[Paraview] How to pass array from Server to Client with as 'Information Helper"

[Utkarsh Ayachit]

Try returning a vtkIntArray from your reader instead and use
<IntArrayInformationHelper /> as the information helper. (Look at it's
use in readers.xml).

Utkarsh

On Fri, Mar 26, 2010 at 4:36 PM, Michael Jackson
<mike.jackson at bluequartz.net> wrote:
> The problem is down in a generated file on the server side.
>
>  if (!strcmp("GetNeighborList",method) && msg.GetNumberOfArguments(0) == 3)
>    {
>    vtkClientServerStreamDataArg<int    > temp0(msg, 0, 2);
>    if(temp0)
>      {
>      op->GetNeighborList(temp0);
>      return 1;
>      }
>    }
>
> The problem is that msg.GetNumberOfArguments(0) returns 2 and NOT 3. I have
> no idea of the internals of the msg object to try and figure out what is
> trying to be passed. Is the client sending in a index also? 2 pointers? no
> idea.
>
> I'll just assume from this that it is basically impossible to pass an array
> from the server to the Client in an "Information Only" fashion. I guess I
> can encode the values to a string and send that. Seems odd to have to encode
> the data into a string...
>
> If anyone else has a better Idea I would much appreciate it.
> ___________________________________________________________
> Mike Jackson                      www.bluequartz.net
> Principal Software Engineer       mike.jackson at bluequartz.net
> BlueQuartz Software               Dayton, Ohio
>
>
> On Mar 26, 2010, at 3:23 PM, Michael Jackson wrote:
>
>> I have a custom reader. Part of the reader is getting a "NeighborList"
>> which is an vtkIntArray object although I have declared the following
>> methods in my "reader" class:
>>
>>  int* GetNeighborList();
>>  void GetNeighborList(int* list);
>>  vtkIdType GetNumberOfNeighbors();
>>
>> And in my ServerManagerXML file I have the following:
>>     <IntVectorProperty name="NeighborList"
>>       command="GetNeighborList"
>>       argument_is_array="1"
>>       number_of_elements="0"
>>       repeat_command="0"
>>       number_of_elements_per_command="1"
>>       use_index="0" >
>>       <SimpleIntInformationHelper />
>>       <Documentation>
>>           This property lists the neighbors of the grain
>>         </Documentation>
>>       </IntVectorProperty>
>>
>> On the Client side I have the following bit of code to populate a
>> QListWidget:
>>
>> void pqH5TiDataReaderPanel::updateNeighborList(QListWidget* qListWidget,
>> QString property)
>> {
>>  vtkSMProperty* smProperty =
>> this->proxy()->GetProperty(property.toAscii());
>>  if (NULL == smProperty)
>>  {
>>   std::string msg = "SMProperty [int] was NULL for ";
>>   msg.append(property.toAscii() );
>>   DebugTrace(<< msg.c_str() );
>>   return;
>>  }
>>  vtkSMIntVectorProperty* intProperty
>>                   = vtkSMIntVectorProperty::SafeDownCast(smProperty);
>>  if (NULL == intProperty)
>>  {
>>   std::string msg = "Could not SafeDownCase to vtkSMIntVectorProperty for
>> property ";
>>   msg.append(property.toAscii() );
>>   DebugTrace(<< msg.c_str() );
>>   return;
>>  }
>>  //intProperty->GetArgumentIsArray();
>>  int* elements = intProperty->GetElements();
>>  int nElements = intProperty->GetNumberOfElements(); //<== ALWAYS 0
>>  qListWidget->clear();  // Remove all the content
>>
>>  for (int i = 0; i < nElements; ++i)
>>  {
>>   qListWidget->addItem(QString::number(elements[i])); //<==== NEVER GETS
>> HERE
>>  }
>> }
>>
>> So, what am I doing wrong? I have tried reading through the relevant
>> sections of the "ParaView Guide" but nothing is really jumping out. Also
>> went looking for examples somewhere in the ParaView source code but came up
>> empty. The ContourWidget is close but it "sends" its array, it never
>> receives one from the server.
>>
>> Any pointers would be great and much appreciated.
>> ___________________________________________________________
>> Mike Jackson                      www.bluequartz.net
>> Principal Software Engineer       mike.jackson at bluequartz.net
>> BlueQuartz Software               Dayton, Ohio
>>
>>
>
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