C/C++获取本机名+本机IP+本机MAC

本机名、IP、MAC都是一些比较常用网络参数，怎么用C/C++获取呢？

研究了两三个小时...

需要说明的都在代码注释里

 #include <stdio.h>
 #include <Windows.h>
 #include <IPHlpApi.h>

 #pragma comment(lib,"ws2_32.lib")    // Socket静态库,取本机IP用
 #pragma comment(lib,"IPHlpApi.lib")    // 发送ARP报文要用的静态库,取MAC用

 /*
     取主机名
     成功返回主机名,失败返回NULL.
 */
 char *MyGetHostName(void);

 /*
     取本机IP
     成功返回本机IP,失败返回NULL.
 */
 char *MyGetHostIp(void);

 /*
     取本机MAC
     成功返回本机MAC,失败返回NULL.
 */
 char *MyGetHostMac(void);

 int main(void)
 {
     char *lpName = NULL;
     char *lpIp = NULL;
     char *lpMac = NULL;

     lpName = MyGetHostName();
     lpIp = MyGetHostIp();
     lpMac = MyGetHostMac();
     printf("PCName : %s\n", lpName);
     printf("IPAddr : %s\n", lpIp);
     printf("M A C  : %s\n", lpMac);

     free(lpName);
     free(lpIp);
     free(lpMac);
     system("pause");
     return ;
 }

 char *MyGetHostName(void)
 {
     char *lpName = NULL;
     DWORD dwLen = ;

     GetComputerName(NULL, &dwLen);
     lpName = (char *)malloc(dwLen);
     memset(lpName, , dwLen);
     GetComputerName(lpName, &dwLen);
     return (lpName ? lpName : NULL);
 }

 char *MyGetHostIp(void)
 {
     char *ip = NULL;
     WSADATA wsaData = {  };
     struct hostent *phostinfo = NULL;

     ip = (char *)malloc(sizeof(char)* );
     memset(ip, , );
     WSAStartup(MAKEWORD(, ), &wsaData);
     phostinfo = gethostbyname("");
     lstrcpyn(ip, inet_ntoa(*(struct in_addr *)(*phostinfo->h_addr_list)), );
     WSACleanup();
     if (ip)
     {
         return ip;
     }
     else {
         free(ip);
         return NULL;
     }
 }

 char *MyGetHostMac(void)
 {
     IPAddr ip = inet_addr(MyGetHostIp());
     PVOID *pMac = NULL;
     ULONG MacAddr[] = {  };    // Mac地址长度6字节
     ULONG uMacSize = ;

     // 通过ARP报文响应获取MAC地址
     DWORD dwRet = SendARP(ip, , &MacAddr, &uMacSize);
     if (dwRet == NO_ERROR)
     {
         BYTE *bPhyAddr = (BYTE *)MacAddr;

         if (uMacSize)
         {
             char *sMac = (char *)malloc(sizeof(char)* );
             int n = ;

             memset(sMac, , );
             sprintf_s(sMac, (size_t), "%.2X-%.2X-%.2X-%.2X-%.2X-%.2X", (int)bPhyAddr[], (int)bPhyAddr[], (int)bPhyAddr[], (int)bPhyAddr[], (int)bPhyAddr[], (int)bPhyAddr[]);
             return sMac;
         }
         else
         {
             printf("Mac地址获取失败！\n");
         }
     }
     else
     {
         printf("ARP报文发送失败:%d\n",dwRet);
     }
     return NULL;
 }

效果图：