log.cpp

vc ADO 连接数据库

// LOG : implementation file for Exception Handling Functionality

#include "stdafx.h"
#include <eh.h>
#include "Log.h"

#ifndef __AFXDISP_H__       // COleException  COleDispatchException    
    #include <afxdisp.h>
#endif

#ifndef __AFXTEMPL_H__      // Required for CArray
    #include <afxtempl.h>
#endif

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

static void LogExceptionEx( CException    *e );             // MFC Exception
static void LogExceptionEx( SEH_Exception &e );             // Win32 SEH Class
static void LogExceptionEx( _com_error    &e );             // #import Class
static void LogExceptionEx( );                              // Unhandled excep


// Prevent multiple "#ifndef _UNICODE" in this file...
#ifndef _UNICODE

    #define     VSPRINTF            vsprintf
    #define     STRCHR              strchr
    #define     STRLEN              strlen

    #define     MFC_EXCEPTION       _T("MFC Exception(%s) thrown:")

    #define     STR_FILE            _T("\t FILE: %s")
    #define     STR_TIME            _T("\t TIME: %s")
    #define     STR_MEANING         _T("\tCode meaning = %s")
    #define     STR_SOURCE          _T("\tSource = %s")
    #define     STR_DESCRIPTION     _T("\tDescription = %s")
    #define     STR_TMP             _T("%s")
    #define     STR_CAST            (char *)

#else

    #define     VSPRINTF            vswprintf
    #define     STRCHR              wcschr
    #define     STRLEN              wcslen

    #define     MFC_EXCEPTION       _T("MFC Exception(%S) thrown:")

    #define     STR_FILE            _T("\t FILE: %S")
    #define     STR_TIME            _T("\t TIME: %S")
    #define     STR_MEANING         _T("\tCode meaning = %S")
    #define     STR_SOURCE          _T("\tSource = %S")
    #define     STR_DESCRIPTION     _T("\tDescription = %S")
    #define     STR_TMP             _T("%S")
    #define     STR_CAST            (WCHAR *)


#endif // #ifndef _UNICODE



/////////////////////////////////////////////////////////////////////////////
// Local Data
/////////////////////////////////////////////////////////////////////////////

// Array of exceptions logged
static CArray<CString,CString>  Errors;

// Message box telling user exception was thrown???
static BOOL bVerbose = TRUE;

/////////////////////////////////////////////////////////////////////////////
// Misc. Functions
/////////////////////////////////////////////////////////////////////////////

// Return CString with error message returned by HR
CString LogCrackHR( HRESULT hr )
{
    LPVOID  lpMsgBuf;
    CString strTmp;

    ::FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
                     NULL,
                     hr,
                     MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
                     (LPTSTR) &lpMsgBuf,
                     0,
                     NULL ); 


    strTmp.Format( STR_TMP, (char *) lpMsgBuf );

    int i;
    while (  (i=strTmp.Find('\r')) > -1 )
    {
        strTmp.SetAt(i, ' ' );
    }

    while (  (i=strTmp.Find('\n')) > -1 )
    {
        strTmp.SetAt(i, ' ' );
    }

    // Free the buffer.
    ::LocalFree( lpMsgBuf );

    return strTmp;
}

static void MappingSEHtoCPPExceptions( unsigned int uExceptionCode, _EXCEPTION_POINTERS* )
{

    // The System Exception will be passed throw here and 
    // thrown by this function.  
    throw SEH_Exception( uExceptionCode );
}

// Initialize Exception Handling
void LogEnable( BOOL bLogVerbose )
{
    // Set Win32 Exceptions to be handled as C++ typed exceptions
    _set_se_translator(MappingSEHtoCPPExceptions);

    // Set Verbose flag
    bVerbose = bLogVerbose;
}


// Dump contents of all exceptions logged via TRACE
void LogDisplay( void )
{
    int nCount = Errors.GetSize();

    if ( nCount > 0 )
    {
        for( int i = 0; i < nCount; i++ )
        {
            TRACE( _T("%s"), Errors.GetAt( i ) );
        }
    }
    else
    {
        TRACE( _T("No Exceptions Logged(!)") );
    }
}

// Dump contents of all exceptions logged to a provided list box.
void LogDisplay( CListBox &mListBox, BOOL bReset )
{
    int nCount = Errors.GetSize();

    if ( bReset == TRUE )
        mListBox.ResetContent();

    if ( nCount > 0 )
    {
        for( int i = 0; i < nCount; i++ )
        {
            mListBox.AddString( Errors.GetAt( i ) );
        }
    }
    else
    {
        mListBox.AddString( _T("No Exceptions Logged(!)") );
    }
}

// Empty list of logged exceptions
void LogReset( void )
{
    Errors.RemoveAll();
}


/////////////////////////////////////////////////////////////////////////////
// Exception Logging Functions
/////////////////////////////////////////////////////////////////////////////

