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• C++: Most common way to talk to one application from the other one

  - by MInner

  In bare outlines, I've got an application which looks through the directories at startup and creates special files' index - after that it works like daemon. The other application creates such 'special' files and places them in some directory. What way of informing the first application about a new file (to index it) is the most common, simple (the first one is run-time, so it shouldn't slow it too much), and cross-platform if it is possible? I've looked through RPC and IPC but they are too heavy (also non-cross-platform and slow (need a lot of features to work - I need a simple light well-working way), probably).

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• Is Python a beginner language or is it robust?

  - by orokusaki

  I am already working on some software in Python but I'm having one of those days where I step back and reflect just to make sure I'm not spinning my wheels. I know that Twitter launched with RoR because it was fast to build. Then they almost moved into another language in 2008 because of scalability issues. This has caused me to step back and introspect for a moment to make sure I'm heading down the right path. I've read in some tutorials and other places that Python is "a great first language" or a "nice beginner language" as though it's not capable of larger tasks. I look at it as Python can do what Java or ASP can but with about 1/4th of the code, not to mention I don't have to build or compile, etc. I've read that Java runs quite a few times faster than Python which is important of course, but then I read everywhere that hardware keeps getting cheaper and there are projects like Unladen Swallow by Google to make Python faster. Should I be concerned or is this just the remnants of Java developers?

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• Wireshark Plugin: Dissecting Payloads With Multiple Packets Per UDP Frame

  - by John Dibling

  I am writing a Wireshark plugin to dissect a protocol that places multiple application-level packets in a single UDP frame. There is no enclosing protocol that indicates how many packets there are in the frame. So essentially, the payload coming down the wire will look like this: uint64 sequence1 uint64 data1 uint8 flags1 uint64 sequence2 uint64 data2 uint8 flags2 : : : uint64 sequence_n uint64 data_n uint8 flags_n In my server code that actually processes this information, I simply loop through the frame until I reach the end. In looking through the plugins included with the wireshark source code, I didn't see any protocols that did any looping like this. I know other protocols pack multiple payloads per frame. What is the cannonical or standard way to handle protocols like this in a Wireshark dissector?

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• For the iPad or iPhone, how do you control the system Volume? For example, have a button that mutes

  - by SolidSnake4444

  I would like to make a button in my iPad app (probably will be similar to iPhone apps) that when I push this button, all audio is muted, even when you exit the app. I don't see anyway that you can control the volume, although I'm sure other apps have that I have seen in the app store for the iPhone. I also read some places that doing this would reject you from the app store. How could I go about lowering, or highering the volume of the iPad from an app that works even when the app closes? Thank you!

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• SEF URL Problem in Joomla1.5

  - by Emrul Hasan

  My joomla site url is: http://www.cessnatrader.com. I am using SEF URL for this site. The SEF URL is not working in the main menu(in top). But it is working fine for other places(other links, footer menu). I don't know what the problem is. I did all the things for enabling SEF URL in joomla. But it is not working in one place(main menu). What should I do? Note: I am using "Mosets tree" component in this site.

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• Correct formulation of the A* algorithm

  - by Eli Bendersky

  Hello, I'm looking at definitions of the A* path-finding algorithm, and it seems to be defined somewhat differently in different places. The difference is in the action performed when going through the successors of a node, and finding that a successor is on the closed list. One approach (suggested by Wikipedia, and this article) says: if the successor is on the closed list, just ignore it Another approach (suggested here and here, for example) says: if the successor is on the closed list, examine its cost. If it's higher than the currently computed score, remove the item from the closed list for future examination. I'm confused - which method is correct ? Intuitively, the first makes more sense to me, but I wonder about the difference in definition. Is one of the definitions wrong, or are they somehow isomorphic ?

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• CURL issue in PHP while getting location list

  - by Ajay

  I am retrieving the nearest locations available from a given address (Longitude/Latitude) from geolocation website. It works fine, but for some places it gives junk characters in the name. Moreover, in browser I am getting different characters compared to my PHP CURL functionality. Here is the URL http://www.geoplugin.net/extras/nearby.gp?lat=17.7374669&long=83.3214858&limit=5&radius=50&format=php One of the location is "Sitampeta" in original location name, but in browser I am getting "Sitammapeta" where as in CURL function I am getting "SÄ«tammapeta". Please tell me why this difference. I wrote a function to convert browser output to original which works fine. function convert ($old) { $n=""; for ($i=0; $i<strlen($old); $i++) { $n .= chr(ord(substr($old,$i,1))); } return $n; } But I dont understand how I convert the CURL output to original name.

