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• acts_as_tree and to_json or from_json

  - by Sohan

  Hello: Does anyone have a solution to convert an acts_as_tree model to json that includes all its nodes? I trued using :include=:children, but that only goes down to one single level. Any idea how to iterate the whole tree?

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• [SQL server] How to insert artificial data into a select statement

  - by user149578

  Hi guys: Suppose we got a original query as follows: SELECT A, B, C FROM tblA Now, I need to additional artificial rows like SELECT 'Kyala', B, C FROM tblA when, for example, C = 100 to be inserted into the resultset. How could I achieve it using a single SQL instead of relying on table variable or temp table?

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• Is it standard behavior for this code to throw a NullPointerException?

  - by Eric

  I've had a big problem in some library code, which I've pinned down to a single statement: System.out.println((String) null); Ok, the code doesn't actually look like that, but it certainly calls println with a null argument. Doing this causes my whole applicaio to throw an unexpected NullPointerException. In general, should println throw this exception under that circumstance, or is this non-standard behavior due to a poor implementation of the out instance?

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• tag cloud filter help please

  - by rod

  Hi All, I have a div that contains many spans and each of those spans contains a single href. Basically it's a tag cloud. What I'd like to do is have a textbox that filters the tag cloud on KeyUp event. Any ideas or is this possible? Thanks, rodchar

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• Concurrent processes do not utilize all available CPU

  - by metdos

  I run some processes on an EC2 cc2.8xlarge instance which has 32 virtual processors. For some type of processes, when I run 16 processes on parallel, all of them use 100% of CPU cycles. But for other type of processes, they are not using 100% CPU and they finish considerably slower than a single thread. There is no time spend on IO and all data is served from memory. Do you have any idea about the reason of this problem?

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• JavaScript/jQuery removing character 160 from a node's text() value - Regex

  - by tyndall

  $('#customerAddress').text().replace(/\xA0/,"").replace(/\s+/," "); Going after the value in a span (id=customerAddress) and I'd like to reduce all sections of whitespace to a single whitespace. The /\s+/ whould work except this app gets some character 160's between street address and state/zip What is a better way to write this? this does not currently work.

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• Git: Ignoring certain commits when pushing

  - by int3

  I'd like to have some modifications that are private to my fork. How do I go about doing this? There's a question here about pushing a single commit, and the answer is to cherry-pick the commits you want to push from a private branch and put them on the main branch. However, I would like something more along the lines of ignoring a certain commit when pushing.

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• if i want to build logger class in c++ or java what should it be singletone or static

  - by user63898

  Hello all general question is i like to build logger class that writes to single log file from different classes in my application what should the logger class be singletone or static class

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• how to calculate power consumption on an Android mobile that uses wifi?

  - by Marco

  Hello, I have implemented a routing protocol on an Android 1.6 mobile that uses wireless (ad-hoc) network in order to exchange messages. Now I would like to evaluate it under an energy consumption point of view, the base would be to try to calculate the energy wasted to transmit a single packet, do anybody has any idea how to do that? Software/hardware solutions are welcome! Thanx :)

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• Jquery in chrome plugin

  - by Cyclone

  There is jquery on the page my script is trying to access, and the code I am trying to execute runs fine in console. However, when I use chrome.tabs.executeScript on that single tab, it says that $ is undefined. How can I fix this? Thanks for the help!

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• UDP port binding by multiple applications?

  - by moon

  hello i am trying to bind multiple applications running on different pc's across a single lan network is it a good idea when all applications are receiving on same port and sending at same port for example. app1 (receiving at 10000 port , sending at some ip2 and 10000 port) app2 (receiving at 10000 port , sending at some ip1 and 10000 port) any other good idea for performing this task is also accepted .

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• Play video in videoplayer using ffmpeg

  - by AndroidOptimist

  I am trying to play an video using ffmpeg. For this i referred ffmpeