[C#/COMMON] 웹 브라우저에서 프록시 서버 사용하기

■ 웹 브라우저에서 프록시 서버를 사용하는 방법을 보여준다.

TestProject.zip

다운로드

▶ MainForm.cs

using Microsoft.Win32;
using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace TestProject
{
    /// <summary>
    /// 메인 폼
    /// </summary>
    public partial class MainForm : Form
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Import
        ////////////////////////////////////////////////////////////////////////////////////////// Static
        //////////////////////////////////////////////////////////////////////////////// Private

        #region 인터넷 옵션 설정하기 - InternetSetOption(internetHandle, option, bufferHandle, bufferLength)

        /// <summary>
        /// 인터넷 옵션 설정하기
        /// </summary>
        /// <param name="internetHandle">인터넷 핸들</param>
        /// <param name="option">옵션</param>
        /// <param name="bufferHandle">버퍼 핸들</param>
        /// <param name="bufferLength">버퍼 길이</param>
        /// <returns>처리 결과</returns>
        [DllImport("wininet.dll")]
        private static extern bool InternetSetOption(IntPtr internetHandle, int option, IntPtr bufferHandle, int bufferLength);

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Field
        ////////////////////////////////////////////////////////////////////////////////////////// Private

        #region Field

        /// <summary>
        /// 레지스트리
        /// </summary>
        private RegistryKey registry = Registry.CurrentUser.OpenSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings", true);

        /// <summary>
        /// INTERNET_OPTION_SETTINGS_CHANGED
        /// </summary>
        private const int INTERNET_OPTION_SETTINGS_CHANGED = 39;

        /// <summary>
        /// INTERNET_OPTION_REFRESH
        /// </summary>
        private const int INTERNET_OPTION_REFRESH = 37;

        /// <summary>
        /// Proxy URL
        /// </summary>
        private string proxyURL = null;

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - MainForm()

        /// <summary>
        /// 생성자
        /// </summary>
        public MainForm()
        {
            InitializeComponent();

            Load                                          += Form_Load;
            this.addressTextBox.KeyPress                  += addressTextBox_KeyPress;
            this.goButton.Click                           += goButton_Click;
            this.proxyServerComboBox.SelectedIndexChanged += proxyServerComboBox_SelectedIndexChanged;
            this.setupButton.Click                        += setupButton_Click;
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Private

        #region 폼 로드시 처리하기 - Form_Load(sender, e)

        /// <summary>
        /// 폼 로드시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void Form_Load(object sender, EventArgs e)
        {
            this.proxyServerComboBox.Text = "OFF";
        }

        #endregion
        #region 주소 텍스트 박스 키 PRESS 처리하기 - addressTextBox_KeyPress(sender, e)

        /// <summary>
        /// 주소 텍스트 박스 키 PRESS 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void addressTextBox_KeyPress(object sender, KeyPressEventArgs e)
        {
            if(e.KeyChar == (char)13)
            {
                this.webBrowser.Navigate(this.addressTextBox.Text);
            }
        }

        #endregion
        #region 이동 버튼 클릭시 처리하기 - goButton_Click(sender, e)

        /// <summary>
        /// 이동 버튼 클릭시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void goButton_Click(object sender, EventArgs e)
        {
            this.webBrowser.Navigate(this.addressTextBox.Text);
        }

        #endregion
        #region 프록시 서버 콤보 박스 선택 인덱스 변경시 처리하기 - proxyServerComboBox_SelectedIndexChanged(sender, e)

        /// <summary>
        /// 프록시 서버 콤보 박스 선택 인덱스 변경시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void proxyServerComboBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            try
            {
                this.proxyServerComboBox.SelectedIndexChanged -= proxyServerComboBox_SelectedIndexChanged;

                if(this.proxyServerComboBox.Text == "ON")
                {
                    if(this.proxyURL != null)
                    {
                        registry.SetValue("ProxyServer", this.proxyURL);
                        registry.SetValue("ProxyEnable", 1);

                        InternetSetOption(IntPtr.Zero, INTERNET_OPTION_SETTINGS_CHANGED, IntPtr.Zero, 0);

                        InternetSetOption(IntPtr.Zero, INTERNET_OPTION_REFRESH, IntPtr.Zero, 0);
                    }
                    else
                    {
                        this.proxyServerComboBox.Text = "OFF";
                    }
                }
                else
                {
                    registry.SetValue("ProxyServer", "");
                    registry.SetValue("ProxyEnable", 0 );

                    InternetSetOption(IntPtr.Zero, INTERNET_OPTION_SETTINGS_CHANGED, IntPtr.Zero, 0);

                    InternetSetOption(IntPtr.Zero, INTERNET_OPTION_REFRESH, IntPtr.Zero, 0);
                }
            }
            finally
            {
                this.proxyServerComboBox.SelectedIndexChanged += proxyServerComboBox_SelectedIndexChanged;
            }
        }

        #endregion
        #region 설정 버튼 클릭시 처리하기 - setupButton_Click(sender, e)

        /// <summary>
        /// 설정 버튼 클릭시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void setupButton_Click(object sender, EventArgs e)
        {
            SettingForm form = new SettingForm();

            form.ShowDialog(this);

            this.proxyURL = form.ProxyServerURL;

            if (this.proxyURL == null)
            {
                this.proxyServerComboBox.Text = "OFF";
            }
            else
            {
                this.proxyServerComboBox.Text = "ON";
            }
        }

        #endregion
    }
}