Hello Gtkmm developers and users,
I am currently using Gtkmm to develop an embedded Linux UI.
So far I have been able to find all relevant information in the Gnome and Gtkmm
documentation -> good work!
However, now I stumbled upon a problem I cannot figure out myself. I am trying
to read a DBus property using get_cached_property(). The property variant has
the form a{q(qsb)} meaning a dictionary/map with uint16 keys and tuple values.
I have tried following to read the variant:
Glib::Variant< std::map<guint16, Glib::VariantContainerBase> > driver_map;
m_userman->get_cached_property(driver_map, "DriverList");
auto data = driver_map.get();
Throws following error:
In file included from
/usr/include/glibmm-2.4/glibmm/containerhandle_shared.h:25:0,
from /usr/include/glibmm-2.4/glibmm/object.h:34,
from /usr/include/giomm-2.4/giomm/dbusconnection.h:29,
from dbushandler.h:3,
from dbushandler.cpp:1:
/usr/include/glibmm-2.4/glibmm/variant.h: In instantiation of 'std::pair<_T1,
_T2> Glib::Variant<std::pair<_T1, _T2> >::get() const [with K = short int; V =
Glib::VariantContainerBase]':
/usr/include/glibmm-2.4/glibmm/variant.h:1722:5: required from 'std::map<K, V>
Glib::Variant<std::map<K, V> >::get() const [with K = short int; V =
Glib::VariantContainerBase]'
dbushandler.cpp:88:36: required from here
/usr/include/glibmm-2.4/glibmm/variant.h:1549:48: error: 'class
Glib::Variant<Glib::VariantContainerBase>' has no member named 'get'
std::pair<K, V> result(key.get(), value.get());
^
/usr/include/glibmm-2.4/glibmm/variant.h: In instantiation of 'static const
Glib::VariantType& Glib::Variant<std::pair<_T1, _T2> >::variant_type() [with K
= short int; V = Glib::VariantContainerBase]':
/usr/include/glibmm-2.4/glibmm/variant.h:1643:71: required from 'static const
Glib::VariantType& Glib::Variant<std::map<K, V> >::variant_type() [with K =
short int; V = Glib::VariantContainerBase]'
/usr/include/glibmm-2.4/glibmm/variant.h:1731:53: required from
'Glib::VariantIter Glib::Variant<std::map<K, V> >::get_iter() const [with K =
short int; V = Glib::VariantContainerBase]'
/usr/include/glibmm-2.4/glibmm/variant.h:1717:30: required from 'std::map<K, V>
Glib::Variant<std::map<K, V> >::get() const [with K = short int; V =
Glib::VariantContainerBase]'
dbushandler.cpp:88:36: required from here
/usr/include/glibmm-2.4/glibmm/variant.h:1520:29: error: 'variant_type' is not
a member of 'Glib::Variant<Glib::VariantContainerBase>'
Variant<V>::variant_type().gobj()));
I also tried this second approach:?
?
Glib::Variant< std::map<guint16, Glib::Variant<std::vector<Glib::VariantBase> >
> > driver_map;
m_userman->get_cached_property(driver_map, "DriverList");
auto data = driver_map.get();
?
Which throws following error at runtime:
(launcher:10778): GLib-CRITICAL **: the GVariant format string 'a{qv}' has a
type of 'a{qv}' but the given value has a type of 'a{q(qsb)}'
(launcher:10778): GLib-CRITICAL **: g_variant_get: assertion
'valid_format_string (format_string, TRUE, value)' failed
(launcher:10778): GLib-CRITICAL **: g_variant_iter_next_value: assertion
'is_valid_iter (iter)' failed
Does anyone have an idea how to decode this type of variant in Glibmm?
Best regards,
Alexander
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