How can I create EPS files in C#?

How can I create EPS files in C#? Are there any opensource libraries available or do I have to resort to the spec and do it by hand?

From stackoverflow yoyoyoyosef

• You can use the same principle as I suggested in the HTML to Postscript question here: html-to-postscript-conversion

  It is clumsy to set up, but once it is done it works quite well. If you don't have a printer driver that creates EPS files you can download some of the freeware pdf creator printer drivers. I believe some of these allow you to create EPS files as well.

  From Rune Grimstad

• The cairo library http://www.cairographics.org generate all kinds of graphical formats, svf, pdf or ps for instance, and it has bindings for c# I think.

  From stephanea

How does one add a svn repository build number to Python code?

EDIT: This question duplicates http://stackoverflow.com/questions/110175/how-to-access-the-current-subversion-build-number#111173 (Thanks for the heads up, Charles!)

Hi there,

This question is similar to http://stackoverflow.com/questions/16248/getting-the-subversion-repository-number-into-code

The differences being:

1. I would like to add the revision number to Python

2. I want the revision of the repository (not the checked out file)

I.e. I would like to extract the Revision number from the return from 'svn info', likeso:

$ svn info

Path: .
URL: svn://localhost/B/trunk
Repository Root: svn://localhost/B
Revision: 375
Node Kind: directory
Schedule: normal
Last Changed Author: bmh
Last Changed Rev: 375
Last Changed Date: 2008-10-27 12:09:00 -0400 (Mon, 27 Oct 2008)

I want a variable with 375 (the Revision). It's easy enough with put $Rev$ into a variable to keep track of changes on a file. However, I would like to keep track of the repository's version, and I understand (and it seems based on my tests) that $Rev$ only updates when the file changes.

My initial thoughts turn to using the svn/libsvn module built in to Python, though I can't find any documentation on or examples of how to use them.

Alternatively, I've thought calling 'svn info' and regex'ing the code out, though that seems rather brutal. :)

Help would be most appreciated.

Thanks & Cheers.

From stackoverflow Brian M. Hunt

• I use a technique very similar to this in order to show the current subversion revision number in my shell:

  svnRev=$(echo "$(svn info)" | grep "^Revision" | awk -F": " '{print $2};')
  echo $svnRev
  

  It works very well for me.

  Why do you want the python files to change every time the version number of the entire repository is incremented? This will make doing things like doing a diff between two files annoying if one is from the repo, and the other is from a tarball..

  Cebjyre : I would imagine BMH doesn't want to use this in every file, but to have a single location that details the current version of the system - look at the bottom right of this page for an example.
  From Jerub

• Python has direct bindings to libsvn, so you don't need to invoke the command line client at all. See this blog post for more details.

  EDIT: You can basically do something like this:

  from svn import fs, repos, core
  repository = repos.open(root_path)
  fs_ptr = repos.fs(repository)
  youngest_revision_number = fs.youngest_rev(fs_ptr)
  

  Charles Duffy : Yes, but that doesn't give you access to all the logic in svnversion -- which does *exactly* the Right Thing in this kind of situation.
  From JesperE

• There is a command called svnversion which comes with subversion and is meant to solve exactly that kind of problem.

  Charles Duffy : You might amend this to show how one would write the result to a build artifact bundled into a generated egg/package/whatnot, just to be complete and answer both legs of the question (how to calculate the answer, and how to bundle it into your python project).
  From CesarB

• If you want to have a variable in one source file that can be set to the current working copy revision, and does not replay on subversion and a working copy being actually available at the time you run your program, then SubWCRev my be your solution.

  There also seems to be a linux port called SVNWCRev

  Both perform substitution of $WCREV$ with the highest commit level of the working copy. Other information may also be provided.

  From Ber

• Stolen directly from django:

  def get_svn_revision(path=None):
      rev = None
      if path is None:
          path = MODULE.__path__[0]
      entries_path = '%s/.svn/entries' % path
  
      if os.path.exists(entries_path):
          entries = open(entries_path, 'r').read()
          # Versions >= 7 of the entries file are flat text.  The first line is
          # the version number. The next set of digits after 'dir' is the revision.
          if re.match('(\d+)', entries):
              rev_match = re.search('\d+\s+dir\s+(\d+)', entries)
              if rev_match:
                  rev = rev_match.groups()[0]
          # Older XML versions of the file specify revision as an attribute of
          # the first entries node.
          else:
              from xml.dom import minidom
              dom = minidom.parse(entries_path)
              rev = dom.getElementsByTagName('entry')[0].getAttribute('revision')
  
      if rev:
          return u'SVN-%s' % rev
      return u'SVN-unknown'
  

  Adapt as appropriate. YOu might want to change MODULE for the name of one of your codemodules.

  This code has the advantage of working even if the destination system does not have subversion installed.

  From pobk

• Based on CesarB's response and the link Charles provided, I've done the following:

  try:
    from subprocess import Popen, PIPE
    _p = Popen(["svnversion", "."], stdout=PIPE)
    REVISION= _p.communicate()[0]
    _p = None # otherwise we get a wild exception when Django auto-reloads
  except Exception, e:
    print "Could not get revision number: ", e
    REVISION="Unknown"
  

  Golly Python is cool. :)

  From Brian M. Hunt

Why does addition of long variables cause concatenation?

What does Java do with long variables while performing addition?

