import ctypes
import re

def ValidHandle(value):
if value == 0:
raise ctypes.WinError()
return value

NULL = 0
HDEVINFO = ctypes.c_int
BOOL = ctypes.c_int
CHAR = ctypes.c_char
PCTSTR = ctypes.c_char_p
HWND = ctypes.c_uint
DWORD = ctypes.c_ulong
PDWORD = ctypes.POINTER(DWORD)
ULONG = ctypes.c_ulong
ULONG_PTR = ctypes.POINTER(ULONG)
#~ PBYTE = ctypes.c_char_p
PBYTE = ctypes.c_void_p

class GUID(ctypes.Structure):
_fields_ = [
('Data1', ctypes.c_ulong),
('Data2', ctypes.c_ushort),
('Data3', ctypes.c_ushort),
('Data4', ctypes.c_ubyte*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)

class SP_DEVICE_INTERFACE_DATA(ctypes.Structure):
_fields_ = [
('cbSize', DWORD),
('InterfaceClassGuid', GUID),
('Flags', DWORD),
('Reserved', ULONG_PTR),
]
def __str__(self):
return "InterfaceClassGuid:%s Flags:%s" % (self.InterfaceClassGuid, self.Flags)

PSP_DEVICE_INTERFACE_DATA = ctypes.POINTER(SP_DEVICE_INTERFACE_DATA)

PSP_DEVICE_INTERFACE_DETAIL_DATA = ctypes.c_void_p

class dummy(ctypes.Structure):
_fields_=[("d1", DWORD), ("d2", CHAR)]
_pack_ = 1
SIZEOF_SP_DEVICE_INTERFACE_DETAIL_DATA_A = ctypes.sizeof(dummy)

SetupDiDestroyDeviceInfoList = ctypes.windll.setupapi.SetupDiDestroyDeviceInfoList
SetupDiDestroyDeviceInfoList.argtypes = [HDEVINFO]
SetupDiDestroyDeviceInfoList.restype = BOOL

SetupDiGetClassDevs = ctypes.windll.setupapi.SetupDiGetClassDevsA
SetupDiGetClassDevs.argtypes = [ctypes.POINTER(GUID), PCTSTR, HWND, DWORD]
SetupDiGetClassDevs.restype = ValidHandle # HDEVINFO

SetupDiEnumDeviceInterfaces = ctypes.windll.setupapi.SetupDiEnumDeviceInterfaces
SetupDiEnumDeviceInterfaces.argtypes = [HDEVINFO, PSP_DEVINFO_DATA, ctypes.POINTER(GUID), DWORD, PSP_DEVICE_INTERFACE_DATA]
SetupDiEnumDeviceInterfaces.restype = BOOL

SetupDiGetDeviceInterfaceDetail = ctypes.windll.setupapi.SetupDiGetDeviceInterfaceDetailA
SetupDiGetDeviceInterfaceDetail.argtypes = [HDEVINFO, PSP_DEVICE_INTERFACE_DATA, PSP_DEVICE_INTERFACE_DETAIL_DATA, DWORD, PDWORD, PSP_DEVINFO_DATA]
SetupDiGetDeviceInterfaceDetail.restype = BOOL

SetupDiGetDeviceRegistryProperty = ctypes.windll.setupapi.SetupDiGetDeviceRegistryPropertyA
SetupDiGetDeviceRegistryProperty.argtypes = [HDEVINFO, PSP_DEVINFO_DATA, DWORD, PDWORD, PBYTE, DWORD, PDWORD]
SetupDiGetDeviceRegistryProperty.restype = BOOL


GUID_CLASS_COMPORT = GUID(0x86e0d1e0L, 0x8089, 0x11d0,
(ctypes.c_ubyte*8)(0x9c, 0xe4, 0x08, 0x00, 0x3e, 0x30, 0x1f, 0x73))

