LabVIEW for memory read/write?

I know LabVIEW has In Port / Out Port vi for the I/O space read /
write. I am wondering if LabVIEW has read/write memory vi? As we know,
Windows 2000/XP do not allow to read/write I/O port and memory
directly from user level(kernel level is OK).

May be this post can be of interest to you (I haven't try this myself but it looks like a solution). Hope this helps.

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Duplicate post please refer to:
http://forums.ni.com/t5/Instrument-Control-GPIB-Serial/How-to-make-labview-to-receive-information-fr...
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Chris T.
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I'm looking for the read/write speeds for my Mac's.

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http://support.apple.com/kb/HT3598?viewlocale=en_US&locale=en_US

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Problem in a nutshell...
I have an AIR app to process images.. organize and add information. This information is read and written to local XML files. This is working fine (if still a be messy... still learning this OOP stuff ;O)
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Hi Jeba,
Whenever u are using *"Thread.currentThread().getContextClassLoader()"* Code inside your application means the Files (Resources) which you are looking right now must be poresent in the CLASSPATH...(Bootstrap classloader/ System ClassLoader/ Application ClassLoader/ Sub Module ClassLoader...).
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Hi,
In the example I posted before, you don't want to use any of the DAQmx VIs. You would replace these with the arduino code but use the same frequency calculation.
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How to use IXXAT CAN to USB in LabVIEW for CAN read, when I am having VCI V3 driver?

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Did you check the settings to make sure that the Password Manager is enabled?
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Slight static during major memory read/write

It just started doing this. Random static comes on whenever I load a big program like firefox. Stops as soon as firefox is done loading. (not a page, the application)
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The enterprise manager said the the datafile needs recovery but when I execute the recover I receive:
638.1497.793881221 thread=3 sequence=638
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Cluster and Read Write XML

In my applications I allow users to save their settings. I used to do this in a Ini file. So I wrote a Vi that could write any cluster and it worked ok. When I discovered that in the newer versions of LabVIEW you could Read/Write From/To xml, I changed inmediatly because it have some advantages form me but I am having some trouble.
Every time I want to save a cluster I have to use
Flatten To XML -> Escape XML -> Write XML
and to load
Load From XML -> Unescape XML -> Unflatten from XML.
I also do other important things each time I save or load settings. So it seems to be reasonable to put all this in just two subvi's. (One for loading, One for saving). The problem is that I want to use it with any cluster
What I want with can be summarized as following:
- SaveSettings.vi
--Inputs:
---Filename
---AnyCluster
---Error In
--Outputs
---Error Out
-LoadSettings.vi
Inputs:
---Filename
---AnyCluster
---Error In
Outputs
---DataFromXML
---Error Out
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Thanks,
Hernan

If I am correct you still you need to wire the data type to the Variant To Data. How can you put in a subvi ALL that is needed to handle the read/write of the cluster? I don't want to put any Flatten To XML or Unflatten From XML outside.
The solution I came out with INI files was passing a reference to a cluster control but it is real unconfortable because I have to itereate through all items.
When a control has a "Anything" input, is there any way to wire that input to a control and remains "Anything"?
Thanks
Hernan

Different read/write VI's

Hello,
I notice that in labview, I can:
read/write to a SPREADSHEET
This requires FILE_PATH and FORMAT
read/write to a FILE
This requires a FILE_PATH and NO format
(because it is binary data)
I can read lines... BUT I CANNOT write lines
First question: why can I not write lines?
Continuing... there are other ways to read/write.
I can OPEN a file
And, then I can read/write
So: how is THIS read/write different from the ones above.
I can see that THIS read/write requires a refnum from the
open... OK... one structural difference...
This one does not allow for formatting... but yields a BROWN data.
Now, what is this DATA... is it binary?
What is the purpose of the OPEN/read/write/Close
on the second lines of the FIL
E/IO vi's
Can someone describe these and how they relate to each other?
Thanks,
Tom
Hello,

