PyTables working with python not working with python.net

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PyTables working with python not working with python.net

Guillaume Pichard
Hello,

I am trying to use pytables with python.net. It is working great with python alone. What I am doing with python.net is:
            PythonEngine.Initialize();
            PythonEngine.AcquireLock();

            PyObject sys = PythonEngine.ImportModule("sys");
            PyObject path = sys.GetAttr("path");
            PyObject append = path.GetAttr("append");
            PyObject[] a = new PyObject[1];
            a[0] = new PyString("C:\\Python27\\Lib\\site-packages");
            append.Invoke(a);

            PyObject pyTables = PythonEngine.ImportModule("tables");
            if (pyTables == null)
                throw new PythonException();

The exception message is "ImportError : DLL load failed: Specified module not found."

What could be the differences between python.net and python ? Is there any specific path to add ?

Thanks a lot,
Guillaume.


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Re: PyTables working with python not working with python.net

Tanmoy-2
python is written in pure C/C++. The point is to integrate C# codes in python.net. do go thru the list and u will be able to find ur answer.

T

On Sat, Mar 26, 2011 at 1:44 AM, Guillaume Pichard <[hidden email]> wrote:
Hello,

I am trying to use pytables with python.net. It is working great with python alone. What I am doing with python.net is:
            PythonEngine.Initialize();
            PythonEngine.AcquireLock();

            PyObject sys = PythonEngine.ImportModule("sys");
            PyObject path = sys.GetAttr("path");
            PyObject append = path.GetAttr("append");
            PyObject[] a = new PyObject[1];
            a[0] = new PyString("C:\\Python27\\Lib\\site-packages");
            append.Invoke(a);

            PyObject pyTables = PythonEngine.ImportModule("tables");
            if (pyTables == null)
                throw new PythonException();

The exception message is "ImportError : DLL load failed: Specified module not found."

What could be the differences between python.net and python ? Is there any specific path to add ?

Thanks a lot,
Guillaume.


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--
Tanmoy Mukherjee

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Re: PyTables working with python not working with python.net

Barton

I do believe (although I'm not an embedder myself) that this is the ol'
"Can't use unicode strings on import statements" thing...
This is the reason for a new class called PyAnsiString().

You'll have to have a fairly recent version to see if that fixes things
for you.
HTH,
Barton
On 03/27/2011 07:31 AM, Tanmoy wrote:

> python is written in pure C/C++. The point is to integrate C# codes in
> python.net <http://python.net>. do go thru the list and u will be able
> to find ur answer.
>
> T
>
> On Sat, Mar 26, 2011 at 1:44 AM, Guillaume Pichard
> <[hidden email] <mailto:[hidden email]>> wrote:
>
>     Hello,
>
>     I am trying to use pytables with python.net <http://python.net>.
>     It is working great with python alone. What I am doing with
>     python.net <http://python.net> is:
>                 PythonEngine.Initialize();
>                 PythonEngine.AcquireLock();
>
>                 PyObject sys = PythonEngine.ImportModule("sys");
>                 PyObject path = sys.GetAttr("path");
>                 PyObject append = path.GetAttr("append");
>                 PyObject[] a = new PyObject[1];
>                 a[0] = new PyString("C:\\Python27\\Lib\\site-packages");
>                 append.Invoke(a);
>
>                 PyObject pyTables = PythonEngine.ImportModule("tables");
>                 if (pyTables == null)
>                     throw new PythonException();
>
>     The exception message is "ImportError : DLL load failed: Specified
>     module not found."
>
>     What could be the differences between python.net
>     <http://python.net> and python ? Is there any specific path to add ?
>
>     Thanks a lot,
>     Guillaume.
>
>
>     _________________________________________________
>     Python.NET mailing list - [hidden email]
>     <mailto:[hidden email]>
>     http://mail.python.org/mailman/listinfo/pythondotnet
>
>
>
>
> --
> Tanmoy Mukherjee
>
>
> _________________________________________________
> Python.NET mailing list - [hidden email]
> http://mail.python.org/mailman/listinfo/pythondotnet
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Re: PyTables working with python not working with python.net

