"scan from string" to timestamp doesn't work for 18:00:00 (6PM)

I just found a strange issue in LabVIEW. I hope I'm doing something silly, but I just may have found an unusual bug.
run the snippet below with the following for the input string: 03:00:00,18:00:00,17:00:00
Time converts fine for just about any other time EXCEPT 18:00:00 (6 PM) for which it is returned as 00:00:00 (midnight). If you even add a second to it (18:00:01) you get back the expected result.
Here's hoping I'm not loosing my mind
Matt Holt
Certified LabVIEW Architect
Solved!
Go to Solution.
Attachments:
TimeParseBug.vi ‏11 KB

As annoying as it may seem, this exact scenario is an abuse of the timestamp. A timestamp is meant to be used for absolute times. And that includes a date. As Ravens Fan already pointed out, the 0 seconds since January 1, 1904 GMT is used in all timestamp display routines to mean the canonical invalid timestamp and hence the timestamp control displays the default string indicating the actual date/time format rather than a specific date/time.
If you need an absolute timestamp, for instance because you do want to have a local time indication, although the date is not relevant, adding an offset of 86400 to all values would fix it once and for all. Now the timezone offset can't cause the timestamp to reach 0 ever, even if you reside west of GMT, and it will be fine (until you start to do timestamp arithmetic that involves subtraction of relative timespans, then you would have to make the offset big enough that this will never get an issue). The current date would serve as a nice offset for that, which would be MattH's last suggestion. Nice to see that the Scan from String routine actually does use the passed in timestamp as default value and only replaces the values it is configured to parse.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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Scan from string to timestamp not working

Hi,
I have a problem with the "Scan from string".
The format string "%<%H:%M:%S%ds%bs%y>T"
works for the input string "11:12:1322sJans2010"
but doesn't work for the input string "11:12:1322sFebs2010"
The only difference is the month (Jan or Feb). I got know idea why!
Could anyone help me?
Regards,
Marcelo
Attachments:
dateString.vi ‏6 KB
date.PNG ‏5 KB

Both work for me in LabVIEW 2009; perhaps this was a bug in 8.6 that's been fixed?
Also, is it possible your operating system is running a different language, in which Jan is the abbreviated form of January but February is something else?

Strange "Scan From String" to Timestamp Error

hi,
i am trying to parse my time-string into a Time Stamp with "Scan From String" but i get some strange Error(1).
The Code:
The Error:
can anyone confirm? do i have an error in my parser-string?
is it possibly related to this Bug
461196
Scan From String VI returns Error 1 with "%t" as the format string input
http://www.ni.com/product-documentation/52151/en/
that should be fixed?
my labview version is
LV 2014 Service Pack 1 -- Version 14.0.1 (32bit)
with the RealTime addon (but the code in question was not run on RT)
thanks for your time.
Solved!
Go to Solution.

Why do you have the square brackets around the scan from string format string? They are not there when you generate the timestamp string so it will fail when trying to convert it back as they are expected to be there.
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Reading 16 & 22 bit signed integers using Scan From String

Last week it was suggested to use Scan from String which is a new tool for me and worked well to be able to read in ans parse strings.
After parsing the string, I'm having trouble converting the numbers into signed integers. The magnitude of some of the the outputs are unreasonably high then flip to near 0 then back up again.
Sample String (With spaces added)
$ 00 FCCE 00F6 3FFA93 0BFE 0C89 0DDB
Message Format:
Bytes 3-6 FCCE Heave acceleration bits 15-0 15-bit data, sign extended to 16 bits LSB : 0.001261g Sign “+” when accelerating upward
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$00FCDA00F73FFB3E1C2D1D051E58
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Files uploaded to the "incoming" directory cannot be downloaded. That folder is intended to be used for submitting code to NI to investigate bugs and such things, not for forum posts.
What are you expecting FCCE to be? If the string is made of the characters "F", followed by the character "C", etc. (as opposed to the hex value of F, followed by the hex value of C, etc), then you can simply use Hexadecimal String to Number. Otherwise you need to use Type Cast.
Attachments:
Example_VI.png ‏5 KB

Timestamp scan from string

Hi All,
A minor query about time stamps and scan from string. I needed to convert a string back to a timestamp and found the solution I needed at this post: Link
I wanted to make it a little more programatic and noticed that when I assembled the formatting string it would not recognise the assembled output as a Timestamp - it outputted a double. The strings inputs are identical. The double precision output converted to a Timestamp to give the correct value - so I have a work around.
I was just curious if this is a minor issue with LabVIEW or is this an intentional feature? Or is there some step I'm missing to coerce my output to a Timestamp.
Thanks,
Dave
Solved!
Go to Solution.

