To create single instance of application

to create single instance of application at any time

this code helps to run only one instance of application

//just create mutex with valid name in InitInstance () method of MFC application

HANDLE hmutex = CreateMutex(NULL,FALSE,"JUSTTOCHECK");

// then check for that name whether it already exists or not by following code,

// if exists release mutex and return false otherwise just release the mutex

{

if ( hmutex && GetLastError () == ERROR_ALREADY_EXISTS)

ReleaseMutex (hmutex);

return FALSE;

}

ReleaseMutex (hmutex) ;

when you run the application it opens the window, keeping that open if you try to run the same application it won't

creates window.

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