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Alex Rivera
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I've developped a DLL for a driver in C. I wrote a test program in C++ and the DLL works fine. Now I'd like to interract with this DLL using Python. I've successfully hidden most of the user defined C structures but there is one point where I have to use C structures. I'm rather new to python so I may get things wrong. My approach is to redefine a few structures in python using ctype then pass the variable to my DLL. However in these class I have a custom linked list which contains recursive types as follow class EthercatDatagram(Structure): _fields_ = [("header", EthercatDatagramHeader), ("packet_data_length", c_int), ("packet_data", c_char_p), ("work_count", c_ushort), ("next_command", EthercatDatagram)] This fails, because inside EthercatDatagram, EthercatDatagram is not already defined so the parser returns an error. How should I represent this linked list in python so that my DLL understands it correctly?
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