Friday, April 5, 2013

限制程式只能有一個執行個體?

[Reference] http://www.programmer-club.com.tw/ShowSameTitleN/cb/10992.html


在主程式 WinMain() 加入下面程式碼

WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
{
  HANDLE hMutex;
  // 設定互斥旗標所識別的應用程式名稱
  const char pProgName[]="~!@#$%^project1";
    try {
    // 取得互斥旗標的狀態
      hMutex=OpenMutex(MUTEX_ALL_ACCESS, false, pProgName);
      if ( NULL==hMutex ) {
      // 設定互斥旗標所識別的應用程式名稱
      hMutex=CreateMutex(NULL, true, pProgName);
    }
    else {
      // 系統中已開啟一份應用程式了,因此不啟動本程式
      return 0;
    }

    Application->Initialize();
    Application->CreateForm(__classid(TForm1), &Form1);
    Application->Run();
  }
  catch ( ... ) {
  ...
  }

  // **** 加入部份
  // 釋放互斥旗標
  return ReleaseMutex(hMutex);
}

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