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<! $Id: File.3,v 1.1 1996/07/17 01:39:25 stolcke Exp $><HTML><HEADER><TITLE>File</TITLE><BODY><H1>File</H1><H2> NAME </H2>File - Wrapper for stdio streams<H2> SYNOPSIS </H2><B> #include <File.h> </B><H2> DESCRIPTION </H2>The<B> File </B>class provides a simple wrapper around stdio streams for usewith C++.It provides two kinds of convenience:Firstly, constructors and destructors manage opening and closing of the stream.The stream is checked for errors on closing, and the default behavioris to exit() with an error message if a problem was found.Secondly, the getline() method can be used for line-oriented input.It strips comments and keeps track of input linenumbers for error reporting.<H2> CLASS MEMBERS </H2><DL><DT><B> File(const char *<I>name</I>, const char *<I>mode</I>, int <I>exitOnError</I> = 1) </B><DD><DT><B> File(FILE *<I>fp</I> = 0, int <I>exitOnError</I> = 1) </B><DD>A File object can be initialized with either a filename or an existingstdio stream.In the first case, the file is opened according to <I>mode</I>(as if by<A HREF="fopen.html">fopen(3)</A>).The <I>exitOnError</I> flag determines whether I/O errors should be treatedas fatal.<DT><B> ~File() </B><DD>Destroying a File object implies closing the associated stream.<DT><B> char *getline() </B><DD>Returns the next line from the input, stored in a static buffer of up to <B>maxLineLength</B> characters.Empty lines and lines starting with <B>#</B> are skipped.<DT><B> int close() </B><DD>Closes the stream without destroying the File object.Returns non-zero is an error condition occurs.<DT><B> int error() </B><DD>Returns a non-zero value if an error condition occurred on the stream.<DT><B> operator FILE *() </B><DD>A File object can be cast to <B>FILE *</B> to access the underlying stdiostream.<DT><B> ostream &position(ostream &<I>stream</I> = cerr) </B><DD>Outputs the current line number on <I>stream</I>.The <I>stream</I> is returned so it can be used as the left operandof the <B><<</B> operator.<DT><B> const char *name </B><DD>The filename used in creating the File object.<DT><B> const unsigned lineno </B><DD>The current line number as maintained by <B>getline()</B>.<DT><B> int exitOnError </B><DD>When set to <B>true</B> this causes errors on thestream to be handled by program termination (after printing anerror message).</DD></DL><H2> SEE ALSO </H2><A HREF="stdio.html">stdio(3)</A><H2> BUGS </H2>Many other potentially useful functions are not provided (yet).<H2> AUTHOR </H2>Andreas Stolcke <stolcke@speech.sri.com>.<BR>Copyright 1995, 1996 SRI International</BODY></HTML>⌨️ 快捷键说明
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