[iText][1] is a great Java PDF library. They also have an API for creating barcodes. You don&#39;t need to be creating a PDF to use it.

This page has the details on [creating barcodes][2]. Here is an example from that site:

    BarcodeEAN codeEAN = new BarcodeEAN();
    codeEAN.setCodeType(codeEAN.EAN13);
    codeEAN.setCode(&quot;9780201615883&quot;);
    Image imageEAN = codeEAN.createImageWithBarcode(cb, null, null);

The biggest thing you will need to determine is what type of barcode you need. There are many different barcode formats and iText does support a lot of them. You will need to know what format you need before you can determine if this API will work for you.


  [1]: http://www.lowagie.com/iText/
  [2]: http://itextdocs.lowagie.com/tutorial/objects/images/tiff/index.php

There is also this free API that you can use to make free barcodes in java.

[Barbecue][1]


  [1]: http://barbecue.sourceforge.net/

There is a free library called [barcode4j][1]


  [1]: http://barcode4j.sourceforge.net/

[ZXing][1] is a free open source Java library to read and generate barcode images. You need to get the source code and build the jars yourself. Here&#39;s a [simple tutorial][2] that I wrote for building with ZXing jars and writing your first program with ZXing.

[http://www.vineetmanohar.com/2010/09/java-barcode-api/]


  [1]: http://code.google.com/p/zxing/
  [2]: http://www.vineetmanohar.com/2010/09/java-barcode-api/

I use 
[barbeque][1]
, it&#39;s great, and supports a very wide range of different barcode formats.  
See if you like 
[its API][2]
.

Sample API:

&lt;pre&gt;public static &lt;a bitly=&quot;BITLY_PROCESSED&quot; href=&quot;../../../net/sourceforge/barbecue/Barcode.html&quot; title=&quot;class in net.sourceforge.barbecue&quot;&gt;Barcode&lt;/a&gt; &lt;b&gt;createCode128&lt;/b&gt;(java.lang.String&amp;nbsp;data)
                             throws &lt;a bitly=&quot;BITLY_PROCESSED&quot; href=&quot;../../../net/sourceforge/barbecue/BarcodeException.html&quot; title=&quot;class in net.sourceforge.barbecue&quot;&gt;BarcodeException&lt;/a&gt;&lt;/pre&gt;

&gt;  Creates a Code 128 barcode that
&gt; dynamically switches between character
&gt; sets  to give the smallest possible
&gt; encoding. This will encode  all
&gt; numeric characters, upper and lower
&gt; case alpha characters and control
&gt; characters  from the standard ASCII
&gt; character set. The size of the barcode
&gt; created will be the  smallest possible
&gt; for the given data, and use of this
&gt; &quot;optimal&quot; encoding will  generally
&gt; give smaller barcodes than any of the
&gt; other 3 &quot;vanilla&quot; encodings.




  [1]: http://sourceforge.net/projects/barbecue/
  [2]: http://barbecue.sourceforge.net/apidocs/overview-tree.html

In vim, when I have a buffer open, I often need to load another file in the same directory that file is in, but since I don&#39;t usually `cd` into it, the `pwd` is a parent folder, so I have to retype the path every time. Is there a shortcut for this? or a way to change the pwd to the directory the file is in?

example:

    cd /src
    vi lib/foo/file.js

_lib/foo_ has two files: `file.js` and `file2.js`

in vi:
    
    :e file2.js  # doesn&#39;t work


Opening files in the same folder as the current file, in vim

I am currently working on a big project and maintaining all those include guards makes me crazy! Writing it by hand is frustrating waste of time. Although many editors can generate include guards this doesn&#39;t help much:

1. Editor generates guard symbol based on a filename. The problem occurs when you have headers with the same filename in different directories. Both of them will get the same include guard. Including directory structure into the guard symbol would require some fancy approach from the editor, since slashes and backslashes in the macro are not the best thing.

2. When I have to rename a file I should rename all the include guards as well (in the ifndef, define and ideally endif&#39;s comment). Annoying.

3. Preprocessor is flooded with tons of symbols without a clue what they mean.

4. Nevertheless definition is included once, compiler still opens header every time it meets header inclusion.

5. Include guards don&#39;t fit into namespaces nor templates. In fact they are subverting namespaces!

6. You have a chance that your guard symbol won&#39;t be unique.

Maybe they were acceptable solution in times when programs contained less than 1000 headers in single directory. But nowadays? It is ancient, it has nothing to do with modern coding habits. What bothers me the most is that this issues could be almost compeletly solved by #pragma once directive. Why is it not a standard?

Why isn&#39;t C/C++&#39;s &quot;#pragma once&quot; an ISO standard?

How can I create a barcode image in Java?  I need something that will allow me to enter a number and produce the corresponding barcode image.  Is there a free library available for this type of task?

