Sebastian Friebe wrote: > I'm trying to get access to a USB mass storage device in order to send > low-level SCSI commands, like TEST_UNIT_READY and REQUEST_SENSE. > I'm looking for a pure Python solution using the deviceIOcontrol > function out of the win32file package. > > Does anyone has experience with it? > > I heared about libusb_win32 and pyUSB, but I couldn't figure out if > these are really required. I guess these packages are needed just in > case you want to do higher level operations in an application, right?
This can't be done as you have described it. The problem is that the SCSI-like command set is only used between the USB mass storage driver (usbstor.sys) and the USB host controller driver. Above usbstor.sys, the device looks like a standard mass storage device. There are no hooks in usbstor.sys to allow you to send commands like this, nor does usbstor.sys allow you to send USB packets directly. Neither libusb-win32 nor pyUSB will help, because there is already a driver handling the device. libusb installs its own generic driver, but it can't install a driver if another one has already claimed the device. Theoretically, you could write an INF file to force your device to be claimed by libusb's driver, and then use libusb commands to talk to the device. You would then be in COMPLETE control of the device. However, that also means it won't be recognized as a mass storage device. It will just be a generic USB device. It may be that the easiest course of action for you is to write a lower filter driver to sit between usbstor.sys and USBD, and have it expose a "control" device object. Such a thing CAN be opened and manipulated using the win32file APIs. Do you have any driver experience at your shop? -- Tim Roberts, [EMAIL PROTECTED] Providenza & Boekelheide, Inc. _______________________________________________ python-win32 mailing list python-win32@python.org http://mail.python.org/mailman/listinfo/python-win32
