[C#]讀寫 INI檔 Win32 API

2009-11-05

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INI 檔案，格式如下：

[Section1]

key1=value1

key2=value2

[Section2]

key1=value1

key2=value2

使用Win32 API

程式畫面

程式碼

Form類別

using System;
using System.IO;
using System.Windows.Forms;

namespace ReadWriteini
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        /// <summary>
        /// use Win 32 API read ini file.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void win32apiread_Click(object sender, EventArgs e)
        {
            this.richTextBox1.Text = "";
            using (CINI myCINI = new CINI(Path.Combine(Application.StartupPath, "test.ini")))
            {
                string result = "";
                result += "[Section1]\n";
                result += "Key1=" + myCINI.getKeyValue("Section1", "key1") + "\n";
                result += "Key2=" + myCINI.getKeyValue("Section1", "key2") + "\n";
                result += "[Section2]\n";
                result += "Key1=" + myCINI.getKeyValue("Section2", "key1") + "\n";
                result += "Key2=" + myCINI.getKeyValue("Section2", "key2") + "\n";
                result += "Key3=" + myCINI.getKeyValue("Section2", "key3") + "\n";
                result += "Key4=" + myCINI.getKeyValue("Section2", "key4") + "\n";
                string a = myCINI.getKeyValue("Section3", "key1");
                if (!(a == ""))
                {
                    result += "[Section3]\n";
                    result += "Key1=" + myCINI.getKeyValue("Section3", "key1") + "\n";
                }
                this.richTextBox1.Text = result;
            }
        }
        /// <summary>
        /// use Win 32 API write ini file.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void win32apiwrite_Click(object sender, EventArgs e)
        {
            using (CINI myCINI = new CINI(Path.Combine(Application.StartupPath, "test.ini")))
            {
                string section = textBox1.Text;
                string key = textBox2.Text;
                string value = textBox3.Text;
                myCINI.setKeyValue(section, key, value);
            }
        }
    }
}

INI類別

using System;
using System.Text;

using System.Runtime.InteropServices;

namespace ReadWriteini
{
    class CINI:IDisposable
    {
        [DllImport("kernel32")]
        private static extern long WritePrivateProfileString(string section, string key, string val, string filePath);
        [DllImport("kernel32")]
        private static extern int GetPrivateProfileString(string section, string key, string def, StringBuilder retVal, int size, string filePath);

        private bool bDisposed = false;
        private string _FilePath = string.Empty;
        public string FilePath
        {
            get
            {
                if (_FilePath == null)
                    return string.Empty;
                else
                    return _FilePath;
            }
            set
            {
                if (_FilePath != value)
                    _FilePath = value;
            }
        }
                /// <summary>
        /// 建構子。
        /// </summary>
        /// <param name="path">檔案路徑。</param>
        public CINI(string path)
        {
            _FilePath = path;
        }
        /// <summary>
        /// 解構子。
        /// </summary>
        ~CINI()
        {
            Dispose(false);
        }

        /// <summary>
        /// 釋放資源(程式設計師呼叫)。
        /// </summary>
        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this); //要求系統不要呼叫指定物件的完成項。
        }
        /// <summary>
        /// 釋放資源(給系統呼叫的)。
        /// </summary>
        protected virtual void Dispose(bool IsDisposing)
        {
            if (bDisposed)
            {
                return;
            }

if (IsDisposing)
{

}

bDisposed = true;
}

        /// <summary>
        /// 設定 KeyValue 值。
        /// </summary>
        /// <param name="IN_Section">Section。</param>
        /// <param name="IN_Key">Key。</param>
        /// <param name="IN_Value">Value。</param>
        public void setKeyValue(string IN_Section, string IN_Key, string IN_Value)
        {
            WritePrivateProfileString(IN_Section, IN_Key, IN_Value, this._FilePath);
        }

        /// <summary>
        /// 取得 Key 相對的 Value 值。
        /// </summary>
        /// <param name="IN_Section">Section。</param>
        /// <param name="IN_Key">Key。</param>
        public string getKeyValue(string IN_Section, string IN_Key)
        {
            StringBuilder temp = new StringBuilder(255);
            int i = GetPrivateProfileString(IN_Section, IN_Key, "", temp, 255, this._FilePath);
            return temp.ToString();
        }

        /// <summary>
        /// 取得 Key 相對的 Value 值，若沒有則使用預設值(DefaultValue)。
        /// </summary>
        /// <param name="Section">Section。</param>
        /// <param name="Key">Key。</param>
        /// <param name="DefaultValue">DefaultValue。</param>
        public string getKeyValue(string Section, string Key, string DefaultValue)
        {
            StringBuilder sbResult = null;

            try
            {
                sbResult = new StringBuilder(255);

GetPrivateProfileString(Section, Key, "", sbResult, 255, this._FilePath);

                return (sbResult.Length > 0) ? sbResult.ToString() : DefaultValue;
            }
            catch
            {
                return string.Empty;
            }
        }
    }
}

執行結果：

使用Win32API讀取