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.