using System;

using System.Net;

using System.IO;

using System.Text;

namespace Common

{

    /// <summary>

    /// 下载远程图片保存到本地地址

    /// </summary>

    public class DowloadWXImg

    {

        /// <summary>

        /// 下载图片

        /// </summary>

        /// <param name="picUrl">图片Http地址</param>

        /// <param name="savePath">保存路径</param>

        /// <param name="timeOut">Request最大请求时间，如果为-1则无限制</param>

        /// <returns></returns>

        public static bool DownloadPicture(string picUrl, string savePath, int timeOut=-1)

        {

            bool value = false;

            WebResponse response = null;

            Stream stream = null;

            try

            {

                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(picUrl);

                if (timeOut != -1) request.Timeout = timeOut;

                response = request.GetResponse();

                stream = response.GetResponseStream();

                if (!response.ContentType.ToLower().StartsWith("text/"))

                    value = SaveBinaryFile(response, savePath);

            }

            catch (Exception e) {

                LogHelper.AddErrorLog("下载远程图片失败:"+e.ToString());

            }

            finally

            {

                if (stream != null) stream.Close();

                if (response != null) response.Close();

            }

            return value;

        }

        private static bool SaveBinaryFile(WebResponse response, string savePath)

        {

            bool value = false;

            byte[] buffer = new byte[1024];

            Stream outStream = null;

            Stream inStream = null;

            try

            {

                if (File.Exists(savePath)) File.Delete(savePath);

                outStream = System.IO.File.Create(savePath);

                inStream = response.GetResponseStream();

                int l;

                do

                {

                    l = inStream.Read(buffer, 0, buffer.Length);

                    if (l > 0) outStream.Write(buffer, 0, l);

                } while (l > 0);

                value = true;

            }

            finally

            {

                if (outStream != null) outStream.Close();

                if (inStream != null) inStream.Close();

            }

            return value;

        }

    }

}

string img = "/Img/CustomerHeadImg/" + OrgID;

             //string SavaWxImage = Server.MapPath(img); //该方法是获取网站所在的根目录
　　　　　　　　　　//

//System.AppDomain.CurrentDomain.BaseDirectory 这个方法 是获取网站下面的应用程序目录

                string SavaWxImage = System.AppDomain.CurrentDomain.BaseDirectory+img;

      　　   if (!Directory.Exists(SavaWxImage))//是否存在文件夹,没存在则创建

                    Directory.CreateDirectory(SavaWxImage);

                bool isWXImg = DowloadWXImg.DownloadPicture(wxImage, SavaWxImage+"/" + unionid + ".jpg");