BarCode Image Generator in Java

<p>How can I create a barcode image in Java?  I need something that will allow me to enter a number and produce the corresponding barcode image.  Is there a free library available for this type of task?</p>


When I look at the examples in the Assert class JavaDoc

    assertThat(&quot;Help! Integers don&#39;t work&quot;, 0, is(1)); // fails:
    // failure message:
    // Help! Integers don&#39;t work
    // expected: is &lt;1&gt; 
    // got value: &lt;0&gt;
    assertThat(&quot;Zero is one&quot;, 0, is(not(1))) // passes

I dont see a big advantage over, let&#39;s say, `assertEquals( 0, 1 )`.

It&#39;s nice maybe for the messages if the constructs get more complicated but do you see more advantages? Readability?



Why should I use Hamcrest-Matcher and assertThat() instead of traditional assertXXX()-Methods

IllegalStateException is often used in Java when a method is invoked on an object in inappropriate state. What would you use instead in Python?

Is there an analogue to Java IllegalStateException in Python?

I&#39;m trying to convert the `String`  `\something\` into the `String` `\\something\\` using `replaceAll`, but I keep getting all kinds of errors. I thought this was the solution:

    theString.replaceAll(&quot;\\&quot;, &quot;\\\\&quot;);

But this gives the below exception: 

    java.util.regex.PatternSyntaxException: Unexpected internal error near index 1


String.replaceAll single backslashes with double backslashes

Does the `ExecutorService` guarantee thread safety ? 

I&#39;ll be submitting jobs from different threads to the same ThreadPoolExecutor, do I have to synchronize access to the executor before interacting/submitting tasks?


Is ExecutorService (specifically ThreadPoolExecutor) thread safe?

I am getting Java exception like: 

    java.net.MalformedURLException: no protocol

My program is trying to parse an XML string by using:

    Document dom;
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    DocumentBuilder db = dbf.newDocumentBuilder();
    dom = db.parse(xml);

The XML string contains:

    String xml = &quot;&lt;?xml version=\&quot;1.0\&quot; encoding=\&quot;utf-8\&quot;?&gt;&quot;+
		&quot;	&lt;s:Envelope xmlns:s=\&quot;http://schemas.xmlsoap.org/soap/envelope/\&quot;&gt;&quot;+
		&quot;		&lt;s:Header&gt;&quot;+
		&quot;			&lt;ActivityId CorrelationId=\&quot;15424263-3c01-4709-bec3-740d1ab15a38\&quot; xmlns=\&quot;http://schemas.microsoft.com/2004/09/ServiceModel/Diagnostics\&quot;&gt;50d69ff9-8cf3-4c20-afe5-63a9047348ad&lt;/ActivityId&gt;&quot;+
		&quot;			&lt;clalLog_CorrelationId xmlns=\&quot;http://clalbit.co.il/clallog\&quot;&gt;eb791540-ad6d-48a3-914d-d74f57d88179&lt;/clalLog_CorrelationId&gt;&quot;+
		&quot;		&lt;/s:Header&gt;&quot;+
		&quot;		&lt;s:Body&gt;&quot;+
		&quot;			&lt;ValidatePwdAndIPResponse xmlns=\&quot;http://tempuri.org/\&quot;&gt;&quot;+
		&quot;			&lt;ValidatePwdAndIPResult xmlns:a=\&quot;http://schemas.datacontract.org/2004/07/ClalBit.ClalnetMediator.Contracts\&quot; xmlns:i=\&quot;http://www.w3.org/2001/XMLSchema-instance\&quot;&gt;&quot;+
		&quot;			&lt;a:ErrorMessage&gt;Valid User&lt;/a:ErrorMessage&gt;&quot;+
		&quot;			&lt;a:FullErrorMessage i:nil=\&quot;true\&quot; /&gt;&quot;+
		&quot;			&lt;a:IsSuccess&gt;true&lt;/a:IsSuccess&gt;&quot;+
		&quot;			&lt;a:SecurityToken&gt;999993_310661843&lt;/a:SecurityToken&gt;&quot;+
		&quot;			&lt;/ValidatePwdAndIPResult&gt;&quot;+
		&quot;			&lt;/ValidatePwdAndIPResponse&gt;&quot;+
		&quot;		&lt;/s:Body&gt;\n&quot;+
		&quot;	&lt;/s:Envelope&gt;\n&quot;;

Any suggestions about what is causing this error? 


java.net.MalformedURLException: no protocol

I am reading the Python cookbook at the moment and am currently looking at generators. I&#39;m finding it hard to get my head round.

As I come from a Java background, is there a Java equivalent? The book was speaking about &#39;Producer / Consumer&#39;, however when I hear that I think of threading.

What is a generator and why would you use it? Without quoting any books, obviously (unless you can find a decent, simplistic answer direct from a book). Perhaps with examples, if you&#39;re feeling generous!



Understanding generators in Python

Lets say I have two functions:

    def foo():
      return &#39;foo&#39;

    def bar():
      yield &#39;bar&#39;

The first one is a normal function, and the second is a generator function. Now I want to write something like this:

    def run(func):
      if is_generator_function(func):
         gen = func()
         gen.next()
         #... run the generator ...
      else:
         func()
         
What will a straightforward implementation of `is_generator_function()` look like? Using the `types` package I can test if  `gen` is a generator, but I wish to do so before invoking `func()`. 

