nw-shot

Create screenshots using nw.js

Install

npm install nw

Usage

var fs = require('fs');
var screenshot = require('nw-shot');

screenshot({
  url : 'http://google.com',
  width : 1024,
  height : 768
}).pipe(fs.createWriteStream('./out.png'));

screenshot(options)

delay

Type: number (milliseconds) Default: 0

Delay between page load and first snapshot, set

evalDelay

Type: number (milliseconds) Default: 0

Delay between last eval and next snapshot

format

Type: string png|jpeg Default: png

Specify the image type fot he screenshot

width

Type: int Default: 0

Specify the with of the browser window

height

Type: int Default: 0

Specify the height of the browser window

eval

Type: string|array<string> Default: undefined

Evaluate JavaScript in browser window context, if supplied as an array of strings, each string will be evaluated and a shot will be taken after each evaluation. The result will stream images seperated by new lines.

Protip: use the line-stream module to group image data into a single buffer that can be streamed in one go.

encoding

Type: string base64|binary Default: 'binary'

app

Type: string Default: 'nw-shot/nw-screeshot'

The path to the NW.js app responsible for capturing screen shots, this allows for ultimate control, see the nw-screenshot folder for an example/boilerplate.

nwPath

Type: string|function Default: [OS dependent - as returned by nw.findPath]

The path to the NW.js binary. As a string nwPath simply holds the path, as a function it must return a string with the path, the function will receive the nw.findPath value which can be mutated and returned accordingly.

Troubleshooting

If you like to use this on travis or with a framebuffer like xvfb than you need to set the environment variable NODESCREENSHOT_SHOW to 1. (export NWSHOT_SHOW). See this .travis.yml for more information