How to convert a returned Python dictionary to a C++ std::map
I'm calling Python from C++, and trying to perform some data conversions.
For example, if I call the following Python function
def getAMap():
data =
data["AnItem 1"] = "Item value 1"
data["AnItem 2"] = "Item value 2"
return data
from C++ as:
PyObject *pValue= PyObject_CallObject(pFunc, NULL);
where pFunc is a PyObject* that points to the getAMap python function.
Code for setting up pFunc omitted for clarity.
The returned pointer, pValue is a pointer to a (among other things) Python dictionary.
Question is, how to get thh dictionary into a std::map on the C++ side as smoothly as possible?
I'm using C++ Builder bcc32 compiler that can't handle any fancy template code, like boost python, or C++11 syntax.
(Changed question as the python object is a dictionary, not a tuple)
python c++ c++builder
asked Apr 23 '18 at 19:49
Totte KarlssonTotte Karlsson
461629
|
show 4 more comments
I'm calling Python from C++, and trying to perform some data conversions.
For example, if I call the following Python function
def getAMap():
data =
data["AnItem 1"] = "Item value 1"
data["AnItem 2"] = "Item value 2"
return data
from C++ as:
PyObject *pValue= PyObject_CallObject(pFunc, NULL);
where pFunc is a PyObject* that points to the getAMap python function.
Code for setting up pFunc omitted for clarity.
The returned pointer, pValue is a pointer to a (among other things) Python dictionary.
Question is, how to get thh dictionary into a std::map on the C++ side as smoothly as possible?
I'm using C++ Builder bcc32 compiler that can't handle any fancy template code, like boost python, or C++11 syntax.
(Changed question as the python object is a dictionary, not a tuple)
python c++ c++builder
asked Apr 23 '18 at 19:49
Totte KarlssonTotte Karlsson
461629
Just found a library that makes it easy to convert Python objects (Python C API) to standard C++ datatypes as it says here. Looks like it might help you due to it also supportsstd::map.
– David Michael Huber
Apr 23 '18 at 20:09
Also, consider swig.
– Robᵩ
Apr 23 '18 at 20:09
Rob, I'm using swig in fact.
– Totte Karlsson
Apr 23 '18 at 20:12
David; that library looks great, but I can't use it with this compiler unfortunately.
– Totte Karlsson
Apr 23 '18 at 20:44
i would use PyTuple_GetItem and copy the values into a map. Or write a swig typemap that does it for you.
– Thomas
Apr 23 '18 at 20:49
|
show 4 more comments
I'm calling Python from C++, and trying to perform some data conversions.
For example, if I call the following Python function
def getAMap():
data =
data["AnItem 1"] = "Item value 1"
data["AnItem 2"] = "Item value 2"
return data
from C++ as:
PyObject *pValue= PyObject_CallObject(pFunc, NULL);
where pFunc is a PyObject* that points to the getAMap python function.
Code for setting up pFunc omitted for clarity.
The returned pointer, pValue is a pointer to a (among other things) Python dictionary.
Question is, how to get thh dictionary into a std::map on the C++ side as smoothly as possible?
I'm using C++ Builder bcc32 compiler that can't handle any fancy template code, like boost python, or C++11 syntax.
(Changed question as the python object is a dictionary, not a tuple)
python c++ c++builder
asked Apr 23 '18 at 19:49
Totte KarlssonTotte Karlsson
461629
I'm calling Python from C++, and trying to perform some data conversions.
For example, if I call the following Python function
def getAMap():
data =
data["AnItem 1"] = "Item value 1"
data["AnItem 2"] = "Item value 2"
return data
from C++ as:
PyObject *pValue= PyObject_CallObject(pFunc, NULL);
where pFunc is a PyObject* that points to the getAMap python function.
Code for setting up pFunc omitted for clarity.
The returned pointer, pValue is a pointer to a (among other things) Python dictionary.
Question is, how to get thh dictionary into a std::map on the C++ side as smoothly as possible?
I'm using C++ Builder bcc32 compiler that can't handle any fancy template code, like boost python, or C++11 syntax.
