Help!Working with bits
Hi all!
First of all sorry, because my email is too long :(
I'm trying to make read/write operations with bits buy I'm going mad. That's my problem:
I have a file called "doubles.bin" which stores numbers in double format and I need to read every data in that file, take a number of bits specified by the user and create a file with those new data,that is:
doubles.bin : ...
_1000001000001011100000_111110000000000000000000000000000000000000
num_bits_to_read = 22
new.bin: ...
1000001000001011100000
I've tried with different libraries:
BitSet ,
[java.lang.Object-> BitInputStream|http://www.iu.hio.no/~ulfu/appolonius/e-bok/vedleggA/BitInputStream.html],
[org.kc7bfi.jflac.io.BitOutputStream|http://jflac.sourceforge.net/apidocs/org/kc7bfi/jflac/io/BitOutputStream.html#writeRawULong(long,%20int)]
and the last one seems to be the most useful but I'm not sure how exactly wotks the method "writeRawULong"
so, the questions are:
1. What do you think is the most efficient library or way to solve this?
2. Does anybody know what exactly does the method "writeRawULong(long val, int bits)" of the last library?
Any help would be apreciated!
platters wrote:
jverd wrote:
Is this a text file, with the ASCII character 11010011 etc.? Or is it a binary file?
What format is it in? Not "text" or "binary". Rather, in addition to it being text or binary, which specific textual or binary format was used to encode the values? How did the file get written in the first place?"doubles.bin" has been created using the writeDouble method in class DataOutputStream, so values are stored according to the IEEE 754 floating-point "double format" bit layout.So just read it with readDouble() then.
>
>>
What specific problems are you having? "Not perfect" contains no useful information.Ok, I'm gonna try to explain well the problem.
I want to read from that "doubles.bin" each data in long format Why long format? Why not double format, since that's what you wrote it with. But if you want long format, use readLong. Every valid double is also a valid long, BUT the values will be very different. 1.0 in double will NOT be 1 in long, and 123.456 will not just be rounded to 123. They're totally different formats.
and create a new file which stores n-bits of each data read in order to create a smaller file.Huh???
The problem is that I have to create an image with the modified data and I've noticed that when the number of bits I read from each original data is multiple of 8 the image is ok but in the other case there is noise. Well, you can't just trim out arbitrary bits and expect it still to be meaningful. Have you studied up in [IEEE-754|http://en.wikipedia.org/wiki/IEEE_754]? Which bits will you strip out, and what will you replace them with when you reconstruct your double or long or whatever you're ultimately after.
I must admit, I have no clue what you're actually trying to accomplish.
Similar Messages
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I hawe working DES code that works with Strings. But I need it to work with bits (key, plaintext and encrypted text in bit format). Witch is the best way to do it if it is possible. Or maybe do it in other language.
import java.io.UnsupportedEncodingException;
import javax.crypto.*;
public class DESEncrypter {
Cipher ecipher;
Cipher dcipher;
DESEncrypter(SecretKey key) {
try {
ecipher = Cipher.getInstance("DES");
dcipher = Cipher.getInstance("DES");
ecipher.init(Cipher.ENCRYPT_MODE, key);
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} catch (java.security.NoSuchAlgorithmException e) {
} catch (java.security.InvalidKeyException e) {
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} catch (java.io.IOException e) {
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ThanksExceptions are fixed. Code looks much better.
Now I'm looking for some fast algorithm that could run throu all bit combinations from 0 to 2 ^64^ -1 and to write them in byte[8]. In beginig with 1 +"1"+ from all 64 bits, then 2 +"1"+, 3 +"1"+ and so on to 64 +"1"+.
My previous code:
public void runAll() throws IllegalBlockSizeException, BadPaddingException, SQLException, ClassNotFoundException{
byte[] pt = new byte[8];
byte[] et = new byte[8];
int ptbc, etbc;
SQLoutput sqlout = new SQLoutput();
sqlout.createTables();
for(int n00=-128;n00<128;n00++){
pt[0] = (byte)n00;
for(int n01=-128;n01<128;n01++){
pt[1] = (byte)n01;
for(int n02=-128;n02<128;n02++){
pt[2] = (byte)n02;
for(int n03=-128;n03<128;n03++){
pt[3] = (byte)n03;
for(int n04=-128;n04<128;n04++){
pt[4] = (byte)n04;
for(int n05=-128;n05<128;n05++){
pt[5] = (byte)n05;
for(int n06=-128;n06<128;n06++){
pt[6] = (byte)n06;
for(int n07=-128;n07<128;n07++){
pt[7] = (byte)n07;
et = encrypt(pt);
ptbc = byteCount(pt);
etbc = byteCount(et);
sqlout.updtRec(etbc, ptbc);
}Edited by: Hugo.Knife on Dec 11, 2007 5:39 PM -
Improving the LabVIEW Help: Working with Data Types
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A numerous amount of songs that have been released in the past few months have had these deep and long basslines. Ive been working with logic trying to figure out what the trick is behind creating this sound, but I don't think it has to do with sidechaining, but I would really appreciate it if anyone could fill me in on what the trick is. Here are 2 sample tracks.
