Printing Service

This is a printing service class serving following functions

• Discover IPP Printers in the local network
• Get Printer via IPP Protocols
• Get Printer's Supported Job Attributes
• Send and Print JPEG
• Check Print Job (with Job ID)

Installing Printing Service

npm install --save c15yo-printing

// Using require()
const Printer = require('c15yo-printing')

Library usage

Create an instance of the Printer class.

// ES2015 modules
const Printer = require('c15yo-printing')
const printer = new Printer();

By initializing an instance of Printer, a mDNS discovery service will start searching and detects updates from the network.

Printer Discovery

Since printer discovery service is started since Printer instance is created. This feature queries the list of printer and returns necessary information.

getPrinters()

Return Value

{
    // Printer
    "10.0.0.254": {
        "status": "OK", // Printer query status, "OK" or "ERROR"
        "mdns": [MDNS Object], // mDNS query result in Object format
        "printer": [IPPPrinter Object], // If status is "OK", this object will be populated. Printer full attributes information in Object format
        "error": [Error] // If status is "ERROR", this object will be populated.
    },
    ... // More printers
}

MDNS Object

mDNS Object from local network discovery

{
    "addresses": [Array(String)], // Array of address
    "query": [Array(String)], // Array of MDNS queries
    "type": [Array(Object)], // Array of MDNS responses and supported protocols
    ... // Unnecessary items
}

IPP Printer Object

IPP Printer Object

{
    "version": "2.0", // IPP Protocol Version
    "statusCode": "successful-ok", // IPP Query status
    "id": 24255051, // IPP Query ID
    "operation-attributes-tag": [Object], // Printer operational configuration tags
    "printer-attributes-tag": [Object], // Printer operational attributes
}

Example

var printers = printer.getPrinters()

getPrinter(ip)

Argument: ip

Type: string

IP Address of the printer. This ip address must be from discovered printer list or null will be returned.

Return Value

{
    "status": "OK", // Printer query status, "OK" or "ERROR"
    "mdns": [MDNS Object], // mDNS query result in Object format
    "printer": [IPPPrinter Object], // If status is "OK", this object will be populated. Printer full attributes information in Object format
    "error": [Error] // If status is "ERROR", this object will be populated.
}

getPrinterAttributes(ip, callback)

Argument: ip

Type: string

IP Address of the printer.

Argument: callback

Type: function(error, result)

Arguments: error: If no error occured, this object will be undefined. Otherwise, an Error object will be returned. result: If no error occured, this object will be populated with an IPP Printer Object

Printer Operation

printJPEG(ip, buffer, meta, callback)

Send a JPEG print job to the printer

Argument: ip

Type: string

IP Address of the printer.

Argument: buffer

Type: JavaScript Buffer <buffer> | String

JPEG Buffer. e.g. fs.readFileSync('something.jpg')

Argument: meta

Type: Object

Example

{
    "job-attributes-tag": [Object], // Print job attributes. e.g. Copies, Quality, etc.
}

Argument: callback

Type: function(error, result)

Arguments: error: If no error occured, this object will be undefined. Otherwise, an Error object will be returned. result:

{
    "status": "OK", // "OK" or "ERROR"
    "data": [Object] | String, // If status is "OK", an IPP Job Object will be populated here. 
                                // If there is an error, this field will be an error message.
    "job": String // If status is "OK", a base64 encoded print job uri will be populated here.
}

getJobAttributes(ip, uri, callback)

Get processing, completed or cancelled print job details by the job id.

Argument: ip

Type: string

IP Address of the printer.

Argument: uri

Type: string

Job URI. (By decoding the base64 job id. see printJPEG=>callback.

Argument: callback

Type: function(error, result)

Arguments: error: If no error occured, this object will be undefined. Otherwise, an Error object will be returned. result:

{
    "status": "OK", // "OK" or "ERROR"
    "job": [Object] // If status is "OK", job object will be populated here.
}