Re: Cocoa versus Carbon networking issue.
Re: Cocoa versus Carbon networking issue.
- Subject: Re: Cocoa versus Carbon networking issue.
- From: j o a r <email@hidden>
- Date: Fri, 6 Jan 2006 16:21:32 +0100
On 6 jan 2006, at 15.26, Kenny Millar wrote:
I discovered that I can ping the .119 address by both ip address
and host
name
I can ping the .120 address only by ip address and NOT by host name.
What I have discovered by using the debugger is that the
'hostWithAddress'
message is returning a host, containing the hostname, not the IP
address
(despite only providing the ip address). So it is getting the host
name by
some opaque method. Of course the getStreamsToHost message the fails,
because that host is not available via it's hostname.
So, you have some sort of DNS error on your network. That is probably
something you would want to look into. But, besides that problem, I
agree that if you provide an IP address, there is not really any
point for NSHost to try to resolve it to a host name, and discard the
actual IP address, just for the fun of it. Perhaps that should be
filed as some sort of bug report.
Now, I knocked up a quick test in Carbon using it's equivalent
functions,
and guess what? It all works fine in Carbon - the ip address does
NOT get
munged to a hostname. The carbon fn I'm using is
CFStreamCreatePairWithSocketToHost(...) .
CoreFoundation is not part of Carbon or Cocoa. If you, for whatever
reason, would want to shoe-horn it into one of them, I would say that
it fits better into Cocoa - because of coding guidelines, naming
conventions, memory management, toll-free bridged objects, et.c.
So how can I force getStreamsToHost to use the ip address and not the
hostname? It seems there is no way to do it.
Use the CF function you just mentioned to create your stream objects,
and then cast them to their NS equivalents. CFStream and NSStream
objects are "toll-free bridged":
<http://developer.apple.com/documentation/Cocoa/Conceptual/Streams/
Articles/CocoaStreamsOverview.html>
And so, can be freely intermingled (mostly).
j o a r
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