Wizard control with VI in a subpanel, passing input and output

Objective: To create a 3 step wizard-like interface utilizing a tab control. The middle tab in the tab control needs to contain the front panel of separate "processing" VI. The processing VI uses the data collected from the previous tab's controls as input parameters. The third tab needs to receive one or more values computed by the processing VI.
EXAMPLE:
Step 1 (ie: Tab1) collects some settings from the user and has a "Next" button. When the user clicks the "NEXT" button, the tab control changes to the second tab.
Step 2 (ie: Tab 2) The second tab contains a subpanel into which we have loaded our "processing" VI. The "processing" VI has an elaborate front panel. We loaded the "processing" VI into a subpanel in order to display the processing VI's front panel. When the "processing" VI completes, we want to switch to Step 3 (ie: Tab 3) passing several result values into Tab 3's controls.
Passing data in/out of a subvi seems very easy, but I'm unable to work out how to pass data in/out of a VI loaded into a subpanel. Any assistance with creating the above user interface structure /logic would be appreciated. We are not stuck on the above architecture just the sequence of events. If there is something that is more appropriate just let me know.

> ..but I'm unable to work out how to pass data in/out of a VI loaded into a subpanel
In order to interact with the controls and indicators on a subpanel, you have to get a reference to them. Then you can read or write them using property nodes. If you get a reference to the subvi itself, you can use methods to set or get values.
Check out the example called Subpanel Templates. It shows one way to get a reference to a control using a vi called LoadandRun_byName*. There is also a vi called FindControlByName* that returns a control/indicator reference. Look at the block diagram of FindControlByName* to see how it finds the references. You can make a version of this vi that gives you the references that you need. Note: Check the LoadandRun_byName* vi if you have questions about how to get the subvi reference.
*It's not easy to find these vis. They are located at:
Program Files\National Instruments\LabVIEW 2009\examples\general\controls\
So in your application you can use property nodes to write the data fron "Tab 1" when you go to "Tab 2" and then write the data from "Tab 2" to "Tab 3" when you go to "Tab 3".
Whether this is the best implementation for your application depends on a few factors. The advantage of this approach is that you can use your subvi without making changes to it. The disadvantage is that you are dynamically calling the subvi.
Some of the down sides of dynamically called vis are:
Not automaticallcy included in builds so you
Property nodes are much slower than wires, but if you are in human time (i.e. user interface stuff), this shouldn't be an issue.
Help the forum when you get help. Click the "Solution?" icon on the reply that answers your
question. Give "Kudos" to replies that help.

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How do I create an xControl with multiple inputs and outputs?

Hello,
i am trying to write a new Xcontrol Element. In the data model I can create data types using the cluster to create compound types, eg an int and an int array. But how do I create an xcontrol which has multiple data inputs and outputs?
Kind Regards

Limping_Twerp wrote:
Alright: I see: An xcontrol is either an input OR an output. How do I achieve an output? Secondly: So you are saying the only Elements that can have multiple inputs and outputs are VIs?
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[add]
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Producer consumer with analog and digital inputs and outputs

Hi everyone,
I am working on a control system program for some practical test work. Currently I am working on the data acuisition component of the Labview program. My architecture is produced-consumer loops with a que. My system will have analog inputs, analog outputs, digital inputs and digital outputs. It's not a time critical sytem, but I would like all of the data acquisition to be synchronised. I have attached my program as it is at the moment. I am having trouble getting all of the data into the que since I have two data types. Also, I'm not sure if i've synchronised the four read/write sequences correctly. I would greatly appreciate if somebody could take a look at my program and give me some advice. Thanks in advance.
Solved!
Go to Solution.
Attachments:
control_v2_DAQ loop.vi ‏46 KB

