[vtkusers] Error using vtkXMLMultiBlockDataWriter

[Adriano Gagliardi]

Dear Users,

I have been having an issue with the vtkXMLMultiBlockDataWriter class that
contain instances of vtkPolyData. The code follows. Note that this same
piece of code works fine if the data within the blocks is of type
vtkUnstructuredGrid:

####
//mbdata is a pointer to a vtkMultiBlockDataSet containing either
vtkPolyData or vtkUnstructuredGrid data sets
vtkXMLMultiBlockDataWriter* writer = vtkXMLMultiBlockDataWriter::New();
std::ostringstream ss;
ss << "debugFiles/data_out.vtm";
writer->SetFileName(ss.str().c_str());
writer->SetInput(mbdata);
writer->Write();
writer->Delete();
ss.str(std::string());
####

When using this, I get the following error message:

####
ERROR: In
/usr/people/gagliard/Paraview/FILES/VTK5.6/VTK/IO/vtkXMLWriter.cxx, line 607
vtkXMLPolyDataWriter (0x13473b00): Error opening output file "debugFiles"

ERROR: In
/usr/people/gagliard/Paraview/FILES/VTK5.6/VTK/IO/vtkXMLWriter.cxx, line 610
vtkXMLPolyDataWriter (0x13473b00): Error code "Is a directory"

ERROR: In
/usr/people/gagliard/Paraview/FILES/VTK5.6/VTK/Filtering/vtkExecutive.cxx,
line 757
vtkStreamingDemandDrivenPipeline (0x134743c0): Algorithm
vtkXMLPolyDataWriter(0x13473b00) returned failure for request:
vtkInformation (0x1347ac00)
  Debug: Off
  Modified Time: 45234
  Reference Count: 1
  Registered Events: (none)
  Request: REQUEST_DATA
  ALGORITHM_AFTER_FORWARD: 1
  FORWARD_DIRECTION: 0
  FROM_OUTPUT_PORT: -1
####

I am, however, able to write out each block separately using
vtkXMLPolyDataWriter:

####
for ( vtkIdType currBlk = 0; currBlk != mbdata->GetNumberOfBlocks();
++currBlk ) {
  vtkXMLPolyDataWriter* writer = vtkXMLPolyDataWriter::New();
  std::ostringstream ss;
  ss << "debugFiles/data_out" << currBlk << ".vtp";
  writer->SetFileName(ss.str().c_str());
  writer->SetInput(mbdata->GetBlock(currBlk));
  writer->Write();
  writer->Delete();
  ss.str(std::string());
}
####

I am wondering if I'm missing something fundamental that may cause that
error. Hopefully someone else can point out the error as I'm not seeing it.

Cheers,

Adriano

===================================

Adriano Gagliardi MEng PhD
Business Sector Leader
Computational Aerodynamics
Aircraft Research Association Ltd.
Manton Lane
Bedford

Tel: 01234 32 4644
E-mail: agagliardi at ara.co.uk
Url: www.ara.co.uk 


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