显示问题.请教

	UpdateData(FALSE);

	m_ListCtrl2.SetItemState(iIndex,LVIS_SELECTED,LVIS_SELECTED);



	CString strName;



	int cx=GetSystemMetrics(SM_CXSCREEN);

	int cy=GetSystemMetrics(SM_CYSCREEN);



	strName="D:\\PatternList\\try.bmp";



	CWindowDC dc(NULL);

	//获得//BMP文件

	HBITMAP   hbitmap=(HBITMAP)::LoadImage(NULL,strName,IMAGE_BITMAP,0,0,LR_LOADFROMFILE);

	CBitmap   bBmp;   

	CDC   dcMemory;



	bBmp.Attach(hbitmap); 

	dcMemory.CreateCompatibleDC(&dc);  

         dcMemory.SelectObject(&bBmp);  

	//获得bmp文件的宽高

	BITMAP bm;

	bBmp.GetBitmap(&bm);

	

	

	dc.StretchBlt(0,0,cx,cy,&dcMemory,0,0,bm.bmWidth,bm.bmHeight,SRCCOPY);

	bBmp.DeleteObject();