[vtkusers] serialize a vtk object to a xml string, not to save it to a file

[Xiaoping Chen]

Thank you so much, David, but we are currently using the following
class to get serialized vtk xml string in C++

vtkXMLPolyDataStreamWriter is derived from vtkXMLPolyDataWriter.

/////// c++ header file

#ifndef _VTKXMLPOLYDATASTREAMWRITER_H_INCLUDED_
#define _VTKXMLPOLYDATASTREAMWRITER_H_INCLUDED_
#include <ostream>
#include <vtkXMLPolyDataWriter.h>
class vtkXMLPolyDataStreamWriter : public vtkXMLPolyDataWriter
{
   public:
       static vtkXMLPolyDataStreamWriter* New();
       virtual void SetUserStream(std::ostream& output_stream);
   protected:
       vtkXMLPolyDataStreamWriter();
       ~vtkXMLPolyDataStreamWriter();
       virtual int WriteInternal();
};
#endif // _VTKXMLPOLYDATASTREAMWRITER_H_INCLUDED_




///----------------- c++ source file

#include "vtkXMLPolyDataStreamWriter.h"
#include <vtkOutputStream.h>
#include <vtkObjectFactory.h>
vtkStandardNewMacro(vtkXMLPolyDataStreamWriter);
vtkXMLPolyDataStreamWriter::vtkXMLPolyDataStreamWriter()
{
}

vtkXMLPolyDataStreamWriter::~vtkXMLPolyDataStreamWriter()
{
}

void vtkXMLPolyDataStreamWriter::SetUserStream(std::ostream& output_stream)
{
   this->Stream = &output_stream;
   this->Stream->precision(11);
   this->DataStream->SetStream(this->Stream);
}

int vtkXMLPolyDataStreamWriter::WriteInternal()
{
   (*this->Stream).imbue(vtkstd::locale::classic());
   return this->WriteData();
}


//----------- call as the following

       //-- serizlize vtk objects to vtkString
       vtkSmartPointer<vtkXMLPolyDataStreamWriter> writer =
vtkXMLPolyDataStreamWriter::New();
       std::ostringstream oss;
       writer->SetUserStream(oss);
       writer->SetInput(polyData);
       writer->Update();

#ifdef _DEBUG
       std::cout << "######## serialized points: " <<oss.str() <<std::endl;
#endif

       //load serialized vtk xml to output parameter
       sVTKXml = oss.str();



but I have trouble to do the same in vtk Java wrapper because I can't
find any equivalent calls for the following statements in Java

   this->Stream = &output_stream;
   this->Stream->precision(11);
   this->DataStream->SetStream(this->Stream);
   this->WriteData();


Any idea?


Thanks again.

Eric

On Mon, Aug 8, 2011 at 5:24 PM, David E DeMarle
<dave.demarle at kitware.com> wrote:
> I don't think the vtk XML readers/writers have a buffer IO feature,
> but the pure vtk readers/writers do. see
> vtkDataReader::SetReadFromInputString() in
> http://www.vtk.org/doc/nightly/html/classvtkDataReader.html
>
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 28 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-371-3971 x109
>
>
>
> On Mon, Aug 8, 2011 at 4:45 PM, Xiaoping Chen <xpchen5871 at gmail.com> wrote:
>> Could someone help on this issue (use a vtkXMLPolyDataWriter instance
>> to create a serialized vtk xml string)?
>>
>> On Thu, Jul 28, 2011 at 4:07 PM, Xiaoping Chen <xpchen5871 at gmail.com> wrote:
>>> Hello,
>>>
>>> I am creating a client-server application. The server will be
>>> Java-based, running in Linux and the client is C++-based, running in
>>> Windows.
>>>
>>> The server will map our internal data into the VTK objects and
>>> serialized them into the xml strings and then send to the client.
>>>
>>> I am able to do this in C++ but not able to do it in VTK Java wrapper.
>>>  vtkXMLPolyDataWriter allows me to serialize the vtk object and save
>>> it to a file but NOT allow me to turn it into a xml string.
>>>
>>> Please help.
>>>
>>> Eric
>>>
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