I would like to sent something to mysql using php, however, swift seem failed to sent the information I want, and I traced the problem using php, and finally I found that its the symbol "+" that causing the problem, how am I gonna solve the problem? Is it because swift utf8 encoding problem? Please advise.
func LoadDataToServer(){
let request = NSMutableURLRequest(url: NSURL(string:"<myphpaddress>.php")! as URL)
request.httpMethod = "POST"
let poststring = "tag=newcustomer&ap_contact_no=+12345678&cpm_no=123331231"
request.httpBody = poststring.data(using: String.Encoding.utf8)
let task = URLSession.shared.dataTask(with: request as URLRequest) { (data, response, error) in
if (error != nil)
{
print("error =\(error)")
return
}
else
{
print("response\(response)")
let responsestring = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
print(responsestring ?? "error")
}
}
task.resume()
}
+ is one of the reserved character in URLs, just like ?, &, =, and so on. It is an equivalent of a space character. If you need to have a plus sign in the URL, you need to encode it to %2B.
Read more: https://en.wikipedia.org/wiki/Percent-encoding
Related
After reading through numerous similar questions I still don't understand what the problem is here.
I'm trying to send a Base64 encoded image to a simple PHP script, here's my Swift code:
func sendImage(encodedImage: String) {
let url = URL(string: "http://www.site.whatever/image_upload.php")
var request = URLRequest(url: url!)
let postString = "encoded_image=\(encodedImage)"
let postData = postString.data(using: String.Encoding.utf8)
request.httpMethod = "POST"
request.httpBody = postData
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
let task = URLSession.shared.dataTask(with: request) {
data, response, error in
if error != nil {
// Handle error
return
}
let responseString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
print(responseString)
}
task.resume()
}
Simple PHP Script
$request_method = $_SERVER["REQUEST_METHOD"];
switch ($request_method) {
case 'POST':
if (isset($_POST["encoded_image"])) {
// POST parameter has been set successfully
$return = ["POSTSET?" => "Yes"];
echo json_encode($return);
}
// POST parameter was not set
$return = ["POSTSET" => "No"];
echo json_encode($return);
}
Problem:
With
let postString = "encoded_image=\(encodedImage)"
Where encodedImage is set with:
let encodedImage = image.pngData()!.base64EncodedString()
it returns {"POSTSET?","No"} // POST was not sent
With
let postString = "encoded_image=some_random_string"
it returns {"POSTSET?","Yes"} // POST sent successfully
I don't know why it works perfectly until I try and send a Base64.
Thoughts:
Is request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type") the correct content type?
Should I be setting a content length since the Base64 string is so long?
Should request.httpBody be encoded using something other than String.Encoding.utf8?
Should my PHP be expecting something different to what Swift is sending?
Any insight would be helpful, thanks.
The string length I was seeing for a Base64 encoded PNG was around 12 million characters on average. The server on which the PHP script is running isn't capable of accepting the request and would result in an error.
I sent a JPG to the API instead, the Base64 string is closer to 3 million when sent like this.
let image = info[UIImagePickerController.InfoKey.originalImage] as! UIImage
let imageData = image.jpegData(compressionQuality: 1)!
let encodedImage = imageData.base64EncodedString()
This successfully sends the image, allowing me to decode and save on the back end.
Hi all I am trying my hands on Swift and I am trying to post users registration data. I know how to do it firebase but my main project is in php mysql so I want to connect it with swift
#IBAction func signUp(_ sender: Any) {
//check textfield data
checkTextFields()
//create user
let url = NSURL(string: "http://localhost:8888/helo/register.php")
let request = NSMutableURLRequest(url: url! as URL)
request.httpMethod = "POST"
//apending body to url
let body = "Fullname=\(name.text!.lowercased())&userName=\(userName.text!.lowercased())&emailAddress=\(emailAddress.text!.lowercased())&password=\(password.text!.lowercased())"
request.httpBody = body.data(using: String.Encoding.utf8)
//lunching
URLSession.shared.dataTaskWithRequest(request as URLRequest, completionHandler: { (data:NSData?, response:URLResponse?, error:NSError?) in
if error == nil{
dispatch_async(dispatch_get_main_queue(),{
do {
let json = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableContainers) as?
