Re: [Vala] Segmentation fault when sending an integer over DBus to a service written in Python

[Frederik <scumm_fredo gmx net>]

markus korn wrote:
> Hi,
> let's say I've a DBus service written in python, and I would like to
> write a client using vala to invoke a remote method with an integer
> argument (see sample code below). For me the client segfaults whenever
> I try to run it.

It works with Vala 0.7.9.

> So here are my questions:
>  * is such scenario even possible (using a client written in vala to
> access a service written in python)? does anybody have sample code for
> this?

Yes, it's possible. Your code is a good example. :)

>  * did I do something wrong on the vala side which might explain the
> issue (I just discovered vala today, so there is a good chance for
> it)?
>
> $ valac --version  # (ubuntu karmic)
> Vala 0.7.6

You should try the Ubuntu Vala PPA:
https://launchpad.net/~vala-team/+archive/ppa
(Don't forget to uninstall the old 'valac' package of the main repository)

> $ python pyserver.py   # to run the service
> $ valac --pkg dbus-glib-1 client.vala    # to compile the client
> $ ./client   # to run the client
>
>
> =========
> pyserver.py
> =========
>
> import gobject
>
> import dbus
> import dbus.service
> import dbus.mainloop.glib
>
>
> class SomeObject(dbus.service.Object):
>
>     @dbus.service.method("org.example.Test", in_signature="i",
> out_signature="i")
>     def test_int(self, i):

Try

      def TestInt(self, i):

at this point (because Vala does D-Bus method name transformation:
"test_int" -> "TestInt") and compile the client with Vala 0.7.9. Then it
should work.


Best regards,

Frederik