35 lines
1.5 KiB
JavaScript
35 lines
1.5 KiB
JavaScript
const fs = require('fs')
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const path = require('path')
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const { createCanvas, DOMMatrix, ImageData, Path2D } = require('@napi-rs/canvas')
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global.DOMMatrix = DOMMatrix
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global.ImageData = ImageData
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global.Path2D = Path2D
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if (!process.getBuiltinModule) process.getBuiltinModule = name => require(name)
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async function main() {
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const pdfjs = await import('pdfjs-dist/legacy/build/pdf.mjs')
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const root = path.resolve(__dirname, '..', '..')
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const pdfPath = path.resolve(root, 'doc', '大连元利流体技术有限公司MES系统用户操作手册_V1.1_2026-07-23.pdf')
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const pageNumber = Number(process.argv[2] || 1)
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const outputPath = path.resolve(__dirname, `pdf-page-${pageNumber}.png`)
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const task = pdfjs.getDocument({ data: new Uint8Array(fs.readFileSync(pdfPath)), disableWorker: true })
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const pdf = await task.promise
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if (pageNumber < 1 || pageNumber > pdf.numPages) throw new Error(`Page ${pageNumber} is outside 1-${pdf.numPages}`)
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const page = await pdf.getPage(pageNumber)
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const viewport = page.getViewport({ scale: 1.5 })
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const canvas = createCanvas(Math.ceil(viewport.width), Math.ceil(viewport.height))
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const context = canvas.getContext('2d')
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context.fillStyle = '#ffffff'
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context.fillRect(0, 0, canvas.width, canvas.height)
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await page.render({ canvasContext: context, viewport }).promise
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fs.writeFileSync(outputPath, canvas.toBuffer('image/png'))
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console.log(`PDF pages: ${pdf.numPages}`)
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console.log(`Rendered: ${outputPath}`)
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}
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main().catch(error => {
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console.error(error.stack || error.message)
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process.exitCode = 1
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})
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