On Aug 4, 2010, at 7:48 PM, Gideon King <gid...@novamind.com> wrote:

> I think maybe my explanation could be clearer. Here's the flow:
> 
> 1. User initiates import of file of type "fred"
> 2. I pick that up in -readFromURL:ofType:error:, and spawn a process which 
> converts files of type "fred" to type "myfiletype", the native file type of 
> the application. Let's say that it is stored in a file called 
> /MyImports/file.mytype.
> 3. Still in -readFromURL:ofType:error:, I call super, telling it to load the 
> converted file, and then call [self setFileURL:nil]; [self 
> setFileType:@"myfiletype"];

Ouch, this sounds like a bad idea. I would expect -fileURL to return something 
meaningful after -readFromURL:ofType:error:.

Have you thought of putting this conversion logic in a subclass of 
NSDocumentController instead? That way you don't violate NSDocument's 
expectation of being associated with the file it was opened from.

--Kyle Sluder_______________________________________________

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