Is tt okay to fix the nw_protocol_get_quic_image_block_invoke dlopen libquic failed problem?

Question

In the process of completing my work, I encountered the following problem:

Strange error nw_protocol_get_quic_image_block_invoke dlopen libquic failed

Below is the code I ran:

var readStream: Unmanaged<CFReadStream>?
  var writeStream: Unmanaged<CFWriteStream>?
  let host: CFString = NSString(string: hostIP)
  let port: UInt32 = UInt32(self.VNCport)
  
  self.password = password
  
  CFStreamCreatePairWithSocketToHost(kCFAllocatorDefault, host, port, &readStream, &writeStream)
 
  inputStream = readStream!.takeRetainedValue()
  outputStream = writeStream!.takeRetainedValue()
  
  if readStream == nil {
  print("Erro read")
  }
  
  if writeStream == nil {
  print("Erro write")
  }
  
  inputStream!.delegate = self
  outputStream!.delegate = self
  
  inputStream!.schedule(in: RunLoop.main, forMode: RunLoop.Mode.default)
  outputStream!.schedule(in: RunLoop.main, forMode: RunLoop.Mode.default)
  inputStream!.open()
  outputStream!.open()

What's causing it, and how can it be resolved in the “nw_protocol_get_quic_image_block_invoke dlopen libquic failed“ in the swift?

elveralowe · Answer

I ran across the same problem in a Widget Target, but it was solved when I added "public" to the variables. The program after fixing is:

struct LastCommitEntry: TimelineEntry {
public let date: Date
public let commit: Commit
}

Adam Thierry · Answer

The same error occurred in a different context in XCode 12.0.1. Although it may not be related, I suspect that the issue is with accessing the main thread's run loop. This is not a problem with your code, but a bug I encountered while trying to use some online introductory code. Here are some ways you can find a piece that has the same problem:

git clone git@github.com:BestKora/CS193P-Fall-2017-Demo-iOS12.git
cd "CS193P-Fall-2017-Demo-iOS12/Cassini L10"
xed . # this opens XCode (CLI tool stands for XCode editor)

However, this was possible because I rewrote the code. Perhaps you will find the solution to your problem in the code below.

In particular, you can use the following DispatchQueue.global instead

 private func fetchImage() {
 if let url = imageURL {
 spinner.startAnimating()
 DispatchQueue.global(qos: .userInitiated).async { [weak self] in
 let urlContents = try? Data(contentsOf: url)
 DispatchQueue.main.async {
 if let imageData = urlContents, url == self?.imageURL {
 self?.image = UIImage(data: imageData)
 }
 }
 }
 }
 }

This error is not happening anymore when I use URLSession.shared.dataTask

 private func fetchImage() {
 print("fetching image")
 if let url = imageURL {
 
 let task = URLSession.shared.dataTask(with: url) {(data, response, error) in
 guard let data = data else {
 return
 }
 // maybe try dispatch to main
 DispatchQueue.main.async {
 self.imageView.image = UIImage(data: data)
 }
 }
 task.resume()
 }
 }

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