C++ ostream::exceptions方法代码示例

void ModelOutput::Write(const CModel& model, std::ostream &stream, ModelFormat format)
{
    stream.exceptions(std::ios_base::failbit | std::ios_base::badbit);

    try
    {
        switch (format)
        {
            case ModelFormat::Text:
                WriteTextModel(model, stream);
                break;

            case ModelFormat::Binary:
                WriteBinaryModel(model, stream);
                break;

            case ModelFormat::Old:
                WriteOldModel(model, stream);
                break;
        }
    }
    catch (const CModelIOException& e)
    {
        throw;
    }
    catch (const std::exception& e)
    {
        throw CModelIOException(std::string("Error saving model data: ") + e.what());
    }
}

// Save & change and restore stream properties
void
saver_tests_2
(
    std::istream &  input,
    std::ostream &  output,
    std::ostream &  err
)
{
    using std::locale;
    using std::ios_base;

    boost::io::ios_tie_saver const    its( input, &err );
    boost::io::ios_rdbuf_saver const  irs( output, err.rdbuf() );
    boost::io::ios_iword_saver const  iis( output, my_index, 69L );
    boost::io::ios_pword_saver const  ipws( output, my_index, &err );
    output << "The data is (a third time; adding the numbers):\n";

    boost::io::ios_flags_saver const      ifls( output, (output.flags()
     & ~ios_base::adjustfield) | ios_base::showpos | ios_base::boolalpha
     | (ios_base::internal & ios_base::adjustfield) );
    boost::io::ios_precision_saver const  iprs( output, 9 );
    boost::io::ios_fill_saver const       ifis( output, '@' );
    output << '\t' << test_string << '\n';

    boost::io::ios_width_saver const  iws( output, 12 );
    output.put( '\t' );
    output << test_num1 + test_num2;
    output.put( '\n' );

    locale                             loc( locale::classic(),
     new backward_bool_names );
    boost::io::ios_locale_saver const  ils( output, loc );
    output << '\t' << test_bool << '\n';

    BOOST_CHECK( &err == output.pword(my_index) );
    BOOST_CHECK( 69L == output.iword(my_index) );

    try
    {
        boost::io::ios_exception_saver const  ies( output, ios_base::eofbit  );
        boost::io::ios_iostate_saver const    iis( output, output.rdstate()
         | ios_base::eofbit );

        BOOST_ERROR( "previous line should have thrown" );
    }
    catch ( ios_base::failure &f )
    {
        err << "Got the expected I/O failure: \"" << f.what() << "\".\n";
        BOOST_CHECK( output.exceptions() == ios_base::goodbit );
    }
    catch ( ... )
    {
        err << "Got an unknown error when doing exception test!\n";
        throw;
    }
}

inline std::ostream& alert_stream()
{
    // Double parentheses: don't parse comma as a macro parameter separator.
    BOOST_STATIC_ASSERT((boost::is_base_and_derived<alert_buf,T>::value));
    static T buffer_;
    static std::ostream stream_(&buffer_);
    stream_.clear();
    stream_.exceptions(std::ios_base::failbit | std::ios_base::badbit);
    return stream_;
}

/*
 * Writes the given SBML document to the output stream.
 *
 * @return true on success and false if one of the underlying parser
 * components fail (rare).
 */
bool
SBMLWriter::writeSBML (const SBMLDocument* d, std::ostream& stream)
{
  bool result = false;

  try
  {
    stream.exceptions(ios_base::badbit | ios_base::failbit | ios_base::eofbit);
    XMLOutputStream xos(stream, "UTF-8", true, mProgramName, 
                                               mProgramVersion);
    d->write(xos);
    stream << endl;

    result = true;
  }
  catch (ios_base::failure&)
  {
    SBMLErrorLog *log = (const_cast<SBMLDocument *>(d))->getErrorLog();
    log->logError(XMLFileOperationError);
  }

  return result;
}

bool renderPresentation(
                   const std::map<std::string,std::string>& vars,
                   const std::vector<boost::iostreams::regex_filter>& filters,
                   std::ostream& os,
                   std::string* pErrMsg)
{
   std::string presentationTemplate =
                           resourceFiles().get("presentation/slides.html");
   std::istringstream templateStream(presentationTemplate);

   try
   {
      os.exceptions(std::istream::failbit | std::istream::badbit);
      boost::iostreams::filtering_ostream filteredStream ;

      // template filter
      text::TemplateFilter templateFilter(vars);
      filteredStream.push(templateFilter);

      // custom filters
      for (std::size_t i=0; i<filters.size(); i++)
         filteredStream.push(filters[i]);

