I am in fact using the 2nd 'flavour':
string modInvoke = String.Format("import {0}\nfrom {0}
import *\n", "autoexec");
var source =
engine.CreateScriptSourceFromString(modInvoke, SourceCodeKind.Statements);
CompiledCode cc = source.Compile();
cc.Execute(scope);
// And bind our public delegates
OnConnect = scope.GetVariable<Func<User,
bool>>("OnConnect");
OnDisconnect = scope.GetVariable<Func<User,
bool>>("OnDisconnect");
OnDataRecv = scope.GetVariable<Func<User, string,
bool>>("OnDataReceived");
OnPreLogin = scope.GetVariable<Func<User,
bool>>("OnPreLogin");
OnLogin = scope.GetVariable<Func<User, bool>>("OnLogin");
Func<string> test = new Func<string>(Test);
scope.SetVariable("x", 10);
scope.SetVariable("Test", test);
And in a later piece of code, I just call the OnConnect(newUser)
delegate(in my C# part). Perhaps interesting to know, the autoexec has
an import clientconn and from clientconn import *.
Is my assumption that should work correct or am I missing something?
Patrick
Dino Viehland wrote:
What about the code which is actually running the code that "def OnConnect"
lives in?
I would expect you have either:
engine.ExecuteFile(..., scope)
or:
code = engine.CreateScriptSource*(...)
cc = code.Compile()
cc.Execute(scope)
or
code = engine.CreateScriptSource*(...)
code.Execute(scope)
where scope in all of these would be the scope that you've populated with the value of
"x".
I suspect the 2nd one is the one you want so that you can run the same code
against multiple
scopes w/ different sets of bound variables based upon the current request.
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Patrick van der Willik
Sent: Monday, June 15, 2009 4:26 PM
To: Discussion of IronPython
Subject: Re: [IronPython] Embedding IronPython and calling python functions
from C#
The actual code that uses these variables from within a script looks
like this:
def OnConnect(user):
s = "The value of x: " + str(x)
user.Send(s, True)
user.Receiver = "user_username"
return True
And the complete exception is:
[ERROR] [16-6-2009 1:18:16] An error occured while attempting to accept
a new connection. Error: name 'x' is not defined
[ERROR] [16-6-2009 1:18:16] Stacktrace: at
IronPython.Runtime.PythonContext.MissingName(SymbolId name)
at Microsoft.Scripting.Runtime.ModuleGlobalWrapper.GetCachedValue()
at Microsoft.Scripting.Runtime.ModuleGlobalWrapper.get_CurrentValue()
at S$2.OnConnect$6(Object user)
at _stub_$17##8(Closure , CallSite , Object , User )
at Microsoft.Scripting.Actions.MatchCaller.Call2[T0,T1,TRet](Func`4
target, CallSite site, Object[] args)
at Microsoft.Scripting.Actions.CallSite`1.UpdateAndExecute(Object[] args)
at
Microsoft.Scripting.Actions.UpdateDelegates.Update2[T,T0,T1,TRet](CallSite
site, T0 arg0, T1 arg1)
at System.Boolean(User)(Object[] , User )
at TestProject.Users.ConnectionManager.AcceptNewConnnections() in
C:\Users\Patrick\Documents\Visual Studio
2008\Projects\test\TestProject\Users\ConnectionManager.cs
:line 108
Weird thing is: If I use GetVariable, it works fine. The call is done at
a later location in the program that where I do the SetVariable, but the
script scope hasn't ben changed in the meantime.
Patrick
Michael Foord wrote:
Patrick van der Willik wrote:
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.
Can you show the actual code that attempts to use them and the actual
exception message raised.
Michael
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:* [email protected]
[mailto:[email protected]] *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
<[email protected] <mailto:[email protected]>> 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
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