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More debug prints

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This commit is contained in:
Kovid Goyal 2016-01-18 22:04:56 +05:30
parent 2eed1cf179
commit d1d0c606fa
1 changed files with 13 additions and 4 deletions
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17
src/calibre/devices/winusb.py
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@ -813,11 +813,15 @@ def get_usb_info(usbdev, debug=False): # {{{
try:
parent = next(iterancestors(usbdev.devinst))
except StopIteration:
if debug:
prints('Cannot get USB info as device has no parent (was probably disconnected)')
return ans
for devinfo, parent_path in DeviceSet(guid=GUID_DEVINTERFACE_USB_HUB).interfaces():
if devinfo.DevInst == parent:
break
else:
if debug:
prints('Cannot get USB info as parent of device is not a HUB')
return ans
for devlist, devinfo in DeviceSet(guid=GUID_DEVINTERFACE_USB_DEVICE).devices():
if devinfo.DevInst == usbdev.devinst:
@ -825,6 +829,10 @@ def get_usb_info(usbdev, debug=False): # {{{
break
else:
return ans
if not device_port:
if debug:
prints('Cannot get usb info as the SPDRP_ADDRESS property is not present int he registry (can happen with broken USB hub drivers)')
return ans
handle = CreateFile(parent_path, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, None, OPEN_EXISTING, 0, None)
try:
buf, dd = get_device_descriptor(handle, device_port)
@ -838,10 +846,11 @@ def get_usb_info(usbdev, debug=False): # {{{
buf, ans[name] = get_device_string(handle, device_port, index, buf=buf)
except WindowsError as err:
if debug:
if err.winerror == ERROR_GEN_FAILURE:
prints('Failed to read %s from device, try rebooting the device' % name)
else:
prints('Failed to read %s from device, with error: %s' % (name, as_unicode(err)))
# Note that I have observed that this fails
# randomly after some time of my Kindle being
# connected. Disconnecting and reconnecting causes
# it to start working again.
prints('Failed to read %s from device, with error: [%d] %s' % (name, err.winerror, as_unicode(err)))
finally:
CloseHandle(handle)
return ans