selenium - 如何使用 Selenium WebDriver 截取部分截图（帧）？

Question

是否可以在框架集中仅使用一帧（不是完整窗口）的 WebDriver 截取屏幕截图？

或者，是否可以为屏幕截图定义窗口坐标或随后裁剪图像？

Answer 1

这应该有效：

import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;

import org.openqa.selenium.By;
import org.openqa.selenium.OutputType;
import org.openqa.selenium.Point;
import org.openqa.selenium.TakesScreenshot;
import org.openqa.selenium.WebDriver;

public class Shooter{

    private WebDriver driver;

    public void shootWebElement(WebElement element) throws IOException  {

        File screen = ((TakesScreenshot) this.driver).getScreenshotAs(OutputType.FILE);

        Point p = element.getLocation();

        int width = element.getSize().getWidth();
        int height = element.getSize().getHeight();

        BufferedImage img = ImageIO.read(screen);

        BufferedImage dest = img.getSubimage(p.getX(), p.getY(), width,   
                                 height);

        ImageIO.write(dest, "png", screen);

        File f = new File("S:\\ome\\where\\over\\the\\rainbow");

        FileUtils.copyFile(screen, f);

    }
}

Answer 2

Python 解决方案（依赖：PIL 或 Pillow）：

from PIL import Image
from selenium import webdriver

def element_screenshot(driver, element, filename):
    bounding_box = (
        element.location['x'], # left
        element.location['y'], # upper
        (element.location['x'] + element.size['width']), # right
        (element.location['y'] + element.size['height']) # bottom
    )
    return bounding_box_screenshot(driver, bounding_box, filename)

def bounding_box_screenshot(driver, bounding_box, filename):
    driver.save_screenshot(filename)
    base_image = Image.open(filename)
    cropped_image = base_image.crop(bounding_box)
    base_image = base_image.resize(cropped_image.size)
    base_image.paste(cropped_image, (0, 0))
    base_image.save(filename)
    return base_image

if __name__ == '__main__':
    driver = webdriver.Firefox()
    driver.get('https://www.google.com/?gws_rd=ssl')
    element = driver.find_element_by_id('body')

    screenshot = element_screenshot(driver, element, 'element.png') # Screenshot the '#body' element

    bounding_box = (100, 100, 600, 600)
    screenshot = bounding_box_screenshot(driver, bounding_box, 'box.png') # Screenshot the bounding box (100, 100, 600, 600)

Answer 3

红宝石解决方案

设置

安装 xvfb

apt-get install xvfb -y

安装无头浏览器和图像处理 gem

gem install chunky_png
gem install headless
gem install selenium-webdriver

安装chrome驱动

wget http://chromedriver.googlecode.com/files/chromedriver_linux64_<latest>.zip
apt-get install unzip
unzip chromedriver_linux64_<latest>.zip
cp chromedriver /usr/local/bin

更多信息 可以在这里找到

代码

#!/usr/bin/env ruby

require "headless"
require "selenium-webdriver"
require 'chunky_png'

headless = Headless.new
headless.start

site = "?_some_site_?"

driver = Selenium::WebDriver.for :chrome
driver.navigate.to site
sleep 1
driver.save_screenshot('screenshot.png')

el= driver.find_element(:xpath, '?_some_xpath_?')

image = ChunkyPNG::Image.from_file('screenshot.png')

image.crop!(el.location.x + 1, el.location.y + 1, el.size.width, el.size.height)
image.save('croped.png')

driver.quit
headless.destroy

Answer 4

只需发布一个基于 C# 的解决方案，在 selenium 中获取特定 Html 元素的屏幕截图：

首先，我们需要使用 Selenium Web 驱动程序的 GetScreenShot 方法截取整个网页的屏幕截图，如下所示。

Screenshot screenshot = ((ITakesScreenshot)this.driver).GetScreenshot(); 
screenshot.SaveAsFile(filename, System.Drawing.Imaging.ImageFormat.Jpeg);

然后从指定 html 元素的位置、高度和宽度创建一个矩形。（这必须使用FindElement()selenium 的方法通过提供 id 或类名来获得）。

Image img = Bitmap.FromFile(uniqueName);
Rectangle rect = new Rectangle();

if (element != null)
{
    // Get the Width and Height of the WebElement using
    int width = element.Size.Width;
    int height = element.Size.Height;

    // Get the Location of WebElement in a Point.
    // This will provide X & Y co-ordinates of the WebElement
    Point p = element.Location;

    // Create a rectangle using Width, Height and element location
    rect = new Rectangle(p.X, p.Y, width, height);
}

使用这个我们将裁剪截图如下，结果将是截图特定的网络元素。

Bitmap bmpImage = new Bitmap(img);
var cropedImag = bmpImage.Clone(rect, bmpImage.PixelFormat);

完整代码作为以下方法：

/// <summary>
/// Captures the element screen shot.
/// </summary>
/// <param name="element">The element.</param>
/// <param name="uniqueName">Name of the unique.</param>
/// <returns>returns the screenshot  image </returns>
public Image CaptureElementScreenShot(HTMLElement element, string uniqueName)
{
    Screenshot screenshot = ((ITakesScreenshot)this.driver).GetScreenshot();
    screenshot.SaveAsFile(filename, System.Drawing.Imaging.ImageFormat.Jpeg);

    Image img = Bitmap.FromFile(uniqueName);
    Rectangle rect = new Rectangle();

    if (element != null)
    {
        // Get the Width and Height of the WebElement using
        int width = element.Size.Width;
        int height = element.Size.Height;

        // Get the Location of WebElement in a Point.
        // This will provide X & Y co-ordinates of the WebElement
        Point p = element.Location;

        // Create a rectangle using Width, Height and element location
        rect = new Rectangle(p.X, p.Y, width, height);
    }

    // croping the image based on rect.
    Bitmap bmpImage = new Bitmap(img);
    var cropedImag = bmpImage.Clone(rect, bmpImage.PixelFormat);

    return cropedImag;
}

Answer 5

斯卡拉解决方案：

import javax.imageio.ImageIO
import java.awt.image.BufferedImage

// phone is a case class with witdth and height Int fields

def producer {       
 [..]
 processScreenshot(driver.getScreenshotAs(OutputType.FILE), ph)
}

def processScreenshot(file: File, phone: Phone) = {
 val img: BufferedImage = ImageIO.read(file)
 val w = math.min(img.getWidth, phone.width)
 val h = math.min(img.getHeight, phone.height)
 val dest = img.getSubimage(0, 0, w, h)
 ImageIO.write(dest, "png", new File(s"/tmp/${un}_${phone.file}.png"))
}