subject_38743.htm

vc

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序号：38743 发表者：foolish 发表日期：2003-05-05 21:39:47
<br>主题：如何得到文件的大小
<br>内容：&nbsp;&nbsp; 如何直接得到文件的大小。谢了。
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<font color=red>答案被接受</font><br>回复者：擎天柱 回复日期：2003-05-05 21:48:52
<br>内容：/* CHSIZE.C: This program uses _filelength to report the size<BR> * of a file before and after modifying it with _chsize.<BR> */<BR><BR>#include &lt;io.h&gt;<BR>#include &lt;fcntl.h&gt;<BR>#include &lt;sys/types.h&gt;<BR>#include &lt;sys/stat.h&gt;<BR>#include &lt;stdio.h&gt;<BR><BR>void main( void )<BR>{<BR>&nbsp;&nbsp; int fh, result;<BR>&nbsp;&nbsp; unsigned int nbytes = BUFSIZ;<BR><BR>&nbsp;&nbsp; /* Open a file */<BR>&nbsp;&nbsp; if( (fh = _open( "data", _O_RDWR | _O_CREAT, _S_IREAD <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | _S_IWRITE ))&nbsp;&nbsp;!= -1 )<BR>&nbsp;&nbsp; {<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;printf( "File length before: %ld\n", _filelength( fh ) );<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if( ( result = _chsize( fh, 329678 ) ) == 0 )<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf( "Size successfully changed\n" );<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;else<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf( "Problem in changing the size\n" );<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;printf( "File length after:&nbsp;&nbsp;%ld\n", _filelength( fh ) );<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;_close( fh );<BR>&nbsp;&nbsp; }<BR>}<BR>
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