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I have tried doing each line individually, leaving the <base target> in and taking it out.
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This is what I have, using the forceframe:
<head>
<meta http-equiv="content-type" content="text/html;charset=iso-8859-1">
<meta name="generator" content="Adobe GoLive 6">
<title>Welcome to Adobe GoLive 6</title>
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<csaction name="609B1923" class="FrameMaker" type="onevent" val0="clearance1.html" val1="Body" urlparams="1"></csaction>
<csaction name="606FEA72" class="FrameMaker" type="onevent" val0="clearance1.html" val1="Body" urlparams="1"></csaction>
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<csaction name="716388D6" class="FrameMaker" type="onevent" val0="clearance1.html" val1="Body" urlparams="1"></csaction>
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<csscriptdict import>
<script type="text/javascript" src="GeneratedItems/CSScriptLib.js"></script>
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<csactiondict>
<script type="text/javascript"><!--
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CSAct[/*CMP*/ '609B1923'] = new Array(frameP,/*URL*/ 'clearance1.html','Body');
CSAct[/*CMP*/ '606FEA72'] = new Array(frameP,/*URL*/ 'clearance1.html','Body');
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<td width="5" height="24"> 2 </td>
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</body>
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If someone could please help I would be so appreciative!!!!! Thanks!Hi,
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<csaction name="606FEA72" class="FrameMaker" type="onevent" val0="cases.html" val1="Body" urlparams="1"></csaction>
<csaction name="71581815" class="FrameMaker" type="onevent" val0="/clearance1.html" val1="Body" urlparams="1"></csaction>
<csaction name="716388D6" class="FrameMaker" type="onevent" val0="clearance1.html" val1="Body" urlparams="1"></csaction>
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<csscriptdict import>
<script type="text/javascript" src="GeneratedItems/CSScriptLib.js"></script>
</csscriptdict>
<csactiondict>
<script type="text/javascript"><!--
CSAct[/*CMP*/ '5F8BE850'] = new Array(frameP,/*URL*/ 'audio-consoles.html','Body');
CSAct[/*CMP*/ '609B1923'] = new Array(frameP,/*URL*/ 'accessories-f.html','Baby');
CSAct[/*CMP*/ '606FEA72'] = new Array(frameP,/*URL*/ 'cases.html','Body');
CSAct[/*CMP*/ '71581815'] = new Array(frameP,/*URL*/ '/clearance1.html','Body');
CSAct[/*CMP*/ '716388D6'] = new Array(frameP,/*URL*/ 'clearance1.html','Body');
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</csactiondict>
</head>
<body background="Images/bgd.gif" bgproperties="fixed" link="#7b00ff" vlink="#7b00ff" alink="#7b00ff">
<table width="232" border="2" cellspacing="2" cellpadding="0">
<td width="200" height="24">
<div align="left">
<b><a title="accessories-f.html" onclick="CSAction(new Array(/*CMP*/'609B1923'));return CSClickReturn();" href="accessories-f.html" target="Baby" csclick="609B1923">Accessories</a></div>
</td>
<td width="5" height="24"> 4 </td>
</tr>
<tr><td width="200" height="24">
<div align="left">
<b><a title="audio-consoles.html" onclick="CSAction(new Array(/*CMP*/'5F8BE850'));return CSClickReturn();" href="audio-consoles.html" target="Body" csclick="5F8BE850">Audio Consoles</a></div>
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<td width="5" height="24"> 3 </td>
</tr>
<tr><td width="200" height="24">
<div align="left">
<b><a title="cases.html" onclick="CSAction(new Array(/*CMP*/'606FEA72'));return CSClickReturn();" href="cases.html" target="Body" csclick="606FEA72">Cases</a></div>
</td>
<td width="5" height="24"> 2 </td>
</tr>
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Jobtitles-----ADRole1----- AdRole2
title1---------Role1---------Role4
title2---------Role2---------Role5
title2---------Role3--------Role6
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I do it like:
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get-aduser $user.loginname -properties title, samaccountname
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With these issues, it is a little difficult to determine what actually happens in the following code.
I'd suggest you give it another try then copy/paste the complete code for us to comment on.
