Python c++ wrapper : Convert multi-type struct to it's python representation (preferable dictionary)
I've chosen setuptools to use my C/C++ code from python scripts.
One of the phases when building such wrapper is to convert the C/C++ return value into python object.
So far I was able to convert simple primitive values and list of primitive values. However, I wish to extend it to multi-value struct, as shown in the example below.
My main challenge right now is how do I create the python struct representation (PyObject* ret = PyList_New(...);) and I do I set it's values properly with the different types.
I tried to create list of items from the same types (such as std::vector<float>) and manage to set the values properly using Py_BuildValue and PyList_SetItem, but I'm still struggling with the multi types...
typedef struct _fileParams
{
bool valid;
int index;
std::string key;
std::value value;
} fileParams;
FileDataBase * db;
static PyObject *searchFileInDB(PyObject *self, PyObject *args)
{
if (db == NULL)
{
PyErr_SetString(PyExc_RuntimeError, "DB could not be initialized");
return NULL;
}
char* fileName = NULL;
int fileNameSize = 0;
PyArg_ParseTuple(args, "s#", &fileName, &fileNameSize);
try
{
fileParams p;
bool res = db->lookup(fileName, fileNameSize, p);
PyObject* ret = PyList_New(...);
if (res)
{
PyObject* r1 = Py_BuildValue("b", p.valid);
PyList_SetItem(ret, 0, r1);
PyObject* r2 = Py_BuildValue("i", p.index);
PyList_SetItem(ret, 1, r2);
PyObject* r1 = Py_BuildValue("s", p.key);
PyList_SetItem(ret, 2, r3);
PyObject* r1 = Py_BuildValue("s", p.value);
PyList_SetItem(ret, 3, r4);
}
return ret;
} catch (...) {
PyErr_SetString(PyExc_RuntimeError, "failed with C exception");
return NULL;
}
}
python c++ c swig setuptools
asked Nov 18 '18 at 7:50
Zohar81Zohar81
2,1221832
add a comment |
I've chosen setuptools to use my C/C++ code from python scripts.
One of the phases when building such wrapper is to convert the C/C++ return value into python object.
So far I was able to convert simple primitive values and list of primitive values. However, I wish to extend it to multi-value struct, as shown in the example below.
My main challenge right now is how do I create the python struct representation (PyObject* ret = PyList_New(...);) and I do I set it's values properly with the different types.
I tried to create list of items from the same types (such as std::vector<float>) and manage to set the values properly using Py_BuildValue and PyList_SetItem, but I'm still struggling with the multi types...
typedef struct _fileParams
{
bool valid;
int index;
std::string key;
std::value value;
} fileParams;
FileDataBase * db;
static PyObject *searchFileInDB(PyObject *self, PyObject *args)
{
if (db == NULL)
{
PyErr_SetString(PyExc_RuntimeError, "DB could not be initialized");
return NULL;
}
char* fileName = NULL;
int fileNameSize = 0;
PyArg_ParseTuple(args, "s#", &fileName, &fileNameSize);
try
{
fileParams p;
bool res = db->lookup(fileName, fileNameSize, p);
PyObject* ret = PyList_New(...);
if (res)
{
PyObject* r1 = Py_BuildValue("b", p.valid);
PyList_SetItem(ret, 0, r1);
PyObject* r2 = Py_BuildValue("i", p.index);
PyList_SetItem(ret, 1, r2);
PyObject* r1 = Py_BuildValue("s", p.key);
PyList_SetItem(ret, 2, r3);
PyObject* r1 = Py_BuildValue("s", p.value);
PyList_SetItem(ret, 3, r4);
}
return ret;
} catch (...) {
PyErr_SetString(PyExc_RuntimeError, "failed with C exception");
return NULL;
}
}
python c++ c swig setuptools
asked Nov 18 '18 at 7:50
Zohar81Zohar81
2,1221832
add a comment |
I've chosen setuptools to use my C/C++ code from python scripts.
One of the phases when building such wrapper is to convert the C/C++ return value into python object.
So far I was able to convert simple primitive values and list of primitive values. However, I wish to extend it to multi-value struct, as shown in the example below.
My main challenge right now is how do I create the python struct representation (PyObject* ret = PyList_New(...);) and I do I set it's values properly with the different types.
