using System;
using System.Collections.Generic;
using System.Linq;
using System.Data;
using System.Data.SqlClient;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using BLL;

namespace FineUIPro.Web.FileManager
{
    public partial class Read : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            doGetDocData();
        }


        /// <summary>
        /// 从数据库或者磁盘中读取文件并发送给客户端
        /// </summary>
        public void doGetDocData()
        {
            SqlDataReader objReader = null;
            SqlConnection conn = new SqlConnection(BLL.Funs.ConnString);
            if (conn.State == ConnectionState.Closed) conn.Open();
            try
            {
                string strcmd = string.Empty;
                string docid = Request.QueryString["docid"];
                string typeFlag = Request.QueryString["typeFlag"];

                if (!string.IsNullOrEmpty(docid))
                {
                    if (!string.IsNullOrEmpty(strcmd))
                    {
                        SqlCommand command = new SqlCommand(strcmd, conn);
                        command.CommandType = CommandType.Text;
                        objReader = command.ExecuteReader();

                        if (objReader.Read())
                        {
                            Response.AddHeader("Content-Disposition", "attachment; filename=" + objReader[0].ToString());
                            Response.AppendHeader("Contenttype", "application/msword");
                            //读取数据
                            byte[] buffer = new Byte[10240];
                            long datalen = objReader.GetBytes(1, 0, null, 0, 0);//["filedata"]
                            //Response.Write("datalen=" + datalen.ToString());
                            //*
                            long curPos = 0;
                            long readsize = 0;
                            readsize = objReader.GetBytes(1, curPos, buffer, 0, 10240);
                            while (readsize == 10240)
                            {
                                curPos += readsize;
                                Response.BinaryWrite(buffer);
                                Response.Flush();
                                readsize = objReader.GetBytes(1, curPos, buffer, 0, 10240);
                            }
                            byte[] rBuf = new Byte[readsize];
                            objReader.GetBytes(1, curPos, rBuf, 0, (int)readsize);
                            Response.BinaryWrite(rBuf);
                            Response.Flush();

                            //*/

                        }
                    }
                }

            }
            finally
            {
                if (objReader != null)
                { 
                    objReader.Close(); 
                }
                conn.Close();
            }
        }
    }
}