Three ways to get the MAC address of the NIC in the system

A good programmer is a person. See more think perhaps he mountain stone can attack jade, but never become the slave of code. Cker

Original: Borland

Translated by Cker

The first approach uses the Microsoft NetBIOS API. This is a set of commands that provide the underlying network support via Winsock. The biggest disadvantage of using NetBIOS is that you must have a NetBIOS service installed on your system (this is not a problem if you have file sharing enabled on the Windows network). Besides this, this method is quick and accurate.

The NetBIOS API includes only one function, called NetBIOS. This function uses the network control block (network) structure as a parameter, and this structure tells the function what to do. The structure is defined as follows:

typedef struct _NCB {
　　 UCHAR　ncb_command;
　　 UCHAR　ncb_retcode;
　　 UCHAR　ncb_lsn;
　　 UCHAR　ncb_num;
　　 PUCHAR ncb_buffer;
　　 WORD　 ncb_length;
　　 UCHAR　ncb_callname[NCBNAMSZ];
　　 UCHAR　ncb_name[NCBNAMSZ];
　　 UCHAR　ncb_rto;
　　 UCHAR　ncb_sto;
　　 void (CALLBACK *ncb_post) (struct _NCB *);
　　 UCHAR　ncb_lana_num;
　　 UCHAR　ncb_cmd_cplt;
#ifdef _WIN64
　　 UCHAR　ncb_reserve[18];
#else
　　 UCHAR　ncb_reserve[10];
#endif
　　 HANDLE ncb_event;
} NCB, *PNCB;

The focus is on Ncb_command members. The member told the NetBIOS what to do. We use three commands to detect the MAC address. Their definition of MSDN is as follows:

Command Description:

Ncbenum Windows nt/2000: Enumerates the number of network cards in the system. When this command is used, the Ncb_buffer member points to a buffer that is populated by the lana_enum structure.

Ncbenum is not a standard NetBIOS 3.0 command.

Ncbreset reset the network card. The NIC must be reset before accepting the new NCB command.

Ncbastat accept the status of the local or remote interface card. When this command is used, the Ncb_buffer member points to a buffer populated by the adapter_status structure followed by an array of name_buffer structures.

Here are the steps to get your system MAC address:

1 lists all the interface cards.

2 resets each card to obtain its correct information.

3 Query interface card, get MAC address and generate standard colon delimited format.