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¹ØÓÚdelphi Moveº¯ÊýµÄÓ÷¨Ïê½â

ʹÓÃdelphi¶àÄê,ǰЩÌìºöÈ»Óöµ½²»»ástringתpbyte,ºÜÊÇʧÂä,´Ëʱ¶ÔÓÚ±à³Ì»ù±¾¹¦µÄÖØÒªÐÔÉîÓÐÌå»á.ÕâÆäÖÐÓõ½MOVEº¯Êý.
ʹÓÃdelphi¶àÄê,ǰЩÌìºöÈ»Óöµ½²»»ástringתpbyte,ºÜÊÇʧÂä,´Ëʱ¶ÔÓÚ±à³Ì»ù±¾¹¦µÄÖØÒªÐÔÉîÓÐÌå»á.ÕâÆäÖÐÓõ½MOVEº¯Êý.
 ¸ãÁ˺ÃÒ»»á²Å¸ãÃ÷°×ÆäÓ÷¨.ËùÒÔÏëÌù³öÀ´°ïÖúÐèÒª°ïÖúµÄÈË.
var
   s:string;
   ps:Pchar;
   b:pbyte;
   len:integer;
begin
   s:=edit1.Text; //×Ö·û´®
   ps:=pchar(s); //ת³ÉpcharÀàÐÍ,
   len:=length(s);//È¡×Ö·û´®³¤¶È,Õ¼ÓöàÉÙ×Ö½Ú
   getmem(b,len);//ÉêÇëÄÚ´æ,pchar,pbyteÔÚʹÓÃǰ¶¼±ØÐëÒªÉêÇëÄÚ´æ,ÒòΪËûÃÇÊÇÖ¸Õë.
   move(ps^,b^,len);//ÕâÀï ps^Òâ˼ÊÇpcharÖ¸ÏòÄÚ´æÊý¾ÝµÄµÚÒ»¸ö×Ö½ÚµØÖ·,B^ÊDZíʾÉêÇëÄÚ´æµÄµÚÒ»¸ö×Ö½ÚµØÖ·,ÕâÑù¾Í¿ÉÒÔÒ»¸öÒ»¸ö×Ö½ÚµÄÒÆµ½bÀïÈ¥ÁË.
   memo1.Text:=pchar(b);//ÏÔʾ.
   freemem(b);
end;
ÓÐЩÈËÓöµ½µÄÀ§»óÊÇΪʲô move(s,b,len)²»ÐÐÄØ?ͬÑùÎÒÒ²Óöµ½ÕâÑùµÄÀ§»ó.
¿´ÁËÒ»ÑùmoveµÄº¯ÊýÔ´Âë²ÅÃ÷°×.
procedure       Move( const Source; var Dest; count : Integer );
{$IFDEF PUREPASCAL}
var
  S, D: PChar;
  I: Integer;
begin
  S := PChar(@Source);//È¡ÄÚ´æµØÖ·
  D := PChar(@Dest);//È¡ÄÚ´æµØÖ·
  if S = D then Exit;
  if Cardinal(D) > Cardinal(S) then
    for I := count-1 downto 0 do
      D[I] := S[I]
  else
    for I := 0 to count-1 do
      D[I] := S[I];
end;
Èç¹ûÖ±½Ó´«Èës,
 
S := PChar(@Source);//È¡ÄÚ´æµØÖ·\
 ¾ÍÏ൱ÓÚÈ¡µÄ×Ö·û´®SµØÖ·µÄµØÖ·.
Èç¹û´«ÈëµÄÊÇps^
S := PChar(@Source);//È¡ÄÚ´æµØÖ·
 ¾ÍÏ൱ÓÚÈ¡pchar ËùÖ¸Ïò×Ö·û´®Êµ¼ÊÊý¾ÝµÄµØÖ·.
±¾ÆªÎÄÕÂÀ´Ô´ÓÚ£º¿ª·¢Ñ§Ôº http://edu.codepub.com   Ô­ÎÄÁ´½Ó£ºhttp://edu.codepub.com/2010/0120/19934.php


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  Form1.ShowModal;
  Form1.Free;
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