using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;

namespace CentralControl
{
   public class HttpCli
    {


        /// <summary>
        /// 指定Url地址使用Get 方式获取全部字符串
        /// </summary>
        /// <param name="url">请求链接地址</param>
        /// <returns></returns>
        public static string Get(string url)
        {
            string result = "";
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
            Stream stream = resp.GetResponseStream();
            try
            {
                //获取内容
                using (StreamReader reader = new StreamReader(stream))
                {
                    result = reader.ReadToEnd();
                }
            }
            finally
            {
                stream.Close();
            }
            return result;
        }
        
        public static void GetFile(string url,string path)
        {
            WebRequest request = WebRequest.Create(url);
            WebResponse response = request.GetResponse();
            if (response.ContentType.ToLower().Length > 0)
            {
                using (Stream reader = response.GetResponseStream())
                {
                    using (FileStream writer = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write))
                    {
                        byte[] buffer = new byte[1024];
                        int c = 0;
                        while ((c = reader.Read(buffer, 0, buffer.Length)) > 0)
                        {
                            writer.Write(buffer, 0, c);
                        }
                    }
                }
                //HttpContext
            }
        }

        public static byte[] GetFile_Bytes(string url)
        {
            byte[] bytesAll = null;
            WebRequest request = WebRequest.Create(url);
            WebResponse response = request.GetResponse();
            if (response.ContentType.ToLower().Length > 0)
            {
                using (Stream reader = response.GetResponseStream())
                {
                    MemoryStream ms = new MemoryStream();
                    byte[] buffer = new byte[1024];
                    while (true)
                    {
                        int sz = reader.Read(buffer, 0, 1024);
                        if (sz == 0) break;
                        ms.Write(buffer, 0, sz);
                    }
                    bytesAll = ms.ToArray();
                }
            }
           
            //如是图片
            //System.Drawing.Image img = System.Drawing.Image.FromStream(ms);

            return bytesAll;

        }



   



    public void FGHJ()
        {

            // Create a 'WebRequest' object with the specified url. 
            WebRequest myWebRequest = WebRequest.Create("http://www.contoso.com");

            // Send the 'WebRequest' and wait for response.
            WebResponse myWebResponse = myWebRequest.GetResponse();

            // Obtain a 'Stream' object associated with the response object.
            Stream ReceiveStream = myWebResponse.GetResponseStream();

            Encoding encode = System.Text.Encoding.GetEncoding("utf-8");

            // Pipe the stream to a higher level stream reader with the required encoding format. 
            StreamReader readStream = new StreamReader(ReceiveStream, encode);
            Console.WriteLine("\nResponse stream received");
            Char[] read = new Char[256];

            // Read 256 charcters at a time.    
            int count = readStream.Read(read, 0, 256);
            Console.WriteLine("HTML...\r\n");

            while (count > 0)
            {
                // Dump the 256 characters on a string and display the string onto the console.
                String str = new String(read, 0, count);
                Console.Write(str);
                count = readStream.Read(read, 0, 256);
            }

            Console.WriteLine("");
            // Release the resources of stream object.
            readStream.Close();

            // Release the resources of response object.
            myWebResponse.Close();
 
        }

        /// <summary>
        /// 发送Get请求
        /// </summary>
        /// <param name="url">地址</param>
        /// <param name="dic">请求参数定义</param>
        /// <returns></returns>
        public static string Get(string url, Dictionary<string, string> dic)
        {
            string result = "";
            StringBuilder builder = new StringBuilder();
            builder.Append(url);
            if (dic.Count > 0)
            {
                builder.Append("?");
                int i = 0;
                foreach (var item in dic)
                {
                    if (i > 0)
                        builder.Append("&");
                    builder.AppendFormat("{0}={1}", item.Key, item.Value);
                    i++;
                }
            }
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(builder.ToString());
            //添加参数
            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
            Stream stream = resp.GetResponseStream();
            try
            {
                //获取内容
                using (StreamReader reader = new StreamReader(stream))
                {
                    result = reader.ReadToEnd();
                }
            }
            finally
            {
                stream.Close();
            }
            return result;
        }



