Avoid race Conditions, using Variables of network w / RT

SYSTEM:
I use a cRIO system connected to a host via ethernet PC.
One of the parts of my system of cRIO with that I'm having a problem using CAN.

BACKGROUND:
FPGA waits for a reading, and when a message is received (U8 table format), he shoves every element in a target-to-Host U8 FIFO.
RT sees the message in the FIFO, it collects and it integrates an array 2D U8 (in the case where more than one message is received) and adds to a growing range of U8 2D.

PROBLEM:
Originally, I was misleading this table 2D to the host computer via a Variable network and display on the façade of the host machine. This works, except over time, this table 2D-U8 gets huge-especially if I use an echo.

Ultimately, I want the host to display entire history, but including the RT rewrite this entire variable each time and send them over the network it slows down.

FAILED ATTEMPTS:
I expect to change to a queue, but apparently it is accessible by other elements in the host (in this case, the Module LabVIEW RT.)

Writing an empty array in the network Variable after reading it obviously causes problems of condition Whitneys.

QUESTION:
Any suggestions on how to transmit these data to the host without losing data?

Is it possible to have something similar to a queue or FIFO on the network?

Thank you

~ Andrew

(There are two routes that you might go: 1) for broadcast continues to the host network streams gives the effect of the queue on the network but it requires something to transmitted data namely hard if you need connect/disconnect your host. (2) stick with static variables, but your RT code will be expected to handle the buffer. For example, you can set up a circular buffer of the last samples n that is written to the variable. Based on what you say, I'd go with 2 though, so he can give that a complete history is difficult.

Tags: NI Software

Similar Questions

How to avoid race conditions?

Hi, ive done Labview for a dozen years. And this is the first time ive met or its made my code. I have a lot of code that runs at the same time. And for years, good practice in order to avoid it never repeated?

Stu

I spent an entire course on the race conditions and concurency in higher education, and to avoid race conditions, understand why they occur.

Race conditions occur when several parallel processes or competitor access to a shared resource. Furthurmore, this is especially annoying when 2 or more threads or processes are seen change a resource. Then all first identify candidates for this when the architecture of your application. If you only have one thread, you must be sure (although it gets more blurry since it has the ability to run in parallel). Is it then all variables/resources that are needed in the 2 wires at the same time, and if so, you change the value in one or more threads. If so, you have to deal with synchronization.

Traditionally, you talk semaphors, locks and mutexes. All methods of locking critical code (ie the resources that are sources of possible race condition).

BUT WE ARE IN LABVIEW. LabVIEW has a simple method which could be easier to use, functional overall.

screws that are not marked for reentrancy is essentially a great way for the protection of data and your locking critacal sections. That only one thread can access and or modify the data stored in the vi, at the same time. Other threads will be blocked and wait on the resource.

It was much more difficult to implement in c.

Anyway the way you deal with racing conditions is to

1. identify critical sections and resources which can cause race conditions (usually shared resources with multiple writers)

2 lock the resource until cooked (avoid deadlocks by per se - but that is another debate)

Unlike traditional bugs, bugs competitor are more random and very difficult to reproduce/test for so you will have to deal with them in the design of architecture.

Locking access to Global Variables to avoid race conditions?

Hi all

I'm developing an application where 'control' Subvi accesses a Subvi 'action '. The Subvi action is actually limited by a number of different high-level subVIs to I really need to use globals.

I wrote the next part of the code and was struck that it could lead to a race condition. Essentially my Subvi control runs two loops in parallel. Each loop reads the global increments a different value in each of them, wait a while and then returns to its previous value.

I wrote this piece of code to demo what I mean. The table of waveform takes the place of the Subvi 'action '. Running this code resulted in a competitive situation (one of the values goes from 0 to 5 range to the range of 5-10) after its loading into memory using a second time usually allows it to operate for a long time.

I modified the VI to exaggerate the effect of the condition of competition for demonstration. I've also implemented a solution using a local variable to stop the globals accessed at the same time. However, it is far more elegent and I don't think it will work for more than two loops. Finally, I need to use three loops.

I have attached my demo/exaggerated solution. If you can suggest a better way to solve this problem, I would be very grateful.

Thank you

Dave

DeltaJ wrote:

I'm just out of the laboratory for a bit of fresh air--after watching this problem for hours - and he hit me. If I write access to my Globals in a Subvi - what I can do - and do the reentrant VI will not program only be able to access the globals in the order and avoid the condtion race in this way?

