[vtkusers] VTK error handling

[John Fraser]

Thanks for your replies.

>>Jothy 
>>Why don't you use a if statement to find out whether the file really exists are not?
>>The try to read it.

I was using a file read as an example, for example the source could fail due to out of memory or some other condition.

>>David, I think he wants to put that logic inside the filter and the find out if it failed outside the filter.

I'm not looking to write my own filter.  What I would like to know is, given a particular VTK source / filter, is it possible to know if the filter's Update method has failed or not?  For example a filter could fail due to out of memory or some other condition, is everyone just assuming these filters will always work and not checking them for any error codes?

I think that ITK supports something like the code below, so what I can do in VTK for the equivalent functionality?
try
{
  Update()
}
catch(...)
{
}

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