代码如下：
1 #include "winsock2.h" 2 #include "iphlpapi.h" //For SendARP 3 #include "stdio.h" 4 #include "conio.h" 5 6 #pragma comment(lib , "iphlpapi.lib") //For iphlpapi 7 #pragma comment(lib , "ws2_32.lib") //For winsock 8 9 void GetMacAddress(unsigned char * , struct in_addr ); 10 11 int main() 12 { 13 unsigned char mac[6]; 14 struct in_addr srcip; 15 char ip_address[32]; 16 17 WSADATA firstsock; 18 19 if (WSAStartup(MAKEWORD(2,2),&firstsock) != 0) 20 { 21 printf(" Failed to initialise winsock."); 22 printf(" Error Code : %d" , WSAGetLastError() ); 23 return 1; 24 } 25 26 //Ask user to select the device he wants to use 27 printf("Enter the ip address : "); 28 scanf("%s",ip_address); 29 srcip.s_addr = inet_addr(ip_address); 30 31 //Get mac addresses of the ip 32 GetMacAddress(mac , srcip); 33 printf("Selected device has mac address : %.2X-%.2X-%.2X-%.2X-%.2X-%.2X",mac[0],mac[1],mac[2],mac[3],mac[4],mac[5]); 34 printf(" "); 35 printf("Press any key to exit "); 36 37 _getch(); 38 return 0; 39 } 40 41 /* 42 Get the mac address of a given ip 43 */ 44 void GetMacAddress(unsigned char *mac , struct in_addr destip) 45 { 46 DWORD ret; 47 IPAddr srcip; 48 ULONG MacAddr[2]; 49 ULONG PhyAddrLen = 6; /* default to length of six bytes */ 50 int i; 51 52 srcip = 0; 53 54 //Send an arp packet 55 ret = SendARP((IPAddr) destip.S_un.S_addr , srcip , MacAddr , &PhyAddrLen); 56 57 //Prepare the mac address 58 if(PhyAddrLen) 59 { 60 BYTE *bMacAddr = (BYTE *) & MacAddr; 61 for (i = 0; i < (int) PhyAddrLen; i++) 62 { 63 mac[i] = (char)bMacAddr[i]; 64 } 65 } 66 }