Re: Handling of paths through sandbox
On Feb 11, 2020, at 09:00 , Gabriel Zachmann via Cocoa-dev wrote: > > I have a question regarding the proper handling of paths under Catalina, > some of which go through the Container, some don't. > > More specifically, I get the Pictures folder using this line of code: > > dir_to_scan = [NSHomeDirectory() stringByAppendingPathComponent: > @"Pictures/"] Well, don’t do that. :) Instead, use one of the two NSFileManager methods that find the Pictures directory for you: URLsForDirectory:inDomains: URLForDirectory:inDomain:appropriateForURL:create:error: (You can specify nil for the “appropriateForURL” parameter.) Specify NSPicturesDirectory for the directory parameter, and NSUserDomainMask for the domain. Note that the documentation says you can use URLs in the query’s search scopes, so you don’t need to convert to paths at all. > This gives me a path like > /Users/zach/Library/Containers/com.apple.ScreenSaver.Engine.legacyScreenSaver/Data/Pictures > EXCEPT, apparently, Spotlight gives me paths starting with > /Users/zach/Pictures ! > (which does make some sense.) Yes, some of the items in the container, which are named as if they are standard directories, are actually symbolic links to the real directories outside the container. > Problem is that I can't just do > > [ array_with_all_images addObject: [path substringFromIndex: ([dir_to_scan > length] + 1)] ]; What is this supposed to be an array of? File names? Partial paths underneath ~/Pictures? If the latter, why get partial paths at all, why not just make an array of URLs? ___ 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
Catching keystrokes in my screensaver under Catalina
I used to be able to catch keystrokes in my screensaver under Mojave by defining my own methods -keyDown: and/or -processKey: This does not work any more under Catalina, it seems. My screensaver gets killed (stopped) right away. Not even -(void)stopAnimation is called any more! Does anyone have an idea, how I might be able to capture keystrokes while my screensaver is running? (This used to be one of the unique features of my screensaver.) I will appreciate very much any kinds of insights , hints, pointers, or examples! Best regards, Gabriel ___ 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
Re: Sorting an array
Great! Thanks a lot. (Just for the record: it's called sortUsingSelector: ) Best regards, Gabriel ___ 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
Re: Sorting an array
> On Feb 11, 2020, at 4:59 AM, Gabriel Zachmann via Cocoa-dev > wrote: > > First of all, what are the advantages/disadvantages of either method? Sort descriptors are data; selectors are [references to] code. So a sort descriptor lets you configure the sorting without having to write any custom code, and there's a standard API for it. For this reason they're used by NSTableView to represent the column sorting, and by NSArrayController. If you're hardcoding the sort order, which it looks like you are, then it's probably simpler just to go the code route and sort using a selector. (Note that there are also sort methods that take an NSComparator, which is just a typedef for a block. This is very convenient for custom sorts. > Second, I was wondering if I could write the second method like this: > >imagefiles_ = [imagefiles_ sortedArrayUsingSelector: > @selector(localizedStandardCompare:) ]; That won't work since imageFiles_ is a mutable array, and -sortedArrayUsingSelector: returns an immutable array. Use the mutable version, -sortArrayUsingSelector:, instead. —Jens ___ 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
Handling of paths through sandbox
I have a question regarding the proper handling of paths under Catalina, some of which go through the Container, some don't. More specifically, I get the Pictures folder using this line of code: dir_to_scan = [NSHomeDirectory() stringByAppendingPathComponent: @"Pictures/"] This gives me a path like /Users/zach/Library/Containers/com.apple.ScreenSaver.Engine.legacyScreenSaver/Data/Pictures Then, I start a Spotlight query to collect all images in that folder, like so: query_ = [[NSMetadataQuery alloc] init]; NSPredicate * predicate = [NSPredicate predicateWithFormat: @"(kMDItemContentTypeTree = 'public.image') && (kMDItemFSSize > %u) && (kMDItemPixelHeight > %u) && (kMDItemPixelWidth > %u)", excludekB_ * 1024, excludeSize_, excludeSize_ ]; [query_ setSearchScopes: [NSArray arrayWithObject: dir_to_scan]]; [query_ setPredicate: predicate]; [query_ startQuery]; (Yes, I have a few images in ~/Pictures) Then, I collect them, which also works fine. EXCEPT, apparently, Spotlight gives me paths starting with /Users/zach/Pictures ! (which does make some sense.) Problem is that I can't just do [ array_with_all_images addObject: [path substringFromIndex: ([dir_to_scan length] + 1)] ]; ! I could, of course, handle the case where dir_to_scan = ~/Pictures specially. But I am wondering whether or not I need to adopt a more general approach, i.e., could there be other cases where the dir_to_scan goes through the Container, whereas Spotlight gives me the direct paths? If so, what would be the correct approach? Thanks a lot in advance for all insights. Best regards, Gabriel ___ 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
