printer-example.js

printer-example.js

// https://github.com/song940/node-escpos
var path = require('path');
var express = require('express');
var app = express();
var http = require('http').Server(app);
var io = require('socket.io')(http);

var escpos = require('escpos');

process.on('uncaughtException', function (err) {
  console.error(err);
  console.log("Node NOT Exiting...");
});

try {
  var device  = new escpos.USB();
  var printer = new escpos.Printer(device);
} catch(e) {
  console.log(e);
}

app.use(express.static(path.join(__dirname, 'public')));

io.on('connection', function(socket){
  socket.on('print', function(data){
    print(data);
  });

  // forward all messages to clients
  socket.on('message', function(data){
    socket.broadcast.emit('message', data);
  }); 
  socket.on('line', function(data){
    socket.broadcast.emit('line', data);
  });
});
    
http.listen(3000, function(){
  console.log('listening on *:3000');
});

function print(data) {
  if (printer) {
    escpos.Image.load(__dirname + '/cocktail3.png', function(image){
      device.open(function(){

        printer.font('a');
        printer.size(1, 1);
        printer.align('CT');
        printer.text('24h HOST');
        printer.text('\n');

        printer.image(image, 'd24');
        printer.text('\n');

        // .image(image, 's8')
        // .image(image, 'd8')
        // .image(image, 's24')
        //.raster(image)
        // .raster(image, 'dw')
        // .raster(image, 'dh')
        // .raster(image, 'dwdh')


        printer.align('LT');
        if (data) {
          printer.text(data);
        }
        printer.text('\n\n')
        printer.cut();
        printer.close();
        
      });

    });
  }
}