Re: Opening a file but not associating with NSDocument
Re: Opening a file but not associating with NSDocument
- Subject: Re: Opening a file but not associating with NSDocument
- From: Rick Mann <email@hidden>
- Date: Thu, 19 May 2016 23:40:33 -0700
> On May 19, 2016, at 22:16 , Jerry Krinock <email@hidden> wrote:
>
>
>> On 2016 May 19, at 16:13, Rick Mann <email@hidden> wrote:
>>
>> I have a complex NSDocument with lots of files. One of those files is has a .mfst extension. If the user double-clicks one of those files, I want my app to create my NSDocument subclass, and then call a method on it to read the contents of that file, but I don't want that to be the file it then associates with the document. The actual on-disk representation is a package, and can either copy the originally-opened file contents into the package, or reference that file with an alias.
>>
>> At some point, the user will have to specify a location for the "real" document package to live. Conversely, if the user double-clicks on the real document package, I want that to behave as expected.
>>
>> How do I set up my Document Types and handle this scenario?
>
> You will need two document types (CFBundleDocumentTypes) in your Info.plist, one for your .mfst document, and one for the “real” document (NSDocument subclass / package). The .mfst should have its “role” (CFBundleTypeRole) set to “Reader” and will have no windows. In its -readFromURL:ofType:error:, or later, it will programatically create a “real” document by invoking -[NSDocumentController makeUntitledDocumentOfType:error:]. Cocoa will present the Save dialog the user clicks File > Save. Then make your alias or move the original file with NSFileManager, or if this is a Core Data document, consider using BSManagedDocument which has methods to read and write so-called “additional content” into document packages.
By "Reader," do you mean "Viewer?" I see no "Reader" option.
Also, what do you mean "have no windows?" I just don't create anything in -makeWindowControllers?
> In the Document-Based App Programming Guide for Mac, read > Alternative Design Considerations > Multiple Document Types Use Multiple NSDocument Subclasses.
Yeah, I've read through that.
I'm currently doing this. I have the two document types as you described, but both point to the same NSDocument subclass. In readFromFileWrapper(), if it's the .mfst type, I read the data in that I can, and then:
self.fileURL = nil
self.updateChangeCount(.ChangeReadOtherContents)
So far, this does what I would expect (creates a new document with info from the .mfst file, but if I close it, it prompts to Save As).
I have yet to write my saving code, so I don't know if this works.
--
Rick Mann
email@hidden
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