/// <summary>
    /// uploadFiles 的摘要說明
    /// </summary>
    public class uploadFiles : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
            context.Response.Write("Hello World");
            UploadFile(context);
        }

        
 
public bool IsReusable
        {
            get
            {
                return false;
            }
        }
        public void UploadFile(HttpContext context)
        {
            context.Response.CacheControl = "no-cache";
            string s_rpath = FileHelper.GetUploadPath();//@"E:\My Documents\Visual Studio 2008\WebSites\SWFUpload\demos\applicationdemo.net";
 



            string Datedir = DateTime.Now.ToString("yy-MM-dd");
            string updir = s_rpath + "\\" + Datedir;
            string extname = string.Empty;
            string fullname = string.Empty;
            string filename = string.Empty;
            if (context.Request.Files.Count > 0
 
)
            {
                try
                {

                    for (int j = 0; j < context.Request.Files.Count; j++)
                    {
                        
                        HttpPostedFile uploadFile = context.Request.Files[j];
                        int offset =Convert.ToInt32( context.Request["chunk"]); //當前分塊
                        int total =Convert.ToInt32(context.Request["chunks"]);//總的分塊數量
                        string name = context.Request["name"];
                        //檔案沒有分塊
                        if (total == 1)
                        {

                            if (uploadFile.ContentLength > 0)
                            {
                                if (!Directory.Exists(updir))
                                {
                                    Directory.CreateDirectory(updir);
                                }
                                 extname = Path.GetExtension(uploadFile.FileName);
                                 fullname = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString();
                                 filename = uploadFile.FileName;

                                uploadFile.SaveAs(string.Format("{0}\\{1}", updir, filename));
                            }
                        }
                        else
                        {
                            //檔案 分成多塊上傳
                            fullname = WriteTempFile(uploadFile, offset);
                            if (total-offset==1)
                            {
                                //如果是最後一個分塊檔案 ，則把檔案從臨時資料夾中移到上傳檔案 夾中
                                System.IO.FileInfo fi = new System.IO.FileInfo(fullname);
                                string oldFullName = string.Format("{0}\\{1}", updir, uploadFile.FileName);
                                FileInfo oldFi = new FileInfo(oldFullName);
                                if (oldFi.Exists)
                                {
                                    //檔名存在則刪除舊檔案 
                                    oldFi.Delete();
                                }
                                fi.MoveTo(oldFullName);
                            }
                        }
                    }
                }
                catch (Exception ex)
                {
                    context.Response.Write("Message" + ex.ToString());
                }



            }
        }
        /// <summary>
        /// 儲存臨時檔案 
        /// </summary>
        /// <param name="uploadFile"></param>
        /// <param name="chunk"></param>
        /// <returns></returns>
        private string WriteTempFile(HttpPostedFile uploadFile, int chunk)
        {
            
            string tempDir = FileHelper.GetTempPath();
            if (!Directory.Exists(tempDir))
            {
                Directory.CreateDirectory(tempDir);
            }
            string fullName = string.Format("{0}\\{1}.part", tempDir, uploadFile.FileName);
            if (chunk==0)
            {
                //如果是第一個分塊，則直接儲存
                uploadFile.SaveAs(fullName);
            }
            else
            {
                //如果是其他分塊檔案 ，則原來的分塊檔案，讀取流，然後檔案最後寫入相應的位元組
                FileStream fs = new FileStream(fullName, FileMode.Append);
                if (uploadFile.ContentLength>0)
                {
                int       FileLen = uploadFile.ContentLength;
   byte[] input = new byte[FileLen];

   // Initialize the stream.
   System.IO.Stream MyStream = uploadFile.InputStream;

   // Read the file into the byte array.
   MyStream.Read(input, 0, FileLen);

   fs.Write(input,0,FileLen);
   fs.Close();
                }
            }
            

            return fullName;
        }

    }