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• Resources for memory management in embedded application

  - by Elazar Leibovich

  How should I manage memory in my mission critical embedded application? I found some articles with google, but couldn't pinpoint a really useful practical guide. The DO-178b forbids dynamic memory allocations, but how will you manage the memory than? preallocate everything in advance and send a pointer to each function that needs allocation? Allocate it on the stack? Use a global static allocator (but then it's very similar to dynamic allocation)? Answers can be of the form of regular answer, reference to a resource, or reference to good opensource embedded system for example. clarification: The issue here is not whether or not memory management is availible for the embedded system. But what is a good design for an embedded system, to maximize reliability.

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• How to make a daemon which will accept arbitrary commands

  - by Jono

  Right now the program can be launched in a linux terminal. Once running you can type various commands and the program will do stuff on the machine until the user quits. I would like to make the program into a service that the user runs and it goes to the background. Then the user should be able to make commands to it. Like start and stop, and write something to a log and whatever else my program does. Note that I need to send it arbitrary commands that my program will handle, not just start and stop. Maybe this means it is no longer a daemon - I dont know. How do I do this? Also, if this is not too hard, I would like to be able to run multiple instances of this service. But it is not essential.

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• How to correctly handle click events on Widget

  - by www.liveinternet.ruusersilya_bog

  There is a task to make smt like todo list on widget (with dinamic number of elements), how to organize this list for click support on this elements. I only found how add click event on one widget layout element (with setOnClickPendingIntent), and how send text to widget element TextView. But it's unclear how handle click events for sub-elemets, or how get click coordinates(or item) where was click event. I saw widget "Agenda widget" - and it work fine with clicking on different calendar rows. I will be very much appreciated for help.

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• How do I make an About window the front-most window in a Cocoa application with no UI?

  - by mipadi

  I'm building a Cocoa application that runs as an item in the status bar. This application has an About window and an item to activate that about window, using the standard Cocoa mechanism for doing so (-[NSApplication orderFrontStandardAboutPanel:]). Naturally this is all hooked up automagically. It works great except for one thing: unlike most About windows, it shows up underneath all other windows, rather than on top. I believe this is because the application does not have a UI, so all its windows are automatically beneath other windows. Is there a way I can hook into the NSApplication mechanism for displaying the About window so I can send it to the front? I've poked around in the docs for NSApplication, but there's no way to get a reference to the About window that I can see so that I can make it appear on top.

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• Special characters incongruence

  - by Enrique

  Hello I'm building a Spring MVC web application that runs on Tomcat 6.0.20 and JDK 1.6.0_19. When I send some special characters through an HTML form some of them are stored as question marks ? For example these symbols are stored correctly: €, á, é, í, ‰, etc But some symbols are replaced with ? like: £, ?, ? MySQL tables charset is utf-8. My jsp also use utf-8 <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %> I have included org.springframework.web.filter.CharacterEncodingFilter in web.xml as suggested here When I debug the POST request when sending 3 characters €a£ with firebug I get: %E2%82%ACa%E2%82%A4 which is correct since E2 82 AC is the code for € and E2 82 A4 is the code for £ but £ is stored as ? in the database. When I save £ directly into the database it is displayed correctly in the webpage. How can I fix this?

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• Web based API that can tell me if a number is a landline or cell phone?

  - by MikeN

  My application sends SMS messages to people, but the numbers entered in as their cell phone are sometimes land lines (this is user error or the user not really knowing if the contact number they have is a cell phone or landline.) I found a few websites that can tell me if a number is a landline or cell phone, but they do not offer programatic API's. Is anyone aware of a way a web application can figure out if a number can receive SMS messages? I guess a test SMS message is one way, but my current SMS gateway fails hard when it gets a landline number and doesn't tell me the landline number it tried to send the SMS to. I'll follow this up with my carrier, but I would love an easy way to let the user entering phone numbers in if they are a landline or cell number. Update: There are ways to figure this out. Take a look at http://www.phonevalidator.com, they can query a phone number and figure out if it is a landline or cell phone.

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• How to split movie and play parts to look as a whole?

  - by luksow

  I'm writing software which is demonstraiting video on demand service. One of the feature is something similiar to IIS Smooth Streaming - I want to adjust quality to the bandwith of the client. My idea is, to split single movie into many, let's say - 2 seconds parts, in different qualities and then send it to the client and play them. The point is that for example first part can be in very high quality, and second in really poor (if the bandwith seems to be poor). The question is - do you know any software that allows me to cut movies precisly? For example ffmpeg splits movies in a way that join is visible and really annoying (seconds are the measure of precision). I use qt + phonon as a player if it matters. Or maybe you know any better way to provide such feature, without splitting movie into parts?

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• Securing an ajax request

  - by asdasdsa

  i have a website that uses session cookies for security. it works fine and all, but any ajax requests right now are not secure. example being lets say a user is on a page. they can only get to this page if they are logged in with a session - so far so good. but now the ajax request they ask for is ajaxpages/somepage.php?somevar=something&anothervar=something if any other user decides to just go to that link themselves (without a session) they still get the same ajax output that was meant for logged in people. so obviously im going to have to pass session data across when i send an ajax request. anyone have any tips for the best way of doing this? ive never done this before and would rather use trusted methods than make up my own.

