[Python.NET] how to load and execute py file which consumes a thrid part C-based python extension in C# code

[brad at fie.us]

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" <lizy10b at 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" <lizy10b at 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
>> _________________________________________________
>> Python.NET mailing list - PythonDotNet at python.org
>> http://mail.python.org/mailman/listinfo/pythondotnet

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