Comments on: Read and Write Array, Dictionary and Other Collections to Files http://iPhoneDeveloperTips.com/data-file-management/read-and-write-array-dictionary-and-other-collections-to-files.html Tips and Tricks for iPhone developers Sun, 05 Sep 2010 15:32:31 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Stephen Campbell http://iPhoneDeveloperTips.com/data-file-management/read-and-write-array-dictionary-and-other-collections-to-files.html/comment-page-1#comment-12386 Stephen Campbell Wed, 31 Mar 2010 22:13:36 +0000 http://iPhoneDeveloperTips.com/?p=5492#comment-12386 Hi Bill, I'm using code similar to what you've written above. However, writeToFile returns NO when I try to write an array to a file, and the file remains empty. I've used [[NSFileManager defaultManager] isWritableFileAtPath:locFilePath] to verify if the file exists, and is writable, which it is. I can also see the file in the file system using Finder. It is currently empty. The array I'm trying to write is an array of dictionary objects. Do you know if there's a way I can troubleshoot this? Many thanks, Stephen C Hi Bill,
I’m using code similar to what you’ve written above. However, writeToFile returns NO when I try to write an array to a file, and the file remains empty.

I’ve used [[NSFileManager defaultManager] isWritableFileAtPath:locFilePath] to verify if the file exists, and is writable, which it is. I can also see the file in the file system using Finder. It is currently empty.

The array I’m trying to write is an array of dictionary objects.

Do you know if there’s a way I can troubleshoot this?

Many thanks,
Stephen C

]]> By: John Muchow http://iPhoneDeveloperTips.com/data-file-management/read-and-write-array-dictionary-and-other-collections-to-files.html/comment-page-1#comment-9684 John Muchow Wed, 17 Feb 2010 20:13:52 +0000 http://iPhoneDeveloperTips.com/?p=5492#comment-9684 Hey Bill, If I understand your question, yes, if you use mutable classes, I would think you could read into those objects, make changes, then write those same objects back to the system. Hey Bill,

If I understand your question, yes, if you use mutable classes, I would think you could read into those objects, make changes, then write those same objects back to the system.

]]> By: Bill http://iPhoneDeveloperTips.com/data-file-management/read-and-write-array-dictionary-and-other-collections-to-files.html/comment-page-1#comment-9683 Bill Wed, 17 Feb 2010 20:10:16 +0000 http://iPhoneDeveloperTips.com/?p=5492#comment-9683 Interesting, I was going to play with something similar in the next couple of weeks. Q: If I now want to update the Array or Dictionary, would I instead use Mutable objects and simply call "writeToFile: xxxxxPath atomically:YES" (where xxxxx is array or dict)? Thanks. Interesting, I was going to play with something similar in the next couple of weeks.

Q: If I now want to update the Array or Dictionary, would I instead use Mutable objects and simply call “writeToFile: xxxxxPath atomically:YES” (where xxxxx is array or dict)?

Thanks.

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