Delphi 2009 中 string 与 Char 的改变

本文整理自网络，侵删。

 
在 Delphi 2009 中:
string = UnicodeString; (同样: PString = PUnicodeString;)
Char = WideChar; (同样: PChar = PWideChar;)
本例效果图:


代码文件:
unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Memo1: TMemo;
    Edit1: TEdit;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Button5: TButton;
    Button6: TButton;
    Button7: TButton;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure Button6Click(Sender: TObject);
    procedure Button7Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  Memo1.Clear;
  Edit1.Alignment := taCenter;
  Edit1.Text := '''万一的 Delphi 博客''';
  Button1.Caption := 'string';
  Button2.Caption := 'AnsiString';
  Button3.Caption := 'WideString';
  Button4.Caption := 'Char';
  Button5.Caption := 'AnsiChar';
  Button6.Caption := 'WideChar';
  Button7.Caption := '清' + #10#10 + '空';
  Button7.WordWrap := True;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  str: string;
  i: Integer;
begin
  str := Edit1.Text;
  Memo1.Clear;
  for i := 1 to Length(str) do Memo1.Lines.Add(str[i]);
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  str: AnsiString;
  i: Integer;
begin
  str := Edit1.Text;
  Memo1.Clear;
  for i := 1 to Length(str) do Memo1.Lines.Add(str[i]);
end;

procedure TForm1.Button3Click(Sender: TObject);
var
  str: WideString;
  i: Integer;
begin
  str := Edit1.Text;
  Memo1.Clear;
  for i := 1 to Length(str) do Memo1.Lines.Add(str[i]);
end;

procedure TForm1.Button4Click(Sender: TObject);
var
  c: Char;
begin
  Memo1.Clear;
  for c in Edit1.Text do Memo1.Lines.Add(c);
end;

procedure TForm1.Button5Click(Sender: TObject);
var
  c: AnsiChar;
begin
  Memo1.Clear;
  for c in AnsiString(Edit1.Text) do Memo1.Lines.Add(c);
end;

procedure TForm1.Button6Click(Sender: TObject);
var
  c: WideChar;
begin
  Memo1.Clear;
  for c in Edit1.Text do Memo1.Lines.Add(c);
end;

procedure TForm1.Button7Click(Sender: TObject);
begin
  Memo1.Clear;
end;

end.

 

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