Make a Swift 5 function with completionHandler to print JSON data - php

I have the following Swift 5 function that calls a PHP script on my server:
func getJSONdata(fileName:String, completion: (_ json:JSON)->()) {
let session = URLSession(configuration: .ephemeral)
var jsonData = JSON()
let myUrl = URL(string: DATABASE_PATH + fileName + "/query.php?queryAll");
var request = URLRequest(url:myUrl!)
request.httpMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
DispatchQueue.main.async {
let task = session.dataTask(with: request) { (data, response, error) in
if error != nil {
print("\(error!.localizedDescription)")
return
}
// Get data
jsonData = try! JSON(data: data!)
// print(jsonData)
}
task.resume()
}// ./ dispatch aync
completion(jsonData)
}
This function is hosted in a separate Swift file, now in my ViewController.swift I call that function as follows:
getJSONdata(fileName: "Users") { (jsonData) in
print("\(jsonData)")
}
In this case, I'm getting an empty array in my Xcode console, instead, if I uncomment the // print(jsonData) that's inside my getJSONdata() function, the console prints out my JSON data.
Obviously I'm doing something wrong in my getJSONdata() function because I cannot retrieve data by calling in ViewController.swift.
Where is the error in my function?

Try the below code. Maybe it will help you.
func getJSONdata(fileName:String, completion:#escaping (_ json:JSON)->()) {
let session = URLSession(configuration: .ephemeral)
var jsonData = JSON()
let myUrl = URL(string: DATABASE_PATH + fileName + "/query.php?queryAll");
var request = URLRequest(url:myUrl!)
request.httpMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
DispatchQueue.main.async {
let task = session.dataTask(with: request) { (data, response, error) in
if error != nil {
print("\(error!.localizedDescription)")
completion(nil)
}
// Get data
jsonData = try! JSON(data: data!)
// print(jsonData)
completion(jsonData)
}
task.resume()
}
}

I've found a solution, I don't know why but if I add #escaping to my function declaration, it works fine.
I also had to move completion(jsonData) below jsonData = try! JSON(data: data!), as suggested by #chirag90.
So, here's the complete function:
func getJSONdata(fileName:String, completion: #escaping (_ json:JSON?) -> Void) {
let session = URLSession(configuration: .ephemeral)
var jsonData = JSON()
let myUrl = URL(string: DATABASE_PATH + fileName + "/query.php?queryAll");
var request = URLRequest(url:myUrl!)
request.httpMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
DispatchQueue.main.async {
let task = session.dataTask(with: request) { (data, response, error) in
if error != nil {
self.simpleAlert("\(error!.localizedDescription)")
return
}
// Get data
jsonData = try! JSON(data: data!)
completion(jsonData)
}
task.resume()
}// ./ dispatch aync
}

