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• How does an interpreter switch scope?

  - by Dox

  I'm asking this because I'm relatively new to interpreter development and I wanted to know some basic concepts before reinventing the wheel. I thought of the values of all variables stored in an array which makes the current scope, upon entering a function the array is swapped and the original array put on some sort of stack. When leaving the function the top element of the "scope stack" is popped of and used again. Is this basically right? Isn't swapping arrays (which means moving around a lot of data) not very slow and therefore not used by modern interpreters?

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• How to reference an object in a lower fragment in android

  - by Silas Greenback

  I am trying to build a help screen that is going to go on a mediaplayer. The idea is to put a fragment with a transparent theme on top of the current view. (See How do I create a help overlay like you see in a few Android apps and ICS? for the basic idea). Now, I understand the steps in the mentioned link, but how do I connect the circles and arrows and paragraphs next to each one (explaining what each one was) to the lower object? Example, I have an object: R.id.music_button and I want there to be and arrow that points to music button. Trying to support as many devices as we do it will be very difficult to just draw a few pictures as part of the top layout and expect them to line up. Again, how do I reference an object on a fragment below the top level? Thanks

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• jQuery timer, ajax, and "nice time"

  - by Mil

  So for this is what I've got: $(document).ready(function () { $("#div p").load("/update/temp.php"); function addOne() { var number = parseInt($("#div p").html()); return number + 1; } setInterval(function () { $("#div p").text(addOne()); }, 1000); setInterval(function () { $("#geupdate p").load("/update/temp.php");} ,10000); }); So this grabs a a UNIX timestamp from temp.php and puts into into #div p, and then adds 1 to it every second, and then every 10 seconds it will check the original file to keep it up to speed. My problem is that I need to format this UNIX timestamp into a format such as "1 day 3 hours 56 minutes and 3 seconds ago", while also doing all the incrementation and ajax calls. I'm not very experienced with jquery/javascript, so I might be missing something basic.

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• How to stop the execution of Java program from Command line?

  - by Aakash

  My main field is .Net but recently I have got something to do with Java. I have to create a shell utility in Java that could run in background reading few database records after specified duration and do further processing. It's a kind of scheduler. Now I have few concerns: How to make this work as a service. I want to execute it through a shell script and the utility should start running. Off course the control should get back to the calling script. Secondly, eventually i may want to stop this process from running. How to achieve this? I understand these are basic question but I really have no idea where to begin and what options are best for me. Any help / advise please?

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• Can run Javascript but not jQuery?

  - by blazonix

  I'm running into a strange problem - I tried running a basic function in JS and jQuery, and while the former worked, the latter didn't. JS - okay alert('Works'); jQuery - not okay $(document).ready({ alert('Works'); }); Here's some facts: My references to the jQuery library are correct (And pretty sure my Internet connection is steady :) I'm using a CDN - CloudFlare to be exact, but I've switched development mode on and Rocket Loader off - so all the code I've uploaded to the server is WYSIWYG (CloudFlare adds some stuff in the tags if you leave Rocket Loader on. I tried running the alert code in the head section, and elsewhere in the body tags, to no avail. What could have possibly gone wrong? EDIT 1: The page is here - http://casestudieslounge.com/chat/BIM/WebContent/chat.php

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• Blackberry RepeatRule

  - by Vinay

  Hi All, I am very new to Blackberry development. I am trying to access the Blackberry Events (Calender) list. Currently, I am able to read the basic information from the event list. I am stuck in getting the info regarding the RepeatRule. My code is as below: EventList eventList = (EventList)PIM.getInstance().openPIMList(PIM.EVENT_LIST, PIM.READ_ONLY); Enumeration e = eventList.items(); while (e.hasMoreElements()) { Event event = (Event)e.nextElement(); RepeatRule rRule = event.getRepeat() ; if (rRule != null) { fieldIds = rRule.getFields() ; // Here I get the values as { 0,128,64,2}. How do I decode this information? } } Can any one help in decoding this information. Any kind of links, examples or pointers would be of great help. Thanks and regards, Vinay

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• MOSS search crawl fails with "Access is denied ..."

