I am trying to upload profile picture to the server. but I got an error while doing JSON Serialization.
the error message in the log are :
[Generic] Creating an image format with an unknown type is an error,
The data couldn’t be read because it isn’t in the correct format
The image appears in the user interface after selecting an image from photo library, but The image is not successfully uploaded to server, so maybe that is why I have error while doing JSON serialization. but i don't know why it is said not in the correct format since i try to upload an image in jpeg format.
here is the simplified code. what went wrong? :(
import UIKit
class HomepageVC: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {
@IBAction func editProfilePictureButtonDidPressed(_ sender: Any) {
// users choose photo from library or camera
let imagePickerController = UIImagePickerController()
imagePickerController.delegate = self
imagePickerController.allowsEditing = true
let actionSheet = UIAlertController(title: "Photo Source", message: "please choose your source", preferredStyle: .actionSheet)
// action camera
let actionCamera = UIAlertAction(title: "Camera", style: .default) { (action) in
if UIImagePickerController.isSourceTypeAvailable(.camera) {
imagePickerController.sourceType = .camera
self.present(imagePickerController, animated: true, completion: nil)
} else {
self.showAlert(alertTitle: "Opppss", alertMessage: "camera can't be used / not available", actionTitle: "OK")
print("camera can't be used / not available")
}
}
// action photo library
let actionPhotoLibrary = UIAlertAction(title: "Photo Library", style: .default) { (action) in
imagePickerController.sourceType = .photoLibrary
self.present(imagePickerController, animated: true, completion: nil)
}
//action cancel
let actionCancel = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
actionSheet.addAction(actionCamera)
actionSheet.addAction(actionPhotoLibrary)
actionSheet.addAction(actionCancel)
self.present(actionSheet, animated: true, completion: nil)
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
let image = info[UIImagePickerControllerOriginalImage] as! UIImage
avatarImage.image = image
picker.dismiss(animated: true, completion: nil)
// call func of uploading file to PHP server
uploadAvatar()
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
picker.dismiss(animated: true, completion: nil)
}
// custom HTTP request body to upload image file
func createBodyWithParams(_ parameters: [String: String]?, filePathKey: String?, imageDataKey: Data, boundary: String) -> Data {
var body = Data();
if parameters != nil {
for (key, value) in parameters! {
body.appendString("--\(boundary)\r\n")
body.appendString("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n")
body.appendString("\(value)\r\n")
}
}
// kita set agar image yang di upload kemudian berformat .jpg
let filename = "avatar.jpg"
let mimetype = "image/jpg"
body.appendString("--\(boundary)\r\n")
body.appendString("Content-Disposition: form-data; name=\"\(filePathKey!)\"; filename=\"\(filename)\"\r\n")
body.appendString("Content-Type: \(mimetype)\r\n\r\n")
body.append(imageDataKey)
body.appendString("\r\n")
body.appendString("--\(boundary)--\r\n")
return body as Data
}
// uploading image to server
func uploadAvatar() {
// get ID from Default variable
let id = userInfo!["id"] as! String
let url = URL(string: "http://localhost/Twitter/uploadAvatar.php")!
var request = URLRequest(url: url)
request.httpMethod = "POST"
let param = ["id" : id]
let boundary = "Boundary-\(UUID().uuidString)"
request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
let imageData = UIImageJPEGRepresentation(avatarImage.image!, 0.5)
// if not compressed, return ... do not continue to code
if imageData == nil {
return
}
// constructing http body
request.httpBody = createBodyWithParams(param, filePathKey: "file", imageDataKey: imageData!, boundary: boundary)
// launc session
URLSession.shared.dataTask(with: request) { data, response, error in
DispatchQueue.main.async(execute: {
if error == nil {
// if error is nil, then show message from server
do {
// json containes $returnArray from php
let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary
// declare new parseJSON to store json
guard let parsedJSON = json else {
print("Error while parsing")
return
}
// get id from $returnArray["id"] in PHP - parseJSON["id"]
let id = parsedJSON["id"]
// successfully uploaded
if id != nil {
// save user information from Server
UserDefaults.standard.set(parsedJSON, forKey: "parsedJSON")
// if no ID from server then show the message from server
} else {
// get main queue to communicate back to user
DispatchQueue.main.async(execute: {
let message = parsedJSON["message"] as! String
self.showAlert(alertTitle: "opppps", alertMessage: message, actionTitle: "OK")
})
}
// error doing JSON serialization
} catch {
// get main queue to communicate back to user
DispatchQueue.main.async(execute: {
let message = error.localizedDescription
self.showAlert(alertTitle: "Sorry", alertMessage: message, actionTitle: "OK")
})
}
// error ketika koneksi ke server
} else {
// get main queue to communicate back to user
DispatchQueue.main.async(execute: {
let message = error!.localizedDescription
self.showAlert(alertTitle: "oppps", alertMessage: message, actionTitle: "OK")
})
}
})
}.resume()
}
}
// extend data
extension Data {
mutating func appendString(_ string : String) {
let data = string.data(using: String.Encoding.utf8, allowLossyConversion: true)
append(data!)
}
}
答案 0 :(得分：1)
Your server data is print for more details. like server error or any other details.
URLSession.shared.dataTask(with: request) { data, response, error in
DispatchQueue.main.async(execute: {
// server data is convert in to string and print it
let strData = String.init(data: data!, encoding: String.Encoding.utf8)
print(strData )
})
}
The response returned by the server is not in the JSON format. You can use the tool to test the request first.
Print out of the error code is not a HTTP error code, because of the failure to resolve JSON