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Tres Finocchiaro edited this page Apr 26, 2021 · 2 revisions

Compatibility

  • ✅ 2.0 | ⛔ 1.9 | ...

Deprecation Notice

⚠️ This API is deprecated. Please use the 2.1 API here with the latest qz-tray.js, which is fully backwards compatible with the 2.0 version.

Contents

The following code can be used for raw printing only. If you are unsure what raw printing is, please refer to What is Raw Printing?

  • Note: Some Windows drivers, such as Zebra's ZDesigner driver for Microsoft Windows, will support raw printing alongside pixel-based/PostScript printing. You may use those drivers or a raw-generic/text-only driver to send raw commands, but the generic driver will not be able to print images/PDF/HTML.

Prerequisites

Languages

Language Aliases

Techniques

Advanced

Generic

Boilerplate code to send raw commands to any printer. See also ZPL, EPL, ESC/POS for specific examples. If your raw language is missing, please contact support.

Note: Reminder to supply <meta content="text/html;charset=utf-8" http-equiv="Content-Type"> if printing Unicode.

var config = qz.configs.create("Printer Name");

var data = [
   'Raw Data\n',
   'More Raw Data\n',
   'Even More Raw Data\n'
];

qz.print(config, data).catch(function(e) { console.error(e); });

Note: The raw commands provided may not work with your printer. Please reference your printer's programming guide for more information.

  • Albeit obvious, each example needs a trigger, such as a button, .e.g.
<input type="button" onclick="printStuff()" value="Print"></input>

ZPL

Example for sending raw ZPL commands to a printer

Note: language: "foo" is only required if providing a raw image type in the data stream. Note: Labels are too small? Try this experimental code to force a 203dpi label to 300dpi.

var config = qz.configs.create("Printer Name");

var data = [
   '^XA\n',
   '^FO50,50^ADN,36,20^FDPRINTED USING QZ TRAY PLUGIN\n',
   { 
     type: 'raw', format: 'image', data: 'assets/img/image_sample_bw.png', 
     options: { language: "ZPL" } 
   }, 
   '^FS\n',
   '^XZ\n'
];

qz.print(config, data).catch(function(e) { console.error(e); });
}

EPL

Example for sending EPL commands to a printer.

Note: language: "foo" is only required if providing a raw image type in the data stream.

var config = qz.configs.create("Printer Name");
   
var data = [
   '\nN\n',
   { type: 'raw', format: 'image', data: 'assets/img/image_sample_bw.png', options: { language: "EPL", x: 20, y: 0 } },
   '\nP1,1\n'
];

qz.print(config, data).catch(function(e) { console.error(e); });
}

ESC/POS

var config = qz.configs.create("Printer Name");

var data = [
   { type: 'raw', format: 'image', data: 'assets/img/image_sample_bw.png', options: { language: "ESCPOS", dotDensity: 'double' } },
   '\x1B' + '\x40',          // init
   '\x1B' + '\x61' + '\x31', // center align
   'Beverly Hills, CA  90210' + '\x0A',
   '\x0A',                   // line break
   'www.qz.io' + '\x0A',     // text and line break
   '\x0A',                   // line break
   '\x0A',                   // line break
   'May 18, 2016 10:30 AM' + '\x0A',
   '\x0A',                   // line break
   '\x0A',                   // line break    
   '\x0A',
   'Transaction # 123456 Register: 3' + '\x0A',
   '\x0A',
   '\x0A',
   '\x0A',
   '\x1B' + '\x61' + '\x30', // left align
   'Baklava (Qty 4)       9.00' + '\x1B' + '\x74' + '\x13' + '\xAA', //print special char symbol after numeric
   '\x0A',
   'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX' + '\x0A',       
   '\x1B' + '\x45' + '\x0D', // bold on
   'Here\'s some bold text!',
   '\x0A',
   '\x1B' + '\x45' + '\x0A', // bold off
   '\x1D' + '\x21' + '\x11', // double font size
   'Here\'s large text!',
   '\x0A',
   '\x1D' + '\x21' + '\x00', // standard font size
   '\x1B' + '\x61' + '\x32', // right align
   '\x1B' + '\x21' + '\x30', // em mode on
   'DRINK ME',
   '\x1B' + '\x21' + '\x0A' + '\x1B' + '\x45' + '\x0A', // em mode off
   '\x0A' + '\x0A',
   '\x1B' + '\x61' + '\x30', // left align
   '------------------------------------------' + '\x0A',
   '\x1B' + '\x4D' + '\x31', // small text
   'EAT ME' + '\x0A',
   '\x1B' + '\x4D' + '\x30', // normal text
   '------------------------------------------' + '\x0A',
   'normal text',
   '\x1B' + '\x61' + '\x30', // left align
   '\x0A' + '\x0A' + '\x0A' + '\x0A' + '\x0A' + '\x0A' + '\x0A',
   '\x1B' + '\x69',          // cut paper (old syntax)
// '\x1D' + '\x56'  + '\x00' // full cut (new syntax)
// '\x1D' + '\x56'  + '\x30' // full cut (new syntax)
// '\x1D' + '\x56'  + '\x01' // partial cut (new syntax)
// '\x1D' + '\x56'  + '\x31' // partial cut (new syntax)
   '\x10' + '\x14' + '\x01' + '\x00' + '\x05',  // Generate Pulse to kick-out cash drawer**
                                                // **for legacy drawer cable CD-005A.  Research before using.
                                                // see also http://keyhut.com/popopen4.htm
];

