Delphi中的“流”类[4]-遍历读取流中的所有数据

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 FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject); //先创建一个测试文件
var
list:TStringList;
begin
list:=TStringList.Create;
list.Add('ABCDEFGHIJKLMNOPQRSTUVWXYZ');
list.SaveToFile('f:\temp\test.txt');
list.Free;

Memo1.Lines.LoadFromFile('f:\temp\test.txt');
end;

procedure TForm1.Button1Click(Sender: TObject);
var
ms:TMemoryStream;
c:Char;
s1,s2:string;
begin
ms:=TMemoryStream.Create;
ms.LoadFromFile('f:\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}
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 + ' ';               {读出来的字符加上空格后追加到s1变量里}
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;

ms.Free;        {释放内存流对象 }
end;

end.