[Interest] MultiCast problem. QAbstractSocket::ShareAddress no effect?

[Mandeep Sandhu]

On Tue, Sep 10, 2013 at 3:52 PM, Guido Seifert <wargand at gmx.de> wrote:

>
> > In the example that you showed (in your previous mail), did bind() return
> > true? The docs state that the the socket must be in 'BoundState' for
> > joinMulticastGroup() to work (otherwise it returns false). Maybe you can
>
> Hi, I am now quite sure that it is a bug. And more importantly not a
> stupid bug in my code. :-)
>
> I 'dropped' my code and used the multicastreceiver from the Qt network
> examples for further tests. The only thing I changed in this code is the
> groupaddress to 239.255.255.250 and the port to 1900. Under Windows
> (Windows 7/mingw-4.8.1/Qt-5.1.1/all 64bit) I can see the UPnP multicast
> messages when I start XBMC on the same machine. Under Linux (gcc
> 4.8.1/Qt-5.1.1/Debian Sid/64bit) no such messages are shown. According to
> wireshark none are sent. Naturally, if this port is blocked by
> multicastreceiver.
>
> And just now I checked the return value of bind under Linux.
> The first time I get 'true'. When I start a second instance of
> multicastreceiver I get 'false'.
>

What does QAbstractSocket::error() say when the 2nd bind() call fails?
Maybe that'll give some hint about the error.

-mandeep


>
> I just reported it:
> https://bugreports.qt-project.org/browse/QTBUG-33419
>
> Guido
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