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I use UserDefaults to store a variety of user data / preferences. Recently, I have started getting somewhat frequent complaints from users that their settings have been reset.
There doesn't appear to be a rhyme or reason to the issue (some users have all of their data reset just once, while others are seeing that one of their settings resets very frequently).
I haven't been able to pinpoint what the root cause is, but I figure that it must have something to do with UserDefaults (either all of it or only certain keys) somehow getting erased.
As I figure out the root cause, I figure that a good solution in the meantime is to backup UserDefaults in some way (e.g. perhaps to iCloud?).
Is there a standard / best-practice way of doing this?
Hello,
I am having some trouble with an application accessing and running SQlite database queries.
The error I am getting is (5642) SQLITE_IOERR_SEEK when trying to sqlite_step_stement in the database. See https://www.sqlite.org/rescode.html#ioerr_seek
A bit of background, it is an application in Unreal Engine, and everything was working fine in Unreal Engine 4. The application uses a SQlite database on disk to store and fetch data. This database is saved to the documents folder. (I also tried other folders to see if that would make a difference)
But since switching to a new version of the engine, Unreal Engine 5, in a build I am getting errors when trying to read/write to the database. This only happens in a build .app file.
The only big difference I can find is that in the new engine when making a build the codesigning is already done in the engine. I don't see why those settings would break anything though. It also has an entitlements file, but I also edited it and made sure it has the same entitlements settings as my own scripts that are run afterwards.
I am overwriting the codesigning with our own CI/CD scripts afterwards. The .app file is codesigned, notarized and stapled by that script. Also I use an entitlements file to set certain values.
It doesn't seem to be a code related issue, as everything is working fine when running the application "in editor". But only when creating a final .app build. It doesn't matter if this build is in Debug or Shipping.
My first thought was to try more entitlements settings. But I tried the following and I am still getting the same errors:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>com.apple.security.cs.debugger</key>
<true/>
<key>com.apple.security.cs.disable-executable-page-protection</key>
<true/>
<key>com.apple.security.cs.disable-library-validation</key>
<true/>
<key>com.apple.security.automation.apple-events</key>
<true/>
<key>com.apple.security.app-sandbox</key>
<false/>
<key>com.apple.security.cs.allow-dyld-environment-variables</key>
<true/>
<key>com.apple.security.cs.allow-jit</key>
<true/>
<key>com.apple.security.cs.allow-unsigned-executable-memory</key>
<true/>
<key>com.apple.security.files.downloads.read-write</key>
<true/>
<key>com.apple.security.network.client</key>
<true/>
<key>com.apple.security.network.server</key>
<true/>
</dict>
</plist>
I also am thinking that it might be a different issue as the application is able to create a database file in the documents folder, just not able to do the read write inside the database.
These values are just set to try if any of these settings "fix" the issue, but thus far no luck.
As there is nothing I can find in Unreal Engine related forums, and I also do not have a lot of experience with all the options when making Mac builds. I was hoping someone on this forum could think of a reason why a .app file would have problems with reading and writing to a SQlite database.
I'm a bit confuse on the file permission between root and admin account.
I'm developing the background user agent process, and I created the agent plist file with the permission R&W for my admin account.
When I tried to load my agent process with launchd, it said the plist file permission is not right. Only after I change the plist file owner to root chown root my.plist, did everything work.
From the above situation, it seems that the root user cannot access files that are only authorized to the admin user.
Admin account also can't access files authorized only to root, unless you add sudo or enter the password when the request admin password box pops up. But by sudo or password, it just temporarily converts your account from admin to root account.
So am I right in my speculation?
I'm finding a way to hook vnode operations, following is a snippet of the code:
IOReturn
FltIOKitKAuthVnodeGate::RegisterVnodeScopeCallback(void)
{
//
// register our listener
//
this->VnodeListener = kauth_listen_scope( KAUTH_SCOPE_VNODE, // for the vnode scope
FltIOKitKAuthVnodeGate::VnodeAuthorizeCallback, // using this callback
this ); // give a cookie to callback
if( NULL == this->VnodeListener ){
DBG_PRINT_ERROR( ( "kauth_listen_scope failed\n" ) );
return kIOReturnInternalError;
}
return kIOReturnSuccess;
}
Here use kauth_listen_scope to get the newly created vnode object, then will hook on it.
