这段代码没法链接拨号，怎么改

[sexfio]

using System;
using System.Runtime.InteropServices;

namespace TaskHelper
{
    public struct RASCONN
    {
        public int dwSize;
        public IntPtr hrasconn;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 257)]
        public string szEntryName;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 17)]
        public string szDeviceType;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 129)]
        public string szDeviceName;
    }

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
    public struct RasStats
    {
        public int dwSize;
        public int dwBytesXmited;
        public int dwBytesRcved;
        public int dwFramesXmited;
        public int dwFramesRcved;
        public int dwCrcErr;
        public int dwTimeoutErr;
        public int dwAlignmentErr;
        public int dwHardwareOverrunErr;
        public int dwFramingErr;
        public int dwBufferOverrunErr;
        public int dwCompressionRatioIn;
        public int dwCompressionRatioOut;
        public int dwBps;
        public int dwConnectionDuration;
    }

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
    public struct RasEntryName
    {
        public int dwSize;
        //[MarshalAs(UnmanagedType.ByValTStr,SizeConst=(int)RasFieldSizeConstants.RAS_MaxEntryName + 1)]
        public string szEntryName;
        //#if WINVER5
        //  public int dwFlags;
        //  [MarshalAs(UnmanagedType.ByValTStr,SizeConst=260+1)]
        //  public string szPhonebookPath;
        //#endif
    }

    public class RAS
    {
        [DllImport("RaSAPi32.dll", EntryPoint = "RasEnumConnectionsA",
             SetLastError = true)]

        internal static extern int RasEnumConnections
            (
            ref RASCONN lprasconn, // buffer to receive connections data
            ref int lpcb, // size in bytes of buffer
            ref int lpcConnections // number of connections written to buffer
            );


        [DllImport("rasapi32.dll", CharSet = CharSet.Auto)]
        internal static extern uint RasGetConnectionStatistics(
            IntPtr hRasConn,       // handle to the connection
            [In, Out]RasStats lpStatistics  // buffer to receive statistics
            );
        [DllImport("rasapi32.dll", CharSet = CharSet.Auto)]
        public extern static uint RasHangUp(
            IntPtr hrasconn  // handle to the RAS connection to hang up
            );

        [DllImport("rasapi32.dll", CharSet = CharSet.Auto)]
        public extern static uint RasEnumEntries(
            string reserved,              // reserved, must be NULL
            string lpszPhonebook,         // pointer to full path and
            //  file name of phone-book file
            [In, Out]RasEntryName[] lprasentryname, // buffer to receive
            //  phone-book entries
            ref int lpcb,                  // size in bytes of buffer
            out int lpcEntries             // number of entries written
            //  to buffer
            );

        [DllImport("wininet.dll", CharSet = CharSet.Auto)]
        public extern static int InternetDial(
            IntPtr hwnd,
            [In]string lpszConnectoid,
            uint dwFlags,
            ref int lpdwConnection,
            uint dwReserved
            );

        public RAS()
        {

        }


    }

    public enum DEL_CACHE_TYPE //要删除的类型。
    {
        File,//表示internet临时文件
        Cookie //表示Cookie
    };

    public class RASDisplay
    {
        [DllImport("wininet.dll", CharSet = CharSet.Auto)]
        public static extern bool DeleteUrlCacheEntry(
            DEL_CACHE_TYPE type
            );
        private string m_duration;
        private string m_ConnectionName;
        private string[] m_ConnectionNames;
        private double m_TX;
        private double m_RX;
        private bool m_connected;
        private IntPtr m_ConnectedRasHandle;

        RasStats status = new RasStats();
        public RASDisplay()
        {
            m_connected = true;

            RAS lpras = new RAS();
            RASCONN lprasConn = new RASCONN();

            lprasConn.dwSize = Marshal.SizeOf(typeof(RASCONN));
            lprasConn.hrasconn = IntPtr.Zero;

            int lpcb = 0;
            int lpcConnections = 0;
            int nRet = 0;
            lpcb = Marshal.SizeOf(typeof(RASCONN));


            nRet = RAS.RasEnumConnections(ref lprasConn, ref lpcb, ref
            lpcConnections);


            if (nRet != 0)
            {
                m_connected = false;
                return;

            }

            if (lpcConnections > 0)
            {


                //for (int i = 0; i < lpcConnections; i++)

                //{
                RasStats stats = new RasStats();

                m_ConnectedRasHandle = lprasConn.hrasconn;
                RAS.RasGetConnectionStatistics(lprasConn.hrasconn, stats);


                m_ConnectionName = lprasConn.szEntryName;

                int Hours = 0;
                int Minutes = 0;
                int Seconds = 0;

                Hours = ((stats.dwConnectionDuration / 1000) / 3600);
                Minutes = ((stats.dwConnectionDuration / 1000) / 60) - (Hours * 60);
                Seconds = ((stats.dwConnectionDuration / 1000)) - (Minutes * 60) - (Hours * 3600);


                m_duration = Hours + " hours " + Minutes + " minutes " + Seconds + " secs";
                m_TX = stats.dwBytesXmited;
                m_RX = stats.dwBytesRcved;


                //}


            }
            else
            {
                m_connected = false;
            }


            int lpNames = 1;
            int entryNameSize = 0;
            int lpSize = 0;
            RasEntryName[] names = null;

            entryNameSize = Marshal.SizeOf(typeof(RasEntryName));
            lpSize = lpNames * entryNameSize;

            names = new RasEntryName[lpNames];
            names[0].dwSize = entryNameSize;

            uint retval = RAS.RasEnumEntries(null, null, names, ref lpSize, out lpNames);

            //if we have more than one connection, we need to do it again
            if (lpNames > 1)
            {
                names = new RasEntryName[lpNames];
                for (int i = 0; i < names.Length; i++)
                {
                    names[i].dwSize = entryNameSize;
                }

                retval = RAS.RasEnumEntries(null, null, names, ref lpSize, out lpNames);

            }
            m_ConnectionNames = new string[names.Length];


            if (lpNames > 0)
            {
                for (int i = 0; i < names.Length; i++)
                {

                    m_ConnectionNames[i] = names[i].szEntryName;

                }
            }
        }

        public string Duration
        {
            get
            {
                return m_connected ? m_duration : "";
            }
        }

        public string[] Connections
        {
            get
            {
                return m_ConnectionNames;
            }
        }

        public double BytesTransmitted
        {
            get
            {
                return m_connected ? m_TX : 0;
            }
        }
        public double BytesReceived
        {
            get
            {
                return m_connected ? m_RX : 0;

            }
        }
        public string ConnectionName
        {
            get
            {
                return m_connected ? m_ConnectionName : "";
            }
        }
        public bool IsConnected
        {
            get
            {
                return m_connected;
            }
        }

        public int Connect(string Connection)
        {
            int temp = 0;
            uint INTERNET_AUTO_DIAL_UNATTENDED = 2;
            int retVal = RAS.InternetDial(IntPtr.Zero, Connection, INTERNET_AUTO_DIAL_UNATTENDED, ref temp, 0);
            return retVal;
        }
        public void Disconnect()
        {
            RAS.RasHangUp(m_ConnectedRasHandle);
        }
    }
}

别人的代码，貌似网上好多 都是复制的 这段 代码 ，但是 我的 win7 64位下无法拨号，请看看怎么改

[sexfio]

Connect 函数返回0 成功 但是实际上没有拨号

[threenewbee]

看下你的dll函数的名字和dll导出的是否一致