(Changed question as the python object is a dictionary, not a tuple)
python c++ c++builder
python c++ c++builder
asked Apr 23 '18 at 19:49
Totte KarlssonTotte Karlsson
461629
asked Apr 23 '18 at 19:49
Totte KarlssonTotte Karlsson
461629
edited Apr 24 '18 at 14:36
Totte Karlsson
asked Apr 23 '18 at 19:49
Totte KarlssonTotte Karlsson
461629
asked Apr 23 '18 at 19:49
Totte KarlssonTotte Karlsson
461629
asked Apr 23 '18 at 19:49
Totte KarlssonTotte Karlsson
461629
461629
Just found a library that makes it easy to convert Python objects (Python C API) to standard C++ datatypes as it says here. Looks like it might help you due to it also supportsstd::map.
– David Michael Huber
Apr 23 '18 at 20:09
Also, consider swig.
– Robᵩ
Apr 23 '18 at 20:09
Rob, I'm using swig in fact.
– Totte Karlsson
Apr 23 '18 at 20:12
David; that library looks great, but I can't use it with this compiler unfortunately.
– Totte Karlsson
Apr 23 '18 at 20:44
i would use PyTuple_GetItem and copy the values into a map. Or write a swig typemap that does it for you.
– Thomas
Apr 23 '18 at 20:49
|
show 4 more comments
Just found a library that makes it easy to convert Python objects (Python C API) to standard C++ datatypes as it says here. Looks like it might help you due to it also supportsstd::map.
– David Michael Huber
Apr 23 '18 at 20:09
Also, consider swig.
– Robᵩ
Apr 23 '18 at 20:09
Rob, I'm using swig in fact.
– Totte Karlsson
Apr 23 '18 at 20:12
David; that library looks great, but I can't use it with this compiler unfortunately.
– Totte Karlsson
Apr 23 '18 at 20:44
i would use PyTuple_GetItem and copy the values into a map. Or write a swig typemap that does it for you.
– Thomas
Apr 23 '18 at 20:49
Just found a library that makes it easy to convert Python objects (Python C API) to standard C++ datatypes as it says here. Looks like it might help you due to it also supports
std::map.– David Michael Huber
Apr 23 '18 at 20:09
Just found a library that makes it easy to convert Python objects (Python C API) to standard C++ datatypes as it says here. Looks like it might help you due to it also supports
std::map.– David Michael Huber
Apr 23 '18 at 20:09
Also, consider swig.
– Robᵩ
Apr 23 '18 at 20:09
Also, consider swig.
– Robᵩ
Apr 23 '18 at 20:09
Rob, I'm using swig in fact.
– Totte Karlsson
Apr 23 '18 at 20:12
Rob, I'm using swig in fact.
– Totte Karlsson
Apr 23 '18 at 20:12
David; that library looks great, but I can't use it with this compiler unfortunately.
– Totte Karlsson
Apr 23 '18 at 20:44
David; that library looks great, but I can't use it with this compiler unfortunately.
– Totte Karlsson
Apr 23 '18 at 20:44
i would use PyTuple_GetItem and copy the values into a map. Or write a swig typemap that does it for you.
– Thomas
Apr 23 '18 at 20:49
i would use PyTuple_GetItem and copy the values into a map. Or write a swig typemap that does it for you.
