How to know when D-Bus interfaces and methods are available

Thiago Macieira thiago at
Wed Aug 5 14:43:00 BST 2009

Em Quarta-feira 05 Agosto 2009, às 10:09:40, Kevin Krammer escreveu:
> How about creating a QDBusInterface without specifying an object path and
> let the adapter emit a signal with the object path. Then creating a
> QDBusInterface for that specific object.

You can't create a QDBusInterface without object path. QDBusInterface requires 
a running and existing object when it's created so that it may introspect.

You must use an interface generated by qdbusxml2cpp to use it without object 
paths. You can also use it without service names. This kind of interface 
cannot be used for calling, but it can be used to connecting to signals.

So your object could emit a signal when it's ready to be used. The target 
application would then receive it and create the QDBusAbstractInterface with 
service and object path.

If you already know the service and object path though, you can use 
QDBusAbstractInterface directly, even if the object doesn't exist yet. You 
just have to be careful about making calls.

Thiago Macieira - thiago (AT) - thiago (AT)
  Senior Product Manager - Nokia, Qt Software
      PGP/GPG: 0x6EF45358; fingerprint:
      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358
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