Wrong version 1:

Vector speeds = ... //whatever, speeds.size() returns 2
long estimated = 1l;
long time = speeds.size() + estimated; // time = 21; string concatenation??

Wrong version 2:

Vector speeds = ... //whatever, speeds.size() returns 2
long estimated = 1l;
long time = estimated + speeds.size(); // time = 12; string concatenation??

Correct version:

Vector speeds = ... //whatever, speeds.size() returns 2
long estimated = 1l;
long size = speeds.size();
long time = size + estimated; // time = 3; correct

I don't get it, why Java concatenate them.

Can anybody help me, why two primitive variables are concatenated?

Greetings, guerda

From stackoverflow furtelwart

• I suspect you're not seeing what you think you're seeing. Java doesn't do this.

  Please try to provide a short but complete program which demonstrates this. Here's a short but complete program which demonstrates correct behaviour, but with your "wrong" code (i.e. a counterexample).

  import java.util.*;
  
  public class Test
  {
      public static void main(String[] args)
      {
          Vector speeds = new Vector();
          speeds.add("x");
          speeds.add("y");
  
          long estimated = 1l;
          long time = speeds.size() + estimated;
          System.out.println(time); // Prints out 3
      }
  }
  

  matt b : So what was it about this answer that was correct? What was the author doing wrong?

  furtelwart : Yeah, I was wrong. It was probably a thread problem.
  From Jon Skeet

• My guess is you are actually doing something like:

  System.out.println("" + size + estimated);
  

  This expression is evaluated left to right:

  "" + size        <--- string concatenation, so if size is 3, will produce "3"
  "3" + estimated  <--- string concatenation, so if estimated is 2, will produce "32"
  

  To get this to work, you should do:

  System.out.println("" + (size + estimated));
  

  Again this is evaluated left to right:

  "" + (expression) <-- string concatenation - need to evaluate expression first
  (3 + 2)           <-- 5
  Hence:
  "" + 5            <-- string concatenation - will produce "5"
  

  From toolkit

Dynamic rendering of webpage for logged in users only

When a user logs in to my site I want a css styled button to appear (this could be anything really, i.e. some special news text item etc), how can you do this via masterpages in asp.net? Or is there some other way you do this?

From stackoverflow Vidar

• This MSDN article describes how you can find and manipulate master page content from a content page.

  MSDN

  From Steve Horn

• Check out the LoginView control in ASP.Net. It takes two templates - one for logged in users and one for not-logged in users. I guess it should do what you want.

  From Rune Grimstad

• You haven't provided a whole lot of information about your setup simon, but assuming you're using a .NET Membership Provider, then you can use a login view to have a section of your page render differently for logged in Vs. not

      <asp:LoginView>
          <AnonymousTemplate>
              Nothing Displayed
          </AnonymousTemplate>
          <LoggedInTemplate>
              <asp:Button ID="myButton" runat="server">
          </LoggedInTemplate>
      </asp:LoginView>
  

  From Eoin Campbell

Self-owned objects in Objective-C Garbage Collection

I'm wondering what are the recommended ways to handle situations where, in memory managed code, object didn't belong to any particular owner, i.e. objects released themselves. One such example could be a subclass of NSWindowController, which configures, displays and manages input and output of a single window. The controller object displays a window and releases itself later at some point (usually when the window or sheet it manages is closed). AppKit provides couple examples as well: NSAnimation retains itself in startAnimation and releases itself when the animation is done. Another example is NSWindow, which can be configured to release itself when closed.

When implementing these "self-owned" objects myself, I see at least three different GC-safe patterns, but all of them have some drawbacks.

a). Using CFRetain/CFRelease.

Self-owned object calls CFRetain on self before it starts its operation (e.g. in the window controller example before the window is displayed). It then calls CFRelease() on self when it's done (e.g. in the window controller example after the window is closed).

Pros: User of the object doesn't have to worry about memory management.
Cons: A bit ugly, since requires use of memory management functions, although we're using GC in pure ObjC code. If CFRelease() isn't called, leak may be hard to locate.

b). Avoiding self-ownership idiom with static data structure.

Object adds itself into a data structure (e.g. a static mutable array) before it starts its operation and removes itself from there when it's done.

Pros: User of the object doesn't have to worry about memory management. No calls to memory management functions. Objects have explicit owner. Potential leaks are easy to locate.
Cons: Locking is needed if objects may be created from different threads. Extra data structure.

c). Avoiding self-ownership idiom by requiring the user of object to save a reference to the object (e.g. into an ivar).

Pros: No calls to memory management functions. Objects have explicit owner.
Cons: User of the object has to keep a reference even if it doesn't need the object anymore. Extra ivars.

What pattern would you use to handle these cases?

From stackoverflow Nikita Zhuk

• Apple's recommendation is (c), but I like the sound of (b). A static data structure allows you to hide the GC details from the API user while avoiding dipping into the CFRetain/CFRelease level. As you state, it also makes debugging and unit testing easier; if an object is still referenced by the static data structure after it's finished its task, you know there's a bug.

  From Barry Wark

• For a), the more idiomatic alternative to CFRetain(foo)/CFRelease(foo) is [[NSGarbageCollector defaultCollector] disableCollectorForPointer:foo]/[[NSGarbageCollector defaultCollector] enableCollectorForPointer:foo].

  From Ahruman

WebSphere Portal v.5.1 and AJP?

