Thread: Gateway Address

  1. #1
    Registered User
    Join Date
    Sep 2004

    Question Gateway Address


    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

  2. #2
    Yes, my avatar is stolen anonytmouse's Avatar
    Join Date
    Dec 2002
    You can use GetAdaptersInfo. Here is a sample, error checking is omitted.
    #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 = pAdapter->Next;
    	return 0;

  3. #3
    Registered User
    Join Date
    Sep 2004
    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?

  4. #4
    Registered User Codeplug's Avatar
    Join Date
    Mar 2003
    You need to download the latest Platform SDK.

    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


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