Al Dunbar -- remember to 'mark or propose as answer' or 'vote as helpful' as appropriate. -
Script Help - Working with Files - Reading/Writing
Hey Folks,
I need help build a script that will read a text string from a specific .INI file, and then write that string to a file along with the name of the computer where the string originated from.
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I
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$enddate = (Get-Date).tostring("yyyyMMdd")
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$filename
The developer of a core piece of software requires all computers have a unique ID, but provides absolutely no tools or guidance for tracking this crucial information. Any input you can provide will be greatly appreciated!
Please help us fix this nightmare! Thank you in advance!I am trying to add a step where the script grabs a list of all domain workstations and saves it to a file. This file is then used as the input for the rest of the script. There is a problem with the way the computers names are imported using this method.
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Get-ADComputer -Filter * | select name | Out-File \\Server\C$\DJs\complist.csv
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Get-Content '\\Server\C$\DJs\complist.csv' |
ForEach-Object {
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$djnumber=$devicename -replace "devicename=","`t"
$prize=$_ += $djnumber
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The problem is that the computer names include a ton of blank spaces if I use Out-File in the line:
#Save a list of all current AD computers
Get-ADComputer -Filter * | select name | Out-File \\Server\C$\DJs\complist.csv
Error looks like this:
get-content : Cannot find path '\\CM112233
\C$\Users\Public\Software\myfile.ini' because it does
not exist.
At line:11 char:13
+ $devicename=get-content "\\$_\C$\Users\Public\Software\...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : ObjectNotFound: (\\CM112233 ...ction\myfile.ini:String) [Get-Content], ItemNotFoundException
+ FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.GetContentCommand
If I use Export-Csv, it puts ""'s around the computer names and that breaks it as well.
#Save a list of all current AD computers
Get-ADComputer -Filter * | select name | Export-Csv \\Server\C$\DJs\complist.csv
This is the error:
get-content : Illegal characters in path.
At line:11 char:13
+ $devicename=get-content "\\$_\C$\Users\Public\Software\ ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (\\"CM112233"\C$\U...are\myfile.ini:String) [Get-Content], ArgumentException
+ FullyQualifiedErrorId : ItemExistsArgumentError,Microsoft.PowerShell.Commands.GetContentCommand -
Help working with sockets, please
hi
i've managed to do some applications similar to chat programs, and i would like to know if my design is... acceptable
my problem used to be that any function trying to read data from a socket would block until it gets some data. if my applicacion is like a chat, i don't know when data is arriving.
so my solution is:
create a thread, which would be always reading the input stream from the socket. whenever it gets data, it send an event which listened by the main class, say, a JFrame.
so i created my own events, listener and listenermulticaster. well it works great but i wonder if there is another simpler way to do it.
another think that bothers me:
when i have my thread with my connected socket, and i want to shut the appz down, the only way i've found is to close the socket. the thread must be able to manage that, and afterwards, returns from run function.
well what do u think about all of this?? i would be very grateful for any opinion you tell me
thanks in advancea reference to the thread, calls that method. the
socket is closed, the main loop breaks (i dont
remember now if an exception is thrown) and the thread
ends
i agree, i dont like this and it seems unreliable.
about the method interrupt, what is the diference from
retunrning from run method??
thanks very much for your help!!you will have a method that is reading from the Socket, it will block until some data is available
closing the Socket (one would hope) should cause that method to throw an Exception, you can use that Exception to exit the run() method, but if the Socket is closed from the other end, then it seems unreliable that the Exception is thrown, leavin the read method waiting for data that it can never recive
Thread.interrupt() will terminate all such blocking IO methods and you can use this also to exit the run() method
belt and braces maybe, but handy all the same -
Program Help, working with spaces and only letters
I'm writing a program that takes an input string and gets the length and/or gets the number of vowels and consonants in the string. I've gotten it working except for consideration of spaces (which are allowed) and error checking for input other than letters. Here is what I've got so far. ANY suggestions would be greatly appreciated. Thank You
import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class LetterStringManip extends JFrame
{//declaring variables
private JLabel stringOfLettersL, lengthL, lengthRL, vowelsL, vowelsRL, consonantsL, consonantsRL;