I tried to create list of items from the same types (such as std::vector<float>) and manage to set the values properly using Py_BuildValue and PyList_SetItem, but I'm still struggling with the multi types...
typedef struct _fileParams
{
bool valid;
int index;
std::string key;
std::value value;
} fileParams;
FileDataBase * db;
static PyObject *searchFileInDB(PyObject *self, PyObject *args)
{
if (db == NULL)
{
PyErr_SetString(PyExc_RuntimeError, "DB could not be initialized");
return NULL;
}
char* fileName = NULL;
int fileNameSize = 0;
PyArg_ParseTuple(args, "s#", &fileName, &fileNameSize);
try
{
fileParams p;
bool res = db->lookup(fileName, fileNameSize, p);
PyObject* ret = PyList_New(...);
if (res)
{
PyObject* r1 = Py_BuildValue("b", p.valid);
PyList_SetItem(ret, 0, r1);
PyObject* r2 = Py_BuildValue("i", p.index);
PyList_SetItem(ret, 1, r2);
PyObject* r1 = Py_BuildValue("s", p.key);
PyList_SetItem(ret, 2, r3);
PyObject* r1 = Py_BuildValue("s", p.value);
PyList_SetItem(ret, 3, r4);
}
return ret;
} catch (...) {
PyErr_SetString(PyExc_RuntimeError, "failed with C exception");
return NULL;
}
}
python c++ c swig setuptools
asked Nov 18 '18 at 7:50
Zohar81Zohar81
2,1221832
I've chosen setuptools to use my C/C++ code from python scripts.
One of the phases when building such wrapper is to convert the C/C++ return value into python object.
So far I was able to convert simple primitive values and list of primitive values. However, I wish to extend it to multi-value struct, as shown in the example below.
My main challenge right now is how do I create the python struct representation (PyObject* ret = PyList_New(...);) and I do I set it's values properly with the different types.
I tried to create list of items from the same types (such as std::vector<float>) and manage to set the values properly using Py_BuildValue and PyList_SetItem, but I'm still struggling with the multi types...
typedef struct _fileParams
{
bool valid;
int index;
std::string key;
std::value value;
} fileParams;
FileDataBase * db;
static PyObject *searchFileInDB(PyObject *self, PyObject *args)
{
if (db == NULL)
{
PyErr_SetString(PyExc_RuntimeError, "DB could not be initialized");
return NULL;
}
char* fileName = NULL;
int fileNameSize = 0;
PyArg_ParseTuple(args, "s#", &fileName, &fileNameSize);
try
{
fileParams p;
bool res = db->lookup(fileName, fileNameSize, p);
PyObject* ret = PyList_New(...);
if (res)
{
PyObject* r1 = Py_BuildValue("b", p.valid);
PyList_SetItem(ret, 0, r1);
PyObject* r2 = Py_BuildValue("i", p.index);
PyList_SetItem(ret, 1, r2);
PyObject* r1 = Py_BuildValue("s", p.key);
PyList_SetItem(ret, 2, r3);
PyObject* r1 = Py_BuildValue("s", p.value);
PyList_SetItem(ret, 3, r4);
}
return ret;
} catch (...) {
PyErr_SetString(PyExc_RuntimeError, "failed with C exception");
return NULL;
}
}
python c++ c swig setuptools
python c++ c swig setuptools
asked Nov 18 '18 at 7:50
Zohar81Zohar81
2,1221832
asked Nov 18 '18 at 7:50
Zohar81Zohar81
2,1221832
edited Nov 18 '18 at 8:46
Zohar81
asked Nov 18 '18 at 7:50
Zohar81Zohar81
2,1221832
asked Nov 18 '18 at 7:50
Zohar81Zohar81
2,1221832
asked Nov 18 '18 at 7:50
Zohar81Zohar81
2,1221832
2,1221832
add a comment |
add a comment |
1 Answer
1
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oldest
votes
You probably want to look into the Dictionary Object: Dictionary Objects
I'm guessing you'd want to set values with PyDict_SetItemString() as per that doc.
HTH
answered Nov 18 '18 at 12:26
e.dane.dan
5,60811522
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You probably want to look into the Dictionary Object: Dictionary Objects
I'm guessing you'd want to set values with PyDict_SetItemString() as per that doc.
HTH
answered Nov 18 '18 at 12:26
e.dane.dan
5,60811522
add a comment |
You probably want to look into the Dictionary Object: Dictionary Objects
I'm guessing you'd want to set values with PyDict_SetItemString() as per that doc.
HTH
answered Nov 18 '18 at 12:26
e.dane.dan
5,60811522
add a comment |
You probably want to look into the Dictionary Object: Dictionary Objects
I'm guessing you'd want to set values with PyDict_SetItemString() as per that doc.
HTH
answered Nov 18 '18 at 12:26
e.dane.dan
5,60811522
You probably want to look into the Dictionary Object: Dictionary Objects
I'm guessing you'd want to set values with PyDict_SetItemString() as per that doc.
HTH
answered Nov 18 '18 at 12:26
e.dane.dan
5,60811522
answered Nov 18 '18 at 12:26
e.dane.dan
5,60811522
answered Nov 18 '18 at 12:26
e.dane.dan
5,60811522
answered Nov 18 '18 at 12:26
e.dane.dan
5,60811522
5,60811522
add a comment |
add a comment |
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