Executing code at runtime which will be read from a file

I am very sure I have seen this but can't find this again.
I want to parse a file where some java commands might be in it and then execute them when my application is already running.
Is it possible?

There are compiler classes in the API, but they're not openly documented and their use is rather discouraged.

Similar Messages

How can I read from a file line by line?

Hi!
Could someone post some code or explain how can I read from a file, and want I to read a line each time. How can I go to line number N?
Thanks

hi,
u can try this:
try     {
      // open text file
      BufferedReader in = new BufferedReader(new FileReader(fileName));
      String line=in.readLine();
      while((line=in.readLine()) != null) {
      System.out.println(line);
      }The go to line number N i m not so sure.
Cheers
Jerry

Air App will not read local text file using openAsync/readUTFBytes on user (non-admin) mode

I am running an Air App I did for the desktop, from the actual installed executable already deployed in the machine (Not from Flash Pro / Flex dev. environment). For some reason the app will not read a text file stored in the same application folder unless I run my app as administrator from the OS.
When I run the app as admin, or within the development environment it works fine. Maybe this is related to some security issue? I read the adobe air documentation, and this should work...
I am using openAsync/readUTFBytes on user as shown here:
var continueGamesConnection:FileStream();
var continueFile:File = new File(File.applicationDirectory.resolvePath("continueGames.txt").nativePath.toString());
continueGamesConnection.addEventListener(Event.COMPLETE, openSavedGames);
continueGamesConnection.openAsync(continueFile, FileMode.UPDATE);
function openSavedGames(event:Event):void
     continueGamesConnection.removeEventListener(Event.COMPLETE, openSavedGames);
     var content:URLVariables = new URLVariables();
     var loadedContent:String = new String();
     loadedContent = continueGamesConnection.readUTFBytes(continueGamesConnection.bytesAvailable);
     content.decode(loadedContent);
     variableX = content. variableX
     //etc, etc.
     continueGamesConnection.close();
By the way, I have also, tried using FileMode.READ, and others, and it still gives me the same problem. Only works if ran on admin mode or from the dev. environment.
It's very frustrating, I tried reading other posts without any luck... What solutions do people use for this kind of problem?
I have seen that you can set the app to run as admin somehow, and I guess that could work. However, this should work just fine, since it doesn't seem to violate any of the security APIs of Air. Seems like an overkill. But even so, how do I do that?
You help is greatly appreciated!

Thanks kglad.com. I will try this and see if it works. Can you check my code a bit to see if it's right?
var continueFile:File = new File(File.applicationStorageDirectory.resolvePath("savedgames/continueGames.txt").nativePath.toString());
Does this look right to work across all desktop OS?

How to print the content in Reverse which is read from the file

i have written a program to display the content of the file using files concept. now the task is how to display it in reverse order i.e from last to first which is read from the file.

If it will all fit in memory read the file as you are doing now appending everything into a StringBuilder. Then use the reverse() method of that class to obtain your output.
http://java.sun.com/javase/6/docs/api/java/lang/StringBuilder.html#reverse()

Creating user defined pay items in a complex PO which will be created from an Approved requisition

Hi,
We want to create user defined pay items in a complex PO which will be created from an Approved Requisition.
User will select the approved Req. through WebADI and update the pay Items which will be uploaded and a complex PO will be created with user defined Pay Items.
Approach 1:
The API po_interface_s.create_documents is running good but there is one issue with this API as below.
When we add user defined pay items to the po_lines_locations interface table against a line they are also getting added to the complex PO correctly.
But the issue is coming when the API is creating default shipment lines and distribution which we dont want.
Is there any way to stop creating the default pay items and distributions?
We only want the shipments we have entered in the po_lines_locations interface.
We can delete the lines from the PO_line_locations and po_distributions base tables for the default lines but that will be the last option to do delete on base tables.
Approach 2:
We can also do the same with the open PO import interface but it is not linking the complex PO to the approved requisition from which it is created.
Oracle mentioned that this is a future enhancement and this functionality is not available in standard PO import prog.
We are trying for Approach 1 so any suggestions/solutions are appreciated to achieve the requirement.
Regards,
Sanket

UDT cannot be created in sbo-common. You may create new db and work with table in this db (but it will be not UDT, but standard sql table), or create new company db only for this purposes and create UDT there.

