G
Guest
Hi everybody,
I found this code but unable to make it work. I like to create a Remote
access service using VPN Network connection in order I could interact with
remote database. I like to created a fixed link to a remote server with
default username and password. With this code, still unable to connect to
remote server as verified if internet connection is ok. Is there anyone who
can help me fixed thia problem? I need help. Thanks.
This inside main class
Inside another class
Inside class checking internet connection
denpsia
I found this code but unable to make it work. I like to create a Remote
access service using VPN Network connection in order I could interact with
remote database. I like to created a fixed link to a remote server with
default username and password. With this code, still unable to connect to
remote server as verified if internet connection is ok. Is there anyone who
can help me fixed thia problem? I need help. Thanks.
This inside main class
Code:
public void Dial()
{
if(_Handle!=IntPtr.Zero)
{
RASCONNSTATUS status=new RASCONNSTATUS();
uint res=RasAPI.RasGetConnectStatus(_Handle,status);
if(res==ERROR_INVALID_HANDLE) //res=ERROR_INVALID_HANDLE
_Handle=IntPtr.Zero;
else
return;
}
try
{
this._Params.szPhoneNumber = "<server ip>";
this._Params.szUserName = "<username>";
this._Params.szPassword = "dennispt200508";
RasAPI.RasCheck(RasAPI.RasDial(null,_Phonebook,_Params,1,_DialNotifyDelegate,ref _Handle));
RasAPI.RasConnectionNotification(_Handle,this._DisconnEvent.Handle,RASNOTIFICATION.RASCN_Disconnection);
RasAPI.RasDial(null,@"C:\Documents and Settings\All
Users\Application
Data\Microsoft\Network\Connections\Pbk\rasphone.pbk",_Params,1,_DialNotifyDelegate,ref _Handle);
StartWatch();
if (ConnectionState.IsModemConnected())
this.statusSend("Connected to 203.201.133.64");
else
this.statusSend("Unable to connect.");
}
catch(Exception e)
{
}
}
private void StartWatch()
{
StopWatch();
this._WatchThread=new Thread(new ThreadStart(RunWatch));
this._WatchThread.Start();
}
private void StopWatch()
{
if(this._WatchThread==null)
return;
if(this._WatchThread.IsAlive)
{
this._StopEvent.Set();
this._WatchThread.Join();
}
this._WatchThread=null;
}
private void RunWatch()
{
WaitHandle[] handles=new
WaitHandle[]{this._StopEvent,this._DisconnEvent};
int ret;
this._StopEvent.Reset();
this._DisconnEvent.Reset();
while(true)
{
ret=WaitHandle.WaitAny(handles);
if(ret==0)
break;
if(ret==1)
{
this.OnDisconnected();
System.Diagnostics.Debug.WriteLine("Dis connected");
break;
}
}
}
private void OnConnected()
{
if(this.Connected==null)
return;
EventArgs args=new EventArgs();
if(this.SynchronizingObject!=null &&
this.SynchronizingObject.InvokeRequired)
{
this.SynchronizingObject.Invoke(Connected,new object[]{this,args});
}
else
{
Connected(this,args);
}
}
private void OnDisconnected()
{
if(this.Disconnected==null)
return;
EventArgs args=new EventArgs();
if(this.SynchronizingObject!=null &&
this.SynchronizingObject.InvokeRequired)
{
this.SynchronizingObject.Invoke(Disconnected,new object[]{this,args});
}
else
{
Disconnected(this,args);
}
}
private void OnDialNotify1(IntPtr hrasconn,uint unMsg,RASCONNSTATE
rascs,uint dwError,uint dwExtendedError)
{
if(this.DialNotify1==null)
return;
string msg="";
if(dwError>0)
{
// msg=RasException.Code2RasErrorMessage(dwError);
}
else
{
// msg=RasConnection.GetRasConnStateMessage(rascs);
msg = this.GetRasConnStateMessage(rascs);
}
RasDialNotify1EventArgs args=new
RasDialNotify1EventArgs(hrasconn,unMsg,rascs,dwError,dwExtendedError,msg);
