Mailman 3 April 2008 - Python.NET

Re: [Python.NET] Unbound methods from a .net assembly
by Shawn Edwards April 29, 2008

April 29, 2008

D'oh! I told you it was something stupid I was doing. Thanks for the kick in the head. On Mon, Apr 28, 2008 at 8:41 PM, Maksim Kozyarchuk < mkozyarchuk(a)funddevelopmentservices.com> wrote: > Shawn, > GetAvailableDevices is a method, you should be calling it. > > I.e. > for r in QuickCam.GetAvailableDevices(): print r > > Maksim > > > On 4/28/08 9:24 PM, "Shawn Edwards" <lesser.evil(a)gmail.com> wrote: > > I am trying to use the QuickCamLib library with Python.net. I looks like > I'm not getting the .net library loaded right, but I'm new to Python.net and > to .net in general, so I'm not sure I'm doing everything right. > > The quickcamlib is here: http://grazz.com/projects/quickcamlib > > Here's what I get on the shell: > > Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit > (Intel)] on win32 > Type "copyright", "credits" or "license()" for more information. > > **************************************************************** > Personal firewall software may warn about the connection IDLE > makes to its subprocess using this computer's internal loopback > interface. This connection is not visible on any external > interface and no data is sent to or received from the Internet. > **************************************************************** > > IDLE 1.2.2 > >>> import clr > >>> import QuickCamLib > >>> from QuickCamLib import QuickCam > >>> dir(QuickCam) > ['Capture', 'Dispose', 'Equals', 'Finalize', 'Focus', > 'GetAvailableDevices', 'GetAvailableResolutions', 'GetHashCode', 'GetType', > 'MemberwiseClone', 'Pan', 'ReferenceEquals', 'ResetPTZ', 'Tilt', 'ToString', > 'Zoom', '__call__', '__class__', '__cmp__', '__delattr__', '__delitem__', > '__doc__', '__getattribute__', '__getitem__', '__hash__', '__init__', > '__iter__', '__module__', '__new__', '__reduce__', '__reduce_ex__', > '__repr__', '__setattr__', '__setitem__', '__str__'] > >>> QuickCam.GetAvailableDevices > <unbound method 'GetAvailableDevices'> > >>> for r in QuickCam.GetAvailableDevices: print r > > > Traceback (most recent call last): > File "<pyshell#6>", line 1, in <module> > for r in QuickCam.GetAvailableDevices: print r > TypeError: 'MethodBinding' object is not iterable > >>> from System.Drawing import Point > >>> p = Point(5,5) > >>> print p > {X=5,Y=5} > >>> > > (the "Point" stuff is there to show that Python.net seems to work for some > objects, just not others) > > The 'unbound method' message is worrisome. Seems to me it should have > done something instead of just complain that it is unbound. Lazy binding > isn't usually this lazy :) > > I don't know enough about .net to really test this library any other way, > so it is also possible the library is dorked up somehow. > > If I need to send more/different data, please let me know. Like I said, > I'm new at a lot of this, so I'm likely missing something simple. > > Thanks in advance. > > > -- Shawn Edwards Beware programmers with screwdrivers. Or, for that matter, any other mixed drink.

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Unbound methods from a .net assembly
by Shawn Edwards April 29, 2008

