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

[David K. <zu...@li...>]

Hello Jay,

you might have a look in the archives for:

Date: Tue, 31 Mar 2009 18:10:14 -0400
From: Schmottlach, Glenn
Subject: [dbus-cplusplus-devel] FYI: Asynchronous support for client / 
servers

Best regards,

David


On Tue, 9 Jun 2009, Freyensee, James P wrote:

> Date: Tue, 9 Jun 2009 16:11:54 -0700
> From: "Freyensee, James P" <jam...@in...>
> To: "dbu...@li..."
>     <dbu...@li...>
> Cc: "Ahmed, Suhail" <suh...@in...>,
>     "Benis, Robertino" <rob...@in...>
> Subject: [dbus-cplusplus-devel] Setting the callback function and data in
>     dbus-c++ for async calls
> 
> 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
>
>
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