How about this answer?
Reason of error:
makeCopy() returns File object. getAs() cannot be used for this. By this, the error occurs.
Workaround:
Unfortunately, in the current stage, Google Document cannot be directly exported as PNG images. So it is required to think of workarounds. Google Document can be converted to PDF. This answer uses this. As a workaround, I would like to propose to use an external API which is ConvertAPI. I thought that using the external API, the script becomes simple. This a method (PDF to PNG API) of API can be converted from PDF data to PNG data.
When you try this, for example, you can also test this using “Free Package”. When you try using “Free Package”, please Sign Up at “Free Package” and retrieve your Secret key.
Sample script:
Before you run this script, please retrieve your Secret key and set it.
var secretkey = "###"; // Please set your secret key.
var SOURCE_TEMPLATE = "1HvqYidpUpihzo_HDAQ3zE5ScMVsHG9NNlwPkN80GHK0";
var TARGET_FOLDER = "1Eue-3tJpE8sBML0qo6Z25G0D_uuXZjHZ";
var url = "https://v2.convertapi.com/convert/pdf/to/png?Secret=" + secretkey;
var options = {
method: "post",
payload: {File: DriveApp.getFileById(SOURCE_TEMPLATE).getBlob()},
}
var res = UrlFetchApp.fetch(url, options);
res = JSON.parse(res.getContentText());
res.Files.forEach(function(e) {
var blob = Utilities.newBlob(Utilities.base64Decode(e.FileData), "image/png", e.FileName);
DriveApp.getFolderById(TARGET_FOLDER).createFile(blob);
});
References:
Updated on January 11, 2023:
In the current stage, Google Apps Script can use V8 runtime. By this, there are some Javascript libraries that can be used with Google Apps Script. Ref1, Ref2 In this question, in the current stage, by using pdf-lib, all pages in a PDF file can be converted to PNG images using Google Apps Script. The sample script is as follows.
Sample script:
This method uses Drive API. Please enable Drive API at Advanced Google services.
Please set SOURCE_TEMPLATE and TARGET_FOLDER, and run main().
/**
* This is a method for converting all pages in a PDF file to PNG images.
* PNG images are returned as BlobSource[].
* IMPORTANT: This method uses Drive API. Please enable Drive API at Advanced Google services.
*
* @param {Blob} blob Blob of PDF file.
* @return {BlobSource[]} PNG blobs.
*/
async function convertPDFToPNG_(blob) {
// Convert PDF to PNG images.
const cdnjs = "https://cdn.jsdelivr.net/npm/pdf-lib/dist/pdf-lib.min.js";
eval(UrlFetchApp.fetch(cdnjs).getContentText()); // Load pdf-lib
const setTimeout = function (f, t) { // Overwrite setTimeout with Google Apps Script.
Utilities.sleep(t);
return f();
}
const data = new Uint8Array(blob.getBytes());
const pdfData = await PDFLib.PDFDocument.load(data);
const pageLength = pdfData.getPageCount();
console.log(`Total pages: ${pageLength}`);
const obj = { imageBlobs: [], fileIds: [] };
for (let i = 0; i < pageLength; i++) {
console.log(`Processing page: ${i + 1}`);
const pdfDoc = await PDFLib.PDFDocument.create();
const [page] = await pdfDoc.copyPages(pdfData, [i]);
pdfDoc.addPage(page);
const bytes = await pdfDoc.save();
const blob = Utilities.newBlob([...new Int8Array(bytes)], MimeType.PDF, `sample${i + 1}.pdf`);
const id = DriveApp.createFile(blob).getId();
Utilities.sleep(3000); // This is used for preparing the thumbnail of the created file.
const link = Drive.Files.get(id, { fields: "thumbnailLink" }).thumbnailLink;
if (!link) {
throw new Error("In this case, please increase the value of 3000 in Utilities.sleep(3000), and test it again.");
}
const imageBlob = UrlFetchApp.fetch(link.replace(/\=s\d*/, "=s1000")).getBlob().setName(`page${i + 1}.png`);
obj.imageBlobs.push(imageBlob);
obj.fileIds.push(id);
}
obj.fileIds.forEach(id => DriveApp.getFileById(id).setTrashed(true));
return obj.imageBlobs;
}
// Please run this function.
async function myFunction() {
const SOURCE_TEMPLATE = "1HvqYidpUpihzo_HDAQ3zE5ScMVsHG9NNlwPkN80GHK0";
const TARGET_FOLDER = "1Eue-3tJpE8sBML0qo6Z25G0D_uuXZjHZ";
// Use a method for converting all pages in a PDF file to PNG images.
const blob = DriveApp.getFileById(SOURCE_TEMPLATE).getBlob();
const imageBlobs = await convertPDFToPNG_(blob);
// As a sample, create PNG images as PNG files.
const folder = DriveApp.getFolderById(TARGET_FOLDER);
imageBlobs.forEach(b => folder.createFile(b));
}
- When this script is run, all pages of the inputted PDF file are converted to PNG images, and those images are created in the destination folder.
Note:
- I think that the above script works. But, in this case, when you directly copy and paste the Javascript retrieved from https://cdn.jsdelivr.net/npm/pdf-lib/dist/pdf-lib.min.js to your Google Apps Script project, the process cost for loading it can be reduced.