Thanks a lot for the hints - I'll look into the different ideas.
Also thanks to Christos for his hints.
Best regards, Gabriel
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Please do
Is there a way to detect *from a shell script* whether any app on mac Mac is
running in fullscreen mode?
I don't really care which one it is, just whether any is in fullscreen.
(Such as a video player, or a video in Safari playing in full-screen mode, or a
PPT/Keynote presentation)
I want to
Good question.
Well, some users want to feed my app with image files of 100 MB, even up to 400
MB (mostly jpeg compressed).
Those images have resolutions of over 8k, sometimes over 10k.
The slideshow app needs to be able to zoom into those images with at least a
factor 2x scaling.
So I
I am developing a slideshow app; one of its features is that it keeps a history
of the last N images it has displayed. It keeps kind of a cache , where it
stores, among other things, the image returned by
CGImageSourceCreateThumbnailAtIndex(), because this is one of the expensive
operations.
> Make sure the text color is set to a named color such as Label Color instead
> of Black. If the text view doesn't contain text in the xib, it might not
> remember the color.
In the XIB, the NSTextView does not contain any text , just the usual
placeholder "lore ipsum".
> You might need to
I have an NSPanel that contains just an NSTextView.
The NSTextView is populated at init time using
[helpView_ readRTFDFromFile: path];
I think, the NSPanel itself is created by all the XIB magic.
Usually , the NSPanel is not visible; but when the user clicks a button,
I present it using
I have screensaver where the user can select a folder through the options sheet.
In that sheet, I open an NSOpenPanel, make a few settings, runModal,
let the user navigate and choose a folder, then get oPanel.URL.
(Complete code below.)
The curious thing is:
The oPanel returns only the folder
>>
>> I've just had a crash in
>> CGImageSourceCreateThumbnailAtIndex( new_image, 0, imageOpts );
>
> We went through this quite a while ago in private emails.
> CGImageSourceCreateThumbnailAtIndex is fine to use from any thread. Are you
> sure the image source even has an image at index 0?
I've just had a crash in
CGImageSourceCreateThumbnailAtIndex( new_image, 0, imageOpts );
The new_image and imageOpts were created/assigned just a few lines earlier in
the code.
(and in the debugger they appear to be non-null.)
So I was wondering if CGImageSourceCreateThumbnailAtIndex() is
>
>> I can confirm: this is indeed critical. Otherwise, the .saver does not
>> receive mouse events.
>>
>> Unfortunately, it seems that I still cannot get key events.
>
> If you are trying to get events from arrow or modifier keys, you have to use
> keyDown and not keyUp. But you may not be
>> Unfortunately, with -addGlobalMonitorForEventsMatchingMask: ,
>> the event is still passed on to the higher-up objects, so that makes the
>> screensaver engine terminate the screensaver immediately.
>
> Does this mean you’re unable to set up a global event tap/monitor? If you
> are able,
Thanks a lot for your response!
Unfortunately, with -addGlobalMonitorForEventsMatchingMask: ,
the event is still passed on to the higher-up objects, so that makes the
screensaver engine terminate the screensaver immediately.
Best regards, Gabriel
> On 26. May 2020, at 00:54, Sandor Szatmari
>> Also, I'm adding a NSTrackingArea (but not when the screensaver is in
>> preview mode). I think this is critical to making it work, but can't say
>> for certain.
>>
>> trackingArea = NSTrackingArea(rect:bounds,
>> options:[NSTrackingArea.Options.activeAlways,
>>
Thanks a lot for the response.
>
>[self.window setFrame:[[NSScreen mainScreen] frame] display:YES];
It sort of works, but the window still has borders.
I tried this:
[self.window toggleFullScreen: nil];
and it makes the app start in real full-screen (no window borders),
but then it
>>
>> https://iscreensaver.com
>>
>
> Looks like a macOS application with screen saver functionality. You could
> download it and try it
It's a "screensaver builder":
you add a bunch of picture, "build" a screensaver, and that sits then in your
System Preferences' Desktop & Screensavers
Here is a screensaver (actually, screensaver builder) that can capture mouse
events:
https://iscreensaver.com
Does anyone have an idea how they might be able to do it?
