CaptureSDK is the easiest solution for adding barcode scanning and RFID/NFC reading capability to an iOS application

CaptureSDK Version 1.7.11 - Swift Package Manager

Socket Mobile is a leading innovator of data capture and delivery solutions for enhanced productivity.

CaptureSDK is the easiest solution for adding barcode scanning and RFID/NFC reading capability to an iOS application.

The Socket Mobile barcode scanner and contactless reader/writer are an ergonomic, fast and accurate solution to a variety of data entry scenarios.

This SDK is very easy to integrate to an application without requirement to follow a specific design architecture.

Within 10 minutes the barcode scanning or RFID/NFC reading capability can be integrated into an application.

The CaptureSDK offers a built-in barcode scanner called SocketCam, allowing to test and integrate the SDK even before getting a Socket Mobile scanner, using the exact same API, which makes the transition from using SocketCam to a Socket scanner totally frictionless.

More documentation can be found here.

Devices compatibility and CaptureSDK versions

Devices < 1.4 1.4 1.5 1.6 1.7
SocketCam C820
D600, S550, and all other barcode scanners

Table of Contents

Breaking changes

We have improved and changed some things in our architecture to prepare the future. The SDK still works as you expect. However we have made some changes that don't require too much effort from you:

  • The SDK is now a framework, not a static library anymore
  • The name is now CaptureSDK
  • cocoapods-capture and cocoapods-capture-obj-c are now deprecated. However, this new framework is more to be used in Swift projects
  • The minimum target is now iOS 11.0
  • SocketCam C820, formerly known as SoftScan has been improved and allows you to scan with your device and not with a scanner
  • Capture Helper is now included into the framework - CaptureHelper
  • Bitcode has been enabled in the version 1.5.5 but disabled in the version 1.5.7 build with Xcode 14. If you need a version with Bitcode enabled, please use the 1.5.5

Quick install notes

CaptureSDK is using Swift Package Manager.

First, you need to install Xcode.

To include the SDK in your Xcode project you have to add a Package Dependency in the project's settings section and in the tab "Package Dependencies".

Add the url of this repository:

Add the Package to the project

Once you have added the package, you should see CaptureSDK added to your Package Dependencies in Xcode's Project Navigator as follow:

Added Package to the project

VERY IMPORTANT: Supported external accessory protocols array in the application settings. In order to be able to use the Socket Mobile barcode scanners, the scanners external accessory protocol string needs to be added in the application project info in the supported external accessory protocols array.

The protocol string is com.socketmobile.chs.

If the application does use a Socket Mobile barcode scanner it will need to be MFi whitelisted before submitting the application in the App Store. Socket Mobile will handle the whitelist (MFi) application process for you, when you submit your app for MFi in your Socket Mobile developer account. This has to be done once for the first version supporting the barcode scanner.

You also need to add the following key to your Info.plist: CFBundleAllowMixedLocalizations (Localized resources can be mixed) to YES. That allows or SDK to display localized strings.

An AppKey is required in order to use CaptureSDK.

The AppKey can be generated by logging in Socket Mobile developer portal and registering your application.

This registration needs the Socket Mobile developer ID, the application Bundle ID (which is case sensitive).

Now you're ready to add import CaptureSDK in your main controller, and make it derive from one of the CaptureHelperDelegate that your application needs.

Go to the CaptureHelperDelegate source and copy paste the delegates you want to override, at minimum the onDecodedData delegate in order to be able to receive the barcode decoded data in your application.

CaptureSDK usage

CaptureSDK is described in greater details in the documentation.

The recommended way of using CaptureSDK is by using CaptureHelper. CaptureHelper is now included into the framework and not as a separate file: CaptureHelper

1. Getting a CaptureHelper instance

CaptureHelper can be instantiated in one of your application controllers using its CaptureHelper.sharedInstance static member.

2. CaptureHelper delegates stack

The chosen controller must implement one of the CaptureHelper[xxxxx]Delegate protocols in order to receive the various CaptureSDK asynchronous events.

The reference of the controller deriving from at least one of the CaptureHelper[xxxxx]Delegate can be set by using the CaptureHelper pushDelegate method.

CaptureHelper maintains a delegates stack. The delegate on top of the stack is the one that receives the notification from CaptureSDK. So if the application has multiple views requiring the scanning feature, it can push a reference of a new view controller to the CaptureHelper delegates stack, and remove that reference when the view is no longer active.