  - by strongopinions

  Recently the search crawler stopped working on my MOSS installation. The message in the crawl log is Access is denied. Check that the Default Content Access Account has access to this content, or add a crawl rule to crawl this content. (The item was deleted because it was either not found or the crawler was denied access to it.) The default content account is an admin on the site collection that I am trying to crawl. Almost every result for this error on Google tells me to add the DisableLoobackCheck registry key with a value of 1. I have done this and rebooted and the error continues. The "Do not allow Basic Authentication" checkbox in my crawl rule screen is unchecked. Is there anything else that could be causing this error? Something with file system or database permissions maybe?

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• correct way to store an exception in a variable

  - by Evan Teran

  I have an API which internally has some exceptions for error reporting. The basic structure is that it has a root exception object which inherits from std::exception, then it will throw some subclass of that. Since catching an exception thrown in one library and catching it in another can lead to undefined behavior (at least Qt complains about it and disallows it in many contexts). I would like to wrap the library calls in functions which will return a status code, and if an exception occurred, a copy of the exception object. What is the best way to store an exception (with it's polymorphic behavior) for later use? I believe that the c++0x futures API makes use of something like this. So what is the best approach? The best I can think of is to have a clone() method in each exception class which will return a pointer to an exception of the same type. But that's not very generic and doesn't deal with standard exceptions at all. Any thoughts?

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• Looking for a good Dynamic Imaging Solution

  - by user151289

  I work for a small E-Commerce shop and we are looking for a process that will handle resizing our product images dynamically. Currently our designers take high resolution photos, either provided by the manufactures or created in house, and alter them to fit various pages on our site. The designers are constantly resizing, cropping, altering compression levels, etc., of each product photo to fit the needs of the business. Being that our product line is updated frequently, this becomes a monotonous task. Abobe Scene7 does exactly what we are looking to do and the images are served up from a CDN. Unfortunately we found it to be too expensive. I'm curious to learn how others handle this process at their organizations. Does anyone know of any good 3rd party tools or other SAAS providers that can handle performing some basic image manipulation and serving them on the fly?

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• List of fundamental data structures - what am I missing?

  - by jboxer

  I've been studying my fundamental data structures a bunch recently, trying to make sure I've got them down cold. By "fundamental", I mean the real basic ones. Fancy ones like Red-Black Trees and Bloom Filters are clearly worth knowing, but they're usually either enhancements of fundamental ones (Red-Black Trees are binary search trees with special properties to keep them balanced) or they're only useful in very specific situations (Bloom Filters). So far, I'm "fluent" in the following data structures: Arrays Linked Lists Stacks/Queues Binary Search Trees Heaps/Priority Queues Hash Tables However, I feel like I'm missing something. Are there any fundamental ones that I'm forgetting about? EDIT: Added these after posting the question Strings (suggested by catchmeifyoutry) Sets (suggested by Peter) Graphs (suggested by Nick D and aJ) B-Trees (Suggested by tloach) I'm a little on-the-fence about whether these are too fancy or not, but I think they're different enough from the fundamental structures (and important enough) to be worth studying as fundamental.

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• Creating a standard card game (iPhone SDK)

  - by Chris

  I am trying to create a card game with a standard deck of cards. I need to be able to create a new card on screen every time someone draws a card from the deck and then be able to continuously move it throughout gameplay. I have image files for every card available in the game. I have tried creating a card object which held a UIImageView for the card along with some other basic data but I had trouble referring back to that card to move it again after the first touch. Was this the right way to do this?

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• trivial linux sound playback

  - by anon

  The classical C program is something like: int main() { fprintf(stderr, "hello world\n"); } a classical OpenGL program is: open up a window setup ortho view draw a colored triangle Now, I want to do the most basic thing for sound in Linux. I want to: 1) open up speakers 2) send a bunch of data, meant to be interpreted at 40Khz, 3) have pseakers play said data no midi, no instruments, ... just playing back raw data What is the easiest way to do this in a C program? [and what libraries; what's the equiv to OpenGL for sound?] Thanks!

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• Hibernate/JPA and PostgreSQL - Primary Key?

