henry-capture-vision-react-native
v1.1.13
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Dynamsoft Capture Vision React Native SDK
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Dynamsoft Capture Vision React-Native Edition
Dynamsoft Capture Vision (DCV) is an aggregating SDK of a series of specific functional products including:
- Dynamsoft Camera Enhancer (DCE) which provides camera enhancements and UI configuration APIs.
- Dynamsoft Barcode Reader (DBR) which provides barcode decoding algorithm and APIs.
- Dynamsoft Label Recognizer (DLR) which provides label content recognizing algorithm and APIs.
- Dynamsoft Document Normalizer (DDN) which provides document scanning algorithms and APIs.
Note: DCV React-Native edition currently only includes DCE and DBR modules. DLR and DDN modules are still under development and will be included in the future.
Table of Contents
System Requirements
React Native
- Supported Version: 0.60 or higher
Android
- Supported OS: Android 5.0 (API Level 21) or higher.
- Supported ABI: armeabi-v7a, arm64-v8a, x86 and x86_64.
- Development Environment: Android Studio 3.4+ (Android Studio 4.2+ recommended).
- JDK: 1.8+
iOS
- Supported OS: iOS 10.0 or higher.
- Supported ABI: arm64 and x86_64.
- Development Environment: Xcode 7.1 and above (Xcode 13.0+ recommended), CocoaPods 1.11.0+.
Others
- Node: 16.15.1 recommended
Installation
yarn
yarn add dynamsoft-capture-vision-react-native
npm
npm install dynamsoft-capture-vision-react-native
Build Your Barcode Scanner App
Now you will learn how to create a simple barcode scanner using Dynamsoft Capture Vision SDK.
Set up Development Environment
If you are a beginner on React Native, please follow the guide on React Native official website to set up the development environment.
Initialize the Project
Create a new React Native project.
npx react-native init SimpleBarcodeScanner
Note: This sample uses react 17.0.2 and react-native 0.65.0.
Include the Library
Add the SDK to your new project. Once the SDK is added, you will see a reference to it in the package.json.
yarn
yarn add dynamsoft-capture-vision-react-native
npm
npm install dynamsoft-capture-vision-react-native
For iOS, you must install the necessary native frameworks from cocoapods to run the application. In order to do this, the pod install
command needs to be run as such:
cd ios
pod install
Configure the Barcode Reader
In App.js
, import the following components:
import React from 'react';
import {Text} from 'react-native';
import {
DynamsoftBarcodeReader,
DynamsoftCameraView,
EnumBarcodeFormat
} from 'dynamsoft-capture-vision-react-native';
Next in App.js
, let's define the state
to your component. In the state
, add a results
variable, initialized to null. In the following steps, we will store the newly decoded barcodes to results
.
class App extends React.Component {
state = {
results: null
};
}
export default App;
Next is the componentDidMount
implementation. First up is adding the code to start barcode decoding:
class App extends React.Component {
...
componentDidMount() {
(async () => {
// Initialize the license so that you can use full feature of the Barcode Reader module.
try {
await DynamsoftBarcodeReader.initLicense("DLS2eyJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSJ9");
} catch (e) {
console.log(e);
}
// Create a barcode reader instance.
this.reader = await DynamsoftBarcodeReader.createInstance();
// Add a result listener. The result listener will handle callback when barcode result is returned.
this.reader.addResultListener((results) => {
// Update the newly detected barcode results to the state.
this.setState({results});
});
// Enable video barcode scanning.
// If the camera is opened, the barcode reader will start the barcode decoding thread when you triggered the startScanning.
// The barcode reader will scan the barcodes continuously before you trigger stopScanning.
this.reader.startScanning();
})();
}
...
}
After implementing componentDidMount
, componentWillUnmount
will then include code to stop the barcode decoding and remove the result listener.
class App extends React.Component {
...
async componentWillUnmount() {
// Stop the barcode decoding thread when your component is unmount.
await this.reader.stopScanning();
// Remove the result listener when your component is unmount.
this.reader.removeAllResultListeners();
}
...
}
Rendering the UI
Lastly, let's create the DynamsoftCameraView
UI component in the render
function.
class App extends React.Component {
...
render() {
// Add code to fetch barcode text and format from the BarcodeResult
let results = this.state.results;
let resultBoxText = "";
if (results && results.length>0){
for (let i=0;i<results.length;i++){
resultBoxText+=results[i].barcodeFormatString+"\n"+results[i].barcodeText+"\n";
}
}
// Render DynamsoftCameraView componment.
return (
<DynamsoftCameraView
style={
{
flex: 1
}
}
ref = {(ref)=>{this.scanner = ref}}
overlayVisible={true}
>
{/*Add a text box to display the barcode result.*/}
<Text style={
{
flex: 0.9,
marginTop: 100,
textAlign: "center",
color: "white",
fontSize: 18,
}
}>{results && results.length > 0 ? resultBoxText : "No Barcode Detected"}</Text>
</DynamsoftCameraView>
);
}
}
Configure Camera Permissions
You need to set the "Privacy - Camera Usage Description" field in the Info.plist
file for iOS. If this property is not set, the iOS application will fail at runtime. In order to set this property, you might need to use Xcode and open the corresponding .xcworkspace
located in the ios
folder. Once open, you can edit the Info.plist
to include this property.
Run the Project
Run Android on Windows
In the command line interface (we recommend using Powershell), go to your project folder and run the following command:
npx react-native run-android
Run iOS on macOS
In the terminal, go to the project folder in your project:
npx react-native run-ios
Note:
- The application needs to run on a physical device rather than a simulator as it requires the use of the camera. If you try running it on a simulator, you will most likely run into a number of errors/failures.
- On iOS, in order to run the React Native app on a physical device you will need to install the
ios-deploy
library. Afterwards, you can run the react native app from the terminal as suchnpx react-native run-ios --device
assuming it's the only device connected to the Mac.- Alternatively on iOS, you can simply open the
xcworkspace
of the project found in theios
folder using Xcode and run the sample on your connected iOS device from there. The advantage that this offers is that it is easier to deal with the developer signatures for deployment in there.
Samples
You can view all the DCV React Native samples via the following links:
- Barcode reader simple sample
API References
View the API reference of DCV React Native Edition to explore the full feature of DCV:
- DCV API Reference - React Native Edition
- DynamsoftBarcodeReader Class
- DynamsoftCameraEnhancer Class
License
- You can also request an extension for your trial license in the customer portal
Contact
https://www.dynamsoft.com/company/contact/