1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
|
#! python
#
# Enumerate serial ports on Windows including a human readable description
# and hardware information.
#
# (C) 2001-2015 Chris Liechti <cliechti@gmx.net>
#
# SPDX-License-Identifier: BSD-3-Clause
import re
import ctypes
from ctypes.wintypes import BOOL
from ctypes.wintypes import HWND
from ctypes.wintypes import DWORD
from ctypes.wintypes import WORD
from ctypes.wintypes import LONG
from ctypes.wintypes import ULONG
from ctypes.wintypes import LPCSTR
from ctypes.wintypes import HKEY
from ctypes.wintypes import BYTE
import serial
from serial.win32 import ULONG_PTR
def numsplit(text):
"""\
Convert string into a list of texts and numbers in order to support a
natural sorting.
"""
result = []
for group in re.split(r'(\d+)', text):
if group:
try:
group = int(group)
except ValueError:
pass
result.append(group)
return result
def ValidHandle(value, func, arguments):
if value == 0:
raise ctypes.WinError()
return value
NULL = 0
HDEVINFO = ctypes.c_void_p
PCTSTR = ctypes.c_char_p
PTSTR = ctypes.c_void_p
CHAR = ctypes.c_char
LPDWORD = PDWORD = ctypes.POINTER(DWORD)
#~ LPBYTE = PBYTE = ctypes.POINTER(BYTE)
LPBYTE = PBYTE = ctypes.c_void_p # XXX avoids error about types
ACCESS_MASK = DWORD
REGSAM = ACCESS_MASK
def byte_buffer(length):
"""Get a buffer for a string"""
return (BYTE*length)()
def string(buffer):
s = []
for c in buffer:
if c == 0:
break
s.append(chr(c & 0xff)) # "& 0xff": hack to convert signed to unsigned
return ''.join(s)
class GUID(ctypes.Structure):
_fields_ = [
('Data1', DWORD),
('Data2', WORD),
('Data3', WORD),
('Data4', BYTE*8),
]
def __str__(self):
return "{%08x-%04x-%04x-%s-%s}" % (
self.Data1,
self.Data2,
self.Data3,
''.join(["%02x" % d for d in self.Data4[:2]]),
''.join(["%02x" % d for d in self.Data4[2:]]),
)
class SP_DEVINFO_DATA(ctypes.Structure):
_fields_ = [
('cbSize', DWORD),
('ClassGuid', GUID),
('DevInst', DWORD),
('Reserved', ULONG_PTR),
]
def __str__(self):
return "ClassGuid:%s DevInst:%s" % (self.ClassGuid, self.DevInst)
PSP_DEVINFO_DATA = ctypes.POINTER(SP_DEVINFO_DATA)
PSP_DEVICE_INTERFACE_DETAIL_DATA = ctypes.c_void_p
setupapi = ctypes.windll.LoadLibrary("setupapi")
SetupDiDestroyDeviceInfoList = setupapi.SetupDiDestroyDeviceInfoList
SetupDiDestroyDeviceInfoList.argtypes = [HDEVINFO]
SetupDiDestroyDeviceInfoList.restype = BOOL
SetupDiClassGuidsFromName = setupapi.SetupDiClassGuidsFromNameA
SetupDiClassGuidsFromName.argtypes = [PCTSTR, ctypes.POINTER(GUID), DWORD, PDWORD]
SetupDiClassGuidsFromName.restype = BOOL
SetupDiEnumDeviceInfo = setupapi.SetupDiEnumDeviceInfo
SetupDiEnumDeviceInfo.argtypes = [HDEVINFO, DWORD, PSP_DEVINFO_DATA]
SetupDiEnumDeviceInfo.restype = BOOL
SetupDiGetClassDevs = setupapi.SetupDiGetClassDevsA
SetupDiGetClassDevs.argtypes = [ctypes.POINTER(GUID), PCTSTR, HWND, DWORD]
SetupDiGetClassDevs.restype = HDEVINFO
SetupDiGetClassDevs.errcheck = ValidHandle
SetupDiGetDeviceRegistryProperty = setupapi.SetupDiGetDeviceRegistryPropertyA
SetupDiGetDeviceRegistryProperty.argtypes = [HDEVINFO, PSP_DEVINFO_DATA, DWORD, PDWORD, PBYTE, DWORD, PDWORD]
SetupDiGetDeviceRegistryProperty.restype = BOOL
SetupDiGetDeviceInstanceId = setupapi.SetupDiGetDeviceInstanceIdA
SetupDiGetDeviceInstanceId.argtypes = [HDEVINFO, PSP_DEVINFO_DATA, PTSTR, DWORD, PDWORD]
SetupDiGetDeviceInstanceId.restype = BOOL
SetupDiOpenDevRegKey = setupapi.SetupDiOpenDevRegKey
SetupDiOpenDevRegKey.argtypes = [HDEVINFO, PSP_DEVINFO_DATA, DWORD, DWORD, DWORD, REGSAM]
SetupDiOpenDevRegKey.restype = HKEY
advapi32 = ctypes.windll.LoadLibrary("Advapi32")
RegCloseKey = advapi32.RegCloseKey
RegCloseKey.argtypes = [HKEY]
RegCloseKey.restype = LONG
RegQueryValueEx = advapi32.RegQueryValueExA
RegQueryValueEx.argtypes = [HKEY, LPCSTR, LPDWORD, LPDWORD, LPBYTE, LPDWORD]
RegQueryValueEx.restype = LONG
DIGCF_PRESENT = 2
DIGCF_DEVICEINTERFACE = 16
INVALID_HANDLE_VALUE = 0
ERROR_INSUFFICIENT_BUFFER = 122
SPDRP_HARDWAREID = 1
SPDRP_FRIENDLYNAME = 12
DICS_FLAG_GLOBAL = 1
DIREG_DEV = 0x00000001
KEY_READ = 0x20019
