Write Characters to file.vi only outputs 3 columns, I need 4.

I can format columns with 'tab', but I get a linebreak after column 3 so that data_4 appears on a new line.
I cant find any line breaks.
Attachments:
iridium_two_channels_working_copy.llb ‏80 KB

The line breaks are coming from the format to spreadhseet string functions...use a format number to fractional string function instead (on the string palette).
Other observations;
The sequence structure is not necessary, things will execute in the correct order if you let the data flow control the execution instead...and then the code becomes more readable.
To use the write characters to file repeatedly in a for loop makes things very slow because then the file is opened and closed for each iteration...instead open the file prior to the loop, just do a write in the loop..and close the file when the entire loop has finished, if there is a lot of iteration to do this will speed up the executing tremendously...
Mads
MTO

Similar Messages

File not found when using write characters to file

OK, I am missing something really basic here. Whenever I try to use the Write Characters to File function, if I try to give it a path beyond the C:\filename directory, it returns an error. In other words, C:\Dan works, but C:\Dan\Test reurns an error. WHAT am I missing?

Bingo! That is the problem. You have to make sure the directory exists before you attempt to write files to it.
BTW: In LV there is a function for creating folders programatically. A good way to see if a directory exists is to attempt to list its
contents. If the list function returns an error, the directory doesn't exist and you have to create it.
So make use of the error that the file write returns. If you get an error, start at the root of your path and test to see if each level exists, and if not create it. When you have all the folders in place repeat the file save.
Mike...
Message Edited by mikeporter on 05-24-2007 12:55 AM
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WRITE CHARACTERS TO FILE???

Hi everyone,
I am working on a VI that has to write some characters into an existing
file.
I have used: Open File--> Write to File--> Close File but once it
writes the desired data to that file it also writes some kind of bug
which cannot be read once that File is read.
Therefore I used the Wirte Characters to File SubVI which works ok.
When the new data comes in it has to replace the old one, this means
that the APPEND TO FILE option of the subVI is set to FALSE. The problem
is that everytime my VI runs and generates the new data that will
replace the old one, it asks me if I want to replace the existing file,
which is what I want to do.
My question is, if there is any way to override the prompt window that
asks if the e
xisting file will be replaced and perform the "replacement"
automatically?
Appreciate any help,
Horacio Castilleja
[email protected]

This is a common problem with using some of the simple VIs that do not
present all of the common/usefull functions.
If you "Save As..." the Write Characters to File.vi to another name like "My
Write Characters to File.vi" and add a boolean control
to the front panel or boolean constant to the diagram and connect it to the
"Advisory Dialog? (display:T)" boolean input of the Open/Create/Replace
File.vi, with a False, it will suppress the dialog box.
Stu
Horacio Castilleja wrote in message
news:[email protected]..
> Hi everyone,
>
> I am working on a VI that has to write some characters into an existing
> file.
> I have used: Open File--> Write to File--> Close File but once it
> writes the desired data to that file it also w
rites some kind of bug
> which cannot be read once that File is read.
> Therefore I used the Wirte Characters to File SubVI which works ok.
> When the new data comes in it has to replace the old one, this means
> that the APPEND TO FILE option of the subVI is set to FALSE. The problem
> is that everytime my VI runs and generates the new data that will
> replace the old one, it asks me if I want to replace the existing file,
> which is what I want to do.
> My question is, if there is any way to override the prompt window that
> asks if the existing file will be replaced and perform the "replacement"
> automatically?
>
> Appreciate any help,
>
>
> Horacio Castilleja
> [email protected]
>
>
>

En que barra de herramientas esta el Write Characters From File

buenos dias necesito saber en que grupo de herramientas esta la función Write Characters From File
Gracias por la ayuda

jzavala_espoch escribió:
buenos días necesito saber en que grupo de herramientas esta la función Write Characters From File
¿ "Write Characters to File" o "Write Characters From File"?, Si esta haciendo referencia a la primera este es un VI que no aparece desde la Versión 8.2 de LabVIEW ya que hacia la misma función que el "Write to Text File" si aun desea utilizarlo este VI se encuentra en la librería que se adjunta, si por el contrario es "Write Characters From File" no he observado esa funcion, a no ser que sea algun VI personalizado.
Jonathan Cruz
CHALLENGER
K U D O S __ B I E N V E N I D O S
Attachments:
file.llb ‏847 KB

