I have a function on nodejs that generates an image from many images and then generate a pdf file from that. Im trying with just one image but i need to add more, but this doesnt seems to work
function HelperHandler() {
this.pdf = function(req, res, next) {
var doc = new PDFDocument;
mergeImages(function(err, image) {
if (err)
return res.json(err);
doc.image(image, 100, 100);
doc.output(function(string) {
res.contentType = "application/pdf";
res.send(string);
});
})
}
}
var mergeImages = function(callback) {
var Canvas = require("canvas")
, fs = require("fs");
fs.readFile(global.root_path + "/images/bg.jpg", function(err, data) {
if (err)
callback("error loading image");
else {
var canvas = new Canvas(408, 939)
, img = new Canvas.Image(data);
ctx = canvas.getContext("2d");
img.onload = function() {
ctx.drawImage(img, 0, 0, 408, 939);
}
canvas.toDataURL('image/png', function(err, str) {
callback(null, str);
});
}
});
}
Error
Error: ENAMETOOLONG, name too long 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZgAAAOrCAYAAABqSpB/AAAABmJLR0QA/wD/AP+gvaeTAAAF5UlEQVR4nO3BMQEAAADCoPVPbQo/oAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAICjAWckAAHF4EUcAAAAAElFTkSuQmCC'
at Object.openSync (fs.js:427:18)
at Object.readFileSync (fs.js:284:15)
at Function.open (/Users/jtomasrl/code/app/server/node_modules/pdfkit/js/image.js:27:28)
at PDFDocument.image (/Users/jtomasrl/code/app/server/node_modules/pdfkit/js/mixins/images.js:27:26)
at /Users/jtomasrl/code/app/server/lib/handler/current/helper.js:15:11
at /Users/jtomasrl/code/app/server/lib/handler/current/helper.js:41:9
at /Users/jtomasrl/code/app/server/node_modules/canvas/lib/canvas.js:217:7
Adding images to PDFKit documents is an easy task. Just pass an image path, buffer, or data uri with base64 encoded data to the image method along with some optional arguments. PDFKit supports the JPEG and PNG formats.
Creating a document Creating a PDFKit document is quite simple. Just require the pdfkit module in your JavaScript source file and create an instance of the PDFDocument class. const PDFDocument = require('pdfkit'); const doc = new PDFDocument; PDFDocument instances are readable Node streams.
PDFKit is a PDF document generation library for Node and the browser that makes creating complex, multi-page, printable documents easy. The API embraces chainability, and includes both low level functions as well as abstractions for higher level functionality.
You can use a buffer or a path with PDFKit image.
But you can't use a base64 URL, you need to decode this string to a buffer.
To use base64 data:
doc.image(new Buffer(image.replace('data:image/png;base64,',''), 'base64'), 100, 100); // this will decode your base64 to a new buffer
More information on base64 de/encode with Node Buffer here.
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