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• What is the right license for tutorial source code ?

  - by devdude

  Putting sourcecode from tutorials or books online requires the author to add some kind of disclaimer or license (otherwise people would use it make lots of $$$ or break a power plant IT control system and sue you as author). But what is the right license or disclaimer statement ? Can I use BSD license with ... IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,... We are talking about tutorials ! Released to teach and share knowledge. Or do I need to follow the (potentially different) licenses of the libraries I use ? Might be insignificant now but I feel we will face a license hunt in "public" sourcecode (aka OSS) in future, similar to companies/lawyers currently crawling the web for pictures with wrong copyright statement or infringing their IP (and suing someone using a picture in a personal blog,etc..).

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• Combining lists but getting unique members

  - by MC

  I have a bit of a special requirement when combining lists. I will try to illustrate with an example. Lets say I'm working with 2 lists of GamePlayer objects. GamePlayer has a property called LastGamePlayed. A unique GamePlayer is identified through the GamePlayer.ID property. Now I'd like to combine listA and listB into one list, and if a given player is present in both lists I'd like to keep the value from listA. I can't just combine the lists and use a comparer because my uniqueness is based on ID, and if my comparer checks ID I will not have control over whether it picks the element of listA or listB. I need something like: for each player in listB { if not listA.Contains(player) { listFinal.Add(player) } } However, is there a more optimal way to do this instead of searching listA for each element in listB?

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• What is the relationship between recursion functions and memory stack?

  - by Eslam

  is there's a direct relationship between recursive functions and the memory stack, for more explanation consider that code: public static int triangle(int n) { System.out.println(“Entering: n = ” + n); if (n == 1) { System.out.println(“Returning 1”); return 1; } else { int temp = n + triangle(n - 1); System.out.println(“Returning“ + temp); return temp; } }? in this example where will the values 2,3,4,5 be stored until the function returns ? note that they will be returned in LIFO(LastInFirstOut) is these a special case of recursion that deals with the memory stack or they always goes together?

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• WPF: How to dynamically find a usercontrol or datatemplate

  - by Elger

  I have a bunch of datatemplates I use to display various sql-views in an ItemsControl. I don't know which datatemplate i'm going to use until run-time. (every view has different columns) Next to that, I made a generic dynamic datatemplate for all those views that don't need anything special. When I display the view I want to first look in all the available datatemplates if there is one that matches, else use the default dynamic datatemplate. My question is how can I 'search' a datatemplate by name in code? Usercontrol is also possible. Thanks, Elger

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• Why are primes important in cryptography?

  - by Michael Stum

  One thing that always strikes me as a non-cryptographer: Why is it so important to use Prime numbers? What makes them so special in cryptography? Does anyone have a simple short explanation? (I am aware that there are many primers and that Applied Cryptography is the Bible, but as said: I am not looking to implement my own cryptographic algorithm, and the stuff that I found just made my brain explode - no 10 pages of math formulas please :)) Thanks for all the answers. I've accepted the one that made the actual concept most clear to me.

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• Creating DescriptionAttribute on Enumeration Field using System.Reflection.Emit

  - by Manish Sinha

  I have a list of strings which are candidates for Enumerations values. They are Don't send diffs 500 lines 1000 lines 5000 lines Send entire diff The problem is that spaces, special characters are not a part of identifiers and even cannot start with a number, so I would be sanitizing these values to only chars, numbers and _ To keep the original values I thought of putting these strings in the DescriptionAttribute, such that the final Enum should look like public enum DiffBehvaiour { [Description("Don't send diffs")] Dont_send_diffs, [Description("500 lines")] Diff_500_lines, [Description("1000 lines")] Diff_1000_lines, [Description("5000 lines")] Diff_5000_lines, [Description("Send entire diff")] Send_entire_diff } Then later using code I will retrieve the real string associated with the enumeration value, so that the correct string can be sent back the web service to get the correct resource. I want to know how to create the DescriptionAttribute using System.Reflection.Emit Basically the question is where and how to store the original string so that when the Enumeration value is chosen, the corresponding value can be retrieved. I am also interested in knowing how to access DescriptionAttribute when needed.