Best regards, Gabriel
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>>
>> No guarantees, but you could try moving your code into an AppDelegate method
>> that gets invoked earlier:
>>
>> - (void)applicationWillFinishLaunching:(NSNotification *)notification;
>>
Sorry for bothering again. The above solutions works very well.
Now I would like to make my app
When I do Product / Archive , Xcode builds my app and shows it in the Organizer.
However, it only creates /tmp/Debug, even though the Scheme has Build
Configuration = Release in the Archive section.
(I have set Derived Data to /tmp in the Locations tab in Xcode's preferences.)
I am confused:
Looks good! Thanks!
> On 23. May 2020, at 21:59, Carl Hoefs wrote:
>
> No guarantees, but you could try moving your code into an AppDelegate method
> that gets invoked earlier:
>
> - (void)applicationWillFinishLaunching:(NSNotification *)notification;
>
> -Carl
>
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Actually, after observing the new behavior for a while,
I have to say it's "almost" perfect.
The window still opens at some funny position with a smallish size (where is
that stored?),
but with no content, just grey inside, for a split second,
then it snaps to the autosaved position/size.
Seems to work like a charm! thanks a lot.
(For the record:
[self.window setDelegate: self];
has to be done before setFrameAutosaveName.)
Best regards, Gabriel
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I am trying to follow these instructions:
https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/WinPanel/Tasks/SavingWindowPosition.html
However, my app doesn't have a NSWindowController.
It just has a NSViewController and an AppDelegate.
So i thought I could stick the two
I have a few stupid questions regarding (potential) memory leaks,
so please bear with me.
First of all, my code is ARC managed.
I tried the Leaks tool of Instruments.
It tells me, if i understand correctly, that I have a leak at this line of my
code:
CFDictionaryRef fileProps =
> I’m not sure if you can create and manipulate a CALayer on a background
> thread, all UI code must be run on main thread.
Yes, that's what I was suspecting, too.
Interestingly, when I create a layer in the background, and add it to the main
layer *in the background thread* , it helps a
Thanks a lot for your response!
I have tried the CILanczosScaleTransform filter for downsizing. I have computed
the scale factor exactly such that the new image has an extent not larger than
the view.
(Below is my code)
But the performance was worse, at least with the software renderer.
With
>
> Ahh, there’s a jitter when moving.
Right. Sometimes it's a really lengthy stutter.
>
> Try creating an async dispatch to a background thread in a block.
I thought i'm doing that with this code:
-animateOneframe:
// essentially, this gets called when the next image is to be displayed
>
> Care to post a video on a Google drive so that we can see it?
Good idea - here is the video:
https://owncloud.informatik.uni-bremen.de/index.php/s/TTGG6bKCMFLqY4g
(encoded in H265/HEVC for saving file size)
I think, you can see clearly the stuttering. Sometimes it is more subtle,
>
> Actually, can’t you disable screen updating while you’re swapping images?
Would that mean that the animations are not .. animating during that time?
That would defeat the whole purpose of the exercise .
If I am mistaken: how would I disable screen updates?
Best regards, Gabriel
Thanks a million to everyone who has shared insights, hints, and advice on this.
I have restructured my code, so now I do the heavy lifting of loading images in
a serial dispatch queue.
However, there is still sometimes some stuttering visible in the animation of
the images.
Does anyone have an
> Time to learn some more about the frameworks you’re using then :)
:-)
> People have long dealt with this on iOS by doing tricks like first drawing
> that image to a 1x1 bitmap on a worker thread before sending it on to the UI.
Would that really make the background (worker) thread execute all
>
> Try Instruments. Apple have written a measuring tool for a reason :)
Thanks for the hint.
I've done that.
In the Heaviest Stack Trace, I am seeing functions like
CA::Transcation::commit()
CA::Render::copy_image(..)
