c#自动ADSL拨号代码

鉴于网上搜索的c#拨号代码总是会弹出拨号连接的界面，基本等于无用，现在给出一段代码，经过本人的调试，完全可以实现自动ADSL拨号，昨夜测试完成后，不敢独享。具体用途，各位自己决定吧

        public uint Connect(string EntryName, string UserName, string Password, out IntPtr RasConn)
        {
            uint retVal;
            uint r=0;
            RasConn=IntPtr.Zero;
            byte[] bRASDIALPARAMS =new byte[1464];
            fixed (byte* pAddr = bRASDIALPARAMS)
            {
                byte* pCurrent = pAddr;
                Marshal.WriteInt32((IntPtr)pCurrent, bRASDIALPARAMS.Length);
                pCurrent += 4;
                foreach (byte b in Encoding.Unicode.GetBytes(EntryName))
                {
                    Marshal.WriteByte((IntPtr)pCurrent, b);
                    pCurrent++;
                }
                pCurrent = pAddr + 0x192;//0x192 - offset for RASDIALPARAMS.UserName
                foreach (byte b in Encoding.Unicode.GetBytes(UserName))
                {
                    Marshal.WriteByte((IntPtr)pCurrent, b);
                    pCurrent++;
                }
                pCurrent = pAddr + 0x394;//0x394 - offset for RASDIALPARAMS.Password
                foreach (byte b in Encoding.Unicode.GetBytes(Password))
                {
                    Marshal.WriteByte((IntPtr)pCurrent, b);
                    pCurrent++;
                }
                retVal = RAS.RasDial(IntPtr.Zero, IntPtr.Zero, (IntPtr)pAddr, 0, IntPtr.Zero, ref RasConn);
            }

            return retVal;
        }

代码中使用了指针，因此，需要在编译的时候添加/unsafe编译选项，RasDial可以在rasapi32.dll中找到，需要做一下封送和接口定义

        [DllImport("rasapi32.dll", CharSet = CharSet.Auto)]
        public extern static uint RasDial(
            IntPtr dialExtensions,
            IntPtr phoneBookPath,
            IntPtr rasDialParam,
            uint NotifierType,
            IntPtr notifier,
            ref IntPtr pRasConn
            );