using System;
using System.IO;
using System.Xml;

namespace SiaSun.LMS.Common
{
	/// <summary>
	/// 文件读写类
	/// </summary>
	public class File
	{
        /// <summary>
        /// 构造函数
        /// </summary>
        public File()
		{
		}

		#region		------读写.txt文件
		/// <summary>
		/// 向txt文件中写内容
		/// </summary>
        /// <param name="contents">写入内容</param>
        /// <param name="path">文件路径</param>
		static public void WriteToText(string contents,string path)
		{
			StreamWriter sr = null;
			try
			{
                if (System.IO.File.Exists(path))
					sr = new StreamWriter(path);
				else
                    sr = System.IO.File.CreateText(path);
				sr.WriteLine(contents);
			}
			catch(IOException iox)
			{				
				throw new Exception("Faile to Write to File",iox);
			}
			finally
			{
				sr.Close();
			}
		}

		/// <summary>
        /// 从txt文件中读数据
		/// </summary>
		/// <param name="path">文件路径</param>
		static public string ReadFromText(string path)
		{
			StreamReader sr = null;
			try
			{
                if (!System.IO.File.Exists(path))
					return string.Empty;
                sr = System.IO.File.OpenText(path);
                System.Text.StringBuilder input = new System.Text.StringBuilder();
				input.Append(sr.ReadToEnd());
				
				return input.ToString();
			}
			catch(IOException iox)
			{
				throw new Exception("Faile to Read File",iox);
			}
			finally
			{
				sr.Close();
			}
		}
		#endregion

		#region		------读写XML文件
		/// <summary>
        /// 读xml文件中指定节点的InnerText值
		/// </summary>
        /// <param name="path">xml文件路径名</param>
		/// <param name="nodeName">节点路径</param>
		/// <returns>返回节点值</returns>
		public static string ReadXml(string path,string nodeName)
		{
			XmlDocument docXML = new XmlDocument();
			try
			{
				docXML.Load(path);
				XmlNode node = docXML.SelectSingleNode(nodeName);
				docXML.Save(path);
				return node.InnerText;
			}
			catch(XmlException ex)
			{
				throw new Exception("Faile to Read XML File",ex);
			}
		}
		/// <summary>
		/// 向xml文件中指定节点赋值
		/// </summary>
		/// <param name="path">xml文件路径名</param>
		/// <param name="nodeName">节点路径</param>
        /// <param name="nodeValue">节点值</param>
		/// <returns>返回节点值</returns>
		public static void WriteXml(string path,string nodeName,string nodeValue)
		{
			try
			{
				XmlDocument docXML = new XmlDocument();
				docXML.Load(path);
				XmlNode node = docXML.SelectSingleNode(nodeName);
				node.InnerText = nodeValue;
				docXML.Save(path);	
			}
			catch(XmlException ex)
			{
				throw new Exception("Faile to Write XML File",ex);
			}
		}
		#endregion

        #region     ------判断指定文件夹是否存在，不存在则创建

        /// <summary>
        /// 创建并返回保存目录,在执行程序的磁盘目录下创建，指定文件夹
        /// </summary>
        /// <param name="SavedDicName">保存的文件夹路径</param>
        public static string GetDicPath(string SavedDicName)
        {
            //获得根目录
            string rootDic = Directory.GetDirectoryRoot(AppDomain.CurrentDomain.BaseDirectory);
            string path = Path.Combine(rootDic, SavedDicName);

            //判断根目录指定文件夹是否存在
            if (!Directory.Exists(SavedDicName))
            {
                Directory.CreateDirectory(path);
            }
            return path;
        }

        
        /// <summary>
        /// //判断文件是否存在,不存在，创建
        /// </summary>
        /// <param name="strFile"></param>
        /// <returns></returns>
        public static string GetFile(string strFile)
        {
            if (!System.IO.File.Exists(strFile))
            {
                System.IO.File.Create(strFile);
            }

            return strFile;
        }

        #endregion

        #region     ------向指定文件夹路径，以日期为文件名，创建文件并写入信息

        /// <summary>
        /// 向指定文件中写入信息
        /// </summary>
        /// <param name="RootDicPath">上级目录路径</param>
        /// <param name="Content">写入内容</param>
        public static void WriteToEveryDayFile(string DicName, string Content)
        {
            //获得或创建指定文件夹路径
            string dicPath = GetDicPath(DicName);

            //获得写入的文件名
            string fileName = DateTime.Now.Year.ToString() + "-" + DateTime.Now.Month.ToString() + "-" + DateTime.Now.Day.ToString();
            //文件路径
            string filePath = Path.Combine(dicPath, fileName + ".txt");

            //创建文件流，写入文件
            FileStream flStream = null;
            StreamWriter writer = null;
            try
            {
                flStream = new FileStream(filePath, FileMode.Append, FileAccess.Write);
                writer = new StreamWriter(flStream);
                writer.WriteLine(DateTime.Now.ToString());
                writer.Write(Content);
                writer.WriteLine();
                writer.WriteLine();
                writer.Flush();
            }
            catch (IOException ex)
            {
                throw new Exception(ex.Message);
            }
            finally
            {
                writer.Close();
                flStream.Close();
            }
        }
        #endregion
    }
}