CI::recursive_tile(..)
etc
None of these functions seems to get invoked
Again, thanks a lot for all the helpful hints.
Before restructuring my code, I did a few timings, using a set of test images
ranging in size from 30 through 300 MB.
I used mach_absolute_time() for this experiment.
And now, I am confused.
These are the execution times I have found for some of
> Also, if you’re already getting a CGImageRef using
> CGImageSourceCreateImageAtIndex, why not just set imgLayer.contents to the
> CGImageRef?
sorry, my previous response regarding this was incomplete. What I am doing is
this, in order to get the EXIF orientation right:
CIImage * image
>
> Also, if you’re already getting a CGImageRef using
> CGImageSourceCreateImageAtIndex, why not just set imgLayer.contents to the
> CGImageRef?
Good point . What I am doing right now is:
NSImage * nsimage = [self convertToNSImage: img withOrientation:
img_orientation];
CALayer *
> I would add, that for a long running process, open ended work, or task, I
> would favor a thread. But for short and finite items I would favor
> GCD/NSOperationQueue.
>
> Are you going to only load one image, the next image, in this concurrent
> loading scenario? Or, will you be loading
> Sure. Just be aware that if you're using NSImage, simply loading an NSImage
> does not rasterize it; the class tries to be 'lazy' about doing work. So your
> background task should explicitly render it, e.g. into an NSBitmapImageRep.
I am using CGImageSourceCreateImageAtIndex and related
> I second the use of GCD. Its also considerably simpler than NSThread,
> NSOperationQueue/NSOperation et al. This is the kind of operation that GCD
> was invented for.
Thanks a lot for your response(s).
To me a queue suggests that you have lots and lots of tasks arriving from the
Thanks for the question: MacOS.
>
> iOS or MacOS?
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I have kind of a slide-show app.
Sometimes, when it switches from one image to the next, there is a noticeable
lag when the file size of the next image is very big, say, 50 MB or more.
Sometimes, it seems that loading the image takes 1-2 seconds.
So, I was thinking, maybe it helps to load the
>>
>> Well, in my own -startAnimation, I do
>> [super startAnimation];
>
> Which could be doing all sorts of things that assume it's running in a known
> screensaver environment.
True.
Should I skip this statement in case -startAnimation has been compiled into the
app?
Best regards,
>>
>> That is what I'm doing.
>> I start my own timer, which periodically calls -animateOneFrame.
>> I call -stopAnimation when the app is hidden, etc.
>
> Are you calling the base class' startAnimation or stopAnimation methods? Or
> do you override those and never call the base class?
I
> The screensaver animation in macOS is reliant on the engine that drives it.
> Recently that changed from an older engine to what we can only guess is a
> newer one, but some of them still run in what is known as a newly named
> legacyScreenSaver, yet ScreenSaverEngine still fits in there
>
>> On May 2, 2020, at 09:15, Gabriel Zachmann via Cocoa-dev
>> wrote:
>>
>> ?I've got an app that makes heavy use of ScreenSaverView (i.e., creates an
>> instance of a subclass).
>
> ScreenSaverView is for screensavers, not apps. It?s behavior
Thanks a million to everybody for responding to my question!
I have been following Joao's instructions at
https://stackoverflow.com/questions/53101626/how-to-notarize-an-app-bundle-containing-helpers-embedded-in-it/56799591#56799591
I've got an app that makes heavy use of ScreenSaverView (i.e., creates an
instance of a subclass).
In that view, I am creating some CALayers with animations,
which I exchange occasionally in method
- (void) animateOneFrame
of my class.
All works fine, except when I minimize my app (using the
Thanks a lot for your response!
I apologize for bothering you (and anybody else),
because I have already found a solution myself.
For the record, I am currently using
[window_ toggleFullScreen: nil];
where window_ is what I get as parameter in
- (void) viewWillMoveToWindow:
In my app, I defined a key that switches the window/view to fullscreen mode and
back.
