Programs Knowledge

using System;

using System.Collections.Generic;

using System.Windows.Forms;

using System.Text;

namespace ReadWrite_INI_File

{

    class Program

    {

        //讀寫INI文件API函數

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

        //傳入參數: 1.區段名稱、2.參數名稱、3.預設回傳值（若無符合區段名稱與參數名稱，則回傳預設值）

        //4.StringBuffer物件、5.StringBuffer物件大小、6.INI文件完整路徑

        private static extern int GetPrivateProfileString(string section, string key, string def,

            System.Text.StringBuilder retVal, int size, string filePath);

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

        //傳入參數: 1.區段名稱、2.參數名稱、3.參數內容、4.INI文件完整路徑

        private static extern long WritePrivateProfileString(string section, string key, string val,

            string filePath);

        public static string ReadIniValues(string section, string key, string path)

        {

            System.Text.StringBuilder sb = new System.Text.StringBuilder(22000);

            int i = GetPrivateProfileString(section, key, "Not Found", sb, 22000, path);

            return sb.ToString();

        }

        static void Main(string[] args)

        {

            string iniPath = System.IO.Path.GetDirectoryName(System.Windows.Forms.Application.ExecutablePath) + "\\Setting.ini";

            if (System.IO.File.Exists(iniPath))

            {

                string location = ReadIniValues("Location", "Location1", iniPath);

                //result = 10, 50

                string size1 = ReadIniValues("FormSize", "Size1", iniPath);

                //result = 10

                string size2 = ReadIniValues("FormSize", "Size99", iniPath);

                //result = Not Found

            }

            else

            {

                //寫入時，若INI文件完整路徑中沒有該INI檔，那麼會自動產生一個INI檔

                //Insert: 1.區段名稱與參數名稱皆不在INI中，那麼會新增一個該區段名稱，

                //          而該區段名稱底下也會新增該參數名稱與參數內容

                //        2.區段名稱在INI中，但參數名稱不在INI檔裡，那麼會在該區段名稱

                //          底下新增該參數名稱與參數內容

                //Update: 區段名稱與參數名稱皆須在INI檔中才會更新，否則會執行Inser動作

                WritePrivateProfileString("Location", "Location1", "10,50", iniPath);

                WritePrivateProfileString("Location", "Location2", "20,100", iniPath);

                WritePrivateProfileString("FormSize", "Size1", "10", iniPath);

                WritePrivateProfileString("FormSize", "Size2", "100", iniPath);

            }

        }

    }

}