qz.print(config, data).catch(function(e) { console.error(e); });

ESC/POS Barcode

//barcode data
var code = '12345';

//convenience method
var chr = function(n) { return String.fromCharCode(n); };

var barcode = '\x1D' + 'h' + chr(80) +   //barcode height
    '\x1D' + 'f' + chr(0) +              //font for printed number
    '\x1D' + 'k' + chr(69) + chr(code.length) + code + chr(0); //code39

qz.websocket.connect().then(function() {
   var config = qz.configs.create("Epson TM88V");
   return qz.print(config, ['\n\n\n\n\n' + barcode + '\n\n\n\n\n']);
}).catch(function(err) { alert(err); });

ESC/POS QR Code

⚠️ Important: The default UTF8 encoding can corrupt QR codes, 'ISO-8859-1' is recommended instead. See #484, #155 for details. Also, if using macOS or Linux, { altPrinting : true } may be required, see #415 for details.

var config = qz.configs.create("Epson TM88V", { encoding: 'ISO-8859-1' });

// The QR data
var qr = 'https://qz.io';

// The dot size of the QR code
var dots = '\x09';

// Some proprietary size calculation
var qrLength = qr.length + 3;
var size1 =  String.fromCharCode(qrLength % 256);
var size0 = String.fromCharCode(Math.floor(qrLength / 256));
        
var data = [ 
   '\x1B' + '\x40' + 'John Doe' +'\x0A' + '\x0A' + '\x0A' + '\x0A' + '\x0A' + '\x0A', // Some text and a few line feeds to make sure the initiation and first line are coming through

   // <!-- BEGIN QR DATA -->
   '\x1D' + '\x28' + '\x6B' + '\x04' + '\x00' + '\x31' + '\x41' + '\x32' + '\x00',    // <Function 165> select the model (model 2 is widely supported)
   '\x1D' + '\x28' + '\x6B' + '\x03' + '\x00' + '\x31' + '\x43' + dots,               // <Function 167> set the size of the module
   '\x1D' + '\x28' + '\x6B' + '\x03' + '\x00' + '\x31' + '\x45' + '\x30',             // <Function 169> select level of error correction (48,49,50,51) printer-dependent
   '\x1D' + '\x28' + '\x6B' + size1 + size0 + '\x31' + '\x50' + '\x30' + qr,          // <Function 080> send your data (testing 123) to the image storage area in the printer
   '\x1D' + '\x28' + '\x6B' + '\x03' + '\x00' + '\x31' + '\x51' +'\x30',              // <Function 081> print the symbol data in the symbol storage area
   '\x1D' + '\x28' + '\x6B' + '\x03' + '\x00' + '\x31' + '\x52' +'\x30',              // <Function 082> Transmit the size information of the symbol data in the symbol storage area
   // <!-- END QR DATA -->

   'New York, NY' + '\x0A' + '\x0A' + '\x0A' + '\x0A' + '\x0A' + '\x0A'               // more line feeds and text to see if we messed up the QR Code syntax      
];

Evolis

Evolis Image

Example for sending 648 x 1016 pixels of graphic data to an Evolis printer. Take special note of precision: 128, which is 128 color precision (the highest) and overlay: true which will use the clear overlay film after printing as a light protective coating.

