From pykde  Thu May 27 13:33:53 2004
From: Stefan Bund <l-pykde.z.xalan () xoxy ! net>
Date: Thu, 27 May 2004 13:33:53 +0000
To: pykde
Subject: [PyKDE] Re: dcop
Message-Id: <87oeoagfjy.fsf_-_ () xoxy ! net>
X-MARC-Message: https://marc.info/?l=pykde&m=108566498225198

Jim Bublitz <jbublitz@nwinternet.com> writes:
> I haven't looked at the DCOPObject stuff very much, but it shouldn't be too 
> much of a problem (famous last words). Marshalling/demarshalling is the hard 
> part - very ugly in Python, very easy in C++.
>
> You can use Python strings as QByteArrays, but much beyond a single int or a 
> real char string that's pretty difficult.

Inspired by this thread, I revisited an old pyqt application and
implemented a simple PyDCOP module to support DCOP clients and servers
from python in a nice and straight forward way. Till now, I have
implemented marshaling of int's and QStrings, but other types should
not be to hard. I think, I'll at least implement QStringList, as thats
used quite often. 

I have however a Problem in my PyDCOP.DCOPClient implementation. I get
a "SystemError: ../Objects/classobject.c:518: bad argument to internal
function" when calling DCOPClient::call from python:

        (rv, replyType, replyData) = \
             self._client.call(self._appid, self._object, id, data)

(self._client is a dcop.DCOPClient instance ...) The call is
successfully transfered (that is, the remote app receives and
correctly handles the request), but probably while processing the
return value, I get this error. This is using sip 3.10.2, pyqt 3.11
and PyKDE 3.11rc1 (sip and pyqt installed from debian unstable
packages).

I don't have any clue, what this is about and would appreciate any
pointer.

Stefan.

PS: It would be much nicer to just have access to the Qt QDataStream
stream operators under python instead of re-implementing the streaming
in pure python. It would suffice, to just map all the '<<' and
'>>' operators to some 'read_<type>' and 'write_<type>'
functions, I even tried that as a quick hack in an old pykde
version. Worked flawlessly: s = QDataStream(a); i =
s.read_int(); q = s.read_QString() ...

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