Cutlery/calibre
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This commit is contained in:
Kovid Goyal 2016-01-18 08:22:46 +05:30
parent b8fe3e52c9
commit 083f493834
1 changed files with 14 additions and 7 deletions
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21
src/calibre/devices/winusb.py
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@ -354,6 +354,18 @@ def iterdescendants(parent_devinst):
for gc in iterdescendants(child):
yield gc
def iterancestors(devinst):
NO_MORE = CR_CODES['CR_NO_SUCH_DEVINST']
parent = DEVINST(devinst)
while True:
try:
CM_Get_Parent(byref(parent), parent, 0)
except WindowsError as err:
if err.winerror == NO_MORE:
break
raise
yield parent.value
def get_all_removable_drives(allow_fixed=False):
mask = GetLogicalDrives()
ans = {}
@ -486,14 +498,9 @@ def get_removable_drives(debug=False): # {{{
# Get the devpaths for all parents of this device. This is not
# actually necessary on Vista+, so we simply ignore any windows API
# failures.
parent = DEVINST(devinfo.DevInst)
while True:
for parent in iterancestors(devinfo.DevInst):
try:
CM_Get_Parent(byref(parent), parent, 0)
except WindowsError:
break
try:
devid, buf = get_device_id(parent.value, buf=buf)
devid, buf = get_device_id(parent, buf=buf)
except WindowsError:
break
candidates.append(devid)