#include<Winsock2.h>
#include<stdio.h>
#include<windows.h>

#pragma comment("Ws2_32.lib")
typedef struct {  union {    struct {      u_char s_b1,s_b2,s_b3,s_b4;    } S_un_b;    struct {      u_short s_w1,s_w2;    } S_un_w;    u_long S_addr;  } S_un;
} IPAddr;

typedef DWORD(*REALSENDARP)(IPAddr DestIP,LONG SrcIP,PULONG pMacAddr,LONG PhyAddrLen);
  
  
  

REALSENDARP SendARP;
void main()
{
       

HRESULT hr;
    IPAddr  ipAddr;
    ULONG   pulMac[2];
    ULONG   ulLen;

    ipAddr = inet_addr ("192.168.25.31");
    memset (pulMac, 0xff, sizeof (pulMac));
    ulLen = 6;
   
    hr = SendARP (ipAddr, 0, pulMac, &ulLen);
    printf ("Return %08x, length %8d\n", hr, ulLen);
   
    size_t i, j;
    char * szMac = new char[ulLen*3];
    PBYTE pbHexMac = (PBYTE) pulMac;

    //
    // Convert the binary MAC address into human-readable
    //
    for (i = 0, j = 0; i < ulLen - 1; ++i) {
        j += sprintf (szMac + j, "%02X:", pbHexMac[i]);
    }
   
    sprintf (szMac + j, "%02X", pbHexMac[i]);
    printf ("MAC address %s\n", szMac);
   
    delete [] szMac;

    }
这段代码是在msdn上的，由于vc6没有iphlpapi.lib,所以我就动态调用sendarp,可是前面的inet_addr返回的是ULONG型的值，无法转化成IPAddr，编译老报错！，这是msdn上的代码，怎么回这样呢？？请高手帮忙解决！！

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