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]
>
>
>

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
Certified Professional Instructor
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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

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

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 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

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.

Read and write a .CSV file contains cirillic characters issue

Hi guys,
I am a developer of a web application project which uses Oracle Fusion Middleware technologies. We use JDeveloper 11.1.1.4.0 as development IDE.
I have a requirement to get a .csv file from WLS to application running machine. I used a downloadActinLinsener in front end .jspx in order to do that.
I use OpenCSV library to read and write .csv files.
Here is my code for read and write the .csv file,
public void dwdFile(FacesContext facesContext, OutputStream out) {
System.out.println("started");
String [] nextLine;
try {
FileInputStream fstream1 = new FileInputStream("Downloads/filetoberead.CSV");
DataInputStream in = new DataInputStream(fstream1);
BufferedReader br = new BufferedReader(new InputStreamReader(in,"UTF-8"));
CSVReader reader = new CSVReader(br,'\n');
//CSVReader reader = new CSVReader(new FileReader("Downloads/ACTIVITY_LOG_22-JAN-13.csv"),'\n');
List<String> list=new ArrayList();
while ((nextLine = reader.readNext()) != null) {
if(nextLine !=null){
for(String s:nextLine){
list.add(s);
System.out.println("list size ; "+list.size());
OutputStreamWriter w = new OutputStreamWriter(out, "UTF-8");
CSVWriter writer = new CSVWriter(w, ',','\u0000');
for(int i=0;i<list.size();i++){
System.out.println("list items"+list.get(i));
String[] entries = list.get(i).split(",");
writer.writeNext(entries);
//System.out.println("list items : "+list.get(i));
writer.close();
} catch (IOException e) {
e.printStackTrace();
say the filetoberead.CSV contains following data,
0,22012013,E,E,ASG,,O-0000,O,0000,100
1,111211,LI,0,TABO,B,M002500003593,,,К /БЭ60072715/,КАРТЕНБАЙ
2,07,Balance Free,3
1,383708,LI,0,BDSC,B,НЭ63041374,,,Т /НЭ63041374/,ОТГОНБААТАР
2,07,Balance Free,161
It reads and writes the numbers and english characters correct. All cirillic characters it prints "?" as follows,
0,22012013,E,E,ASG,,O-0000,O,0000,100
1,111211,LI,0,TABO,B,M002500003593,,,? /??60072715/,?????????
2,07,Balance Free,3
1,383708,LI,0,BDSC,B,??63041374,,,? /??63041374/,???????????
2,07,Balance Free,161
can somone please help me to resolve this problem?
Regards !
Sameera

Are you sure that the input file (e.g. "Downloads/filetoberead.CSV") is in UTF-8 character set? You can also check it using some text editor having a view in hex mode. If each Cyrillic character in your input file occupies a single byte (instead of two), then the file is not in UTF-8. Most probably it is in Cyrillic for Windows (CP1251).
If this is the case, you should modify the line
BufferedReader br = new BufferedReader(new InputStreamReader(in,"UTF-8"));toBufferedReader br = new BufferedReader(new InputStreamReader(in,"windows-1251"));Dimitar

Write to Text File.vi Output file all but first line start with tab

The attached PNG shows the code used to build up concatenated strings into a string array for the first four lines, thence to a string Array, to Spreadsheet String.vi and, finally, the use of Write to Text File.vi
The lower right corner shows the result loaded into a spreadsheet. Note the 3 blank entries marked by a filled red rectangle. Examination of hidden characters shows there is a tab at the beginning of lines 2, 3 and 4.
There is no tab shown in the code. How do those tabs get there? How do I stop them?
I have tried with the option "Convert EOL" both on and off with no difference.
The Help states that an OS-dependent EOL character is appended to each line. I can't imagine the Windows EOL character includes a tab.
Solved!
Go to Solution.
Attachments:
Tab Mystery.PNG ‏29 KB

wildcatherder wrote:
I am still puzzled as to why those additional tabs were added by Array to Spreadsheet String. I'm holding in my hand a printout of an old LabVIEW 8 program with that construction, which is known to work properly.
Makes complete sense when you look at your code. You build a string, including an end-of-line character, and put that string into an array. Then, when you run it through Array to Spreadsheet String, it puts a tab after every array element, and new line at the end of each row in the array. The first element of your array contains a new line but Array to Spreadsheet String doesn't know about it; it still inserts a tab between that array element and the next one, giving you the tabs.

Issue with Japanese characters in files/filenames in terminal.

