Method RequestData

IO/Image/vtkImageWriter.cxx:87–145

//------------------------------------------------------------------------------

int vtkImageWriter::RequestData(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** inputVector, vtkInformationVector* vtkNotUsed(outputVector))
{
  this->SetErrorCode(vtkErrorCode::NoError);

  vtkInformation* inInfo = inputVector[0]->GetInformationObject(0);
  vtkImageData* input = vtkImageData::SafeDownCast(inInfo->Get(vtkDataObject::DATA_OBJECT()));

  // Error checking
  if (input == nullptr)
  {
    vtkErrorMacro(<< "Write:Please specify an input!");
    return 0;
  }
  if (!this->WriteToMemory && !this->FileName && !this->FilePattern)
  {
    vtkErrorMacro(<< "Write:Please specify either a FileName or a file prefix and pattern");
    this->SetErrorCode(vtkErrorCode::NoFileNameError);
    return 0;
  }

  // Make sure the file name is allocated
  this->InternalFileNameSize = (this->FileName ? strlen(this->FileName) : 1) +
    (this->FilePrefix ? strlen(this->FilePrefix) : 1) +
    (this->FilePattern ? strlen(this->FilePattern) : 1) + 10;
  this->InternalFileName = new char[this->InternalFileNameSize];

  // Fill in image information.
  int* wExt = inInfo->Get(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT());
  this->FileNumber = wExt[4];
  this->MinimumFileNumber = this->MaximumFileNumber = this->FileNumber;
  this->FilesDeleted = 0;

  // Write
  this->InvokeEvent(vtkCommand::StartEvent);
  this->UpdateProgress(0.0);
  if (this->WriteToMemory)
  {
    this->MemoryWrite(2, input, wExt, inInfo);
  }
  else
  {
    this->RecursiveWrite(2, input, inInfo, nullptr);
  }

  if (this->ErrorCode == vtkErrorCode::OutOfDiskSpaceError)
  {
    this->DeleteFiles();
  }

  this->UpdateProgress(1.0);
  this->InvokeEvent(vtkCommand::EndEvent);

  delete[] this->InternalFileName;
  this->InternalFileName = nullptr;
  this->InternalFileNameSize = 0;

  return 1;