MFC绘图问题。

Question

        CPaintDC dc(this);
        CDC memdc;
        HBITMAP bmp;
        CBitmap hbmp;
        memdc.CreateCompatibleDC(&dc);
        bmp =(HBITMAP)::LoadImage(NULL,"fg.bmp",IMAGE_BITMAP,0,0,LR_LOADFROMFILE|LR_CREATEDIBSECTION);
        hbmp.Attach(&bmp);
memdc.SelectObject(hbmp);
        dc.BitBlt(0,0,500,500,&memdc,0,0,SRCCOPY);请问这段代码有错么？
为什么就是不能画在对话框上？

Answer 1

CPaintDC dc(this);
CDC memdc;
HBITMAP bmp;
memdc.CreateCompatibleDC(&dc);
bmp =(HBITMAP)::LoadImage(AfxGetInstanceHandle(), _T("F:\\11.bmp"), IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE | LR_DEFAULTCOLOR | LR_DEFAULTSIZE);
ASSERT(bmp);
HBITMAP pOldbmp = (HBITMAP)memdc.SelectObject(bmp);
dc.BitBlt(0, 0, 500, 500, &memdc, 0, 0,SRCCOPY);
memdc.SelectObject(pOldbmp);
DeleteObject(bmp);
memdc.DeleteDC();