错误域= NSCocoaErrorDomain代码= 3840“无值。” UserInfo = {NSDebugDescription =无值。}用于图像上传

Question

当我尝试将图像上传到服务器时出现以下错误：

  

Error Domain = NSCocoaErrorDomain代码= 3840“无值。” UserInfo = {NSDebugDescription =无值。}

这是我一直在使用的代码：

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    @IBOutlet var imageView: UIImageView!
    @IBOutlet var myactivityindicator: UIActivityIndicatorView!

    @IBAction func uploadBtn(_ sender: UIButton) {
        myImageUploadRequest()
    }

    @IBAction func selectBtn(_ sender: UIButton) {
        let myimagepicker = UIImagePickerController()
        myimagepicker.delegate = self
        myimagepicker.sourceType = UIImagePickerControllerSourceType.photoLibrary
        self.present(myimagepicker, animated: true, completion: nil)
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        imageView.image = info[UIImagePickerControllerOriginalImage] as? UIImage
        self.dismiss(animated: true, completion: nil)
    }

    func myImageUploadRequest() {
        let myurl = NSURL(string: "http://10.1.1.11/akash/upload_image/image.php")
        let request = NSMutableURLRequest(url:myurl! as URL)
        request.httpMethod = "POST"

        let param = [
            "firstName"  : "Akash",
            "lastName"    : "Golui",
            "userId"    : "1"
        ]

        let myboundary = generateBoundaryString()
        request.setValue("multipart/form-data; boundary=\(myboundary)", forHTTPHeaderField: "Content-Type")
        let imageData = UIImageJPEGRepresentation(imageView.image!, 1)
        if(imageData==nil) { return; }

        request.httpBody = createBodyWithParameters(parameters: param, filePathKey: "file", imageDataKey: imageData! as NSData, boundary: myboundary) as Data

        myactivityindicator.startAnimating()
        let task = URLSession.shared.dataTask(with: request as URLRequest) {
            data, response, error in

            if error != nil {
                print("error=\(String(describing: error))")
                return
            }

            // You can print out response object
            print("******* response = \(String(describing: response))")

            // Print out reponse body
            let responseString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
            print("****** response data = \(responseString!)")

            do {
                let json = try JSONSerialization.jsonObject(with: data!, options: []) as? NSDictionary

                print(json!)

                DispatchQueue.main.async(execute: {
                    self.myactivityindicator.stopAnimating()
                    self.imageView.image = nil;
                });  
            } catch {
                print(error)
            }
        }

        task.resume()
    }

    func createBodyWithParameters(parameters: [String: String]?, filePathKey: String?, imageDataKey: NSData, boundary: String) -> NSData {
        let body = NSMutableData();

        if parameters != nil {
            for (key, value) in parameters! {
                body.append(NSString(format: "--\(boundary)\r\n" as NSString,boundary).data(using: String.Encoding.utf8.rawValue)!)
                body.append(NSString(format:"Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n" as NSString).data(using: String.Encoding.utf8.rawValue)!)
                body.append("\(value)\r\n".data(using: String.Encoding.utf8, allowLossyConversion: true)!)
            }
        }

        let filename = "user-profile.jpg"
        let mimetype = "image/jpg"

        body.append(NSString(format: "--\(boundary)\r\n" as NSString,boundary).data(using: String.Encoding.utf8.rawValue)!)
        body.append(NSString(format:"Content-Disposition: form-data; name=\"\(filePathKey!)\"; filename=\"\(filename)\"\r\n" as NSString).data(using: String.Encoding.utf8.rawValue)!)
        body.append(NSString(format: "Content-Type: \(mimetype)\r\n\r\n" as NSString).data(using: String.Encoding.utf8.rawValue)!)
        body.append(imageDataKey as Data)
        body.append(NSString(format: "\r\n").data(using: String.Encoding.utf8.rawValue)!)
        body.append(NSString(format: "--\(boundary)--\r\n" as NSString,boundary).data(using: String.Encoding.utf8.rawValue)!)
        return body
    }

    func generateBoundaryString() -> String {
        return "Boundary-\(NSUUID().uuidString)"
    }


}

extension NSMutableData {

    func appendString(string: String) {
        let data = string.data(using: String.Encoding.utf8, allowLossyConversion: true)
        append(data!)
    }
}