Hello,

is there a way to configure WebSphere Portal to accept AJP connections? E.g. Tomcat/JBoss and Oracle have a specific AJP port. I can't find it in WebSphere, and I'm getting tired of Googlin' around IBM pages.

Thank you in forward... Balint

From stackoverflow Balint Pato

• Configuring an AJP connector

  From jitter

Effort Spent on Designing, Implementing and Maintaining CRUD.

Hi,

What percentage of your total development effort do you spend on implementing and maintaining simple Create, Read, Update and Delete (CRUD) methods in your data access layer?

Does moving to an ORM like Hibernate or Entity Framework lead to significant savings? Are there any design smells which let you know when moving to an ORM for your data access layer is a good choice?

Kind regards, Ashish

From stackoverflow SharePoint Newbie

• Having recently spent ridiculous numbers of hours (probably on the order of 40%) duplicating what an ORM would have done in minutes, I have to say that whenever you can allow well tested frameworks to generate (and maintain!) basic CRUD operations, LET IT DO IT!

  Let the framework do that at which it excels. Spend your time on the part of the application that really adds value, the business problem you're solving. Only when the framework falls short should you really consider working around it. 'Falling short' could include performance, but generally there are "hooks and knobs" within the framework to let you do what you need to get done.

  Implementation/Design Smell: When you've coded the 'StoredProcedureWrapper' for the 40th time or are implementing caching for query results by capturing DAO output, you coulda/shoulda used ORM

  With a Ruby/Rails or Groovy/Grails type of framework, I can't see a real reason NOT to start with the ORM layer, as both environments generate the Domain for you.

  With Spring/Hibernate, it is a little more complicated, but still saves a lot of hand-coding of very similar small classes.

  I've also found in several projects in the last 10 years or so that if we didn't start using an ORM, we ended up developing or 'stealing' JDBC frameworks or other scaffolding code that again duplicates a lot of what an ORM can get you.

  From Ken Gentle

Are you using event streaming products?

Maybe you're familiar with the concept of event streaming processing (ESP) ... if you are, I'd love to hear what you're using and what platforms you're using them on. I am an active contributor to the Esper project (http://esper.codehaus.org/) but I'd be interested in hearing what others are using? Anyone using Coral8, Aleri or Streambase? What platforms are you using them on?

From stackoverflow Ajaxx

• at present i am not using any event stream processing (ESP) / complex event processing (CEP) products, but am familiar with the concepts - we evaluated Streambase for a prior (military) project and I still get emails from them every now and then ;-)

  I looked into using esper for another real-time system (not a financial trading system, which seems to be the primary application for CEP these days), but thought it was - no offense - overkill. We wanted something lightweight to control an event-driven process in such a way that it could be altered without redeploying the code base, but frankly ran out of time so the evaluation did not get to go 'deep' enough. Will probably revisit this in future.

  ESP/CEP is underrated, in my opinion, as a solution platform. It can be difficult to comprehend if you're used to purely transactional thinking.

  From Steven A. Lowe

• At a previous job, we looked at Cayuga, Esper, StreamBase, and Coral8. I'm actually interested in seeing if I can make a souped-up RSS reader using one of these engines and a text-processing engine. I'm not sure how it would all fit together, as I haven't had the time to think about it, but I think an RSS item can be consumed as an "event", processed, and then things could happen if similar "events" (similar messages or postings) are received in a time span. Perhaps the identification of hot topics and such.

  Stephen Darlington : CEP engines tend to work best when data is "pushed" into it. RSS is more "periodic polling," but it certainly could be done. You'd probably have to write an RSS-CEP adapter, but that wouldn't be terribly hard. Spotting patterns in the stream is what CEP/ESP platforms were designed for.
  From Thomas Owens

• I work for Aleri (opinions here are my own, though), so my view is a little skewed. Having said that...

  We're seeing a number of great use cases, ranging hugely in complexity and data volume. A few examples:

  • Market data cleansing. We take stock quotes and "sanitise" them, flagging quotes that are out of expected market bounds
  • Algo trading is the canonical CEP example application, and that's kind of the sanitising application above with an extra piece at the end that places an order if a certain pattern of events occurs
  • Aggregating order books across trading venues, i.e., feeding in market prices across exchanges and outputting a consolidated order book
  • Liquidity and risk management

  Some people use it for the low-latency aspect, but many use it because it allows rapid development of many event-driven applications.

  I'm seeing a lot of installations on Solaris/x86-64 machines, though we also have SPARC and Linux in production too.

  By the way, most vendors use the term CEP, Complex Event Processing, to describe their products. I don't think that was the best TLA to use, but it looks as though we're stuck with it now.

  Feel free to ask any further questions. Obviously there are certain things I can't talk about but I'll do what I can.

  From Stephen Darlington

• I was on a team that did a proof-of concept with rulecore. We used it to run a couple of hundreds of rules which were automatically generated from a database. We used a single server with 16 gigs of ram and 4 cores.

  From Dieter

Web.Config Falling back to Global Config in Web Farm

Hi all,

This problem has several of us stumped in the office. We are all new to deploying ASP.NET apps to a web farm, and I am fresh out of ideas.

We have a web farm, and the application is copied on to all of them. However, we are having a problem..

An exception is being thrown when trying to get settings from appSettings. Upon further investigation, it turns out the node is actually not using the local Web.Config but it falling back to the Web.Config in the .NET framework folder (we have proved this by adding keys there, which appear on a test page).