Essentially, I use these commands:
[self enterFullScreenMode: [NSScreen mainScreen] withOptions: nil];
and
[self exitFullScreenModeWithOptions: nil];
where self is an NSView.
This seems
Thanks a lot for your response.
> I’m not sure how you would script the export, but if you go to menu option
> Window -> Organizer, you can see your archives.
Yes, I can see them.
But when I do "Show in Finder", then "Show package contents", they contain
nothing
(except for an empty Products
I am trying to follow these instructions:
https://developer.apple.com/documentation/xcode/notarizing_macos_software_before_distribution/customizing_the_notarization_workflow?language=objc
However, I can't even achieve the first step ("Export a Package for
Notarization").
As per the
This whole notarization business is still pretty new to me.
I would like to notarize my screen saver, and distribute it outside the app
store.
I tried to read up on it as much as I can, but I still have a few very basic
questions.
As far as I understand, I need to enroll in the apple
>
> I believe that is why you are supposed to staple notarization tickets to your
> apps.
>
Then, why would it "phone home" in case there is an internet connection?
Best regards, Gabriel
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>
> It appears the problem is not with a local service, but that Apple
> actually ?phones home? when a program asks for display name.
>
> I don?t know if this is common knowledge, but with notarization, Apple
> now validates executables on your system before they are executed, and
> it does
>
> Yes, understood. Does the user have to ask for this process to begin, or
> does it start automatically?
The user starts the process by opening a directory.
Then, when the process hits an alias pointing to some other directory, the
process will ask the user again to open that directory.
>>> I would not do this. It is widely documented that AppKit API that produce
>>> UI elements, like NSOpenPanel, are _not_ thread safe.
>>
>> Right, and that is why I have to execute any UI code in the main thread,
>> or so I thought.
>> As far as I understand, the dispatch_get_main_queue is
Thanks a lot for your response.
> I would not do this. It is widely documented that AppKit API that produce UI
> elements, like NSOpenPanel, are _not_ thread safe.
Right, and that is why I have to execute any UI code in the main thread,
or so I thought.
As far as I understand, the
>
> Don't know if this helps you but you can look into dispatch_sync
> and dispatch_async.
>
Thanks a lot!
That made things very easy.
I am opening the panel now with this piece of code:
__block NSURL * user_permitted_url;
__block long int result;
Is it possible to open an NSOpenPanel in a secondary thread?
I create the thread like this:
directoryScanThread_ = [[NSThread alloc] initWithTarget: self
selector:
@selector(scanDirectory:)
PS:
So far, I am not even getting permissions within the same app invocation.
What I have tried is, when I hit an alias that is also a directory,
I open an NSOpenPanel with setDirectoryURL: resolved URL of the alias.
The user hits OK, then I try to set up an enumerator with that URL.
However,
I am doing a directory enumeration , collecting a list of files for accessing
them later.
When I encounter aliases / symlinks, I would like to follow them.
As far as I understand, in a sandboxed app, I need to ask the user to grant my
app access to the directories the aliases point to.
I guess
>
> Are you using startAccessingSecurityScopedResource?
Sorry I forgot to mention: yes, I do startAccessingSecurityScopedResource.
Also, reading the files works just fine.
(Haven't tried writing on them, because that is of no concern in my app. Just
reading or deleting.)
Best regards,
In my app, I collect lists of files that reside on an external disk.
When the user opens the directory of the files, I create a security-scoped
bookmark like this:
directoryBookmark_ = [dir bookmarkDataWithOptions:
NSURLBookmarkCreationWithSecurityScope
I have a ScreenSaverView instantiated and added to a window of a stand-alone
app like this:
In MasterViewController:
- (void) viewDidLoad
{
[super viewDidLoad];
saver_ = [[ArtSaverView alloc] initWithFrame: self.view.frame isPreview: NO
];
[self.view addSubview: saver_];
ill look and see the individual classes, but I need this in an older
> format to even open it. : /
>
>> On Mar 9, 2020, at 6:55 PM, Gabriel Zachmann via Cocoa-dev
>> mailto:cocoa-dev@lists.apple.com>> wrote:
>>
>> I must have done something very stupid, acci
I must have done something very stupid, accidentally,
but the method applicationDidFinishLaunching in my AppDelegate is not being
called any more.
