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Code to iterate over descendants of a device

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This commit is contained in:
Kovid Goyal 2016-01-16 21:13:12 +05:30
parent f0d61aef70
commit 845b896803
1 changed files with 30 additions and 1 deletions
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31
src/calibre/devices/winusb.py
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@ -253,7 +253,7 @@ def bool_err_check(result, func, args):
def config_err_check(result, func, args):
if result != CR_CODES['CR_SUCCESS']:
raise WindowsError((result, 'The cfgmgr32 function failed with err: %s' % CR_CODE_NAMES.get(result, result)))
raise WindowsError(result, 'The cfgmgr32 function failed with err: %s' % CR_CODE_NAMES.get(result, result))
return args
GetLogicalDrives = cwrap('GetLogicalDrives', DWORD, errcheck=bool_err_check, lib=kernel32)
@ -275,9 +275,12 @@ SetupDiGetDeviceRegistryProperty = cwrap(
'SetupDiGetDeviceRegistryPropertyW', BOOL, HDEVINFO, PSP_DEVINFO_DATA, DWORD, POINTER(DWORD), POINTER(BYTE), DWORD, POINTER(DWORD))
CM_Get_Parent = cwrap('CM_Get_Parent', CONFIGRET, POINTER(DEVINST), DEVINST, ULONG, errcheck=config_err_check)
CM_Get_Child = cwrap('CM_Get_Child', CONFIGRET, POINTER(DEVINST), DEVINST, ULONG, errcheck=config_err_check)
CM_Get_Sibling = cwrap('CM_Get_Sibling', CONFIGRET, POINTER(DEVINST), DEVINST, ULONG, errcheck=config_err_check)
CM_Get_Device_ID_Size = cwrap('CM_Get_Device_ID_Size', CONFIGRET, POINTER(ULONG), DEVINST, ULONG)
CM_Get_Device_ID = cwrap('CM_Get_Device_IDW', CONFIGRET, DEVINST, LPWSTR, ULONG, ULONG)
CM_Request_Device_Eject = cwrap('CM_Request_Device_EjectW', CONFIGRET, DEVINST, c_void_p, LPWSTR, ULONG, ULONG, errcheck=config_err_check)
# }}}
# Utility functions {{{
@ -287,6 +290,32 @@ def get_device_set(guid=byref(GUID_DEVINTERFACE_VOLUME), enumerator=None, flags=
yield dev_list
SetupDiDestroyDeviceInfoList(dev_list)
def iterchildren(parent_devinst):
child = DEVINST(0)
NO_MORE = CR_CODES['CR_NO_SUCH_DEVINST']
try:
CM_Get_Child(byref(child), parent_devinst, 0)
except WindowsError as err:
if err.winerror == NO_MORE:
return
raise
yield child
while True:
try:
CM_Get_Sibling(byref(child), child, 0)
except WindowsError as err:
if err.winerror == NO_MORE:
break
raise
yield child
def iterdescendants(parent_devinst):
for child in iterchildren(parent_devinst):
yield child
for gc in iterdescendants(child):
yield gc
def get_all_removable_drives():
mask = GetLogicalDrives()
ans = {}