C#で ini ファイルから値を読み込むコードと実行結果

概要

プログラム

事前準備:iniファイルの作成

[Data]
Name=Penguin
ID=12

UI

コード

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace IniFileReadDemo
{
  public partial class FormMain : Form
  {
    [DllImport("kernel32.dll", EntryPoint = "GetPrivateProfileStringW", CharSet = CharSet.Unicode, SetLastError = true)]
    static extern uint GetPrivateProfileString(string lpAppName, string lpKeyName, string lpDefault, StringBuilder lpReturnedString, uint nSize, string lpFileName);

    public FormMain()
    {
      InitializeComponent();
    }

    private void Button1_Click(object sender, EventArgs e)
    {
      int capacitySize = 256;

      StringBuilder sb = new StringBuilder(capacitySize);
      uint ret = GetPrivateProfileString("Data", "Name", "none", sb, Convert.ToUInt32(sb.Capacity), ".\\file.ini");
      if (0 < ret){
        textBox1.Text += "Name:" + sb.ToString() + "\r\n";
      }

      sb = new StringBuilder(capacitySize);
      ret = GetPrivateProfileString("Data", "ID", "none", sb, Convert.ToUInt32(sb.Capacity), ".\\file.ini");
      if (0 < ret) {
        textBox1.Text += "ID:"  +sb.ToString() + "\r\n";
      }
    }
  }
}

解説

using System.Runtime.InteropServices;

    [DllImport("kernel32.dll", EntryPoint = "GetPrivateProfileStringW", CharSet = CharSet.Unicode, SetLastError = true)]
    static extern uint GetPrivateProfileString(string lpAppName, string lpKeyName, string lpDefault, StringBuilder lpReturnedString, uint nSize, string lpFileName);

      int capacitySize = 256;

      StringBuilder sb = new StringBuilder(capacitySize);
      uint ret = GetPrivateProfileString("Data", "Name", "none", sb, Convert.ToUInt32(sb.Capacity), ".\\file.ini");
      if (0 < ret){
        textBox1.Text += "Name:" + sb.ToString() + "\r\n";
      }

      sb = new StringBuilder(capacitySize);
      ret = GetPrivateProfileString("Data", "ID", "none", sb, Convert.ToUInt32(sb.Capacity), ".\\file.ini");
      if (0 < ret) {
        textBox1.Text += "ID:"  +sb.ToString() + "\r\n";
      }

実行結果

      uint ret = GetPrivateProfileString("Data", "Name", "none", sb, Convert.ToUInt32(sb.Capacity), AppDomain.CurrentDomain.BaseDirectory + "file.ini");

著者

Penta

iPentecのメインプログラマー
C#, ASP.NET の開発がメイン、少し前まではDelphiを愛用