限制程序创建多实例的代码

 WCHAR strAppName[] = _T("SETUP");
 
 HANDLE hMutex = NULL;
 
 hMutex = CreateMutex(NULL, FALSE, strAppName);
 
 if(GetLastError() == ERROR_ALREADY_EXISTS)
 {
  CloseHandle(hMutex);
  
  return FALSE;
 }