But now kauth_listen_scope is deprecated, and there is no way to get the vnode by using EndpointSecurity.
So is there any other way to get the newly created vnode object?
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Hi all
In pursuit of adopting widgets in my application, I have transitioned from AppSupport to AppGroup as storage location for Core Data. I have done a migration process/flow that goes as follows and which have been tested multiple times although I have yet to publish the update:
Check if migration has taken place or not
1a. if yes continue to app
1b. If no continue flow
Begin migration process
2a. Backup original store in AppSupport
2b. Migrate store to AppGroup
2c. Migrate userdefaults to AppGroup
2d. Update userdefaults with true for both hasMigratedToAppGroup and hasMigratedUserDefaultsToAppGroup
Is there any tips or stuff to look for that hasn’t been taken in to account? How have you done it previously, and what would be recommended? Also, is there some specific tests to run/over many times get a baseline of how many is succeeding or failing?
Thanks in advance.
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Hello. I am trying to load my own Image Based Lighting file in a visionOS RealityView. I used the code you get when creating a new project from scratch and selecting the immersive space to full when creating the project. With the sample file Apple provides, it works. But when I put my image in PNG, HEIC or EXR format in the same location the example file was in, it doesn't load and the error states:
Failed to find resource with name "SkyboxUpscaled2" in bundle
In this image you can see the file "ImageBasedLight", which is the one that comes with the project and the file "SkyboxUpscaled2" which is my own in the .exr format.
if let immersiveContentEntity = try? await Entity(named: "Immersive", in: realityKitContentBundle) {
content.add(immersiveContentEntity)
do{
let resource = try await EnvironmentResource(named: "SkyboxUpscaled2")
let iblComponent = ImageBasedLightComponent(source: .single(resource), intensityExponent: 0.25)
immersiveContentEntity.components.set(iblComponent)
immersiveContentEntity.components.set(ImageBasedLightReceiverComponent(imageBasedLight: immersiveContentEntity))
}catch{
print(error.localizedDescription)
}
Does anyone have an idea why the file is not found? Thanks in advance!
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I am uploading pdf document through document picker from One drive. When I am uploading pdf document from OneDrive personal account it is working fine but when I am uploading from OneDrive business account it is getting failed.
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I have an app with IAP which uses a URLSession object to download files from a server. The download part of the code is:
let request = URLRequest(url: fromURL, cachePolicy: .reloadIgnoringLocalCacheData, timeoutInterval: timeoutInterval)
let (data, response) = try await downloadSession.data(for: request)
This code has been working without trouble for over a year with thousands of downloads.
Now I have a user with a new iPhone (iOS 17.3.1) which refuses to download, failing at the above code (judging by the high level logs).
My question is this: What sort of things should we be looking at in order to diagnose this issue?
So far we have done the following:
He has no general download issue (eg Safari works fine)
His network access is 'normal' and the problem persists when the network is changed (4G, wifi etc)
He runs a VPN (Nord) but the problem persists when this is off
He has no 3rd party AV software
His phone is not in lockdown mode
Any pointers would be appreciated! NB I have no physical access to his device (yet!)
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NSFileProvider Extension based on Xamarin.Mac constantly crashes starting on MacOS 14.4 Beta
Steps to Reproduce:
Create simple Xamarin.Mac solution and add FileProviderExtension project
Storage appears in Locations section in Finder
Expected Behavior:
Cloud storage shows folders content
Actual Behavior:
Cloud storage doesn't show folder content, just infinite running spinner
FileProviderExtension process constantly crashes. It occurs only in OSX starting from 14.4 beta. Please review crash report and help me understand whats wrong and how to fix it. Simple project written with Swift and Xcode works without any issues.
May be it’s related to issue described here https://forums.macrumors.com/threads/fileproviderctl-on-sonoma-14-4-here-we-f-ng-go-again.2418353.
