Question

我想使用pdf.js将pdf转换为html页面。 Pdf.js在浏览器中可以做到这一点，但是有可能在后台获取浏览器呈现的html页面，从而将n页的pdf转换为n个html文件。我正在使用node.js作为后端。我尝试了pdf2html和其他类似的npm模块，它们工作不佳，并且某些pdf出现问题。谢谢你的建议。

Answer 1

也许我找到了类似的东西-我正在使用本地PDF文件和浏览器。我对现成的viewer.js / PDF.js进行了一些小的更改，应该可以同时使用Node.js和浏览器进行处理。

此脚本包括由viewer.js Webpack的参数指定的PDF，并启动浏览器。

const fs = require('fs');
const path = require('path');
const pdf = require('process').argv[2];
const chp = require('child_process');
const datauri = require(path.join(process.env.APPDATA, 'npm/node_modules', 'datauri'));
datauri(pdf, (err, content, meta) => {
    if (err) {
        throw err;
    }
    const viewerJSpath = path.join(__dirname, './viewer.js');
    let wp = fs.readFileSync(viewerJSpath, 'utf-8');
    const pdfName = 'compressed.tracemonkey-pldi-09.pdf';
    const srcPos = [wp.indexOf(pdfName)];
    srcPos.push(srcPos[0] + pdfName.length);
    let HOSTED_VIEWER_ORIGINS = wp.indexOf('HOSTED_VIEWER_ORIGINS');
    HOSTED_VIEWER_ORIGINS = wp.indexOf(']', HOSTED_VIEWER_ORIGINS);
    wp = wp.substr(0, srcPos[0]) + content +
    wp.substr(srcPos[1], HOSTED_VIEWER_ORIGINS - srcPos[1]) + ', "file://"' +
    wp.substr(HOSTED_VIEWER_ORIGINS);
    fs.writeFileSync(viewerJSpath, wp, 'utf-8');
    const c = path.join(__dirname, 'viewer.html');
    chp.execSync(c);
});

然后尝试将原始宽度添加为renderTextLayer的appendText方法的下一个样式参数，并将元素按位置排序到TextLayerBuilder的render方法next2 this.textLayerDiv.appendChild(textLayerFrag);。

All mentioned PDF.js changes on my Github似乎只需要 web 和 build 文件夹（npm i -g datauri fox示例除外）。

使用伪造者和经过稍微修改的PDF.js，可以直接进行转换（工作在正面/反面，但元素大小略有不同）

const fs = require('fs');
const path = require('path');
const pdf = require('process').argv[2];
const datauri = require(path.join(process.env.APPDATA, 'npm/node_modules', 'datauri'));
const puppeteer = require(path.join(process.env.APPDATA, 'npm/node_modules', 'puppeteer'));
datauri(pdf, (err, content, meta) => {
    if (err) {
        throw err;
    }
    const viewerJSpath = path.join(__dirname, './viewer');
    let wp = fs.readFileSync(viewerJSpath + 'Src.js', 'utf-8');
    const pdfName = 'compressed.tracemonkey-pldi-09.pdf';
    const srcPos = [wp.indexOf(pdfName)];
    srcPos.push(srcPos[0] + pdfName.length);
    let HOSTED_VIEWER_ORIGINS = wp.indexOf('HOSTED_VIEWER_ORIGINS');
    HOSTED_VIEWER_ORIGINS = wp.indexOf(']', HOSTED_VIEWER_ORIGINS);
    wp = wp.substr(0, srcPos[0]) + content +
    wp.substr(srcPos[1], HOSTED_VIEWER_ORIGINS - srcPos[1]) + ', "file://"' +
    wp.substr(HOSTED_VIEWER_ORIGINS);
    fs.writeFileSync(viewerJSpath + '.js', wp, 'utf-8');
    (async () => {
        const browser = await puppeteer.launch({
            // headless: false
        });
        const page = await browser.pages();
        const c = path.join(__dirname, 'viewer.html');
        await page[0].goto('file:///' + c);
        page[0].exposeFunction('reader', (elLists) => {
            fs.writeFileSync(path.join(__dirname, 'PDFtexts.txt'), JSON.stringify(elLists, null, 4));
            setTimeout(() => { browser.close(); }, 100);
        });
    })();
});

木偶/铬所需的修复：

const message = exception?.message; // => exception.message
page: this.pageLabel ?? this.id // => this.pageLabel || this.id

viewer.js => viewerSrc.js基本补充：

function webViewerPageRendered({
...
  if (pageNumber < PDFViewerApplication.pagesCount) {
    arguments[0].source.eventBus.dispatch("pagenumberchanged", {
      value: pageNumber + 1
    }); // generate all remaining pages
  }
}

class BaseViewer {
  constructor(options) {
    this.pageNo = []; // rendered pages array
...
  _setCurrentPageNumber(val, resetCurrentPageView = false) {
...
    if (this.pageNo.indexOf(val) < 0) {
      this.pageNo.push(val);
    }
    if (this.pagesCount - 1 <= this.pageNo.length) {
      window.reader(elLists); // sent result back 2 node.js
    }

结果看起来像{PageNo：{ElNo：{data}，...}，...}，可以简单地转换为网页或进一步处理。

{
    "1": {
        "0": {
            "x": 99.9871,
            "y": 98.0496,
            "w": 557.695,
            "h": 22,
            "text": "Trace-based Just-in-Time Type Specialization for Dynamic",
            "ff": "sans-serif",
            "fs": "22.2695px",
            "cssText": "left: 99.9871px; top: 98.0496px; width: 557.695px; font-size: 22.2695px; font-family: sans-serif; transform: scaleX(0.970163);"
        },
        "1": {
            "x": 327.478,
            "y": 122.793,
            "w": 102.707,
            "h": 22,
            "text": "Languages",
            "ff": "sans-serif",
            "fs": "22.2695px",
            "cssText": "left: 327.478px; top: 122.793px; width: 102.707px; font-size: 22.2695px; font-family: sans-serif; transform: scaleX(0.932262);"
        },
...
    "2": {
        "0": {
            "x": 393.677,
            "y": 90.3408,
            "w": 192.909,
            "h": 11,
            "text": "1 for (var i = 2; i < 100; ++i) {",
            "ff": "monospace",
            "fs": "11.1347px",
            "cssText": "left: 393.677px; top: 90.3408px; width: 192.909px; font-size: 11.1347px; font-family: monospace; transform: scaleX(0.875232);"
        },
        "1": {
            "x": 67.0588,
            "y": 91.7599,
            "w": 173.346,
            "h": 11,
            "text": "Hence, recording and compiling a trace",
            "ff": "sans-serif",
            "fs": "11.1347px",
            "cssText": "left: 67.0588px; top: 91.7599px; width: 173.346px; font-size: 11.1347px; font-family: sans-serif; transform: scaleX(0.895175);"
        },

使用node.js和pdf.js将pdf转换为html文件

1 个答案: