How to get MAC address in windows7? [duplicate] - windows

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Closed 12 years ago.
Possible Duplicates:
Getting Machine’s MAC Address — Good Solution?
How do I get the MAC address of a network card using Delphi?
I am using MAC address as hardware id for protection(ofcourse I have encrypted this data)
I am using below code to get MAC address on user computer
function MacAddress: string;
var
Lib: Cardinal;
Func: function(GUID: PGUID): Longint; stdcall;
GUID1, GUID2: TGUID;
begin
Result := '';
Lib := LoadLibrary('rpcrt4.dll');
if Lib <> 0 then
begin
#Func := GetProcAddress(Lib, 'UuidCreateSequential');
if Assigned(Func) then
begin
if (Func(#GUID1) = 0) and
(Func(#GUID2) = 0) and
(GUID1.D4[2] = GUID2.D4[2]) and
(GUID1.D4[3] = GUID2.D4[3]) and
(GUID1.D4[4] = GUID2.D4[4]) and
(GUID1.D4[5] = GUID2.D4[5]) and
(GUID1.D4[6] = GUID2.D4[6]) and
(GUID1.D4[7] = GUID2.D4[7]) then
begin
Result :=
IntToHex(GUID1.D4[2], 2) + '-' +
IntToHex(GUID1.D4[3], 2) + '-' +
IntToHex(GUID1.D4[4], 2) + '-' +
IntToHex(GUID1.D4[5], 2) + '-' +
IntToHex(GUID1.D4[6], 2) + '-' +
IntToHex(GUID1.D4[7], 2);
end;
end;
end;
end;
above code works perfectly on windows XP
but its giving different values in windows7 ,the value changing every time after computer resratred :(
is there any chance of getting MAC address thats constant (unless user changed his MAC address)
or is there any good code which retrvies constant data on all OS ?
thanks in advance

Answer 1

#steve0, to retrieve the mac address of an Network Adapter you can use the WMI and the Win32_NetworkAdapterConfiguration Class and check the MACAddress property.
Check this code:
program WMI_MAC;
{$APPTYPE CONSOLE}
uses
SysUtils
,ActiveX
,ComObj
,Variants;
function VarToStrNil(Value:Variant):string; //Dummy function to onvert an variant value to string
begin
if VarIsNull(Value) then
Result:=''
else
Result:=VarToStr(Value);
end;
Procedure GetMacAddress;
var
objWMIService : OLEVariant;
colItems : OLEVariant;
colItem : OLEVariant;
oEnum : IEnumvariant;
iValue : LongWord;
wmiHost, root, wmiClass: string;
function GetWMIObject(const objectName: String): IDispatch;
var
chEaten: Integer;
BindCtx: IBindCtx;//for access to a bind context
Moniker: IMoniker;//Enables you to use a moniker object
begin
OleCheck(CreateBindCtx(0, bindCtx));
OleCheck(MkParseDisplayName(BindCtx, StringToOleStr(objectName), chEaten, Moniker));//Converts a string into a moniker that identifies the object named by the string
OleCheck(Moniker.BindToObject(BindCtx, nil, IDispatch, Result));//Binds to the specified object
end;
begin
wmiHost := '.';
root := 'root\CIMV2';
wmiClass := 'Win32_NetworkAdapterConfiguration';
objWMIService := GetWMIObject(Format('winmgmts:\\%s\%s',[wmiHost,root]));
colItems := objWMIService.ExecQuery(Format('SELECT * FROM %s',[wmiClass]),'WQL',0);
oEnum := IUnknown(colItems._NewEnum) as IEnumVariant;
while oEnum.Next(1, colItem, iValue) = 0 do
//if VarToStrNil(colItem.MACAddress)<>'' then //uncomment if you only want list the interfaces with mac adress
//if colItem.IPEnabled then // uncomment if you only want list the active interfaces
begin
WriteLn('Card Description '+VarToStrNil(colItem.Caption));
WriteLn('MACAddress '+VarToStrNil(colItem.MACAddress));
end;
end;
begin
try
CoInitialize(nil);
try
GetMacAddress;
Readln;
finally
CoUninitialize;
end;
except
on E:Exception do
Begin
Writeln(E.Classname, ': ', E.Message);
Readln;
End;
end;
end.

Answer 2

Here is some code working well for any computer on your network - may try it to get your own, using '127.0.0.1' as IP:
function GetRemoteMacAddress(const IP: AnsiString): TSockData;
// implements http://msdn.microsoft.com/en-us/library/aa366358(VS.85).aspx
type
TSendARP = function(DestIp: DWORD; srcIP: DWORD; pMacAddr: pointer; PhyAddrLen: Pointer): DWORD; stdcall;
const
HexChars: array[0..15] of AnsiChar = '0123456789ABCDEF';
var dwRemoteIP: DWORD;
PhyAddrLen: Longword;
pMacAddr : array [0..7] of byte;
I: integer;
P: PAnsiChar;
SendARPLibHandle: THandle;
SendARP: TSendARP;
begin
result := '';
SendARPLibHandle := LoadLibrary('iphlpapi.dll');
if SendARPLibHandle<>0 then
try
SendARP := GetProcAddress(SendARPLibHandle,'SendARP');
if #SendARP=nil then
exit; // we are not under 2K or later
dwremoteIP := inet_addr(pointer(IP));
if dwremoteIP<>0 then begin
PhyAddrLen := 8;
if SendARP(dwremoteIP, 0, #pMacAddr, #PhyAddrLen)=NO_ERROR then begin
if PhyAddrLen=6 then begin
SetLength(result,12);
P := pointer(result);
for i := 0 to 5 do begin
P[0] := HexChars[pMacAddr[i] shr 4];
P[1] := HexChars[pMacAddr[i] and $F];
inc(P,2);
end;
end;
end;
end;
finally
FreeLibrary(SendARPLibHandle);
end;
end;
This code is extracted from our freeware and open source framework, unit SynCrtSock.pas. See http://synopse.info/fossil