1>c:\ffpython-master\ffpython.h(37): error C2899: typename cannot be used outside a template declaration
1>c:\ffpython-master\ffpython.h(37): error C2065: 'T' : undeclared identifier
1>c:\ffpython-master\ffpython.h(37): error C2955: 'type_ref_traits_t' : use of class template requires template argument list
1> c:\ffpython-master\ffpython.h(32) : see declaration of 'type_ref_traits_t'
1>c:\ffpython-master\ffpython.h(37): error C2027: use of undefined type 'type_ref_traits_t'
1> c:\ffpython-master\ffpython.h(32) : see declaration of 'type_ref_traits_t'
1>c:\ffpython-master\ffpython.h(37): error C2146: syntax error : missing ';' before identifier 'value_t'

error C2899: typename cannot be used outside a template declaration
error C2955: 'type_ref_traits_t' : use of class template requires template argument list

here are two typical error from the logs.

under cygwin, i use gcc compile example.cpp also got errors
$ gcc example.cpp -I /usr/include/python2.7/
In file included from example.cpp:7:0:
ffpython.h:38:37: 错误：‘T’在此作用域中尚未声明
typedef typename type_ref_traits_t::value_t value_t;
^
ffpython.h:38:38: 错误：模板第 1 个参数无效
typedef typename type_ref_traits_t::value_t value_t;
^
In file included from example.cpp:7:0:
ffpython.h:1083:26: 错误：‘pyoption_t’不是一个模板
struct pyoption_traits_t<pyoption_t >
^
ffpython.h:1083:8: 错误：部分特例化中未用到模板参数：
struct pyoption_traits_t<pyoption_t >
^
ffpython.h:1083:8: 错误： ‘T’
ffpython.h:1318:24: 错误：‘pyoption_t’不是一个模板
struct pytype_traits_t<pyoption_t >
^
ffpython.h:1318:8: 错误：部分特例化中未用到模板参数：
struct pytype_traits_t<pyoption_t >
^
ffpython.h:1318:8: 错误： ‘T’

i guess fanchy should be a chinese developer . chinese would not be a issue to read . so i would like to use chinese to feedback some issue about the ffpython

1 ffpython使用的是 STL::string 类作为参数传输， ffptyon 本身是作为配适器的方式嵌入到 C++ 代码中， 单纯以string 的方式传参， 对于宽字符的处理存在极大的不便， 尤其是以VS MFC 默认使用宽字符的方式， 涉及到字符类型的转换， 岂止headache 了得。
建议： ffpython 是否应该考虑支持 wstring ， 例如自定义 tstring
根据系统环境， 再自动选择 是string， 还是wstring。 以此提供更好的 对非 ansi 码支持

Thank you for the code. I got the following error when trying to embed python script in C++.

Traceback (most recent call last):
File "", line 1, in
SystemError: nameless module
Traceback (most recent call last):
File "", line 8, in
NameError: name 'ffpython' is not defined
Traceback (most recent call last):
File "", line 11, in
NameError: name 'ffpython' is not defined
Traceback (most recent call last):
File "", line 10, in
NameError: name 'ffpython' is not defined
Traceback (most recent call last):
File "", line 6, in
NameError: name 'ffpython' is not defined
sys.version=
ValueError: Empty module name

Here is the code Im running

std::shared_ptr<ff::FFPython> _ffpython;
_ffpython = std::make_shared<ff::FFPython>();
printf("sys.version=%s\n", _ffpython->getVar<std::string>("sys", "version").c_str());

This run fine in python2.7, however, the error appeared when I switched to python3.5

我在MFC中使用，把#include "ffpython.h"放在stdafx.h下编译不通过
使用代码

    Py_IsInitialized();
    std::string szArticleContent = CStringA(m_csArticleContent).GetString();
    ffpython_t ff;
    ff.call<void>("CSTBlogPost", "writeArticleContent", szArticleContent);
    Py_Finalize();