Robert, the specific error that I get is:
Error -200462 occurred at DAQmx Start Task.vi:6
Possible reason(s):
Generation cannot be started because the output buffer is empty.
Write data before starting a buffered generation. The following actions can empty the buffer: changing the size of the buffer, unreserving a task, setting the Regeneration Mode property, changing the Sample Mode, or configuring retriggering.
Task Name: Heater testing lab digital outputs
This error occurs at the 'DAQmx write.vi' function. I just want to sent one sample per second, for each channel. I would like the producer and consumer loops to each run once every second.
I have attached part of my code with just the data acquisition and writing. Any help would be greatly appreciated.
Attachments:
control_v2_ML_simple.vi ‏83 KB

Labview Calling DLL with 2D array input and output

Hi all，
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If i define the program in labview like this
The 2 2Darrays sent into CLN were "Array data pointer",then how to define the function in c laguage? just like -----int myfunction (Parameter1,Parameter2,Parameter3,Parameter4)
If the function in the dll is defined like this         int myfunction (double **A, int sx,int sy ,double **B,int ix,int iy),then what will the program in labview will be ?
sx ,sy ix ,iy are the array's size.

ylongwu wrote:
If the function in the dll is defined like this         int myfunction (double **A, int sx,int sy ,double **B,int ix,int iy),then what will the program in labview will be ?
sx ,sy ix ,iy are the array's size.
Your proposed prototype double ** seems to indicate that you want an array of pointers to the rows of the array. That is not how LabVIEW stores multidimensional arrays (nor how this is usually done in C for such arrays).
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Message Edited by rolfk on 05-26-2010 09:11 AM
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Custom action with XML type input and output parameter.

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I want to develop custom action with xml type input and/or output parameter.
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Different family class used for input and output when working with sockets

I have seen more or less everywhere the following code to open a socket and to receive input and send output through it:
Socket server = new Socket("anyservername", 25):
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PrintWriter pout = new PrintWriter (out, true);
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InputStream in = server.getInputStream();
BufferedReader bin = new BufferedReader (new InputStreamReader(in));
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What I do not understand is:
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I would tend to believe that they should be more or less at the same level and use the same arguments?.
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Cheers
Umbi
Edited by: Imbu on Jun 2, 2008 2:40 PM

1. Does it even compile?
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[http://java.sun.com/javase/6/docs/api/]
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So the problem is, why can't I make Firebox my input, and my computer the output, so I can play through the Firebox and hear it on the computer?
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after you create the instrument the perameters box opens on the left. you assign the port and channel there
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to what? the roland? doesn't it have audio output?
I've been reading the manual and have tried various
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Input and output parameter for subpanels

Hi,
i'm creating a measurement configuration tool within LabVIEW and i want
to use subpanels for the several inputs/outputs (analog, digital...).
The configuration data is hold within a data storage (variant) and
contains all needed configuration parameters. Now i placed a subpanel
control and needed stuff inside the block diagram of the wizard and i'm
able to run it. Changes i made in that subpanels are lost currently
because i'm not able to retrieve the output (connector) of the selected
subpanel.
Is there a way to exchange data over the connectors of the vi or do i
have to use global variables in such a case? I hope i can avoid this.
Thanks
Henrik

See the example in this recent posting. To get data from a subpanel, use Get Control Value or Get Control Value [Variant].

