cerror.h

研读AxCrypt对加解密的处理方法

#pragma once
#ifndef AXPIPE_CERROR_H
#define AXPIPE_CERROR_H
/*! \file
    \brief Handle backward error propagation etc.

    @(#) $Id: CError.h,v 1.1.1.1 2003/12/17 21:36:56 svante Exp $

    AxPipe - Binary Stream Framework

    Copyright (C) 2003 Svante Seleborg/Axon Data, All rights reserved.

    This program is free software; you can redistribute it and/or modify it under the terms
    of the GNU General Public License as published by the Free Software Foundation;
    either version 2 of the License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
    without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
    See the GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along with this program;
    if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
    Boston, MA 02111-1307 USA

    The author may be reached at mailto:[e-mail] and http://axpipe.sourceforge.net

    Why is this framework released as GPL and not LGPL?
    See http://www.gnu.org/philosophy/why-not-lgpl.html

----
\verbatim
    CError.h                        Handle backward error propagation etc.

    E-mail                          YYYY-MM-DD              Reason
    [e-mail]              2003-12-05              Initial
\endverbatim
*/
#include "AxPipe.h"

#include "AxAssert.h"
#define AXLIB_ASSERT_FILE "CError.h"

namespace AxPipe {
/// \brief Base class to all segments, handles backwards error propagation etc.
///
/// The most commonly used members in derived classes are SetError() to
/// report an error and GetErrorCode() and GetErrorMsg() to check for errors
/// after plugging the pipe, and getting the error description if needed.
class CError {
private:
    CError *m_pPrev;                        ///< Point back to previous in pipe. NULL if Source.
    _TCHAR *m_szError;                      ///< Allocated message, only valid in Source. NULL otherwise.
    int m_iError;                           ///< Error code, only valid in Source. Success otherwise.

    /// Pass the string backwards to the source, where we store it.
    void InError(int iError, _TCHAR *szError);

protected:
   void Init(CError *pPrev);                ///< Used internally to initialize the pointer to previous. Don't call.

public:
    CError();                               ///< Just initialize the member variables.
    ~CError();                              ///< Delete the error message, if there is one.

    /// Signal an error from derived classes.
    void SetError(int iError, const _TCHAR *szError, const _TCHAR *szParam = NULL);
    
    _TCHAR *GetErrorMsg();                  ///< Retrieve an error message, if any.
    int GetErrorCode();                     ///< Retrieve the error code, if any.
};
}; // namespace AxPipe
#endif AXPIPE_CERROR_H