c++ - 通过 Python BOOST 使用派生类 (C++)

Question

我有我想在 Python 中使用的 C++ 类：

#include "ExtraClass.h"
class CApp
{
   ...
   ExtraClass Bar; //there is function Foo()
}

BOOST_PYTHON_MODULE( CApp )
{
class_<ExtraClass>("ExtraClass",init<>())
    .def("Foo",&ExtraClass::Foo)
    ;
    class_<CApp>("CApp", init<>()) 
    .def_readonly("Bar", &CApp::Bar)
    ;

编译没问题。所以我有 CApp.so 文件要在 Python 中导入。所以问题从 Python 开始：

from CApp import *
class pyApp(CApp):
def __init__(self):
    print "<--INIT-->"
CApp = CApp()
pyApp = pyApp()
print CApp.Bar.Foo()
print pyApp.Bar.Foo()

输出：

<--INIT-->
FOO // <- this is from CApp.Bar.Foo()
Traceback (most recent call last):
  File "./pytest.py", line 16, in <module>
print pyApp.Bar.Foo()
Boost.Python.ArgumentError: 
Python argument types in None.None(pyApp) 
did not match C++ signature: None(CApp {lvalue})

Answer 1

如果你在派生类中实现了一个init () 那么你需要确保调用基类init () 否则它将没有基类成员。

from CApp import *
class pyApp(CApp):
def __init__(self):
    CApp.__init__(self)
    print "<--INIT-->"
CApp = CApp()
pyApp = pyApp()
print CApp.Bar.Foo()
print pyApp.Bar.Foo()

我遇到了同样的问题并在这里找到了解决方案 - https://stackoverflow.com/a/6396839。