pdf page count

[savgiannis]

I can specify the page number to be converted or the number -1 to convert all pages. Is there any way to know the page count to setup a loop? Possibly to await each page conversion or convert in batches until there are no other pages.

If not then this is a feature request. If yes could you tell me the trick?

By the way this plugin is awesome. Thank you.

[PaulMest]

My team uses pdf.js from Mozilla to get the metadata. Here is an example that uses pdf.js to get the total count of pages:

https://github.com/mozilla/pdf.js/blob/master/examples/node/getinfo.js

[redstone78]

I used the pdf-lib package and used the getPageCount to get the # of pages. https://github.com/Hopding/pdf-lib/blob/d213f921237daca7a5e21fb38eb69d733ff34796/src/api/PDFDocument.ts#L539

Example:
const pdfLoadDoc = await PDFDocument.load(Buffer.from(pdfFile.Body, 'base64'))
const pageCount = pdfLoadDoc.getPageCount()
console.log('page count', pageCount)

[irgipaulius]

import { getDocument } from "pdfjs-dist";

/** returns size and resolution of the pdf */
export async function getPdfFormatInfo(dataBuffer: Buffer): Promise<{
  numPages: number;
  width: number;
  height: number;
}> {
  const pdfDocument = await getDocument({ data: dataBuffer }).promise;
  const page = await pdfDocument.getPage(1);
  const viewport = page.getViewport({ scale: 1 });

  const width = Math.floor(viewport.width);
  const height = Math.floor(viewport.height);
  const finalHeight = 1080;
  const finalWidth = (finalHeight / height) * width;

  return {
    numPages: pdfDocument.numPages,
    width,
    height,
    finalWidth,
    finalHeight,
  };
}

savgiannis here you go.

also, have a look at this example: https://github.com/yakovmeister/pdf2pic-examples/blob/master/from-file-to-images.js

  const convert = fromPath(specimen1, baseOptions);
  
  return convert.bulk(-1);

seems like -1 is already implemented. but I do not recommend it, because for me, imagemagick runs out of memory because bulk instantiates it for each pdf page.

Do you think it's ok to close this issue now?