Re: arrayWithContentsOfFile
Re: arrayWithContentsOfFile
- Subject: Re: arrayWithContentsOfFile
- From: Graham Cox <email@hidden>
- Date: Wed, 14 Oct 2009 10:35:07 +1100
On 14/10/2009, at 6:52 AM, DKJ wrote:
if( data == nil )
do this;
------------------------------------
There's no file.plist in the directory. But "do this" doesn't get
done.
However, "do this" does get done when I have this:
------------------------------------
if( [data count] == 0 )
do this;
------------------------------------
So it looks like arrayWithContentsOfFile: is returning an empty
array when file.plist doesn't exist.
Note that the test for [data count] == 0 will work as a test whether
the method returns nil or an empty array. If it returns nil, the
message [nil count] is legal and will always return 0. So that
approach catches both possibilities, so the question of whether the
docs are wrong (unlikely, but I can't see the problem either) goes away.
Similarly, tests such as [string length] > 0 also catch both nil
strings and empty ones, so kill two birds with one stone. You don't
need to bother with things like if( string && [string length] > 0 )...
--Graham
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