This technique can be combined with magnetic encoding and text printing.

var config = qz.configs.create('Evolis');

var data = [
   '\x1BPps;0\x0D',   // Enable raw/disable driver printer parameter supervision
   '\x1BPwr;0\x0D',   // Landscape (zero degree) orientation
   '\x1BWcb;k;0\x0D', // Clear card memory
   '\x1BSs\x0D',      // Start of sequence
   { type: 'raw', format: 'image', data: 'assets/img/fade-test.png', options: { language: "EVOLIS", precision: 128, overlay: true } }
   '\x1BSe\x0D'       // End of sequence
];

qz.print(config, data).catch(function(err) { alert(err); });

Evolis Overlay

If available, the overlay is a light protective coating that is applied by clear film of the print ribbon. In special cases, such as dual-sided printing, the overlay may need to be finely controlled (e.g. avoiding the magnetic stripe on the back side of the card). Take special note of overlay: overlay in code example.

Overlay can be the path to an image (black pixels will print as overlay) or can be a series of coordinates.

var config = qz.configs.create('Evolis');

// Technique 1 - Use rectangles to draw overlay

// Supplied rectangle will print as overlay
// Typical mag-stripe provided as example
var overlay = [
   [0, 0, 439, 1016],
   [588, 0, 648, 1016]
   // or if rotated 180 degrees
   // [0, 0, 60, 1016],
   // [209, 0, 648, 1016]
];

// Technique 2 - Use black pixels in 648 x 1016 image to draw overlay

// Black pixels will print as overlay
// var overlay = 'path/to/overlay.png';

var data = [
   '\x1BPps;0\x0D',   // Enable raw/disable driver printer parameter supervision
   '\x1BPwr;0\x0D',   // Landscape (zero degree) orientation
   '\x1BWcb;k;0\x0D', // Clear card memory
   '\x1BSs\x0D',      // Start of sequence

   // Overlay provided with image command
   { type: 'raw', format: 'image', data: 'assets/img/fade-test.png', options: { language: "EVOLIS", precision: 128, overlay: overlay } },
   '\x1BSe\x0D'       // End of sequence
];

qz.print(config, data).catch(function(err) { alert(err); });

Evolis Text

Draws the given monochrome text at the specified coordinates and font style.

Note: If combining with image printing, this should generally come after the image commands.

var config = qz.configs.create('Evolis');

var data = [
   // Wt = Monochrome text in bitmap
   // 50 = X Position
   // 60 = Y Position
   // 0  = Font Type.  0 = Arial Normal 100 dots, 1 = Arial Bold 100 dots
   // <text>
   '\x1B' + 'Wt;50;60;0;30;Printed using QZ Tray' + '\x0D',
   '\x1BSe\x0D'       // End of sequence
];

qz.print(config, data).catch(function(err) { alert(err); });

Evolis Magnetic Stripe

Magnetic stripe encoding is available through the Ss and Dm;<track>;<data> commands. This technique can be combined with image printing and text printing

var config = qz.configs.create('Evolis');

// Magnetic Encoding example
var data = [
   '\x1BPps;0\x0D',                    // Enable raw/disable driver printer parameter supervision
   '\x1BWcb;k;0\x0D',                  // Clear card memory
   '\x1BSs\x0D',                       // Start of sequence

    // Download magnetic track data using ISO 7811
   '\x1B' + 'Pps;0' + '\x0D',          // Enable raw/disable driver printer parameter supervision
// '\x1B' + 'Pmc;h' + '\x0D',          // Enable high coercivity
// '\x1B' + 'Pmc;l' + '\x0D',          // Enable low coercivity
   '\x1B' + 'Ss' + '\x0D'              // Start recording and clear the current magnetic buffer
   '\x1B' + 'Dm;1;foo' + '\x0D',       // Track 1 = Alpha (ASCII Range 20 - 95) Len: 79 (including start/stop/lrc)
   '\x1B' + 'Dm;2;12345' + '\x0D',     // Track 2 = Numeric, Len 40 (including start/stop/lrc)
   '\x1B' + 'Dm;3;67890' + '\x0D',     // Track 3 = Numeric, Len 107 (including start/stop/lrc)
   '\x1B' + 'Smw' + '\x0D'             // Write the magnetic data aka "Sequence write magnetic track"

   '\x1BSe\x0D'                        // End of sequence
];

qz.print(config, data).catch(function(err) { alert(err); });

