Re: Getting error info when NSSocketPort initWithTCPPort fails
Re: Getting error info when NSSocketPort initWithTCPPort fails
- Subject: Re: Getting error info when NSSocketPort initWithTCPPort fails
- From: Rick Hoge <email@hidden>
- Date: Fri, 30 Jul 2004 07:59:03 -0400
Thanks very much for the suggestions, Wade
Turns out this was (what else?) a series of dumb mistakes on my part.
Checking in /etc/services on the problem systems revealed a conflict
with another service that must have been intermittently polling the
port. The port number I was using on those systems was one persisting
from code snippets I'd grabbed from tutorial examples - certainly a
*bad* idea.
In retrospect it's kind of funny/scary that virtually all the tutorial
examples or code snippets i found posted in discussion forums did not
test for the return value of initWithTCPPort:. In the one case where
there was a test, it was an if (thePort != nil) block with no else for
handling the nil case. Of course ultimately this is my fault for not
paying more careful attention to this (and it's possible I missed some
better examples), but to anyone else out there coding this stuff -
don't assume initWithTCPPort: won't return nil!
If it's the problem I've suggested, that won't be of much help.
Trying different ports should resolve the issue in any case, so if
your program can handle that (i.e. it uses Rendezvous anyway, so a
known port is unnecessary) then by all means.
I notice that the simple 'init' method for the NSSocketPort class has
the following description:
Initializes the receiver as a local TCP/IP socket of type SOCK_STREAM.
The port number is selected by the system.
It sounds like this would take care of the port testing and return the
first available port found.
Wade Tregaskis (aim: wadetregaskis)
-- Sed quis custodiet ipsos custodes?
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