将Cython中的C结构包装/转换为Python类

我刚刚开始熟悉Cython,试图将一些C语言结构包装到Python方法和类中.我真正不了解的是如何从(初始化的)C结构转换到相应的Python类应该可行.我在这里想念的是什么:

C头文件的片段:

struct test_struct {
    int _something;
    complex_struct* _another;
};
typedef struct test_struct test;

test *test_new(void);
int some_method(test **n, int irrelevant);

来自我的.pxd的相应片段:

cdef struct test_struct:
    pass
ctypedef test_struct test

test* test_new()
int some_method(test **n, int irrelevant)

我的.pyx:

def do_something(int irrelevant):
    cdef test* t = test_new()
    ret = some_method(&t, irrelevant)

    # Here comes the problem...
    return t

cdef class Test:  
    cdef test* _t

    # cinit here and some methods here. No members except _t

返回声明的所有内容都可以正常工作.我得到一个正确的值ret,等等.但返回语句中的强制转换似乎不正确或缺少更多信息.发出t = do_something(42)Python段错误时.

段错误本身并没有帮助:

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7a9e74b in internal_print () from /usr/lib/libpython2.7.so.1.0
(gdb) bt
#0  0x00007ffff7a9e74b in internal_print () from /usr/lib/libpython2.7.so.1.0
#1  0x00007ffff7a81adb in PyFile_WriteObject () from /usr/lib/libpython2.7.so.1.0
#2  0x00007ffff7b19acb in sys_displayhook () from /usr/lib/libpython2.7.so.1.0
#3  0x00007ffff7a64c23 in PyObject_Call () from /usr/lib/libpython2.7.so.1.0
#4  0x00007ffff7af2ff7 in PyEval_CallObjectWithKeywords () from /usr/lib/libpython2.7.so.1.0
#5  0x00007ffff7af6f3b in PyEval_EvalFrameEx () from /usr/lib/libpython2.7.so.1.0
#6  0x00007ffff7af91b0 in PyEval_EvalCodeEx () from /usr/lib/libpython2.7.so.1.0
#7  0x00007ffff7af92b2 in PyEval_EvalCode () from /usr/lib/libpython2.7.so.1.0
#8  0x00007ffff7b11f9f in run_mod () from /usr/lib/libpython2.7.so.1.0
#9  0x00007ffff7b13ec0 in PyRun_InteractiveOneFlags () from /usr/lib/libpython2.7.so.1.0
#10 0x00007ffff7b140ae in PyRun_InteractiveLoopFlags () from /usr/lib/libpython2.7.so.1.0
#11 0x00007ffff7b1470e in PyRun_AnyFileExFlags () from /usr/lib/libpython2.7.so.1.0
#12 0x00007ffff7b24bcf in Py_Main () from /usr/lib/libpython2.7.so.1.0
#13 0x00007ffff746f000 in __libc_start_main () from /usr/lib/libc.so.6
#14 0x000000000040073e in _start ()

如您所见,该do_something方法应返回Test类型的Python对象.我需要添加什么才能使演员成功？我是否需要手动将结构映射到Python类？我可以使用一些Cython魔法吗？