Buffered reader problem

hi, any idea why when i use the code below i have to enter the text three times before the system recognises it?
try {
BufferedReader console = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Please type text to convert and press enter...");
text = console.readLine();
Thanks

Put a System.out.println("Hey, you entered: " + text);
right after that readLine() call.
It shouldn't be so mysterious, Ted.

Similar Messages

Problems with buffered reads, buffers

I have a few questions and issues that I have not been able to resolve with forum searches, I will try to keep them concise here. #1 is the most important one to me.
LabVIEW 7.1, Windows XP.
Buffered Reads / Lost Data
When error 10846 (AI Buffered Read, app unable to retrieve data from background acquisition buffer fast enough) occurs, I receive no data from the AI Buffered Read function for a period of time. The error states data may be lost but it seems like I get NO data. See the attached VI and JPG for examples. The bottom graph shows a normal read while the top graph shows one with this problem. I realize the AI Read error cluster is not handled in the acquisition loop. From watching the backlog while the program runs, it seems the “dead spots” occur after the backlog reaches the buffer size. When stopping acquisition, sometimes the error handler outside the loop reports 10846, sometimes it doesn’t (when the dead spots are occurring). I can exaggerate dead spots with setups as follows:
Buffer size 5, Scan rate 1000, # Scans to read 100
Buffer size 10000, Scan rate 5500, # Scans to read 100
The size of the dead spots and continuous data are proportional to the buffer size.
Questions....
1. Shouldn’t the AI Read function wait until it has # scans to read of valid data before returning? For instance, scan rate of 100 and # scans to read of 1000 slows loop iteration speed to 0.1 Hz. It seems like it is returning nothing for a period of time after the backlog reaches the buffer size.
2. Error 10846 refers to the “data acquisition buffer.” Is this the software buffer? If so, what would LV refer to the hardware buffer as?
3. I know the PCI-MIO-16E-1 has a hardware buffer, does this mean I can accurately acquire data over a period of time at a specified frequency (within limitations of the card of course) without having to worry about Windows bogging down due to delayed writes and such?
4. Will hardware acquisition buffers generate an error if the data in them is lost/overwritten?
5. I tried loading the acquisition VI (attached) onto a LV computer that has only a new USB-6008 connected but the AI read/config/clear functions were not available on that system. Does this device not have hardware buffers (either I’m looking in the wrong places to find the answer this question and it uses different VIs OR it doesn’t have them).
6. The buffer/scan configuration listed above was used to exaggerate error 10846 and the accompanying dead spots but this problem has been intermittently plaguing a system I have been trying to understand/fix. I have logged the backlog value as the program runs and see that it increases during certain processor-heavy state machine states and am hoping upgrading from 256MB to 2GB RAM will improve this. Is there any reason I should not look at this as a solution? (I am also planning on adding an error handler for AI Read into each acquisition loop so the problem can not continue to go on without detection!!!!!!!!!)
7. Shouldn’t the AI Clear function report an error from the AI Read error cluster, even if it happened several reads earlier? It seems like it does not do this; if I put the error handler in the acquisition loop I receive an error as soon as the backlog reaches the buffer size, EVERY time. I thought I figured this out and changed the acquisition loop tunnels to shift registers... the error is reported each time this way; if AI Read will not acquire data if an error is fed into it in the first place then I guess I understand this one so I’m moving it to the bottom of the list.
Thank you all for your time, I have been struggling to get up to speed with DAQ and LV and appreciate all the support. I look forward to giving back to NI’s community in the future.
Regards,
David.

