[vtkusers] vtkGenericDataObjectReader, error handling

[Michal Szostakiewicz]

> I looked at this ErrorObserver class, but is there any way to use this
> technique in Java wrapper?
>
> What I basically need is just to "ignore" all the errors... Maybe there is
> some "built-in" vtkCommand to do that?

OK, I found _some_ solution - I though it would be nice to post it here -
but I still have some questions :)

So, first of all I come across this great wiki document and example:
http://www.vtk.org/Wiki/VTK/Java_Wrapping
What's especially interesting is this:

        vtkNativeLibrary.DisableOutputWindow(null);

part (although loading native library method also looks nice)

It almost resolves my error handling problem, but still I wonder:
1. Is there any way to just _ignore_ all the errors (i.e. not to log them
to any file)?
2. If not, I would prefer to log them to my existing logfile. I can do
that by passing a File to DisplayOutputWindow, but it looks like this file
is always overwritten. Perhaps it would be a good idea to also add an
option if the file should be appended or not.

For the convenience of those of you who don't know Java wrapper,
DisplayOutputWindow "unrolls" to:

    public static void DisableOutputWindow(File logFile) {
        if(logFile == null) {
           logFile = new File("vtkError.txt");
        }
        vtkFileOutputWindow outputError = new vtkFileOutputWindow();
        outputError.SetFileName(logFile.getAbsolutePath());
        outputError.SetInstance(outputError);
    }

So I believe it's just a matter of adding

    outputError.SetAppend(1);

but I'm not really an expert :)


Best regards,
Michał