I recently downloaded a zip file with Japanese characters in the archive and in the files within the archive. The name of the archive is "【批量下载】パノプティコン労働歌第一等.zip"
The characters are properly displayed in firefox, chrome, and other applications, but in my terminal some of the characters appear corrupted. Screenshot: https://i.imgur.com/4R22m0D.png
Additionally, this leads to corruption of the files in the archive. When I try to extract the files, this is what happens:
% unzip 【批量下载】パノプティコン労働歌第一等.zip
Archive: 【批量下载】パノプティコン労働歌第一等.zip
extracting: +ii/flac/Let's -+-ʦ1,000,000-.flac bad CRC 5f603d51 (should be debde980)
extracting: +ii/flac/+ѦѾP++ -instrumental-.flac bad CRC 78b93a2d (should be 3501d555)
extracting: +ii/flac/----.flac bad CRC ddeb1d3e (should be c05ae84f)
extracting: +ii/flac/+ѦѾP++.flac bad CRC 0ccf2725 (should be be2b58f1)
extracting: +ii/flac/Let's -+-ʦ1,000,000--instrumental-.flac bad CRC 67a39f8e (should be ece37917)
extracting: +ii/flac/.flac bad CRC f90f3aa0 (should be 41756c2c)
extracting: +ii/flac/ -instrumental-.flac bad CRC 3be03344 (should be 0b7a9cea)
extracting: +ii/flac/---- -instrumental-.flac bad CRC 569b6194 (should be adb5d5fe)
I'm not sure what could be the cause of this. I'm using uxterm with terminus as my main font and IPA gothic (a Japanese font) as my secondary font. I have a Japanese locale set up and have tried setting LANG=ja_JP.utf8 before, but the results never change.
Also, this issue isn't just with this file. This happens with nearly all archives that have Japanese characters associated with it.
Has anyone encountered this issue before or knows what might be wrong?
Last edited by Sanbanyo (2015-05-21 03:12:56)

Maybe 7zip or another tool has workarounds for broken file names, you could try that.
Or you could try to go over the files in the zip archive one-by-one and write it to files out-1, out-2, ..., out-$n without concerning yourself with the file names. You could get file endings back via the mimetype.
This script might work:
#include <stdio.h>
#include <zip.h>
static const char *template = "./out-%04d.bin";
int main(int argc, char**argv)
int err = 0;
zip_t *arc = zip_open((const char*)argv[1], ZIP_RDONLY, &err);
if(arc == NULL)
printf("Failed to open ZIP, error %d\n", err);
return -1;
zip_int64_t n = zip_get_num_entries(arc, 0);
printf("%s: # of packed files: %d\n", argv[1], n);
for(int i = 0; i < n; i++)
zip_stat_t stat;
zip_stat_index(arc, i, ZIP_FL_UNCHANGED, &stat);
char buf[stat.size];
char oname[sizeof(template)];
zip_file_t *f = zip_fopen_index(arc, (zip_int64_t)i, ZIP_FL_UNCHANGED);
zip_fread(f, (void*)&buf[0], stat.size);
snprintf(&oname[0], sizeof(template), template, i);
FILE *of = fopen(oname, "wb");
fwrite(&buf[0], stat.size, 1, of);
printf("%s: %s => %lu bytes\n", argv[1], oname, stat.size);
zip_fclose(f);
fclose(of);
zip_close(arc);
return 0;
Compile with
gcc -std=gnu99 -O3 -o unzip unzip.c -lzip
and run as
./unzip $funnyzipfile
You should get template-named, numbered output files in the current directory.
Last edited by 2ion (2015-05-21 23:09:29)

Write to Text File - unflatten channel string

Hi all,
This is my first post on the forums! It's been very helpful for me but I have not been able to find a solution to my (simple) problem.
Operating system: Windows 7 (64-bit)
Labview 2012 Full Development
I'm using the DAQmx unflatten channel string to get the names of the channels, and when I Write to Text File, I get the names of channels to be displayed vertically, ie a new row for each channel in a column. I'd like to "transpose" this, but obviously you cannot transpose a 1d array. Any ideas on how I can do this?
Any and all ideas are appreciate, thank you in advance,
-AK
Solved!
Go to Solution.

Show us how you are doing this.
My guess is that once you get the data, you have linefeed characters separating the channel names rather than some other delimiter such as a comma or a tab.
Depedning on how you are going from the channel names to the file (a string, an array of strings, Write to Spreadsheet File, Write to Text file, ....) will determine the best way to fix the problem for you.

RSEOUT00 failing with "Could not write IDoc to file" TPRI_DEF table

Outbound Idoc processing fail with the following error:
Could not write IDoc to file
Message no. EA299
Diagnosis
The system could not convert data from the data record 000027.
Procedure
Check the port definition of the receiver port.
You can use the "Continue despite conversion error" option to write the IDoc to the file from transaction BD87 with replacement characters.
Short dump indicate that there is a some junk character in th e TPRI_DEF for program SAPLSPRI that it is unable to convert.
I have set the flag on the we21 port to "continue despite conversion error" and that seem to help, but I would like to figure out how to fix the junk characters from coming through from the TPRI_DEF table.
This is what shows up in the short dump after RSEOUT00 is run.
TPRI_DEF                                   / /       : :     00002932
    010GV21            \0\0\0\0\x0006āȂ耀㐱〲\0\0嬇\0ሟ鴂푎眩\x0802儔잏퉓
I do not see any entries for area "GV" in the table, there is one for "GF". which has no user assigned to it and it is of key version 21.
I am not sure if the table is supposed to have an entry with no user assigned?
thank you for looking at this issue .

