Convert Blob data to Raw buffer in javascript or node

[kamaldeepoodles]

I am using a plugin jsPDF which generates PDF and saves it to local file system. Now in jsPDF.js, there is some piece of code which generates pdf data in blob format as:-

var blob = new Blob([array], {type: "application/pdf"});

and further saves the blob data to local file system. Now instead of saving I need to print the PDF using plugin node-printer (https://github.com/tojocky/node-printer).

Here is some sample code to do so

var fs = require('fs'),
var dataToPrinter;

fs.readFile('/home/ubuntu/test.pdf', function(err, data){
dataToPrinter = data;
}

var printer = require("../lib");
printer.printDirect({
data: dataToPrinter,
printer:'Deskjet_3540',
type: 'PDF',
success: function(id) {
console.log('printed with id ' + id);
},
error: function(err) {
console.error('error on printing: ' + err);
}
})
The fs.readFile() reads the PDF file and generates data in raw buffer format.

Now what I want is to convert the 'Blob' data into 'raw buffer' so that I can print the PDF.

[kamaldeepoodles]

In what format "data = buildDocument();" holds data in "jsPDF.js"

[kamaldeepoodles]

Please let me know

[kamaldeepoodles]

                var blob = new Blob([array], {type: "application/pdf"});

                var arrayBuffer, uint8Array;
                var fileReader = new FileReader();
                fileReader.onload = function() {
                    arrayBuffer = this.result;
                    uint8Array  = new Uint8Array(arrayBuffer);

                    var printer = require("./js/controller/lib");
                    printer.printDirect({
                        data: uint8Array,
                        printer:'Deskjet_3540',
                        type: 'PDF',
                        success: function(id) {
                            console.log('printed with id ' + id);
                        },
                        error: function(err) {
                            console.error('error on printing: ' + err);
                        }
                    })
                };
                fileReader.readAsArrayBuffer(blob);

This is the final code which worked for me. The printer accepts uint8Array encoding format.