April 29, 2008

I am trying to use the QuickCamLib library with Python.net. I looks like I'm not getting the .net library loaded right, but I'm new to Python.net and to .net in general, so I'm not sure I'm doing everything right. The quickcamlib is here: http://grazz.com/projects/quickcamlib Here's what I get on the shell: Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit (Intel)] on win32 Type "copyright", "credits" or "license()" for more information. **************************************************************** Personal firewall software may warn about the connection IDLE makes to its subprocess using this computer's internal loopback interface. This connection is not visible on any external interface and no data is sent to or received from the Internet. **************************************************************** IDLE 1.2.2 >>> import clr >>> import QuickCamLib >>> from QuickCamLib import QuickCam >>> dir(QuickCam) ['Capture', 'Dispose', 'Equals', 'Finalize', 'Focus', 'GetAvailableDevices', 'GetAvailableResolutions', 'GetHashCode', 'GetType', 'MemberwiseClone', 'Pan', 'ReferenceEquals', 'ResetPTZ', 'Tilt', 'ToString', 'Zoom', '__call__', '__class__', '__cmp__', '__delattr__', '__delitem__', '__doc__', '__getattribute__', '__getitem__', '__hash__', '__init__', '__iter__', '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__setitem__', '__str__'] >>> QuickCam.GetAvailableDevices <unbound method 'GetAvailableDevices'> >>> for r in QuickCam.GetAvailableDevices: print r Traceback (most recent call last): File "<pyshell#6>", line 1, in <module> for r in QuickCam.GetAvailableDevices: print r TypeError: 'MethodBinding' object is not iterable >>> from System.Drawing import Point >>> p = Point(5,5) >>> print p {X=5,Y=5} >>> (the "Point" stuff is there to show that Python.net seems to work for some objects, just not others) The 'unbound method' message is worrisome. Seems to me it should have done something instead of just complain that it is unbound. Lazy binding isn't usually this lazy :) I don't know enough about .net to really test this library any other way, so it is also possible the library is dorked up somehow. If I need to send more/different data, please let me know. Like I said, I'm new at a lot of this, so I'm likely missing something simple. Thanks in advance. -- Beware programmers with screwdrivers. Or, for that matter, any other mixed drink.

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problem with manifests
by Mark Tigges April 25, 2008

April 25, 2008

I'm evaluating pythonnet to see if I should switch from IronPython. So far I'm liking what I'm seeing. I have one question though. I have a managed c++ dll which uses a unmanaged dll which makes use of OpenMP. I have to embed a manifest in my managed c++ dll so that any .exe knows how to get vcomp.dll (the openmp implementation) from the SxS cache. (I really have no idea what all that bullcr*p means, just what I've gleaned from researching the issue - there's something special about OpenMP in this regard.) So the manifest in the managed c++ dll looks like this: <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0"> <dependency> <dependentAssembly> <assemblyIdentity type="win32" name="Microsoft.VC80.CRT" version="8.0.50608.0" processorArchitecture="x86" publicKeyToken="1fc8b3b9a1e18e3b"></assemblyIdentity> </dependentAssembly> </dependency> <dependency> <dependentAssembly> <assemblyIdentity type="win32" name="Microsoft.VC80.OpenMP" version="8.0.50608.0" processorArchitecture="x86" publicKeyToken="1fc8b3b9a1e18e3b"></assemblyIdentity> </dependentAssembly> </dependency> </assembly> The second dependency node tells any exe from where to load openmp. All except the python.exe in python.net, this is extraordinarily frustrating. Ultimately though I can work around it, I can embed the OpenMP dependency in python.exe myself, but I'd rather not have to do that. It should just work. Does anyone who understands all this bullcr*p have any insight into what more I need to do to my managed c++ dll to make it work? BTW: Fantastic work on this project, I'm very impressed. Thanks, Mark.

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converting Pyobject to user defined type data structures
by Kaveripakam, Sathish April 17, 2008

April 17, 2008

Hi All, I am reading a PyObject from Python in C#. In C# code, I would like to convert the PyObject to the user defined type. In this regard, I used the call: <usrDefinedType> x = (usrDefinedType) Convert.ChangeType(pyObjectInstance,typeof(usrDefinedType)); The compilation went on fine, but during runtime, I got an error saying: "Object must implement IConvertible". I was wondering, is there any other way to convert the PyObjects to userdefined types ? Regards ******************** Legal Notice: The information in this electronic transmission may contain confidential or legally privileged information and is intended solely for the individual(s) named above. If you are not an intended recipient or an authorized agent, you are hereby notified that reading, distributing, or otherwise disseminating, copying or taking any action based on the contents of this transmission is strictly prohibited. Any unauthorized interception of this transmission is illegal under law. If you have received this transmission in error, please notify the sender by telephone [at the number indicated above/ on +41 58 928 0101] as soon as possible and then destroy all copies of this transmission. ********************