Photoshop CS6 will not read my raw files

I have both a Canon 5D Mark 3 and a Canon 70D and CS6 will not read my RAW files. I have to convert them to DNG to work on them. Suggestions?

According to this Adobe help link, the 5D Mark III had support since Camera Raw version 7.1 and the 70D had support since version 8.2, which CS6 should support fully. (CS6 supports up to the latest Camera Raw, which is version 8.7 as of this post.)
Is everything updated? (Help > Updates in Photoshop.)

I have iphoto '08 version with an imac osx 10.5.8. It will not read my RAW files from my Nikon D800 - a very new model.How can I get it to read my RAW files?

my somewhat old imac osx 10.5.8 with iphoto '08 will not read my RAW files from my new Nikon D800 camera - a new model on the market( 5 months or so). How can I get iphoto to read my RAW files?

iPhoto 08 would not read RAW files from that new a camera. You need to upgrade so you can get more up-to-date version of OS X and iPhoto. Another possiblity is see if iPhoto 11 will run on 10.5.8, if so you should update. You can also attempt to run Software Update and see if it finds a newer release of iPhoto 08 that supports newer RAW formats.

LabVIEW for ARM 2009 Read from text file bug

Hello,
If you use the read from text file vi for reading text files from a sdcard there is a bug when you select the option "read lines"
you cannot select how many lines you want to read, it always reads the whole file, which cause a memory fault if you read big files!
I fixed this in the code (but the software doesn't recognize a EOF anymore..) in CCGByteStreamFileSupport.c
at row 709 the memory is allocated but it tries to allocate to much (since u only want to read lines).
looking at the codes it looks like it supposed to allocated 256 for a string:
Boolean bReadEntireLine = (linemode && (cnt == 0));
if(bReadEntireLine && !cnt) {
  cnt = BUFINCR;    //BUFINCR=256
but cnt is never false since if you select read lines this is the size of the file!
the variable linemode is also the size of the file.. STRANGE!
my solution:
Boolean bReadEntireLine = (linemode && (cnt > 0)); // ==
if(bReadEntireLine) {    //if(bReadEntireLine && !cnt) {
  cnt = BUFINCR;
and now the read line option does work, and reads one line until he sees CR or LF or if the count of 256 is done.
maybe the code is good but the data link of the vi's to the variables may be not, (cnt and linemode are the size of the file!)
count should be the number of lines, like chars in char mode.
linemode should be 0 or 1.
Hope someone can fix this in the new version!
greets,
Wouter
Wouter.
"LabVIEW for ARM guru and bug destroyer"

I have another solution, the EOF works with this one.
the cnt is the bytes that are not read yet, so the first time it tries to read (and allocate 4 MB).
you only want to say that if it's in line mode and cnt > 256 (BUFINCR) cnt = BUFINCR
the next time cnt is the value of the bytes that are not read yet, so the old value minus the line (until CR LF) or if cnt (256) is reached.
with this solution the program does not try to allocate the whole file but for the max of 256.
in CCGByteStreamFileSupprt.c row 705
if(linemode && (cnt>BUFINCR)){
cnt = BUFINCR;
don't use the count input when using the vi in line mode. count does not make sense, cnt will be the total file size. also the output will be an array.
linemode seems to be the value of the file size but I checked this and it is just 0 or 1, so this is good
update: damn it doesn't work!
Wouter.
"LabVIEW for ARM guru and bug destroyer"

Read from text file vi won't read file...