I must be missing something, because my understanding is that so long as the file is there, IIS should use that! One of the servers seems to work fine!

Here's a list of what we have confirmed:

• The config file is in the app directory.
• Said file's content is correct.
• When viewing the file from IIS > Site > Properties > ASP.NET > Edit Config the correct content is shown.

However, at run-time the file that is used is the global one (windows\ms .net\framework\v2\config\web.config).

Anyone have any suggestions as to what may be going wrong? Appreciate all the help I can get!

Thanks.

Rob

From stackoverflow Rob Cooper

• This is the hierarchy for ASP.NET configuration. Maybe this could help understanding which settings overwrite each other.

  Server

  Machine.config: The Machine.config file contains the ASP.NET schema for all of the Web applications on the server. This file is at the top of the configuration merge hierarchy.

  Root Web

  Web.config: The Web.config file for the server is stored in the same directory as the Machine.config file and contains default values for most of the system.web configuration sections. At run time, this file is merged second from the top in the configuration hierarchy.

  Web site

  Web.config: The Web.config file for a specific Web site contains settings that apply to the Web site and inherit downward through all of the ASP.NET applications and subdirectories of the site.

  ASP.NET application root directory

  Web.config: The Web.config file for a specific ASP.NET application is located in the root directory of the application and contains settings that apply to the Web application and inherit downward through all of the subdirectories in its branch.

  ASP.NET application subdirectory

  Web.config: The Web.config file for an application subdirectory contains settings that apply to this subdirectory and inherit downward through all of the subdirectories in its branch.

  Client application directory

  ApplicationName.config: The ApplicationName.config file contains settings for a Windows client application (not a Web application).

  ---

  Understanding which ASP.NET files and folders are inherited through folders and applications is very important for development and troubleshooting.

  Here is a short summary:

  • web.config files inherit all the way down the tree, past all application boundaries.
  • global.asax only lives within its application
  • /bin and the /app_{folders} only live within their application

  So, this means that anything set in the root web.config file will inherit down the entire site, even if some folders are marked as applications.

  Where this gets messy is if the web.config file has references to assemblies but sub-applications don't have those assemblies. For example, let's say that you have a HTTP Module configured in the root of the site and referenced from the site web.config file. If you have a sub-application called /subfolder which is marked as an application, then /subfolder will attempt to load the HTTP Handler from /subfolder/bin. Since it doesn't exist, an error will be thrown.

  There are multiple ways around this. Probably the cleanest if the HTTP Handler isn't needed in /subfolder is by 'removing' the reference by adding a clause in the /subfolder/web.config file. You can do this with . Here is an example of how to remove a HTTP Module in a subfolder:

  <httpModules>
    <remove name="ErrorLog"/>
  </httpModules>
  

  Here is what the site web.config might look like:

  <httpModules>
        <add name="ErrorLog"  type="GotDotNet.Elmah.ErrorLogModule, GotDotNet.Elmah, Version=1.0.5527.0, Culture=neutral, PublicKeyToken=978d5e1bd64b33e5" />
  </httpModules>print("code sample");
  

  Rob Cooper : My understanding is that the application level file takes precedence? The problem here is that at runtime, the application file does not get picked up. Thanks for the reply.

  Rob Cooper : Based on your expansion [thanks] - the file being applied is the Root Web, but there *is* a Web.config for the application!

  splattne : What happens, if you insert an erroroneous entry in that web.config? Does the application get that?
  From splattne

• From what you tell in the comments, I suggest going with "Try and Error".

  What happens, if you insert an erroneous entry by purpose? Does the application fail or doesn't that affect anything?

  Try to copy the content and then delete and recreate that file from scratch.

  From splattne

• Hi All,

  First off, thank you very much to the guys that answered, I do appreciate the help!

  Just an update on this issue. It was a tough one!

  Turns out, there was nothing wrong with the code, or the configuration.

  It appears that something weird was going on with the server farm (which I have absolutely no control over or access to). The sysadmin re-built the farm, re-deployed the solution and all worked fine.

  I guess we will never know what was wrong, but at least we know it was not a development issue!

  Thanks again, Rob

  From Rob Cooper

Is mutation testing useful in practice?

It exists the technology of mutation testing. It checks, if the tests are running even if you change the code. If not all is OK, if the tests are running they don't cover all eventualities. There is some theoretical work about it, but I'm interested in the question, if it is useful in practice? Do you have any examples of real life applications of mutation testing? Does it work better than simple test-coverage-tools? Or is it useless?

What are the advantages/disadvantages of mutation testing in the real world?

From stackoverflow Mnementh

• I looked at mutation test some time ago as a method for checking the efficacy of my automated regession testing scripts. Basically, a number of these scripts had missing checkpoints, so while they were exercising the application being tested correctly, they weren't verifying the results against the baseline data. I found that a far simpler method than changing the code was to write another application to introduce modifications to a copy of the baseline, and re-run the tests against the modified baseline. In this scenario, any test that passed was either faulty or incomplete.

  This is not genuine mutation testing, but a method that uses a similar paradigm to test the efficacy of test scripts. It is simple enough to implement, and IMO does a good job.

