Tobii Eye Tracker (X120) returning incorrect data in LV but working in C++

Hello,
I have a Tobii Eye Tracker X120 that I've interfaced with LV using a .dll file created with the .NET application TlbImp.exe. Attached are the main VI, callback VI, and the .dll I'm using.
Previously, the OnGazeData event would not fire. This was resolved by creating a new .dll file via TlbImp.exe. Now, the event fires, but with data we don't believe to be correct.
While tracking, the indicator labeled simply Boolean should follow the subject's gaze. x_gazepos_lefteye and y_gazepos_lefteye are floating point numbers from 0 to 1, 0 being the left or top of the screen. In the final version we'll likely find the mean of the left and right eyes' data, but for now we're just trying to get something usable back from the device.
We had one of my coworkers act as a test subject today. While he would gaze into the top-left corner of the monitor, the Boolean indicator would hover in the bottom-right of the screen, or beyond the screen, or occasionally up to the middle of the screen. The device shipped with a sample program in C++ that we use to verify that it's working properly, and it is. The default program displays a square on the screen where you gaze, and that square has been found roughly accurate.
So we're unsure what the problem is, but convinced it has something to do with our LV implementation. In particular, we're wondering of the while loop is appropriate versus an event structure or something similar. My apologies for the block of text, but I feel the situation merits an in-depth explanation. Thank you so much for your time looking all of this over.
- EDC
Attachments:
connectionAndTracking.vi ‏53 KB
fullClusterCallback.vi ‏21 KB
TetComp.zip ‏22 KB

Hi Evan,
Shooting from the hip it looks like you might want to invert the coordinant system and do some running averaging to smooth out your data and correct the inversion you're seeing. DLLs are a bit of a black box and your system looks to simply be reading back what the DLL is generating. Have you contacted Tobii or examined the c++ program to look for behaviors like this? It might be a useful exploration.
Also, I'd examine the coordinants and how they trend. You find patterns, you can always implement some math to do correction or autoscaling if needed. The way LabVIEW calls into .NET assemblies is pretty simple and shouldn't behave much different than a c++ call, it will just look different. Does software processing not handle the problems you're encountering?
Verne D. // LabVIEW & SignalExpress Product Support Engineer // National Instruments

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Edited by: 906061 on Jun 19, 2012 2:22 AM

T.PD wrote:
906061 wrote:
Result Without last Check <where rownum=1> in the query (in both 10g and 11g)
RATING_AGENCY_ID     ROWNUM
3     1
1     2
Result of the query in 11gR2 (11.2.0.3)
RATING_AGENCY_ID     ROWNUM
1     1
Result of the query in 10gR2 (10.2.0.3)
RATING_AGENCY_ID     ROWNUM
3     1Your desired result depends on the wrong idea if implicid ordering of the results. there is no such!
Database does not sort returned rows any how (unless you use order by in your query). The order of returned rows may be consistent over a long period but if the table contents is reorganized or (as I assume) you import data to anotehr database the order may change.
To make the long storry short: you need another filter condition than <tt>rownum = 1</tt>.
bye
TPDLook closely: it looks like a standard top-n query with the order by in the sub-query.

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Hi
You can use TDMS file format to save the data. I have attached a reference Vi.
On button click you can log the data or remove the case structure and continuous log the complete acquisition data.
Thanks and Regards
Himanshu Goyal
Thanks and Regards
Himanshu Goyal | LabVIEW Engineer- Power System Automation
Values that steer us ahead: Passion | Innovation | Ambition | Diligence | Teamwork
It Only gets BETTER!!!
Attachments:
Data Save in File.vi ‏35 KB

VISA Read gets incorrect data from serial connection

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Attachments:
Serial_Read_debugging.vi ‏13 KB

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Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps

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Data displays properly on BOXIR2 SP2.
Steps to reproduce.
1.Use u2018Island Resort Marketingu2019 Universe to create a WebI report.
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Hi Hiteshwar,
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Thanksu2026
Pratik