3. Opening CaptureHelper

In order to start CaptureSDK, the API uses the openWithAppInfo:withCompletionHandler method with the application information.

This open method can be called only once, in the main view controller by example, and the CaptureHelper.sharedInstance can be used at various place in the application code as singleton reference without the need to pass it through various controllers.

The application information is retrieved from the Socket Mobile developer portal, by registering the application with its application ID, the developer ID. The application key is then generated and all three initialize the AppInfo required to open CaptureSDK.

The application ID is composed by the application bundle ID prefixed by the platform on which the application is designed to run.

Here is an example of such application ID: "ios:com.socketmobile.SingleEntry". The application ID is case sensitive.

Once CaptureSDK is open, then the device arrival notification can occurs as soon as a scanner is connected to the iOS device.

The decoded data coming from the scanner can be retrieved by overriding the onDecodedData delegate.

4. Summary for integrating CaptureSDK in a Xcode project:

Example of ViewController.m for SingleEntry app:

import UIKit
import CaptureSDK

class MasterViewController:
  CaptureHelperDevicePowerDelegate {

  // Capture Helper shareInstance allows to share
  // the same instance of Capture Helper with the
  // entire application. That static property can
  // be used in any views but it is recommended
  // to open only once Capture Helper (in the main
  // view controller) and pushDelegate, popDelegate
  // each time a new view requiring scanning capability
  // is loaded or unloaded respectively.
  var captureHelper = CaptureHelper.sharedInstance

  override func viewDidLoad() {
      // Do any additional setup after loading the view, typically from a nib.
      // fill out the App Info with the Bundle ID which should start by the
      // platform on which the application is running and followed with the
      // case sensitive application Bundle ID,
      // with the Socket Mobile Portal developer ID
      // and with the Application Key generated from the Socket Mobile Developer
      // portal
      let AppInfo = SKTAppInfo()
      AppInfo.appKey = "MC0CFQD1tdTpaABkppmG+iP3dB9kolYVtwIUY8c3UmEfaPoTI3AxbPOTpNgw+fo="
      AppInfo.appID = "ios:com.socketmobile.SingleEntrySwift"
      AppInfo.developerID = "bb57d8e1-f911-47ba-b510-693be162686a"

      // there is a stack of delegates the last push is the
      // delegate active, when a new view requiring notifications from the
      // scanner, then push its delegate and pop its delegate when the
      // view is done

      // to make all the delegates able to update the UI without the app
      // having to dispatch the UI update code, set the dispatchQueue
      // property to the DispatchQueue.main
      captureHelper.dispatchQueue = DispatchQueue.main

      // open Capture Helper only once in the application
      captureHelper.openWithAppInfo(AppInfo, withCompletionHandler: { (_ result: SKTResult) in
          print("Result of Capture initialization: \(result.rawValue)")

CaptureHelper makes the application aware of a new device connection by invoking the onDeviceArrival of the protocol and, in the same way when a device disconnects, the onDeviceRemoval is invoked. A CaptureHelper device instance representing the device that is connected can be used to retrieve or set a device property.

Example of the view controller being aware of the scanner:

func didNotifyArrivalForDevice(_ device: CaptureHelperDevice, withResult result: SKTResult) {
    print("Main view device arrival:\(!)")

func didNotifyRemovalForDevice(_ device: CaptureHelperDevice, withResult result: SKTResult) {
    print("Main view device removal:\(!)")

For a combo device like the S370 which has 2 devices, there will be two didNotifyArrivalForDevice and two didNotifyRemovalForDevice notifications.

The following code shows how you can distinghuish and handle them:

func didNotifyArrivalForDevice(_ device: CaptureHelperDevice, withResult result: SKTResult) {
    print("didNotifyArrivalForDevice: \(String(describing:")
    if device.deviceInfo.deviceType == .NFCS370 {
    // handle the NFC reader of the S370
    } else if device.deviceInfo.deviceType == .scannerS370 {
    // handle the Barcode scanner of the S370

If the scanner triggers a scan, the decoded data can be retrieve in the protocol function onDecodedData.

Example of retrieving the decoded data received by a scanner:

func didReceiveDecodedData(_ decodedData: SKTCaptureDecodedData?, fromDevice device: CaptureHelperDevice, withResult result: SKTResult) {
    if result == SKTCaptureErrors.E_NOERROR {
        let rawData = decodedData?.decodedData
        let rawDataSize = rawData?.count
        print("Size: \(String(describing: rawDataSize))")
        print("data: \(String(describing: decodedData?.decodedData))")
        let string = decodedData?.stringFromDecodedData()!
        print("Decoded Data \(String(describing: string))")

The application can retrieve or modify the device properties by calling the various CaptureHelperDevice get/set methods. By example there is a method to retrieve the device friendly name: getFriendlyNameWithCompletionHandler. The call is asynchronous and will return immediately. The final result and the friendly name can be retrieved in the completion handler function block.