错误代码如下

1>stdafx.obj : error LNK2005: "public: static int __cdecl pyops_t::traceback(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > &)" (?traceback@pyops_t@@SAHAAV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) 已经在 CSTBlogPost.obj 中定义
1>stdafx.obj : error LNK2005: "public: static int __cdecl pycall_t::call_func(struct _object *,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,struct pycall_arg_t &,class pytype_tool_t &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > &)" (?call_func@pycall_t@@SAHPAU_object@@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@1AAUpycall_arg_t@@AAVpytype_tool_t@@AAV34@@Z) 已经在 CSTBlogPost.obj 中定义
1>D:\SystemFolder\Documents\Visual Studio 2008\Projects\CST-BlogPush\Release\CSTBlogPost.exe : fatal error LNK1169: 找到一个或多个多重定义的符号

as a flesh programmer , it is not easy to use ffpython well according my experience .
1 the way to call python function in C++ environment is not safe ,
for example
in pytest. py module , there is a function
def py_mytest(var):
print "hello , this is my first test" , var
in C++ .cpp module
ffpython.call("pytest", "py_mytest","good luck"):

it's impossible for the IDE to detect the error ,or give any warming , once time i enter the incorrect module name , or function name ("pytest", "py_mytest") . the software will directly crash . it is really dangerous . the first time , i had cost lots of time to debug the error .
advice : will there any mechanism to give some warming or throw the exception once time , the module name , function name , class name , got wrong ??

2 ffpython for embeding python into c++ solution only support released version
as a test , only support released version would be ok . but at work , i really have no confidence to take this solution to embed python in my program . i had tried to find the python27_d.lib and python27_d.dll to solve this issue .. it did cost lots of time and energy . what we pursue is to make programing more simple and efficient , are not we .
thanks for your hard work .