A reentrant VI uses its own separate for each instance memory space, so it means it can be called in parallel with another instance. In other words, it gives you just the same situation as what you currently have.

Or do you mean I can access to the global queue - I'm able to do it without a huge rewrite!

No, I wasn't talking about the queue access globally. I was talking to store the data in a queue.

Encapsulation of the value in a Subvi refresh, it's what you would do with a motor of Action. Note that you want an 'update' action so the write occurs inside the engine of Action VI. This will give you as close to an atomic operation that you can get.

Update only one item in the cluster while avoiding race conditions

I have a cluster called "Inputs" that has a bunch of data within all kinds of data types.

I have several loops in the code I want each of them to update a specific element within the cluster.

I have to get the cluster use this Bundle by name on the specific item and then rewrite in the cluster.

This way I have racing conditions because two loops can 'be' the cluster at the same time, but when they rewrite a wiil overwrites the other.

How can I avoid these race conditions?

I am familiar with Globals functional if it is connected to a possible solution (I have the feeling that it is..)

Thank you!

I still think that my suggestion to use the value of data references would be easier. The structure of the International preliminary examination will block the concurrent access to the data cluster: no race condition.

The last loop (option) shows how to query the State of the heap of data.

How can I get the CompactRIO 9074 to communicate with TPC-2206 using variables of network?

Hello
I have trouble getting the Rio Compact to connect with my touch screen. The goal is to have the CRIO read in data values, update as network variables and then send them to the touch screen where they are displayed. I used the Distributed System Manager to verify that the CRIO updates the network variables. I also created alias for the CRIO and PTC files to ensure they have the necessary IP addresses included. I am able to PING the CRIO of the touch screen, so I don't think it's a problem of network connection. This leads me to believe that the CRIO works properly, hosts the variable library and broadcast on the network, but for some reason the touch panel knows not how to retrieve variables. I have also noticed that when you change the "Properties" of the executable of touch panel, if the "Shared Variable deployment" section contains a box to checked then result is a mistake trying to "run" the executable file on the touchscreen, however if the box is left then repressed the executable runs without error. He still does not update the values of the CRIO however.
I don't know what else to try, any help/ideas would be really appreciated!
Thank you
-Lindsey

Equipment I use:
PTC 2206 touch (Windows XP Embedded)
CompactRIO 9074
LabVIEW 2010

Problem solved, thank you for your help!

For anyone else having this problem in the future:

As stated previously, the TPC2206 (touch screen) with Windows XP Embedded does not come with the support of shared variable engine installed. To resolve this problem, I went to NI.com, typed in "LabVIEW Run-Time Engine 2010" in the search box (if you are using another version of LabVIEW, then find accordingly) and clicked on the second link "LabVIEW Run - Time Engine 2010 - (32-bit Standard RTE) - Windows 7/7 64 bit/Server 2003 R2 (32-bit) / XP/Vista/Vista x 64/Server 2008 R2 (64-bit)" "» downloaded, place the file on a USB key (my touch screen is not connected to the internet), connected to the touchscreen, installed the file and restarted the touch screen.

What is the use of the network user and 4 asm disks in oracle rac 11 g 2?
Friends,

Separate server DNS:
bones of DNS: OEL 5.7

RAC1
OS: OEL 5.7 64bits
DB: 11.2.0.3 64-bit

Rac2
OS: OEL 5.7 64bits
DB: 11.2.0.3 64-bit

4 disks are shared between rac1 and rac2... and I configured using the oracleasm successfully...
above all 3 nodes are in virtual box 4.1.1.8

I'm installing oracle 11 g 2 cars in the configuration node above the 2.

I'm partially by following this link http://www.oracle-base.com/articles/11g/oracle-db-11gr2-rac-installation-on-oracle-linux-6-using-virtualbox.php
up to

runcluvfy.sh stage pre - crsinst - n rac1, rac2-verbose

is success... now I got a question... What is the use of the network user?
because after checking above... it installs through the user oracle... of the complete notes he has no use for the user to this network...
can someone tell me the use of the network user?

of course I ask only this person who wrote this installation... to get a quick answer, I ask you here...
I hope that someone will clarify my doubt to the success of this installation in a few hours...