Evolis Manual Flip

Manual card flipping is done by telling the printer where to insert and where to output the card using Pcim and Pcem commands respectively. Remember when printing overlay ribbon to a magnetic strip or chip area to use the evolis overlay mask area.

var config = qz.configs.create('Evolis');

// Manual flip example
var data = [

   // Front side
   '\x1BPcim;F\x0D'   // F Position: Feeder insertion
   '\x1BPcem;M\x0D'   // M Position: Manual ejection
   '\x1BSs\x0D',      // Start of sequence
// ... etc
   '\x1BSe\x0D'       // End of sequence

   // Back side
   '\x1BPcim;M\x0D',  // M Position: Manual insertion
   '\x1BPcem;D\x0D',  // D Position: Default ejection(output hopper)
   '\x1BSs\x0D',      // Start of sequence
// ... etc
   '\x1BSe\x0D'       // End of sequence

];

qz.print(config, data).catch(function(err) { alert(err); });

DPL

//barcode data
var code = '1234567890';

var text = 'Hello world';

//convenience method
var chr = function(n) { return String.fromCharCode(n); };

var data = [
   chr(02) + 'n\n',
   ' M0500\n',
   ' KcLW0422;\n',
   ' O0220\n',
   ' d\n',
   ' L\n',
   'D11\n',
   'ySPM\n',
   'A2\n',
   '1911A1200650118' + text +'\n',
   '1eA505401290091C' + code + '\n',
   '1911A1201090155'+ code + '\n',
   'Q0001\n',
   'E\n'
];

qz.websocket.connect().then(function() {
   var config = qz.configs.create("I-Class Mark II");
   return qz.print(config, data);
}).catch(function(err) { console.error(err); });

Base64

With this function, you can send base64 encoded characters/raw commands to qz using "base64". This will automatically convert provided base64 encoded text into text/ascii/bytes, etc.

function printBase64() {
   var config = qz.configs.create("Printer Name");

   var data = [
      {
         type: 'raw',
         format: 'base64',
         data: 'Ck4KcTYwOQpRMjAzLDI2CkI1LDI2LDAsMUEsMyw3LDE1MixCLCIxMjM0IgpBMzEwLDI2LDAsMywx' +
            'LDEsTiwiU0tVIDAwMDAwIE1GRyAwMDAwIgpBMzEwLDU2LDAsMywxLDEsTiwiUVogUFJJTlQgQVBQ' +
            'TEVUIgpBMzEwLDg2LDAsMywxLDEsTiwiVEVTVCBQUklOVCBTVUNDRVNTRlVMIgpBMzEwLDExNiww'
      }
   ];

   qz.print(config, data).catch(function(e) { console.error(e); });
}

Base64 Images

Since 2.0.3, you can send base64 encoded images to qz. This will automatically convert provided base64 encoded image data into a supported raw image type. Base64 image data must begin with data:image/png;base64,.

function printBase64Image() {
   var config = qz.configs.create("Printer Name");

   var data = [
      {
         type: 'raw',
         format: 'image',
         data: 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAMAAAAoLQ9TAAAAJFBMVEX' +
               '///8kIiQAAADMzMyZmZlmZmb8/vxcXlz//8z//5lmzAAzZgBFSkm0AAAAVklEQVQYlYWPUQ6AMAhD' +
               'ATvZ5v3va6duYybG90P60gQQ+cBuZs47KVG4exA/BVXLbRZT1ZZle1YYQMM8UVBEgKWBRdR6UKRXg' +
               '5kCAx7QrkidK48/+7MnGPwCSdhQpuEAAAAASUVORK5CYII=',
         options: { language: "ESCPOS", dotDensity: 'double' }
      }
   ];

   qz.print(config, data).catch(function(e) { console.error(e); });
}

File

This feature allows a raw file to be spooled directly to the printer.

function printFile() {
   var config = qz.configs.create("Printer Name");

   var data = [
      {
         type: 'raw', 
         format: 'file', 
         data: 'assets/raw-data.txt'
      }
   ];
  
   qz.print(config, data).catch(function(e) { console.error(e); });
}

XML

The ability to read the contents of an XML file containing Base64 encoded commands and send these commands to the printer.

