How to stop a "for" loop

Hello,
Do you know how I can stop a for loop ? because when I click on the stop switch on my front panel, the VI don't stop and continue to run the loop.
Peter.
Labview 2010
Solved!
Go to Solution.

Peter,
It sounds like you need a while loop, not a for loop. A button or switch does not traditionally control iterations of execution for a for loop.
Please post your code so we may help better.
-Chazzmd

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How to stop a while loop in LabVIEW from a C program

How to stop a while loop in LabVIEW from a C code

hi
I think by creating dll you can stop the while loop from your C program.For that you just create dll (Dynamic Link Library) for the VI which has that while loop.
Anyway can u please explain ur requirement clearly.

How do I use For loop to check each node and import them to a new document?

In my function I would like to use a For loop to get all the statutes (xml) inside the object
objXmlBcaResponseDoc. In my case there are 2 statutes. I would like the output to look like the one I have posted here below. I am not sure how to do the For loop. The commented For loop is from another function but it is not working inside
this function.
The output is added into the **objXmlResponseMessageDoc** object and should look like this with 2 statutes (ns1:Statute) and a totalCount=2
<BasicSearchQueryResponse xmlns="http://crimnet.state.mn.us/mnjustice/statute/service/4.0">
<StatutesXml>
<Statutes runType="Request" runDateTime="2015-03-17T10:23:04" totalCount="2">
<ns1:Statute xmlns:ns1="http://crimnet.state.mn.us/mnjustice/statute/messages/4.0">
<StatuteId xmlns="http://crimnet.state.mn.us/mnjustice/statute/4.0">8471</StatuteId>
<Chapter xmlns="http://crimnet.state.mn.us/mnjustice/statute/4.0">60</Chapter>
<Section xmlns="http://crimnet.state.mn.us/mnjustice/statute/4.0">55</Section>
<Subdivision xmlns="http://crimnet.state.mn.us/mnjustice/statute/4.0"/>
</ns1:Statute>
<ns1:Statute>
<StatuteId xmlns="http://crimnet.state.mn.us/mnjustice/statute/4.0">9722</StatuteId>
<Chapter xmlns="http://crimnet.state.mn.us/mnjustice/statute/4.0">90</Chapter>
<Section xmlns="http://crimnet.state.mn.us/mnjustice/statute/4.0">25</Section>
<Subdivision xsi:nil="true" xmlns="http://crimnet.state.mn.us/mnjustice/statute/4.0"/>
</ns1:Statute>
</Statutes>
</StatutesXml>
</BasicSearchQueryResponse>
My xml doc is found inside objXmlBcaResponseDoc Here is xml inside
objXmlBcaResponseDoc object
<BasicSearchQueryResponse xmlns="http://crimnet.state.mn.us/mnjustice/statute/service/4.0">
<ns1:Statutes xmlns:ns1="http://crimnet.state.mn.us/mnjustice/statute/messages/4.0">
<ns1:Statute>
<StatuteId xmlns="http://crimnet.state.mn.us/mnjustice/statute/4.0">8471</StatuteId>
<Chapter xmlns="http://crimnet.state.mn.us/mnjustice/statute/4.0">60</Chapter>
<Section xmlns="http://crimnet.state.mn.us/mnjustice/statute/4.0">55</Section>
<Subdivision xsi:nil="true" xmlns="http://crimnet.state.mn.us/mnjustice/statute/4.0"/>
</ns1:Statute>
<ns1:Statute>
<StatuteId xmlns="http://crimnet.state.mn.us/mnjustice/statute/4.0">9722</StatuteId>
<Chapter xmlns="http://crimnet.state.mn.us/mnjustice/statute/4.0">90</Chapter>