Write characters to file gives a file not found error

It appears that it generates the error at the open file sub vi, but I have no problem with write to spreadsheet file which uses the same sub vi.
Jim
LV 2013

Sorry to answer with some questions..
Which version of LV are you using?
Does the file that you attempt to write to, exist? Do you specify a filename in your vi?
Otherwise,(in LV7) you will be prompted for a file. If it does not exist, the subvi will create it. If it exists, it will ask if you want to overwrite it.
Experiment with the "Write Character to File" vi by simply connecting a string to it... and run it.
BTW, your file must be closed when you attempt to write to it, otherwise the error is actually from Windows.
If you want to append to an existing file (add to it without deleting the original contents), then wire a TRUE to "Append to file". Of course, your file path should be filled in with an appropriate path & filename. In t
his case, you will not be prompted for a filename. However, you can experiment without providing (wiring) a path & filename, let LV prompt you.
Try this as a starting point. You should not get an error. If you still do, can you write what the error message is?
-enjoy-
JLV

How to read a text file and only output every other line?

I am just writing a program that reads a file but outputs only every other line. Any ideas...please? thanks

I'd start with something like this and expand on it as you go:
File file = <whatever>;
BufferedReader in = null;
try {
    in = new BufferedReader(new FileReader(file));
    int i = -1;
    for (String line = null; (line = in.readLine()) != null; ) {
        if ((++i % 2) == 0) {
            System.out.println(line);
} catch (IOException e) {
    e.printStackTrace();
} finally {
    if (in != null) {
        try {
            in.close();
        } catch (IOException e) {
}Shaun

BULK INSERT from a text (.csv) file - read only specific columns.

I am using Microsoft SQL 2005, I need to do a BULK INSERT from a .csv I just downloaded from paypal. I can't edit some of the columns that are given in the report. I am trying to load specific columns from the file.
bulk insert Orders
FROM 'C:\Users\*******\Desktop\DownloadURL123.csv'
   WITH
              FIELDTERMINATOR = ',',
                FIRSTROW = 2,
                ROWTERMINATOR = '\n'
So where would I state what column names (from row #1 on the .csv file) would be used into what specific column in the table.
I saw this on one of the sites which seemed to guide me towards the answer, but I failed.. here you go, it might help you:
FORMATFILE [ = 'format_file_path' ]
Specifies the full path of a format file. A format file describes the data file that contains stored responses created using the bcp utility on the same table or view. The format file should be used in cases in which:
The data file contains greater or fewer columns than the table or view.
The columns are in a different order.
The column delimiters vary.
There are other changes in the data format. Format files are usually created by using the bcp utility and modified with a text editor as needed. For more information, see bcp Utility.

Date, Time, Time Zone, Name, Type, Status, Currency, Gross, Fee, Net, From Email Address, To Email Address, Transaction ID, Item Title, Item ID, Buyer ID, Item URL, Closing Date, Reference Txn ID, Receipt ID,
"04/22/07", "12:00:21", "PDT", "Test", "Payment Received", "Cleared", "USD", "321", "2.32", "3213', "[email protected]", "[email protected]", "", "testing", "392302", "jdal32", "http://ddd.com", "04/22/03", "", "",
"04/22/07", "12:00:21", "PDT", "Test", "Payment Received", "Cleared", "USD", "321", "2.32", "3213', "[email protected]", "[email protected]", "", "testing", "392932930302", "jejsl32", "http://ddd.com", "04/22/03", "", "",
Do you need more than 2 rows? I did not include all the columns from the actual csv file but most of it, I am planning on taking to the first table these specfic columns: date, to email address, transaction ID, item title, item ID, buyer ID, item URL.
The other table, I don't have any values from here because I did not list them, but if you do this for me I could probably figure the other table out.
Thank you very much.

