Delphi ¾¿¾¹²úÉúÁ˼¸¸öString¶ÔÏóµÄÎÊÌâ
¼¼Êõ½»Á÷,DH½²½â. Õâ¸öÊÇÔÚCSDNÉÏÃæ¿´¼ûµÄÎÊÌâ.ÎÒ˵˵×Ô¼ºµÄÏë·¨. procedure TForm1.btn1Click(Sender: TObject);
var
Str:String;
begin
Str:='abc' ;
Str:=str+'d';
str:=copy(Str,1,3);
str:=UpperCase(str);
end;
ÎÊÌâ1´ð°¸:2010ÏÂ
Unit4.pas.29: begin
005144E0 55 push ebp
005144E1 8BEC mov ebp,esp
005144E3 6A00 push $00
005144E5 6A00 push $00
005144E7 33C0 xor eax,eax
005144E9 55 push ebp
005144EA 6856455100 push $00514556
005144EF 64FF30 push dword ptr fs:[eax]
005144F2 648920 mov fs:[eax],esp
Unit4.pas.30: Str:='abc' ;
005144F5 8D45FC lea eax,[ebp-$04]
005144F8 BA70455100 mov edx,$00514570 //Õâ¿éÄÚ´æÖдæ·ÅµÄÊÇ abc ×Ö·û´®¶ÔÏó
005144FD E8E631EFFF call @UStrLAsg //¸ú½øÕâ¸öº¯Êý,ÓÉÓÚabc¿é´¦±¾À´¾ÍÊÇUnicodeµÄ,ËùÒÔ²»ÐèҪת»»,Ö»ÊÇÒýÓôÎÊý¼ÓÒ»,Ò²¾ÍÊÇÕâÀïÊÇ ±àÒëÆ÷Ò»¿ªÊ¼¾Í²úÉúÁËÒ»¸ö abc ×Ö·û´®¶ÔÏó
Unit4.pas.32: Str:=str+'d';
00514502 8D45FC lea eax,[ebp-$04]
00514505 BA84455100 mov edx,$00514584 //ÀàËÆÕâÀïÊÇÒ»¸ö'd'µÄ×Ö·û´®¶ÔÏó,×ܹ²³öÏÖ2¸öÁË
0051450A E8A935EFFF call @UStrCat //»á¶Ôµ÷ÓÃUStrSetLength,eaxÊÇabcµØÖ·,edxÊÇ4,Ò²¾ÍÊÇÏȸøabcÀ©ÈÝ,¶øÕâ¸öº¯ÊýÀïÃæµ÷ÓÃÁËNewUnicodeString,»áвúÉúÒ»¸öabc×Ö·û´®¶ÔÏó¿Õ¼ä,È»ºóÔÚÕâ¸ö¶ÔÏó¿Õ¼äÉÏÓÃmov°ÑdÒƵ½abcÉÏÈ¥,ÐγÉabcd,µ½ÏÖÔÚ³öÏÖÁË3¸ö×Ö·û´®¶ÔÏóÁË.
Unit4.pas.34: str:=copy(Str,1,3);
0051450F 8D45FC lea eax,[ebp-$04] //´ÓÕâÒ»¾äÎÒÃÇÒ²¿ÉÒÔ¿´¼û¾Ö²¿±äÁ¿µÄÖ¸ÕëÒ²¸Ä±äλÖÃÁË
00514512 50 push eax
00514513 B903000000 mov ecx,$00000003
00514518 BA01000000 mov edx,$00000001
0051451D 8B45FC mov eax,[ebp-$04]
00514520 E8BF38EFFF call @UStrCopy //ÏÈÔö¼ÓÒ»´Î±»¸´ÖÆ×Ö·û´®µÄÒýÓôÎÊý,È»ºóÔÚUStrfromPWCharLenÖе÷ÓÃNewUnicodeStringÉêÇëÒ»¸ö¿Õ¼äΪ3µÄ×Ö·û´®¶ÔÏó,µØÖ·$00F2e02c,µÚ4¸öÁËÓ´,×îºóÉèÖúÃÆ«Òƺó,ÓÃMovº¯Êý½«abcÒƵ½Õâ¸ö¿Õ¼äÈ¥
Unit4.pas.36: str:=UpperCase(str);
00514525 8D55F8 lea edx,[ebp-$08] //Õâ¸öµØÖ·ÀïÃæÊÇʲô?Ó¦¸ÃÊÇ·
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