  From Shane MacLaughlin

• I recently did some investigations on mutation testing. Results are here:

  http://abeletsky.blogspot.com/2010/07/using-of-mutation-testing-in-real.html

  In short: mutation testing could give some information about quality of source code and tests, but it is something straighforward to use.

  From alexanderb

HTML <select> what is the name of on select event?

Does the HTML "select" element have an on select event? what exactly is the name of the event?

From stackoverflow J Angwenyi

• Is onchange what you're looking for?

  J Angwenyi : fantastic stuff - works!!! thanks guys.
  From insin

• Regardless of input type, whenever a form input changes value, an onchange event should always be thrown. (With the exception of buttons, as they are not really input devices as such.)

  insin : Worth noting that when you're using a , the event is fired immediately on selection, whereas with something like a text input, it's not fired until you move off the field. Checkboxes and radio buttons are fiddly with onchange, so it's best to use onclick for those.

  From Ryan McCue

  It's onchange Event.

  With jQuery it could be used like this

  <html>
  <head>
      <script type="text/javascript" src="jquery-1.2.6.js"></script>
      <script type="text/javascript">
          $(document).ready(function()
          {
              $("#list").attr("selectedIndex", -1);
  
              $("#list").change(function()
              {
                  $("#answer").text($("#list option:selected").val());
              });
          });
      </script>
  </head>
  <body>
      <div id="answer">No answer</div>
      <form>
          Answer
          <select id="list">
              <option value="Answer A">A</option>
              <option value="Answer B">B</option>
              <option value="Answer C">C</option>
          </select>
      </form>
  </body>
  </html>
  

  Jeremy Visser : The world is not jQuery. Probably best to respond with a generic JS response if the O.P. didn't explicitly ask for jQuery.

  Jim G. : +1: I was, in fact, searching for a jQuery solution. Thanks.

  From Alexander Prokofyev

  It's also worth mentioning that this doesn't fire if the selection doesn't change (seems self explanatory). As far as I know there is no event that fires when a user drops down the selectbox and then reselects the original value.

  From $pageUsers[$post.author].name

  Parsing through XML elements in XmlReader

  Hi all,

  I'm building an application that needs to run through an XML feed but I'm having a little trouble with getting certain elements.

  I'm using the Twitter feed and want to run through all the <item> elements. I can connect fine and get the content from the feed but I can't figure out how to select only the item elements when I'm loopuing through reader.Read();.

  Thanks for your help!

  From stackoverflow Ross

  • The easiest way to do that is to use XPath. Example to follow.

     string xml = @"<?xml version=""1.0"" encoding=""UTF-8""?>
    <rss version=""2.0"">
        <channel>
        <title>Twitter public timeline</title>
        <link>http://twitter.com/public_timeline</link>
        <description>Twitter updates from everyone!</description>
        <language>en-us</language>
        <ttl>40</ttl>
    
        <item>
          <title>yasu_kobayashi: rTwT: @junm : yayaya</title>
          <description>yasu_kobayashi: rTwT: @junm : yayaya</description>
          <pubDate>Tue, 28 Oct 2008 12:04:48 +0000</pubDate>
          <guid>http://twitter.com/yasu_kobayashi/statuses/978829930</guid>
          <link>http://twitter.com/yasu_kobayashi/statuses/978829930</link>
    
        </item><item>
          <title>FreeGroup: WikiFortio - foobar http://tinyurl.com/5gvttf</title>
          <description>FreeGroup: WikiFortio - foobar
          http://tinyurl.com/5gvttf</description>
          <pubDate>Tue, 28 Oct 2008 12:04:47 +0000</pubDate>
          <guid>http://twitter.com/FreeGroup/statuses/978829929</guid>
          <link>http://twitter.com/FreeGroup/statuses/978829929</link>
    
        </item></channel></rss>
            ";
                XPathDocument doc = new XPathDocument(new StringReader(xml));
                XPathNavigator nav = doc.CreateNavigator();
    
                // Compile a standard XPath expression
    
                XPathExpression expr;
                expr = nav.Compile("/rss/channel/item");
                XPathNodeIterator iterator = nav.Select(expr);
    
                // Iterate on the node set
    
                try
                {
                    while (iterator.MoveNext())
                    {
                        XPathNavigator nav2 = iterator.Current.Clone();
                        nav2.MoveToChild("title","");
                        Console.WriteLine(nav2.Value);
                        nav2.MoveToParent();
                        nav2.MoveToChild("pubDate","");
                        Console.WriteLine(nav2.Value);
    
                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
                Console.ReadKey();
    

    And this is jan's approach working

            XmlDocument doc2 = new XmlDocument();
            doc2.LoadXml(xml);
            XmlNode root = doc2.DocumentElement;
    
            foreach (XmlNode item in root.SelectNodes(@"/rss/channel/item"))
            {
                Console.WriteLine(item.SelectSingleNode("title").FirstChild.Value);
                Console.WriteLine(item.SelectSingleNode("pubDate").FirstChild.Value);
            }
    

    From Vinko Vrsalovic

  • An alternative:

    // starts as in Vinko Vrsalovic 's answer
    // and not including decent eror handling
    XmlDocument doc = new XmlDocument(new StringReader(xml)); 
    
    foreach (XmlNode item in doc.SelectNodes(@"/rss/channel/item"))
    {
      Console.WriteLine(item.SelectSingleNode("title").Value);
      Console.WriteLine(item.SelectSingleNode("pubDate").Value);
    }
    

    I don't know if this code is slower or bad practice. Please do comment.