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*Description of Problem or Question:
Reports defined in Crystal report client do not work correctly when published to Infoview.
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The problem is new since installation of Service Pack 3 fixpack 3.5.
We are using the SAP Integration kit.
Product\Version\Service Pack\Fixpack (if applicable):
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Relevant Environment Information (OS & version, java or .net & version, DB & version):
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Hello,
this is interesting. Check your CR Server settings if there are any limits with regards to rows or timeouts after the installation of FP3.5
If your CR reports are running on a Universe, check the properties of the Universe if there are limitations affected to the rows.
If this all brings no result i would highly recommend to open a Support Message at SAP - maybe thats a Bug coming with FP3.5
Regards
-Seb.

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Ok you can try one thing first, less invasive to see if it clears one set of contacts.
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1. If any post helps you please click the below the post(s) that helped you.
2. Please resolve your thread by marking the post "Solution?" which solved it for you!
3. Install free BlackBerry Protect today for backups of contacts and data.
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Booted from the hardware test disc and all tests passed.
Booted from TechTool Pro disc and all the tests passed.
Booted from Disk Warrior (had to get the "free" update to boot my iMac G5) and rebuilt directory. No errors reported.
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Booted iMac in 'safe' mode. Rebooted iMac normally.
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Sorry but this is not assistance to you but an additional request for help from someone!!!
I had the same thing occur just now!!!! I have used everything in site and keeps returning............
Hope someone has an answer as to why this occured....

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Hi everyone. I have a very reproducible case where the DataTable schema created by the OracleDataAdapter is incorrect. It is driving me crazy :-).
====================
OracleConnection cnn = new OracleConnection("User ID=XXX;Password=XXX;Data Source=XXX");
cnn.Open();
string strQuery = "CREATE TABLE FOO (a INT, b INT)";
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cmdExec.ExecuteNonQuery();
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adp.Fill(dtb);
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=============================
The console output is:
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for the second iteration.
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-- Matt

