We have this simple (test) script that defines a function that we want to call
via python's c api:
import pprint
import sys
counter= 0
def onInitialize(ctxt):
global counter
counter+=1
pprint.pprint(sys.path)
return counter
While executing this works fine from the python command line, when using
PyObject_CallObject to execute 'onInitialize', we're getting an error that
pprint was undefined: "name 'pprint' is not defined".
Moving the import statement into the function resolves the issue, but that
seems wrong, and won't work for us (we want our customers to be able to provide
their own implementation of onInitialize() and a bunch of other functions).
I'm assuming I'm missing something very basic, but I haven't found it...
The interesting thing is that the global variable counter is defined and
increments as desired/expected when calling the function via
PyObject_CallObject(.) repeatedly.
The environment is
Python 3.5.1 (64bit)
Win7
The source code is below, if anybody wants the vs solution, that can be
provided.
Thanks for your help,
Christian
#include "stdafx.h"
#include "Python.h"
void hackIt()
{
const char* const pTestScripts =
"import pprint\n"
"import sys\n"
"counter= 0\n"
"def onInitialize(ctxt):\n"
" global counter\n"
" counter+=1\n"
" pprint.pprint(sys.path)\n"
" return counter\n";
Py_Initialize();
PyObject* pModule = PyImport_AddModule("__main__");
PyObject* pPyMainDict = PyModule_GetDict(pModule);
_Py_static_string(PyId_string, "<string>");
PyObject* pFileName = _PyUnicode_FromId(&PyId_string);
PyObject* pScriptObject = Py_CompileStringObject(pTestScripts, pFileName,
Py_file_input, NULL, 0);
PyObject* pLocalDictionary = PyDict_New();
if (pScriptObject)
{
PyObject* pResult = PyEval_EvalCode(pScriptObject, pPyMainDict,
pLocalDictionary);
if (NULL != pResult)
{
PyObject* pFxnObj = PyDict_GetItemString(pLocalDictionary,
"onInitialize");
long retval = -1;
PyObject* pTuple = PyTuple_New(1);
PyObject* pParam = PyLong_FromLong(42);
PyTuple_SetItem(pTuple, 0, pParam); //tuple takes ownership of
pParam
PyObject* pResultObj = PyObject_CallObject(pFxnObj, pTuple);
Py_XDECREF(pTuple);
if (pResultObj)
{
printf("got a %ld\n", PyLong_AsLong(pResultObj));
Py_DECREF(pResultObj);
}
else
{
PyObject* pPyErr = NULL;
if (pPyErr = PyErr_Occurred())
{
const char* pStr = NULL;
PyObject* pTypeObj = NULL;
PyObject* pValueObj = NULL;
PyObject* pWhatObj = NULL;
PyErr_Fetch(&pTypeObj, &pValueObj, &pWhatObj);
if (pValueObj)
{
if (PyBytes_Check(pValueObj))
{
printf("Error: %s\n", PyBytes_AsString(pValueObj));
}
if (PyUnicode_Check(pValueObj))
{
wchar_t buffer[1024];
PyUnicode_AsWideChar(pValueObj, buffer, 1024);
printf("Error: %S\n", buffer);
}
}
Py_XDECREF(pWhatObj);
Py_XDECREF(pValueObj);
Py_XDECREF(pTypeObj);
}
}
}
}
Py_XDECREF(pLocalDictionary);
Py_XDECREF(pScriptObject);
Py_Finalize();
}
int _tmain(int argc, _TCHAR* argv[])
{
hackIt();
return 0;
}
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