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CBitmap bmp;
int x1,y1,x2,y2;
CDC memdc;
BITMAP bm;
memdc.CreateCompatibleDC(NULL);
bmp.m_hObject = (HBITMAP)LoadImage(NULL,"F:\\software\\19.bmp",IMAGE_BITMAP,0,0,LR_LOADFROMFILE);
bmp.GetObject(sizeof(bm),&bm);
memdc.SelectObject(bmp);
pDC->StretchBlt(0,0,x2-x1,y2-y1,&memdc,x1,y1,x2-x1,y2-y1,SRCCOPY);