I am trying to upload a video to Parse
If I just try to upload the video like so:
let videoData = NSData(contentsOfURL: url)
let videoFile = PFFile(name: "video.mov", data: videoData)
videoUploadObject["Video"] = videoFile
I will receive the error. I tried to remove this by running something like the following.
Main.sharedMain.userVideoOutputURL
returns:
file:///private/var/mobile/Containers/Data/Application/3B78A154-4340-432B-817A-2857EBA8064A/tmp/video.mov
Here is my full code:
let url = Main.sharedMain.userVideoOutputURL!
if let videoData = NSData(contentsOfURL: url) {
let videoFile = PFFile(name: "video.mov", data: videoData)
videoUploadObject["Video"] = videoFile
print("Video File \(videoFile)")
} else {
print("Else")
}
Else is always printed? What can I do to fix this? Thank you!
The URL looks fine (iOS doesn't use "/User/blah/blah/blah" for applicaion storage).
My first thought would be to check the data is writing correctly. NSData has a "writeToFile: options:" method that returns a bool. This will return false if writing has failed, and also throw an error which should give you some extra information.
let url = <YOUR_URL>
do {
// put your options in here
try data.writeToURL(url, options: NSDataWritingOptions.DataWritingAtomic)
} catch _ {
print(error.localizedDescription)
}
If writing has succeeded, then you'll want to try loading the data using "contentsWithUrl: options:". This also throws an error if it fails, and so using the "localisedDescription" property of the thrown error object you should be able to get to the bottom of why it isn't loading.
let url = <YOUR_URL>
var data: NSData? = nil
do {
// put your options in here
try data = NSData(contentsOfURL: url, options: NSDataReadingOptions.DataReadingUncached)
} catch _ {
print(error.localizedDescription)
}
Hope that helps :)
Related
I'm trying to bridge React and Swift code by passing a string for an image path, which I've verified appears correctly on the Native side, and having a bit of an issue. The image path comes from React as NSString, and my goal is to pass that as a String to a Native function that will ultimately send data back to React.
Here's a snippet of some code that handles part of this
classifyImage(value as String)
and some of the body of the classifiyImage is as follows:
#objc func classifyImage(_ image: String) {
let imageData = Data(base64Encoded: image, options: .ignoreUnknownCharacters)!
let uiImage = UIImage(data: imageData)
guard let orientation = CGImagePropertyOrientation(
rawValue: UInt32((uiImage?.imageOrientation.rawValue)!)) else {
return
}
...code
}
The exact error is at the line with the rawVale, reading
Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value
Here's more info if it may help...
Image data can come from the camera as such image NSMutableString "file:///var/mobile/Containers/Data/Application/54691469-2196-444E-9B45-C0D6F2CABEBC/Library/Caches/Camera/EEC3631C-3E96-44DA-B258-411363A2F10C.jpg" 0x00000002815a8420
or from the phone's gallery image String "ph://8F109DC0-CE95-4D0A-9D11-1B2E9CE6B8D3/L0/001"
Image from a file
First, we need to turn the string into a URL, then the URL into data like so:
let url = URL(string: image)
do {
let data = try Data(contentsOf: url)
} catch {
print(e)
}
Then we can use it to create the image.
do {
let data = try Data(contentsOf: url)
let image = UIImage(data: data)
guard let orientation = CGImagePropertyOrientation(
rawValue: UInt32(image.imageOrientation.rawValue)) else {
print("that didn't work")
return
}
} catch {
print(e)
}
I am using in my project safari content blocker extension. when i set the rule in blockerList.json file statically and run the project every thing is working fine. Now i want to set my rule dynamically using the technic as it describes in below.
Guys please help me out to set the rule dynamically at run time.
I try this but i am getting an error when
load from viewcontroller class
fileprivate func saveRuleFile() {
let ruleList = [["trigger":["url-filter": ".*"],"action":["type": "block"]]]
let encoder = JSONEncoder()
encoder.outputFormatting = .prettyPrinted
if let encoded = try? encoder.encode(ruleList) {
let sharedContainerURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.****.***")
print("sharedContainerURL = \(String(describing: sharedContainerURL))")
if let json = String(data: encoded, encoding: .utf8) {
print(json)
}
if let destinationURL = sharedContainerURL?.appendingPathComponent("Rules.json") {
do {
try encoded.write(to: destinationURL)
} catch {
print (error)
}
}
}
}
And write this in ContentBlockerRequestHandler class
func beginRequest(with context: NSExtensionContext) {
let sharedContainerURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.****.***")
let sourceURL = sharedContainerURL?.appendingPathComponent("Rules.json")
let ruleAttachment = NSItemProvider(contentsOf: sourceURL)
let item = NSExtensionItem()
item.attachments = ([ruleAttachment] as! [NSItemProvider])
context.completeRequest(returningItems: [item], completionHandler: nil)
}
i try to load using
SFContentBlockerManager.reloadContentBlocker(withIdentifier: "com.app.*****", completionHandler: {(error) in
if error != nil{
print("error: \(error.debugDescription)")
}
})
when try to execute 3rd number block at run time i'm getting an error. But i go to the file path and checked the json is absolutely fine, its a valid json there.