NSDictionary
guard let parseJSON = json else{
print("Error while parsing")
return
}
let id = parseJSON["id"]
if id != nil {
print(parseJSON)
}
}catch{
print("Caugth an error: \(error)")
}
})
}else{
print("error: \(error)")
}
} )
}
I am getting an error on the line where I have commented as as lunching which say
Cannot convert value of type '(NSData?, URLResponse?, NSError?) -> ()' to expected argument type '(Data?, URLResponse?, Error?) -> Void'
I am new to Swift any help is welcome thank you all. I am using Xcode 9
After enough reading, I just realised I was doing a very tedious and using orthodox method when things have improved. I removed the whole code and did everything with Alamofire. Its really easy and straight forward. I will post the code below to help others who encounter similar problems later on.
//Constant that holds the URL for our web servicer
let URL_USER_REGISTER = "http://localhost:8888/members/register.php?"
Alamofire.request(URL_USER_REGISTER, method: .post, parameters: parameters).responseJSON{
response in
//printing response
print(response)
//getting json value from the server
if let result = response.result.value {
//converting it as NSDictionary
let jsonData = result as! NSDictionary
//displaying the message in label
self.lableMessage.text = jsonData.value(forKey: "message") as! String?
}
}
you have to first import Alamofire.
I have a very similar problem like in Why the http post request body always wrapped by Optional text in the Swift app
but I can´t apply the solution from this thread to my code, because I don´t have a request.setValue.
Does anyone know what I need to do to get rid of the Optional?
My Code:
#IBAction func LoginButtonTapped(sender: UIButton) {
let username = UsernameTextField.text
let password = PasswordTextField.text
if(username!.isEmpty || password!.isEmpty) {return; }
let request = NSMutableURLRequest (URL: NSURL(string: "http://myip/loginregister.php")!)
request.HTTPMethod = "POST"
let postString = "username=\(username)&password=\(password)"
request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding)
let task = NSURLSession.sharedSession().dataTaskWithRequest(request) { data, response, error in
guard error == nil && data != nil else {
// check for fundamental networking error
print("error=\(error)")
return
}
let data = postString.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!
do {
if let json = try NSJSONSerialization.JSONObjectWithData(data, options: []) as? NSDictionary {
let success = json["success"] as? Int // Okay, the `json` is here, let's get the value for 'success' out of it
print("Success: \(success)")
} else {
let jsonStr = NSString(data: data, encoding: NSUTF8StringEncoding) // No error thrown, but not NSDictionary
print("Error could not parse JSON: \(jsonStr)")
}
} catch let parseError {
print(parseError) // Log the error thrown by `JSONObjectWithData`
let jsonStr = NSString(data: data, encoding: NSUTF8StringEncoding)
print("Error could not parse JSON: '\(jsonStr)'")
}
}
task.resume()
You must unwrapping the value when get text from UITextField first, because the text property of UITextField allow nil
let username = UsernameTextField.text!
let password = PasswordTextField.text!
Explain more
When you unwrap the text of the UITextField, the username and password will be not nil variable.
The code compare empty should be:
if(username.isEmpty || password.isEmpty) {return }
If you does not unwrap, when you use this "\(username)", your are try to convert a nilable object to string, so the string result will be appended with a "Optional" text.
To Solve problem with Content-Type for request
Paste this line to your code. I don't believe that you do not have setValue method.
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField:"Content-Type")
The purpose of this code is to send data to a SQL database using PHP script.