private JTextField stringOfLettersTF;
private JButton lengthB,vowelB, quitB;
private LengthButtonHandler lbHandler;
private VowelButtonHandler vbHandler;
private QuitButtonHandler qbHandler;
private static final int WIDTH = 750;
private static final int HEIGHT = 150;
public LetterStringManip()
{// setting up GUI window with buttons
stringOfLettersL = new JLabel("Enter a String of Letters", SwingConstants.CENTER);
lengthL = new JLabel("Length of String: ", SwingConstants.CENTER);
lengthRL = new JLabel("", SwingConstants.LEFT);
vowelsL = new JLabel("Number of Vowels: ", SwingConstants.CENTER);
vowelsRL = new JLabel("", SwingConstants.LEFT);
consonantsL = new JLabel("Number of Consonats: ", SwingConstants.CENTER);
consonantsRL = new JLabel("", SwingConstants.LEFT);
stringOfLettersTF = new JTextField(15);
lengthB = new JButton("Length");
lbHandler = new LengthButtonHandler();
lengthB.addActionListener(lbHandler);
vowelB = new JButton("Vowels");
vbHandler = new VowelButtonHandler();
vowelB.addActionListener(vbHandler);
quitB = new JButton("Quit");
qbHandler = new QuitButtonHandler();
quitB.addActionListener(qbHandler);
setTitle("String Of Letters");//Window title
Container pane = getContentPane();
pane.setLayout(new GridLayout(3,4)); //Window layout
pane.add(stringOfLettersL);
pane.add(stringOfLettersTF);
pane.add(lengthL);
pane.add(lengthRL);
pane.add(vowelsL);
pane.add(vowelsRL);
pane.add(consonantsL);
pane.add(consonantsRL);
pane.add(lengthB);
pane.add(vowelB);
pane.add(quitB);
setSize(WIDTH, HEIGHT);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}//closes public LetterStringManip()
private class LengthButtonHandler implements ActionListener
public void actionPerformed(ActionEvent e)//Length Button is clicked, getLength() method is performed
getLength();
}//closes public void actionPerformed(ActionEvent e)
}//closes private class LengthButtonHandler implements ActionListener
private class VowelButtonHandler implements ActionListener
public void actionPerformed(ActionEvent e)//Vowels Button is clicked, getVowels() method is performed
getVowels();
}//closes public void actionPerformed(ActionEvent e)
}//closes private class VowelButtonHandler implements ActionListener
private class QuitButtonHandler implements ActionListener//Quit Buttton is pressed
public void actionPerformed(ActionEvent e)
System.exit(0);
}//closes public void actionPerformed(ActionEvent e)
}//closes private class QuitButtonHandler implements ActionListener
public void getLength()//gets the length of the string
String letString = (stringOfLettersTF.getText());
String lengthString;
int length;
length = letString.length();
lengthString = Integer.toString(length);
lengthRL.setText(lengthString);
}//closes public void getLength()
public void getVowels()//gets the number of vowels in the string
String letString = (stringOfLettersTF.getText());
String vowString;
String conString;
int countVow = 0;
int countCon = 0;
int i;
int length = letString.length();
char[] letter = new char[length];
for (i = 0; i < letString.length(); i++)
letter[i] = letString.charAt(i);
if (letter=='a' || letter[i]=='e' || letter[i]=='i' || letter[i]=='o' || letter[i]=='u')
countVow++;
}//closes for
countCon = letString.length() - countVow;
vowString = Integer.toString(countVow);
conString = Integer.toString(countCon);
vowelsRL.setText(vowString);
consonantsRL.setText(conString);
}//closes public void getVowels()
public static void main(String[] args)
LetterStringManip stringObject = new LetterStringManip();
}// closes public static void main(String[] args)
}//closes public class LetterStringManip extends JFrameOK, per the instructions above: I will re-post my code that I have now. I have dealt with the space not being counted now, I only need to figure out how to validate my input so that only letters are allowed. If anyone has any suggestions, or can help me out in any way, it'd be great. The suggestions with creating word and sentence objects is still a little beyond what we have gone over thus far in my Java course, I feel like I can almost grasp it to code it, but end up getting really confused. anyways, hear is my 'crude' code so far:
public void getLength()
String letString = (stringOfLettersTF.getText());
String lengthString;
int finalLength;
int countSpace = 0;
int length = letString.length();
char[] letter = new char[length];
int i;
for (i = 0; i < letString.length(); i++)
letter[i] = letString.charAt(i);
if (letter==' ')
countSpace++;
finalLength = length - countSpace;
lengthString = Integer.toString(finalLength);
lengthRL.setText(lengthString);
public void getVowels()
String letString = (stringOfLettersTF.getText());
String vowString;
String conString;
int countVow = 0;
int countCon = 0;
int countSpace = 0;
int i;
int length = letString.length();
char[] letter = new char[length];
for (i = 0; i < letString.length(); i++)
letter[i] = letString.charAt(i);
if (letter[i]=='a' || letter[i]=='e' || letter[i]=='i' || letter[i]=='o' || letter[i]=='u')
countVow++;
if (letter[i]==' ')
countSpace++;
countCon = (letString.length() - countVow) - countSpace;
vowString = Integer.toString(countVow);
conString = Integer.toString(countCon);
vowelsRL.setText(vowString);
consonantsRL.setText(conString);
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