From astaley at berkeley.edu  Fri Jul  4 08:14:41 2008
From: astaley at berkeley.edu (Aaron Staley)
Date: Thu, 03 Jul 2008 23:14:41 -0700
Subject: [capi-sig] importerror: no such file or directory when calling some
 functions in my C code
Message-ID: <486DBFD1.6010307@berkeley.edu>

I have been writing a python C++ extension that makes use of Intel's
open computer vision library.  I have been experiencing a bizarre problem.

When I attempt to run my module:
>>> import cvdemo
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No such file or directory


I have found though that this will only occur when my c++ actually makes
a call to opencv functions.  If I comment all of those functions out,
the module will be correctly imported (and I can execute all functions
within it).

Literally, everything works fine until a line like:

    cvDestroyWindow("result");

or:

cvNamedWindow( "result", 1 );

or:
matrix= cvLoad( matrix_name, 0, 0, 0 );


is in the code.


Given how lacking in information python's import error is, I have no
idea what is going on here. No compile errors are given either.

Please advise,
Aaron Staley




From astaley at berkeley.edu  Fri Jul  4 20:22:01 2008
From: astaley at berkeley.edu (Aaron Staley)
Date: Fri, 04 Jul 2008 11:22:01 -0700
Subject: [capi-sig] importerror: no such file or directory when calling some
 functions in my C code
Message-ID: <486E6A49.6030800@berkeley.edu>

I have been writing a python C++ extension that makes use of Intel's
open computer vision library.  I have been experiencing a bizarre problem.

When I attempt to run my module:
>>> import cvdemo
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No such file or directory


I have found though that this will only occur when my c++ actually makes
a call to opencv functions.  If I comment all of those functions out,
the module will be correctly imported (and I can execute all functions
within it).

Literally, everything works fine until a line like:

    cvDestroyWindow("result");

or:

cvNamedWindow( "result", 1 );

or:
matrix= cvLoad( matrix_name, 0, 0, 0 );


is in the code.


Given how lacking in information python's import error is, I have no
idea what is going on here. No compile errors are given either.

Please advise,
Aaron Staley





From astaley at berkeley.edu  Sat Jul  5 00:44:33 2008
From: astaley at berkeley.edu (Aaron Staley)
Date: Fri, 04 Jul 2008 15:44:33 -0700
Subject: [capi-sig] importerror: no such file or directory when calling some
 functions in my C code
Message-ID: <486EA7D1.8060603@berkeley.edu>

I have been writing a python C++ extension that makes use of Intel's
open computer vision library.  I have been experiencing a bizarre problem.

When I attempt to run my module:
>>> import cvdemo
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No such file or directory


I have found though that this will only occur when my c++ actually makes
a call to opencv functions.  If I comment all of those functions out,
the module will be correctly imported (and I can execute all functions
within it).

Literally, everything works fine until a line like:

    cvDestroyWindow("result");

or:

cvNamedWindow( "result", 1 );

or:
matrix= cvLoad( matrix_name, 0, 0, 0 );


is in the code.


Given how lacking in information python's import error is, I have no
idea what is going on here. No compile errors are given either.

Please advise,
Aaron Staley






From gjcarneiro at gmail.com  Sat Jul  5 00:52:14 2008
From: gjcarneiro at gmail.com (Gustavo Carneiro)
Date: Fri, 4 Jul 2008 23:52:14 +0100
Subject: [capi-sig] importerror: no such file or directory when calling
	some functions in my C code
In-Reply-To: <486EA7D1.8060603@berkeley.edu>
References: <486EA7D1.8060603@berkeley.edu>
Message-ID: <a467ca4f0807041552k3eeccb7cuf55c3b886ac04fe6@mail.gmail.com>

Try running with the program strace and analyze the output.  That often
helps.

2008/7/4 Aaron Staley <astaley at berkeley.edu>:

> I have been writing a python C++ extension that makes use of Intel's
> open computer vision library.  I have been experiencing a bizarre problem.
>
> When I attempt to run my module:
>
>> import cvdemo
>>>>
>>> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
> ImportError: No such file or directory
>
>
> I have found though that this will only occur when my c++ actually makes
> a call to opencv functions.  If I comment all of those functions out,
> the module will be correctly imported (and I can execute all functions
> within it).
>
> Literally, everything works fine until a line like:
>
>   cvDestroyWindow("result");
>
> or:
>
> cvNamedWindow( "result", 1 );
>
> or:
> matrix= cvLoad( matrix_name, 0, 0, 0 );
>
>
> is in the code.
>
>
> Given how lacking in information python's import error is, I have no
> idea what is going on here. No compile errors are given either.
>
> Please advise,
> Aaron Staley
>
>
>
>
>
> _______________________________________________
> capi-sig mailing list
> capi-sig at python.org
> http://mail.python.org/mailman/listinfo/capi-sig
>



