Thanks for your code, Bradley
I followed your sample, add the path first , then PythonEngine.ImportModule,
spending all the day in embeding the third part C-based library into my C#
code, but PythonEngine.ImportModule still return Null.
I wrote a simple test C dll (only one function returns a+1), and a wrapper py
file using the ctypes.
Then load the py file in C#, the PythonEngine.ImportModule does return a
non-null value, but when invoke the function is saids can not find the dll.
When I put the dll in the Python root dir (on my end is C:\Python262\) , the py
file runs smoothly. I try to add the path of the dll into sys.path, but does
not work, only putting it into the Python root dir works.
So I think the situation is: third part C-base python library (in my case,
rtree and psycopg2) uses more complex ctypes warpper, so maybe the python.net
is incomptible to it? or I still have some chance to make it work, maybe still
the sys.path problem?
Thanks
Zhiyu Li
2013-03-29
lizy10b
发件人： b...@fie.us
发送时间： 2013-03-29 06:03:32
收件人： lizy10b
抄送： pythondotnet
主题： Re: [Python.NET] how to load and execute py file which consumes a thrid
part C-based python extension in C# code
Sorry. One more.
When my code then executes those callbacks, back into Python, it does so this
way:
System.Console.WriteLine("Getting Projects");
List<libcontextutilsclient.ProjectContextSettings> ret = new
List<libcontextutilsclient.ProjectContextSettings>(); //the things I expect
python to give me back
System.Console.WriteLine("Getting lock");
IntPtr p = this.Pedestal.GetPythonLock();
System.Console.WriteLine("Got Lock");
if (this.ProjectsRequested != null)
{
foreach (libcontextutils.GetProjectSettingsDelegate del in
this.ProjectsRequested.GetInvocationList()) //looping through callbacks on
delegate
{
System.Console.WriteLine("Calling Project Delegate");
ret.AddRange(del(projectsType, this)); //doing the
callback, which is a python callback in truth.
}
}
else
{
System.Console.Error.WriteLine("No delegates registered to
ProjectsRequested Event.");
}
System.Console.WriteLine("Releasing lock");
this.Pedestal.ReleasePythonLock(p);
System.Console.WriteLine("Released Lock");
return ret;
On Mar 28, 2013, at 5:34 PM, "b...@fie.us" <b...@fie.us> wrote:
In my code I'm running:
Python.Runtime.PythonEngine.Initialize();
I also have these defined:
public void AddPythonPath(string path)
{
CheckInitPython();
IntPtr l = Python.Runtime.PythonEngine.AcquireLock();
Python.Runtime.PythonEngine.RunSimpleString("import sys");
Python.Runtime.PythonEngine.RunSimpleString("sys.path.append(\"" +
path.Replace("\\", "\\\\") + "\")");
Python.Runtime.PythonEngine.ReleaseLock(l);
}
public Python.Runtime.PyObject ImportModule(string name)
{
CheckInitPython();
IntPtr l = Python.Runtime.PythonEngine.AcquireLock();
Python.Runtime.PyObject module =
Python.Runtime.PythonEngine.ImportModule(name);
Python.Runtime.PythonEngine.ReleaseLock(l);
if (module == null)
{
throw new libscclient.PythonModuleNotCreatedException(name);
}
return module;
}
And when my code loads a "plugin" python module, it runs this:
string pythonVersionBasePath = GetPythonCodeBaseVersionPath(); //my
dynamic plugin code.
string scriptName = GetPythonScriptName(); //also my dynamic plugin
code.
System.Console.WriteLine("importing module");
Pedestal.AddPythonPath(pythonVersionBasePath); //calling code above
Python.Runtime.PyObject module =
Pedestal.ImportModule(scriptName.Split(new char[] { '.' }, 2)[0]); //calling
code above
System.Console.WriteLine("module imported");
IntPtr l = Pedestal.GetPythonLock();
module.InvokeMethod(GetPythonInitMethodName(), new
Python.Runtime.PyObject[] { Python.Runtime.PyObject.FromManagedObject(this) });
//calling a method by name. the name comes from my dynamic plugin code.
module.Dispose(); //I'm done with the module so I toss it. my code
here registers callbacks.
Pedestal.ReleasePythonLock(l);
On Mar 28, 2013, at 2:09 PM, "lizy10b" <lizy...@126.com> wrote:
Thank you, Bradley.
I found a simple sample code on the maillist. Now I could load and execute a
pure python function in a py file in C#.
And a new problem is that the PythonEngine.ImportModule("modulename") method
always return NULL in my case. The modulename.py comsumes a third part ctypes
wrapped library (the Rtree 0.7 python library). It seems the PythonEngine can
not find it, but actually it has been installed to the default path
(C:\Python262\Lib\site-packages\rtree) , and the modulename.py file runs
smoothly under python command line.
I worte a new py file which only contains a function returning the sys.path,
and load it in C#, the sys.path seems OK.
So I don't know what's wrong....
Thanks.
Zhiyu Li
2013-03-29
lizy10b
发件人： Bradley Friedman
发送时间： 2013-03-28 22:15:18
收件人： lizy10b
抄送： pythondotnet
主题： Re: [Python.NET] how to load and execute py file which consumes a thrid
part C-based python extension in C# code
What you are looking to do is "embed" a python interpreter in your .net
project, using pythonnet, and then tell the runtime to execute your python
script.
I have done this in one of my projects. It does work.
http://pythonnet.sourceforge.net/readme.html#embedding
Sent from my iPad
On Mar 28, 2013, at 8:31 AM, "lizy10b" <lizy...@126.com> wrote:
Hi there,
I am a freshman and new to python.net.
I have a *.py script which calls a third part python library, and the library
is a ctypes python wrapper of a C++ dll (or say C-based python extension?).
Frist I tried to make it using IronPython. IronPython works well when I load a
pure python *.py (no third part libraries) file and execute it in C# code.
But it failed when I load a *.py which comsumes a thrid part ctypes python
wrapper library mentioned above.
Then I turn to python.net. But I don't know how to load and execute *.py in C#
code using python.net.
Thanks.
Zhiyu Li
Student
China
2013-03-28
lizy10b
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