Dynamically run multiple VIs and return values

Dear Experts:
I would like to dynamically run 8 VIs from a main VI that esentially do the exact same thing. The only thing that is different is the data passed to the VIs and the data returned. The VI has a loop that can possible run for ever and each of the 8 loops can be started at different points in time. I figure I would use a functional global to pass controls to the VI (loop). I am not sure how I will get data from each loop. I can't use a functional global for this because there is no sequencial timing. The number 8 might change so I can't just make 8 loops in main.
I would like to be a little more clear. How do you return individual data from a VI that has been dynamically launched 8 times at different points in time?

The data type of the queue needs to be a cluster. One element being an ID of some sort (this ID should be passed into the subVI) and another element being the actual data.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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How to pass a function with the same argument multiple times and return values in variables?

The problem I have is I created a function which really is some kind of database. Basically a bunch of:
if (a.value == "this number"){
b.value = "this expression";
Inside the form are 2 dropdown lists that return numerical values which I want to process through that function and put the return value inside separate variables.
var a = this.getField("OPE003.EVEN.1.MIP");
Mip(a);
var result1 = Mip();
I tried to overwriting *a* to process the second field
a = this.getField("OPE003.EVEN.2.MIP");
Mip(a);
var result2 = Mip();
result1 and result2 are put in an array, joined as a string.
Doing so, I always get the last processing twice as the final result.
Can I use a function as a batch processing tool that way?

You are right, I changed the code to what you said but how do I pass another value through my fonction so I can get Result1 and Result2?
is it
var a = this.getField("OPE003.EVEN.1.MIP");
var b = this.getField("OPE003.EVEN.2.MIP");
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Exporting and returning value question

What is different between exporting and returning value in method of a class. if created an object inside the method and exporting it, it means I have a reference to that object inside program. If I use returning value, it means I have a copy of object created inside the method, but the object inside method is destroyed after it ends. Do I understand correctly? if so what do u prefer exporting or returning value? thanks!

Hello Anthony
The major difference is that you can have multiple EXPORTING parameters yet only a single RETURNING parameter. In addition, if you have a RETURNING parameter you cannot have EXPORTING parameters simultaneously.
Defining methods with a single RETURNING parameter is more Java-like than having multiple EXPORTING parameters.
Whenever possible and sensible I prefer RETURNING parameters over EXPORTING parameters because they allow to use the function method call, e.g.:
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Display and return value in select list.

hi,
i want to display the value in select list coming from this quary .
select student_id from class_record where class_id =:p1_class_id and SECTION =:p1_section
minus
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How can i do this.
Thanks
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Ooh, MINUS.... Can you not use a NOT EXISTS in this case, could have a big effect on the execution plan?
Something like this perhaps?
SELECT f_name||' '||l_name,
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FROM class_record a,
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http://www.munkyben.wordpress.com
Don't forget to mark replies helpful or correct ;)

Urgent! Display lookup value and return value at the same time.

We are using pop up lov.
How can we display lookup value and return value at the same time. let me claer..
Our lov query is like fallowing
select dname, deptno from dept
we want to return deptno column into a database bind text item and dname column into a display item (look up)
can we do it (we need to do)
thanks for your help.

We did it .
But pop up key lov (display description return value ) property doesn't appear for tabular forms item.
(Report Attributes pages Tabular Form Element section display As property list)
can we set or not.
Thank you.

Running multiple VIs?

