Why "write configuration file (T)" on Close Config Data vi?

If I open a config file refnum, write to one of its sections, then close the config refnum and have "write to configuration file (T)" set to FALSE, does the config file revert back to what it was when the refnum was first opened? In other words, the write to section vi essentially has no effect?
If this is not the case, what is the purpose/function of the "write to configuration file (T)" on the close config data vi?
Thanks,
Greg
Message Edited by gstanczak on 04-04-2010 04:24 PM
v7.1

The write VIs for the configuration set of VIs don't actually write anything to file - they write to a software buffer. If you open the write VIs you will see that essentially a "functional global", aka LV2-style global, aka Action Engine, is being used (albeit in a bit of a mess in my opinion). Thus, you need to set the input to True when closing it. That's what actually writes to disk. You would want to set that to False if you're just opening the file for reading.

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Cannot write configuration file

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Close config data.vi changes comment lines

When using the "close config data.vi" with write config file set to true, I get ="" appended to comment lines, like
; this is a comment line
changes to
; this is a comment line=""
Does LV6.1 not support comment lines or does it use a different character?

This is a problem of the close config vi.
The vi gets all keys (keys are the values before =) and the values (behind
=). When the data is stored, the vi puts 'key'='value' in a string for each
line.
When a empty line is encountered, this happens. The key is ''. The value is
''. The output result is ="", because empty values, and values with spaces
in them are contained between quotes.
When '; comment' is encountered, the key is ';comment', the value is '', the
result is ;comment="".
You'll have to modify a very low level sub vi inside close config.vi to
resolve this. The problem has been there since lv supports .ini files.
Regards,
Wiebe.
"BillT" wrote in message
news:[email protected]..
> Whe
n using the "close config data.vi" with write config file set to
> true, I get ="" appended to comment lines, like
>
> ; this is a comment line
>
> changes to
>
> ; this is a comment line=""
> Does LV6.1 not support comment lines or does it use a different
> character?

How to use an install.xpi configuration file to set up email data

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Start Thunderbird, close the wizard, goto the Tools menu (alt+T) select add-ons
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Modification to Write Configuration .ini file

I have found one of the annoying things about Labview's configuration file VI's is that when the configuration file is written, all spacing between sections is eliminated making it hard to read, even if the spacing was there to begin with when the file was read. For example, I would like the file to look like
[Header1]
key1=value1
key2=value2
[Header2]
key3=value3
key4=value4
But it comes out looking like:
[Header1]
key1=value1
key2=value2
[Header2]
key3=value3
key4=value4
making it harder to read.
I made a modification to the file Config Data to String.vi which is located \vi.lib\UTILITY\config.llb\
Make a backup copy of \vi.lib\UTILITY\config.llb\Config Data to String.vi and replace the file in the config.llb with the attachment (saved as LV 8.0).
What I did was any time a section header is to be written to the file, I preceded it with another CRLF character so that it creates a blank line just before the section header. To keep from having an extra blank line at the beginning of the .ini file, it does not create the CRLF there.
I hope others will find this modification useful.
Attachments:
Config Data to String.vi ‏26 KB

tst wrote:
The idea itself is great, but I don't like the idea of changing vi.lib files (for several reasons).
I didn't look at your code, but I assume that at least in this case, the resulting files will still be processed fine by machines which don't have this modification, so it's probably not as bad, but I still don't like it.
You should probably go to the Product Suggestion Center and tell NI about this idea.
I agree about not trying to change the vi.lib files. It gets into modifying code that is rather deeply embedded about 3 or 4 sub-vi's down. By my testing, machines without the modification do handle the files just fine. The alternative would be to create a backup copy of the whole library and rename the files and use my own versions instead. I've recently installed the OpenG files and looked into them. I like the functionality they provide to be able to store and retrieve clusters of configuration data. Of course they have NI's write configuration files at the heart as well, so if they link to the original VI library then they will generate the same .ini files missing the extra lines that I like.
tst wrote:
You should probably go to the Product Suggestion Center and tell NI about this idea.
Thanks, I already did this some time ago when I created a test VI to just read and close an .ini file. I found that without setting the "write configuration file" flag in the close config file VI (which defaults to True), the whole file got rewritten even though nothing had changed. That's how I stumbled across this loss of blank lines thing.
I hope NI will look into that suggestion and add it to the config file VI library in the future. It would probably need to be implemented with a flag that says "Add blank lines?" that would default to False so that the original behavior of the VI could be maintained. Since the VI that controls the appearance of the file is a few layers deeper than Close config file VI, that flag would have to be passed through a couple of sub-VI's.
Thanks for your feedback.
Message Edited by Ravens Fan on 09-22-2007 03:22 PM

Content of Ini-File with config-data sometimes deleted?

Hello,
i have a simple vi attached where i read config-data from a file.
Sometimes it happens that the content is lost. I am not sure why, but perhaps there a errors in the vi.
I wonder about the last vi "Close Config Data" there is an onput-parameter "write configuration file? (T)".
Why is this parameter set to default-TRUE? Could it be that i shouzld set it to False? Perhaps this
close-vi overwrite my data with nothing.
The vi reads the section [Par1] from this file:
[Par1]
PathFile=C:\\profile.txt
[Par2]
PathFile=C:\\variants.txt
and returns --> C:\\profile.txt
Thx for your help
Attachments:
example.vi ‏21 KB

The values set by using the INI file functions only exist in memory and are NOT written to disk until the "Close" VI with the constant set TRUE.
If your code executes in multiple threads where one thread sets the values but another thread closes the file without the constant set true, the values will be removed from memory and will not be written to disk.
So make sure you only execute the "Close" after all values have been set and make sure the constant is set true when the files are closed.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
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Write ini file doesnt work

hello,
my vi doesnt work. the vi should write data to an ini file.
has anyone an idea?
Attachments:
WriteIni.vi ‏47 KB

Set the 'Write to configuration file' to True in your Close Config Data.vi

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You should be able to. Open the .ini file, read the key (if it exitst) delete it and write a new key (you might be able to directly overwrite the key but I havent tried this). Close the file with the write file? set to true and you should have modified the .ini file with the config vis.
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How to close a write to file express VI

Hi,
I am using an Write to File express VI inside a subVI in LabVIEW 7.1. Since it is in a DAQ loop it is configured to create only one file even though it is called many times.
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Why "write configuration file (T)" on Close Config Data vi?

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