C++控制程序只运行一个实例

 int APIENTRY WinMain(HINSTANCE hInstance,
                      HINSTANCE hPrevInstance,
                      LPSTR     lpCmdLine,
                      int       nCmdShow)
 {
     HANDLE hMutex = CreateMutex(NULL, false, "win32program");
     if (GetLastError() == ERROR_ALREADY_EXISTS)
     {
         CloseHandle(hMutex);
         ::MessageBox(NULL, "程序已经在运行中，不能重复启动！", "提示", MB_OK +MB_ICONWARNING);
         return ;
     }
     do
     {
         Sleep();
     } while (true);
     return ;
 }