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<td width="68%" background="DDl_back2.jpg" height="44"><big><big><font face="黑体"><p align="center">         Delphi编程                            (BM: strayli FlyingBoy)          </font></big></big></td></tr>
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<tr><td width="100%" colspan="2" height="454">　<p align="center">[<a href="index.htm">回到开始</a>][<a href="4.htm">上一层</a>][<a href="125.htm">下一篇</a>]
<hr><p align="left"><small>发信人: seader (海哥), 信区: Delphi <br>

标  题: 文件管理 <br>

发信站: BBS 水木清华站 (Fri Oct  9 21:34:28 1998) WWW-POST <br>

  <br>

一 读出文件的长度 <br>

  <br>

var <br>

   f: file of Byte; <br>

   size : Longint; <br>

begin <br>

     AssignFile(f, 'f:\t.exe'); <br>

     Reset(f); <br>

     size := FileSize(f); <br>

     edit1.text := IntToStr(size); <br>

     CloseFile(f); <br>

end; <br>

或: <br>

var <br>

 fh:integer; <br>

 fs:longint; <br>

begin <br>

 fh:=fileopen('文件名',fmopenread); <br>

 fs:=fileseek(fh,0,2); <br>



 fileclose(fh); <br>

end; <br>

  <br>

  <br>

二 将字符串用二进制模式写入文件 <br>

  <br>

var <br>

 filehandle:integer; <br>

 filename:string; <br>

 fn:string; <br>

begin <br>

 filehandle:=fileopen(filename,fmopenreadwrite); <br>

 fileseek(filehandle,i*256,0); <br>

 getmem(buffer,300); <br>

  try <br>

    strpcopy(buffer,fn); <br>

    filewrite(filehandle,buffer^,256); <br>

   finally <br>

    freemem(buffer); <br>

   end; <br>

 fileclose(filehandle); <br>

end; <br>

end; <br>

  <br>

  <br>

三 使用readln()从文件中读出超过255字符的字串 <br>

  <br>

 Type <br>

   {use longest line you may encounter here} <br>

   TLine = Array [0..1024] of Char; <br>

   PLine = ^TLine; <br>

 Var <br>

   pBuf: PLine; <br>

 ... <br>

   New( pBuf ); <br>

 ... <br>

   ReadLn( F, pBuf^ ); <br>

  <br>

四 向文本文件后追加一行 <br>

  <br>

var <br>

   filevar: textfile; <br>

   buf:string; <br>

begin <br>

  assignfile(filevar,'txt.log'); <br>



  append(filevar); <br>

  writeln(filevar,buf); <br>

  closefile(filevar); <br>

end; <br>

-- <br>

  <br>

                   快乐的海哥 <br>

  <br>

※ 来源:·BBS 水木清华站 bbs.net.tsinghua.edu.cn·[FROM: 166.111.5.44] <br>

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