After all that typing I forgot the attachements, they should be on this post.
I take it the AI.llb functions are "traditional DAQ." I've started to experiment with the express VIs with newer hardware that I have been working with (USB-6008, USB-6211). I will have to look at the DAQmx functions, it seems the express VIs are frowned upon by most.
I have been working on modifying an older program that uses the traditional DAQ functions. I will have to get more comfortable with DAQmx before attempting to change it over to them. The attached example was wrote as I tried to understand what was going on in the program I was modifying.
I believe the missing error handler on the AI Read function was causing unexpected (i.e. nothing returned) results the next time AI Read was called when the backlog exceeded the buffer value. Subsequent calls to AI Read worked as expected unless the buffer overflowed again.
Assuming this is correct the hardware buffer is the only thing I would like to understand better. If it overflows what error (if any) will be generated in LV?
The other questions can be chalked up to the way traditional DAQ functions work and I think I've chased my tail enough to figure that out.
Thanks,
David.
Attachments:
acquire.jpg ‏25 KB
acquire.vi ‏293 KB

Buffered Reader IO

Hi Friends,
Have a unusual problem.
I am trying to read a file using buffered reader api as:
testHandle = new BufferedReader(new FileReader("Test.DAT"));
but when i do
while(...){
String line = testHandle.readLine();
System.out.println(line);
the output is :
My Name is Vishal.
ello
When in the file Test.DAT it is :
# My Name is Vishal.
Hello
and if i add * in the Test.DAT file like this
*# My Name is Vishal.
Hello
Then It prints
# My Name is Vishal.
ello
Not able to understand why it is skipping the first letter (zeroth character of every line from the file) .
Need your help on this.
Thanks,
Vishal

You must be skipping some character(s), which you're not showing in the code snippet you posted. File I/O doesn't just skip over them - so there must be a bug in your code which you have omitted here.

Buffered Reader or String Buffer size.

Hi.
Is it possible to limit the size of a Buffered Reader input from the keyboard to a specific number? how would one go about it?

I would like to limit the size of the buffered reader to ensure a minimum or maxim number of input is put in. I tried using the ensureCapacity class but there seems to be a problem in calling the class. the code is below
import java.io.*;
import java.awt.*;
public class getUserString {
     public static void main (String [] args) throws Exception {
          int levl, x, load;
          String s1, s2;
          String input = " ";
          StringBuffer buf = new StringBuffer();
          System.out.println ("Enter a string of at least 4 characters");
          System.out.println ("Please do not enter a character more than once");
          BufferedReader mark = new BufferedReader(new InputStreamReader(System.in));
          mark.ensureCapacity(4);
          try{
               s1 = mark.readLine();
               System.out.println ("These are the characters you have entered: " + s1);
          catch(IOException e) {
                e.printStackTrace();
}

HELP - Buffered Reader

Below is a portion of my program, its a simple app, that is supposed to read a policy number, and then display the results. I can't get it to read the file, or output onto the app. Any help would be appreciated.
the file is called loans.txt and a line looks like this...
12322|Smith, Dennis|456 Westfield Blvd|Westfield, IN 46033|$2,500|1/1/2001|7/11/2005|None
public void GetFile(){
//User's entered policy number is stored here
String Policy_Num_Entered = SearchFor.getText();
/*If the the policy is found in loans.txt, sucess will be changed to 1,
otherwise it will stay 0 and be used to output a "I'm Sorry message*/
int sucess = 0;
//Try Catch Block
try{
BufferedReader br = new BufferedReader(new FileReader(file));
//Access the first line of loans.txt
String line = br.readLine();
//Read the # of lines in loans.txt
LineNumberReader read = new LineNumberReader(new FileReader(file));
//Assign the # of lines to count
int count = read.getLineNumber();
//Item being looked by the String Tokenizer
String Item;
//For loop, looping the # of times a line must be read
for(int x = 0; x < count; x++){
//While Line is not empty, proceed
while ( line != null )
//Read individual words of the line from loans.txt
StringTokenizer tokenizer = new StringTokenizer(line, "|");
Item = tokenizer.nextToken();
//While the line has more words
while(tokenizer.hasMoreTokens() )
//If Word equals "The" add 1 tot he sum
if(Item == Policy_Num_Entered){
//Fill in policy Number
Policy_Number.append(Item);
Item = tokenizer.nextToken();
//Fill in First and Last Name
Name.append(Item);
//Item = tokenizer.nextToken();
//Name.append(" " + Item);
Item = tokenizer.nextToken();
//Fill in Address
Address.append(Item);
Item = tokenizer.nextToken();
//Address.append(" " + Item);
//Item = tokenizer.nextToken();
//Address.append(" " + Item);
//Item = tokenizer.nextToken();
//Fill in City, State and Zip Code
City_St_Zip.append(Item);
Item = tokenizer.nextToken();
//City_St_Zip.append(" " + Item);
//Item = tokenizer.nextToken();
//City_St_Zip.append(" " + Item);
//Item = tokenizer.nextToken();
//Fill in Loan Balance
LoanBal.append(Item);
Item = tokenizer.nextToken();
//Fill in Loan Effective Date
LoanEffDate.append(Item);
Item = tokenizer.nextToken();
//Fill in Maturity Date
MatDate.append(Item);
Item = tokenizer.nextToken();
//Take all the words that are left to fill in Notes
//while(tokenizer.hasMoreTokens() ){
Notes.append(" " + Item );
Item = tokenizer.nextToken();
//end of while has more tokens
//Item found so change to 1
sucess = 1;
//Break out of the loop
break;
}//end of If
//Grab the next word
Item = tokenizer.nextToken();
}//end of while tokenizer
}//end of while
//Read the next line
line = br.readLine();
}//for loop
if(sucess == 0)
JOptionPane.showMessageDialog(Finalapp.this, "I'm sorry the Policy " +
Policy_Num_Entered + " was not found. Please try "+
"again.");
//Close the buffered Reader, and close the .dat file
br.close();
}//End of try
//Catch any errors that may have occured in the reader
catch(IOException exception)
exception.printStackTrace();
}//end of catch
}//end of GetFile

Ok I know that my line reader was messing up, so it was never running the loop, my new code reads like this...
public void GetFile(){
//User's entered policy number is stored here
String Policy_Num_Entered = SearchFor.getText();
/*If the the policy is found in loans.txt, sucess will be changed to 1,
otherwise it will stay 0 and be used to output a "I'm Sorry message*/
int sucess = 0;
//Try Catch Block
try{
BufferedReader br = new BufferedReader(new FileReader("loans.txt"));
/*FileInputStream file = new FileInputStream("c:\\loans.txt");
BufferedReader br = new BufferedReader( new InputStreamReader( file) );*/
//Access the first line of loans.txt
String line = br.readLine();
//Read the # of lines in loans.txt
LineNumberReader read = new LineNumberReader(new FileReader("loans.txt"));
//Assign the # of lines to count
int count = 7;//read.getLineNumber();
Policy_Number.append(count + " ");
//Item being looked by the String Tokenizer
String Item = null;
//For loop, looping the # of times a line must be read
for(int x = 0; x < count; x++){
//While Line is not empty, proceed
while ( line != null )
//Read individual words of the line from loans.txt
StringTokenizer tokenizer = new StringTokenizer(line, "|");
Item = tokenizer.nextToken();
//While the line has more words
while(tokenizer.hasMoreTokens() )
//If Word equals "The" add 1 to the sum
if(Item == Policy_Num_Entered){
//Fill in policy Number
Policy_Number.append(Item);
Item = tokenizer.nextToken();
//Fill in First and Last Name
Name.append(Item);
Item = tokenizer.nextToken();
//Fill in Address
Address.append(Item);
Item = tokenizer.nextToken();
//Fill in City, State, ZIp Code
City_St_Zip.append(Item);
Item = tokenizer.nextToken();
//Fill in Loan Balance
LoanBal.append(Item);
Item = tokenizer.nextToken();
//Fill in Loan Effective Date
LoanEffDate.append(Item);
Item = tokenizer.nextToken();
//Fill in Maturity Date
MatDate.append(Item);
Item = tokenizer.nextToken();
//Take all the words that are left to fill in Notes
Notes.append(" " + Item );
Item = tokenizer.nextToken();
//Item found so change to 1
sucess = 1;
//Break out of the loop
break;
}//end of If
//Grab the next word
Item = tokenizer.nextToken();
}//end of while tokenizer
//Read the next line
line = br.readLine();
}//end of while
}//for loop
if(sucess == 0)
JOptionPane.showMessageDialog(Finalapp.this, "I'm sorry the Policy " +
Policy_Num_Entered + " was not found. Please try "+
"again.");
//Close the buffered Reader, and close the .dat file
br.close();
}//End of try
//Catch any errors that may have occured in the reader
catch(IOException exception)
exception.printStackTrace();
}//end of catch
}//end of GetFile