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• Bit Flipping in Hex

  - by freyrs

  I have an 8 digit hexadecimal number of which I need certain digits to be either 0 or f. Given the specific place of the digits is there a quick way to generate the hex number with those places "flipped" to f. For example: flip_digits(1) = 0x000000f flip_digits(1,2,4) = 0x0000f0ff flip_digits(1,7,8) = 0xff00000f I'm doing this on an embedded device so I can't call any math libraries, I suspect it can be done with just bit shifts but I can't quite figure out the method. Any sort of solution (Python, C, Pseudocode) will work. Thanks in advance.

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• How to ignore the .classpath for Eclipse projects using Mercurial?

  - by Feanor

  I'm trying to share a repository between my Mac (laptop) and PC (desktop). There are some external dependencies for the project that are stored on different places on each machine, and noted in the .classpath file in the Eclipse project. When the project changes are shared, the dependencies break. I'm trying to figure out how to keep this from happening. I've tried using .hgignore with the following settings, among others, without success: syntax: glob *.classpath Based on this question, it appears that the .hgignore file will not allow Mercurial to ignore files that are also committed to the repository. Is there another way around this? Other ways to configure the project to make it work?

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• How to write a technical blog?

  - by Gutzofter

  I have a blog that I would like to increase traffic on. I've read lots of technical blogs, but it's a lot different writing a blog versus reading a blog. There seems to be several ways to write a post. General article: I like this tool. This is how I do it. Specific technical issue: Programming solutions. I do get some traffic, but they don't leave any comments. Should I use HN and Reddit. What are some of the other places I can promote my blog? How to respond to negative comments (trolls)? Another thing is you might want to have some link-thrus. comment on other peoples blog posts. BTW my blog is: (defun ugly-lisp-code () ()) New Blog ugly web development

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• Should I be using assert in my PHP code?

  - by Darryl Hein

  A co-worker has added the assert command a few times within our libraries in places where I would have used an if statement and thrown an exception. (I had never even heard of assert before this.) Here is an example of how he used it: assert('isset($this->records); /* Records must be set before this is called. */'); I would have done: if ( ! isset($this->records) { throw new Exception('Records must be set before this is called'); } From reading the PHP docs on assert, it looks like it's recommended that make sure assert is active and add a handler before using assert. I can't find a place where he's done this. So, my question is, is using assert a good idea given the above and should I be using it more often instead of if's and exceptions?

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• Example where Up-Front Design (Would have) Saved You Time

  - by Winston Ewert

  In various places I've seen the claim that by designing a system up-front, you can significantly reduce development time. I.e. by spending an hour designing you can save a week coding. My problem is that I have never seen a situation where I found this to be true. So I want to know of any examples out there that people have where this would be true: So: What sort of problem arose during coding? (or was avoided?) How could you have avoided (or did avoid) the problem by spending more time doing design? Why was it (or would it have been) hard to fix the problem in the code?

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• Why does Google append while(1); in front of their JSON responses?

  - by Andrew Koester

  This is something I've always been curious about, is exactly why Google appends while(1); in front of their (private) JSON responses. For example, here's a response while turning a calendar on and off in Google Calendar: while(1);[['u',[['smsSentFlag','false'],['hideInvitations','false'],['remindOnRespondedEventsOnly','true'],['hideInvitations_remindOnRespondedEventsOnly','false_true'],['Calendar ID stripped for privacy','false'],['smsVerifiedFlag','true']]]] I would assume this is to prevent people from doing an eval() on it, but all you'd really have to do is replace the while and then you'd be set. I would assume eval prevention is to make sure people write safe JSON parsing code. I've seen this used in a couple other places, too, but a lot more so with Google (Mail, Calendar, Contacts, etc.) Strangely enough, Google Docs starts with &&&START&&& instead, and Google Contacts seems to start with while(1); &&&START&&&. Does anyone know what's going on here?

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• jquery: call functions immediately after plugin

  - by Dave

  I'm sure that there's an easy answer to this, but I can't find it. I have a table 'myTable' which I stripe using the following $("#myTable tr:even").css({ "background-color": "#FEE996" }); $("#myTable tr:odd").css({ "background-color": "#FFEFAF" }); This works fine. I am also using a table filter plugin as follows $('#myTable').tableFilter(); This plugin places a blank field at the top of each column into which the filter criteria can be typed. When the table is filtered it removes unmatched rows, which in turn messes up the striping. I would like to be able to re-invoke the lines to re-stripe the table. Something like $('#myTable').tableFilter().find("tr:even").css({ "background-color": "#FEE996" }).find("tr:even").css({ "background-color": "#FFEFAF" }); Is this possible please?

