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How To Prevent Multiple copies of a Program Running at the same Time<br />
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. <br />
<br />
BOOL COneInstanceApp::InitInsta<wbr />nce()<br />
{<br />
&nbsp; &nbsp; &nbsp;// Standard initialization<br />
&nbsp; &nbsp; &nbsp;// If you are not using these features and wish to reduce the size<br />
&nbsp; &nbsp; &nbsp;// &nbsp;of your final executable, you should remove from the following<br />
&nbsp; &nbsp; &nbsp;// &nbsp;the specific initialization routines you do not need.<br />
<br />
&nbsp; &nbsp; &nbsp;HANDLE hSingle;<br />
<br />
&nbsp; &nbsp; &nbsp;hSingle = ::CreateMutex(NULL, TRUE, m_pszExeName);<br />
&nbsp; &nbsp; &nbsp;if (ERROR_ALREADY_EXISTS == GetLastError()) {<br />
&nbsp; &nbsp; &nbsp;<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // The system closes the handle automatically when the process <br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // terminates<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return FALSE;<br />
&nbsp; &nbsp; &nbsp;}<br />
<br />
<br />
&nbsp; &nbsp; &nbsp;// (...)<br />
<br />
}<br />
<br />

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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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<div class="content wysiwyg-content">
Hello,<br />
How to have single instace of my application?<br />
Thnaks in advance,<br />
Rani.
</div>
</div>


Hello,
How to have single instace of my application?
Thnaks in advance,
Rani.

Single instance...

Kernel and system programming is the process of creating the software necessary for a computer or device to function and operate other programs. Some operating systems (such as Microsoft Windows) are proprietary, but others, such as the various Linux distributions, are open source.