python - iTunes 共享库中 PyObject_Call() 的段错误

Question

我正在尝试 iTunes SDK 和 Cython。 DLL 入口点似乎可以工作，但使用任何“真正的 Python” 都会导致 iTunes 崩溃。

以下代码可以正常编译，并且 iTunes 可以成功加载插件 dll。

cimport libc.stdio      as stdio

cdef extern from "iTunesAPI/iTunesAPI.h":

    ctypedef int    OSType
    ctypedef int    OSStatus

    ctypedef struct PluginMessageInfo:
        pass

    int             unimpErr

cdef public OSStatus iTunesPluginMain( OSType               message,
                                       PluginMessageInfo*   messageInfo,
                                       void*                refCon ):
    cdef stdio.FILE*    fl = stdio.fopen('C:/itunes_cyplugin_feedback.txt', 'wb')
    return unimpErr

但是添加 Python 表达式会导致 iTunes 崩溃，例如:

# ...

cdef public OSStatus iTunesPluginMain( OSType               message,
                                       PluginMessageInfo*   messageInfo,
                                       void*                refCon ):
    object()
    return unimpErr

您知道为什么这会导致崩溃吗？

操作系统:Windows 7 x64
iTunes:10.5 x86
编译器:gcc 4.6.2 (MinGW)

<小时/>

编辑[2012/02/12]

新的见解给了我gdb session ，您可以在下面找到它。我希望现在有人可以告诉我如何解决它。 :)

C:\Program Files (x86)\iTunes>gdb iTunes.exe
GNU gdb (GDB) 7.3.1
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "mingw32".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from c:\program files (x86)\itunes\iTunes.exe...(no debugging symbols found)...done.
(gdb) b write
No symbol table is loaded.  Use the "file" command.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 1 (write) pending.
(gdb) r
Starting program: c:\program files (x86)\itunes\iTunes.exe
[New Thread 4588.0xa20]
[New Thread 4588.0x1214]
[New Thread 4588.0x12f4]
[New Thread 4588.0x274]
[New Thread 4588.0x1070]
[New Thread 4588.0xf40]
[New Thread 4588.0xfb0]
[New Thread 4588.0x12b0]
[New Thread 4588.0xb48]
[New Thread 4588.0x58c]
[New Thread 4588.0xc7c]
[New Thread 4588.0x1048]
[New Thread 4588.0x8ac]
[New Thread 4588.0x10dc]
[New Thread 4588.0x190]
[New Thread 4588.0x128]
[New Thread 4588.0xfbc]
[New Thread 4588.0xc2c]
[New Thread 4588.0x1154]
[New Thread 4588.0x234]
[New Thread 4588.0xa70]
[New Thread 4588.0x1144]
[New Thread 4588.0xa48]
[New Thread 4588.0xbe8]
warning: ASL checking for logging parameters in environment variable "iTunes.exe.log"

warning: ASL checking for logging parameters in environment variable "asl.log"

BFD: C:\Windows\SysWOW64\WMVCORE.DLL: Warning: Ignoring section flag IMAGE_SCN_MEM_NOT_PAGED in section .reloc

Program received signal SIGSEGV, Segmentation fault.
0x1e0650bc in python27!PyObject_Call () from C:\Windows\SysWOW64\python27.dll
(gdb)
(gdb) bt all
No symbol "all" in current context.
(gdb) bt
#0  0x1e0650bc in python27!PyObject_Call () from C:\Windows\SysWOW64\python27.dll
#1  0x02eb12ae in iTunesPluginMain (__pyx_v_message=1768843636, __pyx_v_messageInfo=0x16e6b0, __pyx_v_refCon=0x0)
    at pytunes.c:465
#2  0x68a4d627 in iTunes!getPhaseStreamLibraryVersion () from c:\program files (x86)\itunes\iTunes.dll
#3  0x696e6974 in iTunesMainEntryPoint@24 () from c:\program files (x86)\itunes\iTunes.dll
#4  0x00000000 in ?? ()
(gdb)

这是 Visual Studio 2008 告诉我的:

Unhandled exception at 0x1e0650bc in iTunes.exe: 0xC0000005
Segmentation fault when reading at 0x00000004.