<Section xmlns="http://crimnet.state.mn.us/mnjustice/statute/4.0">25</Section>
<Subdivision xsi:nil="true" xmlns="http://crimnet.state.mn.us/mnjustice/statute/4.0"/>
</ns1:Statute>
</BasicSearchQueryResponse>
Here is my function
Function GetStatutesByChapter(ByVal aobjXmlGetStatuteRequestNode As XmlNode, ByVal aobjXMLNameSpaceManager As XmlNamespaceManager, ByVal aobjBroker As ServiceCatalog.Library.v4.Broker) As XmlDocument
Dim objXmlRequestMessageDoc As XmlDocument
Dim objXmlResponseMessageDoc As XmlDocument
Dim intCount As Integer
aobjBroker.PostMessageWarehouseInformationalMessage("Chapter found.", 1)
objXmlResponseMessageDoc = New XmlDocument
'Add the first element into the document GetStatuteByChapter with its namespace
objXmlResponseMessageDoc.AppendChild(objXmlResponseMessageDoc.CreateElement("BasicSearchQueryResponse", "http://crimnet.state.mn.us/mnjustice/statute/service/4.0"))
'Build the initial response document
objXmlResponseMessageDoc = New XmlDocument
'Add the first element into the document GetStatutesResponse with its namespace
objXmlResponseMessageDoc.AppendChild(objXmlResponseMessageDoc.CreateElement("GetStatutesResponse", "http://www.courts.state.mn.us/StatuteService/1.0"))
'Add a child node to the GetStatutesResponse node
objXmlResponseMessageDoc.SelectSingleNode("ss:GetStatutesResponse", aobjXMLNameSpaceManager).AppendChild(objXmlResponseMessageDoc.CreateElement("StatutesXml", "http://www.courts.state.mn.us/StatuteService/1.0"))
objXmlResponseMessageDoc.SelectSingleNode("ss:GetStatutesResponse/ss:StatutesXml", aobjXMLNameSpaceManager).AppendChild(objXmlResponseMessageDoc.CreateElement("Statutes", "http://www.courts.state.mn.us/StatuteService/1.0"))
'Convert the node Statutes into an element and set the runType attribute (runType="Request") by adding it's value Request
CType(objXmlResponseMessageDoc.SelectSingleNode("ss:GetStatutesResponse/ss:StatutesXml/ss:Statutes", aobjXMLNameSpaceManager), System.Xml.XmlElement).SetAttribute("runType", "Request")
'Convert the node Statutes into an element and set the attribute (runDateTime="2015-03-05T10:29:40") by adding it
CType(objXmlResponseMessageDoc.SelectSingleNode("ss:GetStatutesResponse/ss:StatutesXml/ss:Statutes", aobjXMLNameSpaceManager), System.Xml.XmlElement).SetAttribute("runDateTime", Format(Now, "yyyy-MM-ddTHH:mm:ss"))
'Create the BCA request message
objXmlRequestMessageDoc = New XmlDocument
objXmlRequestMessageDoc.AppendChild(objXmlRequestMessageDoc.CreateElement("ns:BasicSearchQueryRequest", aobjXMLNameSpaceManager.LookupNamespace("ns")))
objXmlRequestMessageDoc.SelectSingleNode("ns:BasicSearchQueryRequest", aobjXMLNameSpaceManager).AppendChild(objXmlRequestMessageDoc.CreateElement("ns1:BasicSearchCriteria", aobjXMLNameSpaceManager.LookupNamespace("ns1")))
objXmlRequestMessageDoc.SelectSingleNode("ns:BasicSearchQueryRequest/ns1:BasicSearchCriteria", aobjXMLNameSpaceManager).AppendChild(objXmlRequestMessageDoc.CreateElement("ns2:Chapter", aobjXMLNameSpaceManager.LookupNamespace("st")))
objXmlRequestMessageDoc.SelectSingleNode("ns:BasicSearchQueryRequest/ns1:BasicSearchCriteria", aobjXMLNameSpaceManager).AppendChild(objXmlRequestMessageDoc.CreateElement("ns2:Section", aobjXMLNameSpaceManager.LookupNamespace("st")))