Hi all!
I am still quite new to LabVIEW and I want to achieve listed below.
I have 3 different VIs:
1) VI 1 and 2 need starts simultaneously
2) Both VI 2 and 2 each contains a while loop internally
3) VI 3 is required to start after a time delay after starting of VI 1 and 2
4) All 3 VIs are stop after VI 3 complete its execution
Is it correct if I just simply put VI and VI 2 on the main VI for them to start together?
What can I do for 3) and 4)?
Attachments:
Pic.jpg ‏16 KB

JKSH wrote:
apok wrote:
Since you are new to LV, this can be intimidating....namely using notifiers,parallel loops and dynamic events.
Hi apok,
Why did you use user events instead of native events?
The OP has blocking subVIs that contain long-running loops; how does that intergrate with your architecture?
BTW, you can extend the Merge Errors VI to take 4 inputs (drag the bottom edge) -- no need to create an array first
answers:
producer/consumer architecture is highly effective in running multiple parellel loops or sub vi's with communications in between.
doesnt matter how long the sub.vi is running(that is still controlled by the producer loop), again producer/consumer architechture can communicate back whether with dynamic events(noticing that my example shows how vi3 can control the main vi by dynamic communication) or forth with data or UI control of the sub vi's by the producer loop through equeues or notifiers.
BTW, what you are probably seeing with merge error is an anomoly from translating between versions of LV, try it and see what i mean....believe me that i am not creating an array, its a bug. also, your use of flat sequences makes me question....
When Should I Use a Flat Sequence Structure?
Forcing execution with a flat sequence structure is useful for benchmarking code performance

SQL SELECT and Return values

I have a simple SELECT statement in a Stored Proc that
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values based on
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I know this is DW and not my code as Query Analyser produces
the correct
values every time. Can anyone tell me what code I can use
that is DW
friendly please.
Thanks.

I read your note with a great degree of sympathy but no
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years of trouble free connections. It may not be relevant but the
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are:
Following the avalanche of hints and tips I am pleased to
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Whilst it is covered in the knowledge base I note that others in
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Multithreading and Returning Value from RMI

Hi all,
I have an RMI Object which is Multi Threaded. The scenario is like this:
The client program will pass different program specific codes to the RMI object. Multiple clients can pass same or different codes. If the codes are different they can share common data in an asynchronous way other wise they need to be synchronized.
This RMI object will do some database transactions and will return a value to the client. I am not sure how to return a value to the client which has invoked this method as this method executes asynchronously.
I am sorry if this posting is inappropriate for this forum.
Thanks in Advance
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If the database transaction executes asyncrhonously, the remote method has to wait for it and return the result via the return statement.
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How to know that a method has been called and returning value of a method

Hi, everyone! I have two questions. One is about making judgment about whether a method has been called or not; another one is about how to return "String value+newline character+String value" with a return statement.
Here are the two original problems that I tried to solve.
Write a class definition of a class named 'Value' with the following:
a boolean instance variable named 'modified', initialized to false
an integer instance variable named 'val'
a constructor accepting a single paramter whose value is assigned to the instance variable 'val'
a method 'getVal' that returns the current value of the instance variable 'val'
a method 'setVal' that accepts a single parameter, assigns its value to 'val', and sets the 'modified' instance variable to true, and
a boolean method, 'wasModified' that returns true if setVal was ever called.
And I wrote my code this way:
public class Value
boolean modified=false;
int val;
public Value(int x)
{val=x;}
public int getVal()
{return val;}
   public void setVal(int y)
    val = y;
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     public boolean wasModified()
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}I tried to let the "wasModified" method know that the "setVal" has been called by writing:
if(val==y&&modified==true)
or
if(x.setVal(y))
I supposed that only when the "setVal" is called, the "modified" variable will be true(it's false by default) and val=y, don't either of this two conditions can prove that the method "setVal" has been called?
I also have some questions about the feedback I got
class Value is public, should be declared in a file named Value.java
public class Value
cannot find symbol
symbol : variable y
location: class Value
if(val==y&&modified==true)
*^*
*2 errors*
I gave the class a name Value, doesn't that mean the class has been declared in a file named Value.java*?
I have declared the variable y, why the compiler cann't find it? is it because y has been out of scale?
The other problem is:
Write a class named Book containing:
Two instance variables named title and author of type String.
A constructor that accepts two String parameters. The value of the first is used to initialize the value of title and the value of the second is used to initialize author .
A method named toString that accepts no parameters. toString returns a String consisting of the value of title , followed by a newline character, followed by the value of author .
And this is my response:
public class Book
String title;
String author;
public Book(String x, String y)
   { title=x; author=y; }
   public String toString()
   {return title;
    return author;
}I want to know that is it ok to have two return statements in a single method? Because when I add the return author; to the method toString, the compiler returns a complain which says it's an unreachable statement.
Thank you very much!