        /// <summary>
        /// 指定Post地址使用Get 方式获取全部字符串
        /// </summary>
        /// <param name="url">请求后台地址</param>
        /// <returns></returns>
        public static string Post(string url)
        {
            string result = "";
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            req.Method = "POST";
            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
            Stream stream = resp.GetResponseStream();
            //获取内容
            using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
            {
                result = reader.ReadToEnd();
            }
            return result;
        }



        /// <summary>
        /// 指定Post地址使用Get 方式获取全部字符串
        /// </summary>
        /// <param name="url">请求后台地址</param>
        /// <returns></returns>
        public static string Post(string url, Dictionary<string, string> dic)
        {
            string result = "";
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            req.Method = "POST";
            req.ContentType = "application/x-www-form-urlencoded";
            #region 添加Post 参数
            StringBuilder builder = new StringBuilder();
            int i = 0;
            foreach (var item in dic)
            {
                if (i > 0)
                    builder.Append("&");
                builder.AppendFormat("{0}={1}", item.Key, item.Value);
                i++;
            }
            byte[] data = Encoding.UTF8.GetBytes(builder.ToString());
            req.ContentLength = data.Length;
            using (Stream reqStream = req.GetRequestStream())
            {
                reqStream.Write(data, 0, data.Length);
                reqStream.Close();
            }
            #endregion
            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
            Stream stream = resp.GetResponseStream();
            //获取响应内容
            using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
            {
                result = reader.ReadToEnd();
            }
            return result;
        }


        /// <summary>
        /// 指定Post地址使用Get 方式获取全部字符串
        /// </summary>
        /// <param name="url">请求后台地址</param>
        /// <param name="content">Post提交数据内容(utf-8编码的)</param>
        /// <returns></returns>
        public static string Post(string url, string content)
        {
            string result = "";
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            req.Headers.Add("token", "factory2"); //如果接口需要鉴权, 把"token"换成自己需要的
            req.Method = "POST";
            req.ContentType = "application/json";

            #region 添加Post 参数
            byte[] data = Encoding.UTF8.GetBytes(content);
            req.ContentLength = data.Length;
            using (Stream reqStream = req.GetRequestStream())
            {
                reqStream.Write(data, 0, data.Length);
                reqStream.Close();
            }
            #endregion

            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
            Stream stream = resp.GetResponseStream();
            //获取响应内容
            using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
            {
                result = reader.ReadToEnd();
            }
            return result;
        }




        /// <summary>
        /// Http下载文件
        /// </summary>
        /// <param name="uri">下载地址</param>
        /// <param name="filefullpath">存放完整路径（含文件名）</param>
        /// <param name="size">每次多的大小</param>
        /// <returns>下载操作是否成功</returns>

        public static bool DownLoadFiles(string uri, string filefullpath, int size = 1000000)
        {
            try
            {
                if (File.Exists(filefullpath))
                {
                    try
                    {
                        File.Delete(filefullpath);
                    }
                    catch (Exception ex)
                    {
                        return false;
                    }
                }

                string fileDirectory = System.IO.Path.GetDirectoryName(filefullpath);

                if (!Directory.Exists(fileDirectory))
                {
                    Directory.CreateDirectory(fileDirectory);
                }

                FileStream fs = new FileStream(filefullpath, FileMode.Create);

                byte[] buffer = new byte[size];

                HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);

                request.Timeout = 100000;

                request.AddRange((int)fs.Length);

                Stream ns = request.GetResponse().GetResponseStream();

                long contentLength = request.GetResponse().ContentLength;

                int length = ns.Read(buffer, 0, buffer.Length);

                while (length > 0)
                {
                    fs.Write(buffer,0 , length);
                    buffer = new byte[size];
                    length = ns.Read(buffer, 0, buffer.Length);
                }

                fs.Close();

                return true;
            }
            catch (Exception ex)
            {
                return false;
            }

        }


    


    }
}