Re: [Vala] How to use GLib.Signal.connect?

[Luca Bruno <lethalman88 gmail com>]

On Tue, Jan 31, 2012 at 4:53 PM, Pete Fotheringham <
pete fotheringham codethink co uk> wrote:

> I am working with Vala and GtkOSXApplication on Mac OS. I am using Vala
> 0.12 because I need to use dbus-glib and, as I understand it, this is not
> supported by versions of Vala beyond 0.12.1
>
> I need to connect to a Mac Specific mac-specific NSApplicationOpenFile
> signal, which is generated by GtkOSXApplication.
>
> If I use the line
>
> > osxApp.NSApplicationOpenFile.**connect(..)
>
> the name of the signal is changed in the generated c code to
> "ns_application_open_file", and when the code is run the following error is
> generated
>
> > GLib-GObject-WARNING **: gsignal.c:2206: signal
> > `ns-application-open-file' is invalid for instance `0x1401d020'
>
> So I try to connect using
>
> > Signal.connect(osxApp, "NSApplicationOpenFile", this.open_file_callback,
> > this);
> and the Vala compiler generates an error
>
> > error: Cannot create delegate without target for instance method or
> > closure
> > Signal.connect(osxApp, "NSApplicationOpenFile", this.open_file_callback,
> > this);
> >                                                ^^^^^^^^^^^^^^^^^^^^^^^
> Can anyone give me an example of how to use Signal.connect() or suggest an
> alternative method?

Cast (Callback)this.open_file_callback

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