VC++ 通过 GetAdaptersInfo 函数获取网卡适配器信息列表

快速获取系统当前网络设备列表的方法，相对WMI方法，该方法的效率极高，但是获取的信息质量不行，（比较少）但只是对于要做强大网络工具的人来说，如果日常开发，提供的信息是足够用了的。

            typedef enum{OperationalStatus_Unknown,OperationalStatus_Up,OperationalStatus_Down,} OperationalStatus;typedef struct{ppp::string                             Id;ppp::string                             Name;ppp::string                             Address;ppp::string                             Mask;ppp::string                             GatewayServer;ppp::string                             DhcpServer;ppp::string                             PrimaryWinsServer;ppp::string                             SecondaryWinsServer;ppp::string                             MacAddress;int                                     IfIndex;int                                     IfType; // MIB_IF_TYPEOperationalStatus                       Status;} AdapterInterface;

            bool GetAllAdapterInterfaces(std::vector<AdapterInterfacePtr>& interfaces) noexcept{ULONG structSize = sizeof(IP_ADAPTER_INFO);std::shared_ptr<IP_ADAPTER_INFO> pArray = std::shared_ptr<IP_ADAPTER_INFO>((IP_ADAPTER_INFO*)Malloc(structSize),[](IP_ADAPTER_INFO* p) noexcept{Mfree(p);});int err = GetAdaptersInfo(pArray.get(), &structSize);if (err == ERROR_BUFFER_OVERFLOW) // ERROR_BUFFER_OVERFLOW == 111{// Buffer was too small, reallocate the correct size for the buffer.pArray = std::shared_ptr<IP_ADAPTER_INFO>((IP_ADAPTER_INFO*)Malloc(structSize),[](IP_ADAPTER_INFO* p) noexcept{Mfree(p);});err = GetAdaptersInfo(pArray.get(), &structSize);} // ifstd::string any = "0.0.0.0";if (err == ERROR_SUCCESS){// Call SucceededIP_ADAPTER_INFO* pEntry = pArray.get();do{// Retrieve the adapter info from the memory addressIP_ADAPTER_INFO& entry = *pEntry;AdapterInterfacePtr interfacex = make_shared_object<AdapterInterface>();interfacex->Id = entry.AdapterName;interfacex->IfIndex = entry.Index;interfacex->Name = entry.Description;interfacex->Address = entry.IpAddressList.IpAddress.String;interfacex->Mask = entry.IpAddressList.IpMask.String;interfacex->GatewayServer = entry.GatewayList.IpAddress.String;interfacex->IfType = entry.Type;interfacex->Status = GetOperationalStatus(entry.Index);interfacex->MacAddress = BytesToMacAddress(entry.Address, (int)entry.AddressLength);interfaces.emplace_back(interfacex);if (entry.DhcpEnabled != 0){interfacex->DhcpServer = entry.DhcpServer.IpAddress.String;}if (entry.HaveWins){interfacex->PrimaryWinsServer = entry.PrimaryWinsServer.IpAddress.String;interfacex->SecondaryWinsServer = entry.SecondaryWinsServer.IpAddress.String;}if (interfacex->Address.empty()) interfacex->Address = any;if (interfacex->Mask.empty()) interfacex->Mask = any;if (interfacex->GatewayServer.empty()) interfacex->GatewayServer = any;if (interfacex->DhcpServer.empty()) interfacex->DhcpServer = any;if (interfacex->PrimaryWinsServer.empty()) interfacex->PrimaryWinsServer = any;if (interfacex->SecondaryWinsServer.empty()) interfacex->SecondaryWinsServer = any;// Get next adapter (if any)pEntry = entry.Next;} while (NULL != pEntry);}return err == ERROR_SUCCESS;}

            OperationalStatus GetOperationalStatus(int interface_index) noexcept{if (interface_index < 0){return OperationalStatus_Unknown;}MIB_IFROW m;m.dwIndex = interface_index;DWORD err = GetIfEntry(&m);if (err == ERROR_SUCCESS){if (m.dwOperStatus == IF_OPER_STATUS_OPERATIONAL){return OperationalStatus_Up;}return OperationalStatus_Down;}return OperationalStatus_Unknown;}

            std::string BytesToMacAddress(const void* data, int size) noexcept{if ((size < 1) || (NULL != data && size < 1)){data = NULL;size = 0;}// Set default MAC addressunsigned char default_byte_arr[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };int num_of_bytes_to_copy = (size <= 6) ? size : 6;memcpy(default_byte_arr, data, num_of_bytes_to_copy);char mac_str[18];sprintf(mac_str, "%02X:%02X:%02X:%02X:%02X:%02X",default_byte_arr[0], default_byte_arr[1], default_byte_arr[2],default_byte_arr[3], default_byte_arr[4], default_byte_arr[5]);return mac_str;}std::shared_ptr<MIB_IFTABLE> GetIfTable() noexcept{DWORD dwSize = 0;if (::GetIfTable(NULL, &dwSize, FALSE) != ERROR_INSUFFICIENT_BUFFER){return NULL;}std::shared_ptr<MIB_IFTABLE> pIfTable = std::shared_ptr<MIB_IFTABLE>((MIB_IFTABLE*)Malloc(dwSize),[](MIB_IFTABLE* p) noexcept{Mfree(p);});if (pIfTable == NULL){return NULL;}if (::GetIfTable(pIfTable.get(), &dwSize, FALSE) != NO_ERROR){return NULL;}return pIfTable;}std::shared_ptr<MIB_IFROW> GetIfEntry(int interface_index) noexcept{if (interface_index < 0){return NULL;}std::shared_ptr<MIB_IFROW> pIfRow = std::shared_ptr<MIB_IFROW>((MIB_IFROW*)Malloc(sizeof(MIB_IFROW)),[](MIB_IFROW* p) noexcept{Mfree(p);});if (NULL == pIfRow){return NULL;}pIfRow->dwIndex = interface_index;if (::GetIfEntry(pIfRow.get()) != NO_ERROR){return NULL;}return pIfRow;}