C#学习笔记——读写ini文件

   1: using System;

   2: using System.Collections.Generic;

   3: using System.Linq;

   4: using System.Text;

   5: //引入命名空间

   6: using System.Collections.Specialized;

   7: using System.IO;

   8:  

   9:  

  10: namespace ConfigFiles

  11: {

  12:     /// <summary>

  13:     /// IniFiles的类

  14:     /// </summary>

  15:     public class IniFiles

  16:     {

  17:         public string FileName; //INI文件名

  18:  

  19:         //声明读写INI文件的API函数  

  20:         [System.Runtime.InteropServices.DllImport("kernel32")]

  21:         private static extern bool WritePrivateProfileString(string section, string key, string val, string filePath);

  22:         [System.Runtime.InteropServices.DllImport("kernel32")]

  23:         private static extern int GetPrivateProfileString(string section, string key, string def, byte[] retVal, int size, string filePath);

  24:  

  25:         //类的构造函数，传递INI文件名

  26:         public IniFiles(string AFileName)

  27:         {

  28:             // 判断文件是否存在

  29:             FileInfo fileInfo = new FileInfo(AFileName);

  30:  

  31:             //Todo:搞清枚举的用法

  32:             if ((!fileInfo.Exists))

  33:             { //|| (FileAttributes.Directory in fileInfo.Attributes))

  34:                 //文件不存在，建立文件

  35:                 System.IO.StreamWriter sw = new System.IO.StreamWriter(AFileName, false, System.Text.Encoding.Default);

  36:                 try

  37:                 {

  38:                     sw.Write("#应用程序配置文件");

  39:                     sw.Close();

  40:                 }

  41:  

  42:                 catch

  43:                 {

  44:                     throw (new ApplicationException("Ini文件不存在"));

  45:                 }

  46:             }

  47:  

  48:             //必须是完全路径，不能是相对路径

  49:             FileName = fileInfo.FullName;

  50:         }

  51:  

  52:         //写INI文件

  53:         public void WriteString(string Section, string Ident, string Value)

  54:         {

  55:             if (!WritePrivateProfileString(Section, Ident, Value, FileName))

  56:             {

  57:                 throw (new ApplicationException("写Ini文件出错"));

  58:             }

  59:         }

  60:  

  61:         //读取INI文件指定

  62:         public string ReadString(string Section, string Ident, string Default)

  63:         {

  64:             Byte[] Buffer = new Byte[65535];

  65:             int bufLen = GetPrivateProfileString(Section, Ident, Default, Buffer, Buffer.GetUpperBound(0), FileName);

  66:             //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

  67:             string s = Encoding.GetEncoding(0).GetString(Buffer);

  68:             s = s.Substring(0, bufLen);

  69:             return s.Trim();

  70:         }

  71:  

  72:         //读整数

  73:         public int ReadInteger(string Section, string Ident, int Default)

  74:         {

  75:             string intStr = ReadString(Section, Ident, Convert.ToString(Default));

  76:             try

  77:             {

  78:                 return Convert.ToInt32(intStr);

  79:  

  80:             }

  81:             catch (Exception ex)

  82:             {

  83:                 Console.WriteLine(ex.Message);

  84:                 return Default;

  85:             }

  86:         }

  87:  

  88:         //写整数

  89:         public void WriteInteger(string Section, string Ident, int Value)

  90:         {

  91:             WriteString(Section, Ident, Value.ToString());

  92:         }

  93:  

  94:         //读布尔

  95:         public bool ReadBool(string Section, string Ident, bool Default)

  96:         {

  97:             try

  98:             {

  99:                 return Convert.ToBoolean(ReadString(Section, Ident, Convert.ToString(Default)));

 100:             }

 101:             catch (Exception ex)

 102:             {

 103:                 Console.WriteLine(ex.Message);

 104:                 return Default;

 105:             }

 106:         }

 107:  

