Capturing IP Address

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

Thanx for any kind of help.

Regards,
shail2k4

Quote:

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Originally Posted by shail2k4

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

Thanx for any kind of help.

Regards,
shail2k4

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How to get the local IP address(es)

Doesn't GetIpAddrTable work?
GetIpAddrTable

Do you want the internal or external IP's?

Also see GetAdaptersInfo and GetAdaptersAddresses.

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>

Code:

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// 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

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