Check "Application Running .."

[new_2012]

Hi ,

For my project I need to check whether my application instance is already running or not.

I got the following code from Net ..


[code]


HANDLE mutex;

mutex = CreateMutex( NULL, TRUE, _T("MYAPPNAME"));

if ( GetLastError() == ERROR_ALREADY_EXISTS )
{
// There's another instance running. What do you do?
AfxMessageBox(_T("Application Already Exists"));
PostQuitMessage(0);
ExitThread(0);
return;

}
[\code]




The code works fine .. but the code even works fine , even if I pass any string as a parameter to CreateMutex.

for e.g.

mutex = CreateMutex( NULL, TRUE, _T("QQQQ"));


How it is working fine ? I am confused .. PL help

[VictorN]

It is working "fine" as long as no other application has created the same named object.
See:
http://msdn.microsoft.com/en-us/libr...(v=vs.85).aspx
Avoiding Multiple Instances of an Application

[new_2012]

Thank u VictorN sir ..

[Arjay]

For uniqueness, it's handy to just generate a guid (from the tools\create guid menu item in Visual Studio).

_T("81804F9D-84EB-472F-8E33-1073424CE635")

Also, read up on the global namespace for mutex naming, in case multiple users are logged in or remoted in to the same machine.

P.S. Don't use the guid I've posted above because I'm using it.

[OReubens]

P.S. Don't use the guid I've posted above because I'm using it.

Not smart should've created a new one "just in case".

[new_2012]

Thank you all .. I will read more on this