MFC定位窗口焦点

// 把焦点定位到桌面端主界面
	{
		HWND hMainWnd = NULL;
		CLib_Global::GetAPI().pITools->GetWindowHandle(hMainWnd);
		FALSE_RETURN(NULL!=hMainWnd);
		CWnd *pWnd = CWnd::FromHandle(hMainWnd);
		if (pWnd != NULL && pWnd->GetParent() != NULL)
		{
			CDC dc;
			dc.Attach(::GetWindowDC(pWnd->GetParent()->GetSafeHwnd()));
			dc.GetWindow()->SetActiveWindow();
		}
		else
		{
			CDC dc;
			dc.Attach(::GetWindowDC(hMainWnd));
			dc.GetWindow()->SetActiveWindow();
		}
	}