C#读取ini文件的常用操作

README.md

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+# CSharpCommonClass
+C#常用类汇总
+
+1，iniFile.cs  by zhangbc 2015-07-05:此类包含了ini的基本的操作，主要功能是：存取ini文件中的数据。

iniFile.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Runtime.InteropServices;
+using System.IO;
+
+
+namespace DataPlantingForm
+{
+    /// <summary>
+    /// 操作INI文件类
+    /// by zhangbc 2015-07-06
+    /// </summary>
+    class iniFile
+    {
+        /// <summary>
+        /// 内存缓冲区的长度
+        /// </summary>
+        const int DATA_SIZE = 1024;
+        /// <summary>
+        /// 默认的内存缓冲区大小
+        /// </summary>
+        const uint MAX_BUFFER = 32767;
+        private string _path;
+        /// <summary>
+        /// ini文件及其路径
+        /// </summary>
+        private string iniPath
+        {
+            get {return _path;}
+            set { _path = value; }
+        }
+        [StructLayout(LayoutKind.Sequential,CharSet=CharSet.Auto)]
+        public struct StringBuffer
+        {
+            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = DATA_SIZE)]
+            public string sText;
+        }
+
+        #region API声明
+        /// <summary>
+        /// 将结点信息写入ini文件
+        /// </summary>
+        /// <param name="section">节点名称</param>
+        /// <param name="key">key值</param>
+        /// <param name="val">value值</param>
+        /// <param name="filePath">ini文件及其路径</param>
+        /// <returns>实际写入的长度</returns>
+        [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
+        private static extern long WritePrivateProfileString(string section, string key, string val, string filePath);
+
+        /// <summary>
+        /// 读取ini文件中指定的Key值(法一)
+        /// </summary>
+        /// <param name="section">节点名称</param>
+        /// <param name="key">key值</param>
+        /// <param name="def">读取失败时的默认值</param>
+        /// <param name="retVal">返回的value值(自定义结构型)</param>
+        /// <param name="size">内存缓冲区的长度</param>
+        /// <param name="filePath">ini文件及其路径</param>
+        /// <returns>实际读取到的长度</returns>
+        [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
+        private static extern int GetPrivateProfileString(string section, string key, string def, out StringBuffer retVal, int size, string filePath);
+
+        /// <summary>
+        /// 读取ini文件中指定的Key值(法二)
+        /// </summary>
+        /// <param name="section">节点名称</param>
+        /// <param name="key">key值</param>
+        /// <param name="def">读取失败时的默认值</param>
+        /// <param name="retVal">返回的value值(字符组型)</param>
+        /// <param name="size">内存缓冲区的长度</param>
+        /// <param name="filePath">ini文件及其路径</param>
+        /// <returns>实际读取到的长度</returns>
+        [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
+        private static extern uint GetPrivateProfileString(string section, string key, string def, [In,Out] char[] retVal, uint size, string filePath);
+
+        /// <summary>
+        /// 获取所有的结点名称
+        /// </summary>
+        /// <param name="szReturnBuffer">存放节点名称的内存地址,每个结点用\0间隔</param>
+        /// <param name="size">内存大小</param>
+        /// <param name="filePath">ini文件及其路径</param>
+        /// <returns>内容的实际长度,为0表示没有内容,为size-2表示内存大小不够</returns>
+        [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
+        private static extern uint GetPrivateProfileSectionNames(IntPtr szReturnBuffer, uint size, string filePath);
+
+        /// <summary>
+        /// 获取某个结点下的所有的Key和Value
+        /// </summary>
+        /// <param name="section">结点名称</param>
+        /// <param name="szReturnBuffer">存放节点名称的内存地址,每个结点用\0间隔</param>
+        /// <param name="size">内存大小</param>
+        /// <param name="filePath">ini文件及其路径</param>
+        /// <returns>内容的实际长度,为0表示没有内容,为size-2表示内存大小不够</returns>
+        [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
+        private static extern uint GetPrivateProfileSection(string section,IntPtr szReturnBuffer, uint size, string filePath);
+        #endregion
+
+        /// <summary>
+        /// 构造函数
+        /// </summary>
+        /// <param name="sPath">文件名及其路径</param>
+        public iniFile(string sPath)
+        {
+            this._path = sPath;
+            string path = iniPath.Substring(0, iniPath.LastIndexOf('\\'));
+            if (!Directory.Exists(path))
