C++ 扩展和嵌入 Python

http://wenku.baidu.com/view/01fa40116edb6f1aff001fce.html

BOOST_PYTHON_MODULE(pyUtil) {

def("Recognise", Recognise); }

所有示例都在Microsoft Windows XP Professional + Microsoft Visual

Studio .NET 2003 + Python2.4环境下测试通过，本文所用的Boost库为1.33版本。

参考资料

 [1] Python Documentation Release 2.4.1. 2005.3.30，如果您以默认方

式安装了Python2.4，那么该文档的位置在C:\Program Files\Python24\Doc\Python24.chm；

 [2] Michael Dawson. Python Programming for the Absolute Beginner.

Premier Press. 2003；

 [3] Mark Lutz. Programming Python, 2nd Edition. O''Reilly. 2001.3 ；  [4] Mark Hammond, Andy Robinson. Python Programming on Win32.

O''Reilly. 2000.1 ；

 Python主页：http://www.python.org；  Boost库主面：www.boost.org；

附1 text.txt

this is test text in text.txt. 附2 mymod.py import string

message = ''original string'' message =message+message msg_error="" try:

text_file = open("text.txt", "r") whole_thing = text_file.read()

print whole_thing text_file.close()

except IOError, (errno, strerror):

print "I/O error(%s): %s" % (errno, strerror) def transform(input):

#input = string.replace(input, ''life'', ''Python'') return string.upper(input) def change_msg(nul):

global message #如果没有此行，message是函数里头的局部变量 message=''string changed'' return message def r_file(nul):

return whole_thing def get_msg(nul): return message

附3 simplepy.h

#ifndef _SIMPLEPY_H_ #define _SIMPLEPY_H_

// simplepy.h v1.0

// Purpose: facilities for Embedded Python. // by hujinshan @2005年9月2日9:13:02 #include

using std::string; #include

//--------------------------------------------------------------------

// Purpose: ease the job to embed Python into C++ applications // by hujinshan @2005年9月2日9:13:18

//--------------------------------------------------------------------

class CSimplepy // : private noncopyable {

public:

///constructor CSimplepy() {

Py_Initialize();

pstr=NULL, pmod=NULL, pdict=NULL; pfunc=NULL, pargs=NULL; }

///destructor

virtual ~CSimplepy() {

Py_Finalize(); }

///import the user module

bool ImportModule(const char* mod_name) {

try{

pmod =

PyImport_ImportModule(const_cast(mod_name)); if(pmod==NULL) return false;

pdict = PyModule_GetDict(pmod); }

catch(...)

{

return false; }

if(pmod!=NULL && pdict!=NULL) return true; else

return false; }

///Executes the Python source code from command in the __main__ module.

///If __main__ does not already exist, it is created.

///Returns 0 on success or -1 if an exception was raised. ///If there was an error, there is no way to get the exception information.

int Run_SimpleString(const char* str) {

return PyRun_SimpleString(const_cast(str) ); }

///PyRun_String("message", Py_eval_input, pdict, pdict); ///Execute Python source code from str in the context specified by the dictionaries globals.

///The parameter start specifies the start token that should be used to parse the source code. ///Returns the result of executing the code as a Python object, or NULL if an exception was raised. string Run_String(const char* str) {

char *cstr;

pstr = PyRun_String(str, Py_eval_input, pdict, pdict);

if(pstr==NULL)

throw ("when Run_String, there is an exception was raised by Python environment.");

PyArg_Parse(pstr, "s", &cstr); return string(cstr); }

///support olny one parameter for python function, I think it''s just enough.

string CallObject(const char* func_name, const char* parameter) {

pfunc=NULL;

pfunc = PyObject_GetAttrString(pmod, const_cast(func_name)); if(pfunc==NULL)

throw (string("do not found in Python module for: ")

+func_name).c_str(); char* cstr;

pargs = Py_BuildValue("(s)", const_cast(parameter)); pstr = PyEval_CallObject(pfunc, pargs); if(pstr==NULL)

throw ("when PyEval_CallObject, there is an exception was raised by Python environment"); PyArg_Parse(pstr, "s", &cstr); return string(cstr); }

//PyObject *args;

//args = Py_BuildValue("(si)", label, count); /* make arg-list */

//pres = PyEval_CallObject(Handler, args); protected:

PyObject *pstr, *pmod, *pdict; PyObject *pfunc, *pargs; };

#endif // _SIMPLEPY_H_ // end of file