Ini文件操作函数

 /// <summary>
        /// Copies a string into the specified section of an initialization file.
        /// </summary>
        /// <param name="lpAppName">The name of the section to which the string will be copied. If the section does not exist, it is created. The name of the section is case-independent; the string can be any combination of uppercase and lowercase letters.</param>
        /// <param name="lpKeyName">The name of the key to be associated with a string. If the key does not exist in the specified section, it is created. If this parameter is NULL, the entire section, including all entries within the section, is deleted.</param>
        /// <param name="lpString">A null-terminated string to be written to the file. If this parameter is NULL, the key pointed to by the lpKeyName parameter is deleted.</param>
        /// <param name="lpFileName">The name of the initialization file.If the file was created using Unicode characters, the function writes Unicode characters to the file. Otherwise, the function writes ANSI characters.</param>
        /// <returns>If the function successfully copies the string to the initialization file, the return value is nonzero.</returns>
        [DllImport("kernel32")]
        private static extern bool WritePrivateProfileString(string lpAppName, string lpKeyName, string lpString, string lpFileName);
        /// <summary>
        /// Retrieves a string from the specified section in an initialization file.
        /// </summary>
        /// <param name="lpAppName">The name of the section containing the key name. If this parameter is NULL, the GetPrivateProfileString function copies all section names in the file to the supplied buffer.</param>
        /// <param name="lpKeyName">The name of the key whose associated string is to be retrieved. If this parameter is NULL, all key names in the section specified by the lpAppName parameter are copied to the buffer specified by the lpReturnedString parameter.</param>
        /// <param name="lpDefault">A default string. If the lpKeyName key cannot be found in the initialization file, GetPrivateProfileString copies the default string to the lpReturnedString buffer. If this parameter is NULL, the default is an empty string, "".</param>
        /// <param name="lpReturnedString">A pointer to the buffer that receives the retrieved string.</param>
        /// <param name="nSize">The size of the buffer pointed to by the lpReturnedString parameter, in characters.</param>
        /// <param name="lpFileName">The name of the initialization file. If this parameter does not contain a full path to the file, the system searches for the file in the Windows directory.</param>
        /// <returns>The return value is the number of characters copied to the buffer, not including the terminating null character.</returns>
        [DllImport("kernel32")]
        private static extern int GetPrivateProfileString(string lpAppName, string lpKeyName, string lpDefault, StringBuilder lpReturnedString, int nSize, string lpFileName);