Hello all,
I am still struggling with this problem, so I figured I would re-post the
question to the general list in hopes of getting a wider audience!
Thanks in advance for any help you may provide!
For Completeness, I have verified that I am setting the number of output ports
in my constructor.
Thanks again for any help!
-Joshua Murphy
Laboratory for Atmospheric and Space Physics
University of Colorado, Boulder
Hello,
I am attempting to write a reader that handles both structured grids and
meta-data. It was recommended to me that I use multiple ports, and populate a
vtkTable with the meta-data.
I think I am having some conceptual problems with how this is supposed to work.
I have written a dummy reader in an attempt to get the meta-data working prior
to porting it to my real reader, but I am having trouble…
My understanding is that I need to
1. specify the number of output ports with this->SetNumberOfOutputPorts(2)
2. Populate the output port information
int vtkGenericReader::FillOutputPortInformation(int port, vtkInformation* info)
{
switch(port)
{
case 0:
info->Set(vtkDataObject::DATA_TYPE_NAME(), "vtkStructuredGrid");
break;
case 1:
info->Set(vtkDataObject::DATA_TYPE_NAME(), "vtkTable");
break;
}
return 1;
}
3. Get the informationObject from the outputVector
outputvector->GetInformationObject(1);
4. Get the table data
this->MetaData = dynamic_cast<vtkTable*>
(this->MetaDataOutInfo->Get(vtkDataObject::DATA_OBJECT()));
5. Add string to the table
vtkStringArray *MetaString = vtkStringArray::New();
MetaString->SetName("Meta Data");
MetaString->SetNumberOfComponents(1);
MetaString->InsertNextValue("This is a Test");
MetaString->InsertNextValue("Test 2");
MetaString->InsertNextValue("Test 3");
this->MetaData->AddColumn(MetaString);
It is my understanding that this information should then be available in the
ParaView GUI.
The problems I am having are this:
1. When attempting to get both port information objects on the first call to
RequestInformation(), port 1 returns a NULL object. On the SECOND call to
GetInformation(), both ports are available.
2. All calls to RequestData() only provide access to port 0 in the Output
information Vector. I can access port 1 if I utilize
this->getExecutive()->getOutputInformation(1)
3. When using #2 to get the information, I populate, but I am unsure where/how
things are supposed to be accessible in the GUI.
What I am trying to do is be able to access the meta-data values from within
ParaView so that I can utilize data values, units, model run data, etc.
If anyone can help me understand what is supposed to be going on, or if I am
completely doing something wrong, I would be grateful! Am I missing some
steps? Do I need to have XML code to access the vtkTable?
Thanks,
Joshua Murphy
Laboratory for Atmospheric and Space Physics
University of Colorado, Boulder
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