npm pdfjs 创建损坏的 PDF 文件
npm pdfjs creates corrupted PDF files
我正在尝试使用 npm 库 pdfjs https://www.npmjs.com/package/pdfjs 创建 PDF 文件。一旦文件的所有元素（段落）都附加到我创建文件的文档，但打开它时我收到一条消息，它说已损坏。
当我用doc.end()完成文件时，说没有功能。所以我使用了一个承诺，并尝试稍后使用这些信息。但是即使我得到一个包含所有数据的对象，我也无法使 .pdf 文件不被损坏。
这是我正在使用的代码：
const pdf = require('pdfjs')
const fs = require('fs')
function createPDF(data, options){
return new Promise((resolve, reject) => {
var doc = new pdf.Document({ font: require('pdfjs/font/Helvetica') });
var header = doc.header().table({ widths: [null, null], paddingBottom: 1*pdf.cm }).row()
header.cell().image('/images/logo.png', { height: 2*pdf.cm })
header.cell().text({ textAlign: 'right' })
.add('Example.')
.add('https://www.example.com', {
link: 'https://www.example.com',
underline: true,
color: 0x569cd6
})
doc.footer()
.pageNumber(async function(curr, total) { return curr + ' / ' + total }, { textAlign: 'center' });
resolve(doc)
});
}
var doc = createPDF();
doc.then(async (data) => {
data.pipe(fs.createWriteStream('output.pdf'))
console.log(data);
await data.end();
})
日志数据：
Document {
_readableState:
ReadableState {
objectMode: false,
highWaterMark: 16384,
buffer: BufferList { head: null, tail: null, length: 0 },
length: 0,
pipes:
WriteStream {
_writableState: [Object],
writable: true,
domain: null,
_events: [Object],
_eventsCount: 5,
_maxListeners: undefined,
path: 'output.pdf',
fd: null,
flags: 'w',
mode: 438,
start: undefined,
autoClose: true,
pos: undefined,
bytesWritten: 0 },
pipesCount: 1,
flowing: true,
ended: false,
endEmitted: false,
reading: false,
sync: true,
needReadable: false,
emittedReadable: false,
readableListening: false,
resumeScheduled: true,
paused: false,
emitClose: true,
destroyed: false,
defaultEncoding: 'utf8',
awaitDrain: 0,
readingMore: false,
decoder: null,
encoding: null },
readable: true,
domain: null,
_events:
{ read: { [Function: bound onceWrapper] listener: [Function] },
end: { [Function: bound onceWrapper] listener: [Function: onend] },
data: [Function: ondata] },
_eventsCount: 3,
_maxListeners: undefined,
version: '1.6',
info: { id: '34d7f55c-5961-4caf-9814-1902b98bee3c' },
width: 595.296,
height: 841.896,
_nextObjectId: 4,
_xref: PDFXref { objects: [], trailer: null },
_reading: false,
_length: 0,
_pending:
[ [Function],
[ [Function], [Array], [Array], [Function] ],
[Function],
[Function],
[Function],
[Function],
current: Promise { <pending> } ],
defaultFont:
AFMFont {
_data:
{ fontName: 'Helvetica',
fullName: 'Helvetica',
familyName: 'Helvetica',
italicAngle: 0,
characterSet: 'ExtendedRoman',
fontBBox: [Array],
underlinePosition: -100,
underlineThickness: 50,
capHeight: 718,
xHeight: 523,
ascender: 718,
descender: -207,
kerning: [Object],
widths: [Array] },
lineGap: 231,
parent: [Circular] },
defaultFontSize: 11,
defaultColor: [ 0, 0, 0 ],
defaultLineHeight: 1.15,
_fonts: { '/F1': { f: [Object], o: [Object] } },
_xobjects: {},
_pageFonts: {},
_annotations: [],
_aliases: AliasGenerator { nextId: { F: 2 }, blocked: Set {} },
_mapping: WeakMap {},
_currentContent: null,
_contents: [],
_contentObjCreator: null,
_finalize: [],
_template: null,
_footer: null,
_header: null,
paddingTop: 20,
paddingBottom: 20,
paddingLeft: 20,
paddingRight: 20,
_cursor:
Cursor {
width: 555.296,
height: 801.896,
x: 20,
startX: 20,
y: 821.896,
startY: 821.896,
_bottom: 20,
bottomOffset: 0 },
_pages: [ toString: [Function] ],
_pagesObj:
PDFObject {
id: 2,
rev: 0,
properties: PDFDictionary { dictionary: [Object] },
reference: PDFReference { object: [Getter] },
content: 'stream\n!!!Djz!WW3#D/OH9;Fa%r=BSfM#MB(Z!#knQ!$hOd@:O@tzzzz!!!!"zz!!)`D!!*\'"!!(J"z\'&psr`WC#h?J?20S8TbAzzzzzzz!!!!1A7]gl!!!
