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  • c#WebBrowser进阶

    WebBrowser的基本功能就是访问网页,但是由于它本身就不在主线程上面,所以程序判断它什么时候加载完成了,比较麻烦。为此我集合从网上找到的内容,做了一个例子。

    其中包括了给WebBrowser设置cookies,点击WebBrowser中的button等功能。

      [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
      public static extern bool InternetSetCookie(string lpszUrlName, string lbszCookieName, string lpszCookieData)
      private delegate void invokeDelegate();
      public void bk()
           {
                         
                string url = "http://*******"//任意网址
                //添加cookies
                for (int i = 0; i < cookies.Count; i++)
                {
                    Cookie c = cookies[i];
                    InternetSetCookie(url, c.Name, c.Value);
                }
                webBrowser2.Navigate(url);
    
                webBrowser2.ScriptErrorsSuppressed = true;
                while (true)
                {
                    Application.DoEvents();
                    if (webBrowser2.ReadyState != WebBrowserReadyState.Complete)
                    {
                        break;
                    }
                }
    
            
                invokeDelegate del = new invokeDelegate(StartMethod);
    
                IAsyncResult ir = del.BeginInvoke(AddComplete, null);
    
            }    
      /// <summary>
      /// 委托异步
      /// </summary>
      /// <param name="result"></param>
      private void AddComplete(IAsyncResult result)
        {
            invokeDelegate handler = (invokeDelegate)((AsyncResult)result).AsyncDelegate;
            handler.EndInvoke(result);
        }
    

      

     上面的代码是在webBrowser2中加载网页,使用了委托异步的方法。

     private void StartMethod()
       {
               
                Thread.Sleep(7000);
            
                this.Invoke(new Action(() =>
                {
                    HtmlDocument cd = webBrowser2.Document;
                    string doc = webBrowser2.DocumentText;           
                    int count = 0;
                    HtmlElementCollection dhl1 = cd.GetElementsByTagName("input");//GetElementsByTagName得到的是点击的标记元素名称
    
                    foreach (HtmlElement item in dhl1)
                    {
                        string elemName = item.GetAttribute("name");
    
                        if (elemName != null || elemName.Length > 0)
                        {
                            if (elemName == "btnclick")
                            {
                                item.InvokeMember("click");
                            }                    
    
                        }
                    }
    
                }));
         
             
            }
    

      开始加入Thread.Sleep(7000);是为了给webBrowser2加载页面的时间,7s足够页面加载完成。然后在获取页面的内容,并找到btnclick进行点击。

    最后贴出从txt中获取cookies的方法:

     public static CookieCollection getCookies(string path)
            {
                string cook = ReadTxt(path).Trim();
    
                CookieCollection cookies = new CookieCollection();
                string[] cookstr = cook.Split(';');
                foreach (string str in cookstr)
                {
                    string[] cookieNameValue = str.Split('=');
                    cookieNameValue[1] = cookieNameValue[1].Trim().ToString().Replace(",", "%2C");
                    Cookie ck = new Cookie(cookieNameValue[0].Trim().ToString(), cookieNameValue[1].Trim().ToString());
                    ck.Domain = "*******";//Host地址,可从浏览器上查看
                    cookies.Add(ck);
    
                }
                return cookies;
            }
    

      这样就可以实现自动加载某个网页并点击页面上的按钮了。

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  • 原文地址:https://www.cnblogs.com/paidaxing/p/4597565.html
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