[Implement] Read/Write INI File

2013-07-15
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);
            }
        }
    }
}
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