The main example https://gist.github.com/C4Tutorials/5399635 crashes in the simulator with the following error: NSInvalidArgumentException', reason: '*** Can't add a nil AVCaptureInput'
It does work when launched on hardware. Is this a known issue or is there a workaround?
i think you can prevent the crash by checking the availability of the AVCaptureInput object before you add it to the AVCaptureSession.
to simplify it check the below code this will prevent the crash on the simulator but it won't help you test it.
try to find where ever you add a AVCaptureInput to a AVCaptureSession and put the following piece of code .
if ([session canAddInput: backCameraDeviceInput])
{
[session addInput: backCameraDeviceInput];
}
i wish this was helpful :)
Related
I have small app which runs on iOS and tvOS where I’m displaying a video in UIView.It does support iOS 12 and tvOS 12.
Now want to show PIP for tvOS hence trying to use AVPictureInPictureController gives error “Use of undeclared identifier 'AVPictureInPictureController”.
Even though deployment target set to tvOS 13. In Xcode, capabilities -> Background mode -> enabled “ Audio,Airplay and Picture In Picture”.
This basic code gives error.
#import <AVKit/AVKit.h>
if ([AVPictureInPictureController isPictureInPictureSupported]) {
// code
}
Any other settings missing or something else I need do ?
Thanks
Not supported in tvOS, as stated in Apple's documentation
SDKs
iOS 9.0+
macOS 10.15+
Mac Catalyst 13.0+
POSSIBLITY OF ISSUES DUE TO THE GAPS IN IMPLEMENTATION :
Experince with the AVPlayerViewController:
Initially make Sure that we set Playback audio category, Generally when we use a AVPlayerViewController to play video content. PIP mode will automatically get invoked if the developed application enters background , but only if satisfies the below mentioned condition,First one is the Player which we are using should be in Full Screen mode,the second is we should make sure that the Video Should be Playing in it and third one is PIP Should be supported by the device and last of all write delegate method to restore our player UI when the user returns from Picture in Picture mode.
Implmentation with _AVPictureInPictureController :
You can find an working example in the below thread.
How to display AVPictureInPictureController?
Drilling down the issue:
In order to confirm the undeclared error was not due to the gaps in implementation and it was due to environmnet in Xcode, Download the source and then add the Sources folder inside another folder in your workspace.Add the folder using "Add Files to ..." option and now verify inside xcode.
POSSIBLITY OF ISSUE DUE TO REFRESH IN THE XCODE
Try Fix By Approach 1
Include the class explicitly in header and/or body - instead of the *.pch file. Then this error might go away. Also deleting the derived data workes once in a while. Did you change the location in preferences recently by any chance. Some get this error when they use a ramdisk for derived data and then they go back to default. This is the most annoying case - since it causes this error to appear then in almost every file.
Try Fix By Approach 2
Sometime a simple solution might help delete one of the #import lines from the pch file and recompile which will fail as expected.Then put the deleted line back in, recompiled and it compiled normally with all the false errors gone.
POSSIBLITY OF ISSUE DUR TO XCODE ERROR CACHE, FOLLOW THE BELOW STEPS
Clean Build : Command-Option-Shift-K to clean out the build folder.
Reset Simulator : choose iOS Simulator > Reset Content and Settings
Restart Xcode
Delete your DerivedData folder in ~/Library/Developer/Xcode/DerivedData
Restart Computer
Delete the /var/folders in a very targetted way.
rm -rf "$(getconf DARWIN_USER_CACHE_DIR)/org.llvm.clang/ModuleCache"
Source:
How to Empty Caches and Clean All Targets Xcode 4 and later
Xcode "Use of undeclared identifier" errors, compiles/runs just fine
Use of undeclared identifier in Xcode 9.0
https://developer.apple.com/documentation/avkit/adopting_picture_in_picture_in_a_standard_player
To create a simple video player
First, you'll need to implement a basic video player in your project's ViewController.m file, like so:
#import "ViewController.h"
#import <AVKit/AVKit.h>
#interface ViewController ()
#property(nonatomic) AVPlayerViewController *playerViewController;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor blackColor];
// Create a stream video player.
AVPlayer *player = [[AVPlayer alloc] init];
self.playerViewController = [[AVPlayerViewController alloc] init];
self.playerViewController.player = player;
// Attach video player to view hierarchy.
[self addChildViewController:self.playerViewController];
self.playerViewController.view.frame = self.view.bounds;
[self.view addSubview:self.playerViewController.view];
[self.playerViewController didMoveToParentViewController:self];
}
#end
For further help go through https://help.apple.com/xcode/mac/8.0/#/dev51a648b07
I just upgraded to Xcode 7 and I can no long use the NSLog statement to show messages for debugging? NSLog(#"I am at the start of the loop"); This used to work and now I can't even write the statement in the code, it gives me a "expected parameter declarator"? What am I missing? I researched this and can't find anything saying it's changed. One day it worked and now it doesn't. I can find it in my older projects and it still works within those older projects. Any help would be appreciated.
