I am trying to send a tuple to a method of a python class and I got a Run failed from netbeans compiler
when I want to send a tuple to a simple method in a module it works,when I want to send a simple parameter to a method of a clas it works also but not a tuple to a method of a class
I put the code below,thanks for all the possible suggestions
Python Code:
class cVector:
def __init__(self,msg):
self.value = msg
def ComputeNorm(self,vecData):
#don't use vecData for instance
result = 12.
return(result)
C++ Code :
PyObject *ret, *mymod, *pclass, *method, *args, *object;
float retValue;
Py_Initialize();
//PySys_SetPath("/home/pascal/projPytCpp/proj1");
PySys_SetPath(".");
// Module
mymod = PyImport_ImportModule("mModule8");
if (mymod == NULL){
cout << "Can't Open a module:\n" ;
Py_DECREF(mymod);
}
// Class
pclass = PyObject_GetAttrString(mymod, "cVector");
if (pclass == NULL) {
Py_DECREF(pclass);
cout << "Can't find class\n";
}
// Parameters/Values
args = Py_BuildValue("(f)", 100.0);
if (args == NULL) {
Py_DECREF(args);
cout << "Can't build argument list for class instance\n";
}
// Object with parameter/value
object = PyEval_CallObject(pclass, args);
if (object == NULL) {
Py_DECREF(object);
cout << "Can't create object instance:\n";
}
// Decrement the argument counter as we'll be using this again
Py_DECREF(args);
// Get the object method - note we use the object as the object
// from which we access the attribute by name, not the class
method = PyObject_GetAttrString(object, "ComputeNorm");
if (method == NULL) {
Py_DECREF(method);
cout << "Can't find method\n";
}
// Decrement the counter for our object, since we now just need
// the method reference
Py_DECREF(object);
// Build our argument list - an empty tuple because there aren't
// any arguments
cout << "Prepare the Tuple:\n" ;
// WE pass a tuple
args = PyTuple_New( 3 );
if (args == NULL) {
Py_DECREF(args);
cout << "Can't build argument list for method call\n";
}
PyObject *py_argument;
// 1st argument
py_argument = PyFloat_FromDouble(5.);
PyTuple_SetItem(args, 0, py_argument);
// 2nd argument
py_argument = PyFloat_FromDouble(10.);
PyTuple_SetItem(args, 1, py_argument);
// 3nd argument
py_argument = PyFloat_FromDouble(15.);
PyTuple_SetItem(args, 2, py_argument);
cout << "Before the Exec:\n" ;
// Call our object method with arguments (try two ways to do it any works)
//ret = PyEval_CallObject(method,args);
ret = PyObject_CallObject(method,args);
if (ret == NULL) {
Py_DECREF(ret);
cout << "Couldn't call method\n";
}
// Convert the return value back into a C variable and display it
PyArg_Parse(ret, "f", &retValue);
printf("Farenheit: %f\n", retValue);
// Kill the remaining objects we don't need
Py_DECREF(method);
Py_DECREF(ret);
// Close off the interpreter and terminate
Py_Finalize();
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