Delphi 2009 中 string 与 Char 的改变

在 Delphi 2009 中:

string = UnicodeString; (同样: PString = PUnicodeString;)

Char = WideChar; (同样: PChar = PWideChar;)

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本例效果图:

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代码文件:

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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.

窗体文件:

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object Form1: TForm1
  Left = 0
  Top = 0
  Caption = 'Form1'
  ClientHeight = 223
  ClientWidth = 256
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  OldCreateOrder = False
  OnCreate = FormCreate
  PixelsPerInch = 96
  TextHeight = 13
  object Memo1: TMemo
    Left = 0
    Top = 0
    Width = 73
    Height = 223
    Align = alLeft
    Font.Charset = DEFAULT_CHARSET
    Font.Color = clWindowText
    Font.Height = -11
    Font.Name = 'Tahoma'
    Font.Style = []
    Lines.Strings = (
      'Memo1')
    ParentFont = False
    TabOrder = 0
    ExplicitHeight = 174
  end
  object Edit1: TEdit
    Left = 79
    Top = 11
    Width = 170
    Height = 21
    TabOrder = 1
    Text = 'Edit1'
  end
  object Button1: TButton
    Left = 79
    Top = 38
    Width = 121
    Height = 25
    Caption = 'Button1'
    TabOrder = 2
    OnClick = Button1Click
  end
  object Button2: TButton
    Left = 79
    Top = 69
    Width = 121
    Height = 25
    Caption = 'Button2'
    TabOrder = 3
    OnClick = Button2Click
  end
  object Button3: TButton
    Left = 79
    Top = 100
    Width = 121
    Height = 25
    Caption = 'Button3'
    TabOrder = 4
    OnClick = Button3Click
  end
  object Button4: TButton
    Left = 79
    Top = 131
    Width = 121
    Height = 25
    Caption = 'Button4'
    TabOrder = 5
    OnClick = Button4Click
  end
  object Button5: TButton
    Left = 79
    Top = 162
    Width = 121
    Height = 25
    Caption = 'Button5'
    TabOrder = 6
    OnClick = Button5Click
  end
  object Button6: TButton
    Left = 79
    Top = 191
    Width = 121
    Height = 25
    Caption = 'Button6'
    TabOrder = 7
    OnClick = Button6Click
  end
  object Button7: TButton
    Left = 201
    Top = 38
    Width = 48
    Height = 178
    Caption = 'Button7'
    TabOrder = 8
    OnClick = Button7Click
  end
end