GetAdaptersAddresses and IP

[ehmano]

i m using GetAdaptersAddresses to retrieve info from my interfaces but i can not figure out how to get the corresponding IP address !!

Wher should i look into IP_ADAPTER_ADDRESSES to get this **** IP and the subnet and gateway,
it must be possible ??

[Guido Niewerth]

Have a look at GetAdaptersInfo. GetAdaptersInfo fills a buffer with a linked list of IP_ADAPTER_INFO structures, the only thing you have to do is provide enough space and walk the list. I´m not sure if you can determine the subnet mask this way.

Hope this helps,
Guido

[ehmano]

i already tried that one and it doesn't work, because i'm on XP.
This function gives bugs with XP and server 2003.
thanks for ur reply anyway.

[Andreas Masur]

[Moved thread]

[Jim Mcpherson]

//code

DWORD GetNetworkLanIndex()
{
PIP_ADAPTER_INFO pAdapterInfo = NULL;
PIP_ADAPTER_INFO pOriginalPtr;
ULONG ulSizeAdapterInfo = 0;
DWORD dwStatus=0;
DWORD dwLanIndex=0;

// Find out how big our buffer needs to be to hold
// the data
dwStatus = GetAdaptersInfo(pAdapterInfo, &ulSizeAdapterInfo);
if(dwStatus == ERROR_BUFFER_OVERFLOW)
{
// Allocate a buffer of the appropriate size
if(!(pAdapterInfo = (PIP_ADAPTER_INFO)malloc(ulSizeAdapterInfo)))
{
// Insufficient memory
return 0;
}

// Obtain the Adapter Info
dwStatus = GetAdaptersInfo(pAdapterInfo, &ulSizeAdapterInfo);
}

if(dwStatus != ERROR_SUCCESS)
{
if(pAdapterInfo)
free(pAdapterInfo);
return 0;
}

pOriginalPtr = pAdapterInfo;

if(pOriginalPtr == NULL)
{
//printf("\n No Interfaces Present.\n");
if(pAdapterInfo)
free(pAdapterInfo);
return 0;
}
// Step through the adapter list
while (pOriginalPtr != NULL)
{
// Print the Ip Addresses
//printf(" \n\n\t IpAddressList:: ");
PIP_ADDR_STRING pAddressList =
&(pOriginalPtr->IpAddressList);
dwLanIndex = pOriginalPtr->Index;
//if(dwLanIndex>0)
// break;

do
{
//printf("\n\t IpAddress = %hs", pAddressList->IpAddress.String);
pAddressList = pAddressList->Next;
} while (pAddressList != NULL);

// And so on with other members of the Adapter info structure…..

pOriginalPtr = pOriginalPtr->Next;
} // while(pOriginalPtr!=NULL){

if(pAdapterInfo)
free(pAdapterInfo);

return dwLanIndex;
}

//code