关于 Delphi 中流的使用(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; {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}
? 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.
