在C#中通过Windows API读写INI文件的简单实现代码

摘要

INI文件是比较常用的配置文件格式，在C#中，没有提供对INI文件直接读写的类库，要想实现INI文件的读写，需要借助Windows API GetPrivateProfileString和WritePrivateProfileString两个方法来实现。

INI写入字符串和整数

借助Windows API，写入字符串和整数类型到INI文件中的参考代码如下：

    static class IniWriter
    {
        [DllImport(kernel32)]
        private static extern int WritePrivateProfileString(string section, string key, string val, string filepath);

        /// summary
        /// Write string
        /// /summary
        /// param name=fileName/param
        /// param name=Section/param
        /// param name=key/param
        /// param name=val/param
        /// returns/returns
        public static int WriteString(string fileName, string Section, string key, string val)
        {
            if (!val.StartsWith(\))
            {
                val = $\{val}\;
            }
            return WritePrivateProfileString(Section, key, val, fileName);
        }

        /// summary
        /// Write integer
        /// /summary
        /// param name=fileName/param
        /// param name=Section/param
        /// param name=key/param
        /// param name=val/param
        /// returns/returns
        public static int WriteInteger(string fileName, string Section, string key, int val)
        {
            return WritePrivateProfileString(Section, key, val.ToString(), fileName);
        }
    }

INI读取字符串和整数

与写入字符串和整数类似，从INI文件读取字符串和整数类型的参考代码如下：

    static class IniReader
    {

        [DllImport(kernel32)]
        private static extern int GetPrivateProfileString(string section, string key, string def, byte[] retVal, int size, string filePath);

        /// summary
        /// 读取INI文件指定
        /// /summary
        /// param name=fileName/param
        /// param name=Section/param
        /// param name=Ident/param
        /// param name=Default/param
        /// returns/returns
        public static string ReadString(string fileName, string Section, string Ident, string Default)
        {
            byte[] Buffer = new byte[512];
            int bufLen = GetPrivateProfileString(Section, Ident, Default, Buffer, Buffer.Length, fileName);
            //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();
        }

        /// summary
        /// 读整数
        /// /summary
        /// param name=fileName/param
        /// param name=Section/param
        /// param name=Ident/param
        /// param name=Default/param
        /// returns/returns
        public static int ReadInteger(string fileName, string Section, string Ident, int Default)
        {
            string intStr = ReadString(fileName, Section, Ident, Convert.ToString(Default));
            try
            {
                return Convert.ToInt32(intStr);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return Default;
            }
        }
    }

结语

以上给出了借助Windows API在C#中读写INI文件整数和字符串类型的数据，这是比较简单干净的INI读写方法，如果需要更为复杂完善的方法，可以使用三方的INI文件读写库，将在后续的文章中介绍。