+                Directory.CreateDirectory(path);
+            if (!File.Exists(_path))
+                createIniFile();
+        }
+
+        /// <summary>
+        /// 写文件操作
+        /// </summary>
+        /// <param name="section">节点名称</param>
+        /// <param name="key">key值</param>
+        /// <param name="val">value值</param>
+        public void writeIniValue(string section,string key,string val)
+        {
+            WritePrivateProfileString(section,key,val,this._path);
+        }
+
+        /// <summary>
+        /// 读取ini文件的所有的section结点
+        /// </summary>
+        /// <returns>返回结点值列表</returns>
+        public string[] readiniSections()
+        {
+            string[] sections = new string[0];
+            //申请内存
+            IntPtr pString = Marshal.AllocCoTaskMem((int)MAX_BUFFER * sizeof(char));
+            uint byteReturned = GetPrivateProfileSectionNames(pString,MAX_BUFFER,this._path);
+            if(byteReturned!=0)
+            {
+                string local = Marshal.PtrToStringAuto(pString,(int)byteReturned).ToString();
+                sections = local.Split(new char[]{'\0'},StringSplitOptions.RemoveEmptyEntries);
+            }
+            //释放内存
+            Marshal.FreeCoTaskMem(pString);
+            return sections;
+        }
+
+        /// <summary>
+        /// 读取ini文件下指定结点下Key值列表
+        /// </summary>
+        /// <param name="section">节点名</param>
+        /// <returns>返回Key值列表</returns>
+        public string[] readIniKeys(string section)
+        {
+            string[] keys = new string[0];
+            const int SIZE = DATA_SIZE * 10;
+
+            if(string.IsNullOrEmpty(section))
+            {
+                throw new ArgumentException("必须指定节点名称","section");
+            }
+            char[] chars = new char[SIZE];
+            uint byteReturned = GetPrivateProfileString(section, null,null,chars, SIZE, this._path);
+            if (byteReturned != 0)
+            {
+                keys = new string(chars).Split(new char[] { '\0' }, StringSplitOptions.RemoveEmptyEntries);
+            }
+            chars = null;
+            return keys;
+        }
+
+        /// <summary>
+        /// 读取ini文件下指定key值的value
+        /// </summary>
+        /// <param name="section">节点名</param>
+        /// <param name="key">指定的key值</param>
+        /// <returns>value值</returns>
+        public string readIniValues(string section,string key)
+        {
+            StringBuffer retVal;
+            GetPrivateProfileString(section,key,null,out retVal,DATA_SIZE,this._path);
+            return retVal.sText.Trim();
+        }
+
+        /// <summary>
+        /// 读取ini文件下指定values值,重载
+        /// </summary>
+        /// <param name="section">节点名</param>
+        /// <param name="key">指定的key值</param>
+        /// <returns>value值</returns>
+        public string readIniValues(string section, string key, string defaultVal)
+        {
+            StringBuffer retVal;
+            GetPrivateProfileString(section, key, null, out retVal, DATA_SIZE, this._path);
+            string tmp=retVal.sText.Trim();
+            return tmp==""?defaultVal:tmp;
+        }
+
+        /// <summary>
+        /// 读取ini文件下指定结点的所有条目(key=value)
+        /// </summary>
+        /// <param name="section"></param>
+        /// <returns></returns>
+        public string[] readIniKeyVals(string section)
+        {
+            string[] items = new string[0];
+            //申请内存
+            IntPtr pString = Marshal.AllocCoTaskMem((int)MAX_BUFFER * sizeof(char));
+            uint byteReturned = GetPrivateProfileSection(section,pString, MAX_BUFFER, this._path);
+            if (!(byteReturned==MAX_BUFFER-2)||(byteReturned == 0))
+            {
+                string local = Marshal.PtrToStringAuto(pString, (int)byteReturned).ToString();
+                items = local.Split(new char[] { '\0' }, StringSplitOptions.RemoveEmptyEntries);
+            }
+            //释放内存
+            Marshal.FreeCoTaskMem(pString);
+            return items;
+        }
+
+        /// <summary>
+        /// 创建空文件ini
+        /// </summary>
+        public void createIniFile()
+        {
+            StreamWriter wr = File.CreateText(this._path);
+            wr.Write("");
+            wr.Flush();
+            wr.Close();
+        }
+    }
+}