I have already created users and groups below... in each node

Node1
```
[root@rac1 ~]# id oracle
uid=200(oracle) gid=500(oinstall) groups=500(oinstall),505(dba),502(asmdba),504(oper)
[root@rac1 ~]# id grid
uid=201(grid) gid=500(oinstall) groups=500(oinstall),501(asmadmin),502(asmdba),503(asmoper)
[root@rac1 ~]# 
```
```
[root@rac2 ~]# id oracle
uid=200(oracle) gid=500(oinstall) groups=500(oinstall),505(dba),502(asmdba),504(oper)
[root@rac2 ~]# id grid
uid=201(grid) gid=500(oinstall) groups=500(oinstall),501(asmadmin),502(asmdba),503(asmoper)
[root@rac2 ~]# 
```
and on the shared drive... He created 4 disks... I saw in the paper... 3 is normal and 5 for the top... but 4?

Thank you and best regards,
OraDB wrote:
Thanks for the link...
So how about storage shared... it's 4 disc are necessary for normal redundancy? or 3 is sufficient according to the documentation.

Thank you

Before you answer, you must reflect on what is to say NORMAL redundancy? As long as you can keep your total drive less than the size of a full disk, you'll be fine... If it becomes higher than that and you have a failure, you now will have a major problem trying to recover a defective unit. The documentation is for a minimum configuration, however, you generally have to be smarter than the documentation. You must configure really redundant N + 1. Whatever size you need, configure always a plus. So, if you need the space of 2 devices, set up 3. If you need the space of 3, Setup 4. And if you start using the appliance + 1, add another. Always keep N + 1.

In what concerns the grid + oracle user in most of the stores of this level of "termination" is total nonsense. Unless you have a DBA who makes GI and a DBA who data bases etc... It's a moot point. I'd say it's a complete waste of time and energy in all cases. I have it configured with grid + oracle user and I configured with just the oracle user. The multi-user method can sometimes become confused when you try to find something like the other user. YMMV.

Shared Variable (published network) communication

Hi all

All day I was hitting my head with variable communication shared between RT host and the host computer:

I basically tried to pass an array of the host of the CR to the host computer. For this I used a published shared variable of network type Array U64. I used this link to help me understand usign shared variable communication

http://www.ni.com/white-paper/4679/en ...

I also activated RT FIFO. Now in the city that link the information given on the use of FIFO of the single element or Multi element FIFO

"By enabling real-time FIFO, you can choose between two types of compatible FIFO slightly different variables: the only element and the buffer insurance program. A distinction between these two types of buffers, it's that the only element FIFO reports no warnings on positive or negative overflow conditions. A second distinction is the value returned by LabVIEW when several readers read an empty buffer. Several readers the only element FIFO receive the same value, and the only element FIFO returns the same value until a writer writes back to this variable. Several readers of a FIFO empty array each get the last value that they read from the buffer or the default value for the data type of the variable, if they have not read before variable. "

I had read the content above a 100 times, but still I'm not able to get a clear picture of the difference and when to use which option. So I decided to take the text and tried to try something for me.

I had a loop in the reception of RT who writes arrays of 3 different elements in the 'network published variable shared'. Now when I use the option of multi element with "number of berries as - 2" I am able to read tables separates one by one in the host computer (as you can read a queue in general).

Now when I used the option of single element for the RT FIFO with 1 UN editable table option, only the last table written in the 'shared variable published network' is read in the host computer.

This seems absolutely ridiculous as if this is the case, then what is the purpose of creating the "buffer". For testing purposes, I had put the buffer in 5 tables.

In fact, I have only a single author (written in loop in the reception of RT) and a reader (new looping in the host computer). So I don't know even if I need option of the RT FIFO for the published network shared variable.

I'm sorry for the long message but I've reached the limits of going around in circles waiting to type somewhere

I know I made a mistake stupid somewher or it miss me probably a clear simple trick but don't know what it is...

I request some clarification... In fact I posted a little while earlier today so ... bind - http://forums.ni.com/t5/LabVIEW/RT-Host-to-Host-computer-communication/td-p/2348130 )

any help would be appreciated

See you soon

Hello

I think that the difference between these two types is clearer by using LabVIEW:

Activation of the FIFO in real-time

You can activate the FIFO in real-time to a shared variable since the page FIFO in real-time of the properties of the shared Variable dialog box. Check the box Enable the FIFO in real-time in a deterministic way share data using the one element or several elements FIFO.

