On 2017-11-07 08:58, Durumdara wrote:
> Hi!
>
> Windows 10, Python 3.6.
>
> I want to get the serial number of the drives (without external modules
> like Win32 or WMI).
> It is needed for identification of removable devices (like USB external
> drives).
>
> Somewhere I saw this code:
>
> def GetVolumeID(Drive):
> import ctypes
> kernel32 = ctypes.windll.kernel32
> volumeNameBuffer = ctypes.create_unicode_buffer(1024)
> fileSystemNameBuffer = ctypes.create_unicode_buffer(1024)
> serial_number = None
> max_component_length = None
> file_system_flags = None
>
> rc = kernel32.GetVolumeInformationW(
> ctypes.c_wchar_p(Drive),
> volumeNameBuffer,
> ctypes.sizeof(volumeNameBuffer),
> serial_number,
> max_component_length,
> file_system_flags,
> fileSystemNameBuffer,
> ctypes.sizeof(fileSystemNameBuffer)
> )
> return serial_number;
>
> print(GetVolumeID('c:\\'))
>
>
> This function is working with other values (volumeNameBuffer), but for
> serial it returns None.
> The serial number is empty.
> How to I pass this parameter to I get the value?
Do you get a value for max_component_length? (I wouldn't expect so, but
that is what you imply).
Anyway, the ctypes docs are pretty clear:
https://docs.python.org/3/library/ctypes.html#passing-pointers-or-passing-parameters-by-reference
>
> The doc said it's LPDWORD (pointer to DWORD):
>
> https://msdn.microsoft.com/en-us/library/windows/desktop/aa364993(v=vs.85).aspx
>
> _Out_opt_ LPDWORD lpVolumeSerialNumber,
>
>
> Thank you for any advance in this theme!
>
> Best wishes
> dd
>
--
Thomas Jollans
--
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