[gstreamer-bugs] [Bug 640878] g_object_set() for a plug-in property

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=640878
  GStreamer | gstreamer (core) | unspecified

Tim-Philipp Müller <t.i.m> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |t.i.m at zen.co.uk
         Resolution|                            |INVALID
   Target Milestone|HEAD                        |NONE

--- Comment #2 from Tim-Philipp Müller <t.i.m at zen.co.uk> 2011-01-29 18:08:15 UTC ---
> the below statement throws a warning:
> g_object_set(G_OBJECT(plugin), "property1", 451260000, NULL);
> 
> and the warning is:
> GLib-GObject-WARNING **: IA__g_object_set_valist: object class `plugin'
> has no property named "<_my_function_name>"
> 
> ------------------------------------------------------......
> if it is tried as below, it works
> gint64 max = 451260000;
> g_object_set(G_OBJECT(plugin), "property1", max, NULL);
> 
> why this happens?

Because g_object_set() is a vararg function that expects the parameters passed
to be exactly of the type that the property is. The compiler doesn't know in
this case that 451260000 is supposed to be a 64-bit integer, and will hence
just pass a normal integer, which means that parsing will be messed up and the
NULL terminator won't be recognised properly, so it'll just continue looking
for arguments. You're lucky that you just get that warning and not a crash.

This is not a bug, closing. If you have further questions, please ask on the
mailing list, thanks!

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