C++ function prototype

Typedef structure

{

Unsigned long device type;

Int handle;

int NumberOfClients

Int serial number;

int MaxAllowedClients

} NeoDevice

Int _ stdcall icsnoefinndneodevices (unsigned long device type, NeoDevice *pNeoDevices, int * pnumberofdevices);

Use python as follows:

NeoDevice class (structure):

_fields_ = [("DeviceType "，c_ulong)，

(“Handle”，c_int)，

(“NumberOfClients”，c_int)，

("serial number", c_int),

(" MaxAllowedClients "，c_int)]

CNeoVICan class (CCanBase):

def __init__(self):

neoVi = windll.icsneo40

self . icsnoefindneodevices = neo VI . icsnoefindneodevices

if __name__ == "__main__ ":

canBus = cNeoVICan()

Print canBus.icsneoGetDLLVersion ()

iNumberOfDevices =[neo device()for x in range( 10)]

num = c_int

Iresult = canbus. icsnoefinndneodevices (c _ ulong (65535), pointer (iNumberOfDevices), byref(num))

However, the following error will be reported:

Backtracking (last call):

The file "c: \ work \ project \ GUI \ wxpycan303 \ DRV \ source \ src \ DRV \ neovi \ cneovican.py", line 224, is in the< module & gt

Iresult = canbus. icsnoefinndneodevices (c _ ulong (65535), pointer (iNumberOfDevices), byref(num))

Type error: _type_ must have storage information.

What is the reason for the mistake?

Thank you.

-Solutions.

Because python's list is not of type ctypes.

The correct way is

NeoDevice class (structure):

_fields_ = [("DeviceType "，c_ulong)，

(“Handle”，c_int)，

(“NumberOfClients”，c_int)，

("serial number", c_int),

(" MaxAllowedClients "，c_int)]

CNeoVICan class (CCanBase):

def __init__(self):

neoVi = windll.icsneo40

self . icsnoefindneodevices = neo VI . icsnoefindneodevices

if __name__ == "__main__ ":

canBus = cNeoVICan()

Print canBus.icsneoGetDLLVersion ()

iNumberOfDevices =(neo device * 10)()

num = c_int()

I result = CANbus . icsnoefindneodevices(c _ ulong(65535)，cast(iNumberOfDevices，POINT(NeoDevice))，byref(num))