Related

HTTPS POST working successfully but variables come up null

The code I've posted here is a shortened versions with just the essentials to the issue. When put through rigorous error testing, it appears that there are no issues either within the request, within the server, or within the return code, except for the fact that the response from the server says "Function": null instead of "Function": "addUser" as it should. Is there something I'm doing wrong on either end? It just seems to not be recognizing the posted variables, but I've used this code numerous times in other apps and servers and it seems to be failing here for some reason I cannot see. Thank you for any assistance.
Here is my PHP on the server:
<?php
$t = $_POST["function"];
$do = array("Success"=>true, "Function"=> $t);
echo json_encode($do);
?>
Here is the swift I'm using to make the request:
let params = ["function": "addUser"] as [String: AnyObject]?
fetchData("https://pdt.pitchprogress.net/SamplePHP.php", token: nil, parameters: params, method: "POST", onCompletion: { (success, data) -> Void in
if success {
do {
let json = try JSON(data: data!)
if json["Success"].boolValue == true {
print("success!")
print(json.description)
print(json["Function"].stringValue)
}
}
}
})
func fetchData(_ feed:String,token:String? = nil,parameters:[String:AnyObject]? = nil,method:String? = nil, onCompletion:#escaping (_ success:Bool,_ data:Data?)->Void){
DispatchQueue.main.async {
if let unwrapped_url = URL(string: feed){
let request = NSMutableURLRequest(url: unwrapped_url)
if let parm = parameters {
if let data = (try? JSONSerialization.data(withJSONObject: parm, options:[])) as Data? {
request.httpBody = data
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
request.setValue("\(data.count)", forHTTPHeaderField: "Content-Length")
}
}
if let unwrapped_method = method {
request.httpMethod = unwrapped_method
}
let sessionConfiguration = URLSessionConfiguration.default
sessionConfiguration.timeoutIntervalForRequest = 15.0
let session = URLSession(configuration: sessionConfiguration)
let taskGetCategories = session.dataTask(with: request as URLRequest, completionHandler: { (responseData, response, error) -> Void in
let statusCode = (response as! HTTPURLResponse?)?.statusCode
//println("Status Code: \(statusCode), error: \(error)")
if error != nil || (statusCode != 200 && statusCode != 201 && statusCode != 202){
onCompletion(false, nil)
} else {
onCompletion(true, responseData)
}
})
taskGetCategories.resume()
}
}
}
This is because you are sending the params as JSON while your API requires params as form data.
This code sends the params as simple form post and this retrieved successful response.
var request = URLRequest(url: URL(string: "http://app123.freeiz.com/Apis/samples/api4.php")!)
request.httpMethod = "POST"
var postString = ""
postString.append("function=value") // replace 'function' with your paramname and 'value' with your value'
request.httpBody = postString.data(using: .utf8)
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data, error == nil else {
// check for fundamental networking error
print("error=\(String(describing: error))")
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))")
}
let responseString = String(data: data, encoding: .utf8)
if let unWrappedResponseString = responseString{
print(unWrappedResponseString)
}
}
task.resume()
I had once made a small wrapper for sending simple form data, If i find it I will update the answer with that. Till then you can try with this. Let me know how it goes..
Looks like your key is different use "function" instead of using "Function"

HTTP Post Parameters are passed json encoded to $_POST

I can't figure out how to properly send POST parameters.
My Swift 3:
let parameters = ["name": "thom", "password": "12345"] as Dictionary<String, String>
let url = URL(string: "https://mywebsite.com/test.php")!
let session = URLSession.shared
var request = URLRequest(url: url)
request.httpMethod = "POST"
do
{
request.httpBody = try JSONSerialization.data(withJSONObject: parameters)
}
catch let error
{
print(error.localizedDescription)
}
request.addValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
let task = session.dataTask(with: request as URLRequest, completionHandler:
{
data, response, error in
guard error == nil else
{
print(error as Any)
return
}
guard let data = data else
{
return
}
do
{
if let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String: Any]
{
print(json)
print(json["post"]!)
}
else
{
print("no json")
}
}
catch let error
{
print(error.localizedDescription)
}
})
task.resume()
My PHP:
<?php
header('Content-Type: application/json');
if(empty($_POST)) echo json_encode(array('post'=>'empty'));
else echo json_encode($_POST+array('post'=>'not_empty'));
exit;
If I set the content-type header (in Swift) to application/json I get:
["post": empty]
empty
If I set it to application/x-www-form-urlencoded I get:
["{\"name\":\"thom\",\"password\":\"12345\"}": , "post": not_empty]
not_empty
How do I send the dictionary to my server as $_POST key/value pairs, not as a json_encoded string?
You want to percent-escape the request into a x-www-form-urlencoded request, like so:
let parameters = ["name": "thom", "password": "12345"]
let url = URL(string: "https://mywebsite.com/test.php")!
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.updateHttpBody(with: parameters)
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
let task = session.dataTask(with: request) { data, response, error in
guard let data = data, error == nil else {
print("\(error)")
return
}
// handle response here
}
task.resume()
Where
extension URLRequest {
/// Populate the `httpBody` of `application/x-www-form-urlencoded` request.
///
/// - parameter parameters: A dictionary of keys and values to be added to the request
mutating func updateHttpBody(with parameters: [String : String]) {
let parameterArray = parameters.map { (key, value) -> String in
return "\(key.addingPercentEncodingForQueryValue()!)=\(value.addingPercentEncodingForQueryValue()!)"
}
httpBody = parameterArray.joined(separator: "&").data(using: .utf8)
}
}
extension String {
/// Percent escape value to be added to a HTTP request
///
/// This percent-escapes all characters besides the alphanumeric character set and "-", ".", "_", and "*".
/// This will also replace spaces with the "+" character as outlined in the application/x-www-form-urlencoded spec:
///
/// http://www.w3.org/TR/html5/forms.html#application/x-www-form-urlencoded-encoding-algorithm
///
/// - returns: Return percent escaped string.
func addingPercentEncodingForQueryValue() -> String? {
let generalDelimitersToEncode = ":#[]#?/"
let subDelimitersToEncode = "!$&'()*+,;="
var allowed = CharacterSet.urlQueryAllowed
allowed.remove(charactersIn: "\(generalDelimitersToEncode)\(subDelimitersToEncode)")
return addingPercentEncoding(withAllowedCharacters: allowed)?.replacingOccurrences(of: " ", with: "+")
}
}

