.NET 利用PuppeteerSharp生成页面图片

安装 nuget 程序包 – puppeteersharp

install-package puppeteersharp

创建个控制台程序。

 

新方法

class program
    {
        static void main(string[] args)
        {
            console.writeline("hello world!");

            createhtmlimg();

            console.readline();
        }
        static async void createhtmlimg()
        {
            //  首次 执行程序 会先下载一个 chrome 程序 ， 下载完成后下次就不用下载。
            await new browserfetcher().downloadasync(browserfetcher.defaultrevision);

            using (browser browser = await puppeteer.launchasync(new launchoptions { headless = true }))
            {
                using (var page = await browser.newpageasync())
                {
                    //设置浏览器的页面大小
                    await page.setviewportasync(new viewportoptions
                    {
                        width = 1024,
                        height = 768
                    });
                    string url = "https://www.cnblogs.com/";
                    await page.gotoasync(url);

                    // 可执行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();

                    //针对源代码进行分析
                    sr.close();

                    //将页面保存为图片
                    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);
                        }
                    }
                    //将页面保存为图片
                    //await page.screenshotasync(@"d:\垃圾\"+ datetime.now.tostring("yyyymmddhhmmsssss") +".png",
                    //new screenshotoptions() { fullpage = true, type = screenshottype.png };
                }
            }
        }
    }

 

 

 

 

首次执行会比较慢，要下载 chrome ，330m