      // target stream
      filteredStream.push(os);

      boost::iostreams::copy(templateStream, filteredStream, 128);
   }
   catch(const std::exception& e)
   {
      *pErrMsg = e.what();
      return false;
   }

   return true;
}

// Save, change, and restore stream properties
void
saver_tests_1
(
    std::istream &  input,
    std::ostream &  output,
    std::ostream &  err
)
{
    using std::locale;
    using std::ios_base;
    using std::setw;

    boost::io::ios_flags_saver const      ifls( output );
    boost::io::ios_precision_saver const  iprs( output );
    boost::io::ios_width_saver const      iws( output );
    boost::io::ios_tie_saver const        its( input );
    boost::io::ios_rdbuf_saver const      irs( output );
    boost::io::ios_fill_saver const       ifis( output );
    boost::io::ios_locale_saver const     ils( output );
    boost::io::ios_iword_saver const      iis( output, my_index );
    boost::io::ios_pword_saver const      ipws( output, my_index );

    locale  loc( locale::classic(), new backward_bool_names );

    input.tie( &err );
    output.rdbuf( err.rdbuf() );
    output.iword( my_index ) = 69L;
    output.pword( my_index ) = &err;

    output << "The data is (again):\n";
    output.setf( ios_base::showpos | ios_base::boolalpha );
    output.setf( ios_base::internal, ios_base::adjustfield );
    output.fill( '@' );
    output.precision( 9 );
    output << '\t' << test_string << '\n';
    output << '\t' << setw( 10 ) << test_num1 << '\n';
    output << '\t' << setw( 15 ) << test_num2 << '\n';
    output.imbue( loc );
    output << '\t' << test_bool << '\n';

    BOOST_CHECK( &err == output.pword(my_index) );
    BOOST_CHECK( 69L == output.iword(my_index) );

    try
    {
        boost::io::ios_exception_saver const  ies( output );
        boost::io::ios_iostate_saver const    iis( output );

        output.exceptions( ios_base::eofbit );
        output.setstate( ios_base::eofbit );
        BOOST_ERROR( "previous line should have thrown" );
    }
    catch ( ios_base::failure &f )
    {
        err << "Got the expected I/O failure: \"" << f.what() << "\".\n";
        BOOST_CHECK( output.exceptions() == ios_base::goodbit );
    }
    catch ( ... )
    {
        err << "Got an unknown error when doing exception test!\n";
        throw;
    }
}

//Rebuild PE image and write it to "out" ostream
//If strip_dos_header is true, DOS headers partially will be used for PE headers
//If change_size_of_headers == true, SizeOfHeaders will be recalculated automatically
//If save_bound_import == true, existing bound import directory will be saved correctly (because some compilers and bind.exe put it to PE headers)
void rebuild_pe(pe_base& pe, std::ostream& out, bool strip_dos_header, bool change_size_of_headers, bool save_bound_import)
{
    if(out.bad())
        throw pe_exception("Stream is bad", pe_exception::stream_is_bad);

    if(save_bound_import && pe.has_bound_import())
    {
        if(pe.section_data_length_from_rva(pe.get_directory_rva(image_directory_entry_bound_import), pe.get_directory_rva(image_directory_entry_bound_import), section_data_raw, true)
            < pe.get_directory_size(image_directory_entry_bound_import))
            throw pe_exception("Incorrect bound import directory", pe_exception::incorrect_bound_import_directory);
    }

    //Change ostream state
    out.exceptions(std::ios::goodbit);
    out.clear();
    
    uint32_t original_bound_import_rva = pe.has_bound_import() ? pe.get_directory_rva(image_directory_entry_bound_import) : 0;
    if(original_bound_import_rva && original_bound_import_rva > pe.get_size_of_headers())
    {
        //No need to do anything with bound import directory
        //if it is placed inside of any section, not headers
        original_bound_import_rva = 0;
        save_bound_import = false;
    }

    {
        image_dos_header dos_header;

        //Rebuild PE image headers
        rebuild_pe(pe, dos_header, strip_dos_header, change_size_of_headers, save_bound_import);

        //Write DOS header
        out.write(reinterpret_cast<const char*>(&dos_header), strip_dos_header ? 8 * sizeof(uint16_t) : sizeof(image_dos_header));
    }

    //If we have stub overlay, write it too
    {
        const std::string& stub = pe.get_stub_overlay();
        if(stub.size())
        {
            out.write(stub.data(), stub.size());
            size_t aligned_size = pe_utils::align_up(stub.size(), sizeof(uint32_t));
            //Align PE header, which is right after rich overlay
            while(aligned_size > stub.size())
            {
                out.put('\0');
                --aligned_size;
            }
        }
    }
    
    //Write NT headers
    out.write(static_cast<const pe_base&>(pe).get_nt_headers_ptr(), pe.get_sizeof_nt_header()
        - sizeof(image_data_directory) * (image_numberof_directory_entries - pe.get_number_of_rvas_and_sizes()));

    //Write section headers
    const section_list& sections = pe.get_image_sections();
    for(section_list::const_iterator it = sections.begin(); it != sections.end(); ++it)
    {
        out.write(reinterpret_cast<const char*>(&(*it).get_raw_header()), sizeof(image_section_header));
    }

    //Write bound import data if requested
    if(save_bound_import && pe.has_bound_import())
    {
        out.write(pe.section_data_from_rva(original_bound_import_rva, section_data_raw, true),
            pe.get_directory_size(image_directory_entry_bound_import));
    }

    //Write section data finally
    for(section_list::const_iterator it = sections.begin(); it != sections.end(); ++it)
    {
        const section& s = *it;

        std::streamoff wpos = out.tellp();

        //Fill unused overlay data between sections with null bytes
        for(unsigned int i = 0; i < s.get_pointer_to_raw_data() - wpos; i++)
            out.put(0);

        //Write raw section data
        out.write(s.get_raw_data().data(), s.get_size_of_raw_data());
    }
}