使用python ctypes包装扁平化的c ++类方法，返回联合指针

    typedef struct {
    short Valid; // magic number
    short SizeX,SizeY;
    short Fps;
    short Shutter1,Shutter2; //Preview 1 and 2 Shutter, in lines (=ShutterTime[sec]*Fps*SizeY)
    short PreTrigPages;
    short Options;
    short BufStart;
    short BufEnd;
    short SeqLength;
    short ShiftCount;
    short DBS;
    short FN;
    short MAXBL;
} CAM_PARMS_V1;

union CAM_PARMS {
  CAM_PARMS_V1 p;
    BYTE bytes[128];
    unsigned long quads[32];
};

    //Function prototype
    virtual CAM_PARMS           *GetCamParms(void);

    //Use of function
    GetCamParms()->p.SizeX=640;

typedef CVitCamDLL *CameraHandle;

#define EXPORTCALL __declspec(dllexport) __stdcall

    CAM_HW EXPORTCALL GetCamParms(CameraHandle handle)
    {
        return *handle->GetCamParms();
    }

    import ctypes as ct
    from ctypes.util import find_library

    dll = find_library(\'VitCamC\')
    if dll == None:
        raise Exception(\"VitCamC.dll not found\")

    cam = ct.WinDLL(dll)

class CAM_PARMS_V1(ct.Structure):
    _fields_ = [(\"Valid\", ct.c_short),
                (\"SizeX\", ct.c_short),
                (\"SizeY\", ct.c_short),
                (\"Fps\", ct.c_short),
                (\"Shutter1\", ct.c_short),
                (\"Shutter2\", ct.c_short),
                (\"PreTrigPages\", ct.c_short),
                (\"Options\", ct.c_short),
                (\"BufStart\", ct.c_short),
                (\"BufEnd\", ct.c_short),
                (\"SeqLength\", ct.c_short),
                (\"ShiftCount\", ct.c_short),
                (\"DBS\", ct.c_short),
                (\"FN\", ct.c_short),
                (\"MAXBL\", ct.c_short)]

class CAM_PARMS(ct.Union):
    _fields_ = [(\"p\", CAM_PARMS_V1),
                (\"bytes\", ct.c_ubyte * 128),
                (\"quads\", ct.c_ulong * 32)]

    def get_cam_parms(handle, mode):

        cam.GetCamParms.restype = CAM_PARMS #This fixes it!

        return cam.GetCamHw(handle, ct.byref(mode))