Tom Impelluso wrote:
> Hello,
>
> I notice that in labview, I can:
>
> read/write to a SPREADSHEET
> This requires FILE_PATH and FORMAT
>
This is called a TAB delimited file that most spreadsheet applications
can read
there is a TAB between columns and and EOL between rows. Writes in ASCII
(I should say ASCII printable since all chars are ASCII)
>
> read/write to a FILE
> This requires a FILE_PATH and NO format
> (because it is binary data)
Yep
>
>
> I can read lines... BUT I CANNOT write lines
>
> First question: why can I not write lines?
>
I found this strange also but, you can use the Write Char or generate
your own VI from
the lower level VIS. Which would be using the Write Char and adding EOL
as the last character in the line
There is a VI called Write + (String) that does not show up in the
palette but is used in some of the other VIs.
>
> Continuing... there are other ways to read/write.
>
> I can OPEN a file
>
> And, then I can read/write
>
> So: how is THIS read/write different from the ones above.
It is a byte stream which could be almost anything from ASCII to G
datatypes
>
>
> I can see that THIS read/write requires a refnum from the
> open... OK... one structural difference...
> This one does not allow for formatting... but yields a BROWN data.
>
> Now, what is this DATA... is it binary?
Not always but it can be. If you open an Excel file in a text editor you
will see
what a complex byte stream file looks like. The data is interspersed
with formatting bytes.
>
>
> What is the purpose of the OPEN/read/write/Close
> on the second lines of the FILE/IO vi's
these are the primitives that are used in all of the other file
functions.
This is the most basic level of what file I/O does.
>
>
> Can someone describe these and how they relate to each other?
The Open/Read/Write/Close are the primitves. The others are built up
from these
for special file types (like spreadsheet). They use the primitives and
add some formatting
and other options.
Dont reply to this e-mail address. My account is down and I am using
someone elses.
Kevin Kent

NFC tags read/write operations on low level

Hi,
I know this is little bit offtopic question - but since you are experts in the area I will try to ask you probably a pretty simple question:
1/ I would like to know which protocol is used for the read/write operations to the NFC tags are used. According to my understanding after the tag is placed on the NFC reader (NFC phone, USB reader), it is powered and set to the ready state. Then the application protocol for read/write operation is used. As I think the exact format and the content of commands used for read/write is not specified in ISO 14443 and it is dependent on a tag hardware/manufacturer and will be different for FeliCa/Mifare/Innovision/etc. tags, so there is no way how to handle NFC tags read/write operations with the single implementation. Is that assumption correct?
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Thank you for reply
Kind regards,
STeN

hello,
you have to read the NFC forum specs. all of this will be better explained than by me.
more than one protocol are used according the the contactless front end configuration and abilities. It includes ISO14443-A, ISO14443-B and Felica. Sometimes other protocols are also available, for example Innovatron (not Innovision lol)
Mifare is not a protocol, it is a line of NXP products. These products use the lower layers of the ISO14443-A protocol specification.
There are 4 types of tags
1) using the lower layers of ISO14443-A
2) using the lower layers of ISO14443-B
3) something related to felica?
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Sebastien

Access 2013 Read/Write Connection on 365

Have web tables all set up on 365 account. Have set the connection management to Read/Write. But I can't figure out how to link to them from a desktop Access app.
From within the desktop app if I use the External Data tab - to link to them - attempting the Sharepoint Lists - - - the tables don't appear. Am pretty sure because the web tables on 365 are not Sharepoint Lists.
Have searched on this for awhile and am not finding instructions anywhere. ... One can get a Reporting desktop app set up with a single button but it is read only......sure wish it was this easy for read/write.....
Appreciate any help......

It still possible to use a 2010 web application in 2013 that is using SharePoint tables, so some confusing here is legitimate.
In your case as you WELL note you using 2013, and thus as you WELL note it makes no sense to look for tables in SharePoint when clearly that is not where they reside.
To find the connection string in the web application just go file.
You see your application name, and below that
Data Connectivity
In that you see the server name, and the database name. You can use your 365 Account as the logon + password.
However, for a read/write? In the above area, click on "manage" beside the connections.
In the list of options for connections such as "From any location", and the "Enable Read-write" connections, there is an option called:
View Read-Write Connection Information
Click on the above option. This will result in a dialog box that gives you database name, and the user + password required to link to that database in read/write mode.
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Albert D. Kallal (Access MVP)
Edmonton, Alberta Canada

Destination u have specified does not have read/ write access- FCP 7 to Compressor problem!

