在onpain()函数中
CDC *pDC = GetDC();
CDC memDC;
memDC.CreateCompatibleDC(pDC);
Cbitmap bmp;
bmp.LoadBitmap(你的图片ID);
CBitmap *pOldBitmp = memDC.SelectObject(&bmp);
Crect Rect(0,0,0,0);
GetClientRect(&Rect);
pDC->BitBlt(0,0,Rect.Width(),Rect.Height(), &memDC,0,0,SRCCOPY);
memDC.SelectObject(pOldBitmp);
memDC.DeleteDC();
ReleaseDC(pDC);