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• Where would I use a bitwise operator in JavaScript?

  - by J-P

  I've read this (http://stackoverflow.com/quest...), so I know what bitwise operators are but I'm still not clear on how one might use them... Can anyone offer any real-world examples of where a bitwise operator would be useful in JavaScript? Thanks. Edit: Just digging into the jQuery source I've found a couple of places where bitwise operators are used, for example: (only the & operator) // Line 2756: event.which = (event.button & 1 ? 1 : ( event.button & 2 ? 3 : ( event.button & 4 ? 2 : 0 ) )); // Line 2101 var ret = a.compareDocumentPosition(b) & 4 ? -1 : a === b ? 0 : 1;

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• In .NET, what thread will Events be handled in?

  - by Ben

  I have attempted to implement a producer/consumer pattern in c#. I have a consumer thread that monitors a shared queue, and a producer thread that places items onto the shared queue. The producer thread is subscribed to receive data...that is, it has an event handler, and just sits around and waits for an OnData event to fire (the data is being sent from a 3rd party api). When it gets the data, it sticks it on the queue so the consumer can handle it. When the OnData event does fire in the producer, I had expected it to be handled by my producer thread. But that doesn't seem to be what is happening. The OnData event seems as if it's being handled on a new thread instead! Is this how .net always works...events are handled on their own thread? Can I control what thread will handle events when they're raised? What if hundreds of events are raised near-simultaneously...would each have its own thread?

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• subversion 1.6.x losing changes on check-in

  - by Bernard

  I'm trying to figure out if this is a known issue with SVN 1.6.x Developer A modifies a file and commits it. Developer B modifies the same file. Tries to commit it and gets told local copy out of date so does an update and then a commit. However the changes from Developer A are lost so the resulting file only contains the version that Developer B checked in. We can see this in the logs. It seems to happen when the same file is modified but in different places. Anyone else experienced this? We've had it happen 4 or 5 times in the past few weeks and we've lost a half day or so each time trying to figure out what's been lost, etc. We're starting to lose confidence in SVN. Should we be thinking of moving to GIT or Mecurial? Would that sort out this problem?

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• MVC & Design patterns in C++

  - by theunanonim

  I have an assignment (university level) in C++ The application that was done so far: - MVC agenda - the views are command-line - Agenda contains a list of contacts - a contact may be a friend or an acquiantance - Agenda may contain also a Company that is a contact and may contain other contacts (sorry the code is already too big as I tried to keep the MVC aspect of the application, and I can't post it here or request your time to study it..) To do: - implement factory method pattern - implement observer pattern - implement strategy pattern - implement visitor pattern The evaluation will depend on the number of added patterns and places they have been added. Am I an idiot or this is the stupidies possible assignement ? If not, please help me with some basic tips.. which one where ? Best Regards. P.S. Sorry for my English

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• search submitbutton in all forms with textareas with jquery

  - by domueni

  Hi there i'm working on a ff-plugin which searchs a webpage for all textareas and places a warning before the submit button. my code looks like this var submitWarning = content.document.createElement("div"); submitWarning.innerHTML = "Fancy Message"; $('textarea', window.content.document).each(function() { var form = $(this, window.content.document).parents('form:first'); $(form, window.content.document).children('input[type=submit]').each(function() { form.insertBefore(submitWarning, this); }); }); if i search all submits with $('input[type=submit]'.each... it works fine but since i added the thing with the textarea and the form:first i got problems (nothing happens) p.s. i use the window.content.document thingy because its a ff-plugin and it won't work nothing without it

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• Search Result displaying-like google php

  - by Ramesh

  i have an paragraph and user will search inside that and if the search term has 3 matches inside but all are in 3 different places ex World War II, or the Second World War[1] (often abbreviated WWII or WW2), was a global military conflict lasting from 1939 to 1945 which involved most of the world's nations, including all of the great powers, organised into two opposing military alliances: the Allies and the Axis. It was the most widespread war in history, with more than 100 million military personnel mobilised. In a state of "total war," the major participants placed their entire economic, industrial, and scientific capabilities at the service of the war effort, erasing the distinction between civilian and military resources. Marked by significant action against civilians, including the Holocaust and the only use of nuclear weapons in warfare, it was the deadliest conflict in human history,[2] with over seventy million casualties. i have to search "war" so that it should display like World War II, or the Second World War[1].....In a state of "totalwar,".... some thing like this ///

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• How do I return a variable from $.post() in jQuery? Closure variable?

