MSDN例子 获取网卡、ip等信息

#include <winsock2.h>#include <iphlpapi.h>#include <stdio.h>#include <stdlib.h>#pragma comment(lib, "IPHLPAPI.lib")#define MALLOC(x) HeapAlloc(GetProcessHeap(), 0, (x))#define FREE(x) HeapFree(GetProcessHeap(), 0, (x))/* Note: could also use malloc() and free() */int __cdecl main(){    /* Declare and initialize variables */// It is possible for an adapter to have multiple// IPv4 addresses, gateways, and secondary WINS servers// assigned to the adapter. //// Note that this sample code only prints out the // first entry for the IP address/mask, and gateway, and// the primary and secondary WINS server for each adapter.     PIP_ADAPTER_INFO pAdapterInfo;    PIP_ADAPTER_INFO pAdapter = NULL;    DWORD dwRetVal = 0;    UINT i;/* variables used to print DHCP time info */    struct tm newtime;    char buffer[32];    errno_t error;    ULONG ulOutBufLen = sizeof (IP_ADAPTER_INFO);    pAdapterInfo = (IP_ADAPTER_INFO *) MALLOC(sizeof (IP_ADAPTER_INFO));    if (pAdapterInfo == NULL) {        printf("Error allocating memory needed to call GetAdaptersinfo\n");        return 1;    }// Make an initial call to GetAdaptersInfo to get// the necessary size into the ulOutBufLen variable    if (GetAdaptersInfo(pAdapterInfo, &ulOutBufLen) == ERROR_BUFFER_OVERFLOW) {        FREE(pAdapterInfo);        pAdapterInfo = (IP_ADAPTER_INFO *) MALLOC(ulOutBufLen);        if (pAdapterInfo == NULL) {            printf("Error allocating memory needed to call GetAdaptersinfo\n");            return 1;        }    }    if ((dwRetVal = GetAdaptersInfo(pAdapterInfo, &ulOutBufLen)) == NO_ERROR) {        pAdapter = pAdapterInfo;        while (pAdapter) {            printf("\tComboIndex: \t%d\n", pAdapter->ComboIndex);            printf("\tAdapter Name: \t%s\n", pAdapter->AdapterName);            printf("\tAdapter Desc: \t%s\n", pAdapter->Description);            printf("\tAdapter Addr: \t");            for (i = 0; i < pAdapter->AddressLength; i++) {                if (i == (pAdapter->AddressLength - 1))                    printf("%.2X\n", (int) pAdapter->Address[i]);                else                    printf("%.2X-", (int) pAdapter->Address[i]);            }            printf("\tIndex: \t%d\n", pAdapter->Index);            printf("\tType: \t");            switch (pAdapter->Type) {            case MIB_IF_TYPE_OTHER:                printf("Other\n");                break;            case MIB_IF_TYPE_ETHERNET:                printf("Ethernet\n");                break;            case MIB_IF_TYPE_TOKENRING:                printf("Token Ring\n");                break;            case MIB_IF_TYPE_FDDI:                printf("FDDI\n");                break;            case MIB_IF_TYPE_PPP:                printf("PPP\n");                break;            case MIB_IF_TYPE_LOOPBACK:                printf("Lookback\n");                break;            case MIB_IF_TYPE_SLIP:                printf("Slip\n");                break;            default:                printf("Unknown type %ld\n", pAdapter->Type);                break;            }            printf("\tIP Address: \t%s\n",                   pAdapter->IpAddressList.IpAddress.String);            printf("\tIP Mask: \t%s\n", pAdapter->IpAddressList.IpMask.String);            printf("\tGateway: \t%s\n", pAdapter->GatewayList.IpAddress.String);            printf("\t***\n");            if (pAdapter->DhcpEnabled) {                printf("\tDHCP Enabled: Yes\n");                printf("\t  DHCP Server: \t%s\n",                       pAdapter->DhcpServer.IpAddress.String);                printf("\t  Lease Obtained: ");                /* Display local time */                error = _localtime32_s(&newtime, (__time32_t*) &pAdapter->LeaseObtained);                if (error)                    printf("Invalid Argument to _localtime32_s\n");                else {                    // Convert to an ASCII representation                     error = asctime_s(buffer, 32, &newtime);                    if (error)                        printf("Invalid Argument to asctime_s\n");                    else                        /* asctime_s returns the string terminated by \n\0 */                        printf("%s", buffer);                }                printf("\t  Lease Expires:  ");                error = _localtime32_s(&newtime, (__time32_t*) &pAdapter->LeaseExpires);                if (error)                    printf("Invalid Argument to _localtime32_s\n");                else {                    // Convert to an ASCII representation                     error = asctime_s(buffer, 32, &newtime);                    if (error)                        printf("Invalid Argument to asctime_s\n");                    else                        /* asctime_s returns the string terminated by \n\0 */                        printf("%s", buffer);                }            } else                printf("\tDHCP Enabled: No\n");            if (pAdapter->HaveWins) {                printf("\tHave Wins: Yes\n");                printf("\t  Primary Wins Server:    %s\n",                       pAdapter->PrimaryWinsServer.IpAddress.String);                printf("\t  Secondary Wins Server:  %s\n",                       pAdapter->SecondaryWinsServer.IpAddress.String);            } else                printf("\tHave Wins: No\n");            pAdapter = pAdapter->Next;            printf("\n");        }    } else {        printf("GetAdaptersInfo failed with error: %d\n", dwRetVal);    }    if (pAdapterInfo)        FREE(pAdapterInfo);    return 0;}