paint program running at once, but I want to limit only to 3 at a time, how do I check and close the others right before it started to run?
Please help, I'm new to Window programming.
You'll probably have to use FindWindow() and SendMessage(), you can look these two functions up on MSDN... but basically you want to find the window, and send a WM_CLOSE message to it.
It's much easier to check if your own program is being run more than once then it is to check if someone elses is. (eg Paint)
Thank you, that's all the pointers I needed, the rest I can eventually figure out.
Turn out it wasn't that easy as I thought it would be. Could you please help me a little bit further by showing me examples of how to use that function?
If you know the apps name then
hMapping = CreateFileMapping((HANDLE)0xffffffff, NULL, PAGE_READONLY, 0, 32, szAppName);
and using the
GetLastError()==ERROR_ALREADY_EXISTS
returns may work (can easily limit to only one instance).
Remember to close the handle at the end with CloseHandle().
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