-- 
Gustavo J. A. M. Carneiro
INESC Porto, Telecommunications and Multimedia Unit
"The universe is always one step beyond logic." -- Frank Herbert

From astaley at berkeley.edu  Sat Jul  5 03:42:29 2008
From: astaley at berkeley.edu (Aaron Staley)
Date: Fri, 04 Jul 2008 18:42:29 -0700
Subject: [capi-sig] importerror: no such file or directory when calling
 some functions in my C code
In-Reply-To: <a467ca4f0807041552k3eeccb7cuf55c3b886ac04fe6@mail.gmail.com>
References: <486EA7D1.8060603@berkeley.edu>
	<a467ca4f0807041552k3eeccb7cuf55c3b886ac04fe6@mail.gmail.com>
Message-ID: <486ED185.4060906@berkeley.edu>

Thanks for the advice.  After a few more hours of work, I solved the 
problem.

Some comments:
1) It would be nice if python gave more descriptive errors when dll's 
fail to load.  The traces were showing this error:
 1042  346460 [main] python 4240 seterrno_from_win_error: 
/ext/build/netrel/src/cygwin-1.5.25-15/winsup/cygwin/dlfcn.cc:103 
windows error 126
(DLL failed to load due to missing files)  
If just the system error code was printed out it would have helped a lot.

2) IE7 is a horrible program.  Apparently, it has dependences on a DLL 
that doesn't exist in windows XP.  See comments at 
http://techmale.com/2008/02/27/how-microsoft-caused-apache-php_mysqldll-to-failusing-vista-dwmapidll/

Gustavo Carneiro wrote:
> Try running with the program strace and analyze the output.  That 
> often helps.
>
> 2008/7/4 Aaron Staley <astaley at berkeley.edu 
> <mailto:astaley at berkeley.edu>>:
>
>     I have been writing a python C++ extension that makes use of Intel's
>     open computer vision library.  I have been experiencing a bizarre
>     problem.
>
>     When I attempt to run my module:
>
>                 import cvdemo
>
>     Traceback (most recent call last):
>      File "<stdin>", line 1, in <module>
>     ImportError: No such file or directory
>
>
>     I have found though that this will only occur when my c++ actually
>     makes
>     a call to opencv functions.  If I comment all of those functions out,
>     the module will be correctly imported (and I can execute all functions
>     within it).
>
>     Literally, everything works fine until a line like:
>
>       cvDestroyWindow("result");
>
>     or:
>
>     cvNamedWindow( "result", 1 );
>
>     or:
>     matrix= cvLoad( matrix_name, 0, 0, 0 );
>
>
>     is in the code.
>
>
>     Given how lacking in information python's import error is, I have no
>     idea what is going on here. No compile errors are given either.
>
>     Please advise,
>     Aaron Staley
>
>
>
>
>
>     _______________________________________________
>     capi-sig mailing list
>     capi-sig at python.org <mailto:capi-sig at python.org>
>     http://mail.python.org/mailman/listinfo/capi-sig
>
>
>
>
> -- 
> Gustavo J. A. M. Carneiro
> INESC Porto, Telecommunications and Multimedia Unit
> "The universe is always one step beyond logic." -- Frank Herbert 


From ideasman42 at gmail.com  Wed Jul 16 16:23:18 2008
From: ideasman42 at gmail.com (Campbell Barton)
Date: Wed, 16 Jul 2008 16:23:18 +0200
Subject: [capi-sig] Python File+Line from GDB?
Message-ID: <7c1ab96d0807160723n72431caak1bee345f5e862a51@mail.gmail.com>

Every so often I get a crash in C/C++ code cause by some function python calls.
The problem is I want to know what line number+file python called
before the crash, at the moment I just do this with print's, but this
is tedious.

Annoyingly this crash happens when the python stack is being printed
but there have been other situations when I have been debugging and
wanted to know the python line number+file and where there was no
python error,
Any hints?

