Ethernet card's serial number. It's unique.

>Thanks Metin, it works good also to me. What is the meaning of this string? The serial disk or what else?
>Francesco
>
>
>
>>>>>>>Sometimes getdiskserial fails. It means that returns empty string. It depends on the user. But with the same user (poweruser), in different computer (in the same network) does the job. I can have the correct string, changing the user (as administrator works), but the poweruser has ( or so it seems) the complete control. I do not understand this behavior.
>>>>>>>Sombody can help me to solve this problem?
>>>>>>>Thnx in advance
>>>>>>
>>>>>>Don't use diskserial for copy protect. Use ethernet ID for that. That's a more reliable way.
>>>>>You mean the MAC address, I suppose.
>>>>>
>>>>>Peter
>>>>
>>>>Yes... Cetin said that "MAC address can be changed, too", but it's hard to do for an average user.
>>>
>>>I really don't know ethernet ID. Is it easy to use and where to search ?
>>
>>I can't remembered who gived me this function, it works good:
>>
>>

>>Local pGUID,rGUID
>>Declare integer CoCreateGuid in 'OLE32.dll' ;
>>  string @pguid
>>Declare integer StringFromGUID2 in 'OLE32.dll' ;
>>  string rguid, string @lpsz, integer cchMax
>>
>>pGUID=replicate(chr(0),16)
>>rGUID=replicate(chr(0),80)
>>
>>If "5." $ OS() && 2000/XP
>>  Declare integer UuidCreateSequential in 'RPCRT4.dll'  string @ Uuid
>>  lcMacAddress = iif( UuidCreateSequential(@pGUID) = 0 ;
>>    and StringFromGUID2(pGUID,@rGUID,40) # 0, ;
>>    substr(StrConv(left(rGUID,76),6),26,12), "" )
>>* VFP7
>>*  CLEAR DLLS 'UuidCreateSequential'
>>Else
>>  lcMacAddress = iif( CoCreateGuid(@pGUID) = 0 ;
>>    and StringFromGUID2(pGUID,@rGUID,40) # 0, ;
>>    substr(StrConv(left(rGUID,76),6),26,12), "" )
>>ENDIF
>>? lcMacAddress
>>*VFP7
>>*CLEAR DLLS 'WNetGetUser','GetComputerName','CoCreateGuid','StringFromGUID2'
>>
>>