DIGCF_PRESENT = 2
DIGCF_DEVICEINTERFACE = 16
INVALID_HANDLE_VALUE = 0
ERROR_INSUFFICIENT_BUFFER = 122
SPDRP_HARDWAREID = 1
SPDRP_FRIENDLYNAME = 12
SPDRP_LOCATION_INFORMATION = 13
ERROR_NO_MORE_ITEMS = 259

def comports(available_only=True):
"""This generator scans the device registry for com ports and yields
(order, port, desc, hwid). If available_only is true only return currently
existing ports. Order is a helper to get sorted lists. it can be ignored
otherwise."""
flags = DIGCF_DEVICEINTERFACE
if available_only:
flags |= DIGCF_PRESENT
g_hdi = SetupDiGetClassDevs(ctypes.byref(GUID_CLASS_COMPORT), None, NULL, flags);
#~ for i in range(256):
for dwIndex in range(256):
did = SP_DEVICE_INTERFACE_DATA()
did.cbSize = ctypes.sizeof(did)

if not SetupDiEnumDeviceInterfaces(
g_hdi,
None,
ctypes.byref(GUID_CLASS_COMPORT),
dwIndex,
ctypes.byref(did)
):
if ctypes.GetLastError() != ERROR_NO_MORE_ITEMS:
raise ctypes.WinError()
break

dwNeeded = DWORD()
# get the size
if not SetupDiGetDeviceInterfaceDetail(
g_hdi,
ctypes.byref(did),
None, 0, ctypes.byref(dwNeeded),
None
):
# Ignore ERROR_INSUFFICIENT_BUFFER
if ctypes.GetLastError() != ERROR_INSUFFICIENT_BUFFER:
raise ctypes.WinError()
# allocate buffer
class SP_DEVICE_INTERFACE_DETAIL_DATA_A(ctypes.Structure):
_fields_ = [
('cbSize', DWORD),
('DevicePath', CHAR*(dwNeeded.value - ctypes.sizeof(DWORD))),
]
def __str__(self):
return "DevicePath:%s" % (self.DevicePath,)
idd = SP_DEVICE_INTERFACE_DETAIL_DATA_A()
idd.cbSize = SIZEOF_SP_DEVICE_INTERFACE_DETAIL_DATA_A
devinfo = SP_DEVINFO_DATA()
devinfo.cbSize = ctypes.sizeof(devinfo)
if not SetupDiGetDeviceInterfaceDetail(
g_hdi,
ctypes.byref(did),
ctypes.byref(idd), dwNeeded, None,
ctypes.byref(devinfo)
):
raise ctypes.WinError()

# hardware ID
szHardwareID = ctypes.create_string_buffer(250)
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()

# friendly name
szFriendlyName = ctypes.create_string_buffer(1024)
if not SetupDiGetDeviceRegistryProperty(
g_hdi,
ctypes.byref(devinfo),
SPDRP_FRIENDLYNAME,
None,
ctypes.byref(szFriendlyName), ctypes.sizeof(szFriendlyName) - 1,
None
):
# Ignore ERROR_INSUFFICIENT_BUFFER
if ctypes.GetLastError() != ERROR_INSUFFICIENT_BUFFER:
#~ raise ctypes.WinError()
# not getting friendly name for com0com devices, try something else
szFriendlyName = ctypes.create_string_buffer(1024)
if SetupDiGetDeviceRegistryProperty(
g_hdi,
ctypes.byref(devinfo),
SPDRP_LOCATION_INFORMATION,
None,
ctypes.byref(szFriendlyName), ctypes.sizeof(szFriendlyName) - 1,
None
):
port_name = "\\\\.\\" + szFriendlyName.value
order = None
else:
port_name = szFriendlyName.value
order = None
else:
try:
m = re.search(r"\((.*?(\d+))\)", szFriendlyName.value)
#~ print szFriendlyName.value, m.groups()
port_name = m.group(1)
order = int(m.group(2))
except AttributeError, msg:
port_name = szFriendlyName.value
order = None
yield order, port_name, szFriendlyName.value, szHardwareID.value

SetupDiDestroyDeviceInfoList(g_hdi)


if __name__ == '__main__':
import serial
print "-"*78
print "Serial ports"
print "-"*78
for order, port, desc, hwid in sorted(comports()):
print "%-10s: %s (%s) ->" % (port, desc, hwid),
try:
serial.Serial(port) # test open
except serial.serialutil.SerialException:
print "can't be openend"
else:
print "Ready"
print
# list of all ports the system knows
print "-"*78
print "All serial ports (registry)"
print "-"*78
for order, port, desc, hwid in sorted(comports(False)):
print "%-10s: %s (%s)" % (port, desc, hwid)