    I find it more readable than the other one using Navigator and Iterator.

    Edit: I use an XmlDocument. An XPathDocument as in Vinko Vrsalovic 's answer doesn't support this way of working, but is a lot faster: (MSDN)

    AnthonyWJones : Unless you have a very large stream which makes loading the content into a document undesirable then this would a reasonable approach and a lot more readable than using an XmlReader.

    Vinko Vrsalovic : I like this approach too. But you can't use it with a XPathDocument, you need a XmlNode

    jan : My mistake! I meant XmlDocument. But since I can imagine a Twitter rss feed to become very large, I'd go - in this case - for an implementation using XPathDocument too.
    From jan

  Non localized error messages in Asp.net

  I've got a Polish version of Windows installed and therefore I get exception messages in Polish. Is there a way to make asp.net display error messages in English? Other than installing English version of Windows.

  From stackoverflow sumek

  • Try adding the following to the system.web section of your web.config file:

    <globalization uiCulture="en-US" />
    

    This should work unless:

    • you have changed the uiCulture explicitly elsewhere (e.g. multilingual web apps may change the uiCulture for each request)

    • the error you are getting occurs before the web.config file is processed.

    From Joe

  Eclipse project directory

  Is there a way to get the directory of a project in Eclipse? We are writing a plugin that will allow the user to select files, and then run some processes on those files. I would ideally like to be able to get all the files with a certain extension, but that is not necessary.

  From stackoverflow Milhous

  • sure:

    ResourcesPlugin.getWorkspace().getRoot().getProjects()
    

    will get you a list of all the projects in the workspace. you can easily iterate to find the one you want. At that point, you can look for certain files by extensions, etc.

    Milhous : I will try that.
    From AdamC

  • If you want to enable your users to select files inside eclipse workspace with a certain extension, you can look at the class org.eclipse.ui.dialogs.ElementTreeSelectionDialog (org.eclipse.ui.dialogs plugin)as a start.

    Then, to have an example on how to make it filter extensions, you can look at the class org.eclipse.jdt.internal.ui.viewsupport.FilteredElementTreeSelectionDialog (org.eclipse.jdt.ui plugin) to see how they do it and then reimplement the stuff.

    This should give you a higher level of action than going threw files inside projects by hand and reimplement dialogs.

    From Denis R.

  Oracle stored procedure with parameters for IN clause

  How can I create an Oracle stored procedure which accepts a variable number of parameter values used to feed a IN clause?

  This is what I am trying to achieve. I do not know how to declare in PLSQL for passing a variable list of primary keys of the rows I want to update.

  FUNCTION EXECUTE_UPDATE
    ( <parameter_list>
     value IN int)
    RETURN  int IS
  BEGIN 
      [...other statements...]
      update table1 set col1 = col1 - value where id in (<parameter_list>) 
  
      RETURN SQL%ROWCOUNT ;
  END;
  

  Also, I would like to call this procedure from C#, so it must be compatible with .NET capabilities.

  Thanks, Robert

  From stackoverflow Robert Mircea

  • I've not done it for Oracle, but with SQL Server you can use a function to convert a CSV string into a table, which can then be used in an IN clause. It should be straight-forward to re-write this for Oracle (I think!)

    CREATE Function dbo.CsvToInt ( @Array varchar(1000)) 
    returns @IntTable table 
        (IntValue nvarchar(100))
    AS
    begin
    
        declare @separator char(1)
        set @separator = ','
    
        declare @separator_position int 
        declare @array_value varchar(1000) 
    
        set @array = @array + ','
    
        while patindex('%,%' , @array) <> 0 
        begin
    
          select @separator_position =  patindex('%,%' , @array)
          select @array_value = left(@array, @separator_position - 1)
    
         Insert @IntTable
         Values (Cast(@array_value as nvarchar))
    
          select @array = stuff(@array, 1, @separator_position, '')
        end
    
        return
    end
    

    Then you can pass in a CSV string (e.g. '0001,0002,0003') and do something like

    UPDATE table1 SET 
           col1 = col1 - value 
    WHERE id in (SELECT * FROM csvToInt(@myParam))
    

    tuinstoel : Something similar can be done with PL/SQL but it is faster to pass a collection to the procedure as a csv string. The csv string needs to be tokenized first in PL/SQL.
    From RB

  • Why does it have to be a stored procedure? You could build up a prepared statement programmatically.

    Robert Mircea : i need to execute in plsql procedure more statements than an "update". I simplified a little bit the problem for the sake of example.
    From flukus

  • There is an article on the AskTom web site that shows how to create a function to parse the CSV string and use this in your statement in a similar way to the SQL Server example given.

    See Asktom

    From Gazmo

  • I think there is no direct way to create procedures with variable number of parameters. However there are some, at least partial solutions to the problem, described here.

    1. If there are some typical call types procedure overloading may help.
    2. If there is an upper limit in the number of parameters (and their type is also known in advance), default values of parameters may help.
    3. The best option is maybe the usage of cursor variables what are pointers to database cursors.

    Unfortunately I have no experience with .NET environments.

    From rics

  • Using CSV is probably the simplest way, assuming you can be 100% certain that your elements won't themselves contain strings.

