67 lines
2.3 KiB
TypeScript
67 lines
2.3 KiB
TypeScript
import { PDFPageProxy } from 'pdfjs-dist';
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import { BrowserPDF417Reader, BrowserMultiFormatReader } from '@zxing/browser';
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import * as pdfJSx from 'pdfjs-dist';
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import { BarcodeFormat, DecodeHintType } from '@zxing/library';
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/**
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* Render the first page of a PDF document onto a new canvas.
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* @param {Event} event - The change event from an HTMLInputElement.
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* @return {Promise<HTMLCanvasElement | null>} The canvas with the first page of the PDF, or null if the document is not a PDF.
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*/
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export async function pdf2canvas(event: React.ChangeEvent<HTMLInputElement>): Promise<HTMLCanvasElement | null> {
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const file = (event.target as HTMLInputElement).files?.[0];
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if(!file) {
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console.error('No file was selected.');
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return null;
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}
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if (file.type !== 'application/pdf') {
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console.error(file.name, 'is not a .pdf file.');
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return null;
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}
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const reader = new FileReader();
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const data = await new Promise<Uint8Array>((resolve, reject) => {
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reader.onload = (e) => resolve(new Uint8Array((e.target as FileReader).result as ArrayBuffer));
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reader.onerror = (e) => reject(e);
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reader.readAsArrayBuffer(file);
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});
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const pdfJS = await import('pdfjs-dist');
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// worker file was manually copied to the `public` folder
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pdfJS.GlobalWorkerOptions.workerSrc = window.location.origin + '/pdf.worker.min.mjs';
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const pdf = await pdfJS.getDocument(data).promise;
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const page: PDFPageProxy = await pdf.getPage(1);
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const scale = 1.5;
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const viewport = page.getViewport({ scale });
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const canvas = document.createElement('canvas');
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const context = canvas.getContext('2d');
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canvas.height = viewport.height;
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canvas.width = viewport.width;
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await page.render({ canvasContext: context as CanvasRenderingContext2D, viewport }).promise;
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const hints = new Map();
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hints.set(DecodeHintType.POSSIBLE_FORMATS, [ BarcodeFormat.PDF_417 ]);
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// hints.set(DecodeHintType.TRY_HARDER, true);
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hints.set(DecodeHintType.PURE_BARCODE, false);
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const codeReader = new BrowserPDF417Reader(hints);
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// const codeReader = new BrowserMultiFormatReader(hints);
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const result = await codeReader.decodeFromCanvas(canvas);
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console.log(result);
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console.log(result.getResultPoints());
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// codeReader.decode(imageData);
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return null;
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} |