saving files between multiple tabs in the same race

Initially I thought that it was a simple question, I had, but I spent some time trying to fix it and I'm out of ideas.

The goal is to be able to record different tabs for a VI that controls an instrument, each tab is another mode of measurement. So, first I created a VI that I could press a power button and register a separate file for each press. I was able to do it without problem. Then I tried to add features to this VI to a tab structure. The goal is that I can press a power button and record a separate file for each press on one of the tabs (and in the course of execution, use each tab). However, regardless of what I have tried I can't seem to be able to save more than one tab at a time. The first tab of the race is functional, but then any subsequent tab is not. I tried chaning the loop structure and how to write files, but nothing worked. I have attached a VI that displays the problem without the [extreme] amount of irrelevant information that has the original.

Any ideas? Thanks in advance.

You can't wait to operate through different tabs in a single pass without a loop around the code. Programming LabVIEW is based entirely on the data flow and parallelism. It is incredibly powerful and has led to its success over the years (coupled with graphical programming), but is usually one of the first things the new developers stumble on. This is a simple resource to familiarize themselves with its functioning. The function to highlight execution is a great way to watch how your application uses data streams.

You must move your Boolean control within the structure of the event in the registry value correctly, and your code will lock up since you have several structures of events separated in the case of the tab.

You won't like hearing this, but the tab control is incredibly dangerous because you can easily lock your code. What that means, ideally, you don't use control tab for appearances or subsections of your code you want to operate differently depending on whether the tab is selected.

One of the first applications I made, which I was so proud of, had a tab control serving of main container for code inside. It worked fine for a while, but I found I duplicate a lot of code and then sometimes it would not close, so I have to throw the code to extinguish a fire after another.

Notice how your tab case all look the same with minor differences depending on the boolean type and the measurement? This means that if you make a change because of a tab, you'll probably end up wanting to make this same change to all the other tabs and now your workload is tripled for a change.

Look in the Computer of State Simple model that comes with LabVIEW. It really is the best way for new developers to get familiar with LabVIEW using a semi scalable architecture.

Here is a large example of the works of a state machine:

States: Init, slowed down, exit, DoThing1, DoThing2, DoThing3
Each State contains code that could take some time. Ideally, not too long because this is how long your code might not meet.
The idle state contains a structure of event for all of the user interactions.
The front panel has a button that says "do the 1 thing.

Loop iteration 0: Application starts, the first State is Init. Init State made the initialization stuff and tells the application to go to the idle state when finished.
Iteration of the loop 1: request goes to the idle state. He's sitting there, waiting for the structure of the event.
Time passes, and then the user presses the button 'do 1 thing ". There is no code or minimal code, within the occurrence of the event. The output of this state of the event tells the application to go to the State of DoThing1.
Iteration of the loop 3: Application passes to the State of DoThing1. Here, there is code that does a few things. The output of DoThing1 State tells the application to return to the idle state.
Iteration of the loop 4: Application goes to a State of rest where he waits again to the structure of the event.

Each State can tell the application to go to any State they want. You want to reset? Return to the Init State. You want to put an end to the program? Go to the exit State. You want each State to start another (such as a sequence)? Have DoThing1 out of DoThing2, which DoThing3, which outputs Idle.

You can have a different status according to the types of measure do you use and the selection of the State may still be governed by the tab control.

Tags: NI Software

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Hello

I am having a problem, I have a thah program creates a fileOutputSteam and a gzipOutputSteam and finally an imageIO wrote several images, then I do the reverse process, a
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Can someone help me?
PS: Sorry for my bad English, I'm Spanish

Code:

class Lector {

    // Atributos
    private String ruta;
    private static Collection<Imagen> imagenes;

    /**
     * Clase que carga un fichero .zip lleno de imagenes
     * @param ruta: ruta donde se halla el fichero .zip a cargar
     */
    public Lector(String ruta) {
    }
    /**
     * Constructor sin parametros
     */
    public Lector() {
    }
    /**
     * Metodo que setea el archivo que queremos cargar
     * @param ruta: Ruta del fichero a cargar
     */
    public void setArchivo(String ruta) {
        this.ruta = ruta;
        imagenes = new ArrayList<Imagen>();
    }

