在C中获取SubnetMask

#include <winsock2.h>
#include <iphlpapi.h>
#include <stdio.h>
#include <stdlib.h>
#pragma comment(lib,"IPHLPAPI.lib")

#define MALLOC(X) HeapAlloc(GetProcessHeap(),(X))
#define FREE(X) HeapFree(GetProcessHeap(),(X))

/* Note: Could also use malloc() and free() */

int __cdecl main()
{

    PIP_ADAPTER_INFO pAdapterInfo;
    ULONG ulOutBufLen = sizeof (IP_ADAPTER_INFO);
    pAdapterInfo = (IP_ADAPTER_INFO *) MALLOC(sizeof (IP_ADAPTER_INFO));
    GetAdaptersInfo(pAdapterInfo,&ulOutBufLen);
    printf("\tIP Mask: \t%s\n",pAdapterInfo->IpaddressList.IpMask.String);
    }
    if (pAdapterInfo)
        FREE(pAdapterInfo);

    return 0;
}