Error Domain=WKErrorDomain Code=2 "(null)" UserInfo={NSHelpAnchor=Rule list compilation failed: Failed to parse the JSON String.}
Try to use JSONSerialization. It work great for me :)
fileprivate func saveRuleFile() {
let ruleList = [["trigger":["url-filter": ".*"],"action":["type": "block"]]]
let jsonAsData = try! JSONSerialization.data(withJSONObject: ruleList)
let sharedContainerURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.****.***")
print("sharedContainerURL = \(String(describing: sharedContainerURL))")
if let destinationURL = sharedContainerURL?.appendingPathComponent("Rules.json") {
do {
try jsonAsData.write(to: destinationURL)
} catch {
print (error)
}
}
}
I'm using Swift 4 and trying to get images from my server. Using ipconfig in terminal, I know my localhost's ip is 10.43.229.215.
the following code is to retrieve the image data and turn it into UIImage:
func GetImage(url:String) {
let image = String(localIP + url).addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!
let url = URL(string: image)
print(image)
URLSession.shared.dataTask(with: url!, completionHandler: { (data, response, error) in
if error != nil {
print("Client error!")
return
}
guard let data = data else {
print("Error: did not receive data")
return
}
DispatchQueue.main.async {
self.LensImageView.image = UIImage(data: data)
}
}).resume()
}
What I don't understand is that, the image string did show the image I want if I copy/paste the string to my browser
(http://10.43.229.215:3000/lensPic/%E5%A4%AA%E5%A6%83%E7%B3%96%E6%9D%8F.png)
However, error appears at the line self.LensImageView.image = UIImage(data: data) saying Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value.
I'm really confused about:
How can data be nil if there is already a guard let method?
Why can the data be nil is I can show the image through my browser?
Any help is highly appreciated!
The problem lies in making a false assumption about what is nil. It has nothing to do with the image or the data. What’s nil is self.LensImageView, the outlet property.
I am working on an app where I am getting videos from a firebase link.
To be able to display and play the video I am using this extension:
func generateThumbnailForVideoAtURL(filePathLocal: NSString) -> UIImage? {
let vidURL = NSURL(fileURLWithPath:filePathLocal as String)
let asset = AVURLAsset(url: vidURL as URL)
let generator = AVAssetImageGenerator(asset: asset)
generator.appliesPreferredTrackTransform = true
let timestamp = CMTime(seconds: 1, preferredTimescale: 60)
do {
let imageRef = try generator.copyCGImage(at: timestamp, actualTime: nil)
return UIImage(cgImage: imageRef)
} catch let error as NSError {
print("Image generation failed with error \(error)")
return nil
}
}
And then using it like this in cellAtIndexPath:
if posts[indexPath.row].videoUrl != nil {
cell.videoView.generateThumbnailForVideoAtURL(filePathLocal: self.posts[indexPath.row].videoUrl as! NSString)
print("VIDEO IS: \(posts[indexPath.row].videoUrl)")
}
I am getting this error:
Image generation failed with error Error Domain=NSURLErrorDomain Code=-1102 "You do not have permission to access the requested resource." UserInfo={NSLocalizedDescription=You do not have permission to access the requested resource., NSUnderlyingError=0x1c4046ff0 {Error Domain=NSOSStatusErrorDomain Code=-12660 "(null)"}}
It seems like a UserInfo description, but I can not find anything in my plist to add for permission. It may just sound stupid for somebody else because this is how I feel now as I can't find a way to make it work. Please help!
You should use this
let vidURL = URL(string:filePathLocal as String)
instead of
let vidURL = NSURL(fileURLWithPath:filePathLocal as String)
thanks for any help upfront.
url session works perfect with connection, it prints the error as nil. but without it it prints the .localizedDescription just fine and shows me the right error, but then continues to do the do{ try } and crashes with this error in the try line:
Thread 6: Fatal error: Unexpectedly found nil while unwrapping an
Optional value
now I am not even sure if this has anything to do with the errorhandling. thanks for any help with understanding whats going on or just solving the problem!
func getData(completion: (() -> ())?) {
let urlString = URL(string: "https://api.coinmarketcap.com/v1/ticker/")
URLSession.shared.dataTask(with: urlString!, completionHandler: { (data, response , error) in
print("before entering do-try-catch", error?.localizedDescription)
do {
//create Dictionary
print("downloading content")
self.coinData = try JSONSerialization.jsonObject(with: data!) as! [[String:Any]]
//set connection status
self.connection = true
//update tableView
DispatchQueue.main.async {
completion?()
}
} catch {
print("catch", error.localizedDescription)
//set connection status
self.connection = false
//update tableView
DispatchQueue.main.async {
completion?()
}
}
}).resume()
}
Thread 6: Fatal error: Unexpectedly found nil while unwrapping an Optional value is a common problem for beginners.
You try to work with data that is not there.
So for example in your code you force to execute try JSONSerialization.jsonObject(with: data!)
When data is nil the code will crash.
The same at the beginning URLSession.shared.dataTask(with: urlString!, completionHandler: { (data, response, error) {}
When urlString is not a valid URL the code will be crash. (In this case the url seems to be valid).
For more information have a look here:
https://stackoverflow.com/a/24034551/4420355
Try the following snipped it should work
if let data = data {
self.coinData = try JSONSerialization.jsonObject(with: data) as? [[String:Any]]
//... work with coinData
}
Reason why it is crashing is because data is Optional and it should be nil or has some value. On line
self.coinData = try JSONSerialization.jsonObject(with: data!) as! [[String:Any]]
Compiler thinks:
Let's take a look and unwrap this Optianal variable. But it's nil, there is "nothing"! So what should I unwrap? Let's crash and throw Fatal Error message.
How to easily avoid this with Optional binding:
if let data = data {
....do something with data
} else {
...print error message
}
For more information take look at this brilliant answer.
https://stackoverflow.com/a/32170457/3046686