查詢 arp列表，獲取網關mac

// testArp.cpp : 定義控制檯應用程序的入口點。
//

#include "stdafx.h"
#include <windows.h>
#include <Iphlpapi.h>
#include <Iprtrmib.h>
#include <vector>


int _tmain(int argc, _TCHAR* argv[])
{
	ULONG uSize = 0;
	PMIB_IPNETTABLE pIpNetTable = nullptr;
	DWORD dwRet = GetIpNetTable(pIpNetTable, &uSize, false);
	if (dwRet == ERROR_INSUFFICIENT_BUFFER)
	{
		pIpNetTable = (PMIB_IPNETTABLE)malloc(uSize);
		if (NO_ERROR == GetIpNetTable(pIpNetTable, &uSize, false))
		{
			PMIB_IPNETROW pIpNetRow = pIpNetTable->table;
			in_addr inaddr;
			for (int k = 0; k < pIpNetTable->dwNumEntries; ++k)
			{
				
				char szIp[32] = "",szMac[64] = "";
				//IP地址
				inaddr.S_un.S_addr = pIpNetRow[k].dwAddr;
				strcpy(szIp, inet_ntoa(inaddr));

				//過濾Mac爲空的
				if (pIpNetRow[k].dwPhysAddrLen <= 0) continue;
				UCHAR bPhysAddr[MAXLEN_PHYSADDR] = { 0 };
				if (0 == memcmp(pIpNetRow[k].bPhysAddr, bPhysAddr, pIpNetRow[k].dwPhysAddrLen)) continue;
				//MAC地址
				for (int j = 0; j < pIpNetRow[k].dwPhysAddrLen; j++)
				{
					if (lstrcmp(szMac,"") == 0)
						sprintf(szMac, "%02x", pIpNetRow[k].bPhysAddr[j]);
					else
						sprintf(szMac, "%s-%02x",szMac, pIpNetRow[k].bPhysAddr[j]);
				}

				char szBuf[1024] = "";

				sprintf(szBuf, "%s--------%s\r\n", szIp, szMac);
				printf(szBuf);
			}
		}
	}
	return 0;
}

通過arp列表就可以獲取對應網關mac