Re: Monitoring Dailup Connection just like ICQ

[Mark Snelling]

Here's a quick class I made up to handle this kind of thing.

Just create a CRASConnection object (defined below), call

CRASConnection::Refresh()

then check if there is an active connection using the

CRASConnection ::IsConnected()

member function which returns TRUE if there is a connected RAS session.

I hope this helps!

Mark Snelling

mark@bakedbeans.com

PS: if you can improve this in any way, could you send the updated file back to me? thanks :)

// RASConnection.h: interface for the CRASConnection class.

//

//////////////////////////////////////////////////////////////////////

#if !defined(AFX_RASCONNECTION_H__272696F1_CB23_11D2_914C_0040052AB9BC__INCLUDED_)

#define AFX_RASCONNECTION_H__272696F1_CB23_11D2_914C_0040052AB9BC__INCLUDED_

#if _MSC_VER > 1000

#pragma once

#endif // _MSC_VER > 1000

#include <ras.h>

#include <raserror.h>

class CRASConnection

{

public:

DWORD Refresh();

BOOL IsConnected();

CRASConnection();

virtual ~CRASConnection();

private:

DWORD m_cConn;

LPHRASCONN m_lphRasConn;

LPRASCONN m_lpRasConn;

RASCONNSTATUS m_RasStatus;

};

#endif // !defined(AFX_RASCONNECTION_H__272696F1_CB23_11D2_914C_0040052AB9BC__INCLUDED_)

// RASConnection.cpp: implementation of the CRASConnection class.

//

//////////////////////////////////////////////////////////////////////

#include "stdafx.h"

#include "RASConnection.h"

#pragma message("library is linking with \"rasapi32.lib\"")

#pragma comment(lib, "rasapi32.lib")

#ifdef _DEBUG

#undef THIS_FILE

static char THIS_FILE[]=__FILE__;

#define new DEBUG_NEW

#endif

//////////////////////////////////////////////////////////////////////

// Construction/Destruction

//////////////////////////////////////////////////////////////////////

CRASConnection::CRASConnection()

{

// Allocate memory for RAS connection information array

m_lpRasConn = (LPRASCONN)malloc(sizeof(RASCONN));

// Allocate memory for RAS connection handle array

m_lphRasConn = (LPHRASCONN)malloc(sizeof(HRASCONN));

// Set 'dwSize' attribute to reflect structure version

m_RasStatus.dwSize = sizeof(RASCONNSTATUS);

}

CRASConnection::~CRASConnection()

{

if (m_lpRasConn)

free(m_lpRasConn);

if (m_lphRasConn)

free(m_lphRasConn);

}

DWORD CRASConnection::Refresh()

{

DWORD ret = 0;

DWORD dwStatus = 0;

DWORD cbBuf = 0;

DWORD ndx = 0;

// Temporary pointers for memory reallocation

LPRASCONN lpTemp = NULL;

LPHRASCONN lphTemp = NULL;

cbBuf = sizeof(RASCONN);

// Set size parameter to let 'RasEnumConnections' know version of struct

m_lpRasConn->dwSize = sizeof(RASCONN);

// Attempt to get RAS connection details

dwStatus = RasEnumConnections(m_lpRasConn, &cbBuf, &m_cConn);

// Check if array is large enough

if (dwStatus == ERROR_BUFFER_TOO_SMALL)

{

// Reallocate memory for RAS connection information array

lpTemp = (LPRASCONN)realloc(m_lpRasConn, cbBuf);

// Was the memory reallocated??

if (lpTemp == NULL)

ret = -1;

m_lpRasConn = lpTemp;

// Call function again with correct array size

dwStatus = RasEnumConnections(m_lpRasConn, &cbBuf, &m_cConn);

// Reallocate memory for RAS connection handle array

lphTemp = (LPHRASCONN)realloc(m_lphRasConn, sizeof(HRASCONN) * m_cConn);

// Was the memory reallocated??

if (lphTemp == NULL)

ret = -1;

m_lphRasConn = lphTemp;

}

if (ret == 0)

{

// Populate connection handle array

for (ndx = 0; ndx < m_cConn; ndx++)

m_lphRasConn[ndx] = m_lpRasConn[ndx].hrasconn;

}

// Return status

return ret;

}

BOOL CRASConnection::IsConnected()

{

// Set default connection state

BOOL ret = FALSE;

// Check if there is a connection

if (m_cConn != NULL)

{

// Get connection status for eaqch connection

for (DWORD ndx = 0; ndx < m_cConn; ndx++)

{

RasGetConnectStatus(m_lpRasConn[ndx].hrasconn , &m_RasStatus);

// Check status of connection

if (m_RasStatus.rasconnstate == RASCS_Connected)

{

// We have a valid connection!

ret = TRUE;

}

}

}


// Return connection status

return ret;

}