用流读写结构化文件

 

 

unit Unit1; 
 
interface 
 
uses 
 Windows, Meages, SysUtils, Variants, Claes, Graphics, Controls, Forms, 
 Dialogs, StdCtrl 
 
type 
 TForm1 = cla(TForm) 

Memo1: TMemo;

{
添加 Memo 显示内容
}


Button1: TButto 

Button2: TButto 

procedure Button1Click(Sender: TObject); 

procedure Button2Click(Sender: TObject); 
 private 


{
Private declaratio 
}

 public 


{
Public declaratio 
}

 end; 
 
var 
 Form1: TForm1; 
 
implementation 
 
{$R *.dfm
}

 
type 
 TRec = record

{
定义一个记录
}


name: string[8]; 

age: Word; 
 end; 
 
 
//写入 
procedure TForm1.Button1Click(Sender: TObject); 
var 
 rec: TRec; 
 ms: TMemoryStream; 
begin 
 ms := TMemoryStream.Create; 
 
 rec.name := '张三'; rec.age := 8; 
 ms.Write(rec, SizeOf(rec)); 
 
 rec.name := '李四'; rec.age := 81; 
 ms.Write(rec, SizeOf(rec)); 
 
 rec.name := '王二麻子'; rec.age := 18; 
 ms.Write(rec, SizeOf(rec)); 
 
 ms.SaveToFile('c:/temp/rec.dat'); 
 
 ms.Free; 
end; 
 
 
//读取 
procedure TForm1.Button2Click(Sender: TObject); 
var 
 rec: TRec; 
 ms: TMemoryStream; 
begin 
 ms := TMemoryStream.Create; 
 ms.LoadFromFile('c:/temp/rec.dat'); 
 
 Memo1.Clear; 
 ms.Position := 0; 
 while ms.Position < ms.Size do 
 begin 

ms.Read(rec, SizeOf(rec)); 

Memo1.Lines.Add(rec.name + ' ' + IntToStr(rec.age)); 
 end; 

{
Memo1 的显示结果会是: 

张三 8 

李四 81 

王二麻子 18 
 
}

posted @ 2010-09-18 01:19  delphi中间件  阅读(261)  评论(0编辑  收藏  举报