【C#】.NET中设置代理服务器浏览网页的实现

目前很多种类的浏览器中都有代理服务器的设置，用户可以通过浏览器自定义更换自己的IP，实现在线代理翻(河蟹)墙浏览网页。

 

 

而在.NET中，亦可以通过调用API函数InternetSetOption来实现自定义代理IP的设置。。

 

首先引用System.Runtime.InteropServices名字空间：

using System.Runtime.InteropServices;

 

接着引入"wininet.dll"库文件，并定义IP代理设置方法：

#region 在线代理
        public struct Struct_INTERNET_PROXY_INFO
        {
            public int dwAccessType;
            public IntPtr proxy;
            public IntPtr proxyBypass;
        };
        /// <summary>
        /// 定义API函数
        /// </summary>
        /// <param name="hInternet"></param>
        /// <param name="dwOption"></param>
        /// <param name="lpBuffer"></param>
        /// <param name="lpdwBufferLength"></param>
        /// <returns></returns>
        [DllImport("wininet.dll", SetLastError = true)]
        private static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int lpdwBufferLength);

        /// <summary>
        /// 刷新代理IP设置
        /// </summary>
        /// <param name="strProxy"></param>
        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));
        }

        /// <summary>
        /// 在线代理访问网页URL
        /// </summary>
        /// <param name="ip">代理IP</param>
        /// <param name="port">代理端口</param>
        /// <param name="url">要访问的网页URL</param>
        private void NaviByProxy(string ip, string port, string url)
        {
            ListViewItem item = this.lst.SelectedItems[0];
            //this.listView_usr.Items.Remove(item);

            RefreshIESettings(string.Format("{0}:{1}", ip, port));

            System.Object nullObject = 0;
            string strTemp = String.Empty;
            System.Object nullObjStr = strTemp;
            this.wbCnblog.Navigate(url);
        }
        
        #endregion

 

调用NaviByProxy该方法，代理浏览网页：

                if (lst.SelectedItems.Count > 0)
                {
                    //代理游览网站URL
                    NaviByProxy(
                        lst.SelectedItems[0].SubItems[0].Text, //选中的代理IP地址
                        lst.SelectedItems[0].SubItems[1].Text, //选中的代理IP的端口
                        textBox_url.Text.Trim()//url地址
                        );
                }
                else wbCnblog.Navigate(textBox_url.Text);

 

实际效果：

 

源码：

/Files/youuuu/code/proxy.rar