But when I try to run it I get the following error:
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.}
This is my code:
// Send userdata to server side
let myURL = NSURL(string: "http://localhost/userRegister.php");
let request = NSMutableURLRequest(URL:myURL!);
request.HTTPMethod = "POST";
let postString = "email=\(userEmail)&password=\(userPassword)";
request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding);
// Create the task and execute it
let task = NSURLSession.sharedSession().dataTaskWithRequest(request){
data,response, error in
if error != nil{
print("error=\(error)")
return
}
var err: NSError?
do
{
let json = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableContainers) as? NSDictionary
if let parseJSON = json {
var resultValue = parseJSON["status"] as? String
print("result: \(resultValue)")
var isUserRegisterd:Bool = false;
if(resultValue=="Success")
{
isUserRegisterd = true
}
var messageToDisplay: String = (parseJSON["message"] as? String)!
if(!isUserRegisterd)
{
messageToDisplay = (parseJSON["message"] as? String)!
}
dispatch_async(dispatch_get_main_queue(), {
var myAlert = UIAlertController(title: "Alert", message: messageToDisplay, preferredStyle: UIAlertControllerStyle.Alert);
let okAction = UIAlertAction(title: "Oké", style: UIAlertActionStyle.Default){
action in
self.dismissViewControllerAnimated(true, completion: nil);
}
myAlert.addAction(okAction);
self.presentViewController(myAlert, animated: true, completion: nil);
});
}
}
catch
{
print(error)
}
}
task.resume()
What is the problem here?
That error generally means that the NSData doesn't contain valid JSON.
You should look at the response and the string representation of the data because if the server encountered a problem, it most likely would have returned a statusCode in the NSHTTPURLResponse (where 200 means that everything was OK, RFC 2616 describes what the other error codes mean) and the NSData likely contains HTML or text describing the nature of the problem:
do {
// your code where you `try` parsing the JSON response goes here
} catch {
print(error)
if data != nil {
let string = String(data: data!, encoding: NSUTF8StringEncoding)
print(string)
}
print(response)
}
When you look at the NSURLResponse and NSData objects, you will you be far more likely to diagnose the problem.
--
By the way, I might advise specifying the Content-Type of the request. Also, I'd suggest percent-escaping the email address and password. The latter is important because if the values contain special characters (e.g. + and & are notable problems), the data will not be processed correctly by the server.
let url = NSURL(string: "http://localhost/userRegister.php")
let request = NSMutableURLRequest(URL: url!)
request.HTTPMethod = "POST"
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
let encodedEmail = userEmail.stringByAddingPercentEncodingForFormUrlencoded()
let encodedPassword = userPassword.stringByAddingPercentEncodingForFormUrlencoded()
let postString = "email=\(encodedEmail)&password=\(encodedPassword)"
request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding)
Where
extension String {
/// Percent escape value to be added to a HTTP request
///
/// This percent-escapes all characters besize 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 stringByAddingPercentEncodingForFormUrlencoded() -> String? {
let allowedCharacters = NSCharacterSet(charactersInString: "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-._* ")
return stringByAddingPercentEncodingWithAllowedCharacters(allowedCharacters)?.stringByReplacingOccurrencesOfString(" ", withString: "+")
}
}
Alternatively, you can build the character set of allowed characters by starting with URLQueryAllowedCharacterSet, but you still have to remove a few characters as it will otherwise that allows certain characters pass unescaped (e.g. +). See https://stackoverflow.com/a/35912606/1271826.
Or you could use a framework like Alamofire which takes care of these details for you.
In my case, even the following code was causing this error by appending extra // slashes at the beginning of the output.
$arr = array("status" => 1, "msg" => "Your message goes here!");
echo json_encode($arr);
The reason was that these extra characters were being printed in other file that I included to this file.
I've a problem when I try to send a POST request to my API on my server, I've followed many many different tutorials but it still doesn't work.
I know than my problem is with the POST request but I can't solve it !