I am very new to LV programming so I hope you forgive any stupid mistakes I am making.   I am using Ver. 8.2 on an XP machine.
I have a small program that stores small data sets in text files and can update them individually or read and update them all sequentially, sending the data out a USB device.   Currently I am just using two data sets, each in their own small text file. The delimiter is two commas ",,".
The program works fine as written when run in the regular programming environment. I noticed, however, as soon as I built it into a project that the one function where it would read each file sequentially to update both files the read from text file vi would return an empty data set, resulting in blank values being written back into the file. I read and rewrite the values back to the text file to place the one updated field (price) in it'sproper place. Each small text file is identified and named with a 4 digit number "ID".   I built it twce, and get the same result. I also built it into an installer and unfortunately the bug travelled into the installation as well.
Here is the overall program code in question:
Here is the reading and parsing subvi:
If you have any idea at all what could cause this I would really appreciate it!
Solved!
Go to Solution.

Hi Kiauma,
Dennis beat me to it, but here goes my two cents:
First of all, it's great to see that you're using error handling - that should make troubleshooting a lot easier. By any chance, have you observed error 7 when you try to read your files and get an empty data set? (You've probably seen that error before - it means the file wasn't found)
If you're seeing that error, the issue probably has something to do with this:
Relative paths differ in an executable. This knowledge base document sums it up pretty well. To make matters more confusing, if you ever upgrade to LabVIEW 2009 the whole scheme changes. Also, because an installer contains the executable, building the installer will always yield the same results.
Lastly, instead of parsing each set of commas using the "match pattern" function, there's a function called "spreadsheet string to array" (also on the string palette) that does exactly what you're doing, except with one function:
I hope this is helpful...
Jim

'read from text file' erases the file

I am trying to read text in from a text file. This is the exact code I am using. For some reason the output from 'read from text file' contains all the text that was originally in the file, but after the code executes the file is empty. I have several other vi's which use the same code and the file is fine. But whenever I run this code in this one specific vi the text file gets erased.

What is in the rest of that "specific vi"? I just tried the code you show, in v2011, and it works as expected, doesn't clear file.
What version are you running? Can you add an error out, or make sure error output is on in your LabVIEW configuration?
Putnam
Certified LabVIEW Developer
Senior Test Engineer
Currently using LV 6.1-LabVIEW 2012, RT8.5
LabVIEW Champion

Launch Reader from PDF file in Google Chrome browser PDF viewer

Hello!
So I have a fillable PDF form which runs document level JavaScript to essentially render itself inactive (hides fields, etc.) if opened in anything other than Reader or Acrobat. This works great, especially in Google Chrome has known problems with submitting fillable PDF forms properly.
Here is an example form: https://luxsci.com/forms/6296/2251/Qlg5/Medical_Center_Intake_Form.pdf
Open in Chrome and it's unusable, there's a warning layer, and a JavaScript alert. Open in Reader or Acrobat and it renders fine and submit works great.
When the file is downloaded in Chrome it's saved locally, i.e. Chrome displays the file URL as: file:///C:/Users/David/Downloads/Medical_Center_Intake_Form%20(3).pdf
I am trying to make the process of opening the file from Chrome in reader as simple as possible for the end user. As such, I am wondering if there is a way to add a button which will launch Reader on the end-user's desktop/laptop and open this file?
Any advice would be greatly appreciated!
Thanks!

