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[Jacky Alciné <me@xxxxxxxxxxxxxxxxx>]

Well, a code snippet of how the implementation would typically works
according to QtDBus's documentation would be the following (currently in
the linguistics code branch [lp:~wintermute-devel/wintermute/ling] in
file syntax.cpp on lines 141 - 146; however it's been modified below for
verbose explanation).

/// Not found in the code; but calling it handles an issue that should have been fixed (user-defined type not marshalled).
qDBusRegisterMetaType<Lexical::Data>();

/// The data to send over DBus.
Lexical::Data l_dt(p_id,p_lcl);

/// Converted to a QVariant for simplified transfer (this might be the issue, but I doubt it).
QVariant l_vrnt = QVariant::fromValue(l_dt);

/// Form the method call for D-Bus.
QDBusMessage l_call = QDBusMessage::createMethodCall ("org.thesii.Wintermute.Data","/Nodes","org.thesii.Wintermute.Data.NodeAdaptor","exists");

/// Load the argument call.
l_call << l_vrnt;
qDebug() << "(ling) [Node] <exists>" << p_lcl;

/// Execute the call and obtain a reply.
QDBusMessage l_reply = QDBusConnection::sessionBus ().call(l_call,QDBus::BlockWithGui);


With this is run, the following is printed out as an non-critical error by Wintermute:

(data) [Node] Unable to determine existance of
"1a699ad5e06aa8a6db3bcf9cfb2f00f2" "en" : "No such method 'exists' in
interface 'org.thesii.Wintermute.Data.NodeAdaptor' at object path
'/Nodes' (signature '(ssa{ss}s)')"

This is because the data library seems to not either not call
qDBusRegisterMetaType from System::start() in time, or that maybe the
custom types need to have their own introspection for D-Bus. Either way,
I'm stumped.

-- 
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https://bugs.launchpad.net/bugs/864318

Title:
  Unable to expose user-defined data types over D-Bus

Status in Wintermute:
  New

Bug description:
  Wintermute's self-defined data types for D-Bus usage aren't properly
  serialized.

  When attempting to call a method; however, it causes null information
  to be returned and thus breaking the linguistics system.

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