ctypes 不允许多次取消对指针的引用

我一直在努力通过ctypes将一些C++类扩展到python。 我首先尝试通过 GDB 和代码验证地址不等于 NULL。它确实不等于 NULL。我尝试通过 printf 打印出指针，它会打印出地址，但涉及指针的下一行代码会引发分段错误。奇怪的是，如果没有该 printf 语句，printf 语句之后的下一行代码将起作用。但是，下一个涉及指针的函数将抛出分割错误，就像 printf 一样。

这是我的代码供参考：

C++->C 型包装器

#include <jetfuelmedia.h>
#define MAX_FILE_NAME_SIZE 1024
extern "C"{
jetfuel::media::Music *Music_new(){
return new jetfuel::media::Music();
}
void Music_delete(jetfuel::media::Music *music){
puts("Destroyed Music object");
delete music;
}
bool Music_is_music_playing(){
return Mix_PlayingMusic();
}
bool Music_is_music_paused(){
return Mix_PausedMusic();
}
bool Music_load_music_file(jetfuel::media::Music *music,
const wchar_t *musicfilepath){
char musicfilepathchar[MAX_FILE_NAME_SIZE];
wcstombs(musicfilepathchar,musicfilepath,
MAX_FILE_NAME_SIZE);
puts("Music file is:");
puts(musicfilepathchar);
puts("Music ref is:");
printf("%p",music);
if(!music->Load_music_file(musicfilepathchar)){
puts(musicfilepathchar);
puts(Mix_GetError());
return false;
}
puts("C/C++ code ran");
return true;
}
bool Music_play(jetfuel::media::Music *music){
puts("C/C++ Play code ran");
return music->Play();
}
void Music_pause(jetfuel::media::Music *music){
music->Pause();
}
void Music_resume(jetfuel::media::Music *music){
music->Resume();
}
const char *Get_music_error(){
const char *sdlerror = Mix_GetError();
if(sdlerror == NULL){
return "Music object was equal to NULL";
}
return Mix_GetError();
}
}

Python 类包装器：

from ctypes import cdll
from ctypes import c_wchar_p
from ctypes import c_void_p
from ctypes import c_bool
class music():  
_jetfuel = None;
_musicref = None;
def __init__(self,jetfuelsofilepath):
self._jetfuel = cdll.LoadLibrary(jetfuelsofilepath);
self._musicref = self._jetfuel.Music_new();
def __enter__(self):
return self;
def __exit__(self, exc_type, exc_value, traceback):
if(self._musicref != None):
self._jetfuel.Music_delete(c_void_p(self._musicref));
def is_music_playing(self):
return self._jetfuel.Music_is_music_playing();
def is_music_paused(self):
return self._jetfuel.Music_is_music_paused();
def load_music_file(self, musicfilepath):
loadmusicfile = self._jetfuel.Music_load_music_file;
loadmusicfile.argtypes = [c_void_p, c_wchar_p];
loadmusicfile.restype = c_bool;
return loadmusicfile(c_void_p(self._musicref), 
c_wchar_p(musicfilepath));
def play(self):
return self._jetfuel.Music_play(c_void_p(self._musicref));
def pause(self):
self._jetfuel.Music_pause(c_void_p(self._musicref));
def resume(self):
self._jetfuel.Music_resume(c_void_p(self._musicref));
def print_debug(self):
print("Music ref is ="+str(c_void_p(self._musicref)));
def get_music_error(self):
return self._jetfuel.Get_music_error();

如何使此代码与可以多次取消引用的指针一起使用？

如果这涉及任何事情，我的系统信息是：

• Ubuntu 17.04 64 位
• GCC(G++( 5.4.1
• GDB 7.12.50
• 蟒蛇 3.6
• SDL 2.0.3