Lets take this slow and easy. First of all, you need to learn how to format your code for readability. Read and take to heart
{color:0000ff}http://java.sun.com/docs/codeconv/html/CodeConvTOC.doc.html{color}
Now as to your first exercise, most of it is OK but not this:   public boolean wasModified()
      if (val == y && modified == true)
            return true;
y being a parmeter to the setValue method exists only within the scope of that method. And why would you want to test that anyways? If modified evaluates to true, that's all you need to know that the value has been modified. So you could have   public boolean wasModified()
      if (modified == true)
            return true;
   }But even that is unnecessarily verbose, as the if condition evaluates to true, and the same is returned. So in the final analysis, all you need is   public boolean wasModified()
      return modified;
   }And a public class has to be declared in a file named for the class, yes.
As for your second assignment, NO you cannot "return" two variables fom a method. return means just that: when the return statement is encountered, control returns to the calling routine. That's why the compiler is complaining that the statement following the (first) return statement is unreachable.
Do you know how to string Strings together? (it's called concatenation.) And how to represent a newline in a String literal?
db

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The polling frequency is every 10 minutes, and if the update statement did anything it would take less than 1 second. However I will see 5-10 copies of the update statement running and using resources.
Has anyone seen a db apapter do this?

maybe unit of order and unit of work can help you on that, though i haven't any experience on both topics :
http://download.oracle.com/docs/cd/E12840_01/wls/docs103/jms/uow.html
http://download.oracle.com/docs/cd/E12840_01/wls/docs103/jms/uoo.html
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Procedure which inserted and returns value

i don't know english very vell and sorry about it :(((
i want write a procedure which inserted or updated table and returns it's ID ...
it's my tabel :
DROP TABLE T_STUDENT CASCADE CONSTRAINTS;
CREATE TABLE T_STUDENT
ID NUMBER(10) NOT NULL,
NAME VARCHAR2(100) NOT NULL,
SURNAME VARCHAR2(100) NOT NULL,
AGE NUMBER(38) NOT NULL,
CNAUTHORID NUMBER(10) NULL
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CREATE OR REPLACE procedure sp_InsertUpdate_T_STUDENT
nResID in out NUMBER,
nID in NUMBER,
vchNAME in VARCHAR2,
vchSURNAME in VARCHAR2,
nAGE in NUMBER,
nCNAUTHORID in NUMBER
as
begin
if nID<=0 then
insert into T_STUDENT (NAME,SURNAME,AGE,CNAUTHORID) values (vchNAME,vchSURNAME,nAGE,nCNAUTHORID );
else
update T_STUDENT set NAME=vchNAME,SURNAME=vchSURNAME,AGE=nAGE,CNAUTHORID=nCNAUTHORID
where ID=nID;
end if;
select ID into nResID from T_STUDENT where NAME=vchNAME and
SURNAME=vchSURNAME and AGE=nAGE and CNAUTHORID=nCNAUTHORID;
end;
this procedure is correct but maybe returns more then one ID and i don't want it :( ....... how i can write this procedure otherwise ???