linux下编译增加gcc选项-c -O2 -Wall 编译失败，这问题有解？
In file included from /usr/include/python2.7/Python.h:80:0,
from ffpython.h:4,
from example.cpp:6:
ffpython.h: In member function ‘int ffpython_t::init_pyclass(PyObject_)’:
/usr/include/python2.7/object.h:767:22: warning: dereferencing type-punned pointer will break strict-aliasing rules -Wstrict-aliasing->ob_refcnt++)
^
ffpython.h:1274:13: note: in expansion of macro ‘Py_INCREF’
Py_INCREF(&m_all_pyclass[i].pytype_def);
^
ffpython.h: In static member function ‘static PyObject_ pytype_traits_t::pyobj_from_cppobj(bool)’:
/usr/include/python2.7/object.h:767:22: warning: dereferencing type-punned pointer will break strict-aliasing rules -Wstrict-aliasing->ob_refcnt++)
^
/usr/include/python2.7/boolobject.h:27:31: note: in expansion of macro ‘Py_INCREF’
#define Py_RETURN_TRUE return Py_INCREF(Py_True), Py_True
^
ffpython.h:1705:13: note: in expansion of macro ‘Py_RETURN_TRUE’
Py_RETURN_TRUE;
^
/usr/include/python2.7/object.h:767:22: warning: dereferencing type-punned pointer will break strict-aliasing rules -Wstrict-aliasing->ob_refcnt++)
^
/usr/include/python2.7/boolobject.h:28:32: note: in expansion of macro ‘Py_INCREF’
#define Py_RETURN_FALSE return Py_INCREF(Py_False), Py_False
^
ffpython.h:1707:9: note: in expansion of macro ‘Py_RETURN_FALSE’
Py_RETURN_FALSE;
^
In file included from example.cpp:6:0:
ffpython.h: In member function ‘pyext_tool_t& pyext_tool_t::parse_arg(T&)’:
ffpython.h:2213:56: warning: typedef ‘value_t’ locally defined but not used [-Wunused-local-typedefs]
typedef typename type_ref_traits_t::value_t value_t;
^
example.cpp: In function ‘void test_cpp_obj_py_obj(ffpython_t&)’:
example.cpp:140:12: warning: variable ‘p’ set but not used [-Wunused-but-set-variable]
foo_t* p = ffpython.call<foo_t*>("fftest", "test_cpp_obj_py_obj", &tmp_foo);
^
In file included from /usr/include/python2.7/Python.h:87:0,
from ffpython.h:4,
from example.cpp:6:
ffpython.h: In instantiation of ‘static PyObject* pyclass_base_info_t::release(PyTypeObject_, PyObject_) [with T = foo_t; PyObject = object; PyTypeObject = typeobject]’:
ffpython.h:700:25: required from ‘pyclass_regigster_tool_t& ffpython_t::reg_class(const string&, std::string, std::string) [with T = foo_t; CTOR = int ()(int); std::string = std::basic_string]’
example.cpp:106:48: required from here
/usr/include/python2.7/boolobject.h:24:46: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
#define Py_True ((PyObject *) &Py_TrueStruct)
^
/usr/include/python2.7/boolobject.h:27:51: note: in expansion of macro ‘Py_True’
#define Py_RETURN_TRUE return Py_INCREF(Py_True), Py_True
^
ffpython.h:433:17: note: in expansion of macro ‘Py_RETURN_TRUE’
Py_RETURN_TRUE;
^
ffpython.h: In instantiation of ‘static PyObject pyclass_base_info_t::release(PyTypeObject, PyObject_) [with T = dumy_t; PyObject = object; PyTypeObject = typeobject]’:
ffpython.h:700:25: required from ‘pyclass_regigster_tool_t& ffpython_t::reg_class(const string&, std::string, std::string) [with T = dumy_t; CTOR = int ()(int); std::string = std::basic_string]’
example.cpp:112:103: required from here
/usr/include/python2.7/boolobject.h:24:46: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
#define Py_True ((PyObject ) &Py_TrueStruct)
^
/usr/include/python2.7/boolobject.h:27:51: note: in expansion of macro ‘Py_True’
#define Py_RETURN_TRUE return Py_INCREF(Py_True), Py_True
^
ffpython.h:433:17: note: in expansion of macro ‘Py_RETURN_TRUE’
Py_RETURN_TRUE;
^
In file included from example.cpp:6:0:
ffpython.h: In static member function ‘static PyObject pyext_func_traits_t<RET ()(ARG1, ARG2, ARG3, ARG4)>::pyfunc(PyObject, PyObject_) [with RET = int; ARG1 = int; ARG2 = float; ARG3 = const std::basic_string&; ARG4 = const std::vector&; PyObject = object]’:
ffpython.h:2287:94: warning: ‘a2’ may be used uninitialized in this function [-Wmaybe-uninitialized]
return pytype_traits_t::pyobj_from_cppobj(f(a1.value, a2.value, a3.value, a4.value));
^
ffpython.h:2667:33: note: ‘a2’ was declared here
type_ref_traits_t a2;
^
In file included from /usr/include/string.h:640:0,
from /usr/include/python2.7/Python.h:38,
from ffpython.h:4,
from example.cpp:6:
In function ‘void* memcpy(void, const void_, size_t)’,
inlined from ‘pyclass_regigster_tool_t& pyclass_regigster_tool_t::reg(FUNC, const string&, std::string) [with FUNC = int (foo_t::)()const; std::string = std::basic_string]’ at ffpython.h:542:9,
inlined from ‘void test_register_base_class(ffpython_t&)’ at example.cpp:107:39:
/usr/include/x86_64-linux-gnu/bits/string3.h:51:71: warning: call to void builtin___memcpy_chk(void, const void, long unsigned int, long unsigned int) will always overflow destination buffer [enabled by default]
return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (dest));
^
In function ‘void* memcpy(void, const void, size_t)’,
inlined from ‘pyclass_regigster_tool_t& pyclass_regigster_tool_t::reg(FUNC, const string&, std::string) [with FUNC = void (foo_t::)(int); std::string = std::basic_string]’ at ffpython.h:542:9,
inlined from ‘void test_register_base_class(ffpython_t&)’ at example.cpp:108:39:
/usr/include/x86_64-linux-gnu/bits/string3.h:51:71: warning: call to void builtin___memcpy_chk(void, const void, long unsigned int, long unsigned int) will always overflow destination buffer [enabled by default]
return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (dest));
^
In function ‘void* memcpy(void, const void, size_t)’,
inlined from ‘pyclass_regigster_tool_t& pyclass_regigster_tool_t::reg(FUNC, const string&, std::string) [with FUNC = void (foo_t::)(std::mapstd::basic_string<char, std::list >&); std::string = std::basic_string]’ at ffpython.h:542:9,
inlined from ‘void test_register_base_class(ffpython_t&)’ at example.cpp:109:37:
/usr/include/x86_64-linux-gnu/bits/string3.h:51:71: warning: call to void builtin___memcpy_chk(void, const void, long unsigned int, long unsigned int) will always overflow destination buffer [enabled by default]
return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (dest));
^
In function ‘void* memcpy(void, const void, size_t)’,
inlined from ‘pyclass_regigster_tool_t& pyclass_regigster_tool_t::reg(FUNC, const string&, std::string) [with FUNC = void (dumy_t::)(); std::string = std::basic_string]’ at ffpython.h:542:9,
inlined from ‘void test_register_base_class(ffpython_t&)’ at example.cpp:113:36:
/usr/include/x86_64-linux-gnu/bits/string3.h:51:71: warning: call to void builtin___memcpy_chk(void, const void, long unsigned int, long unsigned int) will always overflow destination buffer [enabled by default]
return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest));

g++ -o app_py27 example.cpp -I"C:/Python27/include" -L"C:/Python27/libs" -lpython27

