Go Hybrid programming for Python and C + + under Linux

Recently doing a Cuda project, documenting the learning experience.

System

Linux 3.11.0-19-generic #33-ubuntu x86_64 gnu/linux

C + + calls Python

Python Module code:

1 #!/usr/bin/python 2 #Filename: testmodule.py 3 def hello (s): 4     print "Hello World" 5     print s 6  7 def Add (A, B ): 8     print ' a= ', a 9     print ' b= ', B10     return a + B11 class test:13     def __init__ (self):         print "Init "     def SayHello (self, name):         print" Hello, ", Name17         return name

C + + code:

 1 #include <iostream> 2 #include <Python.h> 3 using namespace std; 4 int main (int argc, char* argv[]) 5 {6//Initialize Python 7 py_initialize (); 8 9//Run Python code directly pyrun_simple  String ("print ' Python Start '); 11 12//Introduce the current path, otherwise the module below cannot be imported into pyrun_simplestring (" Import sys ");  Pyrun_simplestring ("Sys.path.append ('./')"); 15 16//Introduction module Pyobject *pmodule = Pyimport_importmodule ("Testmodule"); 18//Get module dictionary properties pyobject *pdict = P     Ymodule_getdict (Pmodule); 20 21//direct access to functions in module pyobject *pfunc = pyobject_getattrstring (Pmodule, "Hello"); 23 24 Parameter type conversion, passing a string. Convert a C + + type string to a Python type, the Python type in the tuple view python document Pyobject *parg = Py_buildvalue ("(s)", "Hello Charity"); 26 27/Call Direct access to the function and pass parameters to Pyeval_callobject (PFunc, PARG); 29 30//Get function from dictionary attribute = PFunc = pydict_getitemstring (pdict, "ADD") ; 32//parameter type conversion, pass two integer parameter parg = Py_buildvalue ("(I, I)", 1, 2), 34 35//Call function, and get the return value of Python type Pyobject *resu lt = pyeval_calLOBject (PFunc, PARG); The PNs//c is used to hold the return value of the C + + type. int c;39//Convert the return value of the Python type to C + + type-pyarg_parse (result, "I", &AMP;C); 41//Output return value in printf ("a+b=%d\n", c); 43 44//Dictionary property gets the class in the module Pyobject *pclass = Pydict_getitemstrin     G (Pdict, "Test"); 46 47//instantiation Gets the class Pyobject *pinstance = Pyinstance_new (pClass, NULL, NULL); 49//method of calling Class 50 result = Pyobject_callmethod (pinstance, "SayHello", "(s)", "Charity"); 51//Output return value. char* name=null;53 PYARG_PA RSE (result, "s", &name); printf ("%s\n", name), pyrun_simplestring ("print ' Python End '); 57 58//Release P Ython59 py_finalize (); GetChar (); return 0;62}

Compile:

g++-i/usr/include/python2.7 pythonwithcpp.cpp-lpython2.7

Operation Result:

Python Starthello Worldhello charitya= 1b= 2a+b=3inithello, Charitycharitypython End

Python calls C + +

C + + code:

1//In C + + must be in front of function with extern "C" 2 extern "C" int Add (int a,int b) 3 {4     return a+b;5}

Compile:

1 g++-c-fpic libpythontest.cpp2 g++-shared libpythontest.o-o libpythontest.so

Python code:

1 #!/bin/python2 #Filename:P ythoncallcpp.py3 from ctypes import os5 libpythontest = Cdll. LoadLibrary ('./libpythontest.so ') 6 print libpythontest.add (+)

Run:

1 python pythoncallcpp.py

Operation Result:

2

[]linux Python and C + + mixed programming