我一直在尋找到一個特別討厭的錯誤兩個共享庫 - 想從社會上找出來,如果這只是我太傻了(完全有可能),或者是有什麼奇怪的事情。導入它使用C++流入損壞的輸出蟒蛇結果
所以,複製的問題,你需要GCC 5.3和1.60提高。
首先pyt.cpp - >其編譯成libpyt.so
/*
* This inclusion should be put at the beginning. It will include <Python.h>.
*/
#include <boost/python.hpp>
#include <string>
#include <sstream>
/*
* This is the C++ function we write and want to expose to Python.
*/
const std::string hello1(const std::string& name) {
std::ostringstream str;
str << "Hello: " << name << ", here is a number: " << 10 << std::endl;
return str.str();
}
/*
* This is a macro Boost.Python provides to signify a Python extension module.
*/
BOOST_PYTHON_MODULE(libpyt) {
// An established convention for using boost.python.
using namespace boost::python;
// Expose the function hello2().
def("hello1", hello1);
}
二pyto.cpp - >其編譯使用到libpyto.so
/*
* This inclusion should be put at the beginning. It will include <Python.h>.
*/
#include <boost/python.hpp>
#include <string>
#include <sstream>
/*
* This is the C++ function we write and want to expose to Python.
*/
const std::string hello2(const std::string& name) {
std::ostringstream str;
str << "Hello: " << name << ", here is a number: " << 10 << std::endl;
return str.str();
}
/*
* This is a macro Boost.Python provides to signify a Python extension module.
*/
BOOST_PYTHON_MODULE(libpyto) {
// An established convention for using boost.python.
using namespace boost::python;
// Expose the function hello2().
def("hello2", hello2);
}
我編譯以下:
/usr/local/gcc5_3_0/bin/g++ -std=c++14 pyt.cpp -fPIC -shared -o libpyt.so -I /usr/local/boost1_60_0_gcc5_3_0/include/ -I /usr/include/python2.7/ -L /usr/local/boost1_60_0_gcc5_3_0/lib64/ -Wl,-Bstatic -l boost_python.pic -Wl,-Bdynamic -lpthread -lpython2.7 -ldl -lrt -static-libstdc++ -static-libgcc
/usr/local/gcc5_3_0/bin/g++ -std=c++14 pyto.cpp -fPIC -shared -o libpyto.so -I /usr/local/boost1_60_0_gcc5_3_0/include/ -I /usr/include/python2.7/ -L /usr/local/boost1_60_0_gcc5_3_0/lib64/ -Wl,-Bstatic -l boost_python.pic -Wl,-Bdynamic -lpthread -lpython2.7 -ldl -lrt -static-libstdc++ -static-libgcc
(忽略增強庫的.pic
擴展名,它只是一個靜態庫智慧。這是編譯-fPIC
^h對象 - 使用相同的編譯器)
現在,我只是將它們導入到蟒蛇,並調用hello1/2功能:
bash-4.2$ python
Python 2.7.5 (default, Sep 15 2016, 22:37:39)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import libpyt
>>> import libpyto
>>> libpyto.hello2("hello");
'Hello: hello, here is a number: 10\n'
>>> libpyt.hello1("hello");
'Hello: hello, here is a number: ' <<<!!! What???
>>>
bash-4.2$ python
Python 2.7.5 (default, Sep 15 2016, 22:37:39)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import libpyto
>>> import libpyt
>>> libpyt.hello1("Hello")
'Hello: Hello, here is a number: 10\n'
>>> libpyto.hello2("Hello")
'Hello: Hello, here is a number: ' <<<!!! What???
正如你所看到的,不論導入順序,第二個hello函數無法正確生成輸出。所以我的問題是,爲什麼流出的整數值失敗的第二個電話?
編輯:另一個數據點,啓用流的例外,導致std::bad_cast
被拋出的第二個電話。
輸出錯誤具體如何?它不明確或明顯 – MrJLP
@MrJLP,它缺少'10 \ n'。這就是我知道這個流是如何被破壞的,它不是流出整數10. – Nim
我很好奇,如果分配'int val = 10'會發生什麼情況,如果問題仍然存在,則打印出val。可能是一個提升錯誤。順便說一句,我會建議清楚地說明問題頂部的實際問題。 – MrJLP