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            <h1>FileHandle</h1>


  <!--    -->
<ul><li><a href="#NAME">NAME</a><li><a href="#SYNOPSIS">SYNOPSIS</a><li><a href="#DESCRIPTION">DESCRIPTION</a><li><a href="#SEE-ALSO">SEE ALSO</a></ul><a name="NAME"></a><h1>NAME</h1>
<p>FileHandle - supply object methods for filehandles</p>
<a name="SYNOPSIS"></a><h1>SYNOPSIS</h1>
<pre class="verbatim"><ol><li>    <a class="l_k" href="functions/use.html">use</a> <span class="w">FileHandle</span><span class="sc">;</span></li><li></li><li>    <span class="i">$fh</span> = <span class="w">FileHandle</span><span class="w">-&gt;new</span><span class="sc">;</span></li><li>    if <span class="s">(</span><span class="i">$fh</span><span class="i">-&gt;open</span><span class="s">(</span><span class="q">&quot;&lt; file&quot;</span><span class="s">)</span><span class="s">)</span> <span class="s">{</span></li><li>        <a class="l_k" href="functions/print.html">print</a> <span class="q">&lt;$fh&gt;</span><span class="sc">;</span></li><li>        <span class="i">$fh</span><span class="i">-&gt;close</span><span class="sc">;</span></li><li>    <span class="s">}</span></li><li></li><li>    <span class="i">$fh</span> = <span class="w">FileHandle</span><span class="w">-&gt;new</span><span class="s">(</span><span class="q">&quot;&gt; FOO&quot;</span><span class="s">)</span><span class="sc">;</span></li><li>    if <span class="s">(</span><a class="l_k" href="functions/defined.html">defined</a> <span class="i">$fh</span><span class="s">)</span> <span class="s">{</span></li><li>        <a class="l_k" href="functions/print.html">print</a> <span class="i">$fh</span> <span class="q">&quot;bar\n&quot;</span><span class="sc">;</span></li><li>        <span class="i">$fh</span><span class="i">-&gt;close</span><span class="sc">;</span></li><li>    <span class="s">}</span></li><li></li><li>    <span class="i">$fh</span> = <span class="w">FileHandle</span><span class="w">-&gt;new</span><span class="s">(</span><span class="q">&quot;file&quot;</span><span class="cm">,</span> <span class="q">&quot;r&quot;</span><span class="s">)</span><span class="sc">;</span></li><li>    if <span class="s">(</span><a class="l_k" href="functions/defined.html">defined</a> <span class="i">$fh</span><span class="s">)</span> <span class="s">{</span></li><li>        <a class="l_k" href="functions/print.html">print</a> <span class="q">&lt;$fh&gt;</span><span class="sc">;</span></li><li>        <a class="l_k" href="functions/undef.html">undef</a> <span class="i">$fh</span><span class="sc">;</span>       <span class="c"># automatically closes the file</span></li><li>    <span class="s">}</span></li><li></li><li>    <span class="i">$fh</span> = <span class="w">FileHandle</span><span class="w">-&gt;new</span><span class="s">(</span><span class="q">&quot;file&quot;</span><span class="cm">,</span> <span class="w">O_WRONLY</span>|<span class="w">O_APPEND</span><span class="s">)</span><span class="sc">;</span></li><li>    if <span class="s">(</span><a class="l_k" href="functions/defined.html">defined</a> <span class="i">$fh</span><span class="s">)</span> <span class="s">{</span></li><li>        <a class="l_k" href="functions/print.html">print</a> <span class="i">$fh</span> <span class="q">&quot;corge\n&quot;</span><span class="sc">;</span></li><li>        <a class="l_k" href="functions/undef.html">undef</a> <span class="i">$fh</span><span class="sc">;</span>       <span class="c"># automatically closes the file</span></li><li>    <span class="s">}</span></li><li></li><li>    <span class="i">$pos</span> = <span class="i">$fh</span><span class="i">-&gt;getpos</span><span class="sc">;</span></li><li>    <span class="i">$fh</span><span class="i">-&gt;setpos</span><span class="s">(</span><span class="i">$pos</span><span class="s">)</span><span class="sc">;</span></li><li></li><li>    <span class="i">$fh</span><span class="i">-&gt;setvbuf</span><span class="s">(</span><span class="i">$buffer_var</span><span class="cm">,</span> <span class="w">_IOLBF</span><span class="cm">,</span> <span class="n">1024</span><span class="s">)</span><span class="sc">;</span></li><li></li><li>    <span class="s">(</span><span class="i">$readfh</span><span class="cm">,</span> <span class="i">$writefh</span><span class="s">)</span> = <span class="w">FileHandle::pipe</span><span class="sc">;</span></li><li></li><li>    <span class="w">autoflush</span> <span class="w">STDOUT</span> <span class="n">1</span><span class="sc">;</span></li></ol></pre><a name="DESCRIPTION"></a><h1>DESCRIPTION</h1>
<p>NOTE: This class is now a front-end to the IO::* classes.</p>
<p><code class="inline"><span class="w">FileHandle::new</span></code>
 creates a <code class="inline"><span class="w">FileHandle</span></code>
, which is a reference to a
newly created symbol (see the <code class="inline"><span class="w">Symbol</span></code>
 package).  If it receives any
parameters, they are passed to <code class="inline"><span class="w">FileHandle::open</span></code>
; if the open fails,
the <code class="inline"><span class="w">FileHandle</span></code>
 object is destroyed.  Otherwise, it is returned to
the caller.</p>
<p><code class="inline"><span class="w">FileHandle::new_from_fd</span></code>
 creates a <code class="inline"><span class="w">FileHandle</span></code>
 like <code class="inline"><span class="w">new</span></code>
 does.
It requires two parameters, which are passed to <code class="inline"><span class="w">FileHandle::fdopen</span></code>
;
if the fdopen fails, the <code class="inline"><span class="w">FileHandle</span></code>
 object is destroyed.
Otherwise, it is returned to the caller.</p>
<p><code class="inline"><span class="w">FileHandle::open</span></code>
 accepts one parameter or two.  With one parameter,
it is just a front end for the built-in <code class="inline"><a class="l_k" href="functions/open.html">open</a></code> function.  With two
parameters, the first parameter is a filename that may include
whitespace or other special characters, and the second parameter is
the open mode, optionally followed by a file permission value.</p>
<p>If <code class="inline"><span class="w">FileHandle::open</span></code>
 receives a Perl mode string ("&gt;", "+&lt;", etc.)
or a POSIX fopen() mode string ("w", "r+", etc.), it uses the basic
Perl <code class="inline"><a class="l_k" href="functions/open.html">open</a></code> operator.</p>
<p>If <code class="inline"><span class="w">FileHandle::open</span></code>
 is given a numeric mode, it passes that mode
and the optional permissions value to the Perl <code class="inline"><a class="l_k" href="functions/sysopen.html">sysopen</a></code> operator.