MultiThreading with Input and Output Streams

Hi,
I have a problem and I think it's because I'm not coding correctly. Please help me if you can understand what I'm doing wrong.
I have a server that spawns a separate thread to go off and collect data from a serial port. It also waits to accept connections from any client and if a connection is made it will send that data to the clients connected.
There is data constantly coming in through the serial port. It is output through a DataOutputStream so when the thread is created in the server, I pipe it into a DataInputStream. I do does because I want the server to then read in the data from the inputstream and then send it out to all my clients.
So far, the way I have it set up seems to do this. But my problem occurs when I try to close a client connection. Instead of removing the socket connection it gives me an error that it can't send data to the client, but it shouldn't be sending data to the client because I just closed it. I realize this is probably because I'm still constantly receiving data from my inputstream and the connection was closed so it can't send that data to the client. I know I need to either close the stream or close my socket but I don't know where this needs to be done. I'm stuck on the correct way to fix this.
My second problem is the initial connection made to receive data from the inputstream. This is probably because I'm not very familiar with how input/output streams work. But instead of just sending the client the current data being received in real time, it'll send all the data that's buffered in the inputstream. I don't want all the data that's been collecting to go to that first client. I only want the recent data that is coming through while the client is connected. Does this make sense? Because after I make a second client connection I don't have this problem because the InputStream is no longer buffered up. Should I be using something else besides the DataInputStream?
I feel like I'm going about this the wrong way. Please advise. I'm shy about showing the code but I've included the bulk of it here in hopes that someone will see what I'm doing wrong. The only part that's left out is the thread that reads from the serial port. I don't seem to have any problems with that thread.
Thanks,
kim
===
import java.io.*;
import java.net.*;
import javax.comm.*;
import java.util.*;
// DataServer waits for a client connection
class DataServer
     static final int PORT = 7;
     // The ServerSocket to use for accepting new connections
     private ServerSocket ss;
     // A mapping from sockets to DataOutputStreams. This will
     // help us avoid from having to create a DataOutputStream each time
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     private Hashtable outputStreams = new Hashtable();
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     public DataServer() throws IOException
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               // RS232 Thread to an inputstream for the server to read
               PipedOutputStream pout = new PipedOutputStream();
               PipedInputStream pin = new PipedInputStream(pout);
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               datalogger = new DataInputStream(pin);
               // Spawn the thread that will read data through from
               // the TINI serial port
               new RS232Thread( pout ).start();
               // Begin listening for connections and send data
               listen();
          } catch (IOException ioe) {
               System.out.println("Error >> DataServer::DataServer()");
               System.out.println(ioe.getMessage());
               ioe.printStackTrace();
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               try     {
                    System.out.println( "Closing >> DataServer::DataServer()" );
                    datalogger.close();
               } catch (IOException i ) {
                    System.out.println( "Error2 >> DataServer::DataServer()" );
                    System.out.println(i); }
     private void listen() throws IOException
          // Create the ServerSocket
          ss = new ServerSocket( PORT );
          // Inform that the server is ready to go
          System.out.println( "Listening on " + ss );
          // Keep accepting connections forever
          while (true) {
               // Grab the next incoming connection
               Socket s = ss.accept();
               // Inform that connection is made
               System.out.println( "Connection from " + s );
               // Create a DataOutputStream for writing data to the
               // other side
               DataOutputStream dout = new DataOutputStream( s.getOutputStream() );
               // Save this stream so we don't need to make it again
               outputStreams.put( s, dout );
               // Create a new thread for this connection, and then foret
               // about it
               new ServerThread( this, s );
     // Get an enumeration of all the OutputStreams, one for each client
     // connected to the server
     Enumeration getOutputStreams() {
          return outputStreams.elements();
     // Send a message to all clients (utility routine)
     void sendToAll( byte[] b ) {
          // synchronize on this because another thread might be
          // calling removeConnection() and this would screw things up
          // while it walks through the list
          synchronized( outputStreams ) {
               // For each client...
               for (Enumeration e = getOutputStreams(); e.hasMoreElements();) {
                    // ... get the output stream ...
                    DataOutputStream dout = (DataOutputStream)e.nextElement();
                    // ... and send the message
                    try {
                         dout.write( b );
                    } catch(IOException ie) {
                         System.out.println( "Error >> ServerThread::sendToAll()" );
                         System.out.println( ie );
     // remove a socket, and it's corresponding output stream, from the
     // list. This is usually called by a connection thread that has
     // discovered that the connection to the client is dead.
     void removeConnection( Socket s ) {
          // Synchronize so it doesn't mess up sendToAll() while it walks
          // down the list of all output streams
          synchronized( outputStreams ) {
               // Inform about removal
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               // Remove if from our hastable/list
               outputStreams.remove( s );
               // Make sure it's closed
               try {
                    s.close();
               } catch( IOException ie ) {
                    System.out.println( "Error closing " + s );
                    ie.printStackTrace();
     // main - Opens a server socket and spins off a new thread each time
     // a new client connection is accepted on this socket.
     public static void main(String[] args) throws Exception
          System.out.println("Starting DataServer version 1.0 ...");
          try
               new DataServer();
          catch (IOException ioe)
               System.out.println( "Error >> DataServer::main()" );
               System.out.println(ioe.getMessage());
               ioe.printStackTrace();
class ServerThread extends Thread
     //The Server that spawned this thread
     private DataServer server;
     // The Socket connected to the client
     private Socket socket;
     //Constructor
     public ServerThread( DataServer server, Socket socket )
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          this.server = server;
          this.socket = socket;
          // Start up the thread
          start();
     // This runs in a separate thread when start() is called in the
     // constructor
     public void run() {
          try {
               // The inputstream receiving data from the global inputstream
               // that is piped to the RS232 Thread
               // ???? is this where i'm messing up ???
               DataInputStream in = new DataInputStream( server.datalogger );
               int num = 0;
               byte[] d = new byte[1];
               // read from the inputstream over and over, forever ...
               while( ( num = in.read(d) ) > 0 ) {
                    // ... and have the server send it to all clients
                    server.sendToAll( d );
          } catch (IOException ioe) {
               System.out.println( "Error >> ServerThread::run()" );
               System.out.println(ioe.getMessage());
               ioe.printStackTrace();
          } finally {
               // The connection is closed for one reason or another,
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               System.out.println( "Closing" );
               server.removeConnection( socket );