  - by Shadowman

  I'm trying to implement some basic entities using Hibernate/JPA. Initially the code was deployed on MySQL and was working fine. Now, I'm porting it over to use PostgreSQL. In MySQL, my entity class defines its primary key as an auto-incrementing long value with the following syntax: @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id; However, I've found that I get errors with PostgreSQL when I try and insert numerous records at a time. What do I need to annotate my primary key with to get the same auto-incrementing behavior in PostgreSQL as I have with MySQL? Thanks for any help you can provide!

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• Manipulating source packages from Hackage how to easy deploy to several windowsboxes?

  - by Jonke

  Recently when I have found good sources packages for ghc 6.12/6.10 on Hackage I've been forced to do some minor or major changes to the cabal files to make those packages to work under windows. Besides to fork and merge my fixes with github, what seems to be the best way/ good enough practice to take these modified builds to a couple of other windows boxes that only has a basic haskell platform installed? I should prefer if I somehow could work with the cabal-install because that is what one normally use. Should one put the modfied build dirs on a shared/networked dir and mount from the targeted windows box? Say something like this: on machine prepare cabal fetch foo cabal unpack foo cd foo edit .cabal and .hs cabal configure cabal build On machine useanddevelopnormal cd machinepreparemount cd foo cabal install

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• How should I handle searching through byte arrays in Java?

  - by Zombies

  Preliminary: I am writting my own httpclient in Java. I am trying to parse out the contents of chunked encoding. Here is my dilema: Since I am trying to parse out chunked http transfer encoding with a gzip payload there is a mix of ascii and binary. I can't just take the http resp content and convert it to a string and make use of StringUtils since the binary data can easily contain nil characters. So what I need to do is some basic things for parsing out each chunk and its chunk length (as per chunked transfer/HTTP/1.1 spec). Are there any helpful ways of searching through byte arrays of binary/part ascii data for certain patterns (like a CR LF) (instead of just a single byte) ? Or must I write the for loops for this?

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• Bypassing Windows Copy design

  - by Scott S

  I have been trying to figure out a way to streamline copying files from one drive (network or external in my case) to my main system drives. Short of creating a program that I will have to activate each time then choosing all the info in it, I have no really good design to bypass it. I have been wondering if there was a way to intercept a straight-forward windows copy with a program to do it my way. The basic design would be that upon grabbing the copy (actually for this to be efficient, a group of different copies), the program would organize all the separate copies into a single stream of copies. I've been wanting to do this as recently I have been needing to make backups of a lot of data and move it a lot as all my drives seem to be failing the past few months.

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• Learning how to program real things.

  - by Sean

  How would you guys recommend I actually learn to program real things? I mean, I know how to do basic academic things. I can implement a templated stack/queue/map/etc. data structure in C++ or Java or whatever. I can make a text-based hangman game or whatever. Etc etc. But how can I learn to program something real, something useful? I've done project Euler up to question 100 or so, and I feel like that's given me more mathematical maturity but not programming maturity. Should I buy a book and follow exercises, struggle through interesting projects, etc, ? In short, how did you guys transition from academic exercises to real, fun and/or useful programs?

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• Reading int from a hidden field in .aspx

  - by vikp

  Hi, I'm struggling to read an int from the hidden field on aspx page. <input type = "hidden" id = "myIntegerId" name = "integerId" value= "<%: Model.MyObjectId %>" runat = "server" /> The value is definately on the form, I can see it in the debugger and print it with <%: % When I read the form values in the controller, instead of an int I recieve a following string: <%: Model.MyObjectId % I have tried casting data in the hidden field to string and calling ToString() method on that field, neither has worked. The data is submitted using the post event. I have a feeling that I'm missing something very basic... Any help is greately appreciated. Thanks

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• Need help on how to begin learning website development

  - by Golfy

  OK for the past 10 days I have been trying to figure out where to begin learning website development a dynamic one, So far everyone told me you should start with computer science and I am like What the @#$% how am I suppose to learn computer science without going to school and get a degree but I don't want a degree I just want to learn how to devlope websites. So now I am here and confused about how to put together a website. I get HTML and CSS but still have some problems designing the site now on the other had I am having trouble trying to figure out how php and database mysql is used to put together a website. I have seen videos from lynda.com and still have no Idea after I have watched the video the basic one, one that teach you the Variables, Loops, Strings ext... ok than what happens, how do you build the website with it, that is the question I am real not understand the answer to. Any help will be appreciated.

