Re: [Vala] Copy function produces segmentation fault

[Lewis Gunsch <lgunsch gmail com>]

On Wed, May 18, 2011 at 3:21 AM, Luca Bruno <lethalman88 gmail com> wrote:

> On Tue, May 17, 2011 at 01:55:57PM -0600, Lewis Gunsch wrote:
> > Hi,
> >
> > I have been writing a Vapi for the ZeroMQ library:
> http://www.zeromq.org/. I
> > would eventually like it to be distributed with Vala itself, and would
> > propose myself as the maintainer.
> >
> > See the vapi here:
> > https://github.com/lgunsch/zmq-vala/blob/master/libzmq.vapi
>
> Would you add a link to http://live.gnome.org/Vala/ExternalBindings ?
Done. I added the link to the bottom of the list.


>  > Although, I am having some trouble getting the MSG.Msg.copy() message
> copy
> > function to work correctly. It produces a segmentation fault. I am unsure
> > how to go about fixing this issue. You can see the docs for the libraries
> > copy function below.
> >
> > http://api.zeromq.org/2-1:zmq-msg-copy
>
> Try with:
> [CCode (instance_pos = 2)]
> public int copy (out Msg dest);
>
> Use as:
> Msg copy;
> int res = somemsg.copy (out copy);
After digging around, I found out that a message has to be initialized
before copying. Because it has to be initialized, I can't use the out
parameter, but it looks like the ref parameter would make sense here.

[CCode (instance_pos = 2)]
public int copy(ref Msg dest);

Used as:
Msg copy = MSG.Msg ();
int res =  msg.copy (ref copy);

~Lewis