Swift 3 Garbage at End

I am trying to receive info from my server but I keep getting the error telling me that there is Garbage at the end. It could be that the file being passed from the server has HTTP info as well but I do not know how to get rid of it. Here is my code:
class ViewController: UIViewController {
//URL to our web service
let URL_SAVE_TEAM = "http://<IP Address>/WebServerTest/api/createteam.php"
//TextFields declarations
#IBOutlet weak var textFieldName: UITextField!
#IBOutlet weak var textFieldMember: UITextField!
//Button action method
#IBAction func buttonSave(sender: UIButton) {
//created NSURL
let requestURL = NSURL(string: URL_SAVE_TEAM)
//creating NSMutableURLRequest
let request = NSMutableURLRequest(url: requestURL! as URL)
//setting the method to post
request.httpMethod = "POST"
//getting values from text fields
let teamName=textFieldName.text
let memberCount = textFieldMember.text
//creating the post parameter by concatenating the keys and values from text field
let postParameters = "name="+teamName!+"&member="+memberCount!;
//adding the parameters to request body
request.httpBody = postParameters.data(using: String.Encoding.utf8);
//creating a task to send the post request
let task = URLSession.shared.dataTask(with: request as URLRequest){
data, response, error in
if error != nil{
print("error is \(error)")
return;
}
//parsing the response
do {
//converting resonse to NSDictionary
let myJSON = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.allowFragments) as? NSDictionary
//parsing the json
if let parseJSON = myJSON {
//creating a string
var msg : String!
//getting the json response
msg = parseJSON["message"] as! String?
//printing the response
print(msg)
}
} catch {
print(error)
}
}
//executing the task
task.resume()
}
I am unable to see the issue.

