출처 : http://www.wolfzone.co.kr/bbs/view.php?id=ncu_develop&page=4&sn1=&divpage=1&sn=off&ss=on&sc=on&select_arrange=headnum&desc=asc&no=3

Application에서 초기 실행되는 InitInstance() 함수에서 이미 실행중인지 체크해서 실행중이면 실행중인 프로그램에게 제어권을 넘겨주고, 실행중이 아닌경우에만 실행되도록 하는 부분이 되겠습니다.

#define PROGRAM_TITLE "Wolf NCU Ver 2.0" BOOL CRunnerApp::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.         CRunnerDlg dlg; /* 원래 사용하던것         HWND hWnd = FindWindow(NULL, _T(PROGRAM_TITLE));         if(hWnd != NULL)         {                 SetForegroundWindow(hWnd);                 return TRUE;         } */         CWnd *pWndPrev, *pWndChild;         // 이번에 새로 붙인곳..         // Determine if a window with the programe title exists...         if (pWndPrev = CWnd::FindWindow(NULL, _T(PROGRAM_TITLE)))         {                 // If so, does it have any popups?                 pWndChild = pWndPrev->GetLastActivePopup();                 // If iconic, restore the main window.                 if (pWndPrev->IsIconic())                 pWndPrev->ShowWindow(SW_RESTORE);                 // Bring the main window or its popup to the foreground                 pWndChild->SetForegroundWindow();                 // and you are done activating the other application.                 return TRUE;         }         m_pMainWnd = &dlg;         int nResponse = dlg.DoModal();         if (nResponse == IDOK)         {                 // TODO: Place code here to handle when the dialog is                 //  dismissed with OK         }         else if (nResponse == IDCANCEL)         {                 // TODO: Place code here to handle when the dialog is                 //  dismissed with Cancel         }         // Since the dialog has been closed, return FALSE so that we exit the         //  application, rather than start the application's message pump.         return FALSE; }