[Qt-interest] QUdpSocket's writeDatagram source port

[Valentin Iliu]

Funny enough, if I do  udpSocket->bind(), I get the response in the callback function, precisely from the side where I wrote the packets towards with writeDatagrams.

But calling bind() with no arguments is actually calling bind(0), which means "listen to any port"?!  If so, that's not acceptable for me, because I want the callback function to deal with only the other side's response, not with any message coming to my app via UDP...


--- On Tue, 10/27/09, Markus Goetz <Markus.Goetz at nokia.com> wrote:

From: Markus Goetz <Markus.Goetz at nokia.com>
Subject: Re: [Qt-interest] QUdpSocket's writeDatagram source port
To: "ext Valentin Iliu" <valentiniliu at yahoo.com>
Cc: "qt-interest at trolltech.com" <qt-interest at trolltech.com>
Date: Tuesday, October 27, 2009, 11:22 AM

ext Valentin Iliu wrote:
> Hello everyone.
> 
> I need to find a way to detect what source port is writeDatagram using when it runs, so I can bind to that port and listen for responses to what writeDatagram is sending out.
> 
> I notice it would usually pick 5060, but if it cannot use that one, it picks some different port in what looks to me like random fashion.
> 
> It seems like Wireshark knows both the source and the destination port of a packet. Which means it's not impossible to detect that source port. How do I do that in Qt?
> 
> Thanks!
> 
> 
Does http://doc.trolltech.com/4.5/qabstractsocket.html#localPort return the correct port?

Markus



      
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