using System;
using System.Runtime.InteropServices;
using System.Text;

namespace ErpServer
{
    public class INI
    {
        /// <summary>  
        /// 获取所有节点名称(Section)  
        /// </summary>  
        /// <param name="lpszReturnBuffer">存放节点名称的内存地址,每个节点之间用\0分隔</param>  
        /// <param name="nSize">内存大小(characters)</param>  
        /// <param name="lpFileName">Ini文件</param>  
        /// <returns>内容的实际长度,为0表示没有内容,为nSize-2表示内存大小不够</returns>  
        [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
        private static extern uint GetPrivateProfileSectionNames(IntPtr lpszReturnBuffer, uint nSize, string lpFileName);



        /// <summary>
        /// 写入INI文件
        /// </summary>
        /// <param name="section">节点名称[如[TypeName]]</param>
        /// <param name="key">键</param>
        /// <param name="val">值</param>
        /// <param name="filepath">文件路径</param>
        /// <returns></returns>
        [DllImport("kernel32")]
        private static extern long WritePrivateProfileString(string section, string key, string val, string filepath);
        /// <summary>
        /// 读取INI文件
        /// </summary>
        /// <param name="section">节点名称</param>
        /// <param name="key">键</param>
        /// <param name="def">值</param>
        /// <param name="retval">stringbulider对象</param>
        /// <param name="size">字节大小</param>
        /// <param name="filePath">文件路径</param>
        /// <returns></returns>
        [DllImport("kernel32")]
        private static extern int GetPrivateProfileString(string section, string key, string def, StringBuilder retval, int size, string filePath);


        [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
        private static extern uint GetPrivateProfileSection(string lpAppName, IntPtr lpReturnedString, uint nSize, string lpFileName);


        /// <summary>
        /// 自定义读取INI文件中的内容方法
        /// </summary>
        /// <param name="Section">键</param>
        /// <param name="key">值</param>
        /// <returns></returns>
        public static string GetIniValue(string Section, string key, string filePath)
        {
            StringBuilder temp = new StringBuilder(1024);
            GetPrivateProfileString(Section, key, "", temp, 1024, filePath);
            return temp.ToString();
        }

        public static void SetIniValue(string Section, string key, string value, string filePath)
        {
            WritePrivateProfileString(Section, key, value, filePath);
        }

        /// <summary>  
        /// 根据section取所有key  
        /// </summary>  
        /// <param name="section"></param>  
        /// <param name="filePath"></param>  
        /// <returns></returns>  
        public static string[] ReadIniAllKeys(string section, string filePath)
        {
            UInt32 MAX_BUFFER = 32767;

            string[] items = new string[0];

            IntPtr pReturnedString = Marshal.AllocCoTaskMem((int)MAX_BUFFER * sizeof(char));

            UInt32 bytesReturned = GetPrivateProfileSection(section, pReturnedString, MAX_BUFFER, filePath);

            if (!(bytesReturned == MAX_BUFFER - 2) || (bytesReturned == 0))
            {
                string returnedString = Marshal.PtrToStringAuto(pReturnedString, (int)bytesReturned);

                items = returnedString.Split(new char[] { '\0' }, StringSplitOptions.RemoveEmptyEntries);
            }

            Marshal.FreeCoTaskMem(pReturnedString);

            return items;
        }


        /// <summary>  
        /// 读取INI文件中指定INI文件中的所有节点名称(Section)  
        /// </summary>  
        /// <param name="iniFile">Ini文件</param>  
        /// <returns>所有节点,没有内容返回string[0]</returns>  
        public static string[] INIGetAllSectionNames(string iniFile)
        {
            uint MAX_BUFFER = 32767;    //默认为32767  

            string[] sections = new string[0];      //返回值  

            //申请内存  
            IntPtr pReturnedString = Marshal.AllocCoTaskMem((int)MAX_BUFFER * sizeof(char));
            uint bytesReturned = GetPrivateProfileSectionNames(pReturnedString, MAX_BUFFER, iniFile);
            if (bytesReturned != 0)
            {
                //读取指定内存的内容  
                string local = Marshal.PtrToStringAuto(pReturnedString, (int)bytesReturned).ToString();

                //每个节点之间用\0分隔,末尾有一个\0  
                sections = local.Split(new char[] { '\0' }, StringSplitOptions.RemoveEmptyEntries);
            }

            //释放内存  
            Marshal.FreeCoTaskMem(pReturnedString);

            return sections;
        }

        /// <summary>  
        /// 获取INI文件中指定节点(Section)中的所有条目(key=value形式)  
        /// </summary>  
        /// <param name="iniFile">Ini文件</param>  
        /// <param name="section">节点名称</param>  
        /// <returns>指定节点中的所有项目,没有内容返回string[0]</returns>  
        public static string[] INIGetAllItems(string iniFile, string section)
        {
            //返回值形式为 key=value,例如 Color=Red  
            uint MAX_BUFFER = 32767;    //默认为32767  

            string[] items = new string[0];      //返回值  

            //分配内存  
            IntPtr pReturnedString = Marshal.AllocCoTaskMem((int)MAX_BUFFER * sizeof(char));

            uint bytesReturned = GetPrivateProfileSection(section, pReturnedString, MAX_BUFFER, iniFile);

            if (!(bytesReturned == MAX_BUFFER - 2) || (bytesReturned == 0))
            {

                string returnedString = Marshal.PtrToStringAuto(pReturnedString, (int)bytesReturned);
                items = returnedString.Split(new char[] { '\0' }, StringSplitOptions.RemoveEmptyEntries);
            }

            Marshal.FreeCoTaskMem(pReturnedString);     //释放内存  

            return items;
        }


    }
}