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PyTables working with python not working with python.net

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Guillaume Pichard

PyTables working with python not working with python.net

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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Python.NET mailing list - [hidden email]
http://mail.python.org/mailman/listinfo/pythondotnet

Tanmoy-2

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

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.

_________________________________________________
Python.NET mailing list - [hidden email]
http://mail.python.org/mailman/listinfo/pythondotnet

--
Tanmoy Mukherjee

_________________________________________________
Python.NET mailing list - [hidden email]
http://mail.python.org/mailman/listinfo/pythondotnet

Barton

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

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

_________________________________________________
Python.NET mailing list - [hidden email]
http://mail.python.org/mailman/listinfo/pythondotnet

Barton

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

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

_________________________________________________
Python.NET mailing list - [hidden email]
http://mail.python.org/mailman/listinfo/pythondotnet