function printXML() {
   var config = qz.configs.create("Printer Name");

   var data = [
      {
         type: 'raw', 
         format: 'xml', 
         data: 'assets/zpl_sample.xml', 
         options: { xmlTag: 'v7:Image' }
      }
   ];

   qz.print(config, data).catch(function(e) { console.error(e); });
}

URL

Print directly to a HTTP url (such as a CUPS shared printer, or to a print server device).

function printToURL() {
   var config = qz.configs.create({ host: "192.168.254.254", port: 9100 }); // or http://<cups-server>/printers/<my-printer>

   var data = [
      'Raw Data\n',
      'More Raw Data\n',
      'Even More Raw Data\n'
   ];

   qz.print(config, data).catch(function(e) { console.error(e); });
}

Filesystem

Print to local filesystem

function printToFile() {
   var config = qz.configs.create({ file: "/path/to/output.txt" }); // or "C:\\path\\to\\output.text", etc

   var data = [
      'Raw Data\n',
      'More Raw Data\n',
      'Even More Raw Data\n'
   ];

   qz.print(config, data).catch(function(e) { console.error(e); });
}

Print to Win32 UNC Path

function printToUNC() {
   var config = qz.configs.create({ file: "\\\\server\\printer" });

   var data = [
      'Raw Data\n',
      'More Raw Data\n',
      'Even More Raw Data\n'
   ];

   qz.print(config, data).catch(function(e) { console.error(e); });
}

Print to Win32 Device Namespace

Leverage printing API for writing to a Win32 Device Namespace physical device such as a Bematech/Logic Controls Pole Display mapped as \\.\LCLD9

function printToDevice() {
   var config = qz.configs.create({ file: "\\\\.\\LCLD9\\dummy" });

   var data = [
      '"\r\nMMM... COFFEE! :)\r\n"'
   ];

   qz.print(config, data).catch(function(e) { console.error(e); });
}

Advanced Print Spooling

Spools jobs between specified endOfDoc delimiter. Useful for avoiding buffer overflows on unusually large quantity print jobs by spooling each raw job individually. Defaults to 1 job per spool, but can be overridden using perSpool option.

function advancedSpooling() {
   var config = qz.configs.create("Printer Name", { endOfDoc : '\n' });

   var data = [
      'First\n',
      'Second\n',
      'Third\n'
   ];

   qz.print(config, data).catch(function(e) { console.error(e); });
}

Special Characters

Hex

function printHex() {
   var config = qz.configs.create("Printer Name");

   var data = [
      { type: 'raw', format: 'hex', data: 'x1Bx00' } // or data: '1B00'
   ];

   qz.print(config, data).catch(function(e) { console.error(e); });
}

Decimal

function printDecimal() {
   var config = qz.configs.create("Printer Name");

   var data = [
      String.fromCharCode(27) + String.fromCharCode(0) // e.g. CHR(27) CHR(0) or Hex x1Bx00
   ];

   qz.print(config, data).catch(function(e) { console.error(e); });
}

Right To Left

Some languages such as Arabic are right-to-left and not interpreted properly by raw printers. Although Java can render these languages properly, not all printers are capable of rendering RTL correctly. The workaround is to reverse the text so that it renders properly.

function rightToLeft() {
   var config = qz.configs.create("Printer Name");

   var data = [
      'Lorem: ',
      '	الرياض'.split('').reverse().join(''), // reverse Arabic text for certain printer models
      'Ipsum. '
   ];

   qz.print(config, data).catch(function(e) { console.error(e); });
}

Note: The split('') method can corrupt data. For a more comprehensive reverse solution, see esrever project.

Code Page

Force Java to use a specific code-page for printing.

function printCodePage() {
   var config = qz.configs.create("Printer Name", { encoding: 'Cp1253' }); // MS-DOS Greek

   var data = [
      "Σ β θ"
   ];

   qz.print(config, data).catch(function(e) { console.error(e); });
}

Combining Techniques

function printCombined() {
   var config = qz.configs.create("Printer Name");

   // Example only, not valid ESC/POS
   var data = [
      "My Raw Commands",
      String.fromCharCode(27) + String.fromCharCode(0),
      { type: 'raw', format: 'hex', data: 'x1Bx00' },
      { type: 'raw', format: 'image', data: 'assets/img/image_sample_bw.png',
         options: { language: "ESCPOS", dotDensity: 'double' }
      }, 
   ];

   qz.print(config, data).catch(function(e) { console.error(e); });
}

Copies

A config parameter copies can be provided to send the specified raw commands multiple times. This is a convenience function as most raw languages already have an internal copies/quantity command.

