WinAPI 字符及字符串函数(15): CharNext、CharPrev

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}



procedure TForm1.Button1Click(Sender: TObject);

var

  p: PChar;

begin

  p := '2009';

  p := CharNext(p);

  ShowMessage(p); {009}



  p := '博客';

  p := CharNext(p);

  ShowMessage(p); {客}

end;



procedure TForm1.Button2Click(Sender: TObject);

var

  p,px: PChar;

begin

  p := '2009';

  px := CharNext(p);

  px := CharNext(px);



  ShowMessage(px); {09}



  px := CharPrev(p, px);

  px := CharPrev(p, px);

  ShowMessage(px); {2009}

end;



end.