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 = 0;

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

    char **pAlias;
    iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
    if (iResult != 0) {
        printf("WSAStartup failed: %d
", iResult);
        return 1;
    }

    host_name = new char[100];
    int index = gethostname(host_name,strlen(host_name));
    if (0 != index)
    {
        printf("Error
");
    }

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

    if (remoteHost == NULL) {
        dwError = WSAGetLastError();
        if (dwError != 0) {
            if (dwError == WSAHOST_NOT_FOUND) {
                printf("Host not found
");
                return 1;
            } else if (dwError == WSANO_DATA) {
                printf("No data record found
");
                return 1;
            } else {
                printf("Function failed with error: %ld
", dwError);
                return 1;
            }
        }
    } else {
        printf("Function returned:
");
        printf("	Official name: %s
", remoteHost->h_name);
        for (pAlias = remoteHost->h_aliases; *pAlias != 0; pAlias++) {
            printf("	Alternate name #%d: %s
", ++i, *pAlias);
        }
        printf("	Address type: ");
        switch (remoteHost->h_addrtype) {
        case AF_INET:
            printf("AF_INET
");
            break;
        case AF_NETBIOS:
            printf("AF_NETBIOS
");
            break;
        default:
            printf(" %d
", remoteHost->h_addrtype);
            break;
        }
        printf("	Address length: %d
", remoteHost->h_length);

        i = 0;
        if (remoteHost->h_addrtype == AF_INET)
        {
            while (remoteHost->h_addr_list[i] != 0) {
                addr.s_addr = *(u_long *) remoteHost->h_addr_list[i++];
                printf("	IP Address #%d: %s
", i, inet_ntoa(addr));
            }
        }
        else if (remoteHost->h_addrtype == AF_NETBIOS)
        {   
            printf("NETBIOS address was returned
");
        }   
    }

    return 0;
}