// On suppose que hdc est un HDC correspondant a ta fenetre
HBITMAP hBitmp;
HDC hdcBitmap;
hBitmap = LoadBitmap(hdc, IDB_BITMAP);
hdcBitmap = CreateCompatibleDC(hdc);
SelectObject(hdcBitmap, hBitmap);
BitBlt(hdc, x, y, cx, cy, hdcBitmap, 0, 0, SRCCOPY);
DeleteObject(hdcBitmap)
DeleteObject(hBitmap)