Sebastian Friebe wrote:
> I saw an implementation in C++ using the winAPI DeviceIOControl()
> function to do low-level SCSI operations on a USB mass storage device.
> It is defined as follows:
>
> BOOL WINAPI DeviceIoControl(
> ...
> following settings have been applied:
> dwIoControlCode = IOCTL_SCSI_PASS_THROUGH_DIRECT
> lpInBuffer = lpOutBuffer = a structure containing several settings
> like PATH, TARGET, LUN IDs and CDB[]
> array and a buffer for input and output
> data
>
> So if your statement is right, this should even not work under C++,
> right? But it does.
>
OK, you talked me into it.
> Are there maybe some other stuff what makes it different?
> I really would like to understand that topic.
> Do you know some good references where I can find detailed information
> about USB handling under Windows environment?
>
> My first attempt to get it running under Python looks like this:
>
> IOCTL_SCSI_PASS_THROUGH_DIRECT = 0x4D014
>
That number is correct.
> disk_handle=win32file.CreateFile("\\\\.\\j:",
>
> win32con.GENERIC_READ|win32con.GENERIC_WRITE|win32con.GENERIC_EXECUTE,
> win32file.FILE_SHARE_READ
> |win32file.FILE_SHARE_WRITE,
> None,
> win32con.OPEN_EXISTING,
> 0,
> None);
>
GENERIC_EXECUTE should not be required, but if your C++ example had it,
you might as well keep it. Does the CreateFile succeed? You get a
reasonable handle? Note that on Vista you must be elevated to open a
volume directly.
> data = array.array("B", byte_list)
> string =
> win32file.DeviceIoControl(disk_handle,IOCTL_SCSI_PASS_THROUGH_DIRECT, data,
> 0, None)
>
> It seems that Windows excepted the control code, cause if I use a
> wrong one, I get an SYSTEM ERROR 50 - which is 'The request is not
> supported.'
>
That's fundamentally correct. How are you creating the
SCSI_PASS_THROUGH structure in "byte_list"? Are you sure it is 42
bytes? Are you setting all the fields correctly? How are you setting
the DataBuffer pointer? Have you set the Length field correctly?
I would have guessed it would be easier to use the struct module to
build the buffer, rather than array.
--
Tim Roberts, [EMAIL PROTECTED]
Providenza & Boekelheide, Inc.
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