# Using vtk libraries for writing in xml/vtk fileformat using fortran

**URL:** https://discourse.paraview.org/t/using-vtk-libraries-for-writing-in-xml-vtk-fileformat-using-fortran/1305
**Category:** ParaView Support
**Created:** [February 15, 2019, 6:18pm UTC](https://discourse.paraview.org/t/using-vtk-libraries-for-writing-in-xml-vtk-fileformat-using-fortran/1305 "2019-02-15T18:18:57Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![vrkssai](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/v/e19b73/32.png) [@vrkssai](https://discourse.paraview.org/u/vrkssai)
#### Post date: [February 15, 2019, 6:18pm UTC](https://discourse.paraview.org/t/using-vtk-libraries-for-writing-in-xml-vtk-fileformat-using-fortran/1305/1 "2019-02-15T18:18:57Z")

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I wondering if someone would help me on how to install,use vtk libraries to write data in binary format in fortran. Alternatively, suitable modifications to write in binary format from a fortran code wrting files in .vtk in ASCII format are also welcome. I understand that its very easy to write in ASCII and have a writer in place, hence was hoping someone would help me out with the binary format. I am specifically attempting to write unstructured FE grid data in legacy vtk or xml formats in parallel.

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### Author: ![cory.quammen](https://discourse.paraview.org/user_avatar/discourse.paraview.org/cory.quammen/32/11193_2.png) [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)
#### Post date: [February 15, 2019, 6:29pm UTC](https://discourse.paraview.org/t/using-vtk-libraries-for-writing-in-xml-vtk-fileformat-using-fortran/1305/2 "2019-02-15T18:29:15Z")

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This is a questions about VTK. I suggest posting it on the VTK discourse ([discourse.vtk.org](http://discourse.vtk.org)).

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### Author: ![olesenm](https://discourse.paraview.org/user_avatar/discourse.paraview.org/olesenm/32/17416_2.png) [@olesenm](https://discourse.paraview.org/u/olesenm)
#### Post date: [February 19, 2019, 9:28am UTC](https://discourse.paraview.org/t/using-vtk-libraries-for-writing-in-xml-vtk-fileformat-using-fortran/1305/3 "2019-02-19T09:28:30Z")

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I don’t have to deal with Fortran, but probably your best option is with the xml binary format, which is base-64 encoded. The output will not be as compact as using the appended format with raw output, but I’ve found the inline formats (non-appended) formats easier to work with when streaming out multiple fields.