编译成功

运行./app_py27.exe

第一个函数test_base 测试中
ffpython.set_global_var("fftest", "global_var", "OhNice"); 运行正确

printf("fftest.global_var=%s\n", ffpython.get_global_var("fftest", "global_var").c_str()); 运行异常 【type invalid】

其中在fftest.py的第一个函数中增加

global global_var
print global_var, type(global_var)

测试结果global_var为 long型

请问这个是什么问题？

issue have been solve . it belong to my python file which could not load files

hi fanchy
ffpython add specified file path by use add_path() or run_string to do this work .
after view the source code : the mechanism to load module in python is :

char buff[1024];
        SAFE_SPRINTF(buff, sizeof(buff), "import sys\nif '%s' not in 
sys.path:\n\tsys.path.append('%s')\n", path_.c_str(), path_.c_str());
        PyRun_SimpleString(buff);

but in the mixed programming , python files maybe located in several directory . once i use the add-path () , it seems the library didnot support to change the specified file path any more .
like following code :

{   ffpython_t  I_pythoner;
    ffpython_t::add_path("./py_file/");
    i_pythoner.call<void>("test_module", "sayhi");      
   # ffpython_t::add_path("./child_dir/");                     
    #i_pythoner.call<void>("test_module2", "sayhi");       # could not  find the module 
}

current directory
----py_file
--------test_module.py
--------child_dir
------------test_module.py

question

could ffpython support multiple - paths module loading ? if it could , what do i supposed to do ?

系统:window7 64位
python:2.7.9 64位
第1592行
PyObject *pArgs = PyTuple_New(pyclass_base_info_t::pytype_info.total_args_num+1);
未被释放,会引起内存泄漏.

How do I do this ?

        FFPython ffpython;
	
        ffpython.regClass<Foo(int)>("Foo")
		.regMethod(&Foo::getValue, "getValue")
		.regMethod(&Foo::setValue, "setValue")
		.regMethod(&Foo::testStl, "testStl")
		.regField(&Foo::nValue, "nValue");

         

Then I want to call from C++

     int rv = ffpython.call????<int>("module_name", "getValue");  
     ffpython.call????<int>("module_name", "setValue", 55);

Thank you

hey , i got i issue which refer the object handle .
when i define a class in Xx.py file , let's give it a nane , like pyclass .
in python file , it is easy to call the class initial funciton to creat a object , and then call the class method . for example :
obj=pyclass()
obj.sayhi() // pyclass method
in the c++ files , what i could do is to call class initiation funciton like
ffpython_t ffpython;
ffpython.call("XX", "pyclass"); // run the pyclass initiation funciton ，　without class instance handle

but without the class definition , i could not get the class instance handle to call the class method ,
the only method to solve such a issue is to define a class in c++ , and register it into the python class which wil inherent the pyclass , then to call the class relative method . but it's really headache . could you give any better solution ?
email: [email protected]

Hi,
Great job, easy integration. Thank you.

What work around I have to make to return an object instance from a C++
function to python ?

class A{
public:
        A(){}
        ~A(){}
        void method(){ printf("%s\n",__FUNCTION__)};
};

A a;
/*
 ...
*/
A& Another::returnA(){
    return a;
}

/*
 ...
*/
e.regClass<Another()>("Another")..regMethod(&Another::returnA,"returnA");
e.regClass<A()>("A")..regMethod(&A::method,"method");

PY, something like

another = ffpython.Another()
theA = another.returnA()
theA.method()

Yields errors as:

ffpython/ffpython.h: In instantiation of ‘PyObject* ff::ScriptMethodImpl<RET (CLASS_TYPE::*)()>::handleRun() [with CLASS_TYPE = AeProcess; RET = AeDriver&; PyObject = _object]’:
ffpython/ffpython.h:1390:23:   required from here
fpython/ffpython.h:1392:48: error: incomplete type ‘ff::ScriptCppOps<A&>’ used in nested name specifier
 1392 |         return ScriptCppOps<RET>::scriptFromCpp(((CLASS_TYPE*)pobjArg->*func)());
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~