Hi,
there is a file evtest1.c in evio-4.0 which was used to generate sample file,
it can be modified to generate something else.
Please use everything from recent evio-4.0 and jevio-4.0 from my jlab home
directory or Carl's svn, previous versions are not good, we did some changes
over last week to fix java.
Sergey
> Hi,
>
> It looks like the test file sent earlier by Sergei does not strictly
> conform to the EVIO v4 data format and cannot be read by jevio. Carl
> pointed me to a different sample file that seems to be better. I'm still
> having a few issues with parsing it, but the basics are (mostly) working.
>
> I've replaced the old file with this new one.
>
> http://www.lcsim.org/test/hps/evio4_sample.dat
>
> I have an additional question...
>
> Is there an example anywhere of creating an EVIO v4 file from scratch in a
> Java test program? A C or C++ program would presumably be helpful, too.
>
> For instance, say I had the following Java data structure...
>
> class MyDataClass {
> int t;
> long id;
> short[] adcCounts; // assume this is non-fixed size
> }
>
> How would I map this example class to a composite record and then write
> these events out to an EVIO file on disk? Any tips or sample programs
> that would help me to figure out how to do this?
>
> Creating in-memory events was straightforward in EVIO v3, but with this
> release there is the added complexity of setting valid formatting strings
> in order to be able to correctly read the composite data back, among other
> things.
>
> In the real experiment, we'll be getting data off the ET Ring, but for
> testing purposes it would be very helpful if I could create some valid
> sample data. The test programs I found in jevio 4.0 read in existing
> files but don't create them.
>
> --Jeremy
>
> -----Original Message-----
> From: McCormick, Jeremy I.
> Sent: Tuesday, February 28, 2012 1:43 PM
> To: [log in to unmask]; [log in to unmask]; 'Carl Timmer';
> [log in to unmask]; Neal, Homer A.
> Cc: Graf, Norman A.
> Subject: reading sample Evio v4 file
>
> Hi,
>
> I'm trying to test out the new EVIO 4 Java library. (Thanks for this!)
>
> Sergei sent this sample EVIO v4 file last week, which I'm attempting to
> read and parse using the new Java library.
>
> http://www.lcsim.org/test/hps/evio4_sample.dat
>
> This file has three child structures in each event, containing sample
> composite data in three different formats. I believe that this file
> contains only composite data blocks. (Sergei can probably say more about
> this.)
>
> Several things do not work for me, however.
>
> Firstly, the call to write out an XML file...
>
> reader.toXMLFile(fileName)
>
> fails with the error.
>
> org.jlab.coda.jevio.EvioException: no composite data
> at org.jlab.coda.jevio.CompositeData.<init>(CompositeData.java:168)
>
> Secondly, attempting to actually parse one of the blocks as composite data
> does not work.
>
> The parse error occurs when I attempt to access the second data block.
> The first structure seems okay. But with the second, there is a null
> pointer exception in the CompositeData constructor, just after the call to
> the unpackRawBytesToString() method. A null pointer is returned by this
> method rather than a sized String array. This call occurs just after line
> 133 of CompositeData.java, where some operations are performed on this
> null array object.
>
> Test program is quite simple...
>
> EvioReader reader = new EvioReader(new File(testFileName));
> reader.toXMLFile((new File(testFileName +
> ".xml")).getCanonicalPath()); // Doesn't work!
>
> EvioEvent event = reader.parseNextEvent();
> while (event != null) {
> for (BaseStructure b1 : event.getChildren()) {
> CompositeData compData = b1.getCompositeData(); // Fails on
> second data block.
> }
> event = reader.parseNextEvent();
> }
>
> As you can see, I'm not doing anything fancy/complicated here, just trying
> to read each structure as composite data.
>
> If someone with more expertise could tell me the following, I would
> appreciate it...
>
> Am I doing this right?
>
> Can you reproduce the issue(s)?
>
> Are there any know bugs/issues that would prevent the basic parsing and/or
> the XML output from working for this file?
>
> Is there anything wrong with the sample data file?
>
> etc.
>
> If you need any additional info about this, please let me know. Thanks!
>
> --Jeremy
>
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