function copies() {
var config = qz.configs.create("Printer Name", { copies: 4 });

var data = [
   'Raw Data\n',
   'More Raw Data\n',
   'Even More Raw Data\n'
];

qz.print(config, data).catch(function(e) { console.error(e); });
}

Custom Job Name

A config parameter jobName can be provided to change the name listed in the print queue.

function customJobName() {
var config = qz.configs.create("Printer Name", { jobName: "Receipt #123456" });

var data = [
   'Raw Data\n',
   'More Raw Data\n',
   'Even More Raw Data\n'
];

qz.print(config, data).catch(function(e) { console.error(e); });
}

Alternate Printing

When using CUPS (Linux/Unix/Mac), the printer driver can be bypassed completely by executing a command-line option

lpr -o raw my-raw-file.txt

This may be useful when troubleshooting issues with non-raw printer drivers. QZ Tray can substitute the standard printing behavior with this technique by adding a config parameter altPrinting. This parameter has no effect in a Windows environment.

var config = qz.configs.create("Printer Name", { altPrinting: true });

var data = [
   'Raw Data\n',
   'More Raw Data\n',
   'Even More Raw Data\n'
];

qz.print(config, data).catch(function(e) { console.error(e); });

Chaining Requests

Print requests can be chained together to print several raw items at once, or to print to several different printers.

var config = qz.configs.create();
var data = [{ type: 'raw', data: null, }];

data.data = 'Some Raw Data #1';                    ////// First raw item
config.setPrinter('First Printer');                ////// First printer
qz.print(config, data)

.then(function() {
   data.data = 'Some Raw Data #2';                 ////// Second raw item
   config.setPrinter('Second Printer');            ////// First printer
   return qz.print(config, data);
})

.then(function() {
   data.data = 'Some Raw Data #3';                 ////// Third raw item
   config.setPrinter('Third Printer');             ////// Third printer
   return qz.print(config, data);
})

.catch(function(e) {
   console.error(e);                // Exceptions throw all the way up the stack
});

Promise Loop

Using a Promise Loop, we can defer items (printers, data)

  • So that different chunks of data can be sent to different printers
  • So that an arbitrary (non-fixed) amount of data can be sent to a printer
function promiseLoop() {
    var data = [
        "^XA\n^FO50,50^ADN,36,20^FDPRINT 1 ^FS\n^XZ\n",
        "^XA\n^FO50,50^ADN,36,20^FDPRINT 2 ^FS\n^XZ\n",
        "^XA\n^FO50,50^ADN,36,20^FDPRINT 3 ^FS\n^XZ\n",
        "^XA\n^FO50,50^ADN,36,20^FDPRINT 4 ^FS\n^XZ\n"
    ];
    var configs = [
        { "printer": "ZDesigner LP2844-Z" },
        { "printer": "ZDesigner LP2844-Z" },
        { "printer": "ZDesigner LP2844-Z" },
        { "printer": "ZDesigner LP2844-Z" }
    ];
    var chain = [];

    for(var i = 0; i < data.length; i++) {
        (function(i_) {
            //setup this chain link
            var link = function() {
                return qz.printers.find(configs[i_].printer).then(function(found) {
                    return qz.print(qz.configs.create(found), [data[i_]]);
                });
            };

            chain.push(link);
        })(i);
        //closure ensures this promise's concept of `i` doesn't change
    }
	
    //can be .connect or `Promise.resolve()`, etc
    var firstLink = new RSVP.Promise(function(r, e) { r(); });

    var lastLink = null;
    chain.reduce(function(sequence, link) {
        lastLink = sequence.then(link);
        return lastLink;
    }, firstLink);

    //this will be the very last link in the chain
    lastLink.catch(function(err) {
        console.error(err);
    });
}

Large Files

Since 2.0.3, you can use a new DIRECT option for larger raw files. Large raw files may result in large spikes in memory consumption. Use DIRECT to reduce memory consumption by bypassing some of the internal String handling procedures.

Note: This CANNOT be combined with features like Advanced Print Spooling, raw images.

var config = qz.configs.create("Printer Name");
var data = [{
   type: 'direct',
   format: 'file',
   data: 'path/to/large_file.txt'
}];

qz.print(config, data).catch(function(e) { console.error(e); });
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