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   源码介绍

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Net;
using System.Text;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Windows.Forms;


namespace OcrTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        TestCookie sc = new TestCookie();

        private void button1_Click(object sender, EventArgs e)
        {
            pictureBox1.Image = doGetImg("http://laishangdai.com/Member/common/verify?t=0.7488636498533732", sc);
        }


        private void button2_Click(object sender, EventArgs e)
        {
            string poststr = "sUserName="   textBox1.Text.Trim()   "&sPassword="   textBox2.Text.Trim()   "&sVerCode="   textBox3.Text.Trim()   "&Keep=0";
            byte[] data = System.Text.Encoding.UTF8.GetBytes(poststr);
            textBox4.Text = doPost("http://laishangdai.com/Member/common/actlogin/", data, sc, "utf-8", "http://laishangdai.com/member/common/login/");
        }

        public static string doPost(string Url, byte[] postData, TestCookie bCookie, String encodingFormat, String referer)
        {
            try
            {
                HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(Url.ToString());
                myRequest.CookieContainer = bCookie.mycookie;
                myRequest.Method = "POST";
                myRequest.Timeout = 30000;
                myRequest.KeepAlive = true;
                if (referer != "")
                    myRequest.Referer = referer;
                myRequest.Headers["Cache-control"] = "no-cache";
                myRequest.Headers["Accept-Language"] = "zh-cn";
                myRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; Trident/4.0; GTB7.4; GTB7.1; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; InfoPath.2)";
                myRequest.ContentType = "application/x-www-form-urlencoded";
                myRequest.Accept = "*/*";
                myRequest.ContentLength = postData.Length;
                Stream newStream = myRequest.GetRequestStream();
                newStream.Write(postData, 0, postData.Length);
                newStream.Close();
                HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
                bCookie.upcookie(myResponse.Cookies);
                StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.GetEncoding(encodingFormat));
                string outdata = reader.ReadToEnd();
                reader.Close();
                if (!outdata.Contains("基础连接已经关闭: 连接被意外关闭") && !outdata.Contains("无法连接到远程服务器") && !outdata.Contains("基础连接已经关闭: 接收时发生错误。"))
                    return outdata;
                else
                    return "基础连接已经关闭: 连接被意外关闭";
            }
            catch (Exception ex)
            {
                if (!ex.Message.Contains("基础连接已经关闭: 连接被意外关闭") && !ex.Message.Contains("无法连接到远程服务器") && !ex.Message.Contains("基础连接已经关闭: 接收时发生错误。"))
                    return ex.Message;
                else
                    return "基础连接已经关闭: 连接被意外关闭";
            }

        }
        public static Image doGetImg(string Url, TestCookie bCookie)
        {
            try
            {
                HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(Url.ToString());
                myRequest.ServicePoint.Expect100Continue = true;
                myRequest.CookieContainer = bCookie.mycookie;
                myRequest.Method = "GET";
                myRequest.Timeout = 30000;
                myRequest.KeepAlive = true;//modify by yang
                myRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0)";
                myRequest.ContentType = "application/x-www-form-urlencoded";
                HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
                bCookie.upcookie(myResponse.Cookies);

                return Bitmap.FromStream(myResponse.GetResponseStream());
            }
            catch
            {
                return null;
            }
        }

        public class TestCookie
        {
            public CookieContainer mycookie = new CookieContainer();//定义cookie容器
            public Object obj = new Object();
            public byte[] byt = new byte[1];
            public void upcookie(CookieCollection cookie)
            {
                for (int i = 0; i < cookie.Count; i  )
                {
                    mycookie.Add(cookie[i]);
                }
                obj = mycookie;
                byt = ObjectToBytes(obj);
            }
            /**/
            /// <summary>
            /// 将一个object对象序列化，返回一个byte[]
            /// </summary>
            /// <param name="obj">能序列化的对象</param>
            /// <returns></returns>
            public static byte[] ObjectToBytes(object obj)
            {
                using (MemoryStream ms = new MemoryStream())
                {
                    IFormatter formatter = new BinaryFormatter();
                    formatter.Serialize(ms, obj);
                    return ms.GetBuffer();
                }
            }

            /**/
            /// <summary>
            /// 将一个序列化后的byte[]数组还原
            /// </summary>
            /// <param name="Bytes"></param>
            /// <returns></returns>
            public object BytesToObject(byte[] Bytes)
            {
                using (MemoryStream ms = new MemoryStream(Bytes))
                {
                    IFormatter formatter = new BinaryFormatter();
                    return formatter.Deserialize(ms);
                }
            }
            public CookieContainer getcookie()
            {
                return mycookie;
            }
        }

    }

}