Write Characters To File VI 这个函数我找不到

我按照教材说的在file i/o 里找，但就是找不到，是和版本有关吗？我用的是8
谢谢

I don't see that either, but Write Text File should do the same thing. (It's under File I/O too)
See-Ming

How to populate column titles for y values when using Write to Measurement File Express VI with a tab delimited text-based .lvm file?

The .lvm file generated by the Write to Measurement File Express VI includes column heading titles for the y values, but they are a default value of "untitled". See attached example of a sample file when opened in Excel, the values in question are highlighted. Is there a way to specify the column titles when the file is written?
This is a similar question to this posting, which received a work around response to use the Write to Spreadsheet File.vi, rather than a solution when using this VI.
Message Edited by Hightop Raven on 05-02-2007 03:37 PM
Attachments:
column_titles.gif ‏13 KB

Sorry for the late reply. I was out of the office Friday.
You can do it, but the code can get rather ugly. Under the hood, the dynamic data type (the dark blue wire) is an array of waveforms. In your case, the scalar values you convert to a dynamic data type are being converted to an array of waveforms, each waveform having one element. You have two options.
Explicitly convert your scalars to one-element waveforms (t0=0, dt=1) and add the title before conversion to a dynamic data type.
Convert your dynamic data type to an array of waveforms and loop through them to add the column labels. The conversion blocks are in the Signal Manipulation Express palette.
I would recommend 2, since it is the easiest to add. It is also the easiest to run only on the first iteration. Just put a case selector around the loop, wire the selection to the While loop iterator, and set the case containing the label code to 0. The default case simply passes through the dynamic data.
My apologies for not including a screen shot. I am in the process of upgrading my machine and can't run LabVIEW. If you need one, let me know and I can post one tomorrow.
This account is no longer active. Contact ShadesOfGray for current posts and information.

How to read/write a binary file from/to a table with BLOB column

I have create a table with a column of data type BLOB.
I can read/write an IMAGE file from/to the column of the table using:
READ_IMAGE_FILE
WRITE_IMAGE_FILE
How can I do the same for other binary files, e.g. aaaa.zip?

There is a package procedure dbms_lob.readblobfromfile to read BLOB's from file.
http://download-east.oracle.com/docs/cd/B19306_01/appdev.102/b14258/d_lob.htm#sthref3583
To write a BLOB to file you can use a Java procedure (pre Oracle 9i R2) or utl_file.put_raw (there is no dbms_lob.writelobtofile).
http://asktom.oracle.com/pls/ask/f?p=4950:8:1559124855641433424::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:6379798216275

How do I read and write to text files on a remote computer's hard drive

I would like to read and write data to a text file on a remote computer. This is easily accomplished using one of the file functions such as "write characters to file.vi". If I am already connected to the remote computer, all I need to do is specify the path to the particular file and it will work fine.
My problem is that I want to connect to the remote computer programatically within LabVIEW (I do not want to have to use the computer's OS to establish the connection. Is there a function that I can use to do this?
Thomas D. Schaefer
Wells Manufacturing Corp

Yariv,
You should really start a new thread with a new question like this, so that more people see it. Some people look primarily at threads that have no responses yet. Also, don't post the exact same question in multiple places. Or, if you must cross-post to some other forum, make sure to mention it in your question text.
I'm happy to be a brick in your Western Wall, but I'm not sure what the main objective is here. Is the main problem really getting access to the "X bytes received in Y seconds at Z bytes/sec" string? Or is it accomplishing the file transfer? And what OS and LabVIEW version are you running?
I think your problem is that you the LabVIEW System Exec command does not allow for the degree of interactivity that you need if you want to issue a sequence of commands to a command-line executable. However, under Windows XP (and, presumably, other Windows versions, though I can't check), you can tell the FTP executable to use commands from a textfile script by using the -s switch, and you can override the prompts during multiple file transfers with the -i switch:
ftp -i -s:FILEPATH SERVERNAME
If you issue a command in this format to System Exec, and make sure to create a file at FILEPATH with your command sequence (one per line), then you should at least accomplish the FTP actions. This won't give you the transfer details in the standard output, unfortunately. However, if you just want a general sense of how much was transferred and how quickly it happened, you can code that in LabVIEW by getting the resulting file sizes and using Tick Count before and after the System Exec call to see how long the transfer took.
Hope that helps,
John

