把流中的字符串转换为 UTF 格式 - 回复 "lostapple" 的问题

问题来源: http://www.cnblogs.com/del/archive/2008/12/26/1269606.html#1414232

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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)

    Button1: TButton;

    Memo1: TMemo;

    procedure Button1Click(Sender: TObject);

    procedure FormCreate(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



procedure TForm1.Button1Click(Sender: TObject);

var

  stream1,stream2: TStringStream;

  b: Byte;

  bs: string;

begin

  {建立第一个流, 使用默认的双字节编码; 流中的数据是 Memo 中的字符串}

  stream1 := TStringStream.Create(Memo1.Text, 54936);



  {把第一个流的十六进制编码显示在 Memo 中}

  bs := '';

  for b in stream1.Bytes do bs := Format(bs + '%2x ', [b]);

  Memo1.Lines.Add(bs);



  {建立第二个流, 用 UTF8 编码; 还是基于第一个流中的字符串}

  stream2 := TStringStream.Create(stream1.DataString, TEncoding.UTF8);



  {把第二个流的十六进制编码显示在 Memo 中}

  bs := '';

  for b in stream2.Bytes do bs := Format(bs + '%2x ', [b]);

  Memo1.Lines.Add(bs);



  stream1.Free;

  stream2.Free;

end;



procedure TForm1.FormCreate(Sender: TObject);

begin

  Memo1.Align := alTop;

  Memo1.ScrollBars := ssBoth;

  Memo1.Text := '万一的 Delphi 博客';

end;



end.


 
   

窗体文件:

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object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 146

  ClientWidth = 406

  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 Button1: TButton

    Left = 323

    Top = 113

    Width = 75

    Height = 25

    Caption = 'Button1'

    TabOrder = 0

    OnClick = Button1Click

  end

  object Memo1: TMemo

    Left = 8

    Top = 8

    Width = 313

    Height = 105

    Lines.Strings = (

      'Memo1')

    TabOrder = 1

  end

end