Pdf.js (for node) not rendering entire contents of pdf

问题

I am trying to search the text of of a pdf using https://www.npmjs.com/package/pdfjs-dist-for-node.

My code looks like this:

 gettext: function(){
     var data = '../static/example.pdf';
         return pdfjs.getDocument(data).then(function(pdf) {
     var pages = [];
     for (var i = 0; i < pdf.numPages; i++) {
                 pages.push(i);
     }
     return Promise.all(pages.map(function(pageNumber) {
                 return pdf.getPage(pageNumber + 1).then(function(page) {
         return page.getTextContent().then(function(textContent) {
                         return textContent.items.map(function(item) {
             return item.str;
                         }).join(' ');
         });
                 });
     })).then(function(pages) {
         return pages.join("\r\n")
     });
         }).then(function(pages){
     console.log(pages)
     });


 }

This seems to work, but it skips parts of the text. Specifically, it skips whatever I can't highlight with the mouse in the original pdf doc. Is there a way to get pdf.js to pick up on this data?

回答1:

If the text is not selectable when you view the PDF, that means it's actually an image, which therefore means you won't be able to search for it.

So unfortunately, this is not possible, unless you set up something else to do some OCR on the PDF first to try to convert images to text.

来源：https://stackoverflow.com/questions/43868315/pdf-js-for-node-not-rendering-entire-contents-of-pdf