[Qt-interest] waitForReadyRead() immediate return--why?

[Thiago Macieira]

Joshua Senecal wrote:
>Hi All,
>
>I'm having a bit of difficulty with a QUdpSocket and waitForReadyRead().
>The bottom line is, a call to waitForReadyRead() returns immediately
>with true, but a call to getBytesAvailable() returns 0.

There are two reasons why that could happen:

1) you received a zero-sized UDP packet; those are rare, but they could 
happen

2) you received an ICMP error message to your prior datagram being sent, 
like ICMP Port Unreachable

>Any pointers on what might be causing this? I have one class where
>everything works as expected (waitForReadyRead() blocks until a datagram
>arrives) and in the other class it doesn't. I've gone over the code but
>I don't see any significant differences.

-- 
Thiago Macieira - thiago.macieira (AT) nokia.com
  Senior Product Manager - Nokia, Qt Software
      Sandakerveien 116, NO-0402 Oslo, Norway
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