SysUtils.StrEnd、SysUtils.StrLen

StrEnd 获取 PChar 串未指针; StrLen 获取 PChar 串长度.

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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}



//StrEnd:

procedure TForm1.Button1Click(Sender: TObject);

var

  p: PChar;

  str: string;

begin

  str := '123456789';

  p := StrEnd(PChar(str));

  ShowMessage(p-3); {789}

end;



//StrLen:

procedure TForm1.Button2Click(Sender: TObject);

var

  p: PChar;

  i: Integer;

begin

  p := '123456789';



  i := StrLen(p);

  ShowMessage(IntToStr(i)); {9}



  i := Length(p);

  ShowMessage(IntToStr(i)); {9}

end;



end.


 
   

SysUtils 单元下的公用函数目录

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