Single element FIFO

One FIFO shares the most recent value of the data. The shared variable overrides the value of data when it receives a new data value. Use this option when you need only the most recent value. Configure the size of the elements of the array or the size of the waveform for the FIFO buffer, if you select a table or a waveform data type.

Several elements FIFO

A FIFO multi-elements implements buffer the values shared by the shared variable. You can configure the size and elements of the buffer FIFO to match the parameters of buffering to use of the Variable page, or you can configure a custom size for the FIFO and FIFO elements.

Note For single item both multi-elements FIFOs, if the variable contains data table or a waveform, you must configure the size of the elements FIFO equals the size of the data to share. If the network buffer both the RT FIFO are enabled, the network buffer should be at least as big as one of the elements of FIFO. Sharing data smaller or larger that the specified length results in a memory allocation which affects determinism.

Note Waveforms contain variant of varying size that are not compatible with real-time FIFO. Therefore, if you enable the FIFO in real-time on a shared variable that contains the waveform data, the item variant waveform data does not transfer.

http://zone.NI.com/reference/en-XX/help/370622K-01/lvrtconcepts/rt_projectvariable/#Single_Element_F...

' Hope this helps

Aurélie

Autofocus TextField when the user presses the keys (and possible race condition)

Someone tried to implement a device by which a TextField (or text box, I guess) automatically gets the focus when a user starts to type anything? It is very convenient to have something, at least with a phone model Qwerty, in certain situations. (A use case is where a list that is too long for the useful shortcuts, but the TextField object is used to implement a filtering mechanism that can reduce the data set to a reasonable size, and the user can then scroll just to find a target element).

I've set up something using a KeyListener (calling requestFocus() for the TextField object) attached to the container Page, but there are problems with it.

It's a question that the first keystroke does not render in the TextField object, since it has not a focus when the key was first struck.

To solve that you can enter the key (event.unicode) and that insert into the TextField object, and then the following keys go on the field you want... but there is also a problem with that.

If you type two or three buttons in quick succession, probably less than 50ms between them, you can see that even if the KeyListener gets each of them, the TextField object receives the second or, sometimes, the third, even if you can check that by the time second keyPressed/output signal arrives in your earpiece the TextField claims to have developed (TextField.focused is true).

This seems like a bug, but maybe it's just a case of corner cascading who is inevitable, given its design... I'm not sure.

If anyone can reproduce it, thanks for posting here. I'll do a test case to prove and will report it as a bug if you do.

If anyone has a reliable and quality approach, please post here too! :-)

P.S. for a good laugh, a code here that I did for my particular case, which seeks to avoid the race condition. As you can see, this is a great hack, but it works 100% reliable for me so far with a fairly comprehensive test (including the tests with the movement of the cursor, copy/paste, etc.). It's too complicated to analyze and ensure that it is really robust, however, but feel free to use... If you care enough. ;-) http://pastebin.com/r2VUtPJC

Have you tried setting the primaryKeyTarget it's inputRoute?

https://developer.BlackBerry.com/native/reference/Cascades/bb__cascades__inputrouteproperties.html

Has been added to the 10.1, which should do what you want.

You can also achieve the same messing around with pre FocusPolicy 10.1, but it is much simpler.

Having a very bad Friday afternoon, no idea how I can eliminate a possible race condition? I have a working script intermittently :(

