读十六进制文本到 Btye 数组的函数 - 回复 "峰哥！！！" 的问题

问题来源: http://www.cnblogs.com/del/archive/2009/03/10/1407220.html#1472741

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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);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

{把十六进制文本载入一个 Byte 数组的函数}
procedure HexToArr(const FileName: string; var arr: TBytes);
var
  str: string;
  count: Integer;
  i: Integer;
begin
  if not FileExists(FileName) then Exit;
  with TStringList.Create do begin
    LoadFromFile(FileName);
    str := Text;
    Free;
  end;
  str := StringReplace(str, ' ', '', [rfReplaceAll]); {清除空格}
  count := Length(str);
  SetLength(arr, (count-1) div 2);
  for i := 0 to count - 2 do if Odd(i) then
    arr[i div 2] := StrToIntDef('$' + str[i] + str[i+1], 1);
end;

{测试}
procedure TForm1.Button1Click(Sender: TObject);
const
  HexTxtFile = 'c:\temp\Hex.txt'; {一定要是十六进制的文本格式, 由 0-F 十六个字符组成的}
var
  MyArr: TBytes;
  str: string;
  i: Integer;
begin
  {调用函数}
  HexToArr(HexTxtFile, MyArr);

  {在 Memo 中看看, 落实下}
  str := '';
  for i := 0 to Length(MyArr) - 1 do
    str := str + Format('%.2x ', [MyArr[i]]);
  Memo1.Text := TrimRight(str);
end;

end.

窗体文件:

---

object Form1: TForm1
  Left = 0
  Top = 0
  Caption = 'Form1'
  ClientHeight = 136
  ClientWidth = 317
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  OldCreateOrder = False
  PixelsPerInch = 96
  TextHeight = 13
  object Button1: TButton
    Left = 234
    Top = 103
    Width = 75
    Height = 25
    Caption = 'Button1'
    TabOrder = 0
    OnClick = Button1Click
  end
  object Memo1: TMemo
    Left = 0
    Top = 0
    Width = 317
    Height = 97
    Align = alTop
    Lines.Strings = (
      'Memo1')
    ScrollBars = ssBoth
    TabOrder = 1
  end
end