Thanks in advance!
Environment-Info.log
CrashReport.txt
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Hi,
I have an issue that I don't understand, and I need help. I am using Pipe() in Swift, and I found that if I create more than 2560 (more or less) pipes, I cannot create more. The call fails with Too many open files, even though I closed all the files associated with the pipes.
This is a minimal code to reproduce the issue:
for i in 0...1278 {
NSLog("Testing: \(i)")
let stdin_pipe = Pipe()
let stdin_file = fdopen(stdin_pipe.fileHandleForReading.fileDescriptor, "r")
var stdout_pipe = Pipe()
var stdout_file = fdopen(stdout_pipe.fileHandleForWriting.fileDescriptor, "w")
if (stdout_file == nil) {
let errorString = String(cString: strerror(errno))
NSLog("Could not create an output stream. Error: \(errorString)")
}
do {
// I'm really trying to close everything (but it doesn't matter):
close(stdout_pipe.fileHandleForWriting.fileDescriptor)
close(stdin_pipe.fileHandleForReading.fileDescriptor)
try stdout_pipe.fileHandleForWriting.close()
try stdin_pipe.fileHandleForReading.close()
try stdout_pipe.fileHandleForReading.close()
try stdin_pipe.fileHandleForWriting.close()
}
catch {
NSLog("Error in closing pipes in MyExtension: \(error.localizedDescription)")
}
}
It will work for i going to 0 to 1277, and fail for i == 1278. The error (obtained from strerror(errno) is Too many files open, even though there are around 6 file descriptors opened (I checked).
What am I doing wrong?
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Hello.
I have the following question. I have a program that creates files with its own extension and reads them. When I select a file with my extension in the Files app, it automatically opens my app. But if a file with my extension is attached to an email, when I click on my file it shows me a screen with programs to open (actually it shows my program the second time I click on the file, if I click the first time, my program is not listed) . I have a question, is it possible to make the file with my extension attached to the letter immediately open in my program without additional screens or is it not allowed. If possible, then what did I miss, based on the fact that it opens immediately from the Files program.
Thank you.
P.S. File how it works below:
![]
[Image Edited by Moderator to Remove Personal Information]
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Questions about isExcludedFromBackup option and device migration
I posted a similar question a year ago, but I still haven't found a solution that I like, so I'm leaving this question.
If anyone knows how, please let me know.
In our app, we set the isExcludedFromBackup option to true so that files currently in the Documents path are not backed up to iCloud.
In the current situation, I am just curious as to whether the files of our app can be backed up in the two situations below. (with isExcludedFromBackup option set to true )
Migrate iPhone to new iPhone
Backup and restore the entire device to iTunes
If you set the isExcludedFromBackup option to true in the file, iCloud backup will not be possible, and the app's internal files will not be copied even in the two situations mentioned above.
Is there an option or method in the app's internal code to prevent automatic backup only to iCloud and allow files to be copied or synchronized in the above two situations?
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If I drag something into my SwiftUI Mac app the .dropDestination gets an array of URLs that I can do with what I want.
If I use .fileImporter to get an identical array of URLs I should wrap start/stop securityScopedResource() calls around each URL before I do anything with it.
Can anyone explain the logic behind that? Is there some reason I'm not seeing? It is especially annoying in that the requirement for security scoping also doesn't exist if I use an NSOpenPanel instead of .fileImporter.
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Hi, so following other tutorials on sharing app files to user I added and enabled LSSupportsOpeningDocumentsInPlace and UIFileSharingEnabled in info.plist. On app launch I create a sample file in the Documents Directory so that it shows up on the "On my iPhone" storage. I check this with the simulators for iOS17, iOS16 and it works fine, but for iOS15 it does not display the folder for my app. Does anyone have an idea on how to fix this?
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I am working on a similar application and would like to refer to the sample application referred in this video - "File Squeezer" and couldn't find anywhere. Could anybody please help me find this sample code?
