已知bitmap句柄如何显示在指定画布上(50分)

已知bitmap句柄，想用BitBlt复制到一个指定的地方
nHBITMAP是一个已知的bitmap句柄
BitBlt(GetDC(0),0,0,16,16,GetDC(nHBITMAP),0,0,SRCCOPY);
显示不出来

var
dc,dcTmp:HDC;
begin
...
dc:=GetDC(0);
dcTmp:=CreateCompatibleDC(dc);
SelectObject(dcTmp,nHBITMAP);
BitBlt(dc,0,0,16,16,dcTmp,0,0,SRCCOPY);
ReleaseDC(0,dc);
DeleteDC(dcTmp);
...
end;

接受答案了.