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\bp>]!].&];N:b]UQSL]oTl7^4a6#^O!Zf^i7*U_.UUE_I(17_cXh+`)4Iu`Cn1k`^[tca$Ib\a?@VWaZ@PSauIPQb;RPPbVdVPbr*bRc8NtVcSs1[coKIad6,gjdQc0rdmV[)e4J
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E\'1\nc/0=o,7.toJH3Wohb><p20O#pPS_`po+!Jq8`>5qWIa"r!3.er@.]Vr_*7Gs)%f9A7]glz!!!!O8OYuh2DI3M2D$[90d&kqAmoguF<FIO66JX6Ci=H:+B*5f@q?c7+ELFN6
3$uczzzzzzzzzzzzzzzzzzz=BSfMz!!$Jr!!\'K^!!!ki=BSfMzz!)NXqzD.R-sz!!!!"zzzzz!!!!#=BSfMz!!!"j!!!"p!!!"S=BSfMz!!$r3!!#"O!!!+_F(o80z6W-l+A7]glz
!!!!N;IsHOEb0,uAKY#fATqj+B-9Q[DIdI\'Bl@l3Bl5%b77/1U0f_-M/M\n4zzzzzzzzzzzzzzzzzzzz=BSfMz!!)`D!!*\'"!!(J"FCf]=z6Z6phEbT0"F<F.mFCfK1@<?4%DII
?(6Z6dZEZd_fDKB`:FD5l7/0H]%0KB+5F(R3`z!!*Kr!!!2[s8V[;!!!7g!!)tYs8Vtis8W%l!!!,U!!\'fW~>\nendstream\n' },
_currentColorSpace: '/CS1',
_doc: [Circular],
_parent: [Circular],
_ended: false,
_current:
Footer {
_doc: [Circular],
_parent: [Circular],
_cursor:
ClonedCursor {
width: 555.296,
height: 801.896,
bottomOffset: 0,
startX: 20,
startY: 821.896,
_root: [Object] },
_ended: false,
_current: null,
_pending:
[ [Function],
[Array],
[Function],
[Function],
[Function],
[Function],
current: [Object] ],
_objects: [],
_pageNumbers: [] } }
看起来内容在那里，但无法获取。当 await data.end(); 为 运行 时，它显示下一个错误日志显示：
TypeError: Invalid value used as weak map key TypeError: Invalid value used as weak map key
at WeakMap.set (native)
at Document._useXObject (/home/developer1/Projects/bfreit_website/node_modules/pdfjs/lib/document.js:255:21)
at module.exports (/home/developer1/Projects/bfreit_website/node_modules/pdfjs/lib/image/render.js:16:23)
at _pending.push (/home/developer1/Projects/bfreit_website/node_modules/pdfjs/lib/fragment.js:143:30)
at Document._next (/home/developer1/Projects/bfreit_website/node_modules/pdfjs/lib/document.js:169:36)
at _pending.current.next.then (/home/developer1/Projects/bfreit_website/node_modules/pdfjs/lib/document.js:172:19)
at <anonymous>
at process._tickCallback (internal/process/next_tick.js:188:7)
预期的输出是一个正确的 .pdf 文件。但即使我的输出是 .pdf 文件，它也已损坏。
Unable to open document “file:///home/developer1/Projects/pdf/output.pdf”.
