请教一个关于网络编程中sendarp的问题？

Question

如下，想实现如何获得指定ip地址的mac地址。
我在codeblocks下运行，出现如下报错：
error: cannot convert 'ULONG (*)[2] {aka long unsigned int (*)[2]}' to 'PULONG {aka long unsigned int*}' for argument '3' to 'DWORD SendARP(IPAddr, IPAddr, PULONG, PULONG)'|

Error: SendArp failed with error: %d", dwRetVal);|
想请教一下，这个是哪里出了问题。谢谢各位。

#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif

#include <winsock2.h>
#include <iphlpapi.h>
#include <stdio.h>
#include <stdlib.h>
#include <bits/stdc++.h>

#pragma comment(lib, "iphlpapi.lib")
#pragma comment(lib, "ws2_32.lib")

void usage(char *pname)
{
    printf("Usage: %s [options] ip-address\n", pname);
    printf("\t -h \t\thelp\n");
    printf("\t -l length \tMAC physical address length to set\n");
    printf("\t -s src-ip \tsource IP address\n");
    exit(1);
}

int __cdecl main(int argc, char **argv)
{
    DWORD dwRetVal;
    IPAddr DestIp = 0;
    IPAddr SrcIp = 0;       /* default for src ip */
    ULONG MacAddr[2];       /* for 6-byte hardware addresses */
    ULONG PhysAddrLen = 6;  /* default to length of six bytes */

    char *DestIpString = NULL;
    char *SrcIpString = NULL;

    BYTE *bPhysAddr;
    unsigned int i;

    if (argc > 1) {
        for (i = 1; i < (unsigned int) argc; i++) {
            if ((argv[i][0] == '-') || (argv[i][0] == '/')) {
                switch (tolower(argv[i][1])) {
                case 'l':
                    PhysAddrLen = (ULONG) atol(argv[++i]);
                    break;
                case 's':
                    SrcIpString = argv[++i];
                    SrcIp = inet_addr(SrcIpString);
                    break;
                case 'h':
                default:
                    usage(argv[0]);
                    break;
                }               /* end switch */
            } else
                DestIpString = argv[i];
        }                       /* end for */
    } else
        usage(argv[0]);

    if (DestIpString == NULL || DestIpString[0] == '\0')
        usage(argv[0]);

    DestIp = inet_addr(DestIpString);

    memset(&MacAddr, 0xff, sizeof (MacAddr));

    printf("Sending ARP request for IP address: %s\n", DestIpString);

    dwRetVal = SendARP(DestIp, SrcIp, &MacAddr, &PhysAddrLen);

    if (dwRetVal == NO_ERROR) {
        bPhysAddr = (BYTE *) & MacAddr;
        if (PhysAddrLen) {
            for (i = 0; i < (int) PhysAddrLen; i++) {
                if (i == (PhysAddrLen - 1))
                    printf("%.2X\n", (int) bPhysAddr[i]);
                else
                    printf("%.2X-", (int) bPhysAddr[i]);
            }
        } else
            printf
                ("Warning: SendArp completed successfully, but returned length=0\n");

    } else {
        printf("Error: SendArp failed with error: %d", dwRetVal);
        switch (dwRetVal) {
        case ERROR_GEN_FAILURE:
            printf(" (ERROR_GEN_FAILURE)\n");
            break;
        case ERROR_INVALID_PARAMETER:
            printf(" (ERROR_INVALID_PARAMETER)\n");
            break;
        case ERROR_INVALID_USER_BUFFER:
            printf(" (ERROR_INVALID_USER_BUFFER)\n");
            break;
        case ERROR_BAD_NET_NAME:
            printf(" (ERROR_GEN_FAILURE)\n");
            break;
        case ERROR_BUFFER_OVERFLOW:
            printf(" (ERROR_BUFFER_OVERFLOW)\n");
            break;
        case ERROR_NOT_FOUND:
            printf(" (ERROR_NOT_FOUND)\n");
            break;
        default:
            printf("\n");
            break;
        }
    }

    return 0;
}