On Jan 10, 2020, at 07:36:03, Gabriel Zachmann via Cocoa-dev
<cocoa-dev@lists.apple.com> wrote:
>
> So, is .../Containers/.../Data/Pictures linked to ~/Pictures automatically?
Yes. That's under-the-hood stuff that you should mostly ignore. Pretend it
doesn't exist. The OS will do what it needs to do.
> I am searching that directory (if the user did not specify any other
> directory) for images using Spotlight.
> Apparently, Spotlight starts delivering images to my screensaver, and at some
> point it gets killed or hangs. I was wondering if that happens when
> Spotlight tries to deliver images from the Photos database (which is also
> stored in ~/Pictures).
I dunno. Is there some error returned?
> Do I have to do anything special to ensure that?
> Currently, I am using this very simple code:
>
> - (IBAction) selectDirectory: (id) __attribute__ ((unused)) sender
> {
> NSOpenPanel *oPanel = [NSOpenPanel openPanel];
> long int result;
>
> NSURL * url = [[oPanel URLs] objectAtIndex: 0];
You can also just use oPanel.URL if you only expect 1 file, otherwise you
should loop through oPanel.URLs.
> NSString * aDir = [url path];
As long as you're not storing and reloading that path, but storing and loading
security scoped bookmarks to urls instead, using a path created at runtime is
fine. I prefer using urls instead, because that way you don't have to worry
about some of this stuff. Most APIs that accept a path also have methods that
use an NSURL. I suggest you use them.
>> and I store security-scoped bookmark data for each url they choose.
>
> How do I do that? how would I use such url's?
> Could you explain this a bit further, or maybe you can provide a pointer
> where I can read up on this?
Read this entire document - all sections. It explains the Container, security
scoped bookmarks, etc. In fact, read it a couple times.
https://developer.apple.com/library/archive/documentation/Security/Conceptual/AppSandboxDesignGuide/AboutAppSandbox/AboutAppSandbox.html
Then look for examples of using:
bookmarkDataWithOptions:includingResourceValuesForKeys:relativeToURL:error:
URLByResolvingBookmarkData:options:relativeToURL:bookmarkDataIsStale:error:
and
startAccessingSecurityScopedResource
stopAccessingSecurityScopedResource
The last two are important - always balance the use of one with the other.
--
Steve Mills
Drummer, Mac geek
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