Convert UIImage into multipart form in swift 4 - ios

Question

I am trying to convert my image into multipart form data but it will fetch error.
var request = NSMutableURLRequest(URL: url!)
request.HTTPMethod = "POST"
var boundary = generateBoundaryString()
request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
var body = NSMutableData()
if self.img.image != nil {
var imageData = UIImagePNGRepresentation(self.img.image)
if imageData != nil {
body.appendString("--\(boundary)\r\n")
body.appendString("Content-Disposition: form-data; name=\"image\"; filename=\"image.png\"\r\n")
body.appendString("Content-Type: image/png\r\n\r\n")
body.appendData(imageData!)
body.appendString("\r\n")
}
}
body.appendString("--\(boundary)--\r\n")
request.setValue("\(body.length)", forHTTPHeaderField:"Content-Length")
request.HTTPBody = body
Please let me know how to convert UIImage into multipart form data and upload it to server in swift.

Answer 1

Try this code
func requestWith(endUrl: String, imageData: Data?, parameters: [String : Any], onCompletion: ((JSON?) -> Void)? = nil, onError: ((Error?) -> Void)? = nil){
let url = "http://google.com" /* your API url */
let headers: HTTPHeaders = [
/* "Authorization": "your_access_token", in case you need authorization header */
"Content-type": "multipart/form-data"
]
Alamofire.upload(multipartFormData: { (multipartFormData) in
for (key, value) in parameters {
multipartFormData.append("\(value)".data(using: String.Encoding.utf8)!, withName: key as String)
}
if let data = imageData{
multipartFormData.append(data, withName: "image", fileName: "image.png", mimeType: "image/png")
}
}, usingThreshold: UInt64.init(), to: url, method: .post, headers: headers) { (result) in
switch result{
case .success(let upload, _, _):
upload.responseJSON { response in
print("Succesfully uploaded")
if let err = response.error{
onError?(err)
return
}
onCompletion?(nil)
}
case .failure(let error):
print("Error in upload: \(error.localizedDescription)")
onError?(error)
}
}
}

Answer 2

Try below code :
func requestAPIWithImage( parameters: Parameters,url: URLConvertible,Completion: #escaping (_ success: Bool,_ response: AnyObject) -> Void) {
Alamofire.upload(multipartFormData: { (multipartFormData) in
print(parameters)
if Array(parameters.keys).contains(Keys.Image) {
multipartFormData.append(UIImageJPEGRepresentation((parameters)[Keys.Image] as! UIImage, 1)!, withName: "image", fileName: "swift_file.jpeg", mimeType: "image/jpeg")
}
for (key, value) in parameters {
print(key,value)
if key != Keys.Image{
multipartFormData.append((value as AnyObject).data(using: String.Encoding.utf8.rawValue)!, withName: key)
}
}
}, to:url)
{ (result) in
switch result {
case .success(let upload, _, _):
upload.uploadProgress(closure: { (progress) in
})
upload.responseJSON { response in
print(response.result)
self.getValidDict(result: response.result, completion: { (dict, error) in
var dict = dict
if dict == nil {
dict = NSDictionary.init(dictionary:
[kBaseMessageKey: error?.localizedDescription ?? "Some error has been occured",
kBaseStatusKey: false])
}
Completion(true,dict![Keys.result]! as AnyObject)
})
}
case .failure(let encodingError):
Completion(false,encodingError.localizedDescription as AnyObject)
break
}
}
}