I convert a string to a double represented as a timestamp. The strange is that it converts wrong, if I wire a 'NaN' to the default value. Look inside the code..
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Attachments:
Untitled 1.vi ‏10 KB

Scan from string error 85

Hi Everybody,
I'm trying to use LabView to
process some data.  The data, although it was collected via labview,
has been written out to csv file format.  I have been able to
successfully open the file and use the search split string function to
remove the "header" from the data stream.  Now I'm trying to parse the
header to extract some pieces of the info that is there.  I'm trying to
do this with the Scan from String VI.
So
far I've been able to retrieve the Specimen ID from the first line of
the header by setting the format string input of Scan from String as
"Specimen ID ,%s", which works just fine.  Problem is, when I
adjust
the format string to include the next piece of data I want, I
inevitably get an Error 85, which is a failed scan. In fact, I
get an err85 every time I try to extract something from after the
second line. I've attached a VI in which I cut and pasted an
example header string in as a string constant and an example of how I'm
trying to extract the values. I've tried playing around with
spaces and different formats, but get the err85 no matter what I do
(unless I extract the first line). I have a hunch that it has
something to do with the EOL marker, but no idea how to work around it.
A search of posts here show that a lot of people have issues with the
scan from string vi, but nobody I could find had this exact
problem. I've also considered using the spreadsheet spring to
array function, but because I have a mix of commas and EOLs it doesn't
seem to work either. HELP! I really don't want to have to write this
over in VBA/Excel.
Thanks,
Turk
Message Edited by YoungTurk on 07-29-2005 10:36 AM
Attachments:
Scan.vi ‏12 KB

You should probably parse it line by line (See attached, LabVIEW 7.1)..
The attached example shows one possibility to get all the Items and values out. Not all values are strictly numeric so you would need to adapt the code a little bit. (This is just a very rough 1 minute draft).
You might want to cosider to extract all values into a cluster for further processing, Have a look at the example posted in this thread . It can be easily adapted to read the values in the proper format (DBL, I32, Date, String, etc.) depending on the item name.
Good luck!
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Attachments:
ScanMOD.vi ‏30 KB

Scan From String White Space

i all,
I'm trying to use Scan From String in order to parse some data coming in from UDP.
Input String: ASCII [00 01 02 03 ... FF]
What I want: s[00 .. 30] d[12], d[34], d[56] leftover s[37 38 39 ... FF]
ATTEMPT1
Format String: %49s%2d%2d%2d
What I get: s[00-09] RUNTIME ERROR!
ATTEMPT2
Format String: %49[^]%2d%2d%2d
What I get: Only allows first output. Will error out if I use any additional outputs from Scan From String
ATTEMPT3
Format String: %49[^(0xFF)]%2d%2d%2d Value in () is ASCII character FF.
What I get: s[00 .. 30] d[12], d[34], d[56] leftover s[37 38 39 ... FF]
It appears as though when I use %##[^] it thinks I'm looking for the ENTIRE string so it will not let me add any more Formatting. If I add a delimiter other than ^ it will run, and it will work presuming that character isn't within the first 49 characters... and I can't guarentee that it won't.
I'm aware I can parse my string using subsets and whatnot... but Scan From String is so elegant. It would be great if %S allowed for white space... or if $##[^] would simply take the first ## characters and allow me to Format after that.
Is there a simple, elegant way to do this? I wish my dataset was only 3-4 outputs. It'd be ideal if I could. Thanks.
Edit:
It might be more helpful if I provide a less abstract example:
I have an ASCII Header (Finite Length String), a Sender IP (Finite Length String), a Timestamp, a Message ID (Finite Length Decimal), A Message in ASCII ( '1' actually means 0x31, not 0x01) And for some ungodly reason... no delimiters.
So I was HOPING %##s%##s%<%H:%M:%s>t%##d (With leftover string to be my message) would work, but if any white space is contained within there... it messes up.

I cannot provide exact strings because the string is actually ASCII characters, most of which aren't displayable.
I have a string where I have:
24 ASCII Characters representing 6x U32 Header Data
13 ASCII characters represening the sender IP (string)
12 ASCII Characters representing the name of the message (String)
12 ASCII Characters representing 3x U32 Data
12 ASCII Characters represneting the name of packet (String)
12 ASCII Characters representing 12x U8 Data
256 ASCII Characters represening 256x U8 Data
etc...
It would be ideal to simply Scan from the string and output the data with the appropriate data types already assigned instead of splitting string and type casting each individualy. But if, for example, my header starts with an ASCII representation of a U32 of 2560(decimal) it would look like this: [00][00][0A][00]. ASCII 0A is considered white space. So my header would only contain 2 ASCII characters instead of the desired 24.

Scan from string in pda

Hello.
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Attachments:
scan from string.JPG ‏6 KB

Hello Greta
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Wrong use of "Scan From String" function in a while loop?

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I've got a "Scan From String" function inside a while loop. On the first iteration it converts correctly the number passed by the input string (for example 4) But on the second one it has only spaces (one or more \s) as input string.
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Scan from String (arg1) in TKTDS1k2K, Input parameter invalid

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Error scan from string

Hello, i have a problem with Labview 2013, on my pc(where i make the Vi from zero) work verry good, but when i put the Vi on laptop with the same version of labview, i get error from scan from string. hardware part are not changed, why i get this error? this is my VI.
Attachments:
Dc_motor_control2.vi ‏365 KB

Put some probes or indicators to see what is being returned from the VISA Read. It could be a simple synchronization error. Try reading more bytes.
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Get string inside brackets - Using Scan from string

I have a very basic question here. I would like extract a portion of a string which is inside brackets (Example: I work with [National Instruments]). In the string I only want to extract National Instruments, I do know logic to extract by finding the brackets and extracting them. But I am interested in using the Scan from string or possibly any other primitive in one shot. Please suggest if anyone has any idea, I am really not use to the format specifiers. I got this link for reference but I am not able to figure out a solution.
The best solution is the one you find it by yourself
Solved!
Go to Solution.

Hi,
I cannot say that it is the best solution, I use two Scan From String functions instead of one but it does work, so far ;-)
I use Characters in set.
I could not attach VI so FP is below.
Duri

"scan from string" to timestamp doesn't work for 18:00:00 (6PM)

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