---- Here is the backtrace - at #20 or #21 the info might be available.
(gdb) bt
#0  0x0000000000825962 in SND_Scene::DeleteObject (this=0x18032450,
pObject=0x15624320) at intern/SoundSystem/intern/SND_Scene.cpp:498
#1  0x0000000000dcd3c7 in ~KX_SoundActuator (this=0x1dc45270) at
source/gameengine/Ketsji/KX_SoundActuator.cpp:76
#2  0x0000000000e704e2 in CValue::Release (this=0x1dc45270) at
source/gameengine/Expressions/Value.cpp:584
#3  0x0000000000e46763 in ~SCA_IObject (this=0x18b9f940) at
source/gameengine/GameLogic/SCA_IObject.cpp:71
#4  0x0000000000de9408 in ~KX_GameObject (this=0x18b9f940) at
source/gameengine/Ketsji/KX_GameObject.cpp:124
#5  0x0000000000d8cffa in ~BL_DeformableGameObject (this=0x18b9f940)
at source/gameengine/Converter/BL_DeformableGameObject.cpp:42
#6  0x0000000000e704e2 in CValue::Release (this=0x18b9f940) at
source/gameengine/Expressions/Value.cpp:584
#7  0x0000000000d981eb in CValue::SpecialRelease (this=0x18b9f940) at
source/gameengine/Expressions/Value.h:239
#8  0x0000000000d9821f in CValue::PyDestructor (P=0x18b9f948) at
source/gameengine/Expressions/Value.h:243
#9  0x0000000000f6da29 in _Py_Dealloc (op=0x18b9f948) at Objects/object.c:1933
#10 0x000000000102f08d in frame_dealloc (f=0x15b361c0) at
Objects/frameobject.c:416
#11 0x0000000000f6da29 in _Py_Dealloc (op=0x15b361c0) at Objects/object.c:1933
#12 0x0000000000ffa421 in tb_dealloc (tb=0x5dff240) at Python/traceback.c:34
#13 0x0000000000f6da29 in _Py_Dealloc (op=0x5dff240) at Objects/object.c:1933
#14 0x0000000000ffa3a8 in tb_dealloc (tb=0x5dff1c8) at Python/traceback.c:33
#15 0x0000000000f6da29 in _Py_Dealloc (op=0x5dff1c8) at Objects/object.c:1933
#16 0x0000000000f62706 in insertdict (mp=0x1754230, key=0x5dd3790,
hash=5897959712516987849, value=0x5dff0d8) at Objects/dictobject.c:416
#17 0x0000000000f62fd5 in PyDict_SetItem (op=0x1754230, key=0x5dd3790,
value=0x5dff0d8) at Objects/dictobject.c:641
#18 0x0000000000f6739f in PyDict_SetItemString (v=0x1754230,
key=0x11331de "last_traceback", item=0x5dff0d8) at
Objects/dictobject.c:2182
#19 0x0000000000ff7897 in PySys_SetObject (name=0x11331de
"last_traceback", v=0x5dff0d8) at Python/sysmodule.c:82
#20 0x0000000000ff011a in PyErr_PrintEx (set_sys_last_vars=1) at
Python/pythonrun.c:1076
#21 0x0000000000fefdcf in PyErr_Print () at Python/pythonrun.c:978
#22 0x0000000000e25d88 in SCA_PythonController::Trigger
(this=0x10d6b350, logicmgr=0x126e4660) at
source/gameengine/GameLogic/SCA_PythonController.cpp:309
#23 0x0000000000e3b69a in SCA_LogicManager::BeginFrame
(this=0x126e4660, curtime=18.244133488337447,
fixedtime=0.016666666666666666) at
source/gameengine/GameLogic/SCA_LogicManager.cpp:257
#24 0x0000000000dc08f4 in KX_Scene::LogicBeginFrame (this=0x1e5afca0,
curtime=18.244133488337447) at
source/gameengine/Ketsji/KX_Scene.cpp:1311
#25 0x0000000000e155e5 in KX_KetsjiEngine::NextFrame (this=0x183f6ed0)
at source/gameengine/Ketsji/KX_KetsjiEngine.cpp:440
#26 0x0000000000d5ccc9 in StartKetsjiShell (area=0xb0087d0,
scenename=0x10d4fe72 "frank_test", maggie1=0x15a56390,
sipo=0x1dc8c790, always_use_expand_framing=1)
    at source/gameengine/BlenderRoutines/BL_KetsjiEmbedStart.cpp:376
#27 0x0000000000628319 in start_game () at source/blender/src/space.c:543
#28 0x000000000062e852 in winqreadview3dspace (sa=0xb0087d0,
spacedata=0x1fb5f2f0, evt=0x7fffbf19e150) at
source/blender/src/space.c:2464
#29 0x0000000000683170 in scrarea_do_winhandle (area=0xb0087d0,
evt=0x7fffbf19e150) at source/blender/src/spacetypes.c:156
#30 0x00000000006d8244 in scrarea_dispatch_events (sa=0xb0087d0) at
source/blender/src/editscreen.c:598
#31 0x00000000006d9c00 in screen_dispatch_events () at
source/blender/src/editscreen.c:1224
#32 0x00000000006da67a in screenmain () at source/blender/src/editscreen.c:1508
#33 0x00000000004f45ae in main (argc=6, argv=0x7fffbf19e5a8) at
source/creator/creator.c:820