Answer 3

Try this code, i hope it helps you.
let url = "RequestURL"
let img = UIImage(contentsOfFile: fullPath)
let data: NSData = UIImageJPEGRepresentation(img, 1)
sendFile(url,
fileName:"one.jpg",
data:data,
completionHandler: completionHandler:{
(result:Bool, isNoInternetConnection:Bool) -> Void in
// ...
NSLog("Complete: \(result)")
}
)
func sendFile(
urlPath:String,
fileName:String,
data:NSData,
completionHandler: (NSURLResponse!, NSData!, NSError!) -> Void){
var url: NSURL = NSURL(string: urlPath)!
var request1: NSMutableURLRequest = NSMutableURLRequest(URL: url)
request1.HTTPMethod = "POST"
let boundary = generateBoundary()
let fullData = photoDataToFormData(data,boundary:boundary,fileName:fileName)
request1.setValue("multipart/form-data; boundary=" + boundary,
forHTTPHeaderField: "Content-Type")
// REQUIRED!
request1.setValue(String(fullData.length), forHTTPHeaderField: "Content-Length")
request1.HTTPBody = fullData
request1.HTTPShouldHandleCookies = false
let queue:NSOperationQueue = NSOperationQueue()
NSURLConnection.sendAsynchronousRequest(
request1,
queue: queue,
completionHandler:completionHandler)
}
// this is a very verbose version of that function
// you can shorten it, but i left it as-is for clarity
// and as an example
func photoDataToFormData(data:NSData,boundary:String,fileName:String) -> NSData {
var fullData = NSMutableData()
// 1 - Boundary should start with --
let lineOne = "--" + boundary + "\r\n"
fullData.appendData(lineOne.dataUsingEncoding(
NSUTF8StringEncoding,
allowLossyConversion: false)!)
// 2
let lineTwo = "Content-Disposition: form-data; name=\"image\"; filename=\"" + fileName + "\"\r\n"
NSLog(lineTwo)
fullData.appendData(lineTwo.dataUsingEncoding(
NSUTF8StringEncoding,
allowLossyConversion: false)!)
// 3
let lineThree = "Content-Type: image/jpg\r\n\r\n"
fullData.appendData(lineThree.dataUsingEncoding(
NSUTF8StringEncoding,
allowLossyConversion: false)!)
// 4
fullData.appendData(data)
// 5
let lineFive = "\r\n"
fullData.appendData(lineFive.dataUsingEncoding(
NSUTF8StringEncoding,
allowLossyConversion: false)!)
// 6 - The end. Notice -- at the start and at the end
let lineSix = "--" + boundary + "--\r\n"
fullData.appendData(lineSix.dataUsingEncoding(
NSUTF8StringEncoding,
allowLossyConversion: false)!)
return fullData
}

Answer 4

I implemented Upload image using Multi-part in Swift 4:
Here is the code. Please have a look
func uploadImageToServerFromApp(nameOfApi : NSString, parameters : NSString, uploadedImage : UIImage, withCurrentTask :RequestType, andDelegate :AnyObject)->Void {
if self.isConnectedToNetwork(){
currentTask = withCurrentTask
let myRequestUrl = NSString(format: "%#%#%#",GlobalConstants.KBaseURL,nameOfApi,parameters)
let url = (myRequestUrl.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed))!
var request : NSMutableURLRequest = NSMutableURLRequest()
request = URLRequest(url: URL(string:url as String)!) as! NSMutableURLRequest
request.httpMethod = "POST"
//define the multipart request type
request.setValue("multipart/form-data", forHTTPHeaderField: "Content-Type")
let image_data = UIImagePNGRepresentation(uploadedImage)
if(image_data == nil){
return
}
let body = NSMutableData()
let fname = "image.png"
let mimetype = "image/png"
//define the data post parameter
body.append("--\(boundary)\r\n".data(using: String.Encoding.utf8)!)
body.append("Content-Disposition:form-data; name=\"image\"\r\n\r\n".data(using: String.Encoding.utf8)!)
body.append("hi\r\n".data(using: String.Encoding.utf8)!)
body.append("--\(boundary)\r\n".data(using: String.Encoding.utf8)!)
body.append("Content-Disposition:form-data; name=\"image\"; filename=\"\(fname)\"\r\n".data(using: String.Encoding.utf8)!)
body.append("Content-Type: \(mimetype)\r\n\r\n".data(using: String.Encoding.utf8)!)
body.append(image_data!)
body.append("\r\n".data(using: String.Encoding.utf8)!)
body.append("--\(boundary)--\r\n".data(using: String.Encoding.utf8)!)
request.httpBody = body as Data
let session = URLSession.shared
let task = session.dataTask(with: request as URLRequest) { (data, response, error) in
guard let data = data, error == nil else { // check for fundamental networking error
// print("error=\(String(describing: error))")
self.showAlertMessage(title: "App name", message: "Server not responding, please try later")
return
}
if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 { // check for http errors
// print("statusCode should be 200, but is \(httpStatus.statusCode)")
// print("response = \(String(describing: response))")
self.delegate?.internetConnectionFailedIssue()
}else{
do {
self.responseDictionary = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as! NSDictionary
// self.Responsedata = data as NSData
//self.responseDictionary = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as! [String: AnyObject] as NSDictionary;
self.delegate?.responseReceived()
} catch {
//print("error serializing JSON: \(error)")
}
}
}
task.resume()
}else{
// print("Internet Connection not Available!")
self.showAlertMessage(title: "App Name", message: "No Internet Connection..")
}}