First of all does yout insert statement work??
insert into T_STUDENT (NAME,SURNAME,AGE,CNAUTHORID) values (vchNAME,vchSURNAME,nAGE,nCNAUTHORID )
Should you not insert also the value ID?
The way i would do this was first since u have only have one return value is a function like this:
function sp_InsertUpdate_T_STUDENT
nID in NUMBER,
vchNAME in VARCHAR2,
vchSURNAME in VARCHAR2,
nAGE in NUMBER,
nCNAUTHORID in NUMBER
) return number
is
ln_id number;
begin
if nID<=0 then
insert into T_STUDENT (ID,NAME,SURNAME,AGE,CNAUTHORID) values (SEQ_ID.NEXTVALUE,vchNAME,vchSURNAME,nAGE,nCNAUTHORID ) returning ID into ln_id;
else
update T_STUDENT set NAME=vchNAME,SURNAME=vchSURNAME,AGE=nAGE,CNAUTHORID=nCNAUTHORID
where ID=nID;
ln_id := nID;
end if;
return ln_id;
end;

Script to ping multiple hosts and return domain info to a txt or csv file

Hi,
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I'm sure this must have been done\requested before but I can't seem to find the correct script anywhere
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Try this modification:
$result=@()
Get-Content p:\list.TXT | %{
$start_name = $_
$conn = Test-Connection -ComputerName $_ -Quiet
if(-not $conn)
$start_name = ""
Try
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$dns_host = $dns.HostName
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catch
$dns_host = "invalid host name" #as jrich proposed :)
$dns_ip = "invalid host name" #as jrich proposed :)
$start_name = ""
$HostObj = New-Object PSObject -Property @{
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Sorting and return values from parralell arrays

import java.io.*;
import java.util.*;
class Check{
     String words;
     String signature;
     Check(String w, String s){
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          signature = s;
class Test{
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     static String[]b = new String[100];
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int z = 0;
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          }//end while
          list[k+1] = key;
     }//end for
}//end insertion sort
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          int cmp = key.compareToIgnoreCase(b[mid]);
          if (cmp==0)return mid;
          if (cmp < 0)hi = mid -1;
          else lo = mid + 1;
     }//end while
     return lo;
}//end binarysearch
}//end classAbove is my revise code. Your idea worked fine, thank you. I have a problem though. I tried to create a class eg:
class Check{
String words;//for words
String signature; //for numbers
Check (String w, String s){
words = w;
signature = s;
The idea was to store the word and its signature as an object, after which I would sort. Howerver, when I tried reading in the values eg: check[]=str, number, it did not work. I tried 2 separate arrays, but now I cannot return the correct word. I need some help on this one.
Questions:
How could I combine both arrays so that I could sort them, then search a value in the array and return the correct string?
I tried a class but i could not get it to work.

I'm not going to try to read all that messy code. Here is some advice.
1. Don't use parallel arrays.
2. If you're going to insist on doing it the wrong way and using parallel arrays, then first get your sort working for a single array.
3. If you're going to insist on doing it the wrong way and using parallel arrays, then after getting the sort to work with a single array, in the part where you're swapping elements, whatever you do to swap in the first array, you'll need to do to the second array as well.
4. Break your code down into methods.

Help : Complex parameter and return value in WebService?

Hi guys
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I found that I could not get out every element from para in server-side, but para.size() is showing it contains 10 elements in it. The same thing happen to the return value of this operation, in client, I got an instance of java.util.List class as the return value, when I try
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I guess it has something to with the Serializable issue ,but I have made every List item serializable, why it looks like this??

Hi Kevin,
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Best regards,
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How to attatch sub vi . can we do it the same way as we call functions in C and return values to the main vi?

I am creating a Vi. I want to do a sub function. I want to connect a switch to a toggle flip flop so need to use a push button switch in the input but at the same time take its output to a true/false loop and execute it according to the ourput of the toggle flip flop which will have an ON and OFF state.
Jeril

In the front panel you can r-click the top right icon and "Show Connector". Click which controls and indicator you want to be your interface. Then drag it to your main application and it'll work as a sub-vi. You can do this for all VI's. Just like the "+" VI takes two numbers (controls) and return one result (indicator).
/Y
LabVIEW 8.2 - 2014
"Only dead fish swim downstream" - "My life for Kudos!" - "Dumb people repeat old mistakes - smart ones create new ones."
G# - Free award winning reference based OOP for LV

Dynamically run multiple VIs and return values

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