    /**
     *
     * @param output: Lugar donde sera representada la salida de la carga de imagenes
     * @return retorna 1 si la carga fue bien y 0 si fue mal
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     * @throws IOException: excepcion por no poder leer el fichero
     */
    public int cargarImagenes(JTextArea output) throws FileNotFoundException, IOException {
        ZipEntry entrada;
        int contador = 0;
        String archTemp = "temp.jpg";
        FileInputStream fis = new FileInputStream(ruta);
        ZipInputStream zis = new ZipInputStream(new BufferedInputStream(fis));
        BufferedOutputStream dest = null;
        byte[] data = new byte[9000];

        // Leemos secuencialmente el archivo zip
        while ((entrada = zis.getNextEntry()) != null) {
            File bufferTemporal = new File(archTemp);
            System.out.println("Archivo " + entrada.getName() + " cargado!");
            output.append("Archivo " + entrada.getName() + " cargado!\n");
            if (!entrada.isDirectory()) {
                FileOutputStream fos = new FileOutputStream(bufferTemporal);
                dest = new BufferedOutputStream(fos, 9000);

                while ((contador = zis.read(data, 0, 9000)) != -1) {
                    dest.write(data, 0, contador);
                }
                   //Cerramos los buffers
                dest.flush();
                dest.close();
                fos.flush();
                fos.close();

                FileInputStream fin = new FileInputStream(bufferTemporal);
                BufferedImage bi = ImageIO.read(fin);
                //Guardamos el fichero
                imagenes.add(new Imagen(bi, entrada.getName()));
            }
           bufferTemporal.delete();
        }
 
        // Cerramos los bufferes

        fis.close();
        zis.close();

       

        saveAsGzip("dato.gz");
        loadAsGzip("dato.gz");
        return 1;
    }
    /**
     * Funcion que carga la simagenes de dentro del .zip y las guarda en el objeto Imagen
     * @return retorna 1 si la carga fue exitosa
     * @throws FileNotFoundException: Excepcion por no encontrar el archivo
     * @throws IOException: Excepcion por no poder leer el archivo
     */
    public int cargarImagenes() throws FileNotFoundException, IOException {
        ZipEntry entrada;
        int contador = 0;
        String archTemp = "temp.jpg";
        FileInputStream fis = new FileInputStream(ruta);
        ZipInputStream zis = new ZipInputStream(new BufferedInputStream(fis));
        BufferedOutputStream dest = null;
        byte[] data = new byte[9000];

        // Leemos secuencialmente el archivo zip
        while ((entrada = zis.getNextEntry()) != null) {
            File bufferTemporal = new File(archTemp);
            System.out.println("Archivo " + entrada.getName() + " cargado!");

            if (!entrada.isDirectory()) {
                FileOutputStream fos = new FileOutputStream(bufferTemporal);
                dest = new BufferedOutputStream(fos, 9000);

                while ((contador = zis.read(data, 0, 9000)) != -1) {
                    dest.write(data, 0, contador);
                }

                dest.flush();
                dest.close();
                fos.flush();
                fos.close();
                java.io.FileInputStream fin = new FileInputStream(bufferTemporal);
                BufferedImage bi = ImageIO.read(fin);

                imagenes.add(new Imagen(bi, entrada.getName()));
            }
           
        }

        // Cerramos los bufferes
        fis.close();
        zis.close();

        dest.flush();
        dest.close();

        
        return 1;
    }
    /**
     * Funcion que retorna el array de peliculas
     * @return retorna el array de peliculas
     */
    public Collection<Imagen> getImagenes() {
        return imagenes;
    }
    public int saveAsGzip(String pathFichero) throws FileNotFoundException, IOException{

        FileOutputStream fos = new FileOutputStream(new File(pathFichero));
     //GZIPOutputStream gzip = new GZIPOutputStream(fos);
        BufferedImage temp2;
        Imagen img;

        Iterator ite = imagenes.iterator();
        while(ite.hasNext()){
            img = (Imagen) ite.next();
            temp2=img.getBufferedImagen();
            
            boolean i= ImageIO.write(temp2, "JPEG", fos);
            System.out.println(i);

