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  • How to determine the event of the linux devices?

    - by sasayins
    Hi, I am learning some embedded programming. I am using Linux as my platform and I want to create a daemon program that will check if a particular device(magstrife, keypad, etc) is active. Like for example, my daemon program is running in the background, then when I make a keypress event, my deamon app will do something. What implementation should I do to create this app? And how can I check the event of the devices? Thanks.

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  • Printer setup via VBA in Excel

    - by Gina
    I am trying to assign a cell in Excel for the user to type the printer name where they want the print out to go and then use that value in the Application.ActivePrinter = (use the cell value) Even though I have done the programming assigning a name to the cell and using it in a variable it is giving me an error. I have set my variable as string, text, object and variant already and it's not working. Do you know what code should I use to be able to do this?

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  • php: save me from dissapointment

    - by Syom
    i'm being dissapointed in programming when some issues can't be placed in my mind. i have file, which starts <?php session_start();?>, and it returns an error Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at C:\xampp2\htdocs\index.php:1) in C:\xampp2\htdocs\index.php on line 3 and now take a look at the moment, i can't anderstand anyway when i copy the all content of my file into another file, it start working. can somebody explain how can it happen. thanks

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  • Are there any good books to learn C++ if you already know Java and C#

    - by JF LR
    Hi, I would like to know if you have any good books that teach C++ programming without repeating basic stuff. In fact, I already well know Java and C#. I also have a basic knowledge in C and assembly, so I understand a little bit pointer arithmetic, manual memory management and heap based allocation. I was looking at O'Reilly's C++ in a Nutshell and was also wondering if this book would be a good choice. Thank you

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  • Upgrading PHP 5.1 to 5.3 on Linux Server

    - by nicorellius
    I trying to find the best way to upgrade from PHP 5.1 to 5.3. The CRM software I am running on this server requires this upgrade or else I probably wouldn't even perform it, because it seems like it's going to be perhaps trickier than I hoped it would be. Being still new to the programming world, these routine upgrades are still worrisome to me. I am running apache 2.2.6 (Fedora), PHP 5.1.6 and MySQL 5.0.27 on this server.

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  • Most popular mobile platform to develop on?

    - by Mohit Deshpande
    This question may not directly relate to programming. I have noticed that the technology of today has gone mobile. I want to go mobile with it. What is the most popular mobile OS?(excluding iPhone OS. Sorry, I don't have a Mac to develop on) Some choices could be BlackBerry OS, Windows Phone, Symbian OS, Android OS, etc. I want to make and sell applications for a mobile OS.

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  • Best IDE macro tools to combat the verbosity of Java syntax for someone with carpal tunnel?

    - by Carlsberg
    I have a bad case of carpal tunnel so I'm looking for an editor that would make my Java programming less painful (literally!). Does anyone have any recommendations for tools that you can add to Eclipse, Netbeans or other IDEs to produce some of the repetitive code that's common in Java syntax? Overall what would be the best code editor for this purpose? (I'm coding on Ubuntu, in case it matters).

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  • Creating a Virtual Webcam Device for OS X

    - by andsve
    I am looking for a solution to create a "virtual" webcam device under OS X (that acts just as a normal hardware webcam, but the application has full control over what to output). I'm fairly experienced with C++, but not so much with Objective-C and OSX/Cocoa programming. Anyone that can point me in the right direction, where to look and what I should be looking for? I've searched, but most of the results seems to focus on Windows and DirectX. Thanks!

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  • What is the proper way to credit public code snippets?

    - by Babiker
    This question might not be a programming problem, but its been bothering me. There is a lot of free js/css scripts out there for public use. I some times use these scripts. If any, what is the formal and proper way to credit these snippets when all i have is a name of a website and a url. I understand that a simple comment might get the job done but i wanted to know whether there is a more professional way.

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  • How do You Come Up With New Ideas?

    - by akdom
    Whenever I've come up with a new idea of something interesting to code, it has always been the "Eureka!" moment type deal. How do you come up with great programming ideas, and if you are having trouble coming up with something, how do you get past that block?

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  • How does UITableViewController knows its dataSource and delegate

    - by denniss
    I am following the BigNerdRanch iOS Programming book and I am on this one chapter that deals with UITableViewController. I have been wondering however where UITableViewController finds out about its delegate and dataSource. Currently I have it as @interface ItemsViewController : UITableViewController <UITableViewDataSource, UITableViewDelegate> But there is nothing that looks like: [self.tableView setDelegate:self] I am just wondering how the UITableViewController finds out about its delegate and dataSource

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  • Trying to understand the usage of class_eval

