unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls; type TForm1 = class(TForm) Memo1: TMemo; Memo2: TMemo; {需要添加两个 Memo 用于显示} Button1: TButton; procedure Button1Click(Sender: TObject); procedure FormCreate(Sender: TObject); end; var Form1: TForm1; implementation {$R *.dfm} //先制造一个测试文件 procedure TForm1.FormCreate(Sender: TObject); var strList: TStringList; begin strList := TStringList.Create; strList.Add('ABCDEFGHIJKLMNOPQRSTUVWXYZ'); strList.SaveToFile('c:\temp\test.txt'); strList.Free; end; procedure TForm1.Button1Click(Sender: TObject); var ms: TMemoryStream; c: Char; s1,s2: string; begin ms := TMemoryStream.Create; ms.LoadFromFile('c:\temp\test.txt'); {读入内存流} s1 := ''; s2 := ''; ms.Position := 0; {指针到开始} while ms.Position < ms.Size do {循环读出; 应该写作 while ms.Read(c,1) > 0 do } begin ms.Read(c,1); {每读出一个字节, 指针会自动移到新的位置} s1 := s1 + c + ' '; {用文本记录} s2 := s2 + IntToHex(Byte(c),2) + ' '; {用两位数的十六进制记录} end; Memo1.Lines.Text := s1; Memo2.Lines.Text := s2; {Memo1 会显示: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z } {Memo2 会显示: 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54 55 56 57 58 59 5A 0D 0A} ms.Free; end; end. |
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