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জুলাই 2009

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Scripting with a managed object using python.net engine
by Fedry Kemilau 3 জুলাই, 2009

3 জুলাই, 2009

Dear all, Currently, I am facing an issue to do scripting with a managed object in python engine. I managed to import the module and set an attribute value to the managed object. The issue is in the next step where I am trying to use the module in a statement/expression via PythonEngine.RunString or RunSimpleString method. As far as I know: - RunString() is not working because it always return null value. I tried running a simple expression, e.g., "1 + 1", and it returned null value. I believe the fix here<http://osdir.com/ml/python.dotnet/2007-03/msg00009.html> could solve this bug (if it really is...) - RunSimpleString() executes expression from the __main__ module implicitly. I have not found any possible way yet to include the module I've imported in the beginning into __main__ module. So... I made a little modification on the code by creating a new class that represents the Python Module object. This is how I use the modification in my code. > PythonEngine.Initialize(); // create __main__ and my own module PyModule __main__ = new > PyModule(PythonEngine.ImportModule("__main__")); PyModule birdwrapper = new > PyModule(PythonEngine.ImportModule("birdwrapper")); > // set the value of the attribute to a managed object birdwrapper.SetAttr("pet", PyObject.FromManagedObject(new > Eagle("Foo"))); > // include my own module in the __main__ module __main__.AddObject("birdwrapper", birdwrapper); > // run the script from this method because it is called from > the __main__ module PythonEngine.RunSimpleString("birdwrapper.Fly()"); > PythonEngine.Shutdown(); ++ in runtime.cs: > internal static bool PyModule_Check(IntPtr ob) { return PyObject_TYPE(ob) == Runtime.PyModuleType; } [DllImport(Runtime.dll, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true, CharSet = CharSet.Ansi)] internal unsafe static extern int PyModule_AddObject(IntPtr module, string name, IntPtr value); pymodule.cs: > public class PyModule : PyObject { > public PyModule(IntPtr ptr) : base(ptr) { } > public PyModule(PyObject o) : base() { if (!IsModuleType(o)) { throw new ArgumentException("object is not a module"); } Runtime.Incref(o.obj); obj = o.obj; } > public PyModule(string name) : base() { obj = Runtime.PyModule_New(name); if (obj == IntPtr.Zero) { throw new PythonException(); } } > public static bool IsModuleType(PyObject value) { return Runtime.PyModule_Check(value.obj); } > public void AddObject(string name, PyObject value) { int op = Runtime.PyModule_AddObject(obj, name, value.obj); if (op != 0) throw new PythonException(); } > } I hope the code could illustrate what I am basically trying to achieve with python.net. I wonder if there is a possible way to do this without modifying the code. Could anyone please advise? -- Best regards, Fedry Kemilau

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