making nsurlsession request with parameters

Question

Hy, I am new to swift and I am doing work on nsurlsession. Here is my code

  func webRequestToServer() {
            let request = NSURLRequest(URL: NSURL(string:"some url")!)
            let urlSession = NSURLSession.sharedSession()
            let task = urlSession.dataTaskWithRequest(request, completionHandler: {
                (data, response, error) -> Void in
                if let error = error {
                    print(error)
                    return }
                // Parse JSON data
                if let data = data {

                    let dataString = NSString(data: data, encoding: NSUTF8StringEncoding)
                    print(dataString)
                    NSOperationQueue.mainQueue().addOperationWithBlock({ () -> Void in

                    })
                } }) 
            task.resume()
        }

Thus from this code the data arrives from the websrvice but I want to do that first it takes two parameters from me and then show data? please help me. Sorry for my English. It's weak.

The answers below assume your web service is expecting JSON request. But that's not at all clear. There are many ways the request might need to be formatted (e.g. a `Content-Type` of `application/x-www-form-urlencoded` vs `application/json`). Can you tell us precisely in what format the server requires the request? — Rob, Feb 08 '16 at 06:27
If your server is expecting an `application/x-www-form-urlencoded` request (e.g. you see stuff in the web service code that references `$_POST`, for example), see http://stackoverflow.com/a/33574126/1271826 or http://stackoverflow.com/a/31031859/1271826. — Rob, Feb 08 '16 at 06:50

score 2 · Answer 1 · answered Feb 08 '16 at 06:00

2

You can have your parameters in dictionary and then convert it to NSData. Try out following

let request = NSURLRequest(URL: NSURL(string:"http://o16-labs.com/swapby/getcategoryinfo")!)
let params = ["key1" : "value1", "key2" : "value2"] as Dictionary<String, AnyObject>
request.HTTPBody = try? NSJSONSerialization.dataWithJSONObject(params, options:NSJSONWritingOptions.PrettyPrinted)

answered Feb 08 '16 at 06:00

Vishnu gondlekar

3,896
21
35

I think you meant `NSMutableURLRequest`. He may want to specify `HTTPMethod` as `POST`, too, depending upon the server requirements. And, obviously, your answer assumes that he needs JSON request, which is not at all clear. – Rob Feb 08 '16 at 06:53
It's showing error at that point request.HTTPBody = try? NSJSONSerialization.dataWithJSONObject(params, options:NSJSONWritingOptions.PrettyPrinted) the error is cannot assign value – Muhammad Murtaza Feb 08 '16 at 09:16
@MuhammadMurtaza - Yes, replace that `NSURLRequest` with `NSMutableURLRequest`. – Rob Feb 11 '16 at 17:46

Aruna kumari · Answer 2 · 2016-02-08T09:26:31.220

Frame the parameters to dictionary format and set that parameters to HTTPBody.Below code helps you...

let myUrl = NSURL(string: "http://o16-labs.com/swapby/getcategoryinfo");
    let request = NSMutableURLRequest(URL:myUrl!);
    request.HTTPMethod = "POST";
    // Compose a query string
    let postString = "firstName=James&lastName=Bond";

    request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding);

    let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
        data, response, error in

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

        // You can print out response object
        print("response = \(response)")

        // Print out response body
        let responseString = NSString(data: data!, encoding: NSUTF8StringEncoding)
        print("responseString = \(responseString)")

        //Let’s convert response sent from a server side script to a NSDictionary object:

        do {
            if let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary {
                print(jsonResult)
            }
        } catch let error as NSError {
            print(error.localizedDescription)
        }

    }

    task.resume()

This code give error at this point request.HTTPBody = NSJSONSerialization.dataWithJSONObject(params, options: nil, error: &err) The error is cannot assign property value — Muhammad Murtaza, Feb 08 '16 at 09:04
@MuhammadMurtaza u got output ? Add catch block for error handling in swift otherwise it shows error like Extra argument 'error' in call. Compilation error in Swift 2.0 — Aruna kumari, Feb 08 '16 at 09:27

score 0 · Answer 3 · answered Apr 12 '20 at 08:25

0

This is an update from @Vishnu gondlekar answer:

let params = ["key1": "value1", "key2": "value2"] as [String: Any]
var urlRequest = URLRequest(url: url)
urlRequest.httpBody = try? JSONSerialization.data(withJSONObject: params, options: .prettyPrinted)

answered Apr 12 '20 at 08:25

Matthew Usdin

1,264
1
19
20

making nsurlsession request with parameters

3 Answers3