<小时/>

编辑[2012/02/13]

以下是 iTunes 崩溃后 (gdb) 线程 apply all bt 的输出。

(gdb) thread apply all bt

Thread 24 (thread 4340.0x4e0):
#0  0x76e564f4 in ntdll!LdrFindResourceEx_U () from C:\Windows\system32\ntdll.dll
#1  0x76e55e6c in ntdll!ZwWriteVirtualMemory () from C:\Windows\system32\ntdll.dll
#2  0x7504179c in WaitForSingleObjectEx () from C:\Windows\system32\KernelBase.dll
#3  0x0000067c in ?? ()
#4  0x00000000 in ?? ()

Thread 23 (thread 4340.0x17a0):
#0  0x76e564f4 in ntdll!LdrFindResourceEx_U () from C:\Windows\system32\ntdll.dll
#1  0x76178f8f in UnregisterPowerSettingNotification () from C:\Windows\system32\user32.dll
#2  0x59bd3485 in iTunesMobileDevice!AFCConnectionGetStatus ()
   from C:\Program Files\Common Files\Apple\Mobile Device Support\iTunesMobileDevice.dll
#3  0x06fef87c in ?? ()
#4  0x00000000 in ?? ()

Thread 22 (thread 4340.0x10c4):
#0  0x76e564f4 in ntdll!LdrFindResourceEx_U () from C:\Windows\system32\ntdll.dll
#1  0x76e55e7c in ntdll!ZwYieldExecution () from C:\Windows\system32\ntdll.dll
#2  0x76e4067b in ntdll!RtlLargeIntegerShiftLeft () from C:\Windows\system32\ntdll.dll
#3  0x76511174 in KERNEL32!AcquireSRWLockExclusive () from C:\Windows\system32\kernel32.dll
#4  0x76e6b3f5 in ntdll!RtlInsertElementGenericTableAvl () from C:\Windows\system32\ntdll.dll
#5  0x76e6b3c8 in ntdll!RtlInsertElementGenericTableAvl () from C:\Windows\system32\ntdll.dll
#6  0x00000000 in ?? ()

Thread 21 (thread 4340.0x14ec):
#0  0x76e564f4 in ntdll!LdrFindResourceEx_U () from C:\Windows\system32\ntdll.dll
#1  0x76e55e6c in ntdll!ZwWriteVirtualMemory () from C:\Windows\system32\ntdll.dll
#2  0x7504179c in WaitForSingleObjectEx () from C:\Windows\system32\KernelBase.dll
#3  0x0000063c in ?? ()
#4  0x00000001 in ?? ()
#5  0x06edf8c0 in ?? ()
#6  0x73ae556e in CreatePropertySheetPageA ()
   from C:\Windows\WinSxS\x86_microsoft.windows.common-controls_6595b64144ccf1df_6.0.7600.16385_none_421189da2b7fabfc\co
mctl32.dll
#7  0x7650f003 in WaitForSingleObjectEx () from C:\Windows\system32\kernel32.dll
#8  0x765d6172 in ole32!CoRevokeClassObject () from C:\Windows\system32\ole32.dll
#9  0x765dc80b in ole32!CoIsOle1Class () from C:\Windows\system32\ole32.dll
#10 0x76511174 in KERNEL32!AcquireSRWLockExclusive () from C:\Windows\system32\kernel32.dll
#11 0x76e6b3f5 in ntdll!RtlInsertElementGenericTableAvl () from C:\Windows\system32\ntdll.dll
#12 0x76e6b3c8 in ntdll!RtlInsertElementGenericTableAvl () from C:\Windows\system32\ntdll.dll
#13 0x00000000 in ?? ()

Thread 20 (thread 4340.0x1628):
#0  0x76e564f4 in ntdll!LdrFindResourceEx_U () from C:\Windows\system32\ntdll.dll
#1  0x76e55e6c in ntdll!ZwWriteVirtualMemory () from C:\Windows\system32\ntdll.dll
#2  0x7504179c in WaitForSingleObjectEx () from C:\Windows\system32\KernelBase.dll
#3  0x00000650 in ?? ()
#4  0x00000001 in ?? ()
#5  0x00000000 in ?? ()

