[dbus-cplusplus-devel] Setting the callback function and data in dbus-c++ for async calls

[Freyensee, J. P <jam...@in...>]

Hello:

I am struggling to understand how I could do an asynchronous call using dbus-c++ and was wondering if anyone has any currently working example code, explanation, or a tutorial to help me out.

This is what I know (I believe at least).

For asynchronous calls I need to call the dbus function 

dbus_bool_t  dbus_pending_call_set_notify ( DBusPendingCall *  pending, DBusPendingCallNotifyFunction  function, void *  user_data, DBusFreeFunction  free_user_data  )

This happens when the constructor 

PendingCall::PendingCall(PendingCall::Private *p) : _pvt(p) {}

is called.  

I believe this PendingCall::PendingCall() constructor called when the function in Connection.cpp:

PendingCall Connection::send_async(Message &msg, int timeout)

is called.  

Now I was thinking that a new, unwritten function in object.cpp needs be written as follows that would call send_async():

PendingCall ObjectProxy::_invoke_method_async(CallMessage &call)
{
	if (call.path() == NULL)
		call.path(path().c_str());

	if (call.destination() == NULL)
		call.destination(service().c_str());

	return conn().send_async(call);
}

This is actually pretty similar to 

Message ObjectProxy::_invoke_method(CallMessage &call) {}

in Object.cpp.

The big question is how do I use this dbus-c++ framework to set the (DBusPendingCallNotifyFunction  function, void *  user_data) parameters of the dbus_pending_call_set_notify() function?  I figure I need to set some parameters in the CallMessage object in ObjectProxy::_invoke_method_async() and/or the Message object in the Connection::send_async().  However, I don't know what to do and how to do it.

Second question- is there anything else I am missing that I would need to do to make the callback operation work right in this dbus-c++ framework?

Thank you for the help!

Regards,
Jay Freyensee