WinHttpProxyWin32.cs

using System;
using System.Runtime.InteropServices;

namespace ProxySetup
{
    public abstract class WinHttpProxyWin32
    {
        /// <summary>
        /// WINHTTP_PROXY_INFO - structure supplied with WINHTTP_OPTION_PROXY to 
        /// get/set proxy information on a WinHttpOpen() handle
        /// </summary>
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        public struct WINHTTP_PROXY_INFO
        {
            /// <summary>
            /// see WINHTTP_ACCESS_* types
            /// </summary>
            public WINHTTP_ACCESS_TYPES dwAccessType;

            /// <summary>
            /// proxy server list
            /// </summary>
            public string lpszProxy;

            /// <summary>
            /// proxy bypass list
            /// </summary>
            public string lpszProxyBypass;
        }

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        public struct WINHTTP_AUTOPROXY_OPTIONS
        {
            public uint dwFlags;
            public uint dwAutoDetectFlags;
            public IntPtr lpszAutoConfigUrl;
            public IntPtr lpvReserved;
            public uint dwReserved;
            public bool fAutoLogonIfChallenged;
        };

        [StructLayout(LayoutKind.Sequential)]
        public struct WINHTTP_CURRENT_USER_IE_PROXY_CONFIG
        {
            public bool fAutoDetect;
            public IntPtr lpszAutoConfigUrl;
            public IntPtr lpszProxy;
            public IntPtr lpszProxyBypass;
        };

        /// <summary>
        /// WinHttpOpen dwAccessType values (also for WINHTTP_PROXY_INFO::dwAccessType)
        /// </summary>
        public enum WINHTTP_ACCESS_TYPES
        {
            WINHTTP_ACCESS_TYPE_DEFAULT_PROXY = 0,
            WINHTTP_ACCESS_TYPE_NO_PROXY = 1,
            WINHTTP_ACCESS_TYPE_NAMED_PROXY = 3
        }

        public const string WINHTTP_NO_PROXY_NAME = null;
        public const string WINHTTP_NO_PROXY_BYPASS = null;

        [DllImport("winhttp.dll", CharSet = CharSet.Unicode, SetLastError = true)]
        public static extern bool WinHttpSetDefaultProxyConfiguration(ref WINHTTP_PROXY_INFO info);

        [DllImport("winhttp.dll", CharSet = CharSet.Unicode, SetLastError = true)]
        public static extern bool WinHttpGetDefaultProxyConfiguration(ref WINHTTP_PROXY_INFO info);

        //[DllImport("winhttp", CharSet = CharSet.Unicode, SetLastError = true)]
        //private extern static System.IntPtr WinHttpOpen(string pwszUserAgent, uint dwAccessType, string pwszProxyName, string pwszProxyBypass, uint dwFlags);
        //[DllImport("winhttp", CharSet = CharSet.Unicode, SetLastError = true)]
        //private extern static bool WinHttpGetProxyForUrl(System.IntPtr hSession, string lpcwszUrl, ref WINHTTP_AUTOPROXY_OPTIONS pAutoProxyOptions, ref WINHTTP_PROXY_INFO pProxyInfo);
        //[DllImport("winhttp")]
        //private extern static bool WinHttpCloseHandle(System.IntPtr hInternet);
        [DllImport("winhttp")]
        private extern static bool WinHttpGetIEProxyConfigForCurrentUser(ref WINHTTP_CURRENT_USER_IE_PROXY_CONFIG pProxyConfig);
        //[DllImport("winhttp", CharSet = CharSet.Unicode, SetLastError = true)]
        //private extern static System.IntPtr WinHttpConnect(IntPtr hSession, string pswzServerName, ushort nServerPort, uint dwReserved);
        //[DllImport("winhttp", CharSet = CharSet.Unicode, SetLastError = true)]
        //private extern static bool WinHttpCrackUrl(string pwszUrl, int dwUrlLength, uint dwFlags, ref URL_COMPONENTS lpUrlComponents);
        //[DllImport("winhttp", CharSet = CharSet.Unicode, SetLastError = true)]
        //private extern static System.IntPtr WinHttpOpenRequest
        //(IntPtr hConnect, string pwszVerb, IntPtr pwszObjectName, string pwszVersion, string pwszReferrer, IntPtr ppwszAcceptTypes, uint dwFlags);
        [DllImport("winhttp", SetLastError = true)]
        private extern static bool WinHttpSetOption(IntPtr hInternet, uint dwOption, ref WINHTTP_PROXY_INFO lpBuffer, int dwBufferLength);
        //[DllImport("winhttp", CharSet = CharSet.Unicode, SetLastError = true)]
        //private extern static bool WinHttpSendRequest(IntPtr hRequest, string pwszHeaders, uint dwHeadersLength, IntPtr lpOptional, uint dwOptionalLength, uint dwTotalLength, ref uint dwContext);
        //[DllImport("winhttp", SetLastError = true)]
        //private extern static bool WinHttpReceiveResponse(IntPtr hRequest, IntPtr lpReserved);
        //[DllImport("winhttp", SetLastError = true)]
        //private extern static bool WinHttpQueryDataAvailable(IntPtr hRequest, ref uint lpdwNumberOfBytesAvailable);
        //[DllImport("winhttp", SetLastError = true)]
        //unsafe private extern static bool WinHttpReadData(IntPtr hRequest, void* lpBuffer, uint dwNumberOfBytesToRead, ref uint lpdwNumberOfBytesRead);


    }
}