Thread 19 (thread 4340.0xf04):
#0  0x76e564f4 in ntdll!LdrFindResourceEx_U () from C:\Windows\system32\ntdll.dll
#1  0x76e55e6c in ntdll!ZwWriteVirtualMemory () from C:\Windows\system32\ntdll.dll
#2  0x7504179c in WaitForSingleObjectEx () from C:\Windows\system32\KernelBase.dll
#3  0x000005c0 in ?? ()
#4  0x00000001 in ?? ()
#5  0x00000000 in ?? ()

Thread 18 (thread 4340.0x3c4):
#0  0x76e564f4 in ntdll!LdrFindResourceEx_U () from C:\Windows\system32\ntdll.dll
#1  0x76e55e4c in ntdll!ZwWriteRequestData () from C:\Windows\system32\ntdll.dll
#2  0x75046872 in KERNELBASE!GetProcessId () from C:\Windows\system32\KernelBase.dll
#3  0x00000001 in ?? ()
#4  0x068af914 in ?? ()
#5  0x00000001 in ?? ()
#6  0x00000000 in ?? ()

Thread 17 (thread 4340.0x880):
#0  0x76e564f4 in ntdll!LdrFindResourceEx_U () from C:\Windows\system32\ntdll.dll
#1  0x76e55e4c in ntdll!ZwWriteRequestData () from C:\Windows\system32\ntdll.dll
#2  0x75046872 in KERNELBASE!GetProcessId () from C:\Windows\system32\KernelBase.dll
#3  0x00000001 in ?? ()
#4  0x0665f758 in ?? ()
#5  0x00000001 in ?? ()
#6  0x00000001 in ?? ()
#7  0x00000000 in ?? ()

Thread 16 (thread 4340.0x165c):
#0  0x76e564f4 in ntdll!LdrFindResourceEx_U () from C:\Windows\system32\ntdll.dll
#1  0x76e55e4c in ntdll!ZwWriteRequestData () from C:\Windows\system32\ntdll.dll
#2  0x75046872 in KERNELBASE!GetProcessId () from C:\Windows\system32\KernelBase.dll
#3  0x00000001 in ?? ()
#4  0x05e2f5a8 in ?? ()
#5  0x00000001 in ?? ()
#6  0x00000000 in ?? ()

Thread 14 (thread 4340.0xb6c):
#0  0x76e564f4 in ntdll!LdrFindResourceEx_U () from C:\Windows\system32\ntdll.dll
#1  0x76e55e6c in ntdll!ZwWriteVirtualMemory () from C:\Windows\system32\ntdll.dll
#2  0x7504179c in WaitForSingleObjectEx () from C:\Windows\system32\KernelBase.dll
#3  0x00000580 in ?? ()
#4  0x00000001 in ?? ()
#5  0x063cfe08 in ?? ()
#6  0x737f53a6 in ?? ()
#7  0x5cea92e4 in ?? ()
#8  0x00000580 in ?? ()
#9  0x0000001e in ?? ()
#10 0x00000024 in ?? ()
#11 0x00000001 in ?? ()
#12 0x00000000 in ?? ()

Thread 13 (thread 4340.0xc74):
#0  0x76e564f4 in ntdll!LdrFindResourceEx_U () from C:\Windows\system32\ntdll.dll
#1  0x76e55e6c in ntdll!ZwWriteVirtualMemory () from C:\Windows\system32\ntdll.dll
#2  0x7504179c in WaitForSingleObjectEx () from C:\Windows\system32\KernelBase.dll
#3  0x00000548 in ?? ()
#4  0x00000001 in ?? ()
#5  0x00000000 in ?? ()

Thread 12 (thread 4340.0x778):
#0  0x76e564f4 in ntdll!LdrFindResourceEx_U () from C:\Windows\system32\ntdll.dll
#1  0x76e55e7c in ntdll!ZwYieldExecution () from C:\Windows\system32\ntdll.dll
#2  0x76e4067b in ntdll!RtlLargeIntegerShiftLeft () from C:\Windows\system32\ntdll.dll
#3  0x76511174 in KERNEL32!AcquireSRWLockExclusive () from C:\Windows\system32\kernel32.dll
#4  0x76e6b3f5 in ntdll!RtlInsertElementGenericTableAvl () from C:\Windows\system32\ntdll.dll
#5  0x76e6b3c8 in ntdll!RtlInsertElementGenericTableAvl () from C:\Windows\system32\ntdll.dll
#6  0x00000000 in ?? ()

