python - PyUnicode_AsUTF8() 段错误

Question

#include <Python.h>

int
main (int argc, char *argv[])
{
    PyObject *pName, *pModule, *pFunc;
    PyObject *pValue;

    Py_Initialize ();

    pName = PyUnicode_FromString ("uuid");

    pModule = PyImport_Import (pName);
    Py_DECREF (pName);

    pFunc = PyObject_GetAttrString (pModule, "uuid4");

    pValue = PyObject_CallObject (pFunc, NULL);

    printf ("%s\n", PyUnicode_AsUTF8 (pValue));

    Py_Finalize ();

    return 0;
}

编译为

gcc test.c `python3.4-config --cflags --ldflags`

我得到了Segmentation fault。如何解决这个问题？我想要的是从 uuid4() 取回字符串。谢谢。

Answer 1

我可以通过一些修改成功地让它编译并打印出值:

#include <Python.h>
#include <stdio.h>

int
main (int argc, char *argv[])
{
    PyObject *pName, *pModule, *pFunc;
    PyObject *pValue;

    Py_Initialize ();

    pName = PyUnicode_FromString ("uuid");

    pModule = PyImport_Import (pName);
    Py_DECREF (pName);

    pFunc = PyObject_GetAttrString (pModule, "uuid4");

    pValue = PyObject_CallObject (pFunc, NULL);

    PyObject_Print(pValue, stdout, Py_PRINT_RAW); // my change
    printf ("\n"); // make the printout look nicer

    Py_Finalize ();

    return 0;
}

这是输出:

$ ./a.out
bd94cb52-9278-41a8-bc5a-ad05eff91188

我认为你的问题的原因很可能是:编译python的编译器与你用来编译测试程序test.c的编译器不一样。您可以找到正确的 gcc 版本来编译您的代码，或者简单地使用您当前的 gcc 编译器重新编译 python3.4。

至于你的原始版本的 test.c，它在我的 MBP 上给出了这个错误:

$ ./a.out
(null)
Exception ignored in: <module 'threading' from '/usr/local/Frameworks/Python.framework/Versions/3.4/lib/python3.4/threading.py'>
Traceback (most recent call last):
  File "/usr/local/Frameworks/Python.framework/Versions/3.4/lib/python3.4/threading.py", line 1292, in _shutdown
    t = _pickSomeNonDaemonThread()
  File "/usr/local/Frameworks/Python.framework/Versions/3.4/lib/python3.4/threading.py", line 1299, in _pickSomeNonDaemonThread
    for t in enumerate():
  File "/usr/local/Frameworks/Python.framework/Versions/3.4/lib/python3.4/threading.py", line 1269, in enumerate
    return list(_active.values()) + list(_limbo.values())
TypeError: bad argument type for built-in operation

我真的不知道发生了什么。