The best way to read and write?

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  I wrote a program that acquires data from a card DAQmx and he writes on a binary file (attached file and photo). The data I'm acquisition comes 2.5ms, 8-channel / s for at least 5 seconds. What is the best way to read this binary file, knowing that:

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  -J' I need also to see these values and use them later in Matlab.

  I tried the 'chain of array to worksheet', but LabView goes out of memory (even if I don't use all 8 channels, but only 1).

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  I think that access to data is just as fast, what happens to a TDMS file which is an index generated in the TDMS file that says 'the byte positions xxxx data written yyyy' which is the only overload for TDMS files as far as I know.

  We never had issues with data storage. Data acquisition, analysis and storage with > 500 kech. / s, the questions you get are normally most of the time a result of bad programming styles.

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  A list of tutorial in the #3 http://forums.adobe.com/message/2276578 message

  1 - Please NOTE that the PPro CS6 screen may be a little different (I use CS5)

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• Using the same interface CAN read and write

  Hello.

  Can I use the same CAN interface to read and write?

  For example:

  I send you CAN frame using CAN1 to my MCU.

  IF MCU confirmed the order of receiver it immediately sends the echo return command and there different ID to send the command.

  I tried to use CAN1 output framework and then reconfigures CAN1 to frame in queue and retrieve the frame of the echo.

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  I wad jump to use an interface to read and write.

  Thank you

  Ok. I misread your notion of echo. I understand now. I'm sorry.  The code you posted seems reasonable.

  (1) did you notice on or off for the session?

  (2) what baud rate? You can add a parameter of baud rates for the property to be explicit node.

  (3) I don't remember the name of VI, but you can add a status of Comm Get after reading. This will give you some information about the bus - if errors were detected, etc. Which can be useful to help debug.

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• What is the best way to create and release temporary CLOB parameters?

  Oracle Database 11 g Enterprise Edition Release 11.1.0.7.0 - 64 bit Production on Solaris
  
  I have a procedure that calls another procedure with one of the parameters being an IN OUT NOCOPY CLOB.
  
  I create the temporary CLOB in proc_A, make the call to proc_B and then temporary free again.
  In proc_B I create a REFCURSOR and use with dbms_xmlgen to create XML.
  
  To make the code look like at bottom
  

  CREATE OR REPLACE PROCEDURE client_xml( p_client_id IN            NUMBER
                                         ,p_clob      IN OUT NOCOPY CLOB   ) AS
     v_rc         SYS_REFCURSOR;
     v_queryCtx   dbms_xmlquery.ctxType;
     
  BEGIN
     OPEN c_rc FOR
        SELECT col1
              ,col2
              ,col3
          FROM clients
         WHERE client_id = p_client_id;
  
     v_queryCtx := dbms_xmlgen.newContext(v_rc);
     p_clob     := dbms_xmlgen.getXML(v_queryCtx, 0);
   
  END;
  
  -------------------------------------
  
  
  CREATE OR REPLACE PROCEDURE my_proc AS
     v_clob       CLOB;
     v_client_id  NUMBER;
  BEGIN
     v_client_id := 123456;
  
     dbms_lob.createTemporary(v_clob, TRUE, dbms_lob.CALL);
     
     client_xml( p_client_id => v_client_id
                ,p_clob      => v_clob);
  
     dbms_lob.freeTemporary(v_clob);
  END;

  However, I just learned the hard way that IN OUT NOCOPY is a hint and Oracle sometimes creates a local variable for the CLOB in any case.
  One solution is to change the procedure of client_xml above
  

  CREATE OR REPLACE PROCEDURE client_xml( p_client_id IN            NUMBER
                                         ,p_clob      IN OUT NOCOPY CLOB   ) AS
     v_rc         SYS_REFCURSOR;
     v_queryCtx   dbms_xmlquery.ctxType;
     
  BEGIN
     IF NOT NVL(dbms_lob.istemporary(p_clob),0) = 1 THEN
        dbms_lob.createTemporary(p_clob, TRUE, dbms_lob.CALL);
     END IF;
  
     OPEN c_rc FOR
        SELECT col1
              ,col2
              ,col3
          FROM clients
         WHERE client_id = p_client_id;
  
     v_queryCtx := dbms_xmlgen.newContext(p_refcursor);
     p_clob     := dbms_xmlgen.getXML(v_queryCtx, 0);
   
  END;

  My concern is that in the case of Oracle creates a local variable, 2 temporary will be created, but there will be only 1 freeTemporary.
  This led to a memory could flee?
  Or should I be secure with the above solution because I am using dbms_lob. CALL?
  
  Thank you
  
  Arnold
  
  Published by: Arnold vK on January 24, 2012 11:52

  Why don't you:

  1 use a function instead of a procedure
  2. have the function create the temporary CLOB and fill
  3. what return them temp

  This way a copy of the CLOB object is created.

• What is the best way to read data series high speed?

  My goal is to read 14 bytes of binary data of an instrument on the serial RS232 (460800 baud) to 2000 Hz. I didn't get a card series high speed again so I am currently using the standard serial port (115200 baud) and reading at 400 Hz I have configure the port series, empty the buffer, and then enter a while loop to read incoming data. I have a visa 14 bytes read by interation seconds 0.0025 (400 Hz). However it seems that the sensor is spewing data faster that labview can read because the bytes are accumilating in the port. After some time the buffer fills and the program fails.

  Is there a better way to do it?

  Would it not be better to read the larger quantities of data less often, for example as 1400 bytes every 0.25 seconds?

  Thank you

  Hello

  I think it would be good to read several points in a loop, and keep the loop less than 1000 Hz.  I found in the past, have something to run faster than about 10ms tends to fall down when windows loses interest in the process.  So yes, choose the slower you can get away with reading samples - for example to read every 10ms and read 20 samples every time. You should be able to configure your serial port in order to buffer the samples that I guess.

  Also and the issue of windows - if you use a loop "timed" instead of a while loop, so you can force it to an integer value including the ms.  You can also assign a dedicated processor and set the priority to 100, which means that it is less likely to elapse and decide to scan your hard drive for viruses or consult your account e-mail or what he does when he's bored with your program.  Also it "' tells you if the loop has taken longer that planned to run - you can use this to help iron out bugs etc. - report and/or to the user if you missed a few samples.

  http://zone.NI.com/reference/en-XX/help/371361H-01/Glang/timed_loop/

  JP

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  I would like to know, how people do this by creating a guest VM to a VM_Template in ESXi 3.5?

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  Thank you

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• find the best way to learn and begin to

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• Impossible to find the field read and write VI in labview 2009

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• I read and write English but my husband reads and writes in Russian. How can I activate the taskbar of the Russian language?

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• What is the best way to save an array of objects and then load it?

  Hi, what is the best way to save and load an array of objects?

  I hade a code like that, but it does not work:

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