Buffered reader / data inputstream

I need to find out how to enter array numbers in from the keyboard
i think it might be by using buffered reader, but i dont know th exact code can
anybody help me!
Cheers

Do you need to keep array of numbers?
It's simply and not powerfull solution:
import java.io.*;
import java.util.Vector;
public class test
public static void main (String argv[])
BufferedReader theIn = new BufferedReader (new InputStreamReader (System.in));
int nValue;
int nSumma = 0;
Vector theItems = new Vector (0, 10);
while (true)
try
nValue = Integer.parseInt (theIn.readLine ());
nSumma += nValue;
theItems.addElement (new Integer (nValue));
catch (Exception e)
break;
System.out.println ("Summa: " + nSumma);
}

Buffered Reader question.

I am writing a program that reads data from multiple text files.
When the program would need to read data from a different file I just reasigined the Buffered Reader object. For example:
reader = new BufferedReader(new FileReader(new File(<name of first file>)));
reader = new BufferedReader(new FileReader(new File(<name of second file>)));
Is this a good method to use, or is it better to instanciate a new buffered reader object for each file?

It is fine, the old reader will be GCed after a while.
However, you might want to close the stream before just dumping the old one, as OSes have a limit on the number of files an app can open at one time. Plus it might leave the file locked, so other apps can not use said file.

Buffered Reader Question about wrapping around another Reader

I'm reading about BufferedReaders and in the API the following paragraph reads:
In general, each read request made of a Reader causes a corresponding read request to be made of the underlying character or byte stream. It is therefore advisable to wrap a BufferedReader around any Reader whose read() operations may be costly, such as FileReaders and InputStreamReaders. For example,
BufferedReader in = new BufferedReader(new FileReader("foo.in"));
I was wondering if somebody could explain their reasoning in slightly less complicated terms...I can't really figure out what their reasoning is. Thanks

If every time you wanted to read a character, you had to talk to the hard disk device, it would be very slow. This is because communicating with the disk is thousands of times slower than communicating with main memory.
The buffered reader reads in chunks, buffers those data, and allows you to request them one character at a time.

Buffered Reader from a JTextArea?

Hi everyone,
can anyone please tell me how i can get a buffered reader from a JTextArea? This is what I would like to do where the following gets displayed in the JTextArea
Please enter your name: (user enters data here)
Please enter your id number: (user enters id number here)
I had coded this using the System.in but now trying to convert to a GUI
Regards,
M

Hi there,
I can't use get text as I will already have the other data that is written in the text area there as well, so it will get all the text. I need to be able to write stuff and then read the next line from what I have written. For example using my the command prompt:
static BufferedReader br = new BufferedReader(
                                                 new InputStreamReader(System.in));
System.out.print("Enter choice : ");
            System.out.flush();
            String choiceStr=null;
            try
                choiceStr = br.readLine();
            } catch (IOException ioe)
                System.out.println("Error reading choice.");
                System.exit(1);
            int choice = -1;
            if (choiceStr.length() > 0)
                choice = Integer.parseInt(choiceStr);
            switch (choice)
                case 0: ....
            }On screen it would have wrote Enter choice: (user puts "7" )
when the 7 and then /r is pressed then it will read in the 7 only.
Thanks, M

