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<h1>Boost Exception</h1>
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<!-- Copyright (c) 2006-2009 Emil Dotchevski and Reverge Studios, Inc. -->
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<div class="RenoIncludeDIV"><div class="RenoAutoDIV"><h3>errinfo_file_handle</h3>
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<div class="RenoIncludeDIV"><p><span class="RenoEscape">&#35;<!--<wiki>`&#35;</wiki>--></span>include &lt;<span class="RenoLink"><a href="boost_exception_errinfo_file_handle_hpp.html">boost/exception/errinfo_file_handle.hpp</a></span>&gt;</p>
<div class="RenoIncludeDIV"><pre>#include &lt;<span class="RenoLink"><a href="boost_exception_error_info_hpp.html">boost/exception/error_info.hpp</a></span>&gt;

namespace
boost
    {
    template &lt;class&gt; class weak_ptr;
<span class="RenoIncludeSPAN">    <span class="RenoIncludeSPAN">typedef <span class="RenoLink"><a href="error_info.html">error_info</a></span>&lt;struct errinfo_file_handle_,weak_ptr&lt;FILE&gt; &gt; <span class="RenoLink">errinfo_file_handle</span>;</span></span>
    }</pre>
</div></div><p>This type is designed to be used as a standard <span class="RenoLink"><a href="error_info.html">error_info</a></span> instance for transporting a relevant FILE pointer managed by a boost::shared_ptr&lt;FILE&gt; in exceptions deriving from boost::<span class="RenoLink"><a href="exception.html">exception</a></span>.</p>
<h3>Example:</h3>
<div class="RenoIncludeDIV"><pre>#include &lt;<span class="RenoLink"><a href="boost_exception_errinfo_api_function_hpp.html">boost/exception/errinfo_api_function.hpp</a></span>&gt;
#include &lt;<span class="RenoLink"><a href="boost_exception_errinfo_at_line_hpp.html">boost/exception/errinfo_at_line.hpp</a></span>&gt;
#include &lt;<span class="RenoLink"><a href="boost_exception_errinfo_errno_hpp.html">boost/exception/errinfo_errno.hpp</a></span>&gt;
#include &lt;<span class="RenoLink"><a href="boost_exception_errinfo_file_handle_hpp.html">boost/exception/errinfo_file_handle.hpp</a></span>&gt;
#include &lt;<span class="RenoLink"><a href="boost_exception_errinfo_file_name_hpp.html">boost/exception/errinfo_file_name.hpp</a></span>&gt;
#include &lt;<span class="RenoLink"><a href="boost_exception_errinfo_file_open_mode_hpp.html">boost/exception/errinfo_file_open_mode.hpp</a></span>&gt;
#include &lt;<span class="RenoLink"><a href="boost_exception_info_hpp.html">boost/exception/info.hpp</a></span>&gt;
#include &lt;<span class="RenoLink"><a href="boost_throw_exception_hpp.html">boost/throw_exception.hpp</a></span>&gt;
#include &lt;boost/shared_ptr.hpp&gt;
#include &lt;boost/weak_ptr.hpp&gt;
#include &lt;stdio.h&gt;
#include &lt;errno.h&gt;
#include &lt;exception&gt;

struct error : virtual std::exception, virtual boost::<span class="RenoLink"><a href="exception.html">exception</a></span> { };
struct file_error : virtual error { };
struct file_open_error: virtual file_error { };
struct file_read_error: virtual file_error { };

boost::shared_ptr&lt;FILE&gt;
open_file( char const * file, char const * mode )
    {
    if( FILE * f=fopen(file,mode) )
        return boost::shared_ptr&lt;FILE&gt;(f,fclose);
    else
        <span class="RenoLink"><a href="BOOST_THROW_EXCEPTION.html">BOOST_THROW_EXCEPTION</a></span>(
            file_open_error() &lt;&lt;
            boost::<span class="RenoLink"><a href="errinfo_api_function.html">errinfo_api_function</a></span>("fopen") &lt;&lt;
            boost::<span class="RenoLink"><a href="errinfo_errno.html">errinfo_errno</a></span>(errno) &lt;&lt;
            boost::<span class="RenoLink"><a href="errinfo_file_name.html">errinfo_file_name</a></span>(file) &lt;&lt;
            boost::<span class="RenoLink"><a href="errinfo_file_open_mode.html">errinfo_file_open_mode</a></span>(mode) );
    }

size_t
read_file( boost::shared_ptr&lt;FILE&gt; const &amp; f, void * buf, size_t size )
    {
    size_t nr=fread(buf,1,size,f.get());
    if( ferror(f.get()) )
        <span class="RenoLink"><a href="BOOST_THROW_EXCEPTION.html">BOOST_THROW_EXCEPTION</a></span>(
            file_read_error() &lt;&lt;
            boost::<span class="RenoLink"><a href="errinfo_api_function.html">errinfo_api_function</a></span>("fread") &lt;&lt;
            boost::<span class="RenoLink"><a href="errinfo_errno.html">errinfo_errno</a></span>(errno) &lt;&lt;
            boost::<span class="RenoLink">errinfo_file_handle</span>(f) );
    return nr;
    }</pre>
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See also: <span class="RenoPageList"><a href="boost_exception_errinfo_file_handle_hpp.html">boost/exception/errinfo_file_handle.hpp</a></span>
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