I agree with the earlier comment stating '...that the caching is happening inside of the ODP layer rather than a lower layer such as OCI. It looks like the caching is occurring in the m_metaData member of the OracleCommand...'.
It looks like all of the caching is indeed taking place in ODP. However there is in fact two levels of cache taking place in your particular example - at the OracleCommand level but also deep inside ODP.Net there is a static MetaData class which has a private member m_pooler that maintains a metadata cache on a per connection basis. Basically even if the OracleCommand object entry m_metaData is reset values still appear inside the internal pool and so there need to be removed too - this cache is indexed initially through a hash of the connection details and then statement text. This is why even a new OracleCommand object but with same statement text on same connection also returns incorrect information.
Within the OracleReader implementations various calls are made to MetaData.Pooler.Get.. calls to retrieve cached information.
I came across a similar problem (not identical) because we are using the 'alter session set current schema...' command and this causes some problems.
Basically it appears a base assumption has been made that the definition of object will not change at runtime (which you can understand) but in my case it is possible that 'select * from emp' say could be execute from the same connection but relate to different objects because name resolution has been adjust using the 'alter session...' command which is a big problem.
I have written some helper routines which enable the internal caches to be 'managed' although it uses some nasty reflection to accomplish this (using private members directly!). It work successfully in my case and I have done a quick change to your example code (added a single call) and it now works, i.e.
cmdExec.CommandText = "CREATE TABLE FOO (c INT, d INT, e INT)";
cmdExec.ExecuteNonQuery();
OracleMetaDataRemover.Remove(cmdQuery, true);
dtb = new DataTable();
adp.Fill(dtb);
If you use the Remove method above and change true to false you will still receive the problem because although the Command has been cleared the details still remain centrally.
The code which accessed above I include below as is (coded for Oracle 10.1.0.3.01 ODP - it may work on other releases but note this could break in future). Ideally methods are required within ODP to allow cleardown/control of this.
using System;
using System.Reflection;
using System.Collections;
using Oracle.DataAccess.Client;
namespace Oracle.DBUtilities
     /// <summary>
     /// Summary description for OracleMetaDataPoolerCleaner.
     /// </summary>
     public class OracleMetaDataPoolerCleaner
          private static string OracleAssemblyShortName = "Oracle.DataAccess";
          private static string OracleMDType = "Oracle.DataAccess.Client.MetaData";
          private static string OraclePoolerType = "Oracle.DataAccess.Client.Pooler";
          // Fast access pointer to internal hash of information
          private Hashtable PooledItems = null;
          private static OracleMetaDataPoolerCleaner _oracleMetaDataPoolerCleanerInstance = null;
          static readonly object _syncRoot = new object();
          private OracleMetaDataPoolerCleaner()
               Assembly OracleDataAccess = null;
               // Get hold of the Oracle Data Access assembly
               Assembly[] LoadedAssemblyList = AppDomain.CurrentDomain.GetAssemblies();
               for(int i=0; i<LoadedAssemblyList.Length && OracleDataAccess == null; i++)
                    Assembly LoadedAssembly = LoadedAssemblyList;
                    string[] AssemblyNameDetails = LoadedAssembly.FullName.Split(',');
                    if (AssemblyNameDetails[0] == OracleMetaDataPoolerCleaner.OracleAssemblyShortName)
                         OracleDataAccess = LoadedAssembly;
               // Make sure located details
               if (OracleDataAccess != null)
                    // Get access to the MetaData cache details
                    Type OracleMetaData = OracleDataAccess.GetType(OracleMetaDataPoolerCleaner.OracleMDType);
                    if (OracleMetaData != null)
                         // Retrieve static pool item
                         FieldInfo f_Pooler = OracleMetaData.GetField("m_pooler", BindingFlags.NonPublic|BindingFlags.Instance|BindingFlags.Static);
                         if (f_Pooler != null)
                              // As we cannot get direct access to the object type assume it is OK
                              object pa = f_Pooler.GetValue(null);
                              if (pa != null)
                                   Type OraclePooler = OracleDataAccess.GetType(OracleMetaDataPoolerCleaner.OraclePoolerType);
                                   if (OraclePooler != null)
                                        FieldInfo f_Pools = OraclePooler.GetField("Pools", BindingFlags.NonPublic|BindingFlags.Instance|BindingFlags.Static);
                                        PooledItems = f_Pools.GetValue(pa) as Hashtable;
                                        if (PooledItems == null)
                                             throw new InvalidOperationException("Unable to initialise metadata cache access...");
          public static OracleMetaDataPoolerCleaner Instance()
               // Make single copy of this item ready for use
               if (_oracleMetaDataPoolerCleanerInstance == null)
                    // Thread safe locking and initialisation - 'double-checked lock'
                    lock(_syncRoot)
                         if (_oracleMetaDataPoolerCleanerInstance == null)
