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SWIG Hello world
Calling C++ function from Pyhon
2014/12/20
Jacky Liu

? This slide organize instructions from ��Falldog�ĳ�
ʽ�� - [Python] Windows�� ʹ��SWIG��
C/C++��function�� (http://falldog7.blogspot.tw/2013/07/python-
swig-c-function.html)

Environment Setting
? OS (Windows 7 also works)
Windows 8.1
? Compiler
Visual Studio 2013 Update4
? Python (Other version may be incompatible)
python-3.3.5.msi (x86) [1]
? SWIG (Unzip and copy swigwin-3.0.2 folder to C:)
swigwin-3.0.2 [2]
[1] http://www.python.org/ftp/python/3.3.5/python-3.3.5.msi
[2] http://sourceforge.net/projects/swig/files/swigwin/swigwin-3.0.2/

SWIG Hello world
? Our goal is to call a simple C++ function from
python.
int AddOne(int n) { return n + 1; }
int Sqrt(int n) { return n*n; }
print(Sample.AddOne(1)) # >>> 2
print(Sample.Sqrt(2)) # >>> 4
C++
Python

New project
1. DLL
2. Empty project
3. Finish

Project setting
? Project setting - Include Python header files
> Right click >

Project setting
? Properties | Configuration Properties | VC++ Directories
Executable Directories: C:swigwin-3.0.2

Project setting
? Project | Properties | Configuration Properties | C/C++
Additional Include Directories: C:Python33include

Project setting
? Properties | Configuration Properties | Linker
Additional Library Directories: C:Python33libs

Project setting
? Properties | Configuration Properties | Build Events | Pre-Build Event
swig.exe -c++ -python -o $(ProjectDir)Sample_wrap.cxx $(ProjectDir)Sample.i

Add file
? Add Sample.h
#include "Python.h"
int AddOne(int n);
int Sqrt(int n);
PyObject* SqrtInPyObj(PyObject* obj);

Add file
? Add Sample.cpp
#include "Sample.h"
int AddOne(int n)
{
return n + 1;
}
int Sqrt(int n)
{
return n*n;
}
PyObject* SqrtInPyObj(PyObject* obj)
{
int n = PyLong_AsLong(obj);
return Py_BuildValue("i", n*n);
}

Add file
? Add Sample.i
%module Sample
%{
#include "Sample.h"
%}
%include "Sample.h"

Generate files
? Build ��Release�� (F7)
Generate
? $(ProjectDir)/Release/Sample.dll
? $(ProjectDir)/Sample/Sample.py
? $(ProjectDir)/Sample/Sample_wrap.cxx
? Add Sample_wrap.cxx back to project

Configure Linker output file name
$(OutDir)_$(ProjectName).pyd

Add preprocessor definitions
__WIN32__

Generate .pyd file for python
? Build ��Release�� (F7) again
Generate
? $(ProjectDir)/Release/_Sample.pyd

Try it in Python
? Copy
? $(ProjectDir)/Release/_Sample.pyd
? $(ProjectDir)/Sample/Sample.py
? To the same folder with your script
? Test.py
import Sample
print Sample.AddOne(1) # >>> 2
print Sample.Sqrt(2) # >>> 4
print Sample.Sqrt(3) # >>> 9
print Sample.SqrtInPyObj(2) # >>> 4
print Sample.SqrtInPyObj(3) # >>> 9

Reference
? Falldog�ĳ�ʽ�� - [Python] Windows�� ʹ��
SWIG��C/C++��function

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SWIG Hello World

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