Thread 10 (thread 4340.0x1620):
#0  0x76e564f4 in ntdll!LdrFindResourceEx_U () from C:\Windows\system32\ntdll.dll
#1  0x76e54c1c in ntdll!ZwDeleteValueKey () from C:\Windows\system32\ntdll.dll
#2  0x75041876 in SleepEx () from C:\Windows\system32\KernelBase.dll
#3  0x00000000 in ?? ()

Thread 9 (thread 4340.0x10cc):
#0  0x76e564f4 in ntdll!LdrFindResourceEx_U () from C:\Windows\system32\ntdll.dll
#1  0x76e55e7c in ntdll!ZwYieldExecution () from C:\Windows\system32\ntdll.dll
#2  0x76e4067b in ntdll!RtlLargeIntegerShiftLeft () from C:\Windows\system32\ntdll.dll
#3  0x76511174 in KERNEL32!AcquireSRWLockExclusive () from C:\Windows\system32\kernel32.dll
#4  0x76e6b3f5 in ntdll!RtlInsertElementGenericTableAvl () from C:\Windows\system32\ntdll.dll
#5  0x76e6b3c8 in ntdll!RtlInsertElementGenericTableAvl () from C:\Windows\system32\ntdll.dll
#6  0x00000000 in ?? ()

Thread 8 (thread 4340.0xac4):
#0  0x76e564f4 in ntdll!LdrFindResourceEx_U () from C:\Windows\system32\ntdll.dll
#1  0x76e55e7c in ntdll!ZwYieldExecution () from C:\Windows\system32\ntdll.dll
#2  0x76e4067b in ntdll!RtlLargeIntegerShiftLeft () from C:\Windows\system32\ntdll.dll
#3  0x76511174 in KERNEL32!AcquireSRWLockExclusive () from C:\Windows\system32\kernel32.dll
#4  0x76e6b3f5 in ntdll!RtlInsertElementGenericTableAvl () from C:\Windows\system32\ntdll.dll
#5  0x76e6b3c8 in ntdll!RtlInsertElementGenericTableAvl () from C:\Windows\system32\ntdll.dll
#6  0x00000000 in ?? ()

Thread 7 (thread 4340.0xe08):
#0  0x76e564f4 in ntdll!LdrFindResourceEx_U () from C:\Windows\system32\ntdll.dll
#1  0x76e55e4c in ntdll!ZwWriteRequestData () from C:\Windows\system32\ntdll.dll
#2  0x75046872 in KERNELBASE!GetProcessId () from C:\Windows\system32\KernelBase.dll
#3  0x00000001 in ?? ()
#4  0x057df9f0 in ?? ()
#5  0x00000001 in ?? ()
#6  0x00000000 in ?? ()

Thread 6 (thread 4340.0x7fc):
#0  0x76e564f4 in ntdll!LdrFindResourceEx_U () from C:\Windows\system32\ntdll.dll
#1  0x76e55e7c in ntdll!ZwYieldExecution () from C:\Windows\system32\ntdll.dll
#2  0x76e4067b in ntdll!RtlLargeIntegerShiftLeft () from C:\Windows\system32\ntdll.dll
#3  0x76511174 in KERNEL32!AcquireSRWLockExclusive () from C:\Windows\system32\kernel32.dll
#4  0x76e6b3f5 in ntdll!RtlInsertElementGenericTableAvl () from C:\Windows\system32\ntdll.dll
#5  0x76e6b3c8 in ntdll!RtlInsertElementGenericTableAvl () from C:\Windows\system32\ntdll.dll
#6  0x00000000 in ?? ()