                              _oracleMetaDataPoolerCleanerInstance = new OracleMetaDataPoolerCleaner();
               return _oracleMetaDataPoolerCleanerInstance;
          /// <summary>
          /// Using reflection the process determines the command text
          /// contents of the specified OracleCommand
          /// Note this could simply have been delegated through to the
          /// OracleConnection version using OCommand.Connection
          /// </summary>
          /// <param name="OCommand">OracleCommand object containing command to be retrieved</param>
          /// <returns>Command string located</returns>
          public static string CommandText(OracleCommand OCommand)
               string OracleCommandCommandText = null;
               // Using reflection get direct access to the 'private' member details..
               Type TypeOracleCommand = OCommand.GetType();
               FieldInfo FieldInfoCommandText = TypeOracleCommand.GetField("m_commandText", BindingFlags.NonPublic|BindingFlags.Instance);
               if (FieldInfoCommandText != null)
                    OracleCommandCommandText = FieldInfoCommandText.GetValue(OCommand).ToString();
               return OracleCommandCommandText;
          /// <summary>
          /// Using reflection the process determines the command text
          /// contents of the specified OracleCommand
          /// </summary>
          /// <param name="OReader">OracleDataReader object containing command to be retrieved</param>
          /// <returns>CommandString located</returns>
          public static string CommandText(OracleDataReader OReader)
               string OracleDataReaderCommandText = null;
               // Using reflection get direct access to the 'private' member details..
               Type TypeOracleDataReader = OReader.GetType();
               FieldInfo FieldInfoCommandText = TypeOracleDataReader.GetField("m_commandText", BindingFlags.NonPublic|BindingFlags.Instance);
               if (FieldInfoCommandText != null)
                    OracleDataReaderCommandText = FieldInfoCommandText.GetValue(OReader).ToString();
               return OracleDataReaderCommandText;
          /// <summary>
          /// Using reflection the process determines the hashvalue
          /// specified OracleConnection
          /// </summary>
          /// <param name="OConnection">OracleConnection for which the HashCode is to be retrieved</param>
          /// <returns>HashValue located or -1</returns>
          public static int ConnectionStringHashValue(OracleConnection OConnection)
               int HashValue = -1;
               // Using the Oracle Connection retrieve the hashvalue associated
               // with this connection
               if (OConnection != null)
                    Type TypeOracleConnection = OConnection.GetType();
                    FieldInfo f_ConStrHashCode = TypeOracleConnection.GetField("m_conStrHashCode", BindingFlags.NonPublic|BindingFlags.Instance);
                    if (f_ConStrHashCode != null)
                         HashValue = Int32.Parse(f_ConStrHashCode.GetValue(OConnection).ToString());
               return HashValue;
          /// <summary>
          /// Using reflection the process determines the hashvalue
          /// specified OracleDataReader
          /// </summary>
          /// <param name="OReader">OracleDataReader for which the associated connection HashValue is to be located</param>
          /// <returns>HashValue located or -1</returns>
          public static int ConnectionStringHashValue(OracleDataReader OReader)
               int HashValue = -1;
               // Using reflection get direct access to the 'private' member details..
               Type TypeOracleDataReader = OReader.GetType();
               FieldInfo f_OraConnection = TypeOracleDataReader.GetField("m_connection", BindingFlags.NonPublic|BindingFlags.Instance);
               // Ensure have access to a connection and retrieve has information
               if (f_OraConnection != null)
                    OracleConnection ConnectionValue = f_OraConnection.GetValue(OReader) as OracleConnection;
                    HashValue = OracleMetaDataPoolerCleaner.ConnectionStringHashValue(ConnectionValue);
               // Return the hashvalue information located
               return HashValue;
          /// <summary>
          /// Using reflection the process determines the hashvalue
          /// specified OracleCommand
          /// Note this could simply have been delegated through to the
          /// OracleConnection version using OCommand.Connection
          /// </summary>
          /// <param name="OCommand">OracleCommand for which the associated connection HashValue is to be located</param>
          /// <returns>HashValue located or -1</returns>
          public static int ConnectionStringHashValue(OracleCommand OCommand)
               int HashValue = -1;
               // Using reflection get direct access to the 'private' member details..
               Type TypeOracleCommand = OCommand.GetType();
               FieldInfo f_OraConnection = TypeOracleCommand.GetField("m_connection", BindingFlags.NonPublic|BindingFlags.Instance);
               // Ensure have access to a connection and retrieve has information
               if (f_OraConnection != null)
                    OracleConnection ConnectionValue = f_OraConnection.GetValue(OCommand) as OracleConnection;
                    HashValue = OracleMetaDataPoolerCleaner.ConnectionStringHashValue(ConnectionValue);
               // Return the hashvalue information located
               return HashValue;
          /// <summary>