HI Jurgen,
we have the same issue, chinese charecter is in PO text header. so facing error. If we click unicode format then it works fine as my testing in development.
I just want to knom what is the impact if i clicked directly unicode format ?( with refernce to your reply above " have you set the Unicode format flag directly above in WE21?" )
I doc is going from SAP sytem - (PO information )
Pls adivce..
waiting for your reply..
Thanks in advance

Pls help.JSP: I could not store Chinese characters into files.

Hi experts,
I have this problem of cant store chinese characters into files(eg. .txt and .properties). I am adding
these chinese text through a JSP website form....After i key in chinese characters in the textboxes
in the website and sumbit the results, my chinese characters turned into ASCII or rather garbage in
the files.
Is there any way i can get the exact chinese characters i entered in the webite into the files?
Need urgent assistance here.
Thanks
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Connection con = null;
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Class.forName("org.postgresql.Driver");
con = DriverManager.getConnection("jdbc:postgresql://172.20.134.110:5432/smsINTFET" , "postgres",
"postgres");
catch(ClassNotFoundException e) {
out.println("Could not load the driver: "+e.getMessage());
catch(SQLException e) {
out.println("SQLException caught in relax db: "+ e.getMessage());
Statement stmt = null;
ResultSet rs = null;
ResultSet ps = null;
String strSQL = "";
String strSQL2 = "";
String tempCat = "";
strSQL="SELECT gamename FROM cp_games order by gameid;";
try {
stmt = con.createStatement();
rs = stmt.executeQuery(strSQL);
stmt.close();
catch(SQLException e) {
out.println("SQLException caught: "+ e.getMessage());
while(rs.next())
check=0;
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if(temp.equalsIgnoreCase(gameName))
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check=1;
break;
else
check=0;
if(check==0)
%>
<body background="button/bkgd.jpg" bgproperties="fixed">
Confirmation
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The following information has been added.
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<%
String strCat="";
strCat="INSERT INTO cp_games(gamename,description,encode) values('"+gameName+"','"+info+"','"+encode+"');";
stmt = con.createStatement();
stmt.executeUpdate(strCat);
System.out.println("Successful inserted category");
stmt.close();
//setting language
if(encode.equals("ascii"))
langCode = "US";
if(encode.equals("ms950"))
langCode = "TW";
if(encode.equals("ms936"))
langCode = "CN";
strSQL2="SELECT gameid FROM cp_games where gamename = '"+gameName+"';";
try {
stmt = con.createStatement();
ps = stmt.executeQuery(strSQL2);
stmt.close();
catch(SQLException e) {
out.println("SQLException caught: "+ e.getMessage());
ps.next();
nextGameID=ps.getInt("gameid");
out.println("The game number : " + nextGameID);
%>
<tr>
<td>Game added: <%=gameName%>
</td>
</tr>
</table>
<%
String newFile="G:\\home\\smsGamesINTV2\\colorGame\\propertiesFiles\\FET\\CP_Game"+nextGameID+"_"+encode+"_"+langCode+".properties";
try
{ //begin file
PrintWriter outFile=null;
//create a new file and write the initial settings to file
outFile=new PrintWriter(new FileOutputStream(newFile,true));
outFile.println("game_intro="+nextGameID+")"+gameName+" - "+info);
outFile.println("");
outFile.println("game_title="+gameName);
outFile.println("");
outFile.println("game_type="+gameType);
outFile.println("");
outFile.println("qns_no=0");
outFile.println("");
outFile.println("ana_no=0");
outFile.close();
}//end file
catch(IOException e)
out.println("File Create Error");
else // no match found
out.println("Game,"+temp+ " already added");
%>
</body>
</html>

try to add this code under this line:
<%@ page contentType="text/html; charset=big5" %>
<% response.setContentType("text/html; charset=big5"); %>
I have faced the problem like yours and it works fine for me. Try and see.

Write arrays to file

Hi,
I want to write some arrays into a file side by side.
Like that..
A B C D
1 0,25 0,4 0,25
2 0,36 0,3 0,96
Hox can i do it?
Thanks a lot..
irfan

The question is how you want to read the saved data.
- If you want to be able to open the file in a text editor or Microsoft Excel, then you should save the 2D-array as ASCII-characters - easiest example is to use the "Write To Spreadsheet File.vi" from the "File I/O" palette.
- If you only want to read the file from LabVIEW then the most efficient method is to save as binary data. Here is an excellent KnowledgeBase that shows this concept.
Please notice that saving your data as binary data makes it impossible for you to open it in Excel.
Best regards,
Philip C.
National In
struments
- Philip Courtois, Thinkbot Solutions

WRITE CHARACTERS TO FILE???

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