objXmlRequestMessageDoc.SelectSingleNode("ns:BasicSearchQueryRequest/ns1:BasicSearchCriteria", aobjXMLNameSpaceManager).AppendChild(objXmlRequestMessageDoc.CreateElement("ns2:Subdivision", aobjXMLNameSpaceManager.LookupNamespace("st")))
'Uncomment last working section below
objXmlRequestMessageDoc.DocumentElement.SelectSingleNode("ns1:BasicSearchCriteria/st:Chapter", aobjXMLNameSpaceManager).InnerText = aobjXmlGetStatuteRequestNode.SelectSingleNode("ss:Statute/ss:Chapter", aobjXMLNameSpaceManager).InnerText
'check if there is a section and or subdivision if it is there then set the value
If Not (aobjXmlGetStatuteRequestNode.SelectSingleNode("ss:Statute/ss:Section", aobjXMLNameSpaceManager) Is Nothing) Then
objXmlRequestMessageDoc.DocumentElement.SelectSingleNode("ns1:BasicSearchCriteria/st:Section", aobjXMLNameSpaceManager).InnerText = aobjXmlGetStatuteRequestNode.SelectSingleNode("ss:Statute/ss:Section", aobjXMLNameSpaceManager).InnerText
End If
If Not (aobjXmlGetStatuteRequestNode.SelectSingleNode("ss:Statute/ss:Subdivision", aobjXMLNameSpaceManager) Is Nothing) Then
objXmlRequestMessageDoc.DocumentElement.SelectSingleNode("ns1:BasicSearchCriteria/st:Subdivision", aobjXMLNameSpaceManager).InnerText = aobjXmlGetStatuteRequestNode.SelectSingleNode("ss:Statute/ss:Subdivision", aobjXMLNameSpaceManager).InnerText
End If
'check if there is a section and or subdivision if it is there then set the value
aobjBroker.PostMessageWarehouseSnapshot(objXmlRequestMessageDoc.OuterXml, "Request Message", 1)
'Call the BCA service
intCount = 0
'This is where I want to use a For loop to check for the statutes found using the Chapter
'Loop through each Id
'For Each objXmlStatuteIdNode In aobjXmlGetStatuteRequestNode.SelectNodes("ss:Statute/ss:StatuteId/ss:Id[string-length(.)>0]", aobjXMLNameSpaceManager)
'Create the BCA request message
'objXmlRequestMessageDoc = New XmlDocument
'objXmlRequestMessageDoc.AppendChild(objXmlRequestMessageDoc.CreateElement("ns:SingleStatuteRequest", aobjXMLNameSpaceManager.LookupNamespace("ns")))
'objXmlRequestMessageDoc.SelectSingleNode("ns:SingleStatuteRequest", aobjXMLNameSpaceManager).AppendChild(objXmlRequestMessageDoc.CreateElement("ns:statuteId", aobjXMLNameSpaceManager.LookupNamespace("ns")))
'objXmlRequestMessageDoc.DocumentElement.SelectSingleNode("ns:statuteId", aobjXMLNameSpaceManager).InnerText = objXmlStatuteIdNode.InnerText aobjBroker.PostMessageWarehouseSnapshot(objXmlRequestMessageDoc.OuterXml, "Request Message", 1)
'intCount = intCount + 1
'objXmlBcaResponseDoc = New XmlDocument
'File name is BCASearchQueryResponse.xml
'objXmlBcaResponseDoc.Load("\\j00000swebint\mscapps\deve\appfiles\temp\BCASearchQueryResponse.xml")
'objXmlResponseMessageDoc.DocumentElement.SelectSingleNode("ss:StatutesXml/ss:Statutes", aobjXMLNameSpaceManager).AppendChild(objXmlResponseMessageDoc.ImportNode(objXmlBcaResponseDoc.DocumentElement.SelectSingleNode("ns1:Statute", aobjXMLNameSpaceManager), True))
'Next
'Count how many Statute nodes found
CType(objXmlResponseMessageDoc.SelectSingleNode("ss:BasicSearchQueryResponse/ss:StatutesXml/ss:Statutes", aobjXMLNameSpaceManager), System.Xml.XmlElement).SetAttribute("totalCount", CStr(intCount))
Return objXmlResponseMessageDoc
End Function