IMPORTANT: If a property is not accessible through the available CaptureHelper methods, it is very easy to add new ones, by creating a CaptureHelper extension class and copy and paste a similar get/set method and change the property settings inside the new method.

Creating a CaptureHelper extension allows to avoid an overwrite of a modified version of CaptureHelper when updating to a more recent CaptureSDK CocoaPods.

Sample code

Sample code can be found in GitHub / SocketMobile

SocketCam C820

We have included SocketCam C820 into the SDK, formerly known as SoftScan.

SocketCam feature refers to the capability of using the phone's camera in order to scan a barcode. The main purpose of integrating this feature in CaptureSDK is to provide a consistent interface to barcode readers.

Whether it is a Socket Mobile scanner, or simply the phone's camera, the application relies on the same interface, same API, which makes the transition from using SocketCam to a physical Socket scanner totally frictionless.

The application using the SocketCam feature needs to do 2 things differently, which Socket Mobile scanners don't require.

The first thing is to register the application main UI view to CaptureSDK so the camera overlay view can be displayed correctly by passing the UI application reference to the overlay property kSktCapturePropIdOverlayViewDevice.

The second thing is to provide a trigger logic that starts the SocketCam scanning operation. The trigger is a CaptureSDK property kSktCapturePropIdTriggerDevice that exists since the first version of CaptureSDK, whereas the overlay view property has been added to support SocketCam feature.

A third property kSktCapturePropIdSocketCamStatus allows to enable or disable the SocketCam feature. This is a CaptureSDK property that is persistent across the life cycle of the application using it.

If the SocketCam feature is enabled, CaptureSDK will send a device arrival notification to the application referencing a SocketCam device the application can control.

Once the application triggers a read, the decoded data arrives the same way with the same information than as any other Socket Mobile devices supported by CaptureSDK.

For more information please check the documentation.

Configure and connect a Socket Mobile device

CaptureSDK is designed for using all of the Socket Mobile devices on the iOS platforms.

As the application developer, CaptureSDK will give you full programmatic access to a connected Socket Mobile data capture device to customize the data source (barcode symbology or RFID Tag), data support and manage device feedback messages and functions.

The API documentation for CaptureSDK can be found here

The Socket Mobile devices are shipped by default in MFi mode which is compatible with the CaptureSDK.

The device can be configured to the Application mode by using the Socket Mobile Companion app.

You can also refer to the documentation for instructions without using Companion.


For D600, S550 and S370, the BLE Device manager must have a favorite set to * and for more information please check the documentation.

Themes selection

The Themes Selection allows to choose LEDs sequences that are played on S550 or S370 devices. Please check the documentation.

Device Notifications (Battery Level)

The Device Notifications can be configured in order to receive a notification each time one or more of those events occur:

  • Battery Level change
  • Power State change
  • Buttons State change

By default the device notifications are turned off. The recommended usage is to first check if a particular notification is turned off or on. Depending on this reading, then the application can set a specific notification to be received if it is not already set. That setting stays persistent in the Socket Mobile device across scanner shutdown. It is not recommended to set systematically a notification in the device without checking first if that setting is already correct.

For the Battery Level and Power State, it could take a long time before the state changes, so usually the initial value is read using the corresponding CaptureHelper Get method.

Last, some devices don't support some of the notifications. If that's the case, an error ESKT_NOTSUPPORTED (-15) is returned when trying to set a notification that is not supported.

For more information please check the documentation.

Closing CaptureSDK

It is not recommended to close CaptureSDK because the scanner will go through reinitialization the next time CaptureSDK is open which causes a delay before being able to use the scanner.

Closing CaptureSDK does not affect power consumption, since the scanner stays connected to the iOS host anyway.

It is also worth noting that when the Socket Mobile device is connected the power consumption is really minimal, compare to establishing a connection.

If the motive of closing CaptureSDK is to not receive any decoded data from the device then the application delegate can simply be removed and the application will no longer receive any event from the scanner until it sets its delegate back again.


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Last updated: Thu Sep 28 2023 16:08:38 GMT-0900 (Hawaii-Aleutian Daylight Time)