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I'm currently trying to develop a transparent data encryption(TDE) system on MacOS 12.6.8. Our company has its own file encryption format. In order to facilitate safe and convenient file transfer between Windows and Mac platforms, we need to develop a TDE system on the Mac platform (on the Windows platform, we have developed such a system based on the Minifilter framework).
I tried to implement this system using a MacFuse based file system and the Endpoint Security system extension, but found that this did not allow complete control of files on the Mac system. For example, when you use Finder to copy an encrypted file, the decrypted data will be copied out. I'm guessing this might be due to Finder or some other system process cache.
By referring to the current product introductions of other companies, I learned that the current TDE systems on Mac systems are all based on kernel extension. But I noticed that Apple no longer encourages kernel extension development, and the Mac kernel has fewer and fewer APIs open to development.
So I would like to ask is it still feasible to develop a TDE system based on the kernel extension?
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Hey everyone,
I'm currently working on developing a kernel extension (kext) for the custom file system on macOS.
I opted for a kernel extension due to its potential for higher performance compared to using FileProvider. However, during development, I've noticed a significant performance bottleneck related to synchronous I/O operations within the VFS subsystem.
It appears that all I/O operations in the macOS kernel, such as vnop_read/vnop_write (sock_receive/sock_send), are executed synchronously. (https://forums.swift.org/t/task-safe-way-to-write-a-file-asynchronously/54639/7)
For example, the Linux kernel supports asynchronous I/O operations, which utilize struct file_operations.read_iter/write_iter.
This discrepancy in implementation leads to a considerable performance gap, with macOS performing approximately 8-15 times slower than Linux implementation.
Given this performance difference, I'm reaching out to seek advice and insights from the community.
Are there any known strategies or best practices for improving the performance of kernel extensions related to file systems on macOS?
Any guidance or suggestions on how to optimize the performance of file system operations on macOS kext would be greatly appreciated. Thank you in advance for your assistance!
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I'm developing a encrypte&decrypt filesystem on Mac. I use MacFuse to realize this filesystem and mount it under a folder.
By doing this I can hook the open file method when user are trying to open the encrypted file(such as A.rtf) under the mounted folder. Then I will decrypt A.rtf and generate a new decrypted file, let's call it as B.rtf. In the hooked open file method, I will return B.rtf file descriptor so that the user can open the decrypted file.
All works fine, until I opend the encrypted file once and copy it. It seems Mac system directly using the decrypted cache data when doing copy, so the decrypted content will be copied.
I tried add fcntl(fd, F_NOCACHE, 1); fcntl(fd, F_NODIRECT, 1) after int fd = open([p UTF8String], mode);, but it not work.
So is there a way to clearly tell the Mac system, do not cache my data when open files?
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Hi,
I've got swiftUI based application. It seems that on some occasions, when the app starts, I get the following popup window but I don't know which restricted items it attempts to access (passwords,network, etc..) . How can I tell what trigger this elevation message ?
Thanks !
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Hello,
in my Mac Catalyst app, I have detail view with sections modeled as DisclosureGroups. The label view has a button, that shall trigger a file import view when pushed. The label view is defined as follows:
swift
HStack {
Text(LocalizedStringKey("Documents")).font(.title)
Spacer()
Button {
showFileImporter = false
// fix broken picker sheet
DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
showFileImporter = true
}
} label: {
Image(systemName: "doc.badge.plus")
.padding(.horizontal, 10)
}
.disabled(!expanded)
.fileImporter(
isPresented: $showFileImporter,
allowedContentTypes: [.data],
allowsMultipleSelection: false) { result in
// add fileUrl.startAccessingSecurityScopedResource() before accessing file
NSLog("\(result)")
}
}
Unfortunately the file import view is not showing, when the button is pushed, although the state changes to true.
Does anybody have any hints?
BTW the repo is available at https://github.com/thbonk/repti/tree/ui-refactoring
The view in question is https://github.com/thbonk/repti/blob/ui-refactoring/Repti/Source/UI/Views/IndividualDetails/DocumentsSubview.swift
Thanks & Best regards
Thomas
popedriver.
