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Versionsapp (Subversion) and Static Libraries

Nick — Tue, 01 Jun 2010 08:55:20 +0000

Ever since the kind people at versionsapp.com have given me a free license to use their awesome product I have been enjoying it a lot.

Today I imported an existing iPhone project and then checked it out again. To my surprise when I tried to build it I encountered an error. I checked my SVN repository and discovered that a static library ( .a) was not there.

Apparently .a files are treated as hidden files and they don’t get added to the repository. If you want to “fix” this in Versions app then select View -> Show Ignored Items (⌘ + ⇧ + I) and then simply add and commit.

It’s not hard, you just need to know what to look for.

Cheers…

Solved: Mac OS X (Snow Leopard) and SVN (1.6.2)

Nick — Sat, 07 Nov 2009 05:01:31 +0000

Today I spent a few hours trying to figure out why Eclipse was unable to connect to my locally running Subversion server. I was annoyed especially because Xcode and Terminal were not having any issues.

Some background information.
- SVN is running as a daemon locally. It gets started by:
svnserve -d –listen-host localhost -r /Library/Subversion/Repository

- trying to checkout stuff using the command below via Terminal works fine
svn co svn://localhost/Project1/trunk WorkingDirName

- trying to browse the svn repository from within Eclipse 3.5 Galileo using either Subclipse or Subversive always ends up with:
svn: connection refused by the server

I tried many things but none of them helped. I googled but failed to find something relevant. Just before giving up I thought I would check what ports were open on my machine, maybe there was some conflict. There was no conflict but…
netstat -anp TCP | grep LISTEN
returned this:
tcp6 0 0 ::1.3690 *.* LISTEN
That’s when it dawned on me: the svnserve was binding an IPV6 address and Eclipse could not handle that!

Solution:
ps -ef | grep svnserve
kill -9 (where proc_id is the process id of your svnserve, the second number on the line)
svnserve -d –listen-host 127.0.0.1 -r /Library/Subversion/Repository/ (or wherever you’ve placed your Repository)

Done! Now svnserve is bound to an IPV4 and Eclipse can play nice too.

Cheers…

p.s. please let me know if this worked with other Mac OS / SVN versions too

JSON Framework — Potential Null Dereference

Nick — Mon, 05 Oct 2009 23:58:46 +0000

If you are using json-framework as your preferred iPhone / Cocoa Touch JSON framework then you might find that the SBJSON.m is not necessarily perfect.
Don’t get me wrong, it is an awesome utility and it has saved me heaps of time but when analyzing the code (with XCode 3.2) I got lots (36 or so) of Potential null dereference warnings.

The reason for it is that when this the error is built in lines like this:

*error = err(EUNSUPPORTED, @"JSON object key must be string");

The error object is not checked for NULL.
According to Apple’s documentation one can call a method that takes a error:(NSError**)error parameter with either of these:
NULL
NSError *error = nil;

So if the argument is NULL you can’t really assign something to it.

To fix the XCode warnings (and your code) just do this test before the call to create a new error object.

if (error != NULL)
  *error = err(EUNSUPPORTED, @"JSON object key must be string");

Cheers…