exceptions.hpp

用STL的方式封装了WindowsAPI、COM调用、ACE、ATL、MFC、WTL等多种组件

/* /////////////////////////////////////////////////////////////////////////
 * File:        inetstl/exceptions.hpp (formerly inetstl_exceptions.h)
 *
 * Purpose:     Contains the internet_exception class.
 *
 * Created:     25th April 2004
 * Updated:     10th June 2006
 *
 * Home:        http://stlsoft.org/
 *
 * Copyright (c) 2004-2006, Matthew Wilson and Synesis Software
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - Neither the name(s) of Matthew Wilson and Synesis Software nor the names of
 *   any contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * ////////////////////////////////////////////////////////////////////// */


/// \file inetstl/exceptions.hpp
///
/// Contains the internet_exception class.

#ifndef INETSTL_INCL_INETSTL_HPP_EXCEPTIONS
#define INETSTL_INCL_INETSTL_HPP_EXCEPTIONS

#ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION
# define INETSTL_VER_INETSTL_HPP_EXCEPTIONS_MAJOR       3
# define INETSTL_VER_INETSTL_HPP_EXCEPTIONS_MINOR       3
# define INETSTL_VER_INETSTL_HPP_EXCEPTIONS_REVISION    3
# define INETSTL_VER_INETSTL_HPP_EXCEPTIONS_EDIT        28
#endif /* !STLSOFT_DOCUMENTATION_SKIP_SECTION */

/* /////////////////////////////////////////////////////////////////////////
 * Includes
 */

#ifndef INETSTL_INCL_INETSTL_H_INETSTL
# include <inetstl/inetstl.h>
#endif /* !INETSTL_INCL_INETSTL_H_INETSTL */
#ifndef STLSOFT_INCL_STLSOFT_HPP_EXCEPTIONS
# include <stlsoft/exceptions.hpp>
#endif /* !STLSOFT_INCL_STLSOFT_HPP_EXCEPTIONS */
#ifndef STLSOFT_INCL_STLSOFT_UTIL_HPP_EXCEPTION_STRING
# include <stlsoft/util/exception_string.hpp>
#endif /* !STLSOFT_INCL_STLSOFT_UTIL_HPP_EXCEPTION_STRING */

#ifndef STLSOFT_CF_EXCEPTION_SUPPORT
# error This file cannot be included when exception-handling is not supported
#endif /* !STLSOFT_CF_EXCEPTION_SUPPORT */

/* /////////////////////////////////////////////////////////////////////////
 * Namespace
 */

#ifndef _INETSTL_NO_NAMESPACE
# if defined(_STLSOFT_NO_NAMESPACE) || \
     defined(STLSOFT_DOCUMENTATION_SKIP_SECTION)
/* There is no stlsoft namespace, so must define ::inetstl */
namespace inetstl
{
# else
/* Define stlsoft::inetstl_project */

namespace stlsoft
{

namespace inetstl_project
{

# endif /* _STLSOFT_NO_NAMESPACE */
#endif /* !_INETSTL_NO_NAMESPACE */

/* /////////////////////////////////////////////////////////////////////////
 * Classes
 */

/// \brief Exception class for general Windows operating system failures
class internet_exception
    : public os_exception
{
/// \name Types
/// @{
protected:
    typedef stlsoft_ns_qual(exception_string)   string_type;
public:
    typedef os_exception                        parent_class_type;
    typedef is_dword_t                          error_code_type;
    typedef internet_exception                  class_type;
/// @}

/// \name Construction
/// @{
public:
    ss_explicit_k internet_exception(error_code_type err)
        : m_reason()
        , m_errorCode(err)
    {}
    internet_exception(class_type const &rhs)
        : m_reason(rhs.m_reason)
        , m_errorCode(rhs.m_errorCode)
    {}
    internet_exception(char const *reason, error_code_type err)
        : m_reason(class_type::create_reason_(reason, err))
        , m_errorCode(err)
    {}
protected:
    internet_exception(string_type const &reason, error_code_type err)
        : m_reason(reason)
        , m_errorCode(err)
    {}
public:
    /// Destructor
    ///
    /// \note This does not do have any implementation, but is required to placate
    /// the Comeau and GCC compilers, which otherwise complain about mismatched
    /// exception specifications between this class and its parent
    virtual ~internet_exception() stlsoft_throw_0()
    {}
/// @}

/// \name Accessors
/// @{
public:
    virtual char const *what() const stlsoft_throw_0()
    {
        if(!m_reason.empty())
        {
            return m_reason.c_str();
        }
        else
        {
            return "Internet failure";
        }
    }

    error_code_type get_error_code() const stlsoft_throw_0()
    {
        return m_errorCode;
    }
    error_code_type last_error() const stlsoft_throw_0()
    {
        return m_errorCode;
    }
    error_code_type error() const stlsoft_throw_0()
    {
        return m_errorCode;
    }
/// @}

/// \name Implementation
/// @{
private:
    static string_type create_reason_(char const *reason, error_code_type err)
    {
        if( err == static_cast<error_code_type>(E_OUTOFMEMORY) ||
            err == static_cast<error_code_type>(ERROR_OUTOFMEMORY) ||
            NULL == reason ||
            '\0' == reason[0])
        {
            return string_type();
        }
        else
        {
            return string_type(reason);
        }
    }
/// @}

/// \name Members
/// @{
private:
    const string_type   m_reason;
    error_code_type     m_errorCode;
/// @}

/// \name Not to be implemented
/// @{
private:
    class_type &operator =(class_type const &);
/// @}
};

/* /////////////////////////////////////////////////////////////////////////
 * Policies
 */

/// The policy class, which throws a internet_exception class.
// [[synesis:class:exception-policy: throw_internet_exception_policy]]
struct throw_internet_exception_policy
{
/// \name Member Types
/// @{
public:
    /// The thrown type
    typedef internet_exception                  thrown_type;
    typedef internet_exception::error_code_type error_code_type;
/// @}

/// \name Operators
/// @{
public:
    /// Function call operator, taking no parameters
    void operator ()() const
    {
        throw_exception_(thrown_type(::GetLastError()));
    }
    /// Function call operator, taking one parameter
    void operator ()(error_code_type err) const
    {
        throw_exception_(thrown_type(err));
    }
    /// Function call operator, taking two parameters
    void operator ()(char const *reason, error_code_type err) const
    {
        throw_exception_(thrown_type(reason, err));
    }
/// @}

/// \name Implementation
/// @{
private:
#if defined(STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT)
    template <ss_typename_param_k X>
    static void throw_exception_(X const &x)
#elif defined(STLSOFT_COMPILER_IS_MSVC) && \
      _MSC_VER < 1200
    static void throw_exception_(std::exception const &x)
#else /* ? feature / compiler */
    static void throw_exception_(thrown_type const &x)
#endif /* feature / compiler */
    {
        throw x;
    }
/// @}
};

/* ////////////////////////////////////////////////////////////////////// */

#ifndef _INETSTL_NO_NAMESPACE
# if defined(_STLSOFT_NO_NAMESPACE) || \
     defined(STLSOFT_DOCUMENTATION_SKIP_SECTION)
} // namespace inetstl
# else
} // namespace inetstl_project
} // namespace stlsoft
# endif /* _STLSOFT_NO_NAMESPACE */
#endif /* !_INETSTL_NO_NAMESPACE */

/* ////////////////////////////////////////////////////////////////////// */

#endif /* INETSTL_INCL_INETSTL_HPP_EXCEPTIONS */

/* ////////////////////////////////////////////////////////////////////// */