        }
        System.out.println();

        //gzip.finish();
        fos.flush();
         
        fos.close();
       
        //gzip.close();

        return 1;
    }
    public int loadAsGzip(String pathFichero) throws FileNotFoundException, IOException{

        imagenes.clear();
        
        FileInputStream fos = new FileInputStream(new File(pathFichero));
     //GZIPInputStream gzip = new GZIPInputStream(fos);
        BufferedImage img;


            for(int i=0;i<=100; i++){
                

             
                img=ImageIO.read(fos);

                
                if (img != null){System.out.println(img);
                imagenes.add(new Imagen(img, String.valueOf(i)));}
                   
                


        
            }




       // gzip.close();
        fos.close();

        return 1;
    }
}

Published by: sabre150 on October 28, 2010 01:43

Moderator action: added

 tags to source.

805814 wrote:
Oh, sorry again, Ii have commented on all of the code not clear in my best English and posted the image of class:

(sigh) OK, it's an improvement, but it is not yet an NBS! I think it would take me less time to write code that is a NBS that try to explain more (perhaps an example is better here?). In all cases, your code still seems to be mixing the two Zip and GZip. I've never dealt with GZip and could not be disturbed from now just for this problem, so I focused on using the Zip classes.

Try this code:

import java.awt.*;
import java.awt.image.*;
import javax.swing.*;
import javax.imageio.*;
import java.util.*;
import java.util.zip.*;
import java.io.*;

/** SSCCE that demonstrates how to:
1) Create some random images.
2) Store them to a Zip File.
3) Restore them from a Zip File
Please study the code carefully, and note how in a single Java source of less
than 100 lines of code, it manages to achieve the entire demo.!
@author Andrew Thompson */
class StoreImagesAsZip {

    static Random random;
    static int size = 60;

    public static BufferedImage getRandomImage() {
        BufferedImage bi = new BufferedImage(size,size,BufferedImage.TYPE_INT_RGB);

        Graphics2D g = bi.createGraphics();
        GradientPaint gp = new GradientPaint(
            (float)random.nextInt(size),
            (float)random.nextInt(size),
            new Color(random.nextInt(255),random.nextInt(255),random.nextInt(255) ),
            (float)random.nextInt(size),
            (float)random.nextInt(size),
            new Color(random.nextInt(255),random.nextInt(255),random.nextInt(255) )
            );
        g.setPaint(gp);
        g.fillRect(0,0,size,size);

        return bi;
    }

    static public void writeImagesToZip(File file, BufferedImage[] images) throws Exception {
        OutputStream os = new FileOutputStream(file);
        ZipOutputStream zos = new ZipOutputStream(os);
        // Zip does nothing for otherwise compressed media formats such as JPEG and PNG
        zos.setLevel( ZipOutputStream.STORED );

        for (int ii=0; ii< images.length; ii++) {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ImageIO.write(images[ii], "png", baos);

            ZipEntry ze = new ZipEntry( ii + ".png" );
            zos.putNextEntry( ze );
            zos.write( baos.toByteArray() );
            zos.closeEntry();
        }
        zos.flush();
        zos.close();
    }

    static public BufferedImage[] readImagesFromZip(File file) throws Exception {
        ArrayList images = new ArrayList();

        ZipFile zipFile = new ZipFile(file);
        Enumeration en = zipFile.entries();
        while (en.hasMoreElements()) {
            ZipEntry ze = (ZipEntry)en.nextElement();
            InputStream is = zipFile.getInputStream(ze);
            BufferedImage bi = ImageIO.read(is);
            images.add(bi);
        }

        BufferedImage[] imageArray = new BufferedImage[images.size()];
        for (int ii=0; ii


Also note that I now invested a lot of time trying to help you. If you like what I've done, the best way to show that is on the occasion of my responses as "Helpful" or "correct". If the problem is "answered", make sure that mark also.

 
            
            
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http://Windows.Microsoft.com/en-us/Windows-Vista/share-files-with-someone
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http://Windows.Microsoft.com/en-us/Windows-Vista/sharing-files-with-the-public-folder
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