Hello everyone,
I finally got a video finished in FCP 7, and sent it to Compressor.
When I try to add a templete (any template, but particularly the Youtube), I get a red || Source ! || message and when I hit the submit button I see: "The destination you have specified does not have read/ write access. Check to see if the folder is set to read-only, or check your write privileges."
What the?
I'm using Apple ProRes 422 files.
I tried looking at the video files themselves, with Control + I. It looks like I have "Read & Write" access to me. I'm not sure what to do.
I also tried looking in my preferences for Final Cut Pro stuff, and it was empty, so nothing to erase. I also repaired disk permissions with the Utility application.
Well, thanks for any help.

I haven't tried to save to any directory.
As soon as I send the sequence from Final Cut to Compressor, I am prompted to drag the settings to the destination... but it won't let me submit it for the "read/ write" reasons above.
So I never get the opportunity to save it, I just close out Compressor and go back to Final Cut Pro.
I'm wondering if it has something to do with the scratch disk files. I converted the MOV files into ProRes files and keep them in my documents, then I just dragged and dropped them into the browser. I'm wondering if somehow this is affecting things, because I can't even find a scratch disk folder with files inside.
I also tried to look at my Final Cut Pro preferences file, but I had no idea what I was looking at so I just left it alone.
I really appreciate this by the way.

G710 hard drive read/write speed

Hello,
I have a brand new Ideapad G710 with 1TB Serial ATA 2, 5400rpm with advertised speed of 3 Gb/s (= 384MB/s).
I am running Windows 7 ultimate x64 with SP1.
When I test hard drive read/write speed (I used CrystalDiskMark) I get results of about 100MB/s, which is 3-4 times slower than it should be.
I am not running any resource heavy applications (Resource monitor reports Disk I/O to be 0 most of the time in idle state). I have 3 partitions, each with 16-32GB paging file size and all are >90% empty. All partitions have been defragmented before testing.
Is this normal? Are there any lenovo drivers or utilities than I might be missing or that can slow/speed this?
Solved!
Go to Solution.

hi Daew,
Welcome to the Lenovo Forums.
The results that you got while running CrystalDiskMark is normal. The SATA 2 (3Gb/s) that you mentioned is actually the SATA interface support, not the actual read/write performance.
If you have a Seagate HDD (eg. ST10000LM024), check these specs
From the above specs, the unit has a cache that has a read/write max speed of 145 MB/s but there are environmental factors and power requirements to get this speed (eg. read/write speed on AC power is differente from battery power).
AFAIK, if this is the specs that is design for this drive, there's no way to speed it up.
If you're planning to upgrade in the future though, you can get an SSD for faster read/write.
Regards
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How to inherit /usr and make /usr/local read/write

Is there some way where I can make "/usr" a inherit-pkg-dir, and yet make "/usr/local" a read/write directory. I notice a lot of things I compile want to use "/usr/local" to write to, yet I don't want to remove the inherit for /usr, since a lot of packages go into that directory I would like inherited.
One work around I tried was to make a symbolic link in the global from "/usr/local" to /local" on the root, and then create a "/local" directory in the non-global zone. This still caused problems.
So is there any other work arounds or do I have to remove the inherit for "/usr" to make "/usr/local" writeable?

One work around I tried was to make a symbolic link
nk in the global from "/usr/local" to /local" on the
root, and then create a "/local" directory in the
non-global zone. This still caused problems.We've had success here using the workaround you mentioned.
We install all of our large software packages in /opt/<package-version>, and treat them as if they are read-only. There are a few exceptions to this -- there are some vendor supplied packages that can't be configured to write logs/configs/whatever outside of it's base directory. The packages supporting our in house software is called /opt/company.
When it comes to collections of small utilities (awk, fileutils, findutils, etc, etc) we pre-install as much stuff as makes sense with a prefix of /opt/local-<version>, and then distribute this to all of our machines (And subsequently treat it as read only). If we find we missed something that needs to go everywhere, we'll update the /opt/local-<version+1> and change the symlinks to /opt/local. If it's something that just needs to run on a couple machines we'll just make a new /opt/<package-version>.
In the global zone, we make a symlink for /opt/(read/write dir) to go to a /local/opt/. When /opt is mounted read-only on a zone, the symlinks within /opt point to whatever /local/ that is hosted local to the zone. So our /local directory might have /local/opt/company, /local/opt/inflexible-vendor-1.0.2, etc.
So far, we have half a dozen test zones created like this and haven't seen any problems. What kind of issues are you seeing when installing like this? (crossing fingers we haven't missed a Fatal Flaw :-))
-A

LabVIEW for memory read/write?

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