2010/9/11 Xiaofan Chen <xiaof...@gmail.com>
> On Sat, Sep 11, 2010 at 9:04 AM, Gao Hong <joy.highl...@gmail.com> wrote:
> > I see not,at the beginning I didn't install any driver for my usb
> > device,just level it as windows installed.
> > However how did the pyusb/libusb-windows backend find it and get the
> > device/interface descriptor for it with out winusb? the device is an mass
> > storage device.
>
> The libusb-1.0 Windows backend uses Setupapi for those kind of
> things. No WinUSB is needed to get the descriptors. However, once
> you want to do real operation, then you have to use the WinUSB driver.
>
> Actually I do not need the real read/write such operation,I just wanna
device/interface/string descriptor.
However PyUSB hasn't realized the get_string_descriptor yet,so I have to use
this code:
def getStringDescriptor(device, index):
"""
"""
#device.set_configuration()
response = device.ctrl_transfer(usb.util.ENDPOINT_IN,
usb.legacy.REQ_GET_DESCRIPTOR,
(usb.util.DESC_TYPE_STRING << 8) |
index,
0, # language id
255) # length
# TODO: Refer to 'libusb_get_string_descriptor_ascii' for error handling
return response[2:].tostring().decode('utf-16')
The result is that....I need to install libusb-win32/WinUSB driver...I
really really don't want to...
> Currently the libusb-win32 seems to be an better choice with filter-driver
> > if it works...
>
> If it is for your development use, the filter driver is okay. We still
> do not recommend to deploy filter driver to end users as potential
> problems can still occur, including BSODs in some circumstances.
>
>
> --
> Xiaofan
>
>
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