Python初始化段错误

Question

我正在使用boost.python构建应用程序.我有一些单例类命名ScriptsManager,它有以下功能initPython:

mMainModule = bp::import("__main__");
mMainNamespace = bp::import("__dict__");

bp::object ignored = bp::exec("hello = file('hello.txt', 'w')\n"
                  "hello.write('Hello world!')\n"
                  "hello.close()", mMainNamespace);

两者mMainModule, mMainNamespace都是boost::python::object.

所以,当我开始申请时,我得到:

Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) bt
#0  0x0000000000000000 in ?? ()
#1  0x00007ffff5d5efd9 in PyEval_GetGlobals () from /usr/lib/libpython2.7.so.1.0
#2  0x00007ffff5d79113 in PyImport_Import () from /usr/lib/libpython2.7.so.1.0
#3  0x00007ffff5d7935c in PyImport_ImportModule () from /usr/lib/libpython2.7.so.1.0
#4  0x00007ffff5a6d8bd in boost::python::import(boost::python::str) () from /usr/lib/libboost_python.so.1.46.0
#5  0x0000000000510b1b in ScriptsManager::initPython (this=0x7b6850) at /home/ockonal/Workspace/Themisto/src/Core/ScriptsManager.cpp:24
#6  0x0000000000547650 in Application::main (args=...) at /home/ockonal/Workspace/Themisto/src/main.cpp:60
#7  0x00007ffff4ebbf86 in main () from /usr/lib/libclan22App-2.2.so.1
#8  0x00007ffff24c4dcd in __libc_start_main () from /lib/libc.so.6
#9  0x00000000004c9769 in _start ()

这可能有什么问题？

---

UPD1

Py_Initialize()在bp::import我得到之前打电话的时候:

在抛出'boost :: python :: error_already_set'的实例后终止调用

---

UPD2

似乎问题出现在代码中:

mMainNamespace = bp::import("__dict__");

结果代码是:

Py_Initialize();
mMainModule = bp::import("__main__");
mMainNamespace = mMainModule.attr("__dict__");

我不确定这是对的.

---

UPD3

是的,2次更新有效.如此奇怪,mMainNamespace = bp::import("__dict__")是用官方提升文档编写的.

Answer 1

我认为你想要的是以下内容：

int main (int argc, char** argv)
{
    try
    {
        // If you're going to use threads: PyEval_InitThreads();
        Py_Initialize();
        PySys_SetArgv(argc, argv);

        bp::object mMainModule = bp::import('__main__');
        bp::object mMainNamespace = mMainModule.attr('__dict__');

        bp::object ignored = bp::exec("hello = file('hello.txt', 'w')\n"
              "hello.write('Hello world!')\n"
              "hello.close()", mMainNamespace);
   }
   catch (bp::error_already_set const&)
   {
        PyErr_Print();
   }
}

Py_Initialize()是必要的，try { ... } catch () { ... }-block 会生成一条 Python 错误消息，就像您从解释器中获得的错误消息一样，并且bp::import仅适用于模块，不适用于导入模块的属性:-)