boost python hello程序导入错误
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Import Error on boost python hello program
提问by user216056
include
包括
using namespace boost::python;
struct World{
void set(std::string msg) { this->msg = msg; }
std::string greet() { return msg; }
std::string msg;
};
BOOST_PYTHON_MODULE(hello)
{
class_<World>("World")
.def("greet", &World::greet)
.def("set", &World::set)
;
}
Compile and build ok
编译构建ok
~/boost$ g++ -fPIC -I/usr/include/python2.6 -c hello.cpp
~/boost$ g++ -shared hello.o -o hello.so
But when import from python side, got error.
但是当从 python 端导入时，出现错误。
>>> import hello.so
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: ./hello.so: undefined symbol: _ZNK5boost6python7objects21py_function_impl_base9max_arityEv
>>>
回答by tr9sh
Solved this via "No such file or directory" error with Boost Python
通过Boost Python 的“No such file or directory”错误解决了这个问题
g++ -c -fPIC hello.cpp -o hello.o
g++ -shared -Wl,-soname,hello.so -o hello.so hello.o -lpython2.6 -lboost_python
did the trick for me. I hope this is as clear as possible as i was struggling with this for about half an hour now ;)
帮我解决了这个问题。我希望这尽可能清楚，因为我现在已经为此挣扎了大约半个小时；）
回答by Yu Huang
same as other post here
与此处的其他帖子相同
g++ -c -fPIC hello.cpp -o hello.o
g++ -shared -Wl,-soname,hello.so -o hello.so hello.o -lpython2.6 -lboost_python
But i want to stress the importance of the position of "-lpython2.6 -lboost_python". If you put them in front of input files (hello.o), they will be somehow ignored (not linked to the final hello.so). This is at least true for g++ (Ubuntu/Linaro 4.6.3-1ubuntu5).
但我想强调“-lpython2.6 -lboost_python”位置的重要性。如果你把它们放在输入文件 (hello.o) 的前面，它们会以某种方式被忽略（不链接到最终的 hello.so）。至少对于 g++ (Ubuntu/Linaro 4.6.3-1ubuntu5) 来说是这样。
To be simple, http://ubuntuforums.org/showthread.php?t=496287suggested:
简单来说，http: //ubuntuforums.org/showthread.php?t=496287建议：
g++ <.cpp or .o file(s)> [LDFLAGS] [LIBS] -o [appname]
回答by user216056
Oh, I just saw this post:
哦，我刚看到这个帖子：
and problem solved
并解决了问题
回答by Jakobovski
I had the same issue and it turned out that I was missing a constructor on my class.
我遇到了同样的问题，结果发现我的班级缺少构造函数。