Thanks for your comments, but that isn't the issue. We provide form processing services and have developed an effective workaround via document level JS to render the form unusable and non-submittable (is that a word?!) if opened in anything other than Adobe Reader or Acrobat. The complaint we are trying to deal with is that non-tech savvy users can't figure out how to open the PDF in Reader when Chrome auto opens it for them in the built-in broken Chrome PDF viewer.
While I could certainly provide instructions for how to install/enable the Adobe Reader plugin in Chrome, the point is to avoid requiring the non tech savvy end-user to do anything other than click a button to open the file in Reader. So asking them to install/configure the adobe PDF plugin in their browser is not a feasible solution. So what I want is this:
-PDF opens in Chrome's built-in PDF viewer and user sees notice that they can't use the form in the current program.
-User can click a button saying "Open this file in Adobe Reader"
-Clicking the button launches the local computer's Reader application, and opens the file. The PDF is then rendered normally and can be filled out and submitted as normal.
I don't really think it's possible because of browser security restrictions against launching executables, but since the browser is just showing an embedded locally downloaded PDF file, I thought maybe there's a way...
Thanks!

Help: Servlet can't read from properties file

I am working on a web application running in Tomcat on Linux.My java source file reads some parameters from a properties file (data.properties)in the same directory. This works well in a simple application. However, if it is used in the Tomcat environment, it can't be read by a servlet file (LoginServlet.java). I put both the "LoginServlet.class" and "data.properties" in the following directory: /webapps/myapp/WEB-INF/classes. When I run the web application in Tomcat, the error is "data.properties not found". What is the problem? Do I need to modify my "web.xml" and/or Tomcat's "server.xml"? If so, how to modify them?
This web application contains a lot of serlets. So I don't want to hardcode the parameters into the servlet codes.
Any info will be appreciated. Thanks in advance!:)

Putting the properties file in webapps/myapp may or may not help.
My assumption is that you are trying to open the file by brute force, with something like
InputStream propis = new FileInputStream ("data.properties");
Properties props = new Properties ( );
props.load (propis);
What you want is to have the class loader find a file in the same place as the class file, and give you back an input stream reading from that file, which you can then pass to the Properties.load(InputStream) method. This is called a "resource," and the way to do it is:
InputStream propis = getServletContext().getResourceAsStream("data.properties");
// remaining code as above
This will cause the class loader for the servlet context (a/k/a the Web application) to find the file in the same manner as it might find a class, but instead of treating it as compiled JVM code, and loading it, it simply passes you back an InputStream from which you do whatever you want.
Cheers!
Jerry Oberle
perl -e 'printf "mailto%cg%s%cearthlink%cnet\n", 58, "oberle", 64, 46;'

Reading from a file doesn't work...

Hi All,
I am tring to read from a file tickets.txt and when I do this
BufferedReader inFile = new BufferedReader (new FileReader("tickets.txt"));
StringTokenizer tokens = new StringTokenizer(inFile.readLine(), ":");StringTokenizer throws a null pointer exception... and I couldn't work out why... so I did this in between BufferedReader and StringToken
System.out.println(inFile);And it printed this on the screen... which is not in my file...
java.io.BufferedReader@1c78e57
Please Help,
Mike

C:\Program Files\Java Studio_JDK\s1studio\bin
is what it prints... which is not where my file is...
but it created a file there ... and I added stuff to the new file I found and it still prints null?
some of my code...
PrintWriter pw = new PrintWriter (new BufferedWriter (new FileWriter ("tickets.txt")));
BufferedReader inFile = new BufferedReader (new FileReader("tickets.txt"));
System.out.println(inFile.readLine());
BufferedReader stdin = new BufferedReader (new InputStreamReader(System.in));thats all in the main and thats all that really has anything to do with tickets.txt right now... everything else is commented out for now...once I manage to read the file then I will uncomment it...(the methods and stuff)
Thanks,
Mike