What is XPath and what does it do that you're impressed with?
Yes, I see your link, but give me the abbreviated elevator speech on what it is please. It has me curious.
http://searchsoa.techtarget.com/definition/XPath
http://www.techrepublic.com/article/easily-navigate-xml-with-vbnet-and-xpath/
http://www.techrepublic.com/article/using-xpath-string-functions-in-xslt-templates/
The way that all this is being used by me now on a project is the HTML controls on the screen are built by XML not only about what the controls are and their attributes, but the data from from the database is XML too with both going through transfermations
vis XSLT as the HTML controls are built dynamically by XML data for the controls and the XML database data with decision being made in the transfermation on the fly.
There are many usages with Xpath not just this one I am talking about with Xpath. You can do the same kind of thing with XAML and WPF forms as they are dynamically built. But it goes well beyond what I am talking about and the usage of Xpath. Xpath 3.0
is the latest version.
http://www.balisage.net/Proceedings/vol10/html/Novatchev01/BalisageVol10-Novatchev01.html
Thanks - I'll look into that at some point.
Still lost in code, just at a little higher level.

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Hi friends.
How to stop after first loop operation over?
I have a loop operation in module pool program.
After first loop over I want to stop.
I used the STOP keyword, but it is going to dump.
Thanking you.
Regards,
Subash

Hey,
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How to stop a while loop after certain time using Elapsed time vi

how to stop a while loop after certain time using Elapsed time vi.

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Hi
The main menu runs first and then goes to reading menu. After "Start Reading" button is pressed, the reading process will take readings.
1) During reading process, if the "Pause Reading" button is pressed, I want that the two "for loops" are stopped and the two "for loop" counters do not reset. After the "Start Reading" button is pressed, the two "for loops" will continue to run.
2) During reading process, if the "Stop Reading" button is pressed, I want that the two "for loops" are stopped and the two "for loop" counters are reset. After the "Start Reading" button is pressed, the two "for loops" will run again.
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Steve
Attachments:
Main Menu Test.vi ‏9 KB
Reading Menu Test.vi ‏23 KB

You can't have those loops inside of the event structure. Currently, when you press the start button, the reading has to finish before the event case finishes. This will prevent the stop can cancel buttons from being processed by the event structure.
You need another loop that can recieve commands from the event loop. Look up the Queued Message Handler. That should get you a good start on the command process.
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How to stop a while loop of event structure from a main vi

Hello;
sorry for my english
I have to stop a subvi from my main vi, the subvi contains a while loop and an event structure so I need to stop this loop while directly from my main vi I have tried global variable but it did not work
any help please or example !!!
Solved!
Go to Solution.
Attachments:
stop a while loop and event structure from main vi.png ‏16 KB

IYED wrote:
Hello;
sorry for my english
I have to stop a subvi from my main vi, the subvi contains a while loop and an event structure so I need to stop this loop while directly from my main vi I have tried global variable but it did not work
any help please or example !!!
If this is an example of how your code looks, I'd clean it up before the developer who has to work on it next hits you over the head with his LabVIEW Style Book.
Bill
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Stopping a for loop abruptly

Dear All,
I have a doubt over here...In my frame, I have two buttons...one is "START" and the other is "STOP". If the "START" button is clicked, i am calling a method in which a "FOR LOOP" will start running for 100 times. If the "STOP" button is clicked, I should stop the said for loop, in the middle itself....how to do the above...
any suggestions, solutions, ideas are higly appreciated...
bye,
Sakthivel S.