 108:         //写Bool

 109:         public void WriteBool(string Section, string Ident, bool Value)

 110:         {

 111:             WriteString(Section, Ident, Convert.ToString(Value));

 112:         }

 113:  

 114:         //从Ini文件中，将指定的Section名称中的所有Ident添加到列表中

 115:         public void ReadSection(string Section, StringCollection Idents)

 116:         {

 117:             Byte[] Buffer = new Byte[16384];

 118:             //Idents.Clear();

 119:  

 120:             int bufLen = GetPrivateProfileString(Section, null, null, Buffer, Buffer.GetUpperBound(0),

 121:              FileName);

 122:             //对Section进行解析

 123:             GetStringsFromBuffer(Buffer, bufLen, Idents);

 124:         }

 125:  

 126:         private void GetStringsFromBuffer(Byte[] Buffer, int bufLen, StringCollection Strings)

 127:         {

 128:             Strings.Clear();

 129:             if (bufLen != 0)

 130:             {

 131:                 int start = 0;

 132:                 for (int i = 0; i < bufLen; i++)

 133:                 {

 134:                     if ((Buffer[i] == 0) && ((i - start) > 0))

 135:                     {

 136:                         String s = Encoding.GetEncoding(0).GetString(Buffer, start, i - start);

 137:                         Strings.Add(s);

 138:                         start = i + 1;

 139:                     }

 140:                 }

 141:             }

 142:         }

 143:  

 144:         //从Ini文件中，读取所有的Sections的名称

 145:         public void ReadSections(StringCollection SectionList)

 146:         {

 147:             //Note:必须得用Bytes来实现，StringBuilder只能取到第一个Section

 148:             byte[] Buffer = new byte[65535];

 149:             int bufLen = 0;

 150:             bufLen = GetPrivateProfileString(null, null, null, Buffer,

 151:              Buffer.GetUpperBound(0), FileName);

 152:             GetStringsFromBuffer(Buffer, bufLen, SectionList);

 153:         }

 154:  

 155:         //读取指定的Section的所有Value到列表中

 156:         public void ReadSectionValues(string Section, NameValueCollection Values)

 157:         {

 158:             StringCollection KeyList = new StringCollection();

 159:             ReadSection(Section, KeyList);

 160:             Values.Clear();

 161:             foreach (string key in KeyList)

 162:             {

 163:                 Values.Add(key, ReadString(Section, key, ""));

 164:  

 165:             }

 166:         }

 167:  

 168:  

 169:         //清除某个Section

 170:         public void EraseSection(string Section)

 171:         {

 172:             //

 173:             if (!WritePrivateProfileString(Section, null, null, FileName))

 174:             {

 175:  

 176:                 throw (new ApplicationException("无法清除Ini文件中的Section"));

 177:             }

 178:         }

 179:  

 180:         //删除某个Section下的键

 181:         public void DeleteKey(string Section, string Ident)

 182:         {

 183:             WritePrivateProfileString(Section, Ident, null, FileName);

 184:         }

 185:  

 186:         //Note:对于Win9X，来说需要实现UpdateFile方法将缓冲中的数据写入文件

 187:         //在Win NT, 2000和XP上，都是直接写文件，没有缓冲，所以，无须实现UpdateFile

 188:         //执行完对Ini文件的修改之后，应该调用本方法更新缓冲区。

 189:         public void UpdateFile()

 190:         {

 191:             WritePrivateProfileString(null, null, null, FileName);

 192:         }

 193:  

 194:         //检查某个Section下的某个键值是否存在

 195:         public bool ValueExists(string Section, string Ident)

 196:         {

 197:             //

 198:             StringCollection Idents = new StringCollection();

 199:             ReadSection(Section, Idents);

 200:             return Idents.IndexOf(Ident) > -1;

 201:         }

 202:  

 203:         //确保资源的释放

 204:         ~IniFiles()

 205:         {

 206:             UpdateFile();

 207:         }

 208:     }

 209: }