Error when trying to open the file:
PDF document is damaged
如果你能帮我解决这个问题，或者用你的知识库来帮助我解决这个问题，那就太棒了。
我找不到 pdfjs 库的解决方案。但是我找到了一个在我的项目中效果更好的库。它真的很容易使用。
简短示例：
const pdf = require('pdfkit');
const fs = require('fs');
const doc = new pdf();
doc.pipe(fs.createWriteStream('/my/path'));
doc.fontSize(10).text('Fontsize 10')
doc
.fontSize(18)
.text('Font Size 18 aligned right', {align: 'right'});
doc.moveDown();
doc.fontSize(14).text('Font size 14 aligned center',{align:'center' })
doc.end();
我正在尝试使用 npm 库 pdfjs https://www.npmjs.com/package/pdfjs 创建 PDF 文件。一旦文件的所有元素（段落）都附加到我创建文件的文档，但打开它时我收到一条消息，它说已损坏。
当我用doc.end()完成文件时，说没有功能。所以我使用了一个承诺，并尝试稍后使用这些信息。但是即使我得到一个包含所有数据的对象，我也无法使 .pdf 文件不被损坏。
这是我正在使用的代码：
const pdf = require('pdfjs')
const fs = require('fs')
function createPDF(data, options){
return new Promise((resolve, reject) => {
var doc = new pdf.Document({ font: require('pdfjs/font/Helvetica') });
var header = doc.header().table({ widths: [null, null], paddingBottom: 1*pdf.cm }).row()
header.cell().image('/images/logo.png', { height: 2*pdf.cm })
header.cell().text({ textAlign: 'right' })
.add('Example.')
.add('https://www.example.com', {
link: 'https://www.example.com',
underline: true,
color: 0x569cd6
})
doc.footer()
.pageNumber(async function(curr, total) { return curr + ' / ' + total }, { textAlign: 'center' });
resolve(doc)
});
}
var doc = createPDF();
doc.then(async (data) => {
data.pipe(fs.createWriteStream('output.pdf'))
console.log(data);
await data.end();
})
日志数据：
Document {
_readableState:
ReadableState {
objectMode: false,
highWaterMark: 16384,
buffer: BufferList { head: null, tail: null, length: 0 },
length: 0,
pipes:
WriteStream {
_writableState: [Object],
writable: true,
domain: null,
_events: [Object],
_eventsCount: 5,
_maxListeners: undefined,
path: 'output.pdf',
fd: null,
flags: 'w',
mode: 438,
start: undefined,
autoClose: true,
pos: undefined,
bytesWritten: 0 },
pipesCount: 1,
flowing: true,
ended: false,
endEmitted: false,
reading: false,
sync: true,
needReadable: false,
emittedReadable: false,
readableListening: false,
resumeScheduled: true,
paused: false,
emitClose: true,
destroyed: false,
defaultEncoding: 'utf8',
awaitDrain: 0,
readingMore: false,
decoder: null,
encoding: null },
readable: true,
domain: null,
_events:
{ read: { [Function: bound onceWrapper] listener: [Function] },
end: { [Function: bound onceWrapper] listener: [Function: onend] },
data: [Function: ondata] },
_eventsCount: 3,
_maxListeners: undefined,
version: '1.6',
info: { id: '34d7f55c-5961-4caf-9814-1902b98bee3c' },
width: 595.296,
height: 841.896,
_nextObjectId: 4,
_xref: PDFXref { objects: [], trailer: null },
_reading: false,
_length: 0,
_pending:
[ [Function],
[ [Function], [Array], [Array], [Function] ],
[Function],
[Function],
[Function],
[Function],
current: Promise { <pending> } ],
defaultFont:
AFMFont {
_data:
{ fontName: 'Helvetica',
fullName: 'Helvetica',
familyName: 'Helvetica',
italicAngle: 0,
characterSet: 'ExtendedRoman',