I have a script that seems to work intermittently, usually it fails on the line of characters 1 128 (in bold below) I think that the VC will not return with information and therefore the script fails on the capture...
on the other
{
Write-Host "space is insufficient on the target data store. Please increase the space to continue.
Write-Output "space is insufficient on the target data store. Please increase the space to continue"> > $logfile
Write-Host "Exiting with code 1.
Write-Output "exit with code 1" > > $logfile
Send-MailMessage-to $From-$To-CC $Cc - subject $Subject '
-Body $BodyFailure1 - SmtpServer $SMTPServer - port $SMTPPort
Output 1
The architect suggested it might be a race condition, can someone with a lot more experience than me (it's pretty anyone) suggests an alteration that may well solve this problem? I guess I could put breaks in but I'm not 100% where would be the best place to do so or if maybe it's the mickey mouse method?
Error
# ==============================================================================================
# NAME: CloneVMs
#
# AUTHOR: Luc
# DATE: 10/09/2015
#
# COMMENT: Creates a clone/backup of virtual machines described in the text and names using the
# past param. Virtual MACHINE will be appointed in accordance with the following VM1-12345678 example
#
#
#
# * Software dependencies: *.
# - Microsoft PowerShell *.
# - VMWare PowerCLI *.
# ==============================================================================================
# Parameters
# ==============================================================================================
# Below is provided by Control-M parameter refers to the prefix point cycle and restoration,
# the date can be added automatically, however, this feature has been disabled.
Param ([string] $CYRPYYMMDD)
# ==============================================================================================
# Functions
# ==============================================================================================
#Function for you to check if a command is responsible
Function Check-Command ($cmdname)
{
return [bool] (Get-Command - Name $cmdname - ErrorAction SilentlyContinue)
}
# ==============================================================================================
# Varibles
# ==============================================================================================
# Add the snap of vmware for powershell
# Add - PSSnapin VMware.VimAutomation.Core
# Add the snap of vmware for powershell (keeps see you error messages)
If (control "Connect-VIServer")
{
Write-Host "already automation tool for".
}
on the other
{
#If not already loaded load the snap
Write-Host "loading automation tools.
Add-PSSnapin VMware.VimAutomation.Core
}
backup of # = true adds date; false creates a clone with the same name.
$backup = 'True '.
debugging of #-true: clones not vm. FALSE will clone the virtual machine.
$debug = "FALSE".
# Target Datastore
$targetdatastore = "LUN9_BASIC_MATADM_ONLY".
Check the #Refers the percentage of free space for space DS
$freePerc = 10
# Target location - folder existing in vcenter structure, where the clones will be held
$targetlocation = "DMAT DNT for Cycles compatibleM BackUp.
# Set a date
$datestart = (get-date - uformat %Y %m %d)
# Name a log file to record the results.
$logfile = $datestart + "_VMClones_bulk.txt".
#
Write-output "new journal ($datestart) - ($logfile)" > > $logfile
# Gets the list of virtual machines from the file associated with this script
$VmFileList = get-Content VmsToCloneList.list | Select-Object - jump 3
#
$ds = get-Datastore-name $targetdatastore
#Email varibles
$From = «»
$To = «»
$Cc = «»
#$Attachment = "C:\temp\Some random file.txt".
$Subject = «!» DMAT TEST createRP TEST! »
$BodySuccess = "A DMAT VM has correctly saved to the specified folder of destination organizational data store and inventory in vSphere"
$BodyFailure1 = "the combined use of VMDK put in service of the virtual machine is greater than the capacity of the destination database or the datstore does not exist, coming out with code 1"
$BodyFailure2 = "there is not enough space on the target data store, increase the space to continue, exit with code 1"
$BodyFailure3 = "a virtual machine with the specified name is not found maybe it does not exist? Exit with code 1 "
$SMTPServer = «»
$SMTPPort = "25".
# Connect
$Creds = get-VICredentialStoreItem-Host 127.0.0.1 - folder C:\Users\matadm\PS_ITC_BAS.xml
