通过CefSharp实现浏览器自动输入自动点击按钮等

      本程序基于CefSharp实现自动打开一个网站，自动输入账号密码自动注册。然后跳转到商品页自动输入评论的内容然后提交。完全模拟人为在浏览器的所有操作，包括自动输入，自动点击等操作。

      本解决方案可以应用于网络爬虫，刷单，刷评论，参与自动秒杀活动。抢票程序等等。

      最终效果如下：

cefsharp是一个在c#中使用Chrome浏览器内核实现浏览器功能的插件，类似于c#中的WebBrowser功能。

主要代码：

1、引用

<wpf:ChromiumWebBrowser x:Name="webBrowser" Address="https://www.walmart.com/account/login"/>

2、执行JavaScript

public async void EvaluateJavaScript(string s, bool addCommonJs = false)
        {
            try
            {
                if (addCommonJs)
                {
                    s = commonJs + s;
                }
                var response = await webBrowser.EvaluateScriptAsync(s);
                if (response.Success && response.Result is IJavascriptCallback)
                {
                    response = await ((IJavascriptCallback)response.Result).ExecuteAsync("This is a callback from EvaluateJavaScript");
                }

                var EvaluateJavaScriptResult = response.Success ? (response.Result ?? "null") : response.Message;
            }
            catch (Exception e)
            {
                MessageBox.Show("Error while evaluating Javascript: " + e.Message, "Error", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }

　3、设置cookie

public static void SetCefCookies(string url, CookieCollection cookies)
        {
            //Cef.GetGlobalCookieManager().SetStoragePath(Environment.CurrentDirectory, true);
            foreach (System.Net.Cookie c in cookies)
            {
                var cookie = new CefSharp.Cookie
                {
                    Creation = DateTime.Now,
                    Domain = c.Domain,
                    Name = c.Name,
                    Value = c.Value,
                    Expires = c.Expires
                };
                Task<bool> task = Cef.GetGlobalCookieManager().SetCookieAsync(url, cookie);
                while (!task.IsCompleted)
                {
                    continue;
                }
                bool b = task.Result;
            }
        }

　　4、获取当前页面的html源码

private string GetHTMLFromWebBrowser()
        {
            // call the ViewSource method which will open up notepad and display the html. 
            // this is just so I can compare it to the html returned in GetSourceAsync() 
            // This is displaying all the html code (including child frames) 
            //webBrowser.GetBrowser().MainFrame.ViewSource();

            // Get the html source code from the main Frame. 
            // This is displaying only code in the main frame and not any child frames of it. 
            Task<String> taskHtml = webBrowser.GetBrowser().MainFrame.GetSourceAsync();

            string response = taskHtml.Result;
            return response;
        }

　　5、拦截json请求结果

 public class DefaultResourceHandler : ResourceRequestHandler
    {
        public event EventHandler<JsonResponseHandlerEventArgs> json_response_handler;
        private Dictionary<ulong, MemoryStreamResponseFilter> responseDictionary = new Dictionary<ulong, MemoryStreamResponseFilter>();
        public DefaultResourceHandler() { }
        public DefaultResourceHandler(EventHandler<JsonResponseHandlerEventArgs> json_response_handler) {
            this.json_response_handler = json_response_handler;
        }
        protected override IResponseFilter GetResourceResponseFilter(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IResponse response)
        {
            if (response.MimeType.Equals("application/json", StringComparison.OrdinalIgnoreCase)
                || (response.Headers["Content-Type"] != null && response.Headers["Content-Type"].ToLower().Contains("application/json")))
            {
                return JsonResponseFilter.CreateFilter(request.Identifier.ToString());
            }
            return null;
        }
        
        protected override void OnResourceLoadComplete(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IResponse response, UrlRequestStatus status, long receivedContentLength)
        {
            var filter = JsonResponseFilter.GetFileter(request.Identifier.ToString()) as JsonResponseFilter;
            if (filter != null)
            {
                var encode = !string.IsNullOrEmpty(response.Charset)
                    ? Encoding.GetEncoding(response.Charset)
                    : Encoding.UTF8;
                using (var read = new StreamReader(filter.GetStream(), encode))
                {
                    //获取到的json内容
                    var text = read.ReadToEnd();
                    json_response_handler?.Invoke(response, new JsonResponseHandlerEventArgs(request, response, text));
                    Trace.WriteLine(response.MimeType + "=>" + request.Url + "::" + text);
                }
            }
        }
    }