  - by James Bao

  I am having trouble passing data retrieved from a $.post() function to use in other places in my code. I want to save the data as a variable and use it outside of the post() function. This is my code: var last_update = function() { $.post('/--/feed', {func:'latest', who:$.defaults.login}, function($j){ _j = JSON.parse($j); alert(_j.text); // This one works }); } alert(_j.text); // This one doesn't }; last_update(); //run the function Please help!

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• htaccess rewrite rule issue - not able to get 10th variable - getting 1st variable appended with a 0

  - by sandeepan-nath

  With the following rewrite rule - RewriteRule ^(browse_by_exam)/(classes|packs|tutor_search)/([a-zA-Z0-9.\á\á\â\ä\ã\å\æ\ç\è\é\ê\ë\ì\í\ï\ð\ñ\ò\ó\ô\õ\ö\ø\ù\ú\û\ü\ý\þ\¿\¡\«\»\ÿ\ß\$*!-\=\@#\%\^()_\&{}\;\,\<\?`\~[\|\"\']\\ +]+)/([0-1])/([0-9]+)/([0-9]+)/([0-9]+),([0-9]+),([a-z]+),([a-z]+)?$ index.php?a=$1&type=$2&search_text=$3&new_search=$4&search_exam=$5&search_subject=$6&site=$7&count=$8&column=$9&direction=$10 I am not able to get the 10th variable using $_GET['direction'] in my php code - it returns me the 1st variable appended with a 0 i.e. browse_by_exam0. I read in many places about this thing. Here http://www.digimantra.com/tutorials/advanced-htaccess-for-more-than-10-group-of-backtrack-references/, they have given a workaround for the problem - using %1 instead of $10, but that too is not working. Please help. I am completely blocked.

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• How does java LoginContext.login() work?

  - by tangens

  I have this code to create a configuration of a java client to connect to a JBoss application server: System.setProperty( "java.security.auth.login.config", "auth.conf" ); LoginContext auth = new LoginContext( "myAuth", new LoginCallbackHandler( username, password ) ); auth.login(); The file auth.conf contains the following lines: myAuth { org.jboss.security.ClientLoginModule required; }; Now, somewhere else in the code (the LoginContext auth isn't known there) I have an EJB that does a initialContext.lookup( jndiName ) and a narrow() to access a Bean on the JBoss application server. This narrow only succeeds if the login information of the first step was correct. Question How does the login information propagate from the LoginContext to the narrow()? I don't see any connection between these two places. And further, how could I do two or more different logins inside of one client?

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• Customize the From address in Rails application

  - by palani

  Hi , I have mailer action in my application, the mailer is configured with gmail smtp. The following is my config details under environment.rb file require "smtp_tls" ActionMailer::Base.delivery_method = :smtp ActionMailer::Base.perform_deliveries = true ActionMailer::Base.raise_delivery_errors = true ActionMailer::Base.default_charset = "utf-8" ActionMailer::Base.default_content_type = "text/html" ActionMailer::Base.smtp_settings = { :address => "smtp.gmail.com", :port => 587, :domain => 'gmail.com', :user_name => "[email protected]", :password => "password", :authentication => :plain The think i want to implement is, when ever the application generating email the from address shows "[email protected]". Is possible to customize the from address. In different places i want to use different From address instead of "[email protected]" I tried with my mailer model: @from = "#{user.email}" In development server log it shows the customized id correctly. if go my email inbox it shows the from address as "[email protected]" Can any one please guide on this. thanks in advance.

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• Java data structure to use with Hibernate to store unknown number of parameters?

  - by Lunikon

  Following problem: I want to render a news stream of short messages based on localized texts. In various places of these messages I have to insert parameters to "customize" them. I guess you know what I mean ;) My question probably falls into the "Which is the best style to do it?" category: How would you store these parameters (they may be Strings and Numbers that need to be formatted according to Locale) in the database? I'm using Hibernate to do the ORM and I can think of the following solutions: build a combined String and save it as such (ugly and hard to maintain I think) do some kind of fancy normalization and and make every parameter a single row on the database (clean I guess, but a performance nightmare) Put the params into an Array, Map or other Java data structure and save it in binary format (probably causes a lot of overhead size-wise) I tend towards option #3 but I'm afraid that it might be to costly in terms of size in the database. What do you think?

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