Buffered reader need help

Hello!
I'm useless at java and am trying to complete a piece of code i just don't get!
I'm reading in a text file and don't know how to complete the buffered reader section of it can anyone help!
p
the code is as follows.
// Author:
// Date:
// The creation of the League class
// saved as League.java to hold and manipulate icehockey team data
import java.io.*;
import java.lang.*;
import java.util.*;
class League
private static Team teams[]=new Team[6];
League()
String tName;
String tNickname;
String nPlayed;
String nWon;
String nLost;
String nDrawn;
try
FileReader fr=new FileReader("Results.txt");
//got the following syntax from p436
BufferedReader br=new BufferedReader(fr);
//confused!!!!
int i=0;
while()
// dunno if this is right!
StringTokenizer st = new StringTokenizer(fr);
while (st.hasMoreTokens())
//will this work?
tName=inputStream.sval;inputStream.nextToken();
tNickname=inputStream.sval;inputStream.nextToken();
nPlayed=(int)inputStream.nval;inputStream.nextToken();
nWon=(int)inputStream.nval;inputStream.nextToken();
nLost=(int)inputStream.nval;inputStream.nextToken();
nDrawn=(int)inputStream.nval;inputStream.nextToken();
//whats this bit about? new team instance to be written!
//teams=;
i++;
fr.close();
br.close();
//catch exception thing wrote this dunno if it works or not
catch (Exception e)
if (e instanceof FileNotFoundException)
system.out.println("Filename"+Results.txt+"not found")
     //     public int getSize()
               //to be written
     //     public Team getTeam(int i)
               //to be written

try somethign along these lines...
    try {
        BufferedReader in = new BufferedReader(new FileReader("infilename"));
        String str;
        while ((str = in.readLine()) != null) {
            process(str);
        in.close();
    } catch (IOException e) {
    }

Image reading problem in servlet

Image reading problem in servlet
I am reading an image in servlet and writing it to ServletOutputStream
The following code works fine unless I change the size of the byte array (for increasing download speed) from 8 to something like 128 or any other higher value
If I change the value of byte array size the image does not get downloaded properly, I mean the quality of the image changes, it does not looks like the original imageURL url = new URL("http://www.mysite.com/images/img1.jpg");
URLConnection con = url.openConnection();
con.setUseCaches(false);
BufferedInputStream in = new BufferedInputStream(con.getInputStream());
BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());
byte b[] = new byte[8];
while(in.read(b) != -1)
     out.write(b);
     out.flush();
out.close();
in.close();what do I change
byte array size
or use the constructor of BufferedInputStream with 2 parameter
or use the constructor of BufferedOutputStream with 2 parameter
or use flush outside while loop or what else

Change your while loop to:
int count;
while((count = in.read(b)) != -1)
     out.write(b, 0, count);
     out.flush();
}The penultimate time read is called, it may not fill the entire byte array. You only want to write out however much was read into the array.
For better performance, you should move the flush() outside of the loop too. BufferedOutputStream will flush automatically when its internal buffer is full.

Telnet read problem -- Telnet read back

I am trying to use telnet to send TL1 command to my UUT and expect to read back measurement data. I was able to read proper data once in a while but most of the time I read back the TL1 command that I sent. I tried different read mode and timeout period but nothing seem to matter. My vi was written in Labview 8.2.1 with Internet toolkit. I read in the forum about some limitation of the telnet read problem of the vi from the internet toolkit, Is there any better read driver around?
Thanks,
Patrick

Hey! I have a few questions for you that should help us solve this problem. First, have you tried out the telnet shipping example "Telnet Line Client.vi". This will help us minimize programming errors, etc. Also, what type of device are you trying to communicate with? Are there other forms of communication available? For example, does the device also have a serial port, GPIB Port, etc.? Also, is it possible to write to the device using TCP/IP (This is what telnet is based on)? Let me know the answers to these questions and I will be better equipped to help you out!!
Thanks!
Dan
Daniel Eaton
National Instruments
Systems Engineering
Embedded and Industrial Control