# workaround for compatibility between Python 2.x and 3.x
Ports = serial.to_bytes([80, 111, 114, 116, 115]) # "Ports"
PortName = serial.to_bytes([80, 111, 114, 116, 78, 97, 109, 101]) # "PortName"
class WinInfo(object):
"""Wrapper for device info"""
def __init__(self, dev):
self.dev = dev
self.description = None
self.hwid = None
self.vid = None
self.pid = None
self.serial = None
def describe(self):
"""Get a human readable string"""
return self.description if self.description is not None else 'n/a'
def hwinfo(self):
"""Get a hardware description string"""
if self.vid is not None:
return 'USB VID:PID={}:{}{}'.format(
self.vid,
self.pid,
' SER={}'.format(self.serial) if self.serial is not None else '',
)
else:
return self.hwid
def __eq__(self, other):
return self.dev == other.dev
def __lt__(self, other):
return numsplit(self.dev) < numsplit(other.dev)
def __getitem__(self, index):
"""Item access: backwards compatible -> (port, desc, hwid)"""
if index == 0:
return self.dev
elif index == 1:
return self.describe()
elif index == 2:
return self.hwinfo()
else:
raise IndexError('{} > 2'.format(index))
def comports():
GUIDs = (GUID*8)() # so far only seen one used, so hope 8 are enough...
guids_size = DWORD()
if not SetupDiClassGuidsFromName(
Ports,
GUIDs,
ctypes.sizeof(GUIDs),
ctypes.byref(guids_size)):
raise ctypes.WinError()
# repeat for all possible GUIDs
for index in range(guids_size.value):
g_hdi = SetupDiGetClassDevs(
ctypes.byref(GUIDs[index]),
None,
NULL,
DIGCF_PRESENT) # was DIGCF_PRESENT|DIGCF_DEVICEINTERFACE which misses CDC ports
devinfo = SP_DEVINFO_DATA()
devinfo.cbSize = ctypes.sizeof(devinfo)
index = 0
while SetupDiEnumDeviceInfo(g_hdi, index, ctypes.byref(devinfo)):
index += 1
# get the real com port name
hkey = SetupDiOpenDevRegKey(
g_hdi,
ctypes.byref(devinfo),
DICS_FLAG_GLOBAL,
0,
DIREG_DEV, # DIREG_DRV for SW info
KEY_READ)
port_name_buffer = byte_buffer(250)
port_name_length = ULONG(ctypes.sizeof(port_name_buffer))
RegQueryValueEx(
hkey,
PortName,
None,
None,
ctypes.byref(port_name_buffer),
ctypes.byref(port_name_length))
RegCloseKey(hkey)
# unfortunately does this method also include parallel ports.
# we could check for names starting with COM or just exclude LPT
# and hope that other "unknown" names are serial ports...
if string(port_name_buffer).startswith('LPT'):
continue
# hardware ID
szHardwareID = byte_buffer(250)
# try to get ID that includes serial number
if not SetupDiGetDeviceInstanceId(
g_hdi,
ctypes.byref(devinfo),
ctypes.byref(szHardwareID),
ctypes.sizeof(szHardwareID) - 1,
None):
# fall back to more generic hardware ID if that would fail
if not SetupDiGetDeviceRegistryProperty(
g_hdi,
ctypes.byref(devinfo),
SPDRP_HARDWAREID,
None,
ctypes.byref(szHardwareID),
ctypes.sizeof(szHardwareID) - 1,
None):
# Ignore ERROR_INSUFFICIENT_BUFFER
if ctypes.GetLastError() != ERROR_INSUFFICIENT_BUFFER:
raise ctypes.WinError()
# stringify
szHardwareID_str = string(szHardwareID)
info = WinInfo(string(port_name_buffer))
info.hwid = szHardwareID_str
# in case of USB, make a more readable string, similar to that form
# that we also generate on other platforms
if szHardwareID_str.startswith('USB'):
m = re.search(r'VID_([0-9a-f]{4})&PID_([0-9a-f]{4})(\\(\w+))?', szHardwareID_str, re.I)
if m:
info.vid = m.group(1)
info.pid = m.group(2)
if m.group(4):
info.serial = m.group(4)
# friendly name
szFriendlyName = byte_buffer(250)
if SetupDiGetDeviceRegistryProperty(
g_hdi,
ctypes.byref(devinfo),
SPDRP_FRIENDLYNAME,
#~ SPDRP_DEVICEDESC,
None,
ctypes.byref(szFriendlyName),
ctypes.sizeof(szFriendlyName) - 1,
None):
info.description = string(szFriendlyName)
#~ else:
# Ignore ERROR_INSUFFICIENT_BUFFER
#~ if ctypes.GetLastError() != ERROR_INSUFFICIENT_BUFFER:
#~ raise IOError("failed to get details for %s (%s)" % (devinfo, szHardwareID.value))
# ignore errors and still include the port in the list, friendly name will be same as port name
yield info
SetupDiDestroyDeviceInfoList(g_hdi)
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# test
if __name__ == '__main__':
for port, desc, hwid in sorted(comports()):
print("%s: %s [%s]" % (port, desc, hwid))
|