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Posted on 2002-03-06
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Last Modified: 2013-11-20
Hello,
How to have single instace of my application?
Thnaks in advance,
Rani.
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Question by:rani2005
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Expert Comment

by:Axter
ID: 6844873
How To Prevent Multiple copies of a Program Running at the same Time
If you only want to prevent a second instance to run, a mutex object will do the job. It must be placed in the InitInstance method of the CWinApp derived class. As a name for the mutex-object, we chose the name of the application's executable file (CWinApp::m_pszExeName) but you can choose your own unique name.

BOOL COneInstanceApp::InitInstance()
{
     // Standard initialization
     // If you are not using these features and wish to reduce the size
     //  of your final executable, you should remove from the following
     //  the specific initialization routines you do not need.

     HANDLE hSingle;

     hSingle = ::CreateMutex(NULL, TRUE, m_pszExeName);
     if (ERROR_ALREADY_EXISTS == GetLastError()) {
     
          // The system closes the handle automatically when the process
          // terminates
          return FALSE;
     }


     // (...)

}

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Axter earned 100 total points
ID: 6844930
See following link for downloadable example:
http://cui.unige.ch/OSG/people/Past/fuentes/Mfc/HowTo_41.html
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Author Comment

by:rani2005
ID: 6845381
Thanks Axter.
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