C++获取本机IP等信息

运行环境：VS2008，win7，代码来源于MSDN，相关函数可以查看MSDN中的函数定义。。

代码如下：

 #include <winsock2.h>
 #include <ws2tcpip.h>
 #include <stdio.h>
 #include <windows.h>
 #pragma comment(lib, "ws2_32.lib")

 int main(int argc, char **argv)
 {

     //-----------------------------------------
     // Declare and initialize variables
     WSADATA wsaData;
     int iResult;

     DWORD dwError;
     int i = ;

     struct hostent *remoteHost;
     char *host_name;
     struct in_addr addr;

     char **pAlias;
     iResult = WSAStartup(MAKEWORD(, ), &wsaData);
     if (iResult != ) {
         printf("WSAStartup failed: %d\n", iResult);
         return ;
     }

     host_name = new char[];
     int index = gethostname(host_name,strlen(host_name));
     if ( != index)
     {
         printf("Error\n");
     }

     printf("Calling gethostbyname with %s\n", host_name);
     remoteHost = gethostbyname(host_name);

     if (remoteHost == NULL) {
         dwError = WSAGetLastError();
         if (dwError != ) {
             if (dwError == WSAHOST_NOT_FOUND) {
                 printf("Host not found\n");
                 return ;
             } else if (dwError == WSANO_DATA) {
                 printf("No data record found\n");
                 return ;
             } else {
                 printf("Function failed with error: %ld\n", dwError);
                 return ;
             }
         }
     } else {
         printf("Function returned:\n");
         printf("\tOfficial name: %s\n", remoteHost->h_name);
         for (pAlias = remoteHost->h_aliases; *pAlias != ; pAlias++) {
             printf("\tAlternate name #%d: %s\n", ++i, *pAlias);
         }
         printf("\tAddress type: ");
         switch (remoteHost->h_addrtype) {
         case AF_INET:
             printf("AF_INET\n");
             break;
         case AF_NETBIOS:
             printf("AF_NETBIOS\n");
             break;
         default:
             printf(" %d\n", remoteHost->h_addrtype);
             break;
         }
         printf("\tAddress length: %d\n", remoteHost->h_length);

         i = ;
         if (remoteHost->h_addrtype == AF_INET)
         {
             while (remoteHost->h_addr_list[i] != ) {
                 addr.s_addr = *(u_long *) remoteHost->h_addr_list[i++];
                 printf("\tIP Address #%d: %s\n", i, inet_ntoa(addr));
             }
         }
         else if (remoteHost->h_addrtype == AF_NETBIOS)
         {
             printf("NETBIOS address was returned\n");
         }
     }

     return ;
 }