Try Shift + + C (equivalent to View > Debug Area > Activate Console)
Credit to this original answer
I've tried the simple program for my exercise but if i compiled, it turned give a message "No Way to get the console handle" (Dev-Pascal).
Here's my code:
program square;
uses crt;
var
side,circumference,broad:real;
begin
write('Input the side value of the square: ');
readln(side);
circumference := 4 * side;
broad := side * side;
writeln('The circumference value of the square = ', circumference);
writeln('The abroad value of the square = ', broad);
writeln();
write('Press any key...');
readkey();
end.
thank you for helping and teaching me
i would appreciate
Dev-pascal comes with a 10+ years old Free Pascal version. I really have no idea. Try to run the example on the cmdline to see if dev-pascal is the cause or something else. Temporarily disable security software might also be something to try.
I suppose, you've created a Window Skeleton project.
It has it's description: A Windows skeleton application (no window).
In this case you'll get this error though you code compiles (I've got this error too with your code).
Try to create Console Application project which has it's own description: A standard console-based (MS-DOS) application (Your code has compiled and the program worked as well).
P.S. Can't say what exactly happens -- couldn't find any documentation about errors in Dev-Pas (1.9.2).
My assumption is that skeleton program doesn't imply console window for execution program while console application does.
just close the project and then re-open the pascal source file (.pas). And maybe put "readln;" just before "END.".
I am getting the following error when I try to start my Application...
[java.lang.IllegalStateException: java.lang.NullPointerException^M
at com.tivoli.pd.jutil.kb$1.run(kb$1.java:41)^M
at java.security.AccessController.doPrivileged(AccessController.java:229
)^M
at com.tivoli.pd.jutil.kb.c(kb.java:141)^M
at com.tivoli.pd.jutil.kb.(kb.java:56)^M
at com.tivoli.pd.jutil.PDContext.(PDContext.java:76)^M
at com.tivoli.pd.jazn.PDAuthorizationContext.(PDAuthorizationConte
xt.java:66)^M
I double checked the config file was accessible and I could read it. The code I am using looks as follows...
aC = new PDAuthorizationContext(cFile);
Is there a way to get more information on what is causing the NPE?
More information!!!
After debuging a bit, it appears the issue comes from this code (they use progaurd so it is a little hard to be 100% confident)...
Certificate[] arrayOfCertificate1 = ((KeyStore)???).getCertificateChain("DefaultID");
//Throws Null pointer (presumably because array is null)
Certificate localCertificate1 = arrayOfCertificate1[0];
EVEN MORE INFO
This appears to be some kind of dependency conflict (guess), because if I just create a sample App using PDAuthorizationContext it works fine.
Problem was related to the PD.jar version that I was using. Although I thought I was using one version I was using another. This was because on version was registered in my WebSphere library (under build path in eclipse). Once the proper library was introduced everything worked.
I have an Xcode project I've been working on for months. I've never had a problem with NSLog, but after upgrading to Xcode 4.2 nothing will log to the console. I even tried throwing this in viewDidLoad:
- (void)viewDidLoad
{
[super viewDidLoad];
NSLog(#"Can anyone hear me?");
And nothing. Is anyone else having this problem or know a solution?
Well, this is embarrassing. The console got deactivated somehow and I was actually watching the variables window. Pressing Shift + + C did the trick.
Many thanks to Robert King on this thread:
https://devforums.apple.com/message/565880#565880
This is a bug of Xcode8 + iOS10, we can solve it in this way:
When on simulator, add the Name OS_ACTIVITY_MODE and the Value
Variables disable and check it (Product -> Scheme -> Edit Scheme -> Run -> Arguments -> Environment).
When on device, only add OS_ACTIVITY_MODE and check it（don't add the Value). You'll see the NSLog in the Xcode8 Console.
In iOS10, a lot of system logging is displayed on the console. This can be disabled by including the OS_ACTIVITY_MODE = disabled in the Run Arguments for your scheme
However for iOS10, NSLog messages will not be displayed anymore.
In lower iOS versions the messages will still be displayed. So maybe for most test cases you can use a lower iOS version.
Otherwise you can include a Swift function which prints (print function) your text, this is working okay in iOS10.
Tested on iOS10.0.2 and iOS9.3
My issue is that I have Debugger Output selected. Once I changed it to either All output or target output NSLogs appear fine.
In case this confuses you its on the left of the Debug area.
I had the same issue.
The trick is to search and remove the below mentioned line from the project.
#define NSLog(...)
Search the entire project and remove it.
I just experienced this, so here's another thing to check.
-> Make sure you don't have anything typed in the Filter field below the Log Output. So, in my case I was searching for a term in the logger and forgot to delete the searched terms out of the Filter text field. DOH!
My issue was that I'd accidentally severed the referencing outlet from App Delegate (delegate - file's owner).