Send Barcode string to an API endpoint in Swift - ios

Question

I'm very new in programing, I have been learning swift5 for a few months now. I'm trying to make an APP that scan a 1D or 2D barcode, take the string and send it to an API endpoint which will give me back some info, for example, product number and batch number.
For the barcode part I'm using a really nice software from GitHub called BarcodeScanner. It is running without any issue and I'm able to get the string from the barcode it reads.
Once I have the string I'm able to send it to the API endpoint but then it gets stuck there.
If I run the same code in a playground it works without problems, it makes the request and I can see the answer in JSON from the server. If I run the code on the iPhone then it gets stuck. Of course I cannot use the scanning part when in playground, I use it to test the networking part and communication with the API.
Here is my Networking.swift file, it has some print() used for debug:
import Foundation
import UIKit
protocol NetworkManagerDelegate: class {
func didUpdatePharmo(pharmo: PharmoModel)
func didUpdateBarcode(barcode: BarcodeModel)
}
public struct NetworkManager {
var delegate: NetworkManagerDelegate?
let pharmoURL = "https://someurl.com/api"
let pharmoEndpoint = "https://someendpoint.com/api"
func fetchData(productNumber: String) {
let urlString = "\(pharmoURL)&number=\(productNumber)"
performRequestProductInfo(urlString: urlString)
print(urlString)
}
func fetchEndpoint(dataMatrix: String) {
let urlString = "\(pharmoEndpoint)&datamatrix=\(dataMatrix)"
performRequestEndpoint(urlString: urlString)
print(urlString)
}
func performRequestEndpoint(urlString: String) {
if let url = URL(string: urlString) {
let session = URLSession(configuration: .default)
var request = URLRequest(url: url)
request.httpMethod = "GET"
let task = session.dataTask(with: request) { (data, response, error) in
if error != nil {
print(error!)
return
}
if let response = response as? HTTPURLResponse {
print("EndPoint HTTP Status code: \(response.statusCode)")
}
if let safeData = data {
if let barcode = self.parseJSONEndpoint(endPointData: safeData) {
self.delegate?.didUpdateBarcode(barcode: barcode)
}
}
}
task.resume()
}
}
func parseJSONEndpoint(endPointData: Data) -> BarcodeModel? {
let decoder = JSONDecoder()
do {
let decodedData = try decoder.decode(BarcodeData.self, from: endPointData)
let productNumber = decodedData.product_number
let batchNumber = decodedData.batchnumber
let barcode = BarcodeModel(productNumber: productNumber, batchNumber: batchNumber)
print(batchNumber)
return barcode
} catch {
print(error)
return nil
}
}
func performRequestProductInfo(urlString: String) {
if let url = URL(string: urlString) {
let session = URLSession(configuration: .default)
var request = URLRequest(url: url)
request.httpMethod = "GET"
let task = session.dataTask(with: request) { (data, response, error) in
if error != nil {
print(error!)
return
}
if let response = response as? HTTPURLResponse {
print("ProductInfo HTTP Status code: \(response.statusCode)")
}
if let safeData = data {
if let pharmo = self.parseJSONProductInfo(pharmoData: safeData) {
self.delegate?.didUpdatePharmo(pharmo: pharmo)
}
}
}
task.resume()
}
}
func parseJSONProductInfo(pharmoData: Data) -> PharmoModel? {
let decoder = JSONDecoder()
do {
let decodedData = try decoder.decode(PharmoData.self, from: pharmoData)
let id = decodedData.id
let number = decodedData.number
let name = decodedData.name
let atcCode = decodedData.atc_code
let imagePath = decodedData.image_path
let displayImage = decodedData.display_image
let storageGroupId = decodedData.storage_group_id
let animalGroupId = decodedData.animal_group_id
let udlevbest = decodedData.udlevbest
let packageSizeText = decodedData.package_size_text
let packageSizeNum = decodedData.package_size_num
let unitCode = decodedData.unit_code
let strengthText = decodedData.strength_text
let prodPrice = decodedData.prod_price
let aupPrice = decodedData.aup_price
let aupInstPrice = decodedData.aup_inst_price
let animalGroups = decodedData.animal_groups
let udleveringsbestemmelse = decodedData.udleveringsbestemmelse
let animalGroup = decodedData.animal_group
let storageGroup = decodedData.storage_group
let species = decodedData.species
let indications = decodedData.indications
let substances = decodedData.substances
let manufacturer = decodedData.manufacturer
let pharmo = PharmoModel(id: id, number: number, name: name, atc_code: atcCode, image_path: imagePath, display_image: displayImage, storage_group_id: storageGroupId, animal_group_id: animalGroupId, udlevbest: udlevbest, package_size_text: packageSizeText, package_size_num: packageSizeNum, unit_code: unitCode, strength_text: strengthText, prod_price: prodPrice, aup_price: aupPrice, aup_inst_price: aupInstPrice, animal_groups: animalGroups, udleveringsbestemmelse: udleveringsbestemmelse, animal_group: animalGroup, storage_group: storageGroup, species: species, indications: indications, substances: substances, manufacturer: manufacturer)
print(name)
return pharmo
} catch {
print(error)
return nil
}
}
}
From the ViewController.swift running the barcode scanner I call the function fetchEndpoint(dataMatrix: String)
extension ViewController: BarcodeScannerCodeDelegate {
func scanner(_ controller: BarcodeScannerViewController, didCaptureCode code: String, type: String) {
print("Barcode Data: \(code)")
print("Symbology Type: \(type)")
DispatchQueue.main.asyncAfter(deadline: .now() + 3.0) {
networkManager.fetchEndpoint(dataMatrix: code)
}
}
}
From the console output I can see this 2 print() statements from ViewController.swift:
print("Barcode Data: \(code)")
print("Symbology Type: \(type)")
I can also see this print() statement from Networking.swift:
print(urlString)
But nothing happends after that. Again if I run the same code in a playground it works fine. I have also made requests using Postman, so I can see the JSON file and be sure the urlstring is working.
Anyone have some idea what am I doing wrong?

Answer 1

I was able to find the problem. The string being read from the scanner had an non ASCII character.
At any point XCode said anything about a non ASCII character, I had to copy the string into a playground, then I received this error:
Unprintable ASCII character found in source file
I copied the string into a terminal shell and I was able to see the character.
datamatrix=^]01036611030467831722113010RXT0711GC
I will try to use URLComponents or percent encoding