Barton
In reply to this post by Guillaume Pichard
Being a novice embedder (especially back when I wrote the pyimport.cs
module in the Python.EmbeddingTest project), I chose to do things a
little differently:
At the time, I felt like I wanted access to the entire engine.
I still can't decide if calling methods on PyObject is more clumsy than
the object[] arg passing arrangement with strongly typed object or not.

   [SetUp]
   public void SetUp() {
     PythonEngine.Initialize();
     gs = PythonEngine.AcquireLock();

     //string here = Environment.CurrentDirectory;
     // trunk\pythonnet\src\embed_tests\bin\Debug

     /*
      * Append the tests directory to sys.path
      * using reflection to circumvent the private modifiers placed on
most Runtime methods.
      */
     string s = @"..\..\..\tests";

     Type RTClass = typeof(Runtime.Runtime);

     /* pyStrPtr = PyString_FromString(s); */
     MethodInfo PyString_FromString =
RTClass.GetMethod("PyString_FromString", BindingFlags.NonPublic |
BindingFlags.Static);
     object[] funcArgs = new object[1];
     funcArgs[0] = s;
     IntPtr pyStrPtr = (IntPtr)PyString_FromString.Invoke(null, funcArgs);

     /* SysDotPath = sys.path */
     MethodInfo PySys_GetObject = RTClass.GetMethod("PySys_GetObject",
BindingFlags.NonPublic | BindingFlags.Static);
     funcArgs[0] = "path";
     IntPtr SysDotPath = (IntPtr)PySys_GetObject.Invoke(null, funcArgs);

     /* SysDotPath.append(*pyStrPtr) */
     MethodInfo PyList_Append = RTClass.GetMethod("PyList_Append",
BindingFlags.NonPublic | BindingFlags.Static);
     funcArgs = new object[2];
     funcArgs[0] = SysDotPath;
     funcArgs[1] = pyStrPtr;
     int r = (int)PyList_Append.Invoke(null, funcArgs);
  }
     [TearDown]
     public void TearDown()
     {
         PythonEngine.ReleaseLock(gs);
         PythonEngine.Shutdown();
     }
    [Test]
    public void TestDottedName() {
        PyObject module;
        module = PythonEngine.ImportModule("PyImportTest.test.one");
        Assert.IsNotNull(module, ">>>  import PyImportTest.test.one  #
FAILED");
    }

Personally, I don't see the benefit of marking most of the Runtime as
private.

On 03/25/2011 01:14 PM, Guillaume Pichard wrote:

> Hello,
>
> I am trying to use pytables with python.net <http://python.net>. It is
> working great with python alone. What I am doing with python.net
> <http://python.net> is:
>              PythonEngine.Initialize();
>              PythonEngine.AcquireLock();
>
>              PyObject sys = PythonEngine.ImportModule("sys");
>              PyObject path = sys.GetAttr("path");
>              PyObject append = path.GetAttr("append");
>              PyObject[] a = new PyObject[1];
>              a[0] = new PyString("C:\\Python27\\Lib\\site-packages");
>              append.Invoke(a);
>
>              PyObject pyTables = PythonEngine.ImportModule("tables");
>              if (pyTables == null)
>                  throw new PythonException();
>
> The exception message is "ImportError : DLL load failed: Specified
> module not found."
>
> What could be the differences between python.net <http://python.net> and
> python ? Is there any specific path to add ?
>
> Thanks a lot,
> Guillaume.
>
>
>
> _________________________________________________
> Python.NET mailing list - [hidden email]
> http://mail.python.org/mailman/listinfo/pythondotnet
_________________________________________________
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http://mail.python.org/mailman/listinfo/pythondotnet