python binding: getting invoice entry data

[Christoph Holtermann]

Hello !

Am 19.01.2011 05:16, schrieb Brian St. Pierre:
> I'm trying to use the python bindings to fetch entry (line-item) data
> from an invoice.
>
> See http://pastebin.com/fy06CPup for the test GnuCash XML file I'm using.
>
> I expect the script below to print the three line items from the
> invoice in that file, but instead it dies with:
>
> % gnucash-env python invoice_read.py test2.gnucash
> * 15:07:39  WARN <gnc.backend.dbi> [gnc_module_init_backend_dbi()] No
> DBD drivers found
> Traceback (most recent call last):
>   File "invoice_read.py", line 16, in <module>
>     print entry.GetDescription()
>   File "/usr/lib/python2.6/dist-packages/gnucash/function_class.py",
> line 92, in method_function
>     *process_list_convert_to_instance(meth_func_args) )
>   File "/usr/lib/python2.6/dist-packages/gnucash/gnucash_core_c.py",
> line 3825, in gncEntryGetDescription
>     return _gnucash_core_c.gncEntryGetDescription(*args)
> TypeError: in method 'gncEntryGetDescription', argument 1 of type
> 'GncEntry const *'
>
> Other methods on the Entry objects yield similar results. (A similar
> approach to the code below with Invoice and Customer objects works
> ok.)
>
> Running on Ubuntu Lucid. Tested with 2.4.0-1~getdeb1~lucid from
> getdeb.net and from svn with the same results.
>
> Can someone point out what I'm doing wrong?
You just encountered an open end in the python-bindings. It's a problem of the
SWIG-headers. It is often encountered in uncharted territory ;-) As far as i know
the only way to get around that is to change the SWIG-headers. That has to
be done by someone wiser than me. There is no way to force python to accept
other types, is there ? (I have been looking for that for quite a while).

In the python level sometimes there are possibilities to work around. But i
can't find GncEntry anywhere and the only functions that seems to return a
pointer to an GncEntry gncEntryLookup which has to
be fed with a book and a guid. But i don't see how to get the guid of an entry.

regards,

Christoph Holtermann
> Thanks.
>
> --
> Brian St. Pierre
>
>
>
> #!/usr/bin/env python
> import os
> import sys
>
> from gnucash import Session
> from gnucash.gnucash_business import Entry
>
> uri = "xml://{0}".format(os.path.abspath(sys.argv[1]))
> ses = Session(uri, is_new=False)
> try:
>     book = ses.get_book()
>     invoice = book.InvoiceLookupByID('0001')
>     assert(len(invoice.GetEntries()) == 3)
>     for e in invoice.GetEntries():
>         entry = Entry(instance=e)
>         print entry.GetDescription()
> finally:
>     ses.end()
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