SE connect-VIServer 127.0.0.1-$ username-password Creds.User $Creds.Password
# Gets the total ProvisionedSpaceGB of VM for all s VM in the list.
# Ensures whitespace and hashes are effectively ignored
# create a clean list that calculates / creates the variable required for the validation check 1
$vmCleanedList = New-Object system. Collections.ArrayList
# Loop through our VM file list and own is in place, check for incorrectly specified VM
ForEach ($vmname to $VmFileList)
{
If ([string]: IsNullOrWhiteSpace ($vmname) - or $vmname.) StartsWith("#"))
{
writing-host("Invalid machine name-$vmname")
}
on the other
{
#Should trim vmname to ensure that we have no spaces before or the end
$vm = get - VM $vmname
$vmCleanedList.Add ($vmname)
$TotalRequiredGB += $vm. ProvisionedSpaceGB
}
Write-Host "Total needed = $TotalRequiredGB.
}
# ==============================================================================================
# Validation checks before launching the clone script
# ==============================================================================================
# Updates the prior to storage data store information.
$ds. ExtensionData.RefreshDatastoreStorageInfo)
# Validation check 1, check if the combined usage of VMDK put into service of the virtual machine is greater than the capacity of the destination database?
If (($ds.)) FreeSpaceGB - gt $TotalRequiredGB))
{
Write-Host 'continue with your script.
}
on the other
{
Write-Host "space is insufficient on the target data store. Please increase the space to continue.
Write-Output "space is insufficient on the target data store. Please increase the space to continue"> > $logfile
Write-Host "Exiting with code 1.
Write-Output "exit with code 1" > > $logfile
Send-MailMessage-to $From-$To-CC $Cc - subject $Subject '
-Body $BodyFailure1 - SmtpServer $SMTPServer - port $SMTPPort
Output 1
}
$ds = get-Datastore-name $targetdatastore
# 2 validation control, you have X % datatstorespace free?
If ((($ds.)) FreeSpaceGB / $ds. CapacityGB) * 100)-ge $freePerc)
{
Write-Host 'continue with your script.
}
on the other
{
Write-Host "there is less than X % of free space on the data store. Please increase the space to continue.
Write-Output "there less than X % of free space on the data store. Please increase the space to continue"> > $logfile
Write-Host "Exiting with code 2.
Write-Output 'output with code 2' > > $logfile
Send-MailMessage-to $From-$To-CC $Cc - subject $Subject '
-Body $BodyFailure2 - SmtpServer $SMTPServer - port $SMTPPort
Output 2
}
#Hack + of the duplication of efforts
#$VmListFile = get-Content VmsToCloneList.list | Select-Object - jump 3
ForEach ($vmname to $vmCleanedList)
{
# The virtual computer object
$vm = get-VM-name $vmname
# Target host - use the same host as the current VM (it's faster than the cloning on hosts).
$targethost = $vm.vmhost.name
# Target VM name - name if the BACKUP is FALSE
$vmtarget = $vmname
#
$datastore = get-datastore $targetdatastore - vmhost $targethost
# ==============================================================================================
# Start the real clone script
# ==============================================================================================
If ($vm - no $null)
{
Write-Host "a virtual machine named $VM exists. From clone "
Write-output "a virtual machine named $VM exists. From clone"> > $logfile
}
on the other
{
Write-Host "a virtual machine with the specified name is not found maybe it does not exist?
Write-Output "a virtual machine with the specified name is not found there is perhaps no?" > > $logfile
Write-Host "Exiting with code 3.
Write-Output "output with code 3" > > $logfile
Send-MailMessage-to $From-$To-CC $Cc - subject $Subject '
-Body $BodyFailure3 - SmtpServer $SMTPServer - port $SMTPPort
exit 3
}
If ($backup - eq "TRUE")
{
# Clone the virtual machine for backup_vmname_todaysdate
$vmtarget = $vmtarget + '-' + $CYRPYYMMDD #+ '-' + $datestart
}
beautiful colors # if you look at the script runs
write-host - foregroundcolor green 'cloning $vm to $vmtarget.
Write-output - foregroundcolor green 'Cloning $vm to $vmtarget' > > $logfile
new-vm-name $vmtarget - vm $vm vmhost - $targethost - $datastore - $targetlocation location data store - slim DiskStorageFormat
Send-MailMessage-to $From-$To-CC $Cc - subject $Subject '
-Body $BodySuccess - SmtpServer $SMTPServer - port $SMTPPort
}
Write-Host "complete."
Exit 0
# COMPLETED

