Win32判断当前进程是否激活（失去焦点）

DWORD GetCurrentActiveWindowsProcessId()  {    HWND hWnd = GetActiveWindow();    DWORD processId = 0;    GetWindowThreadProcessId(hWnd, &processId);    return processId;  }  BOOL HasFocus() {  DWORD active_process = GetCurrentActiveWindowsProcessId();  DWORD current_process = ::GetCurrentProcessId();

  return current_process ==  active_process ;

}