On Tue, Jul 14, 2009 at 10:20:48PM +0100, Enrico Zini wrote: > However, I cannot connect to signals with more complex signatures, like > org.freesmartphone.Usage.ResourceChanged or > org.freesmartphone.GPS.UBX.DebugPacket. I cannot seem to be able to > concoct a method signature that will properly match the signal, and my > callbacks never get called. > > People on #vala on GimpNet will probably have seen my numerous > unanswered questions in the channel this afternoon. > > Can I have some guidance on this? Is it implemented at all?
I've eventually found out through painful trial and error and study of
the generated C code:
This is how to provide a callback to org.freesmartphone.Usage.ResourceChanged,
with signature sba{sv}:
void on_resourcechanged(dynamic DBus.Object pos,
string name,
bool state,
HashTable<string, Value?> attributes)
{
stderr.printf("Resource %s changed\n", name);
}
And this is how to provide a callback to org.freesmartphone.GPS.UBX.DebugPacket,
with signature siaa{sv}:
void on_ubxdebug_packet(dynamic DBus.Object ubx,
string clid,
int length,
HashTable<string, Value?>[] wrongdata)
{
stderr.printf("Received UBX debug packet");
// Ugly ugly work-around
PtrArray< HashTable<string, Value?> >* data =
(PtrArray< HashTable<string, Value?> >)wrongdata;
stderr.printf("%u elements received", data->len);
}
What is happening here is that the only method signature that I found matching
the dbus signature is this one. However, the unmarshaller for some reason gets
it wrong, and passes a PtrArray instead of a HashTable array. So you need to
cast it back to what you've actually been passed.
I blogged this at http://www.enricozini.org/2009/debian/vala-dbus-signatures/
Ciao,
Enrico
--
GPG key: 4096R/E7AD5568 2009-05-08 Enrico Zini <enr...@enricozini.org>
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