| 1 | //Copyright (c) 2006-2009 Emil Dotchevski and Reverge Studios, Inc. |
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| 2 | |
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| 3 | //Distributed under the Boost Software License, Version 1.0. (See accompanying |
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| 4 | //file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 5 | |
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| 6 | //This example demonstrates the intended use of various commonly used |
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| 7 | //error_info typedefs provided by Boost Exception. |
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| 8 | |
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| 9 | #include <boost/exception/errinfo_api_function.hpp> |
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| 10 | #include <boost/exception/errinfo_at_line.hpp> |
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| 11 | #include <boost/exception/errinfo_errno.hpp> |
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| 12 | #include <boost/exception/errinfo_file_handle.hpp> |
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| 13 | #include <boost/exception/errinfo_file_name.hpp> |
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| 14 | #include <boost/exception/errinfo_file_open_mode.hpp> |
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| 15 | #include <boost/exception/info.hpp> |
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| 16 | #include <boost/throw_exception.hpp> |
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| 17 | #include <boost/shared_ptr.hpp> |
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| 18 | #include <boost/weak_ptr.hpp> |
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| 19 | #include <stdio.h> |
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| 20 | #include <errno.h> |
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| 21 | #include <exception> |
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| 22 | |
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| 23 | struct error : virtual std::exception, virtual boost::exception { }; |
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| 24 | struct file_error : virtual error { }; |
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| 25 | struct file_open_error: virtual file_error { }; |
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| 26 | struct file_read_error: virtual file_error { }; |
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| 27 | |
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| 28 | boost::shared_ptr<FILE> |
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| 29 | open_file( char const * file, char const * mode ) |
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| 30 | { |
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| 31 | if( FILE * f=fopen(filename: file,modes: mode) ) |
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| 32 | return boost::shared_ptr<FILE>(f,fclose); |
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| 33 | else |
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| 34 | BOOST_THROW_EXCEPTION( |
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| 35 | file_open_error() << |
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| 36 | boost::errinfo_api_function("fopen" ) << |
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| 37 | boost::errinfo_errno(errno) << |
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| 38 | boost::errinfo_file_name(file) << |
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| 39 | boost::errinfo_file_open_mode(mode) ); |
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| 40 | } |
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| 41 | |
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| 42 | size_t |
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| 43 | read_file( boost::shared_ptr<FILE> const & f, void * buf, size_t size ) |
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| 44 | { |
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| 45 | size_t nr=fread(ptr: buf,size: 1,n: size,stream: f.get()); |
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| 46 | if( ferror(stream: f.get()) ) |
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| 47 | BOOST_THROW_EXCEPTION( |
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| 48 | file_read_error() << |
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| 49 | boost::errinfo_api_function("fread" ) << |
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| 50 | boost::errinfo_errno(errno) << |
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| 51 | boost::errinfo_file_handle(f) ); |
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| 52 | return nr; |
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| 53 | } |
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| 54 | |
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