    - by eMxyzptlk
    Hello everyone, I'm using the rails-settings gem, and I'm trying to understand how you add functions to ActiveRecord classes (I'm building my own library for card games), and I noticed that this gem uses one of the Meta-programming techniques to add the function to the ActiveRecord::Base class (I'm far from Meta-programming master in ruby, but I'm trying to learn it) module RailsSettings class Railtie < Rails::Railtie initializer 'rails_settings.initialize', :after => :after_initialize do Railtie.extend_active_record end end class Railtie def self.extend_active_record ActiveRecord::Base.class_eval do def self.has_settings class_eval do def settings RailsSettings::ScopedSettings.for_thing(self) end scope :with_settings, :joins => "JOIN settings ON (settings.thing_id = #{self.table_name}.#{self.primary_key} AND settings.thing_type = '#{self.base_class.name}')", :select => "DISTINCT #{self.table_name}.*" scope :with_settings_for, lambda { |var| { :joins => "JOIN settings ON (settings.thing_id = #{self.table_name}.#{self.primary_key} AND settings.thing_type = '#{self.base_class.name}') AND settings.var = '#{var}'" } } scope :without_settings, :joins => "LEFT JOIN settings ON (settings.thing_id = #{self.table_name}.#{self.primary_key} AND settings.thing_type = '#{self.base_class.name}')", :conditions => 'settings.id IS NULL' scope :without_settings_for, lambda { |var| { :joins => "LEFT JOIN settings ON (settings.thing_id = #{self.table_name}.#{self.primary_key} AND settings.thing_type = '#{self.base_class.name}') AND settings.var = '#{var}'", :conditions => 'settings.id IS NULL' } } end end end end end end What I don't understand is why he uses class_eval on ActiveRecord::Base, wasn't it easier if he just open the ActiveRecord::Base class and define the functions? Specially that there's nothing dynamic in the block (What I mean by dynamic is when you do class_eval or instance_eval on a string containing variables) something like this: module ActiveRecord class Base def self.has_settings class_eval do def settings RailsSettings::ScopedSettings.for_thing(self) end scope :with_settings, :joins => "JOIN settings ON (settings.thing_id = #{self.table_name}.#{self.primary_key} AND settings.thing_type = '#{self.base_class.name}')", :select => "DISTINCT #{self.table_name}.*" scope :with_settings_for, lambda { |var| { :joins => "JOIN settings ON (settings.thing_id = #{self.table_name}.#{self.primary_key} AND settings.thing_type = '#{self.base_class.name}') AND settings.var = '#{var}'" } } scope :without_settings, :joins => "LEFT JOIN settings ON (settings.thing_id = #{self.table_name}.#{self.primary_key} AND settings.thing_type = '#{self.base_class.name}')", :conditions => 'settings.id IS NULL' scope :without_settings_for, lambda { |var| { :joins => "LEFT JOIN settings ON (settings.thing_id = #{self.table_name}.#{self.primary_key} AND settings.thing_type = '#{self.base_class.name}') AND settings.var = '#{var}'", :conditions => 'settings.id IS NULL' } } end end end end I understand the second class_eval (before the def settings) is to define functions on the fly on every class that 'has_settings' right ? Same question here, I think he could use "def self.settings" instead of "class_eval.... def settings", no ?

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  • what standards i should follow?

    - by moon
    i know it is not a programming related question but pretty much relate to IT field. i have to write a user manual for my product, and i am searching for a standard from last three days but i didn't find any useful information, can anyone guide me what standards exists there for this purpose (User Manual Writing ) , if there are some good suggestions that will also help me! thanx

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  • iphone sdk textbox

    - by Amy
    I'm learning programming iphone app. i need some help making a scrollable textbox with a image background. like the ipod music player with lyrics. thx

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  • Hidden features of PL/SQL

    - by Adam Paynter
    In light of the "Hidden features of..." series of questions, what little-known features of PL/SQL have become useful to you? Edit: Features specific to PL/SQL are preferred over features of Oracle's SQL syntax. However, because PL/SQL can use most of Oracle's SQL constructs, they may be included if they make programming in PL/SQL easier.

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  • Baby steps to get into Android application development

    - by Ra'ed Boshmaf
    I am in my semester vacation and i am looking to spend some time in learning how to develop Android application since this market is on fire these days, i have a background with programming and would like you to suggest ways or even sites that use baby steps tutorials to get an idea ( and hopefully ) create android application. Any suggestions would be great since i spend the last 2 days searching the web without finding what i am looking for thanks.

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  • Compare Quagga to XORP

    - by Sargun Dhillon
    What do you think of Quagga compared to XORP as a dynamic software routing engine? What are the technical merits of each engine comparatively? Additionally, what do most people think of them from a programming view. Who has manipulated networks using these enginers? I was wondering from an OSPF, routing, BGP protocol user's perpspective.

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  • How to detect if a doc document password protected

    - by StuffHappens
    Hello. I have a folder with lots of doc-documents and I need to upload their context into database. The problem is that some of them are password protected and I don't know the password. I would like to skip them but I don't know how to detect if password protection presents. If someone helps I'll appriciate it greatly. P.S. Programming language is C#.

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  • Looking for similar projects: Iphone/Android + Google Maps + "external" database = sightseeing map

    - by sniurkst
    Hello, sorry, it's not exactly a programming question, but I am currently in a research state and looking for similar projects, so I could analyze them: It should be application to iPhone or Android or other mobile platform, where, basically, user can access map with "places of interest" and add it's own "place of interest" (with photo and description). Kind of, community generated sightseeing map. I know it is quite simple and not a groundbreaking idea, but my google-fu is quite weak and I can't find anything like that.

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