Cfrgtkky

I have the following python code… and want to write this Code in… Python-C-API

from enum import Enum

class MqWaitOnEventE(Enum):                                                                                        

  NO  = 0

  ONCE = 1

  FOREVER = 2

Thanks for help.

FIRST approach

// enum definition 

PyObject *enumModO=NULL, *enumDictO=NULL, *intEnumO=NULL;                                                              

LngErrorCheckN(enumModO   = PyImport_ImportModule("enum"));                                                            

LngErrorCheckN(enumDictO  = PyModule_GetDict(enumModO));                                                               

LngErrorCheckN(intEnumO   = PyDict_GetItemString(enumDictO,"IntEnum"));                                                



// get 'MqWaitOnEventE '

PyObject *dictMqWaitOnEventE = NULL, *result=NULL, *base=NULL;                                                         

LngErrorCheckN(dictMqWaitOnEventE = PyDict_New());                                                                     

LngErrorCheck(PyDict_SetItemString (dict, "__module__", PyUnicode_FromString("pymsgque")));                            

LngErrorCheck(PyDict_SetItemString (dict, "NO",         OT_NEW_INT_OBJ(MQ_WAIT_NO)));                                  

LngErrorCheck(PyDict_SetItemString (dict, "ONCE",       OT_NEW_INT_OBJ(MQ_WAIT_ONCE)));                                

LngErrorCheck(PyDict_SetItemString (dict, "FOREVER",    OT_NEW_INT_OBJ(MQ_WAIT_FOREVER)));                             

LngErrorCheckN(base = PyTuple_Pack(1, intEnumO));                                                                      

LngErrorCheckN(result = PyObject_CallFunction((PyObject *)&PyType_Type, "sOO","MqWaitOnEventE", base, dictMqWaitOnEventE));                                   

end with following error…

Traceback (most recent call last):

  File "…/MyServer.py", line 14, in <module>

    import pymsgque

  File "…/python3.7/enum.py", line 151, in __new__

    enum_members = {k: classdict[k] for k in classdict._member_names}

AttributeError: 'dict' object has no attribute '_member_names'

what is this? … does python require som internals from me ?

This is the type-safe solution for a enum in C-Module initialization file…

• 
  MqBuffer… is my string buffer class


• 
  NS(…) is a macro to create a unique namespace… I use this for all c-extern objects
  .

the example will create the new MqSlaveE class in the module namespace.

PyObject* m = PyModule_Create(&ModuleDef);

...



MQ_BUF buf = MqBufferCreate(1000);

MqBufferAppendC(buf,"from enum import IntEnumn");

MqBufferAppendC(buf,"class MqSlaveE(IntEnum):n");

MqBufferAppendV(buf,"  LOOPBACK = %in", MQ_SLAVE_LOOPBACK);

MqBufferAppendV(buf,"  OTHER    = %in", MQ_SLAVE_OTHER);

MqBufferAppendV(buf,"  FILTER   = %in", MQ_SLAVE_FILTER);

MqBufferAppendV(buf,"  MASTER   = %in", MQ_SLAVE_MASTER);

MqBufferAppendV(buf,"  USER     = %in", MQ_SLAVE_USER);



PyObject *g, *dl, *dg, *v;

MQ_CST script = MqBufferGetC_e(buf);

g = PyImport_AddModule("__main__");

dg = PyModule_GetDict(g);

dl = PyModule_GetDict(m);

LngErrorCheckN(v = PyRun_String(script, Py_file_input, dg, dl));

Py_DECREF(v);



NS(MqSlaveE) = PyDict_GetItemString(dl,"MqSlaveE");



MqBufferDelete(&buf);

return m;

to check the object and extract the value I use a proc…

enum MqErrorE NS(Get_Enum_FromObj) (PyObject *enumT, PyObject *enumE, MQ_INT *ret) {                               

  if (!PyObject_IsInstance(enumE, enumT)) {                                                                        

    PyErr_Format(PyExc_TypeError,                                                                                  

        "input_enum_type = '%s' is not the required_enum_type = '%s'",                                             

                    Py_TYPE(enumE)->tp_name,     ((PyTypeObject*)enumT)->tp_name                                   

    );                                                                                                             

    return MQ_ERROR;                                                                                               

  }                                                                                                                

  return PyObj_AsINT(enumE,ret);                                                                                   

}