File - read only

I create new file using only "Write Characters To File".
(I don't want user to see dialog to choose file name,etc.)
I create .CSV file, and I want to set file as read only for any
other applications except LabView. When MS Excel opens this file
LabView is unable to write data to it.
Is it any simple way to solve this ? Or di I must use .vi's that show dialog
to chose file and dir.
-jcz-

When a file has been marked as "read only", then Excel open it in read only mode, and the file remains accessible to other applications. What you have to do is to switch the "Acces Rights"(in the advanced file function subpalette) between $80 and $100, to respectively unlock and lock the file, at each write operation in LabVIEW.
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...

How to combine both DAQ AI signal, write and read file in single VI

Hi
I am the new user of LabVIEW version 7.1 for testing automation application. I have to measure 33 signals ( mostly analog like temp, pressure, etc...) from NI USB 6210 DAQ system and write in master file for future verfication.From real data or from master file back up have to write one more file if only the signal reaches steady state , which will used for analysis and same signals to be read from this file parallely & make a waveform and/or table display format.
Pl. help me to shortout this problem
note: I have plan to ugrade labVIEW version 2011 shortly, so let me know doing parrel acquistion write and read file for data analysis in same VI in version 7.1......

Parallel operations in LabVIEW are very simple. Just code it in parallel and it will work.
Try taking a look at some of the examples in the NI Example Finder (Help > Find Examples). There you will find example for writing to and reading from files, as well as data acquistion in parallel with other operations.
You might need a producer/consumer architecture is you are acquiring data very quickly.
Chris
Certified LabVIEW Architect
Certified TestStand Architect

Write character to files++

Hello,
In the past there was a Vi "Write Characters to File++1" which was returning the actual file name. It seems that this function does not exist anymore !

It was replaced by Write to Text File. You can still access the old VI, though. It's in "LabVIEW 8.x\vi.lib\Utility\file.llb."
I can see how it might be difficult to get the filename that was selected if you leave Write to Text file unwired so the user is prompted. The easiest way around that is to put a File Dialog before you write to the file so that you can see what file was selected.

How to retrieve characters like '£' from the database and write to xml file

Hi ,
I have a requirement to retrieve the data from database and write to files in XML format.
I am able to do so successfuly by using XMLElement tag and writing to file through UTL_File package.
All characters like <&@^ get converted properly, but when it comes to multibyte chars like '£', they are not able to get converted as it is.
Can somebody please advise me how to go ahead.
Regards

Thanks odie.
The nls_charset for my database is WE8ISO8859P1 and database version is Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bi.
The data (with pound sign) is sitting in one of the columns of the table and when i query it directly, I am able to view it properly.
However when I use the below code to retrieve in XML format and print it to file, it gets changed. This file is also passed to one of the application GUI where this XML gets processsed and it is not visible properly.
below id the sample abstract of code I am using.
Declare
l_file UTL_FILE.FILE_TYPE;
l_clob CLOB;
l_buffer VARCHAR2(32767);
l_amount BINARY_INTEGER := 32767;
l_pos INTEGER := 1;
Begin
SELECT XMLElement("case",
XMLElement("comments",
XMLElement("comment",
XMLElement("comments",a.COMMENTS)
).getClobVal() val1 into l_clob
FROM TO_COMMENTS a
l_file :=
UTL_FILE.fopen (XMLDIR,
test.xml,
'w',
32767);
LOOP
DBMS_LOB.read (l_clob,
l_amount,
l_pos,
l_buffer);
UTL_FILE.put_line (l_file, l_buffer);
l_pos := l_pos + l_amount;
END LOOP;
EXCEPTION
WHEN NO_DATA_FOUND THEN
DBMS_OUTPUT.NEW_LINE('Reached end of file');
END;
The comments column given contains the character like pound.
And once the file is generated and i see using the vi editor, the char is not viewable properly like Â£
And when the same is passed to GUI application to be processed, its not viewable propely in GUI from IE as well like �.

Write Characters to file.vi only outputs 3 columns, I need 4.

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