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list_ports_windows.py
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#! python # # Enumerate serial ports on Windows including a human readable description # and hardware information. # # This file is part of pySerial. https://github.com/pyserial/pyserial # (C) 2001-2016 Chris Liechti <cliechti@gmx.net> # # SPDX-License-Identifier: BSD-3-Clause # pylint: disable=invalid-name,too-few-public-methods 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 HKEY from ctypes.wintypes import BYTE import serial from serial.win32 import ULONG_PTR from serial.tools import list_ports_common def ValidHandle(value, func, arguments): if value == 0: raise ctypes.WinError() return value NULL = 0 HDEVINFO = ctypes.c_void_p LPCTSTR = ctypes.c_wchar_p PCTSTR = ctypes.c_wchar_p PTSTR = ctypes.c_wchar_p 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 class GUID(ctypes.Structure): _fields_ = [ ('Data1', DWORD), ('Data2', WORD), ('Data3', WORD), ('Data4', BYTE * 8), ] def __str__(self): return "{{{:08x}-{:04x}-{:04x}-{}-{}}}".format( self.Data1, self.Data2, self.Data3, ''.join(["{:02x}".format(d) for d in self.Data4[:2]]), ''.join(["{:02x}".format(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:{} DevInst:{}".format(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.SetupDiClassGuidsFromNameW 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.SetupDiGetClassDevsW SetupDiGetClassDevs.argtypes = [ctypes.POINTER(GUID), PCTSTR, HWND, DWORD] SetupDiGetClassDevs.restype = HDEVINFO SetupDiGetClassDevs.errcheck = ValidHandle SetupDiGetDeviceRegistryProperty = setupapi.SetupDiGetDeviceRegistryPropertyW SetupDiGetDeviceRegistryProperty.argtypes = [HDEVINFO, PSP_DEVINFO_DATA, DWORD, PDWORD, PBYTE, DWORD, PDWORD] SetupDiGetDeviceRegistryProperty.restype = BOOL SetupDiGetDeviceInstanceId = setupapi.SetupDiGetDeviceInstanceIdW 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.RegQueryValueExW RegQueryValueEx.argtypes = [HKEY, LPCTSTR , 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 SPDRP_LOCATION_PATHS = 35 SPDRP_MFG = 11 DICS_FLAG_GLOBAL = 1 DIREG_DEV = 0x00000001 KEY_READ = 0x20019 def iterate_comports(): """Return a generator that yields descriptions for serial ports""" 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): bInterfaceNumber = None 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 = ctypes.create_unicode_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 port_name_buffer.value.startswith('LPT'): continue # hardware ID szHardwareID = ctypes.create_unicode_buffer(250) # try to get ID that includes serial number if not SetupDiGetDeviceInstanceId( g_hdi, ctypes.byref(devinfo), #~ ctypes.byref(szHardwareID), 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 = szHardwareID.value info = list_ports_common.ListPortInfo(port_name_buffer.value) # 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}))?(&MI_(\d{2}))?(\\(\w+))?', szHardwareID_str, re.I) if m: info.vid = int(m.group(1), 16) if m.group(3): info.pid = int(m.group(3), 16) if m.group(5): bInterfaceNumber = int(m.group(5)) if m.group(7): info.serial_number = m.group(7) # calculate a location string loc_path_str = ctypes.create_unicode_buffer(250) if SetupDiGetDeviceRegistryProperty( g_hdi, ctypes.byref(devinfo), SPDRP_LOCATION_PATHS, None, ctypes.byref(loc_path_str), ctypes.sizeof(loc_path_str) - 1, None): m = re.finditer(r'USBROOT\((\w+)\)|#USB\((\w+)\)', loc_path_str.value) location = [] for g in m: if g.group(1): location.append('{:d}'.format(int(g.group(1)) + 1)) else: if len(location) > 1: location.append('.') else: location.append('-') location.append(g.group(2)) if bInterfaceNumber is not None: location.append(':{}.{}'.format( 'x', # XXX how to determine correct bConfigurationValue? bInterfaceNumber)) if location: info.location = ''.join(location) info.hwid = info.usb_info() elif szHardwareID_str.startswith('FTDIBUS'): m = re.search(r'VID_([0-9a-f]{4})\+PID_([0-9a-f]{4})(\+(\w+))?', szHardwareID_str, re.I) if m: info.vid = int(m.group(1), 16) info.pid = int(m.group(2), 16) if m.group(4): info.serial_number = m.group(4) # USB location is hidden by FDTI driver :( info.hwid = info.usb_info() else: info.hwid = szHardwareID_str # friendly name szFriendlyName = ctypes.create_unicode_buffer(250) if SetupDiGetDeviceRegistryProperty( g_hdi, ctypes.byref(devinfo), SPDRP_FRIENDLYNAME, #~ SPDRP_DEVICEDESC, None, ctypes.byref(szFriendlyName), ctypes.sizeof(szFriendlyName) - 1, None): info.description = szFriendlyName.value #~ 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 # manufacturer szManufacturer = ctypes.create_unicode_buffer(250) if SetupDiGetDeviceRegistryProperty( g_hdi, ctypes.byref(devinfo), SPDRP_MFG, #~ SPDRP_DEVICEDESC, None, ctypes.byref(szManufacturer), ctypes.sizeof(szManufacturer) - 1, None): info.manufacturer = szManufacturer.value yield info SetupDiDestroyDeviceInfoList(g_hdi) def comports(include_links=False): """Return a list of info objects about serial ports""" return list(iterate_comports()) # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - # test if __name__ == '__main__': for port, desc, hwid in sorted(comports()): print("{}: {} [{}]".format(port, desc, hwid))