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• How to get XDebug working on Mac command line PHP

  - by Eugene M

  I recently installed Zend Server Community Edition on a Mac with Snow Leopard. I can't get XDebug to work ... it shows up in the output for phpinfo from a web browser, but when I var_dump() a variable, there is no special output, and when I run phpunit, code coverage reports aren't generated. Also when I type php -m at the command line, there is nothing for XDebug. I suspect that it's because the Mac is running the executable of PHP that was bundled with it instead of the executable of PHP that came with the Zend Server install. When I type /usr/local/zend/bin/php -m, XDebug does show up. I followed the instructions at http://akrabat.com/php/some-notes-on-zend-server-ce-for-mac-os-x/. Also I downloaded the xdebug.so from the Komodo web site. Zend Debugger and all other Zend extensions are disabled. So how can I get XDebug working correctly?

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• Is it possible to use CDATA inside <pre> tag.

  - by Alexander Pogrebnyak

  I want to display an exception trace in the HTML page. One way to do this is to escape HTML special characters in the exception trace and dump it inside the <pre> tag. Although it works, it's terribly inefficient. I thought that one approach would be to wrap the trace with CDATA. I've tried it, but nothing get's displayed. My question, can this be done? Here is my feeble attempt. <pre><![CDATA[blah, blah, blah with <> and blah blah blah with & and more blah, blah]]></pre>

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• Mapping A Sphere To A Cube

  - by petrocket

  There is a special way of mapping a cube to a sphere described here: http://mathproofs.blogspot.com/2005/07/mapping-cube-to-sphere.html It is not your basic "normalize the point and your done" approach and gives a much more evenly spaced mapping. I've tried to do the inverse of the mapping going from sphere coords to cube coords and have been unable to come up the working equations. It's a rather complex system of equations with lots of square roots. Any math geniuses want to take a crack at it? Here's the equations in c++ code: sx = x * sqrtf(1.0f - y * y * 0.5f - z * z * 0.5f + y * y * z * z / 3.0f); sy = y * sqrtf(1.0f - z * z * 0.5f - x * x * 0.5f + z * z * x * x / 3.0f); sz = z * sqrtf(1.0f - x * x * 0.5f - y * y * 0.5f + x * x * y * y / 3.0f); sx,sy,sz are the sphere coords and x,y,z are the cube coords.

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• Python lazy property decorator

  - by detly

  Recently I've gone through an existing code base and refactored a lot of instance attributes to be lazy, ie. not be initialised in the constructor but only upon first read. These attributes do not change over the lifetime of the instance, but they're a real bottleneck to calculate that first time and only really accessed for special cases. I find myself typing the following snippet of code over and over again for various attributes across various classes: class testA(object): def __init__(self): self._a = None self._b = None @property def a(self): if self._a is None: # Calculate the attribute now self._a = 7 return self._a @property def b(self): #etc Is there an existing decorator to do this already in Python that I'm simply unaware of? Or, is there a reasonably simple way to define a decorator that does this? I'm working under Python 2.5, but 2.6 answers might still be interesting if they are significantly different.

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• Server Development Tool?

  - by aloneguid

  Hi, For my programming tasks I use about 2-3 remote servers to deploy and run my code against different conditions. This cannot be emulated locally as the server configuration requires powerful hardware. Most of time I need to stop service, update binareis, start service, view logs in realtime, download logs. Currently I'm doing this manually and over time this becomes a real pain in the ass, especially because the environment is not ideal in terms of network badwidth, reliability etc. I just wonder if someone from server programmers have the similar problems and how do you bear with them. Any special tools/hints/secrets?

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• Higher than high-level web frameworks or CMS's?

  - by Ben

  I'm looking for options that allow very high-level web site development with these special characteristics: not requiring the user to program in a complex programming language not requiring the user to use GUI-like administration areas allow the user to "program" in a lightweight markup language The last point is not only about look and structure of the output but also about creating simple dynamic output. For example: listing pages fetching the content of other pages doing a site search and displaying its output dynamically show or hide parts of the page depending on login status Of course, I am not expecting a solution that provides the same possibilities like a Ruby, Python or PHP web framework. Rather I am looking for support of the "basics" that are common for web sites. Until now, I have found only one piece of software that fulfills these requirements but while it's free, it's not open source: BoltWire at http://www.boltwire.com/. Being open source is required.

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• Why does Google's closure library not use real private members?

