Thanks, Ken. The reason I want to do this is to discover the textual path of a file given its file ID (and a volume name). The only way I could come up with to do this was to create a file reference NSURL and then convert it to a file path URL with [NSURL filePathURL]. If there is a better way to do that then that would be great.
You're right, if I create a file reference URL for the volume then I can see the volume ID number I need in its absolute string so that is a workaround for now. But as you have now pointed out the URL format is supposed to be opaque, so that is clearly a fragile solution. So I suppose my real question is how to find the path for a file by its id (its fileSystemFileNumber attribute). I am aware that a file might have multiple paths if there are hard links to it. -- Ben. On 24 Sep 2013, at 09:04, Ken Thomases <k...@codeweavers.com> wrote: > On Sep 23, 2013, at 11:14 AM, Ben Staveley-Taylor wrote: > >> Does anyone know how to get the volume ID number to use in a reference URL? >> >> I am working with file reference URLs as returned by - (NSURL >> *)fileReferenceURL. These have this textual form: >> >> file:///.file/id=<volume_id>.<file_id>/ >> e.g. file:///.file/id=6571367.2773272/ >> >> I want to compose a reference URL for a file whose file_id I know. > > Why would you want to do that? > > In any case, it's not supported. From "NSURL and CFURL Release Notes: File > Reference URLs" > <https://developer.apple.com/library/mac/releasenotes/Cocoa/RN-NSURL/#//apple_ref/doc/uid/TP40007753-CH1-DontLinkElementID_2>: > > "The syntax of a file reference URL should be considered opaque, and may > change from release to release." > > >> I know the textual path of the volume it is on (e.g "/Volumes/Bob"). I can't >> figure out how to get the volume ID to use from the volume name or path > > I hesitate to suggest this, but have you tried creating an NSURL for a file > path on the volume and then asking it for its file-reference-URL form? > > ... > -Ken > _______________________________________________ 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
