用 TBytesStream 类实现的读文件为十六进制字符的函数

本例效果图:

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代码文件:

---

unit Unit1;



interface



uses

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

  Dialogs, StdCtrls;



type

  TForm1 = class(TForm)

    Memo1: TMemo;

    Memo2: TMemo;

    Button1: TButton;

    procedure Button1Click(Sender: TObject);

    procedure FormCreate(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



{读文件为十六进制字符的函数}

function ReadFileToHex(FileName: string): string;

var

  bs: TBytesStream;

  i: Integer;

begin

  Result := '';

  if not FileExists(FileName) then Exit;



  bs := TBytesStream.Create;

  bs.LoadFromFile(FileName);

  for i := 0 to bs.Size - 1 do

    Result := Result + Format('%.2x ', [bs.Bytes[i]]);

  bs.Free;

end;



{测试}

procedure TForm1.Button1Click(Sender: TObject);

const

  FilePath = 'c:\temp\Text.txt';

begin

  Memo1.Lines.SaveToFile(FilePath);

  Memo2.Text := ReadFileToHex(FilePath);

end;



procedure TForm1.FormCreate(Sender: TObject);

begin

  Button1.Caption := '保存并读出十六进制 (注意读出的 0D 0A 是换行符)';

end;



end.


 
   

窗体文件:

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object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 149

  ClientWidth = 339

  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 = 160

    Height = 124

    Align = alLeft

    Lines.Strings = (

      'Memo1')

    ScrollBars = ssVertical

    TabOrder = 0

  end

  object Memo2: TMemo

    Left = 179

    Top = 0

    Width = 160

    Height = 124

    Align = alRight

    Lines.Strings = (

      'Memo2')

    ScrollBars = ssVertical

    TabOrder = 1

  end

  object Button1: TButton

    Left = 0

    Top = 124

    Width = 339

    Height = 25

    Align = alBottom

    Caption = 'Button1'

    TabOrder = 2

    OnClick = Button1Click

  end

end