How to read from excel file and write it using implicit jsp out object

our code is as below:Please give us proper solution.
we are reading from Excel file and writing in dynamicaly generated Excel file.it is writing but not as original excel sheet.we are using response.setContentType and response.setHeader for generating pop up for saveing the original file in to dynamically generated Excel file.
<%@ page contentType="application/vnd.ms-excel" %>
<%
     //String dLoadFile = (String)request.getParameter("jspname1");
     String dLoadFile = "c:/purge_trns_nav.xls" ;
     File f = new File(dLoadFile);
     //set the content type(can be excel/word/powerpoint etc..)
     response.setContentType ("application/msexcel");
     //get the file name
     String name = f.getName().substring(f.getName().lastIndexOf("/") + 1,f.getName().length());
     //set the header and also the Name by which user will be prompted to save
     response.setHeader ("Content-Disposition", "attachment;     filename="+name);
     //OPen an input stream to the file and post the file contents thru the
     //servlet output stream to the client m/c
          FileInputStream in = new FileInputStream(f);
          //ServletOutputStream outs = response.getOutputStream();
          int bit = 10;
          int i = 0;
          try {
                    while (bit >= 0) {
                    bit = in.read();
                    out.write(bit) ;
} catch (IOException ioe) { ioe.printStackTrace(System.out); }
          out.flush();
out.close();
in.close();
%>

If you want to copy files as fast as possible, without processing them (as the DOS "copy" or the Unix "cp" command), you can try the java.nio.channels package.
import java.nio.*;
import java.nio.channels.*;
import java.io.*;
import java.util.*;
import java.text.*;
class Kopy {
     * @param args [0] = source filename
     *        args [1] = destination filename
    public static void main(String[] args) throws Exception {
        if (args.length != 2) {
            System.err.println ("Syntax: java -cp . Kopy source destination");
            System.exit(1);
        File in = new File(args[0]);
        long fileLength = in.length();
        long t = System.currentTimeMillis();
        FileInputStream fis = new FileInputStream (in);
        FileOutputStream fos = new FileOutputStream (args[1]);
        FileChannel fci = fis.getChannel();
        FileChannel fco = fos.getChannel();
        fco.transferFrom(fci, 0, fileLength);
        fis.close();
        fos.close();
        t = System.currentTimeMillis() - t;
        NumberFormat nf = new DecimalFormat("#,##0.00");
        System.out.print (nf.format(fileLength/1024.0) + "kB copied");
        if (t > 0) {
            System.out.println (" in " + t + "ms: " + nf.format(fileLength / 1.024 / t) + " kB/s");
}

How to open saved files using 'read from text file' function

Hi everyone, I am having a hard time trying to solve the this particular problem ( probably because I am a newb to lanbview ). Anyway , I am able to save the acquired waveforms by using the 'Write to text file' icon. I did manually modify the block diagram of the 'Write to text file' icon and create the correct number of connector so as to make my program work. But now I have no idea on how to modify the block diagram of the 'Read from text file' block diagram to make my program 'open' my saved waveforms. Or i do not have to modify anything from the block diagram of the 'Read from text file'? Can anyone teach/help me connect up? Do i need the build array on the "open" page?
Here are some screenshots on part of my program
let me know if you guys would need more information / screenshots thank you!
Attachments:
ss_save.jpg ‏94 KB
ss_open.jpg ‏94 KB
modified_writetotextfile.jpg ‏99 KB

Ohmy, thanks altenbach. oh yeah i forgot about those sub VIs. will upload them now. Was rather demoralized after reading the comments and really struck me on how weak i'm at on labview really hope to get this done. But of course i have to study through and see how it works. Actually i am going to replace those 'signal generators sub vi' with ThoughtTechonology's sample code so i can obtain data waveforms real-time using Electrocardiography (ECG) ,Electromyography (EMG ) and Electroencephalography (EEG) hopefully i can find out how to connect the sample code.
( ps . cant connect it now unless my program is working otherwise labview will crash )
( p.s.s the encoder of my biofeedback trainer already acts as an DAQ so i wont need to place an DAQ assistant in my block diagram i suppose )
The sample code of ThoughtTechnology is named as attachment.ashx.vi. too bad i cant use it and present it as my project
Attachments:
frequency detactor.vi ‏53 KB
signal generator.vi ‏13 KB
attachment.ashx.vi ‏40 KB

Executing code at runtime which will be read from a file

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