– Thomas
Apr 23 '18 at 20:49
|
show 4 more comments
1 Answer
1
active
oldest
votes
It's pretty ugly, but I came up with this:
std::map<std::string, std::string> my_map;
// Python Dictionary object
PyObject *pDict = PyObject_CallObject(pFunc, NULL);
// Both are Python List objects
PyObject *pKeys = PyDict_Keys(pDict);
PyObject *pValues = PyDict_Values(pDict);
for (Py_ssize_t i = 0; i < PyDict_Size(pDict); ++i)
// PyString_AsString returns a char*
my_map.insert( std::pair<std::string, std::string>(
*PyString_AsString( PyList_GetItem(pKeys, i) ),
*PyString_AsString( PyList_GetItem(pValues, i) ) );
answered Nov 13 '18 at 22:14
MajorMajor
371312
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
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active
oldest
votes
It's pretty ugly, but I came up with this:
std::map<std::string, std::string> my_map;
// Python Dictionary object
PyObject *pDict = PyObject_CallObject(pFunc, NULL);
// Both are Python List objects
PyObject *pKeys = PyDict_Keys(pDict);
PyObject *pValues = PyDict_Values(pDict);
for (Py_ssize_t i = 0; i < PyDict_Size(pDict); ++i)
// PyString_AsString returns a char*
my_map.insert( std::pair<std::string, std::string>(
*PyString_AsString( PyList_GetItem(pKeys, i) ),
*PyString_AsString( PyList_GetItem(pValues, i) ) );
answered Nov 13 '18 at 22:14
MajorMajor
371312
add a comment |
It's pretty ugly, but I came up with this:
std::map<std::string, std::string> my_map;
// Python Dictionary object
PyObject *pDict = PyObject_CallObject(pFunc, NULL);
// Both are Python List objects
PyObject *pKeys = PyDict_Keys(pDict);
PyObject *pValues = PyDict_Values(pDict);
for (Py_ssize_t i = 0; i < PyDict_Size(pDict); ++i)
// PyString_AsString returns a char*
my_map.insert( std::pair<std::string, std::string>(
*PyString_AsString( PyList_GetItem(pKeys, i) ),
*PyString_AsString( PyList_GetItem(pValues, i) ) );
answered Nov 13 '18 at 22:14
MajorMajor
371312
add a comment |
It's pretty ugly, but I came up with this:
std::map<std::string, std::string> my_map;
// Python Dictionary object
PyObject *pDict = PyObject_CallObject(pFunc, NULL);
// Both are Python List objects
PyObject *pKeys = PyDict_Keys(pDict);
PyObject *pValues = PyDict_Values(pDict);
for (Py_ssize_t i = 0; i < PyDict_Size(pDict); ++i)
// PyString_AsString returns a char*
my_map.insert( std::pair<std::string, std::string>(
*PyString_AsString( PyList_GetItem(pKeys, i) ),
*PyString_AsString( PyList_GetItem(pValues, i) ) );
answered Nov 13 '18 at 22:14
MajorMajor
371312
It's pretty ugly, but I came up with this:
std::map<std::string, std::string> my_map;
// Python Dictionary object
PyObject *pDict = PyObject_CallObject(pFunc, NULL);
// Both are Python List objects
PyObject *pKeys = PyDict_Keys(pDict);
PyObject *pValues = PyDict_Values(pDict);
for (Py_ssize_t i = 0; i < PyDict_Size(pDict); ++i)
// PyString_AsString returns a char*
my_map.insert( std::pair<std::string, std::string>(
*PyString_AsString( PyList_GetItem(pKeys, i) ),
*PyString_AsString( PyList_GetItem(pValues, i) ) );
answered Nov 13 '18 at 22:14
MajorMajor
371312
edited Nov 14 '18 at 17:00
answered Nov 13 '18 at 22:14
MajorMajor
371312
answered Nov 13 '18 at 22:14
MajorMajor
371312
answered Nov 13 '18 at 22:14
MajorMajor
371312
371312
add a comment |
add a comment |
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Just found a library that makes it easy to convert Python objects (Python C API) to standard C++ datatypes as it says here. Looks like it might help you due to it also supports
std::map.– David Michael Huber
Apr 23 '18 at 20:09
Also, consider swig.
– Robᵩ
Apr 23 '18 at 20:09
Rob, I'm using swig in fact.
– Totte Karlsson
Apr 23 '18 at 20:12
David; that library looks great, but I can't use it with this compiler unfortunately.
– Totte Karlsson
Apr 23 '18 at 20:44
i would use PyTuple_GetItem and copy the values into a map. Or write a swig typemap that does it for you.
– Thomas
Apr 23 '18 at 20:49