code example for ADSL dialer written in C # _c# tutorial

<!--STARTFRAGMENT--&GT;ADSL Automatic dialing class, provided that a broadband dial-up connection is already in the system
Calling code:
Rasdisplay ras = new Rasdisplay ();
Ras. Disconnect ()//disconnection
Ras. Connect ("ADSL");/dial

Copy Code code as follows:

Using System;
Using System.Runtime.InteropServices;
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 ("Ra<a href=" http://dev.21tx.com/corp/sap/"target=" _blank ">sap</a>i32.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//type to delete.
{
file,//represents temporary Internet files
Cookies//Representations Cookies
};
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 *)-(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 and 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);
}
}