[Python.NET] call python in Visual C# WinForm application

[Denis Akhiyarov]

You may have much faster response on GitHub issues instead of using this
mailing list:

https://github.com/pythonnet/pythonnet/issues/new

Sometimes it takes few days for messages to post on this mailing list!!!

Did you try suggestions for resolving LoaderLock from Stackoverflow?

http://stackoverflow.com/questions/12900192/loaderlock-was-detected-with-visual-studio-2012

The problem with first code snippet is that you have ".py" at the end of
module name.

Inside WinForms there maybe threading issues, but try above first.

Did you confirm that loading works without WinForms code?

Cheers,
Denis

On Oct 12, 2016 8:59 PM, "solospirit" <solospirit at sohu.com> wrote:

> sorry, i just send it again, since i do not see it at
> https://mail.python.org/pipermail/pythondotnet/, i guess it might be
> lost, thanks.
>
>
> ----- 原始邮件 -----
>
>
> *发件人：*solospirit<solospirit at sohu.com>
>
> *发送时间：*2016-10-11 22:18:27
>
> *收件人：*A list for users and developers of Python for .NET<
> pythondotnet at python.org>
>
> *主 题：*回复:Re: [Python.NET] call python in Visual C# WinForm application
>
> Thanks Denis.
>
>
> I tried the following code, it still does not work, the pModule is NULL.
>
>        //string scriptdir = @"C:\gitcode\neural-networks-
> and-deep-learning\src";
>
>         private void CallPython2(string scriptdir)
>
>         {
>
>             PythonEngine.Initialize();
>
>             IntPtr pythonLock = PythonEngine.AcquireLock();
>
>             PythonEngine.RunSimpleString("import sys\n");
>
>             PythonEngine.RunSimpleString("sys.path.append('" + scriptdir
> + "')\n");
>
>             PyObject pModule = PythonEngine.ImportModule("network2.py");
>
>         }
>
>
> I also tried the following code, there is exception, see below.
>
>        //string scriptdir = @"C:\gitcode\neural-networks-
> and-deep-learning\src";
>
>         private void CallPython3(string scriptdir)
>
>         {
>
>             using (Py.GIL())
>
>             {
>
>                 dynamic sys = Py.Import("sys");
>
>                 sys.path.append(scriptdir);
>
>                 dynamic testmodule = Py.Import("network2");
>
>
>                 //the following code works
>
>                 //dynamic np = Py.Import("numpy");
>
>                 //dynamic sin = np.sin;
>
>                 //double c = np.cos(5) + sin(5);
>
>                 //MessageBox.Show(c.ToString());
>
>             }
>
>         }
>
>
> Exception information:
>
> LoaderLock was detected
>
> Message: Attempting managed execution inside OS Loader lock. Do not
> attempt to run managed code inside a DllMain or image initialization
> function since doing so can cause the application to hang.
>
>
> Actually, my script is called when a button on winform is clicked, it is
> not called as the above exception message says.
>
>
>
> ----- 原始邮件 -----
>
>
> *发件人：*Denis Akhiyarov<denis.akhiyarov at gmail.com>
>
> *发送时间：*2016-09-27 01:54:22
>
> *收件人：*A list for users and developers of Python for .NET<
> pythondotnet at python.org>
>
> *主 题：*Re: [Python.NET] call python in Visual C# WinForm application
> @solospirit:
> You are doing illegal things with Python and believe me - it bites back :)
>
> Remember that in Python you cannot just import modules (.py) just from
> arbitrary paths, unless you are using importlib or sys.path.
>
> Hence here is the correct workflow using sys.path:
>
> *Microsoft (R) Roslyn C# Compiler version 1.2.0.60425*
> *Loading context from 'CSharpInteractive.rsp'.*
> *Type "#help" for more information.*
> *> #r "C:\Python\Python27_32b\Lib\site-packages\Python.Runtime.dll"*
> *> using Python.Runtime;*
> *> dynamic sys; using (Py.GIL()) { sys= Py.Import("sys"); }*
> *> using (Py.GIL()) {
> sys.path.append(@"C:\Users\denis.akhiyarov\Downloads") ;  }*
> *> dynamic testmodule; using (Py.GIL()) { testmodule =
> Py.Import("network2"); }*
> *> testmodule.Network*
> *[<class 'network2.Network'>]*
>
>
> Perhaps this should be documented here:
>
> https://github.com/pythonnet/pythonnet/wiki/pythonnet-
> troubleshooting-wiki-on-Windows
>
> Thanks,
> Denis
>
>
> On Mon, Sep 26, 2016 at 8:40 AM, solospirit  <  solospirit at sohu.com>
> wrote:
>
>
> Hi,
>
>
> I'm using windows 7 64bit + Visual C#2012 to develop WinForm 32bit
> application with .Net Framework 4.0. I want to call some python script
> within my winform application.
>
>
> After read the document, i'm now able to call the following code within my
> WinForm application, and the result is correct.
>
>             using (Py.GIL())
>
>             {
>
>                 dynamic np = Py.Import("numpy");
>
>                 dynamic sin = np.sin;
>
>                 double c = np.cos(5) + sin(5);
>
>                 MessageBox.Show(c.ToString());
>
>             }
>
>
> I'm using a python script from https://github.com/
> mnielsen/neural-networks-and-deep-learning/blob/master/src/network2.py
> <https://github.com/mnielsen/neural-networks-and-deep-learning/blob/master/src/network2.py,> by
> git clone to my local machine c:\mypath\neural-networks-and-deep-learning,
> it works inside python in my system.
>
>
> I tried the following code, but the np returns NULL.
>
>             using (Py.GIL())
>
>             {
>
>                 dynamic np = Py.Import(@"c:\mypath\neural-
> networks-and-deep-learning\src\network2");
>
>             }
>
>
> I also tried the following code, but pModule also returns NULL
>
>             string workingdir = @"c:\mypath\neural-networks-
> and-deep-learning\src";
>
>             PythonEngine.Initialize();
>
>             IntPtr pythonLock = PythonEngine.AcquireLock();
>
>             PythonEngine.RunSimpleString("import sys\n");
>
>             PythonEngine.RunSimpleString("sys.path.append('" + workingdir
> + "')\n");
>
>             PyObject pModule = PythonEngine.ImportModule(workingdir +
> "\\network2.py");
>
>
> How could I invoke such python script, thanks a lot!
>
>
>
>
>
>
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