On Aug 4, 2010, at 19:48, Gideon King wrote:

> 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"];

I don't have any answers, but I was going to contribute some questions, then I 
realized that I don't quite understand the above. Apologies if you explained 
this in your original post.

What's the mechanism that gets to step 1 in the above -- File | New? File | 
Open? File | Import? (Meaning, by the first two, the standard actions that get 
dispatched to NSDocumentController.)

I assumed, from your statement that readFromURL:ofType:error: is invoked, that 
this was coming from a File | Open of the file to be converted. Is the file 
needing conversion a Core Data store? Or a non-Core Data file of some kind? (If 
the latter, I'm not sure why you think its safe to use NSPersistentDocument.)


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