// Function to log a message, used just like printf
// This is used heavily by the LogException functions, but you can
// also use it to log your own messages as well.
void Log
( 
    LPCTSTR lpszFormat, // Message Format String
    ...                // Variable Argument List
)   
{
    // Attempt to process info, and if unable to successfully use
    // variable argument lists.
    try
    {
        // Build error string
        TCHAR    lpszLogError[1024];
        TCHAR    *pchChar;

        va_list marker;

        va_start ( marker, lpszFormat );

        VSPRINTF( lpszLogError, lpszFormat, marker );

        va_end   ( marker );

        // remove \r and \n
        while( (pchChar = STRCHR( lpszLogError, '\r' )) != NULL )
        {
            *pchChar = ' ';
        }

        while( (pchChar = STRCHR( lpszLogError, '\n' )) != NULL )
        {
            *pchChar = ' ';
        }

        Errors.Add( lpszLogError );
    }
    catch( CException *e )
    {
        Errors.Add( _T( "\t\t\t <<Unable to process error message info.>>" ) );
        e->Delete();
    }   
    catch( ... )
    {
        Errors.Add( _T( "\t\t\t <<Unable to process error message info.>>" ) );
    }   
}

// Functions to crack open exceptions called by LOG* Macros below.
// You probably wouldn't call these direct unless you were using
// your own try/catch block as opposed to the LOG* macros.
void LogException
(
    CException    *e,               // MFC Exception
    LPCSTR        lpszTimeStamp,    // Date & Time    
    LPCSTR        lpszFile,         // File Name
    int           nLine             // Line #
)
{
    // Just in case exception handling code throws an exception
    try
    {
        // Step 1:  Determine name of MFC Exception
        CString         strName;  
        CRuntimeClass   *pClass = e->GetRuntimeClass();

        ASSERT( pClass != NULL );
        ASSERT( pClass->m_lpszClassName != NULL );

        strName.Format( MFC_EXCEPTION, (LPCTSTR) pClass->m_lpszClassName );
        Log( strName );
        Log( STR_FILE,          (LPCTSTR) lpszFile );
        Log( _T("\t LINE #%d"), nLine );
        Log( STR_TIME,          (LPCTSTR) lpszTimeStamp );
    }
    catch( CException *e2 )
    {
        e2->Delete();
    }
    catch( ... )
    {
    }

    LogExceptionEx( e );
}

void LogException
(
    CException    *e                // MFC Exception
)
{
    CString strName;

    // Just in case exception handling code throws an exception
    try
    {
        // Step 1:  Determine name of MFC Exception
        CString         strName;  
        CRuntimeClass   *pClass = e->GetRuntimeClass();

        ASSERT( pClass != NULL );
        ASSERT( pClass->m_lpszClassName != NULL );

        strName.Format( MFC_EXCEPTION, (LPCTSTR) pClass->m_lpszClassName );
        Log( strName );
    }
    catch( CException *e2 )
    {
        e2->Delete();
    }
    catch( ... )
    {
    }

    LogExceptionEx( e );
}


static void LogExceptionEx
(
    CException    *e                // MFC Exception
)
{
    // Just in case exception handling code throws an exception
    try
    {
        // For certain Exception classes, GetErrorMessage is supported
        if ( ( e->IsKindOf( RUNTIME_CLASS( CArchiveException     ) ) == TRUE ) ||
             ( e->IsKindOf( RUNTIME_CLASS( CFileException        ) ) == TRUE ) ||
             ( e->IsKindOf( RUNTIME_CLASS( COleException         ) ) == TRUE ) ||
             ( e->IsKindOf( RUNTIME_CLASS( COleDispatchException ) ) == TRUE )    )
        {
            TCHAR   szBuf[256] = _T("");
            UINT    nHelpContextId;    
            BOOL    bRetVal = TRUE;

            e->GetErrorMessage( szBuf, 256, &nHelpContextId );

            if( STRLEN( szBuf ) > 0 )
            {
                Log( _T("\t Error Message = %s"), szBuf );
            }

        }

        // Individual Exception Information Handling
        if ( e->IsKindOf( RUNTIME_CLASS( CArchiveException )) == TRUE )
        {
            CArchiveException *eArchive = (CArchiveException *) e;

            switch( eArchive->m_cause )
            {
            case CArchiveException::none:
                Log( _T("\t Cause = None (No error occurred)." ) );
                break;
            case CArchiveException::generic:
                Log( _T("\t Cause = Generic (Unspecified error)." ) );
                break;
            case CArchiveException::readOnly:
                Log( _T("\t Cause = ReadOnly (Tried to write into an archive opened for loading)." ) );
                break;
            case CArchiveException::endOfFile:
                Log( _T("\t Cause = EndOfFile (Reached end of file while reading an object)." ) );
                break;
            case CArchiveException::writeOnly:
                Log( _T("\t Cause = WriteOnly (Tried to read from an archive opened for storing)." ) );
                break;
            case CArchiveException::badIndex:
                Log( _T("\t Cause = BadIndex (Invalid file format)." ) );
                break;
            case CArchiveException::badClass:
                Log( _T("\t Cause = BadClass (Tried to read an object into an object of the wrong type)." ) );
                break;