Re: Making a String from a non-NSString
Re: Making a String from a non-NSString
- Subject: Re: Making a String from a non-NSString
- From: Shawn Erickson <email@hidden>
- Date: Tue, 27 Jan 2004 08:53:28 -0800
On Jan 27, 2004, at 8:12 AM, Michael Becker wrote:
Hi!
This problem is a little hard to explain, so please bear with me :-)
I recently stumbled over the XMLTree-class by R.Harder
(iharder.sourceforge.net), which is a simple objective-c wrapper for
the CoreFoundation XML-functions. It works fine so far, but I run into
problems when I want to compare elements. Here's the situation:
This is a part of my XML-file (yes, it's iPhoto's AlbumData.xml :-))
<key>Archive Path</key>
<string>/Users/johndoe/Pictures</key>
And here is the code-part (XMLTree is defined as a subclass of
NSObject):
XMLTree* myTree;
[ . . . ]
NSLog(@"%@", [ myTree childAtIndex: 0 ]); // This produces an output
of the correct value "Archive Path"
NSString* currentKey = (NSString*) [ myTree childAtIndex:0]);
NSLog(@"%@", currentKey); // This also produces an "Archive Path"
if ([ currentKey isEqualToString:@"Archive Path"]) // THIS, however,
produces a runtime error "[ XMLTree -isEqualToString:] selector not
found"
Long story short: -childAtIndex: returns another XMLTree, but
obviously it also holds the correct value (see the NSLogs above).
Since there is no method in the class for explicitly returning the
element value, is there ANY way I can get my comparison working?
Talk with R. Harder about it...? I doubt method don't exist to do what
you want. I also wouldn't cast what you get back from childAtIndex to a
NSString since it is obviously not always such an object, use id or
something...
I can think of two things to try (not knowing the XMLTree class but
based on info from the above only)...
[[currentKey description] isEqualToString:@"Archive Path"]
or
[@"Archive Path" isEqualToString:currentKey]
Anyway I am not sure you need to be using xml parsing classes for the
above. The snippet sure looks like property list xml
(
http://developer.apple.com/documentation/Cocoa/Conceptual/
PropertyLists/index.html).
-Shawn
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