    An alternative, and probably more robust, way of doing this is to create a custom type as a table of strings. Supposing your strings were never longer than 100 characters, then you could have:

    CREATE TYPE string_table AS TABLE OF varchar2(100);
    

    You can then pass a variable of this type into your stored procedure and reference it directly. In your case, something like this:

    FUNCTION EXECUTE_UPDATE(
        identifierList string_table,
        value int)
    RETURN int
    IS
    BEGIN
    
        [...other stuff...]
    
        update table1 set col1 = col1 - value 
        where id in (select column_value from table(identifierList));
    
        RETURN SQL%ROWCOUNT;
    
    END
    

    The table() function turns your custom type into a table with a single column "COLUMN_VALUE", which you can then treat like any other table (so do joins or, in this case, subselects).

    The beauty of this is that Oracle will create a constructor for you, so when calling your stored procedure you can simply write:

    execute_update(string_table('foo','bar','baz'), 32);
    

    I'm assuming that you can handle building up this command programatically from C#.

    As an aside, at my company we have a number of these custom types defined as standard for lists of strings, doubles, ints and so on. We also make use of Oracle JPublisher to be able to map directly from these types into corresponding Java objects. I had a quick look around but I couldn't see any direct equivalents for C#. Just thought I'd mention it in case Java devs come across this question.

    From Ashley Mercer

  • Why not just use a long parameter list and load the values into a table constructor? Here is the SQL/PSM for this trick

    UPDATE Foobar SET x = 42 WHERE Foobar.keycol IN (SELECT X.parm FROM (VALUES (in_p01), (in_p02), .., (in_p99)) X(parm) WHERE X.parm IS NOT NULL);

    From $pageUsers[$post.author].name

  • I found the following article by Mark A. Williams which I thought would be a useful addition to this thread. The article gives a good example of passing arrays from C# to PL/SQL procs using associative arrays (TYPE myType IS TABLE OF mytable.row%TYPE INDEX BY PLS_INTEGER):

    Great article by Mark A. Williams

    From bowthy

  How to increase stack size for a ruby app. Recursive app getting: Stack level too deep (SystemStackError)

  Posting a stack overflow question on stackoverflow.com, how amusing :-)

  I'm running some recursive Ruby code and I get the: "Stack level too deep (SystemStackError)"

  (I'm quite sure the code works, that I'm not in an infinite recursive death spiral, but that is not the point anyway)

  Is there anyway to change the allowed stack depth/size for my Ruby app?

  I don't quite get it if this is a restriction in Ruby, since the error says "Stack level", which gives me the impression that Ruby somehow counts 'levels' of stack, or if it simply means that the stack is full.

  I have tried running this program under both Vista and Ubuntu with same result. Under Ubuntu i tried changing the stack size with 'ulimit -s' from 8192 to 16000, but that didn't change anything.

  Edit: Thanks for the feedback.
  I do realize that using a recursive function perhaps isn't the most robust way to go. But that isn't the point either. I simply wonder if there is a way to increase the stack size.. period. And as I mentioned i did try running ulimit -s 16000 before running the ruby script.. with no improvement.. Am I using it wrong?

  Edit2: I was in fact having an infinite recursion in an edge case of the code.
  The truncated ruby stack trace when you get the "Stack level too deep" error is a bit misleading.
  When having a recursive behavior involving several functions, you get the impression that the numbers of recursions is much lower than it actually is. In this example one might thing that it crashes after little bit more than 190 calls, but it is actually around 15000 calls

  tst.rb:8:in `p': stack level too deep (SystemStackError)
          from tst.rb:8:in `bar'
          from tst.rb:12:in `bar'
          from tst.rb:19:in `foo'
          from tst.rb:10:in `bar'
          from tst.rb:19:in `foo'
          from tst.rb:10:in `bar'
          from tst.rb:19:in `foo'
          from tst.rb:10:in `bar'
           ... 190 levels...
          from tst.rb:19:in `foo'
          from tst.rb:10:in `bar'
          from tst.rb:19:in `foo'
          from tst.rb:22
  

  -Andreas

  From stackoverflow Andreas

  • Yukihiro Matsumoto writes here

    Ruby uses C stack, so that you need to use ulimit to specify a limit on stack depth.

    From Alexander Prokofyev

  • Ruby uses the C stack so your options include using ulimit or compiling Ruby with some compiler/linker stack size flag. Tail recursion is yet to be implemented and Ruby's current support for recursion isn't so great. As cool and elegant recursion is, you might want to consider coping with the language's limitations and writing your code in a different way.

    From Firas Assaad

  • Think about what is going on with the code. As other posters have mentioned it is possible to hack the C code of the interpreter. However. the result will be that you are using more RAM and have no guarantee that you won't blow the stack again.

    The really good solution would be to come up with an iterative algorithm for what you are trying to do. Sometimes memoisation can help and sometimes you find you are not using the stuff you are pushing on the stack in which case you can replace recursive calls with mutable state.

    If you are new to this sort of stuff have a look at SICP here for some ideas...

    From domgblackwell

  • If you are sure that you do not have an Infinite recursion situation then your algorythm is pobably not suited for Ruby to execute it in a recirsive manner. Converting an algorythm from recursion to different kind of stack is pretty easy and I suggest you try that. Here is how you can do it.

    def recursive(params)
      if some_conditions(params)
         recursive(update_params(params))
      end
    end
    
    recursive(starting_params)
    

    will transform into

    stack = [starting_params]
    while !stack.empty?
      current_params = stack.delete_at(0)
      if some_conditions(current_params)
        stack << update_params(current_params)
      end
    end
    

    From Honza

  How to make app fully SQL Server 2005 compatible?

