从INI文件中读取数值的疑问

long ReadIntegerValueFromIni( const CString& csAppName_i,

                              const CString& csKeyName_i,

                              const CString& csDefaultVal_i,

                              const CString& csFileName_i,

                              const int nMinVal_i,

                              const int nMaxVal_i )

{

    long lKeyValue = 0;

    int nDefaultVal = _ttoi( csDefaultVal_i );

    try

    {

        const int SUCCESS_RET = 1;

        TCHAR tcszBuf[ MAX_PATH ];

        TCHAR tcszBufTemp[ MAX_PATH ];

        lKeyValue = nDefaultVal;

 

        // Read the value from INI file.

        GetPrivateProfileString( csAppName_i, csKeyName_i, csDefaultVal_i, tcszBuf, sizeof( tcszBuf ),

                                 csFileName_i );

        // Check whether the value read from ini is a valid numeric number or not.

        if( SUCCESS_RET != swscanf( tcszBuf, _T( "%d%s" ), &lKeyValue, &tcszBufTemp ))

        {

            lKeyValue = nDefaultVal;

            // Invalid value found so adjusted to Default Value.

        }

        // Check whether the value read from ini is within the allowed range or not.

        else if( nMinVal_i > lKeyValue || nMaxVal_i < lKeyValue )

        {

            lKeyValue = nDefaultVal;

            // Input value is not within the allowed range, so adjusted to Default Value

        }

        else

        {

            // Do nothing.

        }

    }

    catch( ... )

    {

        // Unhandled exception occured in ReadIntegerValueFromIni()

        lKeyValue = nDefaultVal;

    }

    return lKeyValue;

}