For convenience, <code class="inline"><span class="w">FileHandle::import</span></code>
 tries to import the O_XXX
constants from the Fcntl module.  If dynamic loading is not available,
this may fail, but the rest of FileHandle will still work.</p>
<p><code class="inline"><span class="w">FileHandle::fdopen</span></code>
 is like <code class="inline"><a class="l_k" href="functions/open.html">open</a></code> except that its first parameter
is not a filename but rather a file handle name, a FileHandle object,
or a file descriptor number.</p>
<p>If the C functions fgetpos() and fsetpos() are available, then
<code class="inline"><span class="w">FileHandle::getpos</span></code>
 returns an opaque value that represents the
current position of the FileHandle, and <code class="inline"><span class="w">FileHandle::setpos</span></code>
 uses
that value to return to a previously visited position.</p>
<p>If the C function setvbuf() is available, then <code class="inline"><span class="w">FileHandle::setvbuf</span></code>

sets the buffering policy for the FileHandle.  The calling sequence
for the Perl function is the same as its C counterpart, including the
macros <code class="inline"><span class="w">_IOFBF</span></code>
, <code class="inline"><span class="w">_IOLBF</span></code>
, and <code class="inline"><span class="w">_IONBF</span></code>
, except that the buffer
parameter specifies a scalar variable to use as a buffer.  WARNING: A
variable used as a buffer by <code class="inline"><span class="w">FileHandle::setvbuf</span></code>
 must not be
modified in any way until the FileHandle is closed or until
<code class="inline"><span class="w">FileHandle::setvbuf</span></code>
 is called again, or memory corruption may
result!</p>
<p>See <a href="perlfunc.html">perlfunc</a> for complete descriptions of each of the following
supported <code class="inline"><span class="w">FileHandle</span></code>
 methods, which are just front ends for the
corresponding built-in functions:</p>
<pre class="verbatim"><ol><li>    <a class="l_k" href="functions/close.html">close</a></li><li>    <a class="l_k" href="functions/fileno.html">fileno</a></li><li>    <a class="l_k" href="functions/getc.html">getc</a></li><li>    <span class="w">gets</span></li><li>    <a class="l_k" href="functions/eof.html">eof</a></li><li>    <span class="w">clearerr</span></li><li>    <a class="l_k" href="functions/seek.html">seek</a></li><li>    <a class="l_k" href="functions/tell.html">tell</a></li></ol></pre><p>See <a href="perlvar.html">perlvar</a> for complete descriptions of each of the following
supported <code class="inline"><span class="w">FileHandle</span></code>
 methods:</p>
<pre class="verbatim"><ol><li>    <span class="w">autoflush</span></li><li>    <span class="w">output_field_separator</span></li><li>    <span class="w">output_record_separator</span></li><li>    <span class="w">input_record_separator</span></li><li>    <span class="w">input_line_number</span></li><li>    <span class="w">format_page_number</span></li><li>    <span class="w">format_lines_per_page</span></li><li>    <span class="w">format_lines_left</span></li><li>    <span class="w">format_name</span></li><li>    <span class="w">format_top_name</span></li><li>    <span class="w">format_line_break_characters</span></li><li>    <span class="w">format_formfeed</span></li></ol></pre><p>Furthermore, for doing normal I/O you might need these:</p>
<ul>
<li><a name="%24fh-%3eprint"></a><b>$fh-&gt;print</b>
<p>See <a href="functions/print.html">print</a>.</p>
</li>
<li><a name="%24fh-%3eprintf"></a><b>$fh-&gt;printf</b>
<p>See <a href="functions/printf.html">printf</a>.</p>
</li>
<li><a name="%24fh-%3egetline"></a><b>$fh-&gt;getline</b>
<p>This works like &lt;$fh&gt; described in <a href="perlop.html#I%2fO-Operators">I/O Operators in perlop</a>
except that it's more readable and can be safely called in a
list context but still returns just one line.</p>
</li>
<li><a name="%24fh-%3egetlines"></a><b>$fh-&gt;getlines</b>
<p>This works like &lt;$fh&gt; when called in a list context to
read all the remaining lines in a file, except that it's more readable.
It will also croak() if accidentally called in a scalar context.</p>
</li>
</ul>
<p>There are many other functions available since FileHandle is descended
from IO::File, IO::Seekable, and IO::Handle.  Please see those
respective pages for documentation on more functions.</p>
<a name="SEE-ALSO"></a><h1>SEE ALSO</h1>
<p>The <b>IO</b> extension,
<a href="perlfunc.html">perlfunc</a>, 
<a href="perlop.html#I%2fO-Operators">I/O Operators in perlop</a>.</p>




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