  We have an application that use MSSQL, when we move to 2005, basically we recommend to our client to apply the backward compatibility package and that’s it, but somebody ask me what to do to be 100% compatible on 2005. I was thinking on 1. Compatibility level: SQL Server 2005 (90) 2. Remove any DMO reference, and replaced by SMO 3. Connect using ADO

  I am not sure if this is the correct answer.

  From stackoverflow $pageUsers[$entry.posts[0].author].name

  • Actually you are talking about two different things.

    One is to update the database to SQL 2005 level, to be able to use the functions only available there. It can be done easily by setting the compatibility level. However in this case SQL 2000 clients can have problems with it.

    Second is to upgrade your application to use only SQL 2005 related libraries. This is also easy, basically the steps what you have written. In this case your application can also work with SQL 2000 databases (except if you use some SQL 2005 specific feature) because the libraries are backward compatible.

    End words: you are either way compatible with SQL 2005, the only difference is that you can use SQL 2005 specific features or not.

    Why not change to SQL 2008 already? Here is a thread about this topic.

    From Biri

  • To see if you are really compatible, the only way to find out is to run your app on an SQL 2005 server without the backward compatibility package. If you have an exhaustive test suite it will help a lot but you need to make sure that all your backend code gets hit and performs normally.

    I have worked on an application that used SQL 2000 and SQL 2005 and the only bits of the app which needed version-switching were in some hairy reflection code which needed to use SQL Server's system tables to dynamically discover tables at runtime. The solution for us was to use dynamic SQL but you need to make the right choice for your app and users.

    Your app is 100% SQL 2005 compatible if it will run correctly on an 'out of the box' SQL 2005 configuration without any backward compatiblity fixes applied.

    From domgblackwell

  • If you have any DTS packages they will need to be converted to SSIS packages to be fully compatible.

    If you really want to make sure that you are fully compatible, check out in the documentation which features are being deprecated and if you are using any of them, go ahead and fix them now.

    YOu might also look at any code you have that could use the pivot feature that was not in 2000. The old code will work but the pivot code will be a better choice and probably more efficient. The same thing with other new features, check out how you were working around them and fix. One big one to consider is if you can get rid of your text fileds with the new datatype, varchar (max). Then look for places in your code where you were converting to a varchar in order to do comparisons.

    From HLGEM

  Problem with Swing GUI on Macintosh

  Hi,

  I am new to Swing.

  Are there any specific issues related to customizing the paint operation on the Mac?

  I have developed a sample application using NetBeans + Swing on Windows. It is working fine. But if I run the same application on a Mac, panels' buttons' labels don't appear on the screen. Only when the mouse over operation is performed on particular component does it get displayed on the screen.

  Kindly can anyone help me out in solving this issue?

  Thanks in advance. sakkiharry

  From stackoverflow $pageUsers[$entry.posts[0].author].name

  • Since Swing paints all UI itself, it is not really influenced by Mac OS. There are exceptions, though. If you allow Java to use a native menu, the menu will behave like any other Swing menu, but it is in fact translated to native menu functions (so it will be displayed on top of screen and behave like a native Mac OS X menu... nothing you as programmer need to care about, but great for Mac users, who hate menus to appear elsewhere).

    I guess your issue is probably something else, but it's hard to guess, if I have no code to work with. Can you break down the issue into an ultra minimal test case? E.g. can you just draw a JFrame, add a singe one of your custom buttons there, that shows the problematic behavior and just use as much code as is necessary to paint this minimal UI and expose the problem? If you'd post this code here, I'd take a closer look into it and will try to find out what causes the issue and how to resolve it (I'm a graduated Java programmer, but I also have years of Mac OS X development experience; so these are two fields of knowledge I should know really well, but I usually don't combine them, as I don't develop in Java for Mac OS X).

    From Mecki

  Sending Emails as a "batch execution job"

  I do not have any experience in web based development(neither client side nor server s ide code). since long time i had a question as to if anything like below is possible to do:

  1.) I have say 10 attachments 1.zip to 10.zip on my desktop.

  2.) I need to send all of these as an attachment using any web based email (I need to send out these mails using my gmail)

  3.)At a time lets say i can attach only 1 file. 1.zip per email(attachment size limitations)

  4.)At present i have to do the task of sending these files as attachments, repeatedly with lot of manual intervention, i.e. attach one file, type the sender email id, and click send. Wait till the email is sent(It takes around 4-5 minutes for the email to be sent) Then attach second file, and repeat the steps above.

  5.) So i was wondering if is it possible to automate this process by somekind of Plugin/Code extension to:-

  a.) Internet Explorer

  b.) Mozilla firefox (greasemonkey based extensions)

  Any pointers,

  -AD

  From stackoverflow goldenmean

  • This will be the responsibility of the webmail client you are using.

    Mutiple uplaods are possible, but only if the web app you are using can deal with them. If you are using Gmail, I'd submit a feature request to them.

    The best way would be to use an IMAP email client (thunderbird, outlook express) to send your emails rather than web mail.

    StingyJack : To clarify your point, @goldenmean should use Firebird or Outlook express to connect to the webmail account, and use that "thick client" to send the emails.
    From Ady

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