On Sep 16, 2013, at 4:38 AM, Mike Abdullah <mabdul...@karelia.com> wrote:
> > On 14 Sep 2013, at 21:14, Brian Clark <ba-cl...@comcast.net> wrote: > >> I'm hoping someone can suggest the correct way to deal with the following >> problem. >> >> For an image viewing app i display a file in the usual way in an NSDocument. >> setFileURL: is properly called by NSDocument's >> _initWithContentsOfURL:ofType:error:. >> >> I now want to display the next file in the folder, and move the old file to >> the Trash. To do this I do the necessary file reading tasks and call >> setFileURL: with the new file URL. I then move the old file to the trash >> (using NSFileManager 's trashItemAtURL:resultingItemURL:error: but using >> different methods gives the same result.) > > What are "the necessary file reading tasks"? Rather than call -setFileURL: > yourself, have you tried calling -revertToContentsOfURL:ofType:error: > instead? The top of the class documentation briefly notes that it should > always be used for re-reading documents. The "necessary tasks" are readFromURL:ofType:error: and the other chores associated with setting up the document state for the different image file. Using -revertToContentsOfURL:ofType:error: instead does not work. After doing this NSDocument still seems to treat the old URL as the file's document, and I still get presentedItemDidMoveToURL: for the old file URL when it is moved to the Trash AFTER I-ve called revertToContentsOfURL:ofType:error:. While revertToContentsOfURL:ofType:error: may work correctly for the cases for which I guess it was intended (as described by the NSDocument Class Reference), it doesn't seem to work for this case, for reasons unknown. The best work-around I've found is to add a file reference URL to my NSDocument subclass, and set it in an override of setFileURL:. Then in an override of presentedItemDidMoveToURL: I test if the saved file reference URL is the same as the new URL, and do nothing if they're not the same file. That seems to work, but it's a bit of a hack, and I'd really like to understand if NSDocument is simply broken in this regard, or why setFileURL: does not work and what is the correct and reliable way to change the URL for an open document. _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
