在iTunes的共享库中使用PyObject_Call()发生段错误
我正在尝试使用iTunes的开发工具包和Cython。DLL的入口点似乎可以正常工作，但一旦使用任何“真正的Python”，iTunes就会崩溃。
下面的代码编译得很好，插件DLL也被iTunes成功加载。
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
但是一旦添加了Python表达式，iTunes就会崩溃，比如：
# ...
cdef public OSStatus iTunesPluginMain( OSType message,
PluginMessageInfo* messageInfo,
void* refCon ):
object()
return unimpErr
你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)
编辑 [2012/02/12]
新的发现让我得到了gdb会话，下面是相关内容。我希望有人能告诉我该怎么解决这个问题。:)
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告诉我的信息：
Unhandled exception at 0x1e0650bc in iTunes.exe: 0xC0000005
Segmentation fault when reading at 0x00000004.
编辑 [2012/02/13]
以下是iTunes崩溃后执行(gdb) thread 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)
编辑 [2012/02/13]
我突然想到为什么不试试C语言呢？于是我试了，但也不行，iTunes还是崩溃。也许我应该把问题改成“如何将Python嵌入到iTunes中？”……
编辑: 纯C的实现现在不会导致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;
}
1 个回答
1
看完这个错误追踪信息，我没有看到其他的 Python 调用。然后我想到一个点：因为你是在用 Cython（Python 的一种扩展）做一个 iTunes 插件（C 语言），所以可能 Python 解释器还没有初始化。你需要先创建一个中间的 C 文件来启动 Python 解释器，并在真正使用之前初始化 Cython 模块：
在 main.c 文件中：
#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);
}
然后在你的 pytunes.pyx 文件中：
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
这样一来，Python 解释器和 Cython 扩展就会安全地初始化好，然后再调用 Cython/C 函数 :)