golang Screenshot

Screenshot.go

package main

import (
	"context"
	"io/ioutil"
	"log"
	"time"

	"github.com/chromedp/chromedp"
)

func main() {
	// Create a new context
	ctx, cancel := chromedp.NewContext(context.Background())
	defer cancel()

	// Navigate to the desired URL
	err := chromedp.Run(ctx, chromedp.Navigate("https://erp.sjau.ac.ir/Hermes"))
	if err != nil {
		log.Fatal(err)
	}

	// Wait for the page to load
	time.Sleep(10 * time.Second)
	/*
		var width int64
		err = chromedp.Run(ctx,
			chromedp.Evaluate(`window.innerWidth`, &width),
		)
		if err != nil {
			log.Fatal(err)
		}

		var size int64
		err = chromedp.Run(ctx, chromedp.Evaluate(`document.body.scrollHeight`, &size))
		if err != nil {
			log.Fatal(err)
		}
		fmt.Println(width)
		fmt.Println(size)
	*/

	// Set the viewport size to the dimensions of the loaded page
	err = chromedp.Run(ctx, chromedp.EmulateViewport(1500, 1300))
	if err != nil {
		log.Fatal(err)
	}

	// Capture a screenshot of the entire page
	var buf []byte
	err = chromedp.Run(ctx, chromedp.FullScreenshot(&buf, 100))
	if err != nil {
		log.Fatal(err)
	}

	// Save the screenshot to a file
	err = ioutil.WriteFile("screenshot.png", buf, 0644)
	if err != nil {
		log.Fatal(err)
	}

	log.Println("Screenshot captured and saved to screenshot.png")
}