Re: [Dbus-cxx-users] Feature request with patch proposal: propagate exceptions through DBus

[Robert M. <rmi...@sy...>]

You can attach patches here.  I'll take a look at it, and see about putting
it in.

On a side note, I have been meaning to do exception handling for a while
now, but I haven't gotten around to it.  I know that dbus-java will catch
all exceptions and then return an error message back onto the bus if an
exception is caught or NULL is returned from a function.

-Robert Middleton


On Tue, Oct 8, 2013 at 5:24 AM, <emm...@or...> wrote:

> Hello,
>
> DBus provides the possibility for a method call to throw an error.
> However DBus-cxx in its current shape doesn't mirror this feature; message
> call handlers don't catch exceptions so, if an error condition arises in a
> slot bound to a DBus method, the exception is bubbled all the way up to the
> dispatcher and stops it.
> A possibility is of course to use return codes in APIs exposed over DBus
> rather than throw exceptions but that doesn't feel like the way of modern
> C++.
>
> My proposal would be to call the slot bound to a DBus method in a try
> block and catch std::exception&.
> In the case an exception occured, a DBus error message can be sent as a
> reply to the caller.
>
> I made a patch for that purpose, which I can provide. It might be a little
> quick & dirty though, as I had to change the signature of one of the
> DBus::ErrorMessage constructors (the one that constructs a reply) to accept
> a Message::const_pointer as first argument.
> I don't know if the mailing list is the right place to send the patch.
>
> Thanks in advance for your support.
> Regards,
>
> --
> Emmanuel Raulo-Kumagai
>
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