汉字与多字节编码的转换 - 回复 "不知道" 的问题

问题来源: http://www.cnblogs.com/del/archive/2008/11/22/1284923.html#1378410

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Delphi 2009 默认的编码是多字节编码(MBCS), Delphi 这样表示它: TEncoding.Default.

下面是多字节编码与汉字之间转换的例子:

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unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls;



type

  TForm1 = class(TForm)

    Button1: TButton;

    Button2: TButton;

    Button3: TButton;

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(Sender: TObject);

    procedure Button3Click(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



{汉字到多字节编码}

procedure TForm1.Button1Click(Sender: TObject);

var

  stream: TStringStream;

  b: Byte;

  s: string;

begin

  stream := TStringStream.Create('我们', TEncoding.Default);

  s := '';

  for b in stream.Bytes do s := Format('%s%x ', [s,b]);



  ShowMessage(s); {CE D2 C3 C7}

  stream.Free;

end;



{多字节编码到汉字}

procedure TForm1.Button2Click(Sender: TObject);

var

  stream: TStringStream;

begin

  stream := TStringStream.Create;

  stream.Size := 4;

  stream.Bytes[0] := $CE; 

  stream.Bytes[1] := $D2;

  stream.Bytes[2] := $C3;

  stream.Bytes[3] := $C7;



  ShowMessage(stream.DataString); {我们}

  stream.Free;

end;



{把多字节编码的字符串转换到汉字}

procedure TForm1.Button3Click(Sender: TObject);

var

  str: AnsiString;

  stream: TStringStream;

  i: Integer;

begin

  str := 'CED2C3C7';

  stream := TStringStream.Create;

  stream.Size := Length(str) div 2;



  for i := 1 to Length(str) do

    if Odd(i) then

      stream.Bytes[i div 2] := StrToIntDef(Concat(#36,str[i],str[i+1]), 0);



  ShowMessage(stream.DataString); {我们}

  stream.Free;

end;



end.