SysUtils.StrScan、SysUtils.StrRScan、SysUtils.StrPos

StrScan  : 返回一个字符在一个 PChar 串中第一次出现的位置指针;

StrRScan : 返回一个字符在一个 PChar 串中最后一次出现的位置指针;

StrPos   : 返回一个 PChar 串在另一个 PChar 串中第一次出现的位置指针.


 
   

unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls;



type

  TForm1 = class(TForm)

    Button1: TButton;

    Button2: TButton;

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



//StrScan、StrRScan:

procedure TForm1.Button1Click(Sender: TObject);

var

  p: PChar;

  str: string;

begin

  str := 'ABCBBBCBA';

  p := StrScan(PChar(str), 'B');

  ShowMessage(p);  {BCBBBCBA}



  p := StrRScan(PChar(str), 'B');

  ShowMessage(p);  {BA}

end;



//StrPos:

procedure TForm1.Button2Click(Sender: TObject);

var

  p: PChar;

  str: string;

begin

  str := '123456789';

  p := StrPos(PChar(str), '456');

  ShowMessage(p); {456789}

end;



end.


 
   

SysUtils 单元下的公用函数目录

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