A couple of things to note...
First, you are looping infinitely in your server's constructor. Since the constructor is never completing, your server object is never completely constructed - this may cause indeterminate behaviour when you pass a reference to the server to another thread.
Second, I would recommend fixing your issues by modifying your design somewhat. The design I would recommend (read: The design I would use) is:
A server object, with a public listen method. The constructor spawns a thread to constantly read from the serial port and forward the data read back to the server, via a multicast (sendToAll) method.
The listen method sets up a server socket to accept connections, and in a loop opens client sockets and stores them in a set.
The multicast method iterates through the list of open client sockets, and for each in turn confirms that it is still open. If open, send the data down the socket's output stream; if closed, remove the socket from the set.
Note that this design includes only two threads - the main thread listens for and accepts new socket connections, while the extra thread collects data from the serial port, multicasts it to all of the open sockets, and removes all of the closed sockets. If you require to perform any other communication with the sockets, it may be necessary to create a thread for those sockets, to facilitate reading from their input streams, but in the given design, this is not necessary.
I hope this helps,
-Troy

Please Help - How to pass Table objects as input and output parameters using VC++

Please help me by giving a sample code to call the procedure
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AUTHID CURRENT_USER
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END DBMS_PROPERTYSTORE;

HI
Go to the lay out of your screen and doublr click on the table control fields, you can get the Properties/Attribute of the screen or table control Fields
Assing a Group GRP1 for all the fields i n the table control.
in PBO
if ok_code = 'INPUT'.
LOOP AT SCREEN.
IF screen-grp1 = 'GRP1'.
screen-input = 1.
modify screen.
endif.
ENDLOOP.
elseif ok_code = 'OUTPUT'.
LOOP AT SCREEN.
if screen-grp1 = 'GRP1'.
screen-input = 0.
modify screen.
endif.
endloop.
endif.
Regards
Ramchander Rao.K
Edited by: Ramchander Krishnamraju on Aug 8, 2009 5:27 AM