  - by Thor Thurn

  I've been a JavaScript developer for a while now, and I've always thought that the correct way to implement private members in JavaScript is to use the technique outlined by Doug Crockford here: http://javascript.crockford.com/private.html. I didn't think this was a particularly controversial piece of JavaScript wisdom, until I started using the Google Closure library. Imagine my surprise... the library makes no effort to use Crockford-style information hiding. All they do is use a special naming convention and note "private" members in the documentation. I'm in the habit of assuming that the guys at Google are usually on the leading edge of software quality, so what gives? Is there some downside to following Mr. Crockford's advice that's not obvious?

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• Django: How do I add arbitrary html attributes to input fields on a form?

  - by User

  I have an input field that is rendered with a template like so: <div class="field"> {{ form.city }} </div> Which is rendered as: <div class="field"> <input id="id_city" type="text" name="city" maxlength="100" /> </div> Now suppose I want to add an autocomplete="off" attribute to the input element that is rendered, how would I do that? Or onclick="xyz()" or class="my-special-css-class"?

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• HttpWebRequest socket operation during WPF binding in a property getter

  - by wpfwannabe

  In a property getter of a C# class I am doing a HTTP GET using HttpWebRequest to some https address. WPF's property binding seems to choke on this. If I try to access the property in a simple method e.g. Button_Clicked, it works perfectly. If I use WPF binding to access the same property, the app seems to be blocked on a socket's recv() method indefinitely. Is it a no-no to do this sort of thing during binding? Is app in some special state during binding? Is there an easy way for me to overcome this limitation and still maintain the same basic idea?

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• There are another way to load MSHTML documents without use Application.ProcessMessages?

  - by douglaslise

  There are another way to load MSHTML documents without use Application.ProcessMessages? To load a document into a IHTMLDocument I need to do this: while Doc.readyState <> 'complete' do Application.ProcessMessages; I want not to process all the message queue during the loading, because I would be changing my application flow, in other words, some messages that should be processed after the loading to be completed can be processed earlier, even before the loading end. There is a special message code that the IHTMLDocument expect to advance in the loading process? Or there is another way to load? Thanks.

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• How do I allow inline images with data urls on .NET 4 without triggering request validation?

  - by Johan Driessen

  I'm using the jQuery jstree plugin (http://jstree.com) in a ASP.NET MVC 2 project on .NET 4 RC. It comes with some stylesheets with inline images with data urls, like this: .tree-checkbox ul { background-image:url(data:image/gif;base64,R0lGODlhAgACAIAAAB4dGf///yH5BAEAAAEALAAAAAACAAIAAAICRF4AOw==); } Now, the url for the background image contains a colon, which .NET 4 thinks is an unsafe character, so I get this error message: A potentially dangerous Request.Path value was detected from the client (:). According to the documentation, I am supposed to be able to prevent this by adding <pages validateRequest="false" /> to my Web.config, but that doesn't seem to help. I have tried adding it to the main Web.config for the application, as well as to a special Web.config in the /config folder, but to no avail. Is there any way to get .NET to allow this?

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• Overriding a function in Emacs Lisp

  - by scrapdog

  I would like to temporarily override the kill-new function. I have a way I want to reimplement kill-new that works in only in certain contexts, but I don't want to reimplement a special version of kill-region on top of that. (kill-new is called from kill-region) Since Emacs Lisp uses dynamic scoping, this should be possible, right? (On the other hand, it seems that this would be an unsafe thing to support, and it might make me a bit nervous knowing that it is possible...) I have experimented with using let and fset, but so far have found no way to get it to work as expected. So, hopefully someone can fill in the blank in the following pseudocode: (defun my-kill-new (string &optional replace yank-handler) (message "in my-kill-new!")) (defun foo () (some-form-that-binds-a-function (kill-new my-kill-new) (kill-region (point) (mark)))) What should some-form-that-binds-a-function be? Or am I barking up the wrong tree?

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• What is your strategy to avoid dynamic typing errors in Python (NoneType has no attribute x)?

  - by Koen Bok

  Python is one of my favorite languages, but I really have a love/hate relationship with it's dynamicness. Apart from the advantages, it often results in me forgetting to check a type, trying to call an attribute and getting the NoneType (or any other) has no attribute x error. A lot of them are pretty harmless but if not handled correctly they can bring down your entire app/process/etc. Over time I got better predicting where these could pop up and adding explicit type checking, but because I'm only human I miss one occasionally and then some end-user finds it. So I'm interested in your strategy to avoid these. Do you use type-checking decorators? Maybe special object wrappers? Please share...

