Alamofire file upload getting error “JSON text did not start with array or object and option to allow fragments not set”

问题

Below is my code referring this question answer

func createRequest(ResumeID: String, CandidateID: String, MediaName: String, FileExtension : String, MediaType : String) throws -> URLRequest {

    let parameters = NSDictionary(objects: [ResumeID, CandidateID, MediaName, FileExtension,MediaType], forKeys: ["ResumeID" as NSCopying, "CandidateID" as NSCopying, "MediaName" as NSCopying, "FileExtension" as NSCopying, "MediaType" as NSCopying])

    let boundary = generateBoundaryString()

    let url = URL(string: "http://192.168.1.29/ColorsKit_New_Svr/WTCSvr.svc/WTCService?Id=6&SPName=Usp_RTN_IU_CandidateSubmissionResume")!
    var request = URLRequest(url: url)
    request.httpMethod = "POST"
    request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")

    let path1 = Bundle.main.path(forResource: "dummy-pdf_2", ofType: "pdf")!
    request.httpBody = try createBody(with: parameters as? [String : String], filePathKey: "MediaContent", paths: [path1], boundary: boundary)

    return request
}

private func createBody(with parameters: [String: String]?, filePathKey: String, paths: [String], boundary: String) throws -> Data {
    var body = Data()

    if parameters != nil {
        for (key, value) in parameters! {
            body.append("--\(boundary)\r\n")
            body.append("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n")
            body.append("\(value)\r\n")
        }
    }

    for path in paths {
        let url = URL(fileURLWithPath: path)
        let filename = url.lastPathComponent
        let data = try Data(contentsOf: url)
        let mimetype = mimeType(for: path)

        body.append("--\(boundary)\r\n")
        body.append("Content-Disposition: form-data; name=\"\(filePathKey)\"; filename=\"\(filename)\"\r\n")
        body.append("Content-Type: \(mimetype)\r\n\r\n")
        body.append(data)
        body.append("\r\n")
    }

    body.append("--\(boundary)--\r\n")
    return body
}

func sendMultipartRequest() {
    let request: URLRequest

    do {
        request = try createRequest(ResumeID: "1", CandidateID: "1241124", MediaName: "dummy-pdf", FileExtension: "pdf", MediaType: "pdf")
    } catch {
        print(error)
        return
    }

    let task = URLSession.shared.dataTask(with: request) { data, response, error in
        guard error == nil else {
            // handle error here
            print(error!)
            return
        }

        // if response was JSON, then parse it

        do {                
            let responseDictionary = try JSONSerialization.jsonObject(with: data!)
            print("success == \(responseDictionary)")

            // note, if you want to update the UI, make sure to dispatch that to the main queue, e.g.:
            //
            // DispatchQueue.main.async {
            //     // update your UI and model objects here
            // }
        } catch {
            print(error)

            let responseString = String(data: data!, encoding: .utf8)
            print("responseString = \(String(describing: responseString))")
        }
    }
    task.resume()
}

The Response I'm getting is:

Error Domain=NSCocoaErrorDomain Code=3840 "JSON text did not start with array or object and option to allow fragments not set." UserInfo={NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.} responseString = Optional("No Records Found")

This is strange because Postman is giving correct response. Means there is something missing in the code only :(

回答1:

Use Alamofire

let upload_url = "your url"
let fieldName = "UploadedFile"
let mimeType = "plain/text"


Alamofire.upload(multipartFormData: { multipartFormData in

//you can add multiple file
        multipartFormData.append(fileData as Data, withName: fieldName, fileName: fileName, mimeType: mimeType)

    }, to: upload_url, method: .post, headers: ["Authorization": "auth_token"],

       encodingCompletion: { encodingResult in
        switch encodingResult {
        case .success(let upload, _, _):
            upload.response { [weak self] response in
                guard let _ = self else {
                    return
                }
                debugPrint(response)
            }
        case .failure(let encodingError):
            debugPrint("uploaderService error:\(encodingError)")
        }

    })

回答2:

Use JSONSerialization as below

if let responseDictionary = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? String {

...
}

来源：https://stackoverflow.com/questions/48220802/alamofire-file-upload-getting-error-json-text-did-not-start-with-array-or-objec