Re: error in setting speakergain in own application

[Bastien Nocera <hadess@hadess.net>]

On Wed, 2009-09-02 at 20:11 +0200, Peter Kornatowski wrote:
> -------- Original-Nachricht --------
> > Datum: Wed, 02 Sep 2009 15:37:59 +0100
> > Von: Bastien Nocera <hadess@hadess.net>
> > An: Peter Kornatowski <pkorn@gmx.net>
> > CC: linux-bluetooth@vger.kernel.org
> > Betreff: Re: error in setting speakergain in own application
> 
> > On Wed, 2009-09-02 at 13:52 +0200, Peter Kornatowski wrote:
> > > Hi,
> > > 
> > > I have a linux application where i do some stuff with bluez (4.50) over
> > dbus. I have 3 headsets with which I test (Jabra BT530, Sora B-Speech,
> > official PS3-BT headset) and on all I get the same behaviour/error.
> > > 
> > > I would like to set the speakergain of a headset from my linux-app. I
> > tried two methods:
> > > 
> > > a) call the method "SetProperty":
> > > 
> > > GValue value;
> > > value.g_type = 0; // also tried: value = { 0 };
> > > guint16 ugain = (guint16)gain; // also tried: guint ugain = (guint)gain;
> > > g_value_init(&value, G_TYPE_UINT);
> > > g_value_set_uint(&value, ugain);
> > > dbus_g_proxy_call(proxy, "SetProperty", &error, G_TYPE_STRING,
> > >   "SpeakerGain", G_TYPE_VALUE, &value, G_TYPE_INVALID, G_TYPE_INVALID);
> > 
> > This would work (and you don't need to use a GValue, the call will take
> > care of marshalling the value to the proper type:
> > dbus_g_proxy_call(proxy, "SetProperty", &error, G_TYPE_STRING,
> >   "SpeakerGain", G_TYPE_UINT, ugain, G_TYPE_INVALID, G_TYPE_INVALID);
> 
> Thanks for the idea, but now I get the following error:
> Method "SetProperty" with signature "su" on interface "org.bluez.Headset" doesn't exist
> 
> So the value is not set to the proper type, it still remains "u".
> Do you have any other ideas?

Never mind, I didn't read your code properly.

The original code should work, given that the proxy used is the correct
one. Check what path the proxy object has using dbus_g_proxy_get_path()
and check against what you see in D-Feet (repeat with the name and
interface if you didn't find a discrepancy).

Cheers