[vtkusers] Wrapper classes for .NET, Problems with vtkContourFilter

[megabyte07]

Hello!

I want to use some functions of VTK 5.0 in a VS.NET 2003 - Application written in VB.NET. So I tried
to write simple wrapper classes for .NET. For some VTK objects (e.g. vtkActor) it works fine, some
other objects (e.g. vtkContourFilter) cause errors like

...'System.NullReferenceException'...
Object reference not set to an instance of an object.

when the wrapper class is instanced. The error occurs at the line of the constructor call in the
wrapper class (in the code below:  unmanagedObject = vtkContourFilter::New()).


The constructor and destructor code of the wrapper classes is:


// wrapContourFilter.h

#pragma once
#include "vtkContourFilter.h"

using namespace System;

namespace Wrapper
{

	public __gc class wrapContourFilter
	{
	private:
		vtkContourFilter* unmanagedObject;
		
	public:
		wrapContourFilter(void)
		{
			unmanagedObject = vtkContourFilter::New();
		}
		~wrapContourFilter(void)
		{
			unmanagedObject->Delete();
		} 
	};
}

This code does not work. If I replace the vtkContourFilter by e.g. a vtkActor, it works.

What's wrong?


Clemens Müllner


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