How get output generated as csv file by reading by buffered reader and wr

how get output generated as csv file by reading by buffered reader and writer

String file_location = "C\temp\csv.txt");
try {
     URL fileURL = getClass().getResource(file_location);
     if (fileURL != null){
          BufferedReader br = new BufferedReader(new InputStreamReader(fileURL.openStream()));
          String s = br.readLine();
          while (s != null) {
               if (!s.equals ("")) {
                    System.out.println(s);
               s = br.readLine();
          br.close();
     else {
          // error
catch (IOException ex){ex.printStackTrace();}rykk
Message was edited by: a dummy
rykk.

T 420s cooling air coming out is very hot, finger print reader problem

I am living in ruwais, abudhabi.i bought T 420s in last June from LENOVO authorized distributor. Model number is 4174-KK4 and the sr no ***.
Sometime the cooling air coming out is very hot, unable to keep the laptop on the lap.
The cooling fan also replaced still the temperature is high.
After replacing the fan I noticed that I noticed one of the screws was not fixed, I asked them to fix it, then they fixed it.
I traveled back to my home 240 KM from the authorized distributor service center. when I started the laptop, the fingerprint reader was not working . Then I traveled back 240 KM to the authorized distributor service center to fix the issue. They fixed the fingerprint reader problem.
Then now the SD card reader is not working. I was asked to bring the laptop to the authorized distributor service centre.
Can any one experience the same type of problems with T 420s the cooling air coming out is very hot, finger print reader problem, card reader not working?
The authorized distributor says for the service they can only cover 50 KM form the authorized distributor service center to the customer point, what is the conditions for the On site warranty ?. I am living 240 KM away from the authorized distributor service center from whom I bought the laptop.
Moderator comment: Serial number(s) removed to protect member from mischief.

Well clearly after the first incident. You need to check and us it verifying everything is working before leaving the service center or town its in. Go to a coffee shop and spend time using it and test each option is working.
When the notebook its opened the finger print reader, card reader etc may not be connect properly or connectors not snap fully and disconnect. Mouse ultranav I have heard may also. But clearly you assume too much and you need to spend the time testing its working before leaving.
These service center are only paid a fixed amount so they won't spend anymore time then they have to and address one problem you brought it in for.
As for heat out put and over heating. There are many threads on these systems you can find and read about.
Advice:
- install Core Temp, this will monitor and display on the task bar you CPU core temp and you can see CPU load & Temperature at a glance if it approaching or staying near the max levels which will kill the CPU and/or motherboard due to cooking it. Its free just be sure to deselect any additional software from installing during the process. I use it on my notebooks. If the system is running high core Temp all the time you need to have it resolved or it will die and most likely out of warranty and/or your data will be lost if you don't have a backup as well. http://www.alcpu.com/CoreTemp/
- use a laptop cooler. Its a flat pad you sit the laptop on you lap or table with usually two cooling fans that plug into the USB port for power. It will help cool the base of the laptop and other components inside will not be as hot. This will do nothing for the CPU temperature though.
T520 Model 4239 Intel(R) Core(TM) i7-2860QM CPU @ 2.50GHz
Intel Sandy Bridge & Nvidia NVS 4200M graphics Intel N 6300 Wi-Fi adapter
Windows 7 Home Prem - 64bit w/8GB DDR3

I am unable to print documents. States Adobe reader problem

I cannot print documents as it says Adobe reader problem or error

Windows 7; HP 2009m; printer is Lexmark S415;
Message says
Acro RD32.exe
Adobe PDF document
(There is a problem with Adobe Adrobat/Reader. If it is running, please
exit and try again. (15:3)

Buffered reader problem

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