From rhamph at gmail.com  Wed Jul 16 18:32:09 2008
From: rhamph at gmail.com (Adam Olsen)
Date: Wed, 16 Jul 2008 10:32:09 -0600
Subject: [capi-sig] Python File+Line from GDB?
In-Reply-To: <7c1ab96d0807160723n72431caak1bee345f5e862a51@mail.gmail.com>
References: <7c1ab96d0807160723n72431caak1bee345f5e862a51@mail.gmail.com>
Message-ID: <aac2c7cb0807160932m5215cad0s5cb79b9206333e37@mail.gmail.com>

On Wed, Jul 16, 2008 at 8:23 AM, Campbell Barton <ideasman42 at gmail.com> wrote:
> Every so often I get a crash in C/C++ code cause by some function python calls.
> The problem is I want to know what line number+file python called
> before the crash, at the moment I just do this with print's, but this
> is tedious.
>
> Annoyingly this crash happens when the python stack is being printed
> but there have been other situations when I have been debugging and
> wanted to know the python line number+file and where there was no
> python error,
> Any hints?

Misc/gdbinit, pystack command


-- 
Adam Olsen, aka Rhamphoryncus

From franco.dirosa at baesystems.com  Fri Jul 18 19:54:18 2008
From: franco.dirosa at baesystems.com (DiRosa, Franco (US SSA))
Date: Fri, 18 Jul 2008 13:54:18 -0400
Subject: [capi-sig] How do you create a Python class and its instance using
	only the Python C/API...
Message-ID: <76562E5779762B438648F90E9D28ED5610FA7E1A@blums0013.cs.na.baesystems.com>

I've embedded Python into a C++ application under the Windows operating
system.  It uses Python as the scripting language to extend the Windows
Application thus making it more configurable.  Everything works great
but I want the stderr to be redirected to a window I have up in my
windows app.  I noticed by stepping thru the Python code that there is a
case where it looks for a "write" attribute object which if found will
pass the text to (PyFile_WriteObject).  That would work great but I need
to create this object that exposes this "write" attribute from within my
windows application code in C++ thus I need to use the Python C/API to
do it.  Any help on how to basically write a python class with a "write"
function in it using nothing only but the Python C/API would be greatly
appreciated.

 

Thank you,

 

Franco.

 

 


From gjcarneiro at gmail.com  Sun Jul 27 19:56:37 2008
From: gjcarneiro at gmail.com (Gustavo Carneiro)
Date: Sun, 27 Jul 2008 18:56:37 +0100
Subject: [capi-sig] Announce: PyBindGen 0.9 released
Message-ID: <a467ca4f0807271056j509beb4ey8c38102e61247e5a@mail.gmail.com>

PyBindGen is a Python module that is geared to generating C/C++ code that
binds a C/C++ library for Python. It does so without extensive use of either
C++ templates or C pre-processor macros. It has modular handling of C/C++
types, and can be easily extended with Python plugins. The generated code is
almost as clean as what a human programmer would write.

It can be downloaded from:

        http://code.google.com/p/pybindgen/

Bug reports should be filed here:

        https://bugs.launchpad.net/pybindgen


Special thanks to Roman Yakovenko (lots of help with pygccxml) and Mathieu
Lacage (API suggestions, documentation writing).


=== pybindgen 0.9 ===
    - Fix GCC 4.2 compilation warnings;
    - Works with some GCCXML 0.9/cvs snapshots (tested with 2008-04-20),
      in addition to stable 0.7;
    - Support for overloaded virtual methods;
    - Add 'ignore' annotation support, allowing to ignore functions
      and methods;
    - Generally work hard to make sure the generated code at least
      always compiles, even if we have to disable generation of
      certain wrappers;
    - Add support for protected methods and constructors;
    - Preliminary support for templated classes/methods/functions;
    - Add more type conversions, such as uint64_t and uint16_t;
    - Support implicit conversions also for pass-by-reference parameters;
    - Add supported for nested (i.e. defined inside a class) enums and
classes;
    - Add support for adding manually written custom method or function
wrappers;
    - Split the gccxmlparser.ModuleParser.parse() method into several
      smaller methods, to allow greater customization and flexibility;
    - Add support for customising C++ class instance creation code;
    - Much improved support for wrapping pure C code;
    - Support std::ostream << myobject mapped as str(myobject) (Mathieu
Lacage)
    - Support default values in parameters;
    - More intuitive API (thanks Mathieu Lacage for feedback)
    - Support generation of a Python pybindgen script from scanned API;
    - Support splitting of generated python script and/or C/C++ module into
several files;
    - Lots of small bug fixes, and other features I probably forgot;
    - New tutorial (thanks Mathieu Lacage), and API docs.

-- 
Gustavo J. A. M. Carneiro
INESC Porto, Telecommunications and Multimedia Unit
"The universe is always one step beyond logic." -- Frank Herbert