I have googled and tried a few things, of course, to no avail.
Does anyone have an idea what it might be?
Maybe, some kind soul can take a quick
Is it possible to share one NIB/XIB between two different apps?
If yes, what would be the best approach for development: different Xcode
projects, or different targets within the same Xcode project?
More specifically, I have a screensaver with a relatively big configuration
options sheet.
All
When installing my screensaver (i.e., downloading and double-clicking),
some people get a funny warning saying "cannot check for malicious software".
In my Xcode project, I have "Automatically manage signing" switched on,
with the signing certificate "Development".
Is there anything I can do to
>
> So, you created a security scoped bookmark, then what did you do with it? You
> should store it in user defaults, then load it from user defaults the next
> time your code starts up, reconstitute it back into a security scoped URL,
> and then use *that* URL (literally that object, not a
>
> Given a URL to an image I currently do this to grab image properties
> (ignoring error handling to simplify the example code)
>
> let imgRef = CGImageSourceCreateWithURL(url as CFURL, nil)
> let imgProps = CGImageSourceCopyPropertiesAtIndex(imgRef, 0, nil) as
> NSDictionary?
> let
I am still having problems in my screensaver to access files that are stored on
an external disk.
The disk is just a simple hard disk connected to my Macbook via USB.
(It is an important use case, since a lot of people like to keep there huge
image collections on external hard disks.)
I can
>
> Why are you copying that app you are trying to build?
>
OK, I could just use the app bundle under /tmp/Release ,
I give you that.
But I would also like to *understand* why things are not working (if they are
not working).
So, why would copying the app bundle to some other place
(using in
lex Zavatone mailto:z...@mac.com>>
> wrote:
>
> Please send a screenshot of your copy files phase so we can clearly see what
> you are trying.
>
> Thanks.
>
> Sent from my iPhone
>
>> On Mar 2, 2020, at 7:12 PM, Gabriel Zachmann via Cocoa-dev
>> mai
I have a naked macOS app (created with Xcode's template "App").
I get this funny error message
Embedded binary is not signed with the same certificate as the parent app
but only, when I switch to Release *and* when I add a Copy Files phase
with Destination = Absolute Path
and Name =
Thanks a lot for your response!
>
> File/New Project - Select MacOS and then “App” (from the New Project Dialog).
That is what I did: see this screen recording:
https://owncloud.informatik.uni-bremen.de/index.php/s/br8rN3HGYfj9w3d
I am trying to replicate what this guy suggests:
https://medium.com/better-programming/how-to-make-a-custom-screensaver-for-mac-os-x-7e1650c13bd8
under section "Additional Debugging".
The idea is to create a standalone app that shares as much code with the
screensaver as possible.
I am
> For Retina displays, the backing store's size is always 2x the size in points
> that Cocoa reports. The backing store is then scaled to the display's
> physical resolution.
>
> Also, even if though the default point-size-to-display-physical-pixels used
> to be 2x, remember that other
>
> Does it make sense that starting at 1.7 gives you a 0.3 headroom for ‘zoom’
> without having to upsample?
You mean the accessibility zoom?
No, it does not make sense to me.
First of all, I can zoom in much more, so why waste 0.3 headroom although most
people don't even know about it?
>
> No, the default on recent Macs is scaled to slightly under 2x.
>
It is about ~ 1.7 .
this means that every view has to be scaled by this odd factor, before writing
its contents into the frame buffer.
I am curious as to why that doesn't cause any aliasing artefacts, or
anti-aliasing
>
> What have you set in System Preferences > Displays > Resolution. On a Retina
> MacBook most
I have set it to "Default for display" - shouldn't that set the resolution to
the native one?
