Hi my question is related to json object. i have this link "http://ip-api.com/json" and this link gives the details of your IP Address. i only need to print IP Address from this json file in swift 3. i am very new might be my question is basic but i need some help to sort out my project. so for i have done like below.
let requestURL: NSURL = NSURL(string: "http://ip-api.com/json")!
let urlRequest: NSMutableURLRequest = NSMutableURLRequest(url: requestURL as URL)
let session = URLSession.shared
let task = session.dataTask(with: urlRequest as URLRequest) {
(data, response, error) -> Void in
let httpResponse = response as! HTTPURLResponse
let statusCode = httpResponse.statusCode
if (statusCode == 200) {
print("Everyone is fine, file downloaded successfully.")
do{
let json = try JSONSerialization.jsonObject(with: data!, options:.allowFragments) as! [String:AnyObject]
if let stations = json["city"] as? [[String: AnyObject]] {
for station in stations {
if let name = station["regionName"] as? String {
self.names.append(name)
print("this is query\(name)")
}
else{
print ("no ip address is found")
}
}
}
}
catch {
print("Error with Json: \(error)")
}
}
}
task.resume()
many thanks in advance.
The IP address is the value for key query on the top level of the JSON
let json = try JSONSerialization.jsonObject(with: data!, options:.allowFragments) as! [String:Any]
if let query = json["query"] as? String {
print(query)
}
In Swift 3 the type of a JSON dictionary is [String:Any]
PS: You don't need a URL request for this task, pass the URL directly and use the native structs URL (and URLRequest)
let requestURL = URL(string: "http://ip-api.com/json")!
...
let task = session.dataTask(with: requestURL) {
Related
I am using URLSession to scrape JSON data from my website. My code was throwing various errors relating to casting types, so I added some print statements to my code and found that this function is for some reason accessing an older version of my site. I have since updated the website's data, and verified that the new data is displaying properly both through visiting the website myself and using Rested. However, the print statements in the code below yield old data. The code does not read data from the disk so I am not sure why this is happening.
I have removed the website's link from my code for privacy purposes, but otherwise the function can be found below.
func websiteToDisk() {
let config = URLSessionConfiguration.default
config.waitsForConnectivity = true
let defaultSession = URLSession(configuration: config)
let url = URL(string: someURL)
let task = defaultSession.dataTask(with: url!) { data, response, error in
do {
print("Getting information from website")
if let error = error {
print(error.localizedDescription)
} else if let data = data,
let response = response as? HTTPURLResponse,
response.statusCode == 200 {
//do {
let jsonDecoder = JSONDecoder()
print("about to dcode")
let decodedData = try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any]//try jsonDecoder.decode([String: [String]].self, from: data)
print(decodedData)
print("accessing dictionary")
print(decodedData!["busLoops"])
let toWrite = decodedData!["busLoops"] as! [String]
let documentDirectoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
let busLoopsURL = documentDirectoryURL.appendingPathComponent("busLoops").appendingPathExtension("json")
let jsonEncoder = JSONEncoder()
let jsonData = try jsonEncoder.encode(toWrite)
try jsonData.write(to: busLoopsURL)
//} catch { print(error)}
}
}
catch { print(error)}
}
task.resume()
}
Try ignore local cache data
guard let url = URL(string: "http://....") else{
return
}
let request = NSMutableURLRequest(url: url)
request.cachePolicy = .reloadIgnoringCacheData
let task = URLSession.shared.dataTask(with: request as URLRequest) { (data, resp, error) in
}
task.resume()
I don't find a way to parse a simple json object into a string object in swift. I have a network request which gives me this json response:
"\"asdf\""
When I try to parse this into a string in swift it looks like this:
"\"asdf\""
according this documentation from apple I should only need to do this:
Apple Swift documentation
let jsonValue = responseData as? String
But that does not work for me.
I need just asdf as string value.
Can anyone help me out?
Thanks in advance.
EDIT:
Here is my network request code:
let stringUrl = "https://test.fangkarte.de/v1.3/test"
let url = URL(string: stringUrl)!
let request = URLRequest(url: url)
let session = URLSession(configuration: URLSessionConfiguration.default)
let task = session.dataTask(with: request, completionHandler: {(data, response, error) -> Void in
if let data = data {
let json = String(data: data, encoding: String.Encoding.utf8)
let response = response as! HTTPURLResponse
if 200...299 ~= response.statusCode {
callback(true, response.statusCode, json!)
} else {
callback(false, response.statusCode, json!)
}
}
})
task.resume()
The value of the variable json is "\"testString\"" and not "testString"
You could try something like:
func parseJSON(_ data: Data) -> [String: Any]? {
do {
if let json = try JSONSerialization.jsonObject(with: data) as? [String: Any],
let body = json["data"] as? [String: Any] {
return body
}
} catch {
print("Error deserializing JSON: \n\(error)")
return nil
}
return nil
}
To use:
let data = <variable holding JSON>.data(using: .utf8)
let jsonResult = parseJSON(data)
You get a json string so you can try
let jsonstring = "\"asdf\""
let data = jsonstring.data(using: .utf8)
do {
if let str = try JSONSerialization.jsonObject(with: data!, options:.allowFragments) as? String {
print(str)
}
}
catch let caught as NSError
{
}
Have been researching on the parsing for quite a bit. With plethora of information avilable for JSON nothing seems to explain how to do in a sensible way to extract information with swift 3.
