换用代理IP的Webbrowser方法

用webbrowser做浏览器，换取代理IP是常用的功能，下面贴一段用到的换ip的代码！

View Code

public class MyWebBrowser : WebBrowser

    {

        [ComImport, Guid("34A715A0-6587-11D0-924A-0020AFC7AC4D"),

        InterfaceType(ComInterfaceType.InterfaceIsIDispatch),

        TypeLibType(TypeLibTypeFlags.FHidden)]

        public interface DWebBrowserEvents2

        {

            [DispId(271)]

            void NavigateError(

                [In, MarshalAs(UnmanagedType.IDispatch)] object pDisp,

                [In] ref object URL, [In] ref object frame,

                [In] ref object statusCode, [In, Out] ref bool cancel);

        }

        AxHost.ConnectionPointCookie cookie;

        MyWebBrowserEventHelper helper;

        public delegate void WebBrowserNavigateErrorEventHandler(object sender,

            WebBrowserNavigateErrorEventArgs e);



        [PermissionSetAttribute(SecurityAction.LinkDemand, Name = "FullTrust")]

        protected override void CreateSink()

        {

            base.CreateSink();

            // Create an instance of the client that will handle the event

            // and associate it with the underlying ActiveX control.

            helper = new MyWebBrowserEventHelper(this);

            cookie = new AxHost.ConnectionPointCookie(

                this.ActiveXInstance, helper, typeof(DWebBrowserEvents2));

        }

        [PermissionSetAttribute(SecurityAction.LinkDemand, Name = "FullTrust")]

        protected override void DetachSink()

        {

            // Disconnect the client that handles the event

            // from the underlying ActiveX control.

            if (cookie != null)

            {

                cookie.Disconnect();

                cookie = null;

            }

            base.DetachSink();

        }

        public event WebBrowserNavigateErrorEventHandler NavigateError;

        // Raises the NavigateError event.

        protected virtual void OnNavigateError(

            WebBrowserNavigateErrorEventArgs e)

        {

            if (this.NavigateError != null)

            {

                this.NavigateError(this, e);

            }

        }

        // Handles the NavigateError event from the underlying ActiveX 

        // control by raising the NavigateError event defined in this class.

        private class MyWebBrowserEventHelper :

            StandardOleMarshalObject, DWebBrowserEvents2

        {

            private MyWebBrowser parent;

            public MyWebBrowserEventHelper(MyWebBrowser parent)

            {

                this.parent = parent;

            }

            public void NavigateError(object pDisp, ref object url,

                ref object frame, ref object statusCode, ref bool cancel)

            {

                // Raise the NavigateError event.

                this.parent.OnNavigateError(

                    new WebBrowserNavigateErrorEventArgs(

                    (String)url, (String)frame, (Int32)statusCode, cancel));

            }

        }

    }

    public class WebBrowserNavigateErrorEventArgs : EventArgs

    {

        private String urlValue;

        private String frameValue;

        private Int32 statusCodeValue;

        private Boolean cancelValue;

        public WebBrowserNavigateErrorEventArgs(

            String url, String frame, Int32 statusCode, Boolean cancel)

        {

            urlValue = url;

            frameValue = frame;

            statusCodeValue = statusCode;

            cancelValue = cancel;

        }

        public String Url

        {

            get { return urlValue; }

            set { urlValue = value; }

        }

        public String Frame

        {

            get { return frameValue; }

            set { frameValue = value; }

        }

        public Int32 StatusCode

        {

            get { return statusCodeValue; }

            set { statusCodeValue = value; }

        }

        public Boolean Cancel

        {

            get { return cancelValue; }

            set { cancelValue = value; }

        }

    }

使用函数

View Code

[DllImport("wininet.dll", SetLastError = true)]

        private static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int lpdwBufferLength);

        public struct Struct_INTERNET_PROXY_INFO

        {

            public int dwAccessType;

            public IntPtr proxy;

            public IntPtr proxyBypass;

        };

        private void RefreshIESettings(string strProxy)

        {

            const int INTERNET_OPTION_PROXY = 38;

            const int INTERNET_OPEN_TYPE_PROXY = 3;



            Struct_INTERNET_PROXY_INFO struct_IPI;



            // Filling in structure 

            struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY;

            struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy);

            struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi("local");



            // Allocating memory 

            IntPtr intptrStruct = Marshal.AllocCoTaskMem(Marshal.SizeOf(struct_IPI));



            // Converting structure to IntPtr 

            Marshal.StructureToPtr(struct_IPI, intptrStruct, true);



            bool iReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, Marshal.SizeOf(struct_IPI));

        }

记在这里，以后学习！