找到网页的某一区域，截图，并保存 HTML to Image

python 实现

http://www.jianshu.com/p/7ed519854be7 

利用 Python + Selenium 实现对页面的指定元素截图(可截长图元素)

http://codingpy.com/article/take-screenshot-of-web-page-using-selenium/

利用 Python + Selenium 自动化快速截图

from PIL import Image
from selenium import webdriver
import time;  # 引入time模块


def webscreen(i):
    print(i)
    if i == 1 or i == 700:
        print(time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()))
    # url = 'http://192.168.20.58/gfwd/comments-1.html'
    url = 'http://192.168.20.58/gfwd/comments-' + str(i) + '.html'
    # driver = webdriver.Chrome("C:/Users/maimai/Downloads/chromedriver_win32/chromedriver.exe")
    # driver = webdriver.PhantomJS("‪D:/迅雷下载/phantomjs-2.1.1-windows/bin/phantomjs.exe")
    driver = webdriver.PhantomJS(r"D:迅雷下载phantomjs-2.1.1-windowsinphantomjs.exe")
    # ‪D:迅雷下载phantomjs-2.1.1-windowsinphantomjs.exe
    driver.set_page_load_timeout(300)
    driver.set_window_size(1280, 800)
    driver.get(url)

    imgelement = driver.find_element_by_id('screen')
    location = imgelement.location
    size = imgelement.size
    savepath = r'images/codingpy_' + str(i) + '.png'
    driver.save_screenshot(savepath)
    im = Image.open(savepath)
    left = location['x']
    top = location['y']
    right = left + size['width']
    bottom = location['y'] + size['height']
    im = im.crop((left, top, right, bottom))
    im.save(savepath)

 c#实现

 static void Main(string[] args)
        {
            var url = "http://192.168.20.58/gfwd/comments-1.html";
            using (var driver = new PhantomJSDriver(@"E:seleniumphantomjs-2.1.1-windowsin"))
            {
                //进入百度首页
                driver.Navigate().GoToUrl(url);
                driver.Manage().Window.Size = new Size(1280, 800);

                //设置窗体最大化
                //driver.Manage().Window.Maximize();
                //找到对象
                var imgelement = driver.FindElementById("screen");
                var location = imgelement.Location;
                var size = imgelement.Size;

                var savepath = Environment.CurrentDirectory + "\codingpy_1.png";
                driver.GetScreenshot().SaveAsFile(savepath, ScreenshotImageFormat.Png);//屏幕截图   
                Image image = System.Drawing.Image.FromFile(savepath);
                int left = location.X;
                int top = location.Y;
                int right = left + size.Width;
                int bottom = top + size.Height;
                //截图
                Bitmap bitmap = new Bitmap(savepath);//原图
                Bitmap destBitmap = new Bitmap(size.Width, size.Height);//目标图
                Rectangle destRect = new Rectangle(0, 0, size.Width, size.Height);//矩形容器
                Rectangle srcRect = new Rectangle(left, top, size.Width, size.Height);
                Graphics graphics = Graphics.FromImage(destBitmap);
                graphics.DrawImage(bitmap, destRect, srcRect, GraphicsUnit.Pixel);
                destBitmap.Save("d:\aa.Png");
                graphics.Dispose();
            }
        }

参考链接 C#对图片文件的压缩、裁剪操作初探 http://www.cnblogs.com/xyang/archive/2013/02/25/2932145.html

            

自动化测试：Selenium webdriver 学习笔记-C#版（二）

http://seleniumhq.github.io/selenium/docs/api/dotnet/index.html api文档