Have you ever tried to test if $ds-eq $null before you call the RefreshDatastoreStorageInfo method?

In the error message, it looks like $ds contains $null, no idea why when the data store 'LUN9_BASIC_MATADM_ONLY' exists in the environment in which you are conencted.

In fact, you could test immediately after the Get-data store.

Ah, but wait, you seem to be doing the first Get-Datastore (there are two in the script, but I guess you know) before the connect-VIServer, it won't work.

Unless I'm missing something here

read into the buffer variable published network shared

I use a shared variable that is published in the network buffer to write data to an RT target and read data buffered by the host application.

I followed a different behavior regarding data buffering using Variable vs reading read the shared Variable node.

There is no problem the shared variable node read but using the results of reading variable function of loss of data, such as access without alkaline reserve. I can read only some of my data values.

I see no difference in access in the buffer in LV2009 help.

against

Any help is appreciated

Christian

Hi Christian,

The behavior you describe is because the client side PSP buffering is not applied to the Variable API shared in LabVIEW 2009. It was a design decision, but eventually, we hope to include this feature in a future version of LabVIEW. This bug here as you pointed out is the lack of documentation for it. Corrective Action Request # 202159 has been filed for this issue.

Let me know if you need assistance working around this issue.

See you soon,.

Using variables to get the answers to the questions of fill-in-the-White

Hello
Fill-in-the-blank questions, to provide answers. I want to provide these in the form of variables (user-created), rather than in the form of fixed strings (so, as $$ var1$ $ and not as 'Rabbit'). I could not get this to work. The variable input function is available (in the properties panel), but it does not in fact (i.e. even if you select a variable to be entered, it is not actually automatically registered).
Is there a way around the problem?
1. NB containing the same question for text entry boxes (rather than fill-in-the-blank questions). If I could get this works for text entry boxes, I'd use questions these rather than fill-in-the-white.
2. a peut use variables for the answers to the multiple-choice questions. So I hope I can make it work for fill-in-the-blank questions as well.
Thank you in advance. Marvin DuBois

That would be my suggestion. I don't have a blog, but using BER of for this kind of questions me as well. And unlike the widget/interaction, that I've mentioned before, BER is an interactive object, which means it can be validated and that there may be a score attached to it. But, it will not help you, since you have to add the correct answers in the same way as for a drop-down list in the issue of the FIB (they are the sorts of TEB). And it is this list that does not enter a variable rather than a fixed sequence of characters.

This means that you are into stocks advanced, identical to that of my blog posts with the widget/interaction.

Have a work around (after all I'm the work around Queen) having intercourse, if you don't check that BER, described here:

http://blog.lilybiri.com/report-custom-questions-part-2

The idea is to use another interactive object that can have a score. Actually, I use two instances of the same object: a score of 0 and one with score of X and show the right according to the conditional action.

However if you want to have multiple TEB on the same blade, which must be verified with the same tip action, you will need either the mastery of InfoSemantics (only for output SWF) widget or Javascript.

Lilybiri

Using variables & shares advanced Captivate 6

Hello
I'm working on a project with only 2 slides. The second slide has a folder with 8 tabs. When the user clicks on the tab for information tab appears and a check mark appears on the tab to let them know the tab has been seen.
I used variables and standard actions to make the correct text and completion work coches (nothing wrong with that)
After that the user has seen all the tabs I didn't it must seem strange that nothing else happens or confuse the rest of the course (British Colombia, there is no quiz or interaction - I just need them to read the info). I created a conditional action to 'Thank you for taking this course' appears and a play button for learners to understand the course is completed.
The conditional action indicates whether each variable is equal to 1 (because variables start at 0 and change in 1 click on) it shows the message of thanks and the BACK button (I disabled the buttons of visibility on them) and condtional action added to the slide itself.
I don't know why it does not work! I even displays the variables on the screen to ensure that they evolve all at 1 when you click on and they are, but the text button and replay thanks are not displayed. What I am doing wrong? I'm captivate in version 6.0.1.240.
Thank you

That was my thought as well. Because you appear not to leave the slide until all tabs have clicked, it would only seem to be click events available to trigger you actions.

If I had to create this interaction, I would have used Actions conditional Advanced executed by clicking on each tab and not just the Standard Actions. The first part of the CAA would be to show the relevant tab and hide all others, and then the next part of the CAA would be to check if all variables have been set to 1.

Use variables to display object in Captivate 4

I would like to be able to display a check mark next to title on the table of contents page once the user displays the last page in the section. Is it possible that I can do this, and where can I find the code?
Thank you

You can use variables to show/hide elements on a page.

First add custom variables to represent the State of completion of each section. Something like sectionOneCompleted = 0, sectionTwoCompleted = 0, etc..

Then add assignments for each of your variables at the end of each section. For example, you could define "on slide enter ' use 'assign' and give variable sectionOneCompleted set to 1.

Then in your table of contents you can show/hide the elements on the page depending on the value of your new user-defined variables.

1. go in the slide properties

2. under ' Navigation: on the slide, type ' select 'execute the Advanced Action '.

3. click on the... button next to 'the Action '.

4. under change/create an Action, select 'create '.

5. the action of giving a name such as ShowHideThingie

6. in the area of large text, double-click the text of 'Statement add' light gray. Gray 'add a statement' become a red "declaration". Double-click it again.

