Capturing IP Address

[shail2k4]

How do i capture ip address of a machine having more than one ip?

Thanx for any kind of help.

Regards,
shail2k4

[jayender.vs]

How do i capture ip address of a machine having more than one ip?

Thanx for any kind of help.

Regards,
shail2k4

How to get the local IP address(es)

[VictorN]

Doesn't GetIpAddrTable work?
GetIpAddrTable

[Rehorav]

Do you want the internal or external IP's?

[cilu]

Also see GetAdaptersInfo and GetAdaptersAddresses.

[Cielak]

the code below is partly based on various internet resources, partly my own. simply call the methods, passing them parameters to store return values.
link: iphlpapi.lib
stdafx.h: #include <afxsock.h> // MFC socket extensions
global: #include <iphlpapi.h> // internet
#include <afxinet.h>

// determine all LAN IP addresses of this machine into CStringArray reference parameter
void FindLANIPAddresses( CStringArray & stringArray )
{
	const DWORD loopbackAddress = 16777343; // 127.0.0.1 - to be ignored
	struct in_addr  ipAddress;
	PMIB_IPADDRTABLE ipAddressTable = new MIB_IPADDRTABLE;
	ULONG size = 0;

	// determine the necessary size of ipAddressTable into 'size'
	if( GetIpAddrTable( ipAddressTable, &size, 0 ) == ERROR_INSUFFICIENT_BUFFER )
	{
		delete [] ipAddressTable;
		ipAddressTable = ( PMIB_IPADDRTABLE ) malloc( size );
	}

	// now 'size' is correct, so fill in ipAddressTable
	if(  GetIpAddrTable( ipAddressTable, &size, TRUE )  != NO_ERROR )
		return; // error
	
	// convert ip to string , get rid of blank and loopback entries
	DWORD tempIP;
	for( int i = 0; i < ( int )ipAddressTable->dwNumEntries; i++ )
	{
		tempIP = ipAddressTable->table[ i ].dwAddr;
		if( tempIP != 0 && tempIP != loopbackAddress )
		{			
			memmove ( &ipAddress, &tempIP, 4 );
			stringArray.Add( inet_ntoa ( ipAddress ) );
		}
	}

	delete [] ipAddressTable;

} // end FindLANIPAddresses


// determine WAN IP address of this machine or router/gateway into CString parameter
void FindWANIPAddress( CString & string )
{
	DWORD queryReturnValue = 0;
	CInternetSession *pSession = new CInternetSession(_T("GetIP number") );
	CHttpFile * pFile;

	try
	{
		pFile = ( CHttpFile * ) pSession->OpenURL( "http://checkip.dyndns.org/" );
	}

	catch (CInternetException* pEx)
	{
		pEx->Delete();
		pFile->Close();
		delete pFile;		
		delete pSession;	 	
		return;						// could not open URL
	}

	pFile->QueryInfoStatusCode(queryReturnValue);	

	if( queryReturnValue == 200 )	// Yes! - success status code: 200
	{			
		char * fileBuffer = new char[ 1024 ];
		char * originalFileBuffer = fileBuffer;
		char ipBuffer[ 16 ]; // holds extracted IP address
		pFile->Read( fileBuffer, 1024 ); // read first 1024 bytes of HTML.
		if ( fileBuffer )
		{
			int start = strcspn( fileBuffer, "1234567890" );
			fileBuffer += start;
			int end = strspn( fileBuffer, "0123456789." );
			strncpy( ipBuffer, fileBuffer, end );
			ipBuffer[ end ] = '\0';
			string = ipBuffer; // place IP number in passed parameter
		}
		delete [] originalFileBuffer;
	}

	pFile->Close();
	delete pFile;	
	delete pSession;
	
} // end FindWANIPAddress