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Stopping a For Loop, part 2

Hello. Thank you everyone for your help, getting to this point. I asked for help to create a stop condition, while a For Loop is running. I was given many ideas and selected the one that used local variables. It works well however, if I am in the "Test in progress" state, in the first For Loop, and the "Stop" button is selected from the front panel, when it stops the Vi, it sends the value "5" to the second For Loop before going to the "End" state, which puts it to "0", then stops the Vi. What this Vi is doing is feeding 0-200VDC signal to an eddy current sensor, then it feeds 200-0VDC going the other direction. I have tried sequencing, putting in timers and a few other goofy things but I can not get the Vi to stop in the first For Loop, without the Vi performing the initial "5" to the second For Loop. Someone had mentioned using an event handler, in my previous post. I practiced for quite some time, trying to understand how to use an event handler but am not much the wiser. Any and all input would be greatly appreciated.

altenbach wrote:
ceilingwalker wrote:
You are autoindexing way too many thing between the two FOR loops I was doing this to create a data dependency, at least that was my thought process behind it. As far as the physical channels and VISA refnums, I did it this way so I didn't create more controls for the front panel. Being my first project, I am very certain my logic is flawed, this is why I like posting here and getting feedback from
You have many visa sessions that (hopefully) never change during the execution of the loops, so why woold you turn them into an array of 11 identical elements just to autoidex them out again at the next loop. Change the tunnels to no autoindexing and things would look cleaner. Why are these session controls inside the loop? Are you expect them to be changeable during loop execution or would that screw up the results?
Wounld't it be easier to simply create an up&down ramp once and use a single FOR loop, autoindexing on the ramp? You have way too much duplicate code!!!
If you don't want the second loop to run when the first one is ended prematurely with the stop button, put it in a case structure I tried a Case structure for the second For Loop. I couldn't find a way to change conditions that didn't affect the Vi's overall performance.
Then show us what you tried! That should be trivial to implement. Why would a case structure affect performance? Makes no sense!
Why would a case structure affect performance? Makes no sense! I used a boolean operator to change the state. When I used a false, it worked for that problem but shut down my Vi before the second For Loop.
Wounld't it be easier to simply create an up&down ramp once and use a single FOR loop, autoindexing on the ramp? You have way too much duplicate code!!! I tried using one For Loop to begin with but because I had to ramp up, then ramp down, I couldn't figure out how to use just one. I needed an Add function for the ramp up and a Subtract function for the ramp down.
Why are these session controls inside the loop? Are you expect them to be changeable during loop execution or would that screw up the results? No Sir, the values are not changed during operation. I did this because I wanted it to display the data on the front panel, during operation of the Vi. For display only.

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I'm a new hand to labview, and I'm using labviw 7.1, NOT 8.x. I'm trying to do a measurement, in which the flow would look like the attached file (I have stipped all hardware related components to make it easy to read). My questions are:
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Attachments:
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hwm wrote:
2. When it is running, I click on stop button, why it won't stop?
The stop button is read outside of the inner while loops. So the inner while loops will continue to run until their stop conditions are met.
hwm wrote:
1. In Loop 3, when the comparison (x>20.85) is true, Loop1, Loop2 and Loop3 are stopped, why it won't quit the while loop (I have wired it to while loop stop)?
It seemed to me like it would, but sometimes it seemed like I had to set change the numeric value one more time before it would. You have a very odd structure there by placing the event structre inside the while loop with the other loops. I think you may be running into issues where events are getting queued up in the event structure, or race conditions between when the event structure might execute relative to the other loops. It is all very odd and difficult to predict all the ways these structures might interact and relative timing. Usually event structures would belong in their own parallel while loop. I think you need to rethink exactly what you are trying to do here. It probably isn't event necessary to use the stop timed structure functions. A local variable or a notified to pass the "Stop status" from loop 3 to the other loops (or the separate event structure loop to the other 3) would probably be better.

How to stop a "for" loop

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