编程技巧15法之三[8]

            bi.bisizeimage = (bi.bisizeimage * 3) / 2;

    }

    //重新分配内存大小，以便放下所有数据

    dwlen += bi.bisizeimage;

    handle = globalrealloc(hdib, dwlen, gmem_moveable) ;

    if (handle != null)

        hdib = handle;

    else

        {

        globalfree(hdib);

        //重选原始调色板

        selectpalette(hdc,hpal,false);

        ::releasedc(null,hdc);

        return null;

        }

    //获取位图数据

    lpbi = (lpbitmapinfoheader)hdib;

    //最终获得的dib

    bool bgotbits = getdibits( hdc, (hbitmap)bitmap.getsafehandle(),

                0l,                      //扫描行起始处

                (dword)bi.biheight,      //扫描行数

                (lpbyte)lpbi             //位图数据地址

                + (bi.bisize + ncolors * sizeof(rgbquad)),