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• How to access a website's url programmatically from within the page

  - by Jeff

  For work, I am working on a site that has a feature that lets users make custom instances of the site depending on who they want to show it to. So if they want to show their potential employer a little bit about themselves, they can send them a custom url, that has a uid on the end of it that tells the database what to show and what not to when the site is loaded up. Now, I need to be able to take the value that is on the end of the url, this unique uid that corresponds with their preferences in the db, accessable on run time. Meaning that when someone types in this custom url, I need to be able to show the name of the person whose portfolio is being viewed BEFORE password authentication takes place... If I could get the URL, I suppose I could parse through it to find the necessary UID...but how do I get the url? Maybe I am just missing something here, but if anyone has any thoughts or ideas, it would be appreciated!! Thanks

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• Django admin return to page after save

  - by Thordin9

  Hi all, I have 3 pages of items listed in my django application admin. After i edit one of them (lets say it is in page 2) and save my changes, i return to page 1 of my listing. How can i make it so i return to the page the item is in? I looked into some similar questions here at stackoverflow and i believe that i need to use javascript to send a httpresponse with the location header. But how i can determine the page the item is in? any help is appreciated

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• How do I submit a form using jquery (ajaxForm plugin) to an external site but not reload to a differ

  - by Scott

  Hi, I'm trying to create a form that sends the customer's name and email address to icontact (an email list application). All the values are correct for icontact and if I submit the form as usual, icontact responds that it added the email address. The success message loads in a new page from icontact's website. What I'd like to accomplish is that ajax would send the form and returns a success message within the current page, without sending the customer to a new page. Here is the test page: http://www.skhot.com/test/js-test/forms/index.php

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• Real-Time Data Streaming to Multiple Clients

  - by AriX

  Hi all, I would like to write an application which will stream data at 2400 baud over the internet from a server to multiple clients. The data will be the same for each client, and it would probably be fine to send it as a UDP stream, since exact data accuracy is not a 100% necessity, as there are checksums built-in to the data format and the data will be sent repeatedly on a loop. What is the best way to do this? I would want to write the server in C, but I don't know how to best multicast this data to the different clients that would be receiving it all over the country. I'm sure this seems like a pretty draconian way to go about my project, as opposed to just using some sort of fetch command, but I'd prefer to do it this way if possible.

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• Android programming: Authentication and data exchange with Java EE

  - by Konsumierer

  I am having a Java application running in a Tomcat server using Spring, Hibernate, etc. and a two web interfaces, one implemented in Tapestry 5 and the other one using Flex with BlazeDS and Spring-BlazeDS. In my first android application I would now like to log in to the server and retrieve some data. I´m wondering how I could achieve this in a secure way. First of all I need to know which technology is the best to retrieve data from the server and how can I restrict the access to users only that have been successfully authenticated. With what I read until now I would try to implement a HTTPServlet on the server and make server calls via HTTP Client. In the servlet I could probably use the HTTPSession to check if the request comes from an authenticated user. And the data I would try to send serialized (JSON). Unfortunately, I´ve never done those things and maybe I´m on the wrong way and there are more comfortable solutions.

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• creating ports and initiating communication between client and server

  - by dave

  what i need is a server that listens to 5060 port , when the client sends data to that port the server should open up another port ( any port after 1250 i believe ) and forward the clients data to that port keeping 5060 idle so it can perform the same function for the next client so basically i need the server to a) open up multiple ports one for each client b) get the voice data from the client and be able to send voice data to that client i m looking into the hardware specs and other such details of the scenario so i dont have time to make such a program myself if theres a code that i can run directly ( both server and client side ) on visual studio .net 2010 that will perform these tasks then that would be extremely helpful thanks alot in advance

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• How do I hook all http get requests and distinguish downloaded (by standard download manager) files

  - by Ivan

  I want to write a Firefox add-on for advanced history tracking and bookmarking which will send URLs the browser meets during usage (and all the metadata available about the context) to a web service which will keep track of them storing in an SQL database for further access and analysis. I'd like to divide URLs tracked into 5 groups: those I explicitly click to bookmark, those I download by Firefox standard built-in download manager, all other URLs accessed, all URLs met on all viewed pages as hrefs, all other URLs mentioned in HTML sources of all viewed pages. Any ideas of how to get those in an extension?

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• Post serialized to xml object to mvc action

  - by Maxim

  Hello! i have 2 projects. First project send to 2-nd via http-post requests, as serialized to XML class instances. Ex: <?xml version="1.0" encoding="utf-16"?> <MyObject xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <UserId>test user</UserId> ... How can i recieve it in action of 2-nd project? [HttpPost] public ActionResult Index(MyObject id) { ... or like string, and deserialize after? Thanx.

