C#如何通过截取网页获得外网IP

[yumanqing]

获得本机的外网IP，代码如下，可是怎么调试都调试不出来，帮忙看看，谢谢了

 private void button1_Click(object sender, EventArgs e)
        {
            textBox2.Text = this.GetOuterIP();
        }
        //----
        public string GetOuterIP()
        {
            string patt = @"IP: \[(?<IP>[0-9\.]*)\]";
            string url = "http://www.baidu.com/";
            string ip = GetPage(url);
            textBox3.Text = ip;
            return Regex.Match(ip, patt).Groups["IP"].Value; 
        }
        //获取网页的HTML内容   
        static string GetPage(string url)
        {
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            try
            {
                using (HttpWebResponse res = (HttpWebResponse)req.GetResponse())
                {
                    using (StreamReader sr = new StreamReader(res.GetResponseStream()))
                    {
                        return sr.ReadToEnd();
                    }
                }
            }
            catch (System.Exception e)
            {
                return e.Message;
            }
            finally
            {
                req.Abort();
            }
        }   

说明：在WINFORM中测试

[yumanqing]

自己UP一下，在线等

[CN_Azure]

//获取外网IP
    public IPAddress GetMyIP()
    {
        //下载数据
        WebClient client = new WebClient();
        byte[] bytRecv = client.DownloadData("http://www.ip138.com/");
        string str = System.Text.Encoding.GetEncoding("gb2312").GetString(bytRecv);
        //提取信息
        string regexStr = @"(?<=您的IP地址是：)[^<]+";
        string myip = Regex.Match(str, regexStr).ToString();
        return IPAddress.Parse(myip);
    }
    //获取本地IP
    public string[] GetMyHomeIp() 
    {
        string homename = Dns.GetHostName();
        IPAddress[] ipa = Dns.GetHostAddresses(homename);
        string[] IPaddrs = new string[ipa.Length];
        for (int i = 0; i < ipa.Length; i++)
        {
            IPaddrs[i] = ipa[i].ToString();
        }
        return IPaddrs;
    }
    //Get
    public void GetIP()
    {
        string homename = Dns.GetHostName();
        IPHostEntry homeIplist = Dns.GetHostByName(homename);
        IPAddress [] IpList = homeIplist.AddressList;
        for (int i = 0; i < IpList.Length; i++)
        {
            Debug.WriteLine(IpList[i].ToString());
            Debug.WriteLine(IpList[i].Address);
            Debug.WriteLine(IpList[i].AddressFamily);
        }
        
    }

[wuyi8808]

http://www.cnblogs.com/skyiv/archive/2005/10/01/GetIP.html

[yumanqing]

还想问下，通过抓取网页获取IP地址，如果网页打不开呢？那不就惨了，有什么好的网页没有，比如百度

[wuyi8808]

[Quote=引用 4 楼 yumanqing 的回复:]
还想问下，通过抓取网页获取IP地址，如果网页打不开呢？那不就惨了，有什么好的网页没有，比如百度
[/Quote]

http://www.123cha.com/

++ 您的ip:[xxx.xx.xx.xxx] 来自: xxx xxx xxx ++

[nixiang12]

路过..貌似有点用...

[zhengzeng]

协议中包含，有相关的方法可以调用的。

[wuyq11]

Uri uri = new Uri("http://www.163.com");
System.Net.HttpWebRequest req = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(uri);
req.Method="POST";
req.ContentType="application/x-www-form-urlencoded";
req.ContentLength =0;
req.CookieContainer=new System.Net.CookieContainer();
req.GetRequestStream().Write(new byte [0], 0, 0);
System.Net.HttpWebResponse res = (System.Net.HttpWebResponse)(req.GetResponse());
StreamReader rs= new StreamReader(res.GetResponseStream(), System.Text.Encoding.GetEncoding(""));
string s= rs.ReadToEnd();
rs.Close();
req.Abort();
res.Close();
System.Text.RegularExpressions.Match m = System.Text.RegularExpressions.Regex.Match(s, @"IP：\[(?<IP>[0-9\.]*)\]");
if (m.Success) return m.Groups["IP"].Value;

[yumanqing]

在UP一下

[暈哥]

 //获取外网IP
        public string getNetIP()
        {
            try
            {
                Uri uri = new Uri("http://www.3322.org/dyndns/getip");//查本机网络IP的网页
                HttpWebRequest req = (HttpWebRequest)WebRequest.Create(uri);
                req.Timeout = 10000;
                req.Method = "POST";
                req.ContentType = "application/x-www-form-urlencoded";
                req.ContentLength = 0;
                req.CookieContainer = new CookieContainer();//伪造cookie
                req.GetRequestStream().Write(new byte[0], 0, 0);
                HttpWebResponse res = (HttpWebResponse)(req.GetResponse());
                StreamReader rs = new StreamReader(res.GetResponseStream(), Encoding.GetEncoding("GB18030"));
                string s = rs.ReadToEnd();
                Match m = Regex.Match(s, @"[0-9\.]*");
                rs.Close();
                res.Close();
                req.Abort();
                if (m.Success)
                    return m.Value;
            }
            catch
            {
                return "获取失败";
            }
            return "获取失败";
        }

http://www.3322.org/dyndns/getip 直接返回你的外网IP

[yumanqing]

楼上的方法是可以取出外网IP，可是两台电脑通过一个路由器上网，怎么取出的外网IP是一样的呢？

[psho78]

俩电脑通过路由器上网，外网IP本来就是同一个的呀

[yumanqing]

[Quote=引用 8 楼 wuyq11 的回复:]
    Uri  uri = new Uri("http://www.163.com");
    System.Net.HttpWebRequest  req = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(uri);
    req.Method="POST";
    req.ContentType="application/x-www-form-urlencoded";
    req.ContentLength =0;
    req.CookieContainer=new System.Net.CookieContainer();
    req.GetRequestStream().Write(new byte [0], 0, 0);
    System.Net.HttpWebResponse res = (System.Net.HttpWebResponse)(req.GetResponse());
    StreamReader rs= new StreamReader(res.GetResponseStream(), System.Text.Encoding.GetEncoding(""));
    string s= rs.ReadToEnd();
    rs.Close();
    req.Abort();
    res.Close();
    System.Text.RegularExpressions.Match m = System.Text.RegularExpressions.Regex.Match(s, @"IP：\[(? <IP>[0-9\.]*)\]");
    if (m.Success) return m.Groups["IP"].Value;

[/Quote]

的方法报错，
System.Net.HttpWebResponse res = (System.Net.HttpWebResponse)(req.GetResponse());
远程服务器返回错误: (405) 不允许的方法。