fontBBox: [Array],
underlinePosition: -100,
underlineThickness: 50,
capHeight: 718,
xHeight: 523,
ascender: 718,
descender: -207,
kerning: [Object],
widths: [Array] },
lineGap: 231,
parent: [Circular] },
defaultFontSize: 11,
defaultColor: [ 0, 0, 0 ],
defaultLineHeight: 1.15,
_fonts: { '/F1': { f: [Object], o: [Object] } },
_xobjects: {},
_pageFonts: {},
_annotations: [],
_aliases: AliasGenerator { nextId: { F: 2 }, blocked: Set {} },
_mapping: WeakMap {},
_currentContent: null,
_contents: [],
_contentObjCreator: null,
_finalize: [],
_template: null,
_footer: null,
_header: null,
paddingTop: 20,
paddingBottom: 20,
paddingLeft: 20,
paddingRight: 20,
_cursor:
Cursor {
width: 555.296,
height: 801.896,
x: 20,
startX: 20,
y: 821.896,
startY: 821.896,
_bottom: 20,
bottomOffset: 0 },
_pages: [ toString: [Function] ],
_pagesObj:
PDFObject {
id: 2,
rev: 0,
properties: PDFDictionary { dictionary: [Object] },
reference: PDFReference { object: [Getter] },
content: 'stream\n!!!Djz!WW3#D/OH9;Fa%r=BSfM#MB(Z!#knQ!$hOd@:O@tzzzz!!!!"zz!!)`D!!*\'"!!(J"z\'&psr`WC#h?J?20S8TbAzzzzzzz!!!!1A7]gl!!!
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_currentColorSpace: '/CS1',
_doc: [Circular],
_parent: [Circular],
_ended: false,
_current:
Footer {
_doc: [Circular],
_parent: [Circular],
_cursor:
ClonedCursor {
width: 555.296,
height: 801.896,
bottomOffset: 0,
startX: 20,
startY: 821.896,
_root: [Object] },
_ended: false,
_current: null,
_pending:
[ [Function],
[Array],
[Function],
[Function],
[Function],
[Function],
current: [Object] ],
_objects: [],
_pageNumbers: [] } }
看起来内容在那里，但无法获取。当 await data.end(); 为 运行 时，它显示下一个错误日志显示：
TypeError: Invalid value used as weak map key TypeError: Invalid value used as weak map key
at WeakMap.set (native)
at Document._useXObject (/home/developer1/Projects/bfreit_website/node_modules/pdfjs/lib/document.js:255:21)
at module.exports (/home/developer1/Projects/bfreit_website/node_modules/pdfjs/lib/image/render.js:16:23)
at _pending.push (/home/developer1/Projects/bfreit_website/node_modules/pdfjs/lib/fragment.js:143:30)
at Document._next (/home/developer1/Projects/bfreit_website/node_modules/pdfjs/lib/document.js:169:36)
at _pending.current.next.then (/home/developer1/Projects/bfreit_website/node_modules/pdfjs/lib/document.js:172:19)
at <anonymous>
at process._tickCallback (internal/process/next_tick.js:188:7)
预期的输出是一个正确的 .pdf 文件。但即使我的输出是 .pdf 文件，它也已损坏。
Unable to open document “file:///home/developer1/Projects/pdf/output.pdf”.
Error when trying to open the file:
PDF document is damaged
如果你能帮我解决这个问题，或者用你的知识库来帮助我解决这个问题，那就太棒了。
我找不到 pdfjs 库的解决方案。但是我找到了一个在我的项目中效果更好的库。它真的很容易使用。 简短示例：
const pdf = require('pdfkit');
const fs = require('fs');
const doc = new pdf();
doc.pipe(fs.createWriteStream('/my/path'));
doc.fontSize(10).text('Fontsize 10')
doc
.fontSize(18)
.text('Font Size 18 aligned right', {align: 'right'});
doc.moveDown();
doc.fontSize(14).text('Font size 14 aligned center',{align:'center' })
doc.end();