using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.SessionState;
using Business = SuperMap.RealEstate.HighWay.Storage.Business;

namespace HighWay.WebSite.Handler
{
    /// <summary>
    /// MainFrame 的摘要说明
    /// </summary>
    public class MainFrame_ajax : IHttpHandler, IRequiresSessionState
    {
        public void ProcessRequest(HttpContext context)
        {

            //文件操作
            string action_type = HttpContext.Current.Request.Form["action_type"];
            string action_data = HttpContext.Current.Request.Form["action_data"];
            string RetString = string.Empty;
            SuperMap.RealEstate.ServiceModel.Transaction _Transaction = new SuperMap.RealEstate.ServiceModel.Transaction();
            switch (action_type)
            {
                #region 下载文件
                case "downloadfile":
                    Business.ATTACHMENT _ATTACHMENT = new Business.ATTACHMENT();
                    _ATTACHMENT.ATTACHMENT_ID_Encrypt = action_data;
                    if (_ATTACHMENT.Select())
                    {
                        string uploadPath = HttpContext.Current.Server.MapPath("~/UploadImageDir/CompactFile/") + "\\" + _ATTACHMENT.ATTACHMENT_NAME;
                        if (!System.IO.File.Exists(uploadPath))
                        {
                            context.Response.Write("error:服务器上该文件已被删除或不存在！"); 
                            return;
                        }
                        context.Response.Buffer = true;
                        context.Response.Clear();
                        context.Response.ContentType = "application/download";
                        string downFile = _ATTACHMENT.ATTACHMENT_NAME;//这里也可以随便取名
                        string EncodeFileName = HttpUtility.UrlEncode(downFile, System.Text.Encoding.UTF8);//防止中文出现乱码
                        context.Response.AddHeader("Content-Disposition", "attachment;filename=" + EncodeFileName + ";");
                        context.Response.BinaryWrite(System.IO.File.ReadAllBytes(uploadPath));//返回文件数据给客户端下载
                        _Transaction.AutoCommit();
                        context.Response.Flush();
                        context.Response.End();
                    }
                    break;

                #endregion
                case "deletefilebycode":
                     Business.ATTACHMENT _ATTACHMENT2 = new Business.ATTACHMENT();
                     _ATTACHMENT2.ATTACHMENT_ID_Encrypt = action_data;
                     if (_ATTACHMENT2.Select())
                     {
                         _ATTACHMENT2.Delete();
                         RetString = "1";
                    }
                    break;
            }
           
            context.Response.ContentType = "text/plain";
            context.Response.Write(RetString);
            context.Response.End();
        }
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}