Hello,
Thank you both for your advice. I will be sure to pursue both options and see if I can get them working. Thank you again, Nicholas Stegmeier ________________________________ From: David E DeMarle <dave.dema...@kitware.com> Sent: Friday, December 1, 2017 8:35:45 AM To: Mark Olesen Cc: Stegmeier, Nicholas; paraview@paraview.org Subject: Re: [Paraview] Writing XML VTK Binary files from C++ Another approach is to use VTK itself to write the files. Since VTK 6 it is straightforward to configure a VTK build consisting of only the IO/ParallelXML module and its required dependencies. To do so, in cmake, turn of testing, all groups and turn on Module_vtkIOParallelXML, and you should be set. David E DeMarle Kitware, Inc. Principal Engineer 21 Corporate Drive Clifton Park, NY 12065-8662 Phone: 518-881-4909 On Fri, Dec 1, 2017 at 2:34 AM, Mark Olesen <mark.ole...@esi-group.com> wrote: > When you say "writing binary", you need to distinguish between three > possibilities. > 1) writing binary "inline" (actually base64 encoded) > 2) writing binary "append" (actually base64 encoded) > 3) writing raw binary "append" (really raw binary) > > Since you already have ASCII writing working and its content is "inline", it > won't take much more to get binary inline working. > By "inline", I mean when the output is placed between the <xxx> </xxx> > markers. Eg, > <DataArray ...> > content > </DataArray> > > For the binary case, the content is written as base64-encoded data, which > means that your output writer for these sections needs to pass the content > through a base64 layer to do the encoding for you. > > If it helps as reference, we have the same thing in OpenFOAM, except that we > only write vtu and vtp files (we don't have rectilinear meshes). > > In the repo https://develop.openfoam.com/Development/OpenFOAM-plus > we have a foamVtkBase64Formatter and a foamVtkBase64Layer (both under > src/fileFormats/vtk/format/) that add a base64Layer to encode and output as > base64 (src/OpenFOAM/db/IOstreams/hashes/base64Layer.[CH]). > > You'll see that the foamVtkBase64Layer and base64Layer are quite low level > means of adding an tiny encoding buffer (3 chars size) to intercept output > prior to sending through to a std::ostream. It take very little effort to > adopt for your output and thus quite easy to drop in instead of your current > ASCII outputter. For it too work easily, however, you should make sure that > you need to generate your output content with a write() method instead of > using '<<'. This allows somewhat easy switching between something like a > foamVtkAsciiFormatter and the binary version, but more importantly it makes > it easier to track the output state. > > When browsing through the code, you may also notice that we have support for > writing in appended format (raw and base64). However, I would not advise you > to tackle that immediately. There are a few more things to watch out for > here, but more importantly it will change many more things on the calling > side. > > I hope this information helps you. > /mark > > -- > Dr Mark OLESEN > Principal Engineer, ESI-OpenCFD > ESI GmbH | Einsteinring 24 | 85609 Munich | GERMANY > www.openfoam.com<http://www.openfoam.com> | > www.esi-group.com<http://www.esi-group.com> | mark.ole...@esi-group.com > > > On 11/30/17 18:00, Stegmeier, Nicholas wrote: >> >> Hello, >> >> I am new to Paraview and C++ coming from a mostly mathematics background. >> I am emailing to get resources or help on writing binary XML VTK files from >> C++. >> >> I have finally succeeded in using the ASCII XML VTK format for a 2D >> rectilinear CFD application. My ".pvtr" file is shown below. >> >> How can I write this file and my other XML VTK files in binary from C++? >> Do I need a special C++ library? > > _______________________________________________ > Powered by www.kitware.com<http://www.kitware.com> > > Visit other Kitware open-source projects at > http://www.kitware.com/opensource/opensource.html > > Please keep messages on-topic and check the ParaView Wiki at: > http://paraview.org/Wiki/ParaView > > Search the list archives at: http://markmail.org/search/?q=ParaView > > Follow this link to subscribe/unsubscribe: > http://public.kitware.com/mailman/listinfo/paraview
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