Upload the image with JSON parameter in swift 3 - ios

Question

I am just trying to upload the image with json parameter in NSURLSession swift 3
url:"http:xxxxxxxx"
the JSON parameter : {"data":{"userId":9}}
Please help me to accomplish it
Here is the code:
func UploadRequest()
{
let username = "v"
let password = "v"
let loginData = String(format: "%#:%#", username, password).data(using: String.Encoding.utf8)!
let base64LoginData = loginData.base64EncodedString()
let url = NSURL(string: "http://xxxxxxxxxxxx")
let request = NSMutableURLRequest(url: url! as URL)
request.httpMethod = "POST"
request.setValue("Basic \(base64LoginData)", forHTTPHeaderField: "Authorization")
request.setValue("Application/json", forHTTPHeaderField: "Content-Type")
if (imageView.image == nil)
{
return
}
let image_data = UIImageJPEGRepresentation(imageView.image!, 1)
if(image_data == nil)
{
return
}
let boundary = generateBoundaryString()
request.httpBody = createBodyWithParameters(filePathKey: "file", imageDataKey: image_data! as NSData, boundary: boundary) as Data
request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
let session = URLSession.shared
let task = session.dataTask(with: request as URLRequest){
data, response, error in
self.loading.stopAnimating()
if data == nil{
print("data is nil")
}
else
{
print("data is\(data!)")
}
if error == nil{
print("error is nil")
}
else
{
print("error is \(error!)")
}
if response == nil{
print("response is nil")
}
else
{
print("response is \(response!)")
}
print("hitted")
guard let _:NSData = data as NSData?, let _:URLResponse = response, error == nil else {
print("error")
return
}
let dataString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
print(dataString!)
}
self.loading.stopAnimating()
task.resume()
}
func jsonToNSData(json: AnyObject) -> NSData?{
return try? JSONSerialization.data(withJSONObject: json, options: []) as NSData
}
func generateBoundaryString() -> String
{
return "Boundary-\(NSUUID().uuidString)"
}
//[String:[String: Int]]?
func createBodyWithParameters(filePathKey: String?, imageDataKey: NSData, boundary: String) -> NSData {
let body = NSMutableData();
let param:[String:Any] = ["data":["data":["userId":9]]]
do {
for i in param {
body.appendString(string:"--\(boundary)\r\n")
body.appendString(string:"Content-Disposition: form-data; name=\"\(i.key)\"\r\n\r\n")
body.appendString(string:"\(i.value)\r\n")
}
let jsonData = try JSONSerialization.data(withJSONObject: param, options: .prettyPrinted)
let decoded = try JSONSerialization.jsonObject(with: jsonData as Data, options: [])
let filename = "user-profile.jpg"
let mimetype = "image/jpg"
body.appendString(string:"--\(boundary)\r\n")
body.appendString(string: "Content-Disposition: form-data; name=\"\(decoded)\"\r\n\r\n")
body.appendString(string:"\(decoded)\r\n")
body.appendString(string: "--\(boundary)\r\n")
body.appendString(string: "Content-Disposition: form-data; name=\"\(filePathKey!)\"; filename=\"\(filename)\"\r\n")
body.appendString(string: "Content-Type: \(mimetype)\r\n\r\n")
body.append(imageDataKey as Data)
body.appendString(string: "\r\n")
body.append("--\(boundary)--\r\n".data(using: String.Encoding.utf8)!)
return body
}
extension NSMutableData {
func appendString(string: String) {
let data = string.data(using: String.Encoding.utf8, allowLossyConversion: true)
append(data!)
}
}
In the backend aim getting error as ["userId":9] cannot deserialize it

Answer 1

The error looks like it could be related to the way you are both serialising, deserialising then converting the dictionary to a string then back to data again. You can see this in the use of the decoded property instead of the jsonData when creating the request payload.
Instead of body.appendString(string:"\(decoded)\r\n")
Why not try:
body.append(jsonData)
body.appendString(string:"\r\n")