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May 25, 2025 17:52
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| import { useEffect, useRef, useState } from 'react'; | |
| import { BrowserMultiFormatReader, IScannerControls } from '@zxing/browser'; | |
| const BarcodeScanner = ({ onResult }: { onResult: (text: string) => void }) => { | |
| const videoRef = useRef<HTMLVideoElement | null>(null); | |
| const codeReader = useRef(new BrowserMultiFormatReader()); | |
| const [controls, setControls] = useState<IScannerControls | null>(null); | |
| const [devices, setDevices] = useState<MediaDeviceInfo[]>([]); | |
| const [selectedDeviceId, setSelectedDeviceId] = useState<string | null>(null); | |
| const [scanning, setScanning] = useState(false); | |
| const [error, setError] = useState(''); | |
| useEffect(() => { | |
| setScanning(true); | |
| navigator.mediaDevices | |
| .getUserMedia({ video: true }) | |
| .then(() => | |
| BrowserMultiFormatReader.listVideoInputDevices().then((videoDevices) => { | |
| setDevices(videoDevices); | |
| if (videoDevices.length > 0) { | |
| setSelectedDeviceId(videoDevices[0].deviceId); | |
| } | |
| }) | |
| ) | |
| .catch((err) => { | |
| console.error('Access denied:', err); | |
| setError('Camera access must be allowed in the browser.'); | |
| }); | |
| }, []); | |
| useEffect(() => { | |
| if (!selectedDeviceId || !videoRef.current) return; | |
| // Stop previous scanning session | |
| if (controls) { | |
| controls.stop(); | |
| } | |
| if (scanning) { | |
| codeReader.current | |
| .decodeFromVideoDevice(selectedDeviceId, videoRef.current, (result, _error, ctrl) => { | |
| if (result) { | |
| onScan(result.getText()); | |
| } | |
| if (ctrl && ctrl !== controls) { | |
| setControls(ctrl); // Save controls for future stop | |
| } | |
| }) | |
| .catch((err) => { | |
| console.error('Scanning error:', err); | |
| }); | |
| } | |
| return () => { | |
| if (controls) { | |
| controls.stop(); | |
| } | |
| }; | |
| }, [selectedDeviceId]); | |
| const onScan = (text: string) => { | |
| console.log('Scan result:', text); | |
| onResult(text); | |
| setScanning(false); | |
| // Stop scanning after a successful scan | |
| if (controls) { | |
| controls.stop(); | |
| } | |
| }; | |
| return ( | |
| <div> | |
| {error && <p style={{ color: 'red' }}>{error}</p>} | |
| {scanning ? ( | |
| <> | |
| {devices.length > 1 && ( | |
| <select onChange={(e) => setSelectedDeviceId(e.target.value)} value={selectedDeviceId || ''}> | |
| {devices.map((device, idx) => ( | |
| <option key={idx} value={device.deviceId}> | |
| {device.label || `Camera ${idx + 1}`} | |
| </option> | |
| ))} | |
| </select> | |
| )} | |
| <video ref={videoRef} style={{ width: '100%', maxWidth: 400, transform: 'scaleX(-1)' }} /> | |
| </> | |
| ) : ( | |
| <p style={{ color: 'green' }}>Scan completed successfully!</p> | |
| )} | |
| </div> | |
| ); | |
| }; | |
| export default BarcodeScanner; |
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