screenshot

README

screenshot

• Go library to capture desktop screen.
• Multiple display supported.
• Supported GOOS: windows, darwin, linux, freebsd, openbsd, and netbsd.
• cgo free except for GOOS=darwin.

example

• sample program main.go

  package main
  
  import (
  	"github.com/l3aalteshuva/screenshot"
  	"image/png"
  	"os"
  	"fmt"
  )
  
  func main() {
  	n := screenshot.NumActiveDisplays()
  
  	for i := 0; i < n; i++ {
  		bounds := screenshot.GetDisplayBounds(i)
  
  		img, err := screenshot.CaptureRect(bounds)
  		if err != nil {
  			panic(err)
  		}
  		fileName := fmt.Sprintf("%d_%dx%d.png", i, bounds.Dx(), bounds.Dy())
  		file, _ := os.Create(fileName)
  		defer file.Close()
  		png.Encode(file, img)
  
  		fmt.Printf("#%d : %v \"%s\"\n", i, bounds, fileName)
  	}
  }
  

• output example

  $ go run main.go
  #0 : (0,0)-(1280,800) "0_1280x800.png"
  #1 : (-293,-1440)-(2267,0) "1_2560x1440.png"
  #2 : (-1373,-1812)-(-293,108) "2_1080x1920.png"
  $ ls -1
  0_1280x800.png
  1_2560x1440.png
  2_1080x1920.png
  main.go
  

coordinate

Y-axis is downward direction in this library. The origin of coordinate is upper-left corner of main display. This means coordinate system is similar to Windows OS

license

MIT Licence

author

l3aalteshuva

Documentation

Overview

Package screenshot captures screen-shot image as image.RGBA. Mac, Windows, Linux, FreeBSD, OpenBSD and NetBSD are supported.

Index

• func Capture(x, y, width, height int) (*image.RGBA, error)
• func CaptureDisplay(displayIndex int) (*image.RGBA, error)
• func CaptureRect(rect image.Rectangle) (*image.RGBA, error)
• func GetDisplayBounds(displayIndex int) image.Rectangle
• func NumActiveDisplays() int

Functions

func Capture

func Capture(x, y, width, height int) (*image.RGBA, error)

Capture returns screen capture of specified desktop region. x and y represent distance from the upper-left corner of primary display. Y-axis is downward direction. This means coordinates system is similar to Windows OS.

func CaptureDisplay

func CaptureDisplay(displayIndex int) (*image.RGBA, error)

CaptureDisplay captures whole region of displayIndex'th display, starts at 0 for primary display.

func CaptureRect

func CaptureRect(rect image.Rectangle) (*image.RGBA, error)

CaptureRect captures specified region of desktop.

func GetDisplayBounds

func GetDisplayBounds(displayIndex int) image.Rectangle

GetDisplayBounds returns the bounds of displayIndex'th display. The main display is displayIndex = 0.

func NumActiveDisplays

func NumActiveDisplays() int

NumActiveDisplays returns the number of active displays.