/*----------------------------------------------------------------
// 文 件 名：INIControl.cs
// 功能描述：INI文件读写
// 
// 创建标识：彭玉柱 2010-07-12
//----------------------------------------------------------------*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Runtime.InteropServices;
using System.Collections.Specialized;
using System.Globalization;

namespace GeneralLib
{
    public class INIControl
    {
        private static INIControl iniColtrol;

        private static string filePath;//INI文件路径

        //声明读写INI文件的API函数
        [DllImport("kernel32")]
        private static extern bool WritePrivateProfileString(string section, string key, string val, string filePath);
        [DllImport("kernel32")]
        private static extern int GetPrivateProfileString(string section, string key, string def, byte[] retVal, int size, string filePath);

        /// <summary>
        /// 构造函数
        /// </summary>
        private INIControl()
        {
        }

        /// <summary>
        /// 得到INIControl对象
        /// </summary>
        /// <param name="filePath">INI文件路径，包括文件名</param>
        /// <returns>INIControl</returns>
        public static INIControl GetInstances(string filePath)
        {
            FileInfo fileInfo = new FileInfo(filePath);
            //判断INI文件是否存在
            if (!fileInfo.Exists)
            {
                throw (new ApplicationException("Ini文件不存在"));
            }
            
            INIControl.filePath = fileInfo.FullName;

            return iniColtrol == null ? iniColtrol = new INIControl() : iniColtrol;
        }

        /// <summary>
        /// 读取所有的段落（Section）的名称
        /// </summary>
        /// <param name="SectionList">StringCollection</param>
        public void ReadSections(StringCollection SectionList)
        {
            //Note:必须得用Bytes来实现，StringBuilder只能取到第一个Section
            byte[] buffer = new byte[65535];
            int bufLen = 0;
            bufLen = GetPrivateProfileString(null, null, null, buffer, buffer.GetUpperBound(0), filePath);
            GetStringsFromBuffer(buffer, bufLen, SectionList);
        }

        /// <summary>
        /// 字节数组转字符串集合
        /// </summary>
        /// <param name="buffer"></param>
        /// <param name="bufLen"></param>
        /// <param name="Strings"></param>
        private void GetStringsFromBuffer(Byte[] buffer, int bufLen, StringCollection Strings)
        {
            Strings.Clear();
            if (bufLen != 0)
            {
                int start = 0;
                for (int i = 0; i < bufLen; i++)
                {
                    if ((buffer[i] == 0) && ((i - start) > 0))
                    {
                        String s = Encoding.GetEncoding(0).GetString(buffer, start, i - start);
                        Strings.Add(s);
                        start = i + 1;
                    }
                }
            }
        }

        /// <summary>
        /// 写INI文件
        /// </summary>
        /// <param name="section">段落名</param>
        /// <param name="key">关键字</param>
        /// <param name="val">值</param>
        public void WriteValue(string section, string key, object val)
        {
            try
            {
                WritePrivateProfileString(section, key, val.ToString(), filePath);
            }
            catch (Exception ex)
            {
                SystemLog.WriterLog(ex, true);
            }
        }

        /// <summary>
        /// 读字符串
        /// </summary>
        /// <param name="section">段落名</param>
        /// <param name="key">关键字</param>
        /// <param name="defaultVal">无法读取时默认的值</param>
        /// <returns>值</returns>
        public string ReadString(string section, string key, string defaultVal)
        {
            Byte[] buffer = new Byte[65535];
            int bufLen = GetPrivateProfileString(section, key, defaultVal, buffer, buffer.GetUpperBound(0), filePath);
            //必须设定0（系统默认的代码页）的编码方式，否则无法支持中文
            string s = Encoding.GetEncoding(0).GetString(buffer);
            s = s.Substring(0, bufLen);
            return s.Trim().TrimEnd('\0');//杨斌 2016-07-06
        }

        /// <summary>
        /// 读整数
        /// </summary>
        /// <param name="section">段落名</param>
        /// <param name="key">关键字</param>
        /// <param name="defaultVal">无法读取时默认的值</param>
        /// <returns>值</returns>
        public int ReadInt(string section, string key, int defaultVal)
        {
            string val = this.ReadString(section, key, defaultVal.ToString());
            try
            {
                return Convert.ToInt16(val);
            }
            catch (Exception ex)
            {
                SystemLog.WriterLog(ex);

                return defaultVal;
            }
        }

        /// <summary>
        /// 读short值
        /// </summary>
        /// <param name="section">段落名</param>
        /// <param name="key">关键字</param>
        /// <param name="defaultVal">无法读取时默认的值</param>
        /// <returns>值</returns>
        public short ReadShort(string section, string key, short defaultVal)
        {
            string val = this.ReadString(section, key, defaultVal.ToString());
            try
            {
                return short.Parse(val);
            }
            catch (System.Exception ex)
            {
                SystemLog.WriterLog(ex);

                return defaultVal;
            }
        }

        /// <summary>
        /// 读bool值
        /// </summary>
        /// <param name="section">段落名</param>
        /// <param name="key">关键字</param>
        /// <param name="defaultVal">无法读取时默认的值</param>
        /// <returns>值</returns>
        public bool ReadBool(string section, string key, bool defaultVal)
        {
            string val = this.ReadString(section, key, defaultVal.ToString());
            try
            {
                return Convert.ToBoolean(val.ToLower());
            }
            catch (Exception ex)
            {
                SystemLog.WriterLog(ex);

                return defaultVal;
            }
        }

        /// <summary>
        /// 读double值
        /// </summary>
        /// <param name="section">段落名</param>
        /// <param name="key">关键字</param>
        /// <param name="defaultVal">无法读取时默认的值</param>
        /// <returns>值</returns>
        public double ReadDouble(string section, string key, double defaultVal)
        {
            string val = this.ReadString(section, key, defaultVal.ToString());
            val = ConvertOper.DoNumberString(val);//杨斌 2013-08-29
            try
            {
                return Convert.ToDouble(val);
            }
            catch (Exception ex)
            {
                SystemLog.WriterLog(ex);

                return defaultVal;
            }
        }
    }
}