I am currently using Expo-Print's function PrintToFileAsync to create a PDF file from an HTML string, and then transferring its base64 representation via an API. The issue is that the PDF, which is created and stored in the app's cache, contains sensitive information which should never be stored in the cache. I am currently just deleting the PDF file once the base64 has been transferred but this is not idea.
Is there a way to convert from HTML to PDF to base64 without saving the PDF in the middle?
Related
I have a webform with and want to open it on smartphone - than take pictures of some documents which need to be merged in one PDF, and on the end this file need to be uploaded to server.
My solution is to use Google Drive to upload PDF (scan) to GDrive and then somehow download this file from gdrive to server via some sort of widget (any links appreciate) installed on website.
Maybe someone have a better idea?
I know its late but my answer might help others. I also face the same challenge and implemented a custom solution based on Javascript and Since you are using web form so this solution will perfectly fits on your need.
You have to use JSPdf javascript library, JSPdf provide you pdf object in your browser and you can upload it download it and there are many other thing to play with.
First you have to initialize JSPdf object as per your requirement. I am creating PDF with page size width:500px and height 500px.
pdf = new jsPDF("l", "pt", [500,500]);
Simply when you will take picture from camera you will have each picture in form of base64, that base64 format you have to insert in JSPdf object
pdf.addImage(imgData, 'JPEG', 0, 0);
you can repeat the above code to add pictures from camera as much as you want, at the back-end these images are compiling and creating pdf document where each page have each images in sequence.
Once you are done, you can get PDF object in form of base64 object using below code that you can upload to any server.
pdf.output('datauristring')
above is only pdf part, you can find complete working example including camera part here Javascript Component to Scan Document
I am trying to use print.js(crabbly) https://github.com/crabbly/print.js to send a PDF to a folder on my website instead of printing it.
My task is to save form data into a PDF and save the PDF in a folder on my website once the user submits. I like the way print.js creates the PDF and sends it to print but I need it to send to my folder...maybe through php?
Thanks for anyone's help!!
You need to handle that form submission on the server side. Once you receive the form request or the payload, you can then use it to create your own PDF.
Looks like you may be using Php in the back-end, if that's the case, the FPDF class should have everything you need to create your PDF:
http://www.fpdf.org/
If you use Laravel, here is a convenient package wrapping the FPDF class so we can import it with composer:
https://github.com/crabbly/fpdf-laravel
My web page has a document viewer (canvas) where I will bind a multi-page tif file stream.
There is a functionality to delete pages from the file, I am using the ABCpdf library to convert the tif file stream to a pdf stream and delete a particular page. But I don't see any way to convert back the pdf stream to a tif stream.
Please help.
You want the GetData() method, called as GetData("foo.tif"). The filename passes is ignored except that its extension is checked to see what format to use. The return value is an array of Byte.
https://www.websupergoo.com/helppdfnet/default.htm?page=source%2F5-abcpdf%2Fxrendering%2F1-methods%2Fgetdata.htm
I am working on iPad application in which i have to show PDF data into table. Firstly,I want to fetch PDF file content into NSString, how to achieve this. I tried a lot but i am unable to get it.
Thanks
You have to use Quartz2d.
Check this page of the Quartz 2D Programming Guide, it covers everything you need to open and parse a PDF file in iOS. Note that it is not a simple task, since there's no method to extract the full text in one line. You have to work with the data as an input stream, using a CGPDFScanner
I want to create html file by which i could read any PDF file by providing the source of that PDF file. How can i do this by using only html5?
For example i want read a pdf file which is available in C drive so scr="http://virdir/mypdf.pdf".
I want something like this.
You want to use the developing HTML 5 File API. Mozilla has a good explanation, and you can also refer directly to the spec.
Since PDF is a binary format, you will probably want to use FileReader.readAsBinaryString().
Parsing and rendering (e.g. to a canvas) a PDF in JavaScript is possible, but it would be very challenging.
Here is an open source pdf reader written in javascript.
https://github.com/mozilla/pdf.js
There are APIs available to play with. It comes built into Firefox browser and has good support from Mozilla community.