if(this.SynchronizingObject!=null &&
this.SynchronizingObject.InvokeRequired)
{
this.SynchronizingObject.Invoke(DialNotify1,new object[]{this,args});
}
else
{
DialNotify1(this,args);
}
if(args.ConnectionState==RASCONNSTATE.RASCS_Connected)
OnConnected();
}
private string GetRasConnStateMessage(RASCONNSTATE state)
{
string ret="";
if(_Res!=null)
ret=(string)_Res.GetObject(state.ToString().Trim());
return ret;
}
[Browsable(false),Description("get or set SynchronizingObject")]
public ISynchronizeInvoke SynchronizingObject
{
get
{
if(_SynchronizingObject==null)
{
if(this.DesignMode)
{
IDesignerHost dh=this.GetService(typeof(IDesignerHost)) as
IDesignerHost;
if(dh!=null)
{
_SynchronizingObject=dh.RootComponent as ISynchronizeInvoke;
}
}
}
return _SynchronizingObject;
}
set
{
_SynchronizingObject=value;
}
}Inside another class
Code:
internal sealed class RasAPI
{
private RasAPI(){}
[DllImport("rasapi32.dll",CharSet=CharSet.Auto)]
public extern static uint RasDial(
[In]RASDIALEXTENSIONS lpRasDialExtensions,
// pointer to function extensions data
[In]string lpszPhonebook, // pointer to full path and file
// name of phone-book file
[In]RASDIALPARAMS lpRasDialParams,
// pointer to calling parameters data
uint dwNotifierType, // specifies type of RasDial event handler
Delegate lpvNotifier, // specifies a handler for RasDial events
ref IntPtr lphRasConn // pointer to variable to receive
// connection handle
);
[DllImport("rasapi32.dll",CharSet=CharSet.Auto)]
public extern static uint RasGetConnectStatus(
IntPtr hrasconn, // handle to RAS connection of interest
[In,Out]RASCONNSTATUS lprasconnstatus
// buffer to receive status data
);
[DllImport("rasapi32.dll",CharSet=CharSet.Auto)]
public extern static uint RasGetErrorString(
uint uErrorValue, // error to get string for
StringBuilder lpszErrorString, // buffer to hold error string
[In]int cBufSize // size, in characters, of buffer
);
[DllImport("rasapi32.dll",CharSet=CharSet.Auto)]
public extern static uint RasConnectionNotification(
IntPtr hrasconn, // handle to a RAS connection
IntPtr hEvent, // handle to an event object
RASNOTIFICATION dwFlags // type of event to receive notifications for
);
public static void RasCheck(uint errorCode)
{
if(errorCode!=(uint)RasError.SUCCESS)
{
// throw new RasException(errorCode);
StringBuilder sb=new StringBuilder(512);
if(RasAPI.RasGetErrorString(errorCode,sb,sb.Capacity)>0)
throw new Exception("Unknow RAS exception.");
// string ret=sb.ToString();
}
}
}Inside class checking internet connection
Code:
public class ConnectionState
{
private enum ConnectionStateEnum
{
//Local system has a valid connection to the Internet, but it might or
might not be currently connected.
ConnectionConfigured = 64,
//Local system uses a local area network to connect to the Internet.
ConnectionLan = 2,
//Local system uses a modem to connect to the Internet.
ConnectionModem = 1,
//No longer used.
ConnectionModemBusy = 8,
//Local system is in offline mode.
ConnectionOffline = 32,
//Local system uses a proxy server to connect to the Internet.
ConnectionProxy = 4,
//Local system has RAS installed.
RasInstalled = 16
}
class Win32
{
[DllImport("Wininet.dll", CharSet=CharSet.Auto)]
public static extern int InternetGetConnectedState(out int Flag, int
Reserved);
}
private static int GetConnectionFlag()
{
int Flag;
Win32.InternetGetConnectedState(out Flag,0);
return Flag;
}
public static bool IsModemConnected()
{
return ((GetConnectionFlag() &
(int)ConnectionStateEnum.ConnectionModem)==0) ?
false : true;
}
}denpsia