Fwd: HELP

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Hello,
I need to retrieve HDD's infos in lua, and store them in variables.
Does someone has an idea, especially the physical serial number, not the 
one after formatting ?
Thanks,
JM Venet
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today, after hard searching on the net, I found this :
For windows, the disk informations are retrieveable via the library kernell32.dll
with the function GetVolumeInformation
this function sends these datas (contained in a data structure:
 _In_opt_  LPCTSTR lpRootPathName,
 _Out_opt_ LPTSTR  lpVolumeNameBuffer,
 _In_      DWORD   nVolumeNameSize,
 _Out_opt_ LPDWORD lpVolumeSerialNumber,
 _Out_opt_ LPDWORD lpMaximumComponentLength,
 _Out_opt_ LPDWORD lpFileSystemFlags,
 _Out_opt_ LPTSTR  lpFileSystemNameBuffer,
 _In_      DWORD   nFileSystemNameSize
I coded with Wscite this :
local path = 'C:\\Windows\\System32\\kernell32.dll'
local func = package.loadlib(path, 'GetVolumeInformation')
a = {}
a[1] = func.lpRootPathName
a[2] = func.lpVolumeNameBuffer
a[3] = func.nVolumeNameSize
a[4] = func.lpVolumeSerialNumber
a[5] = func.lpMaximumComponentLength
a[6] = func.lpFileSystemFlags
a[7] = func.lpFileSystemNameBuffer
a[8] = func.nFileSystemNameSize
after process by F5,
I received the following messages
>lua -e "io.stdout:setvbuf 'no'" "test.lua" 
lua: test.lua:6: attempt to index local 'func' (a nil value)
stack traceback:
	test.lua:6: in main chunk
	[C]: ?
>Exit code: 1
If I put the lines from the statement a = {}, to the end in comments
the messages are : (func is nil)
lua -e "io.stdout:setvbuf 'no'" "test.lua" 
>Exit code: 0
is there someone who can give me a little help to retrieve the datas contained
in the stucture returned by the function GetVolumeInformation
thanks for help
JM Venet