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• How can HTML5 "replace" Flash?

  - by Kassini

  A topic of debate that's seen a resurgence since the unveiling of the iPad is the issue of Flash versus HTML5. There are those that suggest that HTML5 will one day supplant/replace Adobe Flash. I do not develop software that runs in a browser, so my (limited) understanding is: HTML is a pure-text markup language that is delivered over HTTP to a client browser. The client browser interprets the markup and renders (with varying degrees of success) the page according to an standard specification. Adobe Flash is a propriety framework for working with audio, video, sound and raster/vector graphics. It requires special authoring tools (a compiler perhaps?) and a custom player that's available as a plug-in to most common browsers. Could someone please explain (to this C/C++ developer) how it is possible from a technical/coding point-of-view that a text-based markup language (HTML5) could be considered a replacement to a multimedia framework (Flash)? Please no opinionated arguments - just technical facts.

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• Image 8-connectivity without excessive branching?

  - by shoosh

  I'm writing a low level image processing algorithm which needs to do alot of 8-connectivity checks for pixels. For every pixel I often need to check the pixels above it, below it and on its sides and diagonals. On the edges of the image there are special cases where there are only 5 or 3 neighbors instead of 8 neighbors for a pixels. The naive way to do it is for every access to check if the coordinates are in the right range and if not, return some default value. I'm looking for a way to avoid all these checks since they introduce a large overhead to the algorithm. Are there any tricks to avoid it altogether?

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• Automatic camera calibration

  - by srand

  From Wikipedia, camera resectioning is the process of finding the true parameters of the camera that produced a given photograph or video. Camera resectioning is also known as geometric camera calibration. Currently I am using Camera Calibration Toolbox for Matlab for my camera calibration. The toolbox returns calibration parameters such as focal length, principle point, skew, and distortion. However, the issue with this method is that it requires an extra step in calibrating the camera by using a special calibration object like a checkerboard. Additionally, it only works for one focus of the camera. How can I get the calibration parameters without manually calibrating? For example, how does Microsoft's Photosynth perform camera calibration on its images?

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• Stubbing ActiveRecord result arrays

  - by Matthias

  Using Ruby 1.8.6, stubbing a finder method to return an Array does not work when the code under test calls the 'count' method on the result: User.any_instance.stubs(:friends).returns([user1, user2]) That's because Array.count has only been added in Ruby 1.8.7. Rails also adds a count method dynamically, I believe through the ActiveRecord::Calculations module. Is there any way to turn this result array into something that behaves exactly as the special Array kind returned by a Rails finder method? When paginating results, it's easy: I can simply call [].paginate. But that doesn't work with normal finder results. I tried [].extend(ActiveRecord::Calculations) but that doesn't work either.

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• Web/HTML: how do referrer work technically?

  - by NoozNooz42

  I don't understand how comes webserver and trackers like Google Analytics are able to track referrals. Is it part of HTTP? Is it some (un)specified behavior of the browsers? Apparently everytime you click on a link on a webpage, the original webpage is passed along the request. What is the exact mechanism behind that? Is it specified by some spec? I've read a few docs and I've played with my own Tomcat server and my own Google Analytics account, but I don't understand how the "magic" happens. Bonus (totally related) question: if, on my own website (served by Tomcat), I put a link to another site, does the other site see my website as the "referrer" without me doing anything special in Tomcat?

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• Rendering plain text through PHP

  - by JP19

  Hi, For some reason, I want to serve my robots.txt via a PHP script. I have setup apache so that the robots.txt file request (infact all file requests) come to a single PHP script. The code I am using to render robots.txt is: echo "User-agent: wget\n"; echo "Disallow: /\n"; However, it is not processing the newlines. How to server robots.txt correctly, so search engines (or any client) see it properly? Do I have to send some special headers for txt files? EDIT: Now I have the following code: header("Content-Type: text/plain"); echo "User-agent: wget\n"; echo "Disallow: /\n"; which still does not display newlines (see http://sarcastic-quotes.com/robots.txt ). EDIT 2: Some people mentioned its just fine and not displayed in browser. Was just curious how does this one display correctly: http://en.wikipedia.org/robots.txt thanks JP

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