Crash in python while run from U3 device

**Philippe C. Martin** · Nov 26 '05, 09:55 PM

Re: Crash in python while run from U3 device

Philippe C. Martin wrote:
[color=blue]
> Hi,
>
> I am currently porting some of my applications to U3 (www.u3.com) and I do
> get a crash in ...objects\fram eobject.c: PyFrameObject *back =
> tstate->frame.
>
> The point of the current test is to get a python function called on a U3
> device event. (U3 only work with Windows currently).
>
> My C stub callback does get called but crashes when it tries to call the
> python function.
>
>
>
> *************** ************
> This is the function that registers the callback (actual dll prototype in
> header):
> *************** ************
> static PyObject *s_callback=NUL L;
> /*************** *************** *************** *************** ******/
> /*************** *************** *************** *************** ******/
> /* HRESULT dapiRegisterCal lback ( HSESSION hSession ,wchar_t*
> pszConnectionSt ring ,DAPI_CALLBACK pCallBack,void* pEx ,HCALLBACK*
> hCallback) */
> /*************** *************** *************** *************** ******/
> /*************** *************** *************** *************** ******/
>
> static PyObject *Py_dapiRegiste rCallback(PyObj ect *p_self, PyObject
> *p_args)
> {
> HRESULT l_result;
> HSESSION l_hSession;
> wchar_t* l_pszConnection String;
> PyObject *l_tmp_cb;
> //PyObject cs;
> void* l_pEx;
> HCALLBACK l_hCallback;
>
> if
>[/color]
(!PyArg_ParseTu ple(p_args,"iuO i",&l_hSession, &l_pszConnectio nString,&l_tmp_ cb,&l_pEx)[color=blue]
> )
> {
> BAD_PARAM;
> return NULL;
> }
> //l_pszConnection String = PyObject_Unicod e(cs);
> Py_XINCREF(l_tm p_cb);
> Py_XDECREF(s_ca llback);
> s_callback=l_tm p_cb;
> l_result =
>[/color]
dapiRegisterCal lback(l_hSessio n,l_pszConnecti onString,Stub_C allback,l_pEx,& l_hCallback);[color=blue]
>
> CHECK_RESULT;
>
> return Py_BuildValue(" l",l_hCallback) ;
>
> }[/color]
PS: the crash is in PyFrame_New

Thanks,

Philippe

[color=blue]
>
> *************** *************** *********
> This is the stub callback that crashes:
> *************** *************** *********
> void _stdcall Stub_Callback(H DEVICE p_dev, DWORD p_event, void *p_pEx)
> {
> PyObject *l_result;
> PyObject *l_arg_list;
>
> l_arg_list = Py_BuildValue(" (iii)", p_dev,p_event,p _pEx);
> l_result = PyEval_CallObje ct(s_callback, l_arg_list); /*No crash
> if I
> comment this line*/
> Py_DECREF(l_arg _list);
> }
>
>
> *************** *************** ***********
> This is the python source
> *************** *************** ***********
> (cs, and s have a correct value ... I think )
> import u3
> def mf(a,b,c):
> print 'CB'
>
> h=u3.dapiRegist erCallback(s, cs, mf, 0)
>
>
>
>
> Any help _greatly_ appreciated.
>
> Regards,
>
> Philippe[/color]

**Philippe C. Martin** · Nov 27 '05, 05:35 AM

Re: Crash in python while run from U3 device

PS: I should add that the U3 device does not actually run Python, but copies
it to the PC and launches it: I'm almost certain this is a bug in my code.

Help please !

Regards,

Philippe

Philippe C. Martin wrote:
[color=blue]
> Hi,
>
> I am currently porting some of my applications to U3 (www.u3.com) and I do
> get a crash in ...objects\fram eobject.c: PyFrameObject *back =
> tstate->frame.
>
> The point of the current test is to get a python function called on a U3
> device event. (U3 only work with Windows currently).
>
> My C stub callback does get called but crashes when it tries to call the
> python function.
>
>
>
> *************** ************
> This is the function that registers the callback (actual dll prototype in
> header):
> *************** ************
> static PyObject *s_callback=NUL L;
> /*************** *************** *************** *************** ******/
> /*************** *************** *************** *************** ******/
> /* HRESULT dapiRegisterCal lback ( HSESSION hSession ,wchar_t*
> pszConnectionSt ring ,DAPI_CALLBACK pCallBack,void* pEx ,HCALLBACK*
> hCallback) */
> /*************** *************** *************** *************** ******/
> /*************** *************** *************** *************** ******/
>
> static PyObject *Py_dapiRegiste rCallback(PyObj ect *p_self, PyObject
> *p_args)
> {
> HRESULT l_result;
> HSESSION l_hSession;
> wchar_t* l_pszConnection String;
> PyObject *l_tmp_cb;
> //PyObject cs;
> void* l_pEx;
> HCALLBACK l_hCallback;
>
> if
>[/color]
(!PyArg_ParseTu ple(p_args,"iuO i",&l_hSession, &l_pszConnectio nString,&l_tmp_ cb,&l_pEx)[color=blue]
> )
> {
> BAD_PARAM;
> return NULL;
> }
> //l_pszConnection String = PyObject_Unicod e(cs);
> Py_XINCREF(l_tm p_cb);
> Py_XDECREF(s_ca llback);
> s_callback=l_tm p_cb;
> l_result =
>[/color]
dapiRegisterCal lback(l_hSessio n,l_pszConnecti onString,Stub_C allback,l_pEx,& l_hCallback);[color=blue]
>
> CHECK_RESULT;
>
> return Py_BuildValue(" l",l_hCallback) ;
>
> }
>
> *************** *************** *********
> This is the stub callback that crashes:
> *************** *************** *********
> void _stdcall Stub_Callback(H DEVICE p_dev, DWORD p_event, void *p_pEx)
> {
> PyObject *l_result;
> PyObject *l_arg_list;
>
> l_arg_list = Py_BuildValue(" (iii)", p_dev,p_event,p _pEx);
> l_result = PyEval_CallObje ct(s_callback, l_arg_list); /*No crash
> if I
> comment this line*/
> Py_DECREF(l_arg _list);
> }
>
>
> *************** *************** ***********
> This is the python source
> *************** *************** ***********
> (cs, and s have a correct value ... I think )
> import u3
> def mf(a,b,c):
> print 'CB'
>
> h=u3.dapiRegist erCallback(s, cs, mf, 0)
>
>
>
>
> Any help _greatly_ appreciated.
>
> Regards,
>
> Philippe[/color]

Crash in python while run from U3 device

Crash in python while run from U3 device

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