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Re: [Python.NET] PythonDotNet Digest, Vol 53, Issue 3
by David Welden April 3, 2008

April 3, 2008

I picked this up from http://blog.jonudell.net/2007/09/04/sharepoint-ironpython-and-another-lesso…. I am trying to use the same code as in the example. Message: 2 > Date: Wed, 2 Apr 2008 21:40:17 -0400 > From: "Brian Lloyd" <brian.lloyd(a)revolutionhealth.com> > Subject: Re: [Python.NET] Dynamic Web Service Helpers > To: "David Welden" <dwoogle(a)gmail.com>, <pythondotnet(a)python.org> > Message-ID: > <1CCEDFD0D1FF43419A44DA69B60B996056C1A6(a)MI8NYCMAIL17.Mi8.com> > Content-Type: text/plain; charset="iso-8859-1" > > is DynamicWebServiceHelpers the right namespace? Sure its not > IronPython.DynamicWebServiceHelpers or something? > > The assembly name (AddReference) doesn't necessarily correspond > to the namespaces contained within... > > -Brian > > ________________________________ > > From: pythondotnet-bounces(a)python.org on behalf of David Welden > Sent: Wed 4/2/2008 4:56 PM > To: pythondotnet(a)python.org > Subject: [Python.NET] Dynamic Web Service Helpers > > > Has anyone successfully used the IronPython Dynamic Web Service Helpers ( > http://www.codeplex.com/IronPython/Release/ProjectReleases.aspx?ReleaseId=47) > assembly with Python.Net? Here is what I get: > > >>> import clr > >>> clr.FindAssembly("DynamicWebServiceHelpers") > u'DynamicWebServiceHelpers.dll' > >>> clr.AddReference("DynamicWebServiceHelpers") > <System.Reflection.Assembly object at 0x00B3D6F0> > >>> from DynamicWebServiceHelpers import * > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > ImportError: No module named DynamicWebServiceHelpers

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Dynamic Web Service Helpers
by David Welden April 3, 2008

April 3, 2008

Has anyone successfully used the IronPython Dynamic Web Service Helpers ( http://www.codeplex.com/IronPython/Release/ProjectReleases.aspx?ReleaseId=47) assembly with Python.Net? Here is what I get: >>> import clr >>> clr.FindAssembly("DynamicWebServiceHelpers") u'DynamicWebServiceHelpers.dll' >>> clr.AddReference("DynamicWebServiceHelpers") <System.Reflection.Assembly object at 0x00B3D6F0> >>> from DynamicWebServiceHelpers import * Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: No module named DynamicWebServiceHelpers

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Problem invoking a method
by Serge R April 1, 2008

April 1, 2008

Hello everyone. This is my first time using any mailing list, I hope I did everything right. My issue is that I can't call InvokeMethod on an imported module because it always claims the member does not exist. Further investigation suggests that my module isn't being imported correctly at all, but instead I'm getting some 'bank'. C# end: PyObject module = PythonEngine.ImportModule("test"); Console.WriteLine(module.Dir()); module.InvokeMethod("testFunction", new PyTuple()); test.py: def testFunction(): print "hello" when the Dir gets printed, I don't see any testFunction.