          /// Using the supplied OracleDataReader internal calls are made
          /// to determine the ConnectionHash and CommandText details which will
          /// then be used to remove the item
          /// </summary>
          /// <param name="OReader">OracleDataReader to be probed to obtain information</param>
          /// <returns>Indicates whether the item was actually removed from the cache or not</returns>
          public bool Remove(OracleDataReader OReader)
               bool Removed = false;
               // Lookup the ConnectionStringHashDetails
               int HashValue = OracleMetaDataPoolerCleaner.ConnectionStringHashValue(OReader);
               if (HashValue != -1)
                    // Lookup the command text and remove details
                    string CommandText = OracleMetaDataPoolerCleaner.CommandText(OReader);
                    // Attempt to remove from the cache
                    Removed = this.Remove(HashValue, CommandText);
               return Removed;
          /// <summary>
          /// Using the supplied OracleCommand internal calls are made
          /// to delegate the call to the OracleConnection version
          /// </summary>
          /// <param name="OCommand">OracleCommand to be probed to obtain information</param>
          /// <returns>Indicates whether the item was actually removed from the cache or not</returns>
          public bool Remove(OracleCommand OCommand)
               // Call into internal other routine
               return this.Remove(OCommand.Connection, OCommand.CommandText);
          /// <summary>
          /// Using the supplied OracleConnection internal calls are made
          /// to determine the ConnectionHash and it uses CommandText details
          /// to remove the item
          /// </summary>
          /// <param name="OConnection">OracleConnection from which the cache object should be removed</param>
          /// <param name="CommandText">CommandText to be removed</param>
          /// <returns>Indicates whether the item was actually removed from the cache or not</returns>
          public bool Remove(OracleConnection OConnection, string CommandText)
               bool Removed = false;
               // Lookup the ConnectionStringHashDetails
               int HashValue = OracleMetaDataPoolerCleaner.ConnectionStringHashValue(OConnection);
               if (HashValue != -1)
                    // Attempt to remove from the cache
                    Removed = this.Remove(HashValue, CommandText);
               return Removed;
          /// <summary>
          /// Routine actually removes the items from the cache if it exists
          /// </summary>
          /// <param name="ConnectionHashValue">ConnectionHash which is used to key into the Pooled items</param>
          /// <param name="CommandText">CommandText to be removed</param>
          /// <returns>Indicates whether the item was actually removed from the cache or not</returns>
          private bool Remove(int ConnectionHashValue, string CommandText)
               bool Removed = true;
               // Retrieve Pooled items for particular hash value
               Hashtable PoolContents = PooledItems[ConnectionHashValue] as Hashtable;
               // Remove item if it is contained
               if (PoolContents.ContainsKey(CommandText))
                    PoolContents.Remove(CommandText);
                    Removed = true;
               return Removed;
     /// <summary>
     /// Summary description for OracleMetaDataRemover.
     /// </summary>
     public class OracleMetaDataRemover
          private OracleMetaDataRemover()
          /// <summary>
          /// Routine which Removes MetaData associated with OracleCommand object
          /// </summary>
          /// <param name="OCommand">OracleCommand to have associated MetaData removed</param>
          /// <returns>Indicates whether the MetaData associated with the OracleCommand was reset</returns>
          public static bool Remove(OracleCommand OCommand)
               bool Removed = false;
               // Retrieve current MetaData values from OCommand
               Type OracleCommandMetaData = OCommand.GetType();
               FieldInfo f_metaData = OracleCommandMetaData.GetField("m_metaData", BindingFlags.NonPublic|BindingFlags.Instance);
               if (f_metaData != null)
                    f_metaData.SetValue(OCommand, null);
                    Removed = true;
               // Indicate Removed from OCommand object
               return Removed;
          /// <summary>
          /// Routine which Removes MetaData associated with OracleCommand object
          /// and allows for the removal of information from the internal cache
          /// </summary>
          /// <param name="OCommand">OracleCommand to have associated MetaData removed</param>
          /// <param name="RemoveFromMetaDataPool">Whether item should be removed from the internal metadata pool too</param></param>
          /// <returns>Indicates whether the MetaData associated with the OracleCommand was reset</returns>
          public static bool Remove(OracleCommand OCommand, bool RemoveFromMetaDataPool)
               bool Removed = false;
               // Remove details from Command
               Removed = Remove(OCommand);
               if (Removed && RemoveFromMetaDataPool)
                    // Remove information form internal cache
                    Removed = OracleMetaDataPoolerCleaner.Instance().Remove(OCommand);
               // Indicated Removed from OCommand and Internal MetaData collection
               return Removed;

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