GetAdaptersInfo   得到网卡信息
MSDN上面这个函数有个实例。我朋友机器总是在下面那句出现异常
但是我公司机器和我的机器都不会出现问题。 不知道为什么？

if (GetAdaptersInfo( pAdapterInfo, &ulOutBufLen) == ERROR_BUFFER_OVERFLOW) {

MSDN 上面完整 例子 我也贴这里吧：

//-----------------------------------------------------------------------------

// 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, gateway,
// and secondary WINS server for each adapter.

PIP_ADAPTER_INFO pAdapterInfo;
PIP_ADAPTER_INFO pAdapter = NULL;
DWORD dwRetVal = 0;

/* variables used to print DHCP time info */
struct tm newtime;
char buffer[32];   
errno_t error;

pAdapterInfo = (IP_ADAPTER_INFO *) malloc( sizeof(IP_ADAPTER_INFO) );
ULONG ulOutBufLen = sizeof(IP_ADAPTER_INFO);

// 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("\tAdapter Name: \t%s\n", pAdapter->AdapterName);
    printf("\tAdapter Desc: \t%s\n", pAdapter->Description);
    printf("\tAdapter Addr: \t");
    for (UINT 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("\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\tDHCP Server: \t%s\n", pAdapter->DhcpServer.IpAddress.String);

      printf("\tLease Obtained: ");
      /* Display local time */
      error = _localtime32_s(&newtime, &pAdapter->LeaseObtained);
      if (error)
        printf("\tInvalid 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("\tLease Expires:  ");
      error = _localtime32_s(&newtime, &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\tPrimary Wins Server: \t%s\n", pAdapter->PrimaryWinsServer.IpAddress.String);
      printf("\t\tSecondary Wins Server: \t%s\n", pAdapter->SecondaryWinsServer.IpAddress.String);
    }
    else
      printf("\tHave Wins: No\n");
    pAdapter = pAdapter->Next;
  }
}
else {
  printf("GetAdaptersInfo failed with error: %d\n", dwRetVal);

if (pAdapterInfo)
  free(pAdapterInfo);
}

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