Gateway Address

Hi,

I am writing a newtowrk application that needs to obtain the local machines IP address, Gateway address and subnet mask.

I can get the locl IP using gethostbyname(), but I need help, with examples if possible.

1) How can I get the gateway address?

2) How can I get the Subnet Mask?

I have used netsh in the past, If this is the answer then how do I get the addresses into variables that I can use to display the addresses in controls.

Many Thanks

You can use GetAdaptersInfo. Here is a sample, error checking is omitted.

Code:

#include <windows.h>
#include <Iphlpapi.h>
#include <stdio.h>
#include <stdlib.h>
#pragma comment(lib, "Iphlpapi.lib")

int main(void)
{
	ULONG            cbBuf    = 0;
	PIP_ADAPTER_INFO pAdapter = NULL;
	PIP_ADAPTER_INFO pMemory  = NULL;
	DWORD            dwResult = 0;

	dwResult = GetAdaptersInfo(NULL, &cbBuf);

	pMemory = pAdapter = (PIP_ADAPTER_INFO) malloc(cbBuf);

	dwResult = GetAdaptersInfo(pAdapter, &cbBuf);

	while (pAdapter)
	{
		printf("Name: %s\nDescription: %s\nGateway: %s\nSubnet Mask: %s\n",
	               pAdapter->AdapterName,
		       pAdapter->Description,
		       pAdapter->GatewayList.IpAddress.String,
		       pAdapter->IpAddressList.IpMask.String);

		pAdapter = pAdapter->Next;
	}

	free(pMemory);

	getchar();
	return 0;
}

Many Thanks, but

I am using MS Visual C++ 6.0

The function GetAdaptersInfo is not included nor is the header file Iphlpapi.h

Is there a VC++ way or where can I get the required Iphlpapi.h file?

You need to download the latest Platform SDK.

http://www.microsoft.com/msdownload/...sdk/sdkupdate/

Click on "Core SDK" on the left then "Install this SDK" on the right.

Once installed, you'll need to add new "Include files" and "Library files" directories in VC++ 6.0: Tools -> Options -> Directories tab

gg