Obtain the MAC address from an IP address

Uses
Winsock;

Function sendarp (ipaddr: ulong;
Temp: DWORD;
Ulmacaddr: pointer;
Ulmacaddrleng: pointer): DWORD; stdcall; External 'lplpapi. dll 'name 'sendarp ';

Procedure tform1.button1click (Sender: tobject );
VaR
Myip: ulong;
Mymac: array [0 .. 5] of byte;
Mymaclength: ulong;
R: integer;
Begin
Myip: = inet_addr (pchar ('192. 168.6.180 '));
Mymaclength: = length (mymac );
R: = sendarp (myip, 0, @ mymac, @ mymaclength );
Label1.caption: = 'errorcode: '+ inttostr (R );
Label2.caption: = format ('% 2.2x: % 2.2x: % 2.2x: % 2.2x: % 2.2x: % 2.2x', [mymac [0], mymac [1], mymac [2], mymac [3], mymac [4], mymac [5]);
End;

19:53:30 2. Obtain the MAC address (including multiple NICS) unit unit1;

Interface

Uses
Windows, messages, sysutils, variants, classes, graphics, controls, forms,
WinSock, stdctrls;

Const
Max_hostname_len = 128; {from iptypes. h}
Max_domain_name_len= 128;
Max_scope_id_len= 256;
Max_adapter_name_length = 256;
Max_adapter_description_length = 128;
Max_adapter_address_length = 8;

Type
Tipaddressstring = array [0 .. 4*4-1] of char;

Pipaddrstring = ^ tipaddrstring;
Tipaddrstring = record
Next: pipaddrstring;
IPaddress: tipaddressstring;
Ipmask: tipaddressstring;
Context: integer;
End;

Pfixedinfo = ^ tfixedinfo;
Tfixedinfo = record {fixed_info}
Hostname: array [0 .. max_hostname_len + 3] of char;
Domainname: array [0 .. max_domain_name_len + 3] of char;
Currentdnsserver: pipaddrstring;
Dnsserverlist: tipaddrstring;
Nodetype: integer;
Scopeid: array [0 .. max_scope_id_len + 3] of char;
Enablerouting: integer;
Enableproxy: integer;
Enabledns: integer;
End;

Pipadapterinfo = ^ tipadapterinfo;
Tipadapterinfo = record {ip_adapter_info}
Next: pipadapterinfo;
Comboindex: integer;
Adaptername: array [0 .. max_adapter_name_length + 3] of char;
Description: array [0 .. max_adapter_description_length + 3] of char;
Addresslength: integer;
Address: array [1 .. max_adapter_address_length] of byte;
Index: integer;
_ Type: integer;
Dhcpenabled: integer;
Currentipaddress: pipaddrstring;
Ipaddresslist: tipaddrstring;
Gatewaylist: tipaddrstring;
Dhcpserver: tipaddrstring;
Havewins: bool;
Primarywinsserver: tipaddrstring;
Secondarywinsserver: tipaddrstring;
Leaseobtained: integer;
Leaseexpires: integer;
End;

Type
Tform1 = Class (tform)
Button1: tbutton;
Memo1: tmemo;
Procedure button1click (Sender: tobject );
Private
{Private Declarations}
Procedure getadapterinformation;
Public
{Public declarations}
End;

VaR
Form1: tform1;

Function sendarp (ipaddr: ulong;
Temp: DWORD;
Ulmacaddr: pointer;
Ulmacaddrleng: pointer): DWORD; stdcall;

Implementation

{$ R *. DFM}

Function sendarp; External 'lplpapi. dll 'name' sendarp ';
Function getadaptersinfo (AI: pipadapterinfo; var buflen: integer): integer;
Stdcall; External 'lplpapi. dll 'name' getadaptersinfo ';

Procedure tform1.getadapterinformation;
VaR
AI, work: pipadapterinfo;
Size: integer;
Res: integer;
I: integer;

Function mactostr (bytearr: pbyte; Len: integer): string;
Begin
Result: = '';
While (LEN> 0) Do begin
Result: = Result + inttohex (bytearr ^, 2) + '-';
Bytearr: = pointer (INTEGER (bytearr) + sizeof (byte ));
Dec (LEN );
End;
Setlength (result, length (result)-1); {remove last dash}
End;

Function getaddrstring (ADDR: pipaddrstring): string;
Begin
Result: = '';
While (ADDR <> nil) Do begin
Result: = Result + 'a: '+ ADDR ^. IPaddress +'m:' + ADDR ^. ipmask + #13;
ADDR: = ADDR ^. Next;
End;
End;

Function timettodatetimestr (timet: integer): string;
Const unixdatedelta = 25569; {days between 12/31/1899 and 1/1/1970}
VaR
DT: tdatetime;
TZ: ttimezoneinformation;
Res: DWORD;

Begin
If (timet = 0) then result: =''
Else begin
{UNIX time_t is secs since 1/1/1970}
DT: = unixdatedelta + (timet/(24*60*60); {in UTC}
{Calculate bias}
Res: = gettimezoneinformation (Tz );
If (RES = time_zone_id_invalid) Then raiselastwin32error;
If (RES = time_zone_id_standard) then begin
DT: = DT-(tz. bias + tz. standardbias)/(24*60 ));
Result: = datetimetostr (DT) + ''+ widechartostring (tz. standardname );
End
Else begin {Daylight Saving Time}
DT: = DT-(tz. bias + tz. daylightbias)/(24*60 ));
Result: = datetimetostr (DT) + ''+ widechartostring (tz. daylightname );
End;
End;
End;

Begin
Memo1.lines. Clear;
Size: = 5120;
Getmem (AI, size );
Res: = getadaptersinfo (AI, size );
If (RES <> error_success) then begin
Setlasterror (RES );
Raiselastwin32error;
End;
With memo1, lines do begin
Work: = AI;
I: = 1;
Repeat
Add ('');
Add ('adapter '+ inttostr (I ));
Add ('comboindex: '+ inttostr (Work ^. comboindex ));
Add ('adapter name: '+ work ^. adaptername );
Add ('description: '+ work ^. Description );
Add ('adapter address: '+ mactostr (@ WORK ^. Address, work ^. addresslength ));
Add ('index: '+ inttostr (Work ^. Index ));
Add ('Type: '+ inttostr (Work ^. _ type ));
Add ('dhcp: '+ inttostr (Work ^. dhcpenabled ));
Add ('current IP: '+ getaddrstring (Work ^. currentipaddress ));
Add ('IP addresses: '+ getaddrstring (@ WORK ^. ipaddresslist ));
Add ('gateways: '+ getaddrstring (@ WORK ^. gatewaylist ));
Add ('dhcp servers: '+ getaddrstring (@ WORK ^. dhcpserver ));
Add ('has wins: '+ inttostr (INTEGER (Work ^. havewins )));
Add ('Primary wins: '+ getaddrstring (@ WORK ^. primarywinsserver ));
Add ('secondary wins: '+ getaddrstring (@ WORK ^. secondarywinsserver ));
Add ('lease obtained: '+ timettodatetimestr (Work ^. leaseobtained ));
Add ('lease expires: '+ timettodatetimestr (Work ^. leaseexpires ));
INC (I );
Work: = work ^. Next;
Until (Work = nil );
End;
Freemem (AI );
End;

Procedure tform1.button1click (Sender: tobject );
Begin
Getadapterinformation;
End;

End.