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Hi,
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Points will be assigned . Help is greatly appreciated.
Thanks,
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I'm using a class named Output which takes 2 arrays as input and is simply supposed to output them to a file named myfile.txt. However, every time I call it it catches an exception and just prints out Error Writing to File. Here is the source:
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Equis.Scry wrote:
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Hello all,
I need one help regarding the positional flat file schema which contains multiple headers, body and trailers.
I have attached the sample input file below. This is a batched input and we have to generate the output which I have given below:
We are unable to flat file schema which replicates the below input file. Please suggest better approach to achieve this.
Sample Input FIle:
010320140211ABC XYZ XYZ ABCD201402110 FSPAFSPA005560080441.02000006557.FSPA.IN AB-CD ABCD/AB-CD BETALKORT
1020140210AN194107123459.FSPA.IN
[email protected]
1020140210AN196202123453.FSPA.IN
[email protected]
1020140210AN198103123435.FSPA.IN
[email protected]
1020140210AN195907123496.FSPA.IN
[email protected]
1020140210AN195903123437.FSPA.IN
[email protected]
1020140210AN193909123434.FSPA.IN
[email protected]
1020140210AN195607123413.FSPA.IN
[email protected]
1020140210AN199205123408.FSPA.IN
[email protected]
1020140210AN196206123499.FSPA.IN
[email protected]
1020140210AN196709123410.FSPA.IN
[email protected]
1020140210AN194708123455.FSPA.IN
[email protected]
1020140210AN195710123443.FSPA.IN
[email protected]
1020140210AN198311123436.FSPA.IN
[email protected]
1020140210AN196712123471.FSPA.IN
[email protected]
1020140210AV197005123403.FSPA.IN
98000000000000014000000000000001000000000000015
010320140211ABC XYZ XYZ PEDB201402111 FSPAICA 005560080441.02000006557.FSPA.IN AB-CDABCD/ABCDBETALKORT
1020140210AN195111123491.ICA.IN
[email protected]
1020140210AV195309123434.ICA.IN
98000000000000001000000000000001000000000000002
Output FIle:
1020140210AN195607123413.FSPA.IN
[email protected]
1020140210AN199205123408.FSPA.IN
[email protected]
1020140210AN196206123499.FSPA.IN
[email protected]
1020140210AN196709123410.FSPA.IN
[email protected]
1020140210AN194708123455.FSPA.IN
[email protected]
1020140210AN195710123443.FSPA.IN
[email protected]
1020140210AN198311123436.FSPA.IN
[email protected]
1020140210AN196712123471.FSPA.IN
[email protected]
1020140210AN195111123491.ICA.IN
110019EPS [email protected]
1020140210AV197005123403.FSPA.IN
1020140210AV195309123434.ICA.IN
98000000000000001000000000000001000000000000002
99000000000000001
Note: Header is a single line till BETALKORT and also there is a space before email id. That is not getting pasted properly in the files.
Thanks and Regards,
Veena Handadi

Hi all,
Header is missed from the output file for the above post:
Please find the output file:
010320140211ABC XYZ XYZ ABCD201402110 FSPAFSPA005560080441.02000006557.FSPA.IN AB-CD ABCD/AB-CD BETALKORT
1020140210AN195607123413.FSPA.IN
[email protected]
1020140210AN199205123408.FSPA.IN
[email protected]
1020140210AN196206123499.FSPA.IN
[email protected]
1020140210AN196709123410.FSPA.IN
[email protected]
1020140210AN194708123455.FSPA.IN
[email protected]
1020140210AN195710123443.FSPA.IN
[email protected]
1020140210AN198311123436.FSPA.IN
[email protected]
1020140210AN196712123471.FSPA.IN
[email protected]
1020140210AN195111123491.ICA.IN
110019EPS [email protected]
1020140210AV197005123403.FSPA.IN
1020140210AV195309123434.ICA.IN
98000000000000001000000000000001000000000000002
99000000000000001

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!

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