This is what got so far
func getBookDetails() {
let scriptUrl = "https://www.googleapis.com/books/v1/volumes?q=isbn:9781451648546" .
let myurl = URL(string:scriptUrl)
let request = NSMutableURLRequest(url: myurl!)
request.httpMethod = "GET"
let task = URLSession.shared.dataTask(with: myurl! ) { (data, response, error) in
if error != nil{
print("THIS ERROR",error!)
return
} else{
if let mydata = data{
do{
let myJson = try (JSONSerialization.jsonObject(with: mydata, options: JSONSerialization.ReadingOptions.mutableContainers)) as AnyObject
// print("this is the MY JSON",myJson) ---> prints out the json
if let dictonary = myJson["items"] as AnyObject? {
print("the DICTONARY",dictonary) // ----> OUTPUT
if let dictonaryAA = dictonary["accessInfo"] as AnyObject? {
print("the accessInfo",dictonaryAA)
}
}
} catch{
print("this is the in CATCH")
}
} //data
}
}
task.resume()
}
}
OUTPUT :
the DICTONARY (
{
accessInfo = {
accessViewStatus = SAMPLE;
country = US;
=============
RELEVANT DATA as in https://www.googleapis.com/books/v1/volumes?
q=isbn:9781451648546"
==========================
title = "Steve Jobs";
};
}
)
Just need to parse through the json data to get the name, author and title of the book with reference to isbn.
Know there should be a better way to do things that is easily understandable to someone new into the language
You can parse the api in two ways
Using URLSession:
let rawDataStr: NSString = "data={\"mobile\":\"9420....6\",\"password\":\"56147180..1\",\"page_no\":\"1\"}"
self.parsePostAPIWithParam(apiName: "get_posts", paramStr: rawDataStr){ ResDictionary in
// let statusVal = ResDictionary["status"] as? String
self.postsDict = (ResDictionary["posts"] as! NSArray!) as! [Any]
print("\n posts count:",self.postsDict.count)
}
func parsePostAPIWithParam(apiName:NSString, paramStr:NSString,callback: #escaping ((NSDictionary) -> ())) {
var convertedJsonDictResponse:NSDictionary!
let dataStr: NSString = paramStr
let postData = NSMutableData(data: dataStr.data(using: String.Encoding.utf8.rawValue)!)
let request = NSMutableURLRequest(url: NSURL(string: "http://13.12..205.248/get_posts/")! as URL,
cachePolicy: .useProtocolCachePolicy,
timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = nil
request.httpBody = postData as Data
let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
if (error != nil) {
print(error as Any)
} else {
let httpResponse = response as? HTTPURLResponse
print(httpResponse as Any)
do{
if let convertedJsonIntoDict = try JSONSerialization.jsonObject(with: data!, options: []) as? NSDictionary {
convertedJsonDictResponse = convertedJsonIntoDict.object(forKey: apiName) as? NSDictionary
// callback for response
callback(convertedJsonDictResponse)
}
} catch let error as NSError {
print(error)
}
}
Using Alamofire
func AlamofirePOSTRequest() {
let urlString = "http://13.12..205.../get_posts/"
let para = ["data": "{\"mobile\":\"9420....6\",\"password\":\"56147180..1\",\"page_no\":\"1\"}"]
Alamofire.request(urlString, method: .post, parameters: para , headers: nil).responseJSON {
response in
switch response.result {
case .success:
print("response: ",response)
let swiftyJsonVar = JSON(response.result.value!)
if let resData = swiftyJsonVar["posts"].arrayObject {
self.postsDict = resData as! [[String:AnyObject]]
}
print("\n \n alomafire swiftyJsonVar: ",swiftyJsonVar)
break
case .failure(let error):
print(error)
}
}
}
})
dataTask.resume()
}
First of all, all JSON types are value types in Swift 3 so the most unspecified type is Any, not AnyObject.
Second of all, there are only two collection types in the JSON type set, dictionary ([String:Any]) and array ([Any], but in most cases [[String:Any]]). It's never just Any nor AnyObject.
Third of all, the given JSON does not contain a key name.
