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An additional note:

This issue should have no effect on LCIO files converted from our EVIO data, as the LCIO MCParticle class was what changed (and this is not used in output from data as far as Iím aware).

So it is primarily something to keep in mind when doing MC analysis.

On Aug 11, 2016, at 1:14 PM, McCormick, Jeremy I. <[log in to unmask]> wrote:

> Hello,
> 
> Iíve just realized that changes to lcsim I made require us to use the trunk version of the C++ binding for now instead of a tag.  I had to update lcsim so that we did not diverge from the official C++ version of the API, and in doing this we are now using data fields that require us to use only more recent versions of the C++ library.
> 
> If you are having trouble reading LCIO files with the C++ binding, please donít panic.  You are probably seeing this issue.  All you should need to do is rebuild the C++ library from the current trunk.  This will make sure you have an LCIO library with version > 2.6 which will make everything work.  I have verified that I can read some pretty old MC data (written by hps-java 3.5-SNAPSHOT for instance).
> 
> To verify that files are readable from C++ you can run
> 
> lcio/bin/dumpevent fileName numEvents
> 
> If you are still having issues reading any files within Java or C++ then let me know (I have checked several for readability in both C++ and Java but more testing wouldnít hurt).
> 
> There is going to be a 2.7 LCIO release at the beginning of September which we can use but for the next few weeks please stick with the trunk!
> 
> óJeremy
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