Now consider the following case:

    def goo():
      if False:
         yield
      else:
         return

An invocation of `goo()` will return a generator. I presume that the python parser knows that the `goo()` function has a yield statement, and I wonder if it possible to get that information easily.

Thanks!

In python is there a way to check if a function is a &quot;generator function&quot; before calling it?

In Python, is there any difference between creating a generator object through a **generator expression** versus using the **yield** statement?

Using *yield*:

    def Generator(x, y):
        for i in xrange(x):
            for j in xrange(y):
                yield(i, j)

Using *generator expression*:

    def Generator(x, y):
        return ((i, j) for i in xrange(x) for j in xrange(y))

Both functions return generator objects, which produce tuples, e.g. (0,0), (0,1) etc.

Any advantages of one or the other? Thoughts?


  [1]: http://stackoverflow.com/questions/1995418/python-generator-expression-vs-yield/1995585#1995585

Python: generator expression vs. yield

This is not a homework, I am just curious.

INFINITE is the key word here.

I wish to use it as `for p in primes()`. I believe that this is a built-in function in Haskell.

So, the answer cannot be as naive as &quot;Just do a Sieve&quot;.

First of all, you do not know how many consecutive primes will be consumed. Well, suppose you could concoct 100 of them at a time. Would you use the same Sieve approach as well as the frequency of prime numbers formula?

I prefer non-concurrent approach.

Thank you for reading (and writing ;) )!


How to implement an efficient infinite generator of prime numbers in Python?

Is there a more syntactically concise way of writing the following?

    gen = (i for i in xrange(10))
    index = 5
    for i, v in enumerate(gen):
        if i is index:
            return v

It seems almost natural that a generator should have a ``gen[index]`` expression, that acts as a list, but is functionally identical to the above code.

Get the nth item of a generator in Python

Is there a decent free API/component for printing barcodes in C#?



Free Barcode API for .NET

I&#39;ve been searching for how to add a barcode scanner to my app. Are there any examples or how can I do this easily?


Using ZXing to create an Android barcode scanning app

I&#39;m writing this in mere desperation :) I&#39;ve been assigned to make a standalone barcode scanner (as a proof of concept) to an Android 1.6 phone.

For this i&#39;ve discovered the ZXing library.

I&#39;ve googled, read related topics here on StackOverflow used common sence and so forth. Nothing seemed to have helped, and i just can&#39;t punch a hole on this mentale blockade :/

I know it to be possible, to use the lib, and create your own standalone barcode scanner. I&#39;ve read that using the &quot;Barcode Scanner&quot; provided by the Zxing folks, is by far the easiest solution (via Intent). Unfortunately this is not an option, and a standalone app is desired.

So to sum up my problem :

1. How to integrate ZXing source lib into my Android Code project through Eclipse?
2. When integrated ... how to make use of the lib, to &quot;load&quot; the scanning function?
3. A step to step guide is almost prefered because i just started working in Eclipse.

I&#39;ve tried to make my code project dependant of the Android folder from the ZXing source folder. When i do so, a handfull errors emerge, mostly concerning &#39;org.apache&#39; (??)

I just can&#39;t figure it out ... so a few hints would be most helpfull.

In advance, thank you :)

Integrating the ZXing library directly into my Android application

I&#39;m trying to use the barbecue barcode printing library. I have successfully added the library to IntelliJ through project structure add library.  Then I imported the packages and wrote the methods, which gave me no error.  The packages were available in the class.

But when I compile it gives me the error:

    error: package net.sourceforge.barbecue does not exist

How can this be?

I&#39;m coding in ubuntu, is there any other place to which I have to add the library?


Why does IntelliJ give me &quot;Package doesn&#39;t exist&quot; error?

Using `iOS 10.0` last beta. I had tried to use Camera to scan barcode in my app, and it crashed with this runtime error.

&gt; This app has crashed because it attempted to access privacy-sensitive
&gt; data without a usage description.  The app&#39;s Info.plist must contain
&gt; an NSCameraUsageDescription key with a string value explaining to the
&gt; user how the app uses this data.

Put this key into the plist, but it still crashed? 

Content Type	Original Author	Original Content on Stackoverflow
Question	om.	View Question on Stackoverflow
Solution 1 - Java	Chris Dail	View Answer on Stackoverflow
Solution 2 - Java	Arto Uusikangas	View Answer on Stackoverflow
Solution 3 - Java	True Soft	View Answer on Stackoverflow
Solution 4 - Java	Vineet Manohar	View Answer on Stackoverflow
Solution 5 - Java	bguiz	View Answer on Stackoverflow

BarCode Image Generator in Java

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

Solution 3 - Java

Solution 4 - Java

Solution 5 - Java

Why isn't C/C++'s "#pragma once" an ISO standard?

Opening files in the same folder as the current file, in vim

Attributions