[IronPython] Embedding IronPython and calling python functions from C#
Patrick van der Willik
patrick at toolmaker.nl
Tue Jun 16 01:09:51 CEST 2009
Alright, that actually really worked pretty good, and I finally got it
all working as it should. However, I'm running into 1 more little issue,
now I need to go the other way around aswell. I have several functions
marked in my application as PythonExportable. In a certain startup phase
of the application, after creating the IronPython hosting environment, I
walk over all these classes using Reflection, take the tagged functions
and put these into my IP scope.
However, my simple tests for some reason cause my SetVariable() calls to
not work. I added 2 tests to my scripts, one where I add a variable into
the scope and another one where I add a delegate. However, in both
cases, whenever I use these variables from within my scripts, they don't
seem to work. Code:
Func<string> test = new Func<string>(Test);
scope.SetVariable("x", 10);
scope.SetVariable("Test", test);
Accessing them in my scripts have the effect of triggering an exception
that shows that x is undefined.
Some insights into this would be of great help.
Patrick
Michael Foord wrote:
> See this section of my hosting article:
>
> http://www.voidspace.org.uk/ironpython/hosting_api.shtml#functions-as-delegates
>
>
> You cast the function to a delegate as you fetch it out of the scope.
>
> Michael
>
> Patrick van der Willik wrote:
>> I'm a bit late with responding to this as I was kinda busy. I used
>> the code that was given Stephen and it seems to run properly without
>> throwing exceptions. However, I created a little autoexec.py file
>> with a simple function in it with 2 parameters.
>>
>> The main problem here is: How do I call the function through the
>> scope? I used engine.CreateScope() to create myself a new scope, but
>> from there on, I'm basically lost(again). What I basically want to
>> do, is call my function 'add' with 2 parameters(say, 10 and 15). The
>> modules itself are loaded into a ScriptSource.
>>
>> Thanks,
>> Patrick
>>
>> Lepisto, Stephen P wrote:
>>>
>>> What I do when I want to work with python modules from embedded
>>> IronPython is set the IronPython search path with the path of the
>>> module to load then create and execute a small python script that
>>> loads the main python modules into the current scope.
>>>
>>>
>>>
>>> string moduleName = Path.GetFileName(modulePath);
>>>
>>> string path = Path.GetDirectoryName(modulePath);
>>>
>>>
>>>
>>> ICollection<string> paths = _pythonEngine.GetSearchPaths();
>>>
>>> if (!paths.Contains(path))
>>>
>>> {
>>>
>>> paths.Add(path);
>>>
>>> _pythonEngine.SetSearchPaths(paths);
>>>
>>> }
>>>
>>> string modInvoke = String.Format("import {0}\nfrom {0} import *\n",
>>> moduleName);
>>>
>>> ScriptSource source =
>>> _pythonEngine.CreateScriptSourceFromString(modInvoke,
>>>
>>>
>>> Microsoft.Scripting.SourceCodeKind.Statements);
>>>
>>>
>>>
>>> Where modulePath is the full path to the python module or package to
>>> load.
>>>
>>>
>>>
>>> I can then invoke methods or access attributes using the IronPython
>>> scope. In this way, I can interact with the python modules for as
>>> long as necessary before closing down the scope/engine.
>>>
>>>
>>>
>>>
>>>
>>> *From:* users-bounces at lists.ironpython.com
>>> [mailto:users-bounces at lists.ironpython.com] *On Behalf Of *Dody
>>> Gunawinata
>>> *Sent:* Thursday, June 11, 2009 9:09 AM
>>> *To:* Discussion of IronPython
>>> *Subject:* Re: [IronPython] Embedding IronPython and calling python
>>> functions from C#
>>>
>>>
>>>
>>> You can read all yours file scripts, then using StringBuilder to
>>> combine then and call CreateScriptSourceFromString()
>>>
>>> Then you can call your functions within the combined scripts
>>> normally. Pretty much you are creating a giant source code on the fly.
>>>
>>>
>>>
>>> On Thu, Jun 11, 2009 at 5:32 PM, Patrick van der Willik
>>> <patrick at toolmaker.nl <mailto:patrick at toolmaker.nl>> wrote:
>>>
>>> I'm currently attempting to embed the IronPython 2 runtimes into an
>>> existing application written in C#. However, I find the amount of
>>> documentation lacking on what I'm trying to do. I currently have a
>>> proof-of-concept version which uses Lua and LuaInterface, but the
>>> people who have to write the scripts dislike Lua(Well, more hate it
>>> with a passion) and would love to see this working with Python.
>>>
>>> My host application is a networked application that must trigger
>>> certain scripts functions on events generated by the connected
>>> clients. The idea is that when my application starts, it will load
>>> the IronPython script environment, launches an 'autoexec.py' which
>>> will load various other scripts files and do some housekeeping. Once
>>> this all is completed, it will start listening to incoming
>>> connections. However, in various scenarios, the application has to
>>> trigger scripted functions when data is received from a client.
>>> Which script function is called is different per client and per
>>> event. I have events for connecting, logging on, disconnecting and a
>>> set of data specific events after receiving data. This highly
>>> depends on the received packets.
>>>
>>> My question here is: How do I embed IronPython in such a fashion
>>> that I can load my scripts and then trigger various functions within
>>> that? I've seen many examples that just call
>>> CreateScriptSourceFromString() or File each time in which just 1
>>> piece of code is implemented. This is not suitable for the needs
>>> here because the scripted systems can become quite complex.
>>>
>>> With regards,
>>> Patrick
>>>
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at lists.ironpython.com <mailto:Users at lists.ironpython.com>
>>> http://lists.ironpython.com/listinfo.cgi/users-ironpython.com
>>>
>>>
>>>
>>>
>>> --
>>> nomadlife.org <http://nomadlife.org>
>>>
>>> ------------------------------------------------------------------------
>>>
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at lists.ironpython.com
>>> http://lists.ironpython.com/listinfo.cgi/users-ironpython.com
>>>
>>
>> ------------------------------------------------------------------------
>>
>> _______________________________________________
>> Users mailing list
>> Users at lists.ironpython.com
>> http://lists.ironpython.com/listinfo.cgi/users-ironpython.com
>>
>
>
More information about the Ironpython-users
mailing list