Swift - Send an array as POST request parameter to PHP

I'm working on an app in Swift. I need to call PHP webservice from this app.
Below code for webservice:
// ViewController.swift
// SwiftPHPMySQL
//
// Created by Belal Khan on 12/08/16.
// Copyright © 2016 Belal Khan. All rights reserved.
//
import UIKit
class ViewController: UIViewController {
//URL to our web service
let URL_SAVE_TEAM = "http://192.168.1.103/MyWebService/api/createteam.php"
//TextFields declarations
#IBOutlet weak var textFieldName: UITextField!
#IBOutlet weak var textFieldMember: UITextField!
//Button action method
#IBAction func buttonSave(sender: UIButton) {
//created NSURL
let requestURL = NSURL(string: URL_SAVE_TEAM)
//creating NSMutableURLRequest
let request = NSMutableURLRequest(URL: requestURL!)
//setting the method to post
request.HTTPMethod = "POST"
//getting values from text fields
let teamName=textFieldName.text
let memberCount = textFieldMember.text
//creating the post parameter by concatenating the keys and values from text field
let postParameters = "name="+teamName!+"&member="+memberCount!;
//adding the parameters to request body
request.HTTPBody = postParameters.dataUsingEncoding(NSUTF8StringEncoding)
//creating a task to send the post request
let task = NSURLSession.sharedSession().dataTaskWithRequest(request){
data, response, error in
if error != nil{
print("error is \(error)")
return;
}
//parsing the response
do {
//converting resonse to NSDictionary
let myJSON = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableContainers) as? NSDictionary
//parsing the json
if let parseJSON = myJSON {
//creating a string
var msg : String!
//getting the json response
msg = parseJSON["message"] as! String?
//printing the response
print(msg)
}
} catch {
print(error)
}
}
//executing the task
task.resume()
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
I have this array:
let arr = ["aaa", "wassd", "wesdsd"]
Now I need to send this array as parameter like this:
let postParameters = "name="+teamName!+"&member="+memberCount!;
I've done this:
let postParameters = "name="+teamName!+"&member="+memberCount!+"&arr="+arr;
but getting this error:
Expression was too long to be solved in a reasonable time. consider breaking the expression into distinct sub expressions.
Any help would be appreciated.
A little confused about what you are trying to achieve exactly, but it seems you are trying to send an array in a form-url-encoded request which is not how it works.
You can either iterate through the array and individually assign them to values in the request parameter with something like so:
var postParameters = "name=\(teamName)&member=\(member)"
let arr = ["aaa", "wassd", "wesdsd"]
var index = 0
for param in arr{
postParameters += "&arr\(index)=\(item)"
index++
}
print(postParameters) //Results all array items as parameters seperately
Ofcourse, this is a kind of dirty solution and is assuming I'm correct about you trying to send an array incorrectly. If possible, I would send the request as an application/json request, as this would make things much easier and less dirty:
func sendRequest() {
let sessionConfig = NSURLSessionConfiguration.defaultSessionConfiguration()
/* Create session, and optionally set a NSURLSessionDelegate. */
let session = NSURLSession(configuration: sessionConfig, delegate: nil, delegateQueue: nil)
guard var URL = NSURL(string: "http://192.168.1.103/MyWebService/api/createteam.php") else {return}
let request = NSMutableURLRequest(URL: URL)
request.HTTPMethod = "POST"
// Headers
request.addValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")
// JSON Body
let bodyObject = [
"name": "\(teamName)",
"member": "\(member)",
"arr": [
"aaa",
"wassd",
"wesdsd"
]
]
request.HTTPBody = try! NSJSONSerialization.dataWithJSONObject(bodyObject, options: [])
/* Start a new Task */
let task = session.dataTaskWithRequest(request, completionHandler: { (data: NSData?, response: NSURLResponse?, error: NSError?) -> Void in
if (error == nil) {
// Success
let statusCode = (response as! NSHTTPURLResponse).statusCode
print("URL Session Task Succeeded: HTTP \(statusCode)")
}
else {
// Failure
print("URL Session Task Failed: %#", error!.localizedDescription);
}
})
task.resume()
session.finishTasksAndInvalidate()
}
Hopefully this can get you in the right direction. Good luck!

Empty array when making a HTTP Post Request to PHP from Swift App

Hi I am trying to connect my iOS app to my PHP API.
I am sending JSON POST to my PHP API but I am getting an empty array as Output.
My Swift Code
#IBAction func JSONButtonAction(sender: AnyObject) {
var configuration = NSURLSessionConfiguration.defaultSessionConfiguration()
var session = NSURLSession(configuration: configuration)
var usr = "dsdd"
var pwdCode = "dsds"
var image : UIImage = clickedPhotoView.image!
var imageData = UIImagePNGRepresentation(image)
let base64String = imageData.base64EncodedStringWithOptions(.allZeros)
let params:[String: AnyObject] = [
"email" : usr,
"image" : base64String ]
let url = NSURL(string:"http://localhost/app/")
let request = NSMutableURLRequest(URL: url!)
let boundaryConstant = "Boundary-7MA4YWxkTLLu0UIW"; // This should be auto-generated.
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.HTTPMethod = "POST"
var err: NSError?
request.HTTPBody = NSJSONSerialization.dataWithJSONObject(params, options: NSJSONWritingOptions.allZeros, error: &err)
let task = session.dataTaskWithRequest(request) {
data, response, error in
// println("response = \(response)")
let responseString = NSString(data: data, encoding: NSUTF8StringEncoding)
println("\(responseString)")
if let httpResponse = response as? NSHTTPURLResponse {
if httpResponse.statusCode != 200 {
println("response was not 200: \(response)")
return
}
}
if (error != nil) {
println("error submitting request: \(error)")
return
}
// handle the data of the successful response here
var result = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.allZeros, error: nil) as? NSDictionary
//println(result)
}
task.resume()
}
PHP Code
print_r($_POST);
Output is
array(
)
But when I use
$data = json_decode(file_get_contents('php://input'), true);
It works fine
I dont know why $_POST is not working.
If your intent is actually to send a string, then you should change the content-type:
request.setValue("text/plain", forHTTPHeaderField: "Content-Type")
Tested your exact code with this modification on my tests server:
Otherwise, check #kekub's comment.

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