[Qt-interest] UDP Multicast - Any new news ?

[Brad Howes]

On Jan 6, 2010, at 10:02 AM, Dan White wrote:

> Searching the lists, I find that UDP Multicast is not (yet) officially supported and I also find several suggestions about hacking the low level socket inside QUdpSocket.


I was at first confused by your post because I use Qt with autodiscovered multicast connections all the time and was unaware of any limitations. Looking at my code, I see that I do the multicast stuff using the ACE framework, and have a QUdpSocket object that is simply a proxy for the ACE socket. The ACE library contains an ACE_SOCK_Dgram_Mcast class which provides for multicast memberships. I just take its "handle" (socket file descriptor) and use it in a QUdpSocket::setSocketDescriptor call. Then, I can use Qt's API and signaling framework.

So, I'm not really "hacking the low-level socket", I'm just giving QUdpSocket one that is already setup for it to use.

Brad

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Brad Howes
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