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• PHP script for creating calendar table or jquery complete solution required

  - by finn_meister

  Ok so this is what I want to make: http://i44.tinypic.com/eiwphl.jpg red = booked green = available I have data in mysql in the format of: property_id, booked_from, booked_until . Before I start trying to create the correct loops etc to create and style the table, i thought i best ask if there are already good jquery plugins / php classes create this visual interface and uncluttered enough to allow me to add a select date range method (like Google Analytics)? I'm looking for something to create a basic calendar table on a loop, which i can then style and add jquery features. Though worth asking if there's a complete package that already does what i plan on making?!! (jquery ui's date-picker doesn't look powerful enough / easy enough to modify)

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• Ajax routes in Rails 3

  - by Jatin

  In my Rails 2.3 application, the following routes were working properly map.ajax 'ajax', :controller => 'widgetresponse_controller' , :action => 'getWidgetJson' When I migrated to Rails 3, I tried a number of new routes, to get this working but none of them worked. 1. match 'ajax' => 'widgetresponse#getWidgetJson', :as => :ajax 2. match 'ajax' => 'widgetresponse_controller#getWidgetJson', :as => :ajax 3. get 'widgetresponse/getWidgetJson', :as => :ajax 4. get 'widgetresponse/getWidgetJson' Its a very basic question to ask, but I don't know what I am doing wrong.

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• Bitwise operators versus .NET abstractions for bit manipulation in C# prespective

  - by Leron

  I'm trying to get basic skills in working with bits using C#.NET. I posted an example yesterday with a simple problem that needs bit manipulation which led me to the fact that there are two main approaches - using bitwise operators or using .NET abstractions such as BitArray (Please let me know if there are more build-in tools for working with bits other than BitArray in .NET and how to find more info for them if there are?). I understand that bitwise operators work faster but using BitArray is something much more easier for me, but one thing I really try to avoid is learning bad practices. Even though my personal preferences are for the .NET abstraction(s) I want to know which i actually better to learn and use in a real program. Thinking about it I'm tempted to think that .NET abstractions are not that bad at, after all there must be reason to be there and maybe being a beginner it's more natural to learn the abstraction and later on improve my skills with low level operations, but this is just random thoughts.

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• Error openin microsoft.com with google chrome

  - by Ilnur

  Hi! I need help with my browsers. In my OS (windows 7 basic) installed 2 browsers: IE 8 and Google Chrome. When I trying to open pages, which associated with microsoft.com (like ms live and others), my browser crashes. IE 8 crashes too. But Opera (I've installed it later) works fine with that pages. P.S. I tried to search the trojan software and viruses. But my PC is clean.

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• Starting Frame-By-Frame Animation

  - by OceanBlue

  Hi, I have a basic question about starting a frame-by-frame animation. When I call the AnimationDrawable.start() method from my code directly, it doesn't seem to work. public void onCreate(Bundle savedInstanceState) { ... mAnimation.start(); ... } But if I put this line inside the onClick() callback method of a button, pressing the buton starts the animation. Why doesn't this line work in the code? Thanks!

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• AppEngine dev_appserver.py not showing any outputs

  - by shin

  I installed Python2.6 and Google App Engine (GAE). I realized that GAE does not run on 2.6, so I installed 2.5 as well. Now I have a very basic code as follows and it does not show on the localhost:8080 I typed the following in cmd.exe under my dir testapps. c:\Users\myname\testapps"\Program Files\Google\google_appengine\dev_appserver.py" helloworld I am hoping someone lead me to the right direction. helloworld/helloworld.py print 'Content-Type: text/plain' print '' print 'Hello, world!' helloworld/app.yaml application: helloworld version: 1 runtime: python api_version: 1 handlers: - url: /.* script: helloworld.py

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