node-screenshots v0.2.0

📸 node-screenshots

node-screenshots is a native node.js screenshot library based on XCap, It supports Mac, Windows, and Linux systems without any dependencies. node-screenshots supports screenshot and video recording (to be implemented).

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Support Matrix

Operating System

Example

Monitor

const fs = require("fs");
const { Monitor } = require("node-screenshots");

let monitor = Monitor.fromPoint(100, 100);

console.log(monitor, monitor.id);

let image = monitor.captureImageSync();
fs.writeFileSync(`${monitor.id}-sync.png`, image.toPngSync());

monitor.captureImage().then((data) => {
  console.log(data);
  fs.writeFileSync(`${monitor.id}.jpeg`, data.toJpegSync());
});

let monitors = Monitor.all();

monitors.forEach((capturer) => {
  console.log({
    id: capturer.id,
    x: capturer.x,
    y: capturer.y,
    width: capturer.width,
    height: capturer.height,
    rotation: capturer.rotation,
    scaleFactor: capturer.scaleFactor,
    isPrimary: capturer.isPrimary,
  });
});

Window

const fs = require("fs");
const { Window } = require("node-screenshots");

let windows = Window.all();

windows.forEach((item) => {
  console.log({
    id: item.id,
    x: item.x,
    y: item.y,
    width: item.width,
    height: item.height,
    rotation: item.rotation,
    scaleFactor: item.scaleFactor,
    isPrimary: item.isPrimary,
  });

  let image = item.captureImageSync();
  fs.writeFileSync(`${item.id}-sync.bmp`, image.toBmpSync());

  item.captureImage().then(async (data) => {
    console.log(data);
    let newImage = await data.crop(10, 10, 10, 10);
    fs.writeFileSync(`${item.id}.png`, await newImage.toPng());
  });
});

API

Full typeScript type definition: index.d.ts

Monitor

• static all(): Array<Monitor>: Get all monitor
• static fromPoint(x: number, y: number): Monitor | null: Get a monitor from the specified coordinates
• captureImageSync(): Image: Synchronously capture image
• captureImage(): Promise<Image>: Asynchronously capture image

Window

• static all(): Array<Window>: Get all window
• captureImageSync(): Image: Synchronously capture image
• captureImage(): Promise<Image>: Asynchronously capture image

Image

• cropSync(x: number, y: number, width: number, height: number): Image: Synchronously crop image
• crop(x: number, y: number, width: number, height: number): Promise<Image>: Asynchronously crop image
• toPngSync(copyOutputData?: boolean | undefined | null): Buffer:Synchronously Convert to png
• toPng(copyOutputData?: boolean | undefined | null): Promise<Buffer>: Asynchronously Convert to png
• toJpegSync(copyOutputData?: boolean | undefined | null): Buffer: Synchronously Convert to jpeg
• toJpeg(copyOutputData?: boolean | undefined | null): Promise<Buffer>: Asynchronously Convert to jpeg
• toBmpSync(copyOutputData?: boolean | undefined | null): Buffer: Synchronously Convert to bmp
• toBmp(copyOutputData?: boolean | undefined | null): Promise<Buffer>: Asynchronously Convert to bmp
• toRawSync(copyOutputData?: boolean | undefined | null): Buffer: Synchronously Convert to raw(RGBA data)
• toRaw(copyOutputData?: boolean | undefined | null): Promise<Buffer>: Asynchronously Convert to raw(RGBA data)

copyOutputData: pass related parameters in electron, otherwise electron will crash, nodejs does not pass or passes false, performance will be better, for more information refer to https://github.com/napi-rs/napi-rs/issues/1346

Linux System Requirements

On Linux, you need to install libxcb, libxrandr, and dbus.

Debian / Ubuntu:

apt-get install libxcb1 libxrandr2 libdbus-1-3

Alpine:

apk add libxcb libxrandr dbus