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
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.