C++でMACアドレスを取得する

#include <iphlpapi.h>
#pragma comment(lib, "iphlpapi.lib")

BOOL GetMacAddressTest()
{
    PIP_ADAPTER_ADDRESSES pAddresses;
    PIP_ADAPTER_ADDRESSES pCurrent;
    ULONG                 ret;
    ULONG                 size;
    CString               mac;

    
    //必要なバッファサイズを取得
    ret = ::GetAdaptersAddresses(AF_UNSPEC, 0, NULL, NULL, &size);
    if (ERROR_BUFFER_OVERFLOW != ret) return FALSE;

    //必要なバッファを確保
    pAddresses = (PIP_ADAPTER_ADDRESSES)malloc(size);
    if (NULL == pAddresses) return FALSE;

    //ネットワークインターフェース情報を取得
    ret = ::GetAdaptersAddresses(AF_UNSPEC, 0, NULL, pAddresses, &size);
    if (ERROR_SUCCESS != ret) {
        free(pAddresses);
        return FALSE;
    }
    pCurrent = pAddresses;
    while (NULL != pCurrent) {
        //ネットワーク接続の状態を確認
        if (IfOperStatusUp == pCurrent->OperStatus) {
            //ネットワーク接続の種類を確認
            if (IF_TYPE_SOFTWARE_LOOPBACK != pCurrent->IfType) {
                //MACアドレスを取得
                if (0 < pCurrent->PhysicalAddressLength) {
                    mac.Empty();
                    for (ULONG i = 0; i < pCurrent->PhysicalAddressLength; ++ i) {
                        mac.AppendFormat(L"%02X", pCurrent->PhysicalAddress[i]);
                    }
                    TRACE(L"Physical address: %s\n", (LPCTSTR)mac);
                }
            }
        }
        pCurrent = pCurrent->Next;
    }
    free(pAddresses);
    return TRUE;
}