.NET 利用PuppeteerSharp生成頁面圖片

安裝 NuGet 程式包 - PuppeteerSharp

Install-Package PuppeteerSharp

創建個控制台程式。

新方法

class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");

            CreateHtmlImg();

            Console.ReadLine();
        }
        static async void CreateHtmlImg()
        {
            //  首次 執行程式 會先下載一個 chrome 程式 ， 下載完成後下次就不用下載。
            await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);

            using (Browser browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = true }))
            {
                using (var page = await browser.NewPageAsync())
                {
                    //設置瀏覽器的頁面大小
                    await page.SetViewportAsync(new ViewPortOptions
                    {
                        Width = 1024,
                        Height = 768
                    });
                    string url = "https://www.cnblogs.com/";
                    await page.GoToAsync(url);

                    // 可執行javasctipt
                    //var seven = await page.EvaluateFunctionAsync<int>("()=> 4 + 3");
                    //var someObject = await page.EvaluateFunctionAsync<dynamic>("(value) => ({a: value})", 5);


                    var html = await page.GetContentAsync();

                    var sourceFile = "";
                    var memoryStream = new MemoryStream(Encoding.Default.GetBytes(html));
                    var sr = new StreamReader(memoryStream);
                    sourceFile = sr.ReadToEnd();

                    //針對源代碼進行分析
                    sr.Close();

                    //將頁面保存為圖片
                    using (var stream = await page.ScreenshotStreamAsync(new ScreenshotOptions { FullPage = false }))
                    {

                        byte[] srcBuf = new Byte[stream.Length];
                        stream.Read(srcBuf, 0, srcBuf.Length);
                        stream.Seek(0, SeekOrigin.Begin);
                        using (FileStream fs = new FileStream(@"D:\垃圾\"+ DateTime.Now.ToString("yyyyMMddHHmmsssss") +".png",FileMode.Create, FileAccess.Write))
                        {
                            fs.Write(srcBuf, 0, srcBuf.Length);
                        }
                    }
                    //將頁面保存為圖片
                    //await page.ScreenshotAsync(@"D:\垃圾\"+ DateTime.Now.ToString("yyyyMMddHHmmsssss") +".png",
                    //new ScreenshotOptions() { FullPage = true, Type = ScreenshotType.Png };
                }
            }
        }
    }

首次執行會比較慢，要下載 Chrome ，330M