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• Rails 4 json return on API

  - by El - Key

  I'm creating an API on my application. I currently overrided the as_json method in my model in order to be able to get attached files as well as logo from Paperclip : def as_json( options = {} ) super.merge(logo_small: self.logo.url(:small), logo_large: self.logo.url(:large), taxe: self.taxe, attachments: self.attachments) end Then within my controller, I'm doing : def index @products = current_user.products respond_with @products end def show respond_with @product end The problem is that on the index, I don't want get all the attachments. I only need it on the show method. So I tried it : def index @products = current_user.products respond_with @products, except: [:attachments] end But unfortunately it's not working. How can I do to not send :attachments? Thanks

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• Ripping a CD to mp3 in C# - third party component or api out there?

  - by Jonathan Williamson

  We're working on a project that requires the ripping of audio tracks from CDs to MP3s (ideally also retrieving the track information from CDDB or similar). More background information: Various music labels send us CDs of music which we then deliver to people via an online delivery system. We're looking at automating the process of converting those CDs into MP3s with full track information where possible. We want to produce a simple desktop application that allows a member of editorial staff to setup the information about the new music we receive. To streamline the process we'd like to include the ripping of the audio and retrieval of the track information.

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• Validating call to web service against schema before sending request

  - by Cen

  I am calling a web service (written in Java) in my web app. I use the WSDL to generate proxy classes using the wsdl.exe command line tool. Everything is working fine. However, I have found out that the web service is not doing any data validation at all when they receive a request from my app. Hence, if I happen to send one minute piece of data that isn't exactly what they want, I receive a general fault error in return, with no specifics at all of what the incorrect (if any) piece of data is. So, before I make the request, I'd like to validate my request against the schema they have provided. Is this possible, and if so, how do I go about this? Thanks in advance

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• Generating link path with parameters

  - by fl00r

  Hi. I've got model with many associations. User :has_many = :posts, :videos, :images etc I've got helper method, which receives one of this association draw_chart user.videos def draw_chart(assoc) assoc.each do |a| link_to "update", [a.user, a], :method => :put, :remote => true, :confirm => 'orrly?' end end Problem here is to send extra parameters to update action. For example I want to get this url: /users/1/videos/2?status=done but I am confused how to realize this while I am using [a.user, a] instead of user_videos_path(video, :status => 'done'). But I can't use last, because it can be either videos, or images or anything else

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• I need an efficient protocol between webservices that are more or less supported by all major langua

  - by corgrath

  Hey all. I am looking for a fast and efficient protocol that can be used between different web services to send text-data (not binary data). Doesn't matter if the protocol is binary or text base. Some conditions: I has to be more "efficient" than normal XML which adds a lot of extra data and the tools to read/write is too heavy It has to be "supported" by most major languages, meaning it cannot only be available for one specific language. At the moment, both Java and PHP have to be able to talk to each other using this protocol. I have already looked at: XML - which I am currently using. Hessian 2 -which works perfectly in Java, but the PHP-support is out of date JSON -the different between JSON and XML is only minor Any suggestions are welcome!

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• Uploading a file to AppEngine using GWT: How to provide feedback to the user?

  - by jcdmb

  Hello everyone, I have a GWT-FormPanel on my website, where people can upload pictures and answer some questions. It's working very well. The only problem is: I would like to provide a feedback to the user (for example: 0% to 100%) during the actual file process. But I have no idea how I can do that. I think that's a very common issue, that's why I would like to ask you guys if you know any tutorial or example that could help me to solve this problem. I've already tried GWT-Upload, but it does not do what I want: I have a submit button at the end of the FormPanel and the GWTUpload has it's own "SEND" button, which I don't want to have. Thanks in advance for helping and merry Christmas!

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• Connect to a website via HTTP in C

  - by sfactor

  i have a C code that parses a file and generates another file for the processed data. i now need to send these files to a web server (website). i guess there way is to do a HTTP POST. but i have never done this in c (Linux gcc compiler in ubuntu). Does anyone know how to do this. i need to a starting point as i have no clue of doing this in C. i also need to be able to authenticate with the website.

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• Submitting a form from Email

  - by bubbl

  I was working on a project to submit a form from an email. The scenario is this. We will send a form to list of emails where in the customer has to fill in the form and once they hit submit, the form should be submitted and server should be able to retrieve the values that is provided by the person filling in.When i tried, it was not considering the submit button as form submit and no action is being performed. Can anyone help me to resolve this. Thanks in advance.

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• Is it possible to set a parameterized build or pass an environment variable via a hudson build trigger?

  - by Tim

  I'd like to use hudson to trigger a "promotion" of a build. The build would be a simple script that just copies a release candidate installer file from one location to another. (development dir to release/stable dir) Our build server is not on the public internet, but I want to be able to send an email or a text message or an IM with the build number to hudson, which will parse the build number and then do the copy/move. In looking at the jabber/IM plugin it does not look like this is possible (the parameter part) Has anyone solved this in some way? Should I use some other mechanism? I would prefer not to have to do the manual steps each time (SCP/FTP, etc) - I just want any QA team member to be able to trigger the build server to do the promotion.

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