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Problems using Python.net in a TurboGears App on ubuntu/mono
by Ulrich Eck April 1, 2008

April 1, 2008

Hi all, i'm trying to use the C#-Library iTextSharp within a TurboGears Application. the most convenient way would be, to use pythonnet to access the needed methods of the c#-library. but .. i get a Segfault when trying to use clr imports: executed with: "mono python.exe start-netdemo.py" -------------------------- #!/usr/bin/python # -*- coding: utf-8 -*- """Start script for the netdemo TurboGears project. This script is only needed during development for running from the project directory. When the project is installed, easy_install will create a proper start script. """ import clr import System import sys from netdemo.commands import start, ConfigurationError if __name__ == "__main__": try: start() except ConfigurationError, exc: sys.stderr.write(str(exc)) sys.exit(1) --------------- the following traceback is produced - can anyone suggest, how to debug or find a solution - my expectation is, that there is some trouble with threading, but this is just guessing. pythonnet basically works, i can import from iTextSharp using the interpreter-cli. ----------------- root@wwdev:/data/develop/test/netdemo# mono python.exe start-netdemo.py Stacktrace: at (wrapper managed-to-native) Python.Runtime.Runtime.PyInt_FromLong (intptr) <0x00004> at (wrapper managed-to-native) Python.Runtime.Runtime.PyInt_FromLong (intptr) <0xffffffff> at Python.Runtime.Runtime.PyInt_FromInt32 (int) <0x0002f> at Python.Runtime.Runtime.Initialize () <0x00234> at Python.Runtime.PythonEngine.Initialize () <0x0002f> at (wrapper runtime-invoke) System.Object.runtime_invoke_void (object,intptr,intptr,intptr) <0xffffffff> Native stacktrace: /usr/lib/libmono.so.0 [0xb7b096c6] /usr/lib/libmono.so.0 [0xb7adbe96] [0xffffe440] [0xb6f69681] [0xb6f69630] [0xb71e267d] [0xb71dc790] [0xb71dc6f0] /usr/lib/libmono.so.0 [0xb7adbcc6] /usr/lib/libmono.so.0(mono_runtime_invoke+0x33) [0xb7b6f88e] /usr/lib/python2.5/site-packages/clr.so(main_thread_handler +0xc6) [0xb7cbde16] /usr/lib/python2.5/site-packages/clr.so(PyNet_Init+0x7f) [0xb7cbdf7f] /usr/lib/python2.5/site-packages/clr.so(initclr+0x76) [0xb7cbdc46] /usr/bin/python(_PyImport_LoadDynamicModule+0xa4) [0x80e1a34] /usr/bin/python [0x80df6d5] /usr/bin/python [0x80df98b] /usr/bin/python [0x80dfe3e] /usr/bin/python [0x80e0068] /usr/bin/python(PyImport_ImportModuleLevel+0x27) [0x80e04f7] /usr/bin/python [0x80c1db4] /usr/bin/python(PyObject_Call+0x27) [0x805c9e7] /usr/bin/python(PyEval_CallObjectWithKeywords+0x6c) [0x80c232c] /usr/bin/python(PyEval_EvalFrameEx+0x18bd) [0x80c4a9d] /usr/bin/python(PyEval_EvalCodeEx+0x775) [0x80ca115] /usr/bin/python(PyEval_EvalCode+0x57) [0x80ca187] /usr/bin/python(PyRun_FileExFlags+0xf8) [0x80e9698] /usr/bin/python(PyRun_SimpleFileExFlags+0x187) [0x80e9927] /usr/bin/python(Py_Main+0x9c0) [0x8059390] /usr/bin/python(main+0x22) [0x80588c2] /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe0) [0xb7d9f050] /usr/bin/python [0x8058831] Debug info from gdb: Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1". [Thread debugging using libthread_db enabled] [New Thread -1210545984 (LWP 8343)] [New Thread -1222792304 (LWP 8345)] [New Thread -1222710384 (LWP 8344)] 0xffffe410 in __kernel_vsyscall () 3 Thread -1222710384 (LWP 8344) 0xffffe410 in __kernel_vsyscall () 2 Thread -1222792304 (LWP 8345) 0xffffe410 in __kernel_vsyscall () 1 Thread -1210545984 (LWP 8343) 0xffffe410 in __kernel_vsyscall () Thread 3 (Thread -1222710384 (LWP 8344)): #0 0xffffe410 in __kernel_vsyscall () #1 0xb7f0d9f6 in ?? () from /lib/tls/i686/cmov/libpthread.so.0 #2 0xb7bec7db in ?? () from /usr/lib/libmono.so.0 #3 0xb71ee3cc in ?? () #4 0x00000000 in ?? () Thread 2 (Thread -1222792304 (LWP 8345)): #0 0xffffe410 in __kernel_vsyscall () #1 0xb7f0a676 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0 #2 0xb7bf191e in ?? () from /usr/lib/libmono.so.0 #3 0xb76c81dc in ?? () #4 0xb76c81c4 in ?? () #5 0xb7f08541 in pthread_mutex_lock () from /lib/tls/i686/cmov/ libpthread.so.0 #6 0xb7bf1c2b in ?? () from /usr/lib/libmono.so.0 #7 0xb76c81dc in ?? () #8 0xb76c81c4 in ?? () #9 0x00000000 in ?? () Thread 1 (Thread -1210545984 (LWP 8343)): #0 0xffffe410 in __kernel_vsyscall () #1 0xb7e552a1 in select () from /lib/tls/i686/cmov/libc.so.6 #2 0xb7a36780 in g_spawn_sync () from /usr/lib/libglib-2.0.so.0 #3 0xb7a36b4c in g_spawn_command_line_sync () from /usr/lib/ libglib-2.0.so.0 #4 0xb7b097ad in ?? () from /usr/lib/libmono.so.0 #5 0xb797f840 in ?? () #6 0xb797f828 in ?? () #7 0xb797f824 in ?? () #8 0xb797f820 in ?? () #9 0x00000000 in ?? () #0 0xffffe410 in __kernel_vsyscall () ================================================================= Got a SIGSEGV while executing native code. This usually indicates a fatal error in the mono runtime or one of the native libraries used by your application. ================================================================= 2008-04-01 15:10:11,740 cherrypy.msg INFO ENGINE: SystemExit raised: shutting down autoreloader 2008-04-01 15:10:11,741 cherrypy.msg INFO HTTP: HTTP Server shut down 2008-04-01 15:10:11,746 cherrypy.msg INFO ENGINE: CherryPy shut down ----------------- Do i need to do special things (like pythoncom->CoInitialize) when using pythonnet in a multithreaded environment ? thanks for all your hints - i'ld try to avoid using python and ironpython together with pyro ;-) or worse, code the itext-stuff in c# and call it from the cmd-line ;-) cheers Ulrich

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PythonHome property referencing Python folder
by Christopher Fraschetti April 1, 2008

April 1, 2008

Hello, I am attempting to package Python with a .Net application and would like to run the packaged version of python that I have using Python for .Net. In other words, python will not be officially installed on the client but will be reference with the .Net package. Is there a way to set PythonEngine to use a specific location for PythonHome. It seems obvious that the Python.Engine.PythonHome property (Read/Write property) could be written with the folder containing the Python folder I would like to use but when I try writing the property, initializing the engine and then read the PythonHome it says the property contains "-4z". Also... it does not work. After initialization I try to import a module and it returns a null value. Here is some code: PythonEngine.PythonHome = "c:\\Python25"; //Not officially installed. Just a folder containing a python implementation. PythonEngine.Initialize(); PyObject appModule = PythonEngine.ImportModule("app"); //app.py found in root folder of .Net application PyObject startApplication = appModule.GetAttr("startApplication"); PyObject app = startApplication.Invoke() This does work with an officially installed version of Python (barring the change in PythonHome) but does not work just putting the Python25 folder in the given location and referencing it with the PythonHome property. So, is this the correct use of the property? Is there any way to accomplish what I am attempting to do? Thanks in advance for any insight. Chris

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