C#写的ADSL拨号程序示例

    [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;
        }
    }