Re: Sorting an array
Gabriel, > On Feb 11, 2020, at 10:36, Gabriel Zachmann via Cocoa-dev > wrote: > > I have some trivial questions regarding sorting a simple array of strings. > > I used to use this code: > >NSSortDescriptor *sd = [[NSSortDescriptor alloc] initWithKey: nil > ascending: YES];//TODO: raus >[imagefiles_ sortUsingDescriptors: @[sd] ]; Personally I find it awkward to use a sort descriptor with an explicitly nil key. The API allows it, but it just feels off to me. Are you restricted to using an SDK that doesn’t have the -sortedArrayUsingComparator:^NSComparissonResult block parameter? If so, the selector based API is still pretty clean. Before the block version of the API we often wrote our own sort methods and used them as the selectors sorting. Way back, we implemented Cocoa NaturalLanguage sorting for a long time like this, by wrapping C API in Cocoa. I mention this just to illustrate that you can do a lot this way. But ultimately the sorting API you choose should depend on the content of the array. Sandor > > where imagefiles_ is an NSMutableArray* . > > Now, in the developer doc > ( > https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/Collections/Articles/Arrays.html#//apple_ref/doc/uid/2132-SW5) > > I saw a different method. Following that, I was thinking of sorting my array > like this: > >NSArray * sorted_images = [imagefiles_ sortedArrayUsingSelector: > @selector(localizedStandardCompare:) ]; >imagefiles_ = [NSMutableArray arrayWithArray: sorted_images]; > > First of all, what are the advantages/disadvantages of either method? > > Second, I was wondering if I could write the second method like this: > >imagefiles_ = [imagefiles_ sortedArrayUsingSelector: > @selector(localizedStandardCompare:) ]; > > > Thanks a lot in advance. > > > > ___ > > 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/admin.szatmari.net%40gmail.com > > This email sent to admin.szatmari@gmail.com ___ 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
MFI Device Picker not displaying
I have a device with an MFI chip in it, I have my project set up with the
supported external accessory protocol strings, and I want to pull up the
MFI device picker just to prove to myself that my app can see my device.
This code runs, prints to the console, but I get a strange error.
if btManager!.state == .poweredOn {
print("Show MFI device picker.")
EAAccessoryManager.shared().showBluetoothAccessoryPicker(withNameFilter:
nil) { (error) in
if error != nil {
print(error!.localizedDescription)
switch error! {
case EABluetoothAccessoryPickerError.alreadyConnected:
print("already connected.")
break
default:
break
}
}
}
}
Console:
*Show MFI device picker.*
*A constraint factory method was passed a nil layout anchor. This is not
allowed, and may cause confusing exceptions. Break on BOOL
_NSLayoutConstraintToNilAnchor(void) to debug. This will be logged only
once. This may break in the future.*
I am assuming this is why I see no picker displayed. I am curious why I
might be seeing this. Not exactly sure how to fix it - I do a symbolic
breakpoint the break on _NSLayoutConstraintToNilAnchor (Module: UIKit).
Doesn't break on anything. Change the module to Foundation, it does break.
Seemingly on this line:
*class AppDelegate: UIResponder, UIApplicationDelegate {*
Any insight would be appreciated.
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Sorting an array
I have some trivial questions regarding sorting a simple array of strings. I used to use this code: NSSortDescriptor *sd = [[NSSortDescriptor alloc] initWithKey: nil ascending: YES];//TODO: raus [imagefiles_ sortUsingDescriptors: @[sd] ]; where imagefiles_ is an NSMutableArray* . Now, in the developer doc ( https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/Collections/Articles/Arrays.html#//apple_ref/doc/uid/2132-SW5) I saw a different method. Following that, I was thinking of sorting my array like this: NSArray * sorted_images = [imagefiles_ sortedArrayUsingSelector: @selector(localizedStandardCompare:) ]; imagefiles_ = [NSMutableArray arrayWithArray: sorted_images]; First of all, what are the advantages/disadvantages of either method? Second, I was wondering if I could write the second method like this: imagefiles_ = [imagefiles_ sortedArrayUsingSelector: @selector(localizedStandardCompare:) ]; Thanks a lot in advance. ___ 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
Xcode can't launch System Preferences any more
XCode used to be able to launch SystemPreferences under Mojave. In the active scheme used for building, under Run / Info / Executable, I have SystemPreferences.app selected. "Launch" is set to "automatically". Now, after Xcode has (successfully) built my screensaver, I get this error message: - - - Details Launch error Domain: IDELaunchErrorDomain Code: 9 Recovery Suggestion: There is a problem launching using posix_spawn (error code: 2). ‒ - - - Does anyone know what I could do? Thanks a lot in advance. Best regards, Gabriel. ___ 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
