c++ boost python列表提取导致分段错误

c++ boost python list extract causing Segmentation fault

本文关键字：分段 错误 提取 boost python 列表 c++      更新时间：2023-10-16

我遇到了boost python的一个奇怪问题。在试图对我的一些代码进行单元测试时，我发现在创建boost::python::列表并向其添加信息后，试图提取该数据会导致segfault。下面是我的问题的一个简单例子。

main.cpp 

#include <boost/python.hpp>
int main()
{
    boost::python::list testList;
    float a = 1.12;
    testList.append(a);
    // This line results in a seg fault
    float b = boost::python::extract<float>(testList[0]);
    return 0;
}

和我的CMakeLists.txt

cmake_minimum_required(VERSION 2.8.3)
project(boost_python_test)
find_package(Boost REQUIRED COMPONENTS system thread python)
find_package(PythonLibs REQUIRED)
IF(Boost_FOUND)
  SET(Boost_USE_STATIC_LIBS OFF)
  SET(Boost_USE_MULTITHREADED ON)
  SET(Boost_USE_STATIC_RUNTIME OFF)
ENDIF()
set(SOURCES_DIRECTORY ${PROJECT_SOURCE_DIR}/src)
set(PROJECT_SOURCES
${SOURCES_DIRECTORY}/main.cpp
)

include_directories(${Boost_INCLUDE_DIRS} ${PYTHON_INCLUDE_DIRS})
## Declare a cpp executable
add_executable(${PROJECT_NAME}
${SOURCES_DIRECTORY}/main.cpp
)
target_link_libraries(${PROJECT_NAME} ${Boost_LIBRARIES} ${PYTHON_LIBRARIES})

编译器输出为:

-- The C compiler identification is GNU 4.8.2
-- The CXX compiler identification is GNU 4.8.2
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Boost version: 1.54.0
-- Found the following Boost libraries:
--   system
--   thread
--   python
-- Found PythonLibs: /usr/lib/x86_64-linux-gnu/libpython2.7.so (found     version "2.7.6") 
-- Configuring done
-- Generating done
-- Build files have been written to:         /home/jordan/Git/boost_python_test/build

您必须使用Py_Initialize才能使其工作。看看嵌入Python。@eacousineau是这个解决方案背后的男人和真正的大脑。

#include <boost/python.hpp>
int main()
{
    // Need this line for it to work
    Py_Initialize();
    boost::python::list testList;
    float a = 1.12;
    testList.append(a);
    // This line no longer results in a seg fault
    float b = boost::python::extract<float>(testList[0]);
    return 0;
}
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