C#爬虫selenium webdriver使用火狐浏览器截取全屏并转成pdf_selenium 火狐获得网页长宽-优快云博客

本文链接：https://blog.youkuaiyun.com/huling314/article/details/118378912

本文介绍了使用C#和Selenium WebDriver如何操作火狐浏览器进行全屏截图，并将截图转换为PDF。由于WebDriver默认最大截取宽度限制，需要对长页面进行裁剪拼接。截屏前确保所有内容已加载，并注意滚动条位置，防止异常。通过itextsharp库将PNG图片插入PDF，但由于每页图片大小限制，可能需要拆分后再插入。

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对于网页页面很长的，使用webdriver自带的方法进行截屏时，默认的最大截取宽度是16384，超过最大宽度就要对页面进行裁剪拼接

public Bitmap GetFullScreenshot()
        {
   
   

            Bitmap stitchedImage = null;
            try
            {
   
   
                long totalwidth1 = (long)((IJavaScriptExecutor)this.webDriver).ExecuteScript("return document.body.offsetWidth");//documentElement.scrollWidth");

                long totalHeight1 = (long)((IJavaScriptExecutor)this.webDriver).ExecuteScript("return  document.body.parentNode.scrollHeight");

                int totalWidth = (int)totalwidth1;
                int totalHeight = (int)totalHeight1;

                // Get the Size of the Viewport
                long viewportWidth1 = (long)((IJavaScriptExecutor)this.webDriver).ExecuteScript("return document.body.clientWidth");//documentElement.scrollWidth");
                long viewportHeight1 = (long)((IJavaScriptExecutor)this.webDriver).ExecuteScript("return window.innerHeight");//documentElement.scrollWidth");

                int viewportWidth = (int)viewportWidth1;
                int viewportHeight = (int)viewportHeight1;


                // Split the Screen in multiple Rectangles
                List<Rectangle> rectangles = new List<Rectangle>();
                // Loop until the Total Height is reached
                for (int i = 0; i < totalHeight; i += viewportHeight)
                {
   
   
                    int newHeight = viewportHeight;
                    // Fix if the Height of the Element is too big
                    if (i + viewportHeight > totalHeight)
                    {
   
   
                        newHeight = totalHeight - i;
                    }
                    // Loop until the Total Width is reached
                    for (int ii = 0; ii < totalWidth; ii += viewportWidth)
                    {
   
   
                        int newWidth = viewportWidth;
                        // Fix if the Width of the Element is too big
                        if (ii + viewportWidth > totalWidth)
                        {
   
   
                            newWidth = totalWidth - ii;
                        }

                        // Create and add the Rectangle
                        Rectangle currRect = new Rectangle(ii, i, newWidth, newHeight);
                        rectangles.Add(currRect);
                    }
                }

                // Build the Image
                stitchedImage = new Bitmap(totalWidth, totalHeight);
                // Get all Screenshots and stitch them together
                Rectangle previous = Rectangle.Empty;
                foreach (var rectangle in rectangles)
                {
   
   
                    // Calculate the Scrolling (if needed)
                    if (previous != Rectangle.Empty)
                    {
   
   
                        int xDiff = rectangle.Right - previous.Right;
                        int yDiff = rectangle.<