[vtkusers] Problem with vtkTable and vtkVariantArray

[Roger Blum]

Hi Brian,

Thanks for these links. I have checked them out and they show I'm on the
right track. Querying works. The only problem left now is to get the
values from the result set (vtkQueryRow) into Tcl variables :-).

Roger

Wylie, Brian wrote:
> Just adding to the list...
> 
> I particularly like the python examples...
> 
> database.py, database2.py, mysql_database.py, etc in VTK\Examples\Infovis\Python. They show nice small examples of connecting to a database pulling information as tables and constructing graphs.
> 
> and also the EasyView example shows databases, tables, trees, and Qt all together...
> 
> in VTK\Examples\Infovis\Cxx\EasyView
> 
>   Brian Wylie - Org 1424
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> -----Original Message-----
> From: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] On Behalf Of Jeff Baumes
> Sent: Tuesday, March 31, 2009 5:27 AM
> To: Roger Blum
> Cc: vtkusers at public.kitware.com
> Subject: Re: [vtkusers] Problem with vtkTable and vtkVariantArray
> 
> On Tue, Mar 31, 2009 at 5:08 AM, Roger Blum <rogerblum at hawaii.rr.com> wrote:
>> My questions:
>> - Is there an easier way to extract the data from the vtkRowQuery
>>  object?
> 
> Your way is the easy way to do it in C++, but it is not currently available in wrapped languages. The problem is vtkVariant, which is a lightweight, stack-based object that does not subclass from vtkObject.
> No methods that take or return a variant are wrapped.
> 
>> - Why is method GetValue with 2 params invalid when the online doc
>>  tells me this method exists? Maybe a wrapping problem?
> 
> Yes, it is a wrapping issue.
> 
>> - How else can I read the values of vtkTable and/or vtkVarianArray
> 
> vtkTable's data is internally stored as a collection of arrays that are uniformly-typed, just like attributes of other data objects in VTK. You can access the columns through table->GetColumn(i) or
> table->GetColumnByName(name), which are wrapped. The column array
> types should match the types in the database. vtkVariantArray is currently essentially unaccessable through wrappers, since you cannot set or retrieve values.
> 
>> - Are there any examples available for the newer Vtk classes?
> 
> Some of the newer data objects (table, graph, tree) were made primarily for the infovis effort in VTK. See Examples/Infovis and the tests in Infovis/Testing/Cxx and Views/Testing/Cxx. Some rudimentary documentation is available for Titan (i.e. infovis in VTK) at http://www.sandia.gov/Titan and http://www.kitware.com/InfovisWiki.
> There are plenty of other new classes; search for tests or examples that use them in the VTK repository.
> 
> Jeff
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