So this is my code in Swift and my API in php : (and yes I've replaced the xxxx by the real IDs in my code)
To sum up server receive the request and for example if I manually enter a pseudo it works, It's really the POST method who doesn't work.. The server doesn't receive the POST parameter
Swift code :
var request = NSMutableURLRequest(URL: NSURL(string: "http://localhost:8888/academy/test.php")!)
var session = NSURLSession.sharedSession()
request.HTTPMethod = "POST"
var params = ["pseudo":"test"] as Dictionary<String, String>
var err: NSError?
request.HTTPBody = NSJSONSerialization.dataWithJSONObject(params, options: nil, error: &err)
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
var task = session.dataTaskWithRequest(request, completionHandler: {data, response, error -> Void in
println("Response: \(response)")
var strData = NSString(data: data, encoding: NSUTF8StringEncoding)
println("Body: \(strData)")
var err: NSError?
var json = NSJSONSerialization.JSONObjectWithData(data, options: .MutableLeaves, error: &err) as? NSDictionary
// Did the JSONObjectWithData constructor return an error? If so, log the error to the console
if(err != nil) {
println(err!.localizedDescription)
let jsonStr = NSString(data: data, encoding: NSUTF8StringEncoding)
println("Error could not parse JSON: '\(jsonStr)'")
}
else {
// The JSONObjectWithData constructor didn't return an error. But, we should still
// check and make sure that json has a value using optional binding.
if let parseJSON = json {
// Okay, the parsedJSON is here, let's get the value for 'success' out of it
var success = parseJSON["success"] as? Int
println("Succes: \(success)")
}
else {
// Woa, okay the json object was nil, something went worng. Maybe the server isn't running?
let jsonStr = NSString(data: data, encoding: NSUTF8StringEncoding)
println("Error could not parse JSON: \(jsonStr)")
}
}
})
task.resume()*/
PHP Code :
$BDD_hote = 'xxxxx';
$BDD_bd = 'xxxxx';
$BDD_utilisateur = 'xxxxx';
$BDD_mot_passe = 'xxxxx';
try{
$bdd = new PDO('mysql:host='.$BDD_hote.';dbname='.$BDD_bd, $BDD_utilisateur, $BDD_mot_passe);
$bdd->exec("SET CHARACTER SET utf8");
$bdd->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);
}
catch(PDOException $e){
echo 'Erreur : '.$e->getMessage();
echo 'N° : '.$e->getCode();
}
$pseudo = addslashes($_POST["pseudo"]);
$req = $bdd->query("SELECT * from users WHERE pseudo='$pseudo'");
$resultArray = array();
$donnees = $req->fetch();
echo json_encode($donnees);
Thanks by advance :)
As others have pointed out, the encoding of the request is not quite right. Your server code is not expecting JSON request, but rather is using $_POST variables (which means that the request should have Content-Type of application/x-www-form-urlencoded). So that's what you should create. For example in Swift 3 and later:
var request = URLRequest(url: url)
request.httpMethod = "POST"
let parameters = ["somekey" : "valueforkey"]
request.setContent(with: parameters)
let task = session.dataTask(with: request) { data, response, error in
guard let data = data, error == nil else {
print(error ?? "Unknown error")
return
}
// your response parsing code here
}
task.resume()
The setContent method would take a dictionary of the form ["key1": "foo", "key2" : "bar"] and populate the httpBody with something that looks like key1=foo&key2=bar. If you do that, the server will be able to parse the $_POST from the request.
extension URLRequest {
/// Set body and header for x-www-form-urlencoded request
///
/// - Parameter parameters: Simple string dictionary of parameters to be encoded in body of request
mutating func setContent(with parameters: [String: String]) {
setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
let array = parameters.map { entry -> String in
let key = entry.key.addingPercentEncoding(withAllowedCharacters: .urlQueryValueAllowed)!
let value = entry.value.addingPercentEncoding(withAllowedCharacters: .urlQueryValueAllowed)!
return key + "=" + value
}
httpBody = array.joined(separator: "&").data(using: .utf8)!