Best regards, Gabriel
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When my screensaver gets invoked by the screensaver engine, it calls
- (id) initWithFrame: (NSRect) frameRect isPreview: (BOOL) preview
Funny thing is, when I print the frameRect to the log, I get 1680 x 1050.
But my laptop screen really has 2880 x 1800! (That's what I get from "About
this
> And that?s exactly why you need to store SSBs. You only have permission to an
> NSOpenPanel-gotten file for the current run or your program. Once it quits,
> that permission goes away.
I understand that - but how can I store SSBs, if the app (legacyScreenSaver)
does not have the
Sorry for bothering again.
I would like to obtain some clarification regarding the problems I am having
when my screensaver tries to load images that reside on an external disk.
I have read the dev docs on sandboxing (
>>
>> NSURL * url = [NSURL fileURLWithPath: [self absolutePathFor: filename_]
>> isDirectory: NO];
>> if ( url == NULL )
>> {
>> ... // never happened so far
>> }
>> CGImageSourceRef sourceRef = CGImageSourceCreateWithURL( (CFURLRef) url,
>> NULL );
>> if ( sourceRef == NULL )
One of my users (maybe, they others don't bother)
told me that occasionally, they get an error message that must originate from
this piece of code in my screensaver:
NSURL * url = [NSURL fileURLWithPath: [self absolutePathFor: filename_]
isDirectory: NO];
if ( url == NULL )
{
[From the mailing list, I have received an empty mail, so I am going to try
again]
In my screensaver , I am loading images using this piece of code:
CGImageSourceRef sourceRef = CGImageSourceCreateWithURL( (CFURLRef) url,
NULL );
if ( sourceRef == NULL )
{
...
}
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Help/Unsubscribe/Update your Subscription:
>>
>> The problem is that the path names can get very long.
>> And I am going to show them to the user.
>
> There is support in AppKit for displaying file paths to the user.
> Unfortunately it's been
I guess I should have said that I display the paths as a simple text overlay in
my
Thanks a lot for your response.
>> 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?
Exactly.
The problem is
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
Great! Thanks a lot.
(Just for the record: it's called sortUsingSelector: )
Best regards, Gabriel
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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
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,
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:
>>
>> So, is .../Containers/.../Data/Pictures linked to ~/Pictures automatically?
> No. The user has to give your app permission to see the contents of
> ~/Pictures.
>
>
Steve, thanks a lot for your response!
>>
>> In my screensaver, I try to search the Pictures directory in the user's home.
>> It is OK - for now - if my app cannot access any .photoslibrary, but I'd
>> like to pick up
>> any other images in ~/Pictures.
>>
>> I get the path using this line of
I have two questions regarding sandboxing.
1.
In my screensaver, I try to search the Pictures directory in the user's home.
It is OK - for now - if my app cannot access any .photoslibrary, but I'd like
to pick up
any other images in ~/Pictures.
I get the path using this line of code:
> Are you looking to detect changes that happen in between launches of your
> app? If so you’d have to save state and compare that saved state to the dir
> contents each time the app is launched.
Right. I was hoping there is an easy way to do this.
Something like a recursive check sum over
Thanks a lot!
Does it really watch subfolders, too?
Also, it seems to me like it works only while the program is running.
I am mostly interested in changes that happen "behind the program's back",
i.e., while it is *not* running.
Does your code really handle that?
Best regards, Gabriel
>
Is there a quick and easy way to check whether or not a directory tree has
changed?
I am only interested in file additions or deletions, somewhere beneath a
specific root directory,
e.g., ~/Data/some_directory.
However, I am interested in such changes between different invocations of my
> QT is probably the most viable cross-platform tool, but steep learning
> curve and mediocre GUI. Will it survive if Cocoa is deprecated?
Good question - I have no idea.
But I suggest you reach out to the support, or ask on Qt's forums about
roadmaps,
or meet them in person at an
>
> If someone can afford days/weeks to do watch WWDC sessions consistently
> every year it's great. That's not a luxury all of us can afford and it's
> ridiculous to think this should be a requirement.
>
But then, I am wondering, how does your company ensure your programmers
stay
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