FAQ
I am running my C++ / Python App on a MacBook Pro with 2.5 installed

I have had some success in that I can load a module, get the class,
get the reference, but when the python class calls another python
class I don't ever seem to get the object back from the constructor.

I am doing the following in the C++ file:

Py_Initialize()
PyObject* module = PyImport_Import(moduleName);
PyObject* class = PyObject_GetAttrString(module, className);

Py_DECREF(module);
Py_DECREF(class);

// Create the TSAFE object constructor arguments:
// a file, and an int
PyObject* tsafeOutputFile = PyFile_FromString("TsafeOutput", "a");
PyObject* resolveValue = PyInt_FromLong(0);

PyObject* classArgumentTuple = PyTuple_New(2);
PyTuple_SetItem(classArgumentTuple, 0, tsafeOutputFile);
PyTuple_SetItem(classArgumentTuple, 1, resolveValue);

classReference = PyEval_CallObject(class, classArgumentTuple);
Py_MY_INCREF(classReference);
Py_MY_DECREF(class);

PyObject* pythonMethod = PyObject_GetAttrString(classReference,
"registerFlight");

registerReturn = PyEval_CallObject(pythonMethod, argumentTuple);
Py_MY_DECREF(pythonMethod);
Py_MY_DECREF(argumentTuple);


Essentially the code above should:

call class constructor
call registerFlight()
calls registerFlight_()
calls _flightPointer() -> where I never get by the
section of
code where the
Flight.py Constructor
get called

Each flight should be added to my class object to build up a
dictionary
of flights.

The python class methods getting called are detailed below and I never
get by the
call to _flightPointer(). I have opened a file and write to it at
each step of
code and I never get all the way through the _flightPointer() method

Is there something I am missing here I cannot print the data out of
the
__init__ method in the Flight.py file?

I did not include all of the code here because I am hoping the issue
is I
have got something wrong and it's not the python code but me.

Ant help will be greatly appreciated.

def registerFlight(self, ID, ACtype="?", IFR=1, RVSM=0, ATCcat="?",
filedAlt=0, filedSpeed=0):
"register flight (unitless args for outside client)"

filedAlt *= FL # FL = Flight Level = 100 ft
filedSpeed *= kn # kn = knots

self.registerFlight_(ID, ACtype, IFR, RVSM, ATCcat,
filedAlt,filedSpeed)

def registerFlight_(self, ID, ACtype="?", IFR=1, RVSM=0, ATCcat="?",
filedAlt=0, filedSpeed=0):
"register flight (accepts arguments with units)"

flight = self._flightPointer(ID)

flight.registerFlight(ACtype, IFR, RVSM, ATCcat, filedAlt,
filedSpeed)

def _flightPointer(self, ID, track=0, Flight=Flight):
"manage tracked and untracked flight lists"

fltPointerFile = open('TSAFE_flightPointerOut', 'a')
fltPointerFile.write("In the _flightPointer function\n")

flights = self.flights
unflights = self.untrackedFlights

if ID in flights:
fltPointerFile.write("in first IF\n")
return flights[ID]

if track: # new data record is a track update - start tracking
if ID in unflights: # move flight to tracked status
flights[ID] = unflights[ID]
del unflights[ID]
else: flights[ID] = Flight(ID) # new Flight object
return flights[ID]

## THIS IS THE SECTION OF CODE NOT RETURNING A REFERENCE TO
THE Flight object
if ID not in unflights:
fltPointerFile.write(ID)
fltPointerFile.write(" In if ID not in unflights\n\n")

unflights[ID] = Flight(ID)

fltPointerFile.write("BACK FROM CALLING Flight(ID)\n")

unflightsValue = ("unflights[ID]", unflights[ID])
unflightsString = str(unflightsValue)
fltPointerFile.write("Return value is ")
fltPointerFile.write(unflightsString)
fltPointerFile.write('\n')

return unflights[ID]

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postedMar 26, '08 at 8:33p
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