}
}
Note, this also percent-encodes the values (and, just in case, the keys, too), which is critical. While others have advised using addingPercentEncoding with .urlQueryAllowed, sadly that will not do the job, as it will let certain reserved characters (notably +) pass unescaped. Most web services will interpret the + as a space, in conformance with the x-www-form-urlencoded spec. So, adapting an approach adopted by Alamofire, I define a character set which will encode values with the various delimiters:
extension CharacterSet {
/// Returns the character set for characters allowed in the individual parameters within a query URL component.
///
/// The query component of a URL is the component immediately following a question mark (?).
/// For example, in the URL `http://www.example.com/index.php?key1=value1#jumpLink`, the query
/// component is `key1=value1`. The individual parameters of that query would be the key `key1`
/// and its associated value `value1`.
///
/// According to RFC 3986, the set of unreserved characters includes
///
/// `ALPHA / DIGIT / "-" / "." / "_" / "~"`
///
/// In section 3.4 of the RFC, it further recommends adding `/` and `?` to the list of unescaped characters
/// for the sake of compatibility with some erroneous implementations, so this routine also allows those
/// to pass unescaped.
static var urlQueryValueAllowed: CharacterSet = {
let generalDelimitersToEncode = ":#[]#" // does not include "?" or "/" due to RFC 3986 - Section 3.4
let subDelimitersToEncode = "!$&'()*+,;="
var allowed = CharacterSet.urlQueryAllowed
allowed.remove(charactersIn: generalDelimitersToEncode + subDelimitersToEncode)
return allowed
}()
}
For Swift 2 rendition, see previous revision of this answer.
Try this:
let myURL = NSURL(string: "http://localhost:8888/academy/test.php")!
let request = NSMutableURLRequest(URL: myURL)
request.HTTPMethod = "POST"
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.setValue("application/json", forHTTPHeaderField: "Accept")
let bodyStr:String = "pseudo=test"
request.HTTPBody = bodyStr.dataUsingEncoding(NSUTF8StringEncoding)
let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
data, response, error in
// Your completion handler code here
}
task.resume()
You have to encode your data using UTF8 string encoding. If you need to set more than one field&value pairs for request body, you can change the body string, for example, "pseudo=test&language=swift". In fact, I usually create an extension for NSMutableURLRequest and add a method which takes a dictionary as parameter and sets the content of this map(dictionary) as HTTPBody using correct encoding. This may work for you:
extension NSMutableURLRequest {
func setBodyContent(contentMap: Dictionary<String, String>) {
var firstOneAdded = false
let contentKeys:Array<String> = Array(contentMap.keys)
for contentKey in contentKeys {
if(!firstOneAdded) {
contentBodyAsString += contentKey + "=" + contentMap[contentKey]!
firstOneAdded = true
}
else {
contentBodyAsString += "&" + contentKey + "=" + contentMap[contentKey]!
}
}
contentBodyAsString = contentBodyAsString.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)!
self.HTTPBody = contentBodyAsString.dataUsingEncoding(NSUTF8StringEncoding)
}
}
And you can use this as:
request.setBodyContent(params)
I hope this helps you!
the following php code is for receiving application/url+encode encoded post message. please refer https://en.wikipedia.org/wiki/Percent-encoding
$_POST["pseudo"]
and your swift code was sending a JSON encoded string data. They are incompatible.
If you don't want to change the php code, in Swift you should send url-encode format message, li:
// UPDATED with corrections from #Rob
var params = ["param1":"value1", "papam2": "value 2"]
var body = ""
for (key, value) in params {
body = body.stringByAppendingString(key)
body = body.stringByAppendingString("=")
body = body.stringByAppendingString(value.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)!)
body = body.stringByAppendingString("&")
}
body = body.substringToIndex(advance(body.startIndex, countElements(body)-1)) // remove the last "&"
request.HTTPBody = body.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)