Thread 5 (thread 4340.0x61c):
#0  0x76e564f4 in ntdll!LdrFindResourceEx_U () from C:\Windows\system32\ntdll.dll
#1  0x76e55e4c in ntdll!ZwWriteRequestData () from C:\Windows\system32\ntdll.dll
#2  0x76e3ef27 in ntdll!RtlIsValidIndexHandle () from C:\Windows\system32\ntdll.dll
#3  0x76511174 in KERNEL32!AcquireSRWLockExclusive () from C:\Windows\system32\kernel32.dll
#4  0x76e6b3f5 in ntdll!RtlInsertElementGenericTableAvl () from C:\Windows\system32\ntdll.dll
#5  0x76e6b3c8 in ntdll!RtlInsertElementGenericTableAvl () from C:\Windows\system32\ntdll.dll
#6  0x00000000 in ?? ()

Thread 4 (thread 4340.0x1794):
#0  0x76e564f4 in ntdll!LdrFindResourceEx_U () from C:\Windows\system32\ntdll.dll
#1  0x76e55e4c in ntdll!ZwWriteRequestData () from C:\Windows\system32\ntdll.dll
#2  0x75046872 in KERNELBASE!GetProcessId () from C:\Windows\system32\KernelBase.dll
#3  0x00000002 in ?? ()
#4  0x04e8f9e8 in ?? ()
#5  0x00000001 in ?? ()
#6  0x00000000 in ?? ()

Thread 2 (thread 4340.0x51c):
#0  0x76e564f4 in ntdll!LdrFindResourceEx_U () from C:\Windows\system32\ntdll.dll
#1  0x76e55e6c in ntdll!ZwWriteVirtualMemory () from C:\Windows\system32\ntdll.dll
#2  0x7504179c in WaitForSingleObjectEx () from C:\Windows\system32\KernelBase.dll
#3  0x00000218 in ?? ()
#4  0x00000000 in ?? ()

Thread 1 (thread 4340.0x17b4):
#0  0x1e0650bc in python27!PyObject_Call () from C:\Windows\system32\python27.dll
#1  0x69781232 in iTunesPluginMain (__pyx_v_message=1768843636, __pyx_v_msgInfo=0x13e680, __pyx_v_refCon=0x0)
    at pytunes.c:467
#2  0x5bc1d217 in iTunes!getPhaseStreamLibraryVersion () from C:\Program Files\iTunes\iTunes.dll
#3  0x696e6974 in ?? ()
#4  0x0013e680 in ?? ()
#5  0x00000000 in ?? ()
(gdb)

<小时/>

编辑[2012/02/13]

我刚刚有了这个想法为什么不在 C 中尝试一下？，所以我就这么做了。而且它也不起作用，iTunes 仍然崩溃。也许我应该将问题重命名为“如何将 Python 嵌入到 iTunes 中？” ..

编辑:纯C实现现在不会导致iTunes崩溃，但我不知道上次我做错了什么。

#include "iTunesAPI/iTunesAPI.h"
#include <Python.h>

__declspec(dllexport) OSStatus iTunesPluginMain(OSType              message,
                                                PluginMessageInfo*  msgInfo,
                                                void*               refCon) {
    Py_Initialize();
    PyObject* op = Py_BuildValue("i", 123);
    Py_Finalize();
    return unimpErr;
}

Answer 1

看到回溯后，我没有看到任何其他 python 调用。然后我的脑海中出现了一个想法:由于您正在尝试使用 Cython (Python) 制作 itunes 插件 (C)，因此 Python 解释器可能未初始化。您需要创建一个中间 C 文件来引导 python 解释器并在实际使用之前初始化 cython 模块:

在main.c中:

#include <Python.h>
#include "../iTunesAPI/iTunesAPI.h"
#include "pytunes.c"

__declspec(dllexport) OSStatus iTunesPluginMain( OSType             message,
                                                 PluginMessageInfo* msgInfo,
                                                 void*              refCon ) {
    Py_Initialize();
    PyEval_InitThreads();
    initpytunes();
    return PyTunes_main(message, msgInfo, refCon);
}

在你的 pytunes.pyx 中:

cdef extern from "../iTunesAPI/iTunesAPI.h":

    ctypedef int        OSType
    ctypedef int        OSStatus

    ctypedef struct PluginMessageInfo:
        pass

    int unimpErr

cdef public int PyTunes_main(   OSType               message,
                                PluginMessageInfo*   msgInfo,
                                void*                refCon ):
    object()
    return 0

现在，在调用 cython/c 函数之前，Python 解释器和 cython 扩展都将被安全初始化:)