7. Select 'condition' in the menu drop-down

8. click 'Select a variable' and choose your variable defined by the user (in this case, "sectionOneCompleted")

9. choose "is equal to" and then enter a value of 1

10. then, you must specify what to do if the value is 1. Under 'start' double-click 'Add education '. Select 'action Standard' in the menu dropdown.

11. Select 'View', then select the name of the object that you want to display (each item placed on the blade has a unique ID)

12. now, we need to specify what happens if the value is NOT 1. Under 'otherwise... start', double click 'Add education '. Select 'action Standard' in the menu dropdown.

13. Select 'Hide', and then select the name of the object that you are showing to step 12.

14. click "Save" and close the window of the Actions dialogue box.

This should be it!

Note: I have not tested these steps carefully (written very quickly), but I hope you get the idea and can get out of here.

-philip

Using variables in sql, unexpected results queries coldfusion.
I came across a somewhat embarrassing problem. I'd be interested to see if the following works for other people:

< cfset sql_var "'something', 'something'" is >
< = 'test' datasource cfquery name = "db" >
Select id from table where unnom (#sql_var #)
< / cfquery >

Because it is that which produces a sql error - coldfusion tries to run the query in the form

Select id from table where unnom in ("something", "thing")

It is with the double quotes around each of the strings, even if it has not been specified in the sql_var variable.

So I tried this:

< cfset sql_var = "something","something else" > ".
< = 'test' datasource cfquery name = "db" >
Select id from table where unnom in (' #sql_var # ')
< / cfquery >

Where the sql_var variable has that single quotes between the two strings, and I added the quotes to the select statement. It produces no error, but no results either. Running sql is

Select id from table where unnom ('something', 'something')

Which is exactly as it should. I copy and paste the exact same query into the database and it produces results - but when coldfusion runs the query it doesn't. Executes the query with without product quotes a sql error, which is what I expect wopuld.

Which leaves me somewhat at a loss. Anyone got any ideas?

Running CF 6.1 (I think) using a database MySQL, if that makes a difference to anything.

It is with the double quotes around each of the strings, even if it has not been specified in the sql_var variable.

In Coldfusion, 'something' and 'something' are the same thing. You should expect that Coldfusion could pass from one to the other.

Where the sql_var variable has that single quotes between the two strings, and I added the quotes to the select statement. It produces no error, but no results either. Running sql is
Select id from table where unnom ('something', 'something')

I don't think that it is running the query. Before moving on to the string, "something", "something else" to the Coldfusion query will automatically escape the single quotes on either side of the comma. This is the default behavior. The resulting query is

Select id from table where unnom in (' something "," something else "")

To avoid these complications, use the PreserveSingleQuotes() function. Therefore,.

Select id from table where unnom in (#preservesinglequotes (sql_var) #)

iOS 10.0.1 "not allowed to use the restricted network port.

I just upgraded my iPad Mini iOS 10.0.1. He is now running Safari 10. I tried to visit an internal/private IP on port 4190 using HTTP. I get an error that says:

Safari cannot open the page.

The error was: "not allowed to use the restricted network port.

On iOS 9.3 using Safari 9, the same URL opens fine without this error.

Do not know what has changed since iOS to iOS 10.0.1, 9.3 but I'm unable to visit a web site that I have visited before.

I know that WebKit maintains a list of ports that you cannot go (e.g. 6666), 4190 is not a restricted port AFAIK. I don't know why I get this error message.

It seems I was looking at the wrong source code.

I finally got a clue where to look after visiting the page Web Safari Technology Preview 13.

https://trac.WebKit.org/browser/releases/Apple/Safari%20Technology%20Preview%201 3/WebCore/platform/URL.cpp

It seems port got 4190 recently added to the list of blockedPortList

2306	2049, / / NFS
220V	3659, / / apple-sasl / PasswordServer [addition of Apple]
2308	4045, / / lockd
2309	4190, / / ManageSieve [Apple adding]
2310	6000, / / X 11
2311	6665, / / alternate IRC [addition of Apple]
2312	6666, / / alternate IRC [addition of Apple]
2313	6667, / / standard IRC [addition of Apple]
2314	6668, / / alternate IRC [addition of Apple]
2315	6669, / / alternate IRC [addition of Apple]
2316	invalidPortNumber, / / used to block all the invalid port numbers
2317	};
2318	const unsigned short * const blockedPortListEnd = blockedPortList + * _ARRAY_LENGTH (blockedPortList);

Avoid race Conditions, using Variables of network w / RT

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