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var
    bmp, difbmp: TBitmap;//Á½¸öÓÃÓÚ±£´æÆÁĻͼÏóµÄÁÙʱλͼ¶ÔÏó
R        : TRect;//ÓÃÓÚ±£´æ×¥È¡·¶Î§µÄÒ»¸öTrect¶ÔÏó
tmp      : string;//ÓÃÓÚ±£´æÑ¹ËõºóµÄÊý¾ÝµÄ±äÁ¿
¡­¡­¡­¡­¡­¡­¡­..
CatchScreen(bmp, PixelFormat);//°´Ö¸¶¨µÄPixelFormatץȡȫÆÁ²¢½«Æä´æ·ÅÓÚbmpÖÐ
difbmp := TBitmap.Create;
difbmp.Assign(bmp);//½«bmpÖеÄλͼ´«µÝ¸ødifbmp
R := Rect(0, 0, difbmp.Width, difbmp.Height);//Ö¸¶¨¿½ÆÁ·¶Î§
difbmp.Canvas.CopyMode := cmSrcInvert;//ÉèÖÿ½±´Ä£Ê½ÎªcmSrcInvert£¬·Ç³£ÖØÒª
difbmp.Canvas.CopyRect(R, CurBmp.Canvas, R);//½«µ±Ç°Í¼ÏóÓëÉÏÒ»´ÎµÄͼÏó½øÐÐXORÔËË㣬½«½á¹ûλͼ´æ·ÅÓÚdifbmpÖУ¬ÆäÖÐCurBmpÊÇÒ»¸öÈ«¾Ö±äÁ¿£¬´æ·ÅµÄÊÇÉÏÒ»´Î×¥ÆÁʱµÄÆÁĻͼÏó
CompressBitmap(difbmp, tmp);//½«difbmp½øÐÐѹËõ£¬Ñ¹ËõºóµÄÊý¾Ý´æ·ÅÓÚtmpÖÐ
CurBmp.Assign(bmp);//µ±Ç°Í¼Ïó´æÈëCurBmp£¬ÏÂÒ»´Î×¥ÆÁʱ½øÐÐXORÔËËãʹÓÃ

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