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       XBase::Base - Base input output module for XBase suite


       Used indirectly, via XBase or XBase::Memo.


       This module provides catch-all I/O methods for other XBase classes,
       should be used by people creating additional XBase classes/methods.
       There is nothing interesting in here for users of the XBase(3) module.
       Methods in XBase::Base return nothing (undef) on error and the error
       message can be retrieved using the errstr method.

       Methods are:

       new Constructor. Creates the object and if the file name is specified,
           opens the file.

           Opens the file and using method read_header reads the header and
           sets the object's data structure. The read_header should be defined
           in the derived class, there is no default.

           Closes the file, doesn't destroy the object.

           Unlinks the file.

           Creates file of given name. Second (optional) parameter is the
           permission specification for the file.

       The reading/writing methods assume that the file has got header of
       length header_len bytes (possibly 0) and then records of length
       record_len. These two values should be set by the read_header method.

       seek_to, seek_to_record
           Seeks to absolute position or to the start of the record.

       read_record, read_from
           Reads data from specified position (offset) or from the given
           record.  The second parameter (optional for read_record) is the
           length to read. It can be negative, and at that case the read will
           not complain if the file is shorter than requested.

       write_to, write_record
           Writes data to the absolute position or to specified record
           position.  The data is not padded to record_len, just written out.

       General locking methods are locksh, lockex and unlock, they call
       _locksh, _lockex and _unlock which can be redefined to allow any way
       for locking (not only the default flock). The user is responsible for
       calling the lock if he needs it.

       No more description -- check the source code if you need to know more.





       (c) 1997--2011 Jan Pazdziora.


       perl(1), XBase(3)

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