log.h

vc ADO 连接数据库

// Log.h : header file for Exception Handling Functionality
//
#ifndef _LOG_H
    #define _LOG_H

    /////////////////////////////////////////////////////////////////////////////
    // Ensure we have necessary includes for supported Exceptions.
    /////////////////////////////////////////////////////////////////////////////
    
    #ifndef __AFXWIN_H__        // CException          CArchiveException  CFileException    
        #include <afxwin.h>     // CSimpleException    CMemoryException   CNotSupportedException
    #endif                      // CResourceException  CUserException
                                // Other MFC Exceptions are included in LOG.CPP so as to
                                // have minimal impact on your existing application

    #if _MSC_VER >= 1100        // VC 5.0 specific -- support for 
        #include <comdef.h>     // #import and _com_error exception class
    #endif

    /////////////////////////////////////////////////////////////////////////////
    // Misc. Functions/Class Declarations
    /////////////////////////////////////////////////////////////////////////////

    // Crack HRESULT into error message
    extern CString LogCrackHR( HRESULT hr );

    // Initialize Exception Handling
    extern void LogEnable( BOOL bLogVerbose );

    // Dump contents of all exceptions logged.
    extern void LogDisplay( void );
    extern void LogDisplay( CListBox &mListBox, BOOL bReset = FALSE );

    // Reset list of Exceptions
    extern void LogReset( void );

    extern BOOL LogSaveToFile( LPCTSTR lpszFileName );

    // Class for Win32 Structured Exception Handling
    class SEH_Exception {
    private:
        unsigned int m_uSECode;
    public:
        SEH_Exception(unsigned int uSECode) : m_uSECode(uSECode) {}
        SEH_Exception() {}
        ~SEH_Exception() {}
        unsigned int getSeHNumber() { return m_uSECode; }
    };

    /////////////////////////////////////////////////////////////////////////////
    // Exception Logging Functions -- The File/Date/Time version(s)
    /////////////////////////////////////////////////////////////////////////////

    // Used to store each line of text from LogException() functions
    extern void Log( LPCTSTR lpszFormat, ... );   // Message Format String

    // Crack open and log details of different types of exceptions
    extern void LogException( CException    *e,               // MFC Exception
                              LPCSTR        lpszTimeStamp,    // Date & Time    
                              LPCSTR        lpszFile,         // File Name
                              int           nLine        );   // Line #
           
    extern void LogException( SEH_Exception &e,               // Win32 SEH Class
                              LPCSTR        lpszTimeStamp,    // Date & Time    
                              LPCSTR        lpszFile,         // File Name
                              int           nLine        );   // Line #
           
    #if _MSC_VER >= 1100
    extern void LogException( _com_error    &e,               // #import excep class
                              LPCSTR        lpszTimeStamp,    // Date & Time    
                              LPCSTR        lpszFile,         // File Name
                              int           nLine        );   // Line #
    #endif

    extern void LogException( LPCSTR        lpszTimeStamp,    // Date & Time    
                              LPCSTR        lpszFile,         // File Name
                              int           nLine        );   // Line #

    /////////////////////////////////////////////////////////////////////////////
    // Exception Logging Functions -- Just log the exception, ma'am
    /////////////////////////////////////////////////////////////////////////////

    // Crack open and log details of different types of exceptions
    extern void LogException( CException    *e );             // MFC Exception
    extern void LogException( SEH_Exception &e );             // Win32 SEH Class
    extern void LogException( );                              // Unhandled excep
           
    #if _MSC_VER >= 1100
    extern void LogException( _com_error    &e );             // #import excep class
    #endif


    /////////////////////////////////////////////////////////////////////////////
    // Exception Trapping Macros (3 flavors for 2 versions of the product)
    //
    // There are 3 flavors of exception trapping macro given below.  One version
    // of these is specific to VC 4.X, i.e. no support for _com_error, the
    // second for VC 5.0 or greater, i.e. support for _com_error.
    //
    // LOGQ -- Quiet trapping of rexceptions.  No logging of messages, but
    //         sets a Boolean value (bRetVal) to FALSE to indicate exception 
    //         occured.  This means your function needs:
     //              BOOL    bRetVal = TRUE;
    //         to use this macro.    
    // LOGE -- Catches exception, deciphers it and logs it.
    // LOGR -- Catches exception, deciphers it, logs it, and sets a Boolean
    //         value (bRetVal) to FALSE to indicate exception occured.  This
    //         means your function needs:
     //              BOOL    bRetVal = TRUE;
    //         to use this macro.
    /////////////////////////////////////////////////////////////////////////////

    // VC 4.X version(s)
    #if _MSC_VER < 1100

        // The quiet version, no logging, just catch the exception
        #define LOGQ( f ) try                           \
                          {                             \
                              f;                        \
                          }                             \
                          catch( CException *e)         \
                          {                             \
                              e->Delete();              \
                          }                             \
                          catch( SEH_Exception )        \
                          {                             \
                          }                             \
                          catch(...)                    \
                          {                             \
                          }


        // The logging version, but still quietly catches the exception
        #define LOGE( f ) try                               \
                          {                                 \
                              f;                            \
                          }                                 \
                          catch( CException *e )            \
                          {                                 \
                              LogException( e,              \
                                            __TIMESTAMP__,  \
                                            __FILE__,       \
                                            __LINE__      );\
                          }                                 \
                          catch( SEH_Exception &e )         \
                          {                                 \
                              LogException( e,              \