For convenience let's use a type alias for a JSON dictionary:
typealias JSONDictionary = [String:Any]
The root object is a dictionary, in the dictionary there is an array of dictionaries for key items. And pass no options, .mutableContainers is nonsense in Swift.
guard let myJson = try JSONSerialization.jsonObject(with: mydata) as? JSONDictionary,
let items = myJson["items"] as? [JSONDictionary] else { return }
Iterate through the array and extract the values for title and authors which is an array by the way. Both values are in another dictionary for key volumeInfo.
for item in items {
if let volumeInfo = item["volumeInfo"] as? JSONDictionary {
let title = volumeInfo["title"] as? String
let authors = volumeInfo["authors"] as? [String]
print(title ?? "no title", authors ?? "no authors")
The ISBN information is in an array for key industryIdentifiers
if let industryIdentifiers = volumeInfo["industryIdentifiers"] as? [JSONDictionary] {
for identifier in industryIdentifiers {
let type = identifier["type"] as! String
let isbn = identifier["identifier"] as! String
print(type, isbn)
}
}
}
}
You are doing wrong in this line
if let dictonaryAA = dictonary["accessInfo"] as AnyObject?
because dictonary here is an array not dictionary. It is array of dictionaries. So as to get first object from that array first use dictonary[0], then use accessInfo key from this.
I am attaching the code for your do block
do{
let myJson = try (JSONSerialization.jsonObject(with: mydata, options: JSONSerialization.ReadingOptions.mutableContainers)) as AnyObject
// print("this is the MY JSON",myJson) ---> prints out the json
if let array = myJson["items"] as AnyObject? {
print("the array",array) // ----> OUTPUT
let dict = array.object(at: 0) as AnyObject//Master Json
let accessInf = dict.object(forKey: "accessInfo") //Your access info json
print("the accessInfo",accessInf)
}
}
Hope this helps you.
I have JSON method which fetch data. Everything works on emulator even if I load app from Xcode to iPhone, but when I upload app for testing to Testflight it doesn't work (data doesn't appear) here is my fetch method:
private func fetchSchools(){
let requestURL: NSURL = NSURL(string: "http://somelink.com/json.txt")!
let urlRequest: NSMutableURLRequest = NSMutableURLRequest(url: requestURL as URL)
let session = URLSession.shared
let task = session.dataTask(with: urlRequest as URLRequest) {
(data, response, error) -> Void in
let httpResponse = response as! HTTPURLResponse
let statusCode = httpResponse.statusCode
if (statusCode == 200) {
print("Everything is fine, file downloaded successfully.")
do{
let json = try JSONSerialization.jsonObject(with: data!, options:.allowFragments) as! [String: AnyObject]
if let JSONSchools = json["skoly"] as? [[String: AnyObject]]{
for school in JSONSchools {
if let name = school["nazev"] as? String {
if let city = school["mesto"] as? String {
if let id = school["id"] as? String {
self.schools.append(School.init(name: name, city: city, id: id))
}
}
}
}
self.fetchFinished = true
}
} catch {
print("Error with Json: \(error)")
}
}
}
task.resume()
}
Thanks for help
I solved the problem. It wasn't in JSON method. I had to:
Select project in the Project Navigator pane
Select project's settings under the "PROJECT" tree
Click "Build Settings" tab
Search for "Optimization Level"
Set release for None [-O0]
func callAddWithPOST(Name mname:String, PhoneNo mphone:String, Email memail:String, Comment mcomments:String)
{
var names = [String]()
let login = ["countryId":"1"]
print("Your Result is : = \(login)")
let url = NSURL(string: "http://photokeeper.mgtcloud.co.uk/commonwebservice.asmx/getStateList")!
let session = NSURLSession.sharedSession()
let request = NSMutableURLRequest(URL: url)
do
{
let auth = try NSJSONSerialization.dataWithJSONObject(login, options: .PrettyPrinted)
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
request.HTTPMethod = "POST"
request.HTTPBody = auth
let task = session.dataTaskWithRequest(request, completionHandler: { (data, response, error) -> Void in
let responseString = String(data:data!, encoding: NSUTF8StringEncoding)
let validresponseString = "\(responseString!)"
print(validresponseString)
let badJsonString = "This really isn't valid JSON at all"
let jsonData = validresponseString.dataUsingEncoding(NSUTF8StringEncoding)!
let badJsonData = badJsonString.dataUsingEncoding(NSUTF8StringEncoding)!
do
{
let parsed = try NSJSONSerialization.JSONObjectWithData(jsonData, options: NSJSONReadingOptions.AllowFragments)
let otherParsed = try NSJSONSerialization.JSONObjectWithData(badJsonData, options: NSJSONReadingOptions.AllowFragments)
}
catch let error as NSError
{
print("Done.")
}
})
task.resume()
}
catch
{
print("Error")
}
}
I am in search of one solution for fetching the desired data from this method,i want to display StateID and StateName from this string data. i can not convert the string "responseString" in NSData to have this string as NSData to fetch the desired record. Will any body please help me to fix this issue.
If you want to get the value for key from a json you should convert the json to Dictionary with this code:
Swift 3
JSONSerialization.jsonObject(with: data, options: []) as? [String:AnyObject]
Swift 2
NSJSONSerialization.JSONObjectWithData(data, options: []) as? [String:AnyObject]
let me know in the comments if I misunderstood something before the downvote, thank you.