swig

I am trying to reuse some old c code with SWIG and Python. Right now I am quite confused. The errors I get can be demonstrated on a small example: bsp.h: extern void add(int a[], int b[], int c[]); bsp.c: #include "bsp.h" void add(int a[], int b[], int c[]) { c[0] = a[0] + b[0]; c[1] = a[1] + b[1]; } bsp.i %module bsp %{ #include "bsp.h"; %} %include "bsp.h"; setup.py: #!/usr/bin/env python from distutils.core import setup, Extension bsp_module = Extension('_bsp', sources = ['bsp_wrap.c', 'bsp.c'] ) setup(name = 'bsp', ext_modules = [bsp_module], py_modules = ["bsp"] ) The example Python file

I've got some C code that I want to expose to Python. It has a calling convention like this: int add(int a, int b, int *err) where the return value would be (a+b) or whatever, but if something went wrong, then I would get an error code in *err. I want to wrap this function so that it behaves like this, from the Python perspective: def add(a,b): if something_bad: raise RuntimeError("something bad") return a+b This should be easy, right? But I'm not finding it so. Here is something that I have that works, but look out for the myerr3 kludge: %module myswig %feature("autodoc","1"); %{ int add(int

I am trying to install and use dolfin on Arch Linux, with Python 2.7.3. What is the best way to find out what is causing segmentation faults such as these? $ python2 -c "import dolfin; print dolfin.__version__" [3] 6491 segmentation fault (core dumped) python2 -c "import dolfin; print dolfin.__version__" I have tried inspecting the core file through gdb: $ sudo systemd-coredumpctl gdb 6491 but they are always truncated: Reading symbols from /usr/bin/python2.7...(no debugging symbols found)...done. BFD: Warning: /var/tmp/coredump-wSi8DV is truncated: expected core file size >= 39694336, found:

I'm using Swig to generate Java classes. I need to deal with a pointer on a pointer on a structure . I have this structure : struct Model { uint32_t serial; } And I have a function in the C/C++ that needs to be wrapped : void getModel( Model ** model ){ // instructions... } I get as a result this Java class : public class SWIGTYPE_p_p_Model { private long swigCPtr; protected SWIGTYPE_p_p_Model(long cPtr, boolean futureUse) { swigCPtr = cPtr; } protected SWIGTYPE_p_p_Model() { swigCPtr = 0; } protected static long getCPtr(SWIGTYPE_p_p_Model obj) { return (obj == null) ? 0 : obj.swigCPtr; } } So

Say I have following C++ code: /* File : example.h*/ typedef void (__stdcall *CppCallback)(int code, const char* message); class CppClass { public: CppClass() {}; void call(CppCallback callback) { callback(1234, "Hello from C++"); } }; And then I have C# counterpart: /* File : example.cs */ using System; using System.Text; public delegate void CSharpCallback(int code, string param); public class App { static void Main() { CppClass cppClass = new CppClass(); cppClass.call((i, s) => { Console.WriteLine("Code " + i + " and message '" + s + "'"); }); } } And then I have SWIG .i file gluing them

my task is to create dual program. At the beginning I start C program that calls throught C/C++ API of Python some Python method. The called method after that call a function that is created with SWIG. I show you my sample also with backtrace from gdb after I am given Segmentation fault. main.c: #include <Python.h> #include <stdio.h> #include "utils.h" int main(int argc, char** argv) { printf("Calling from C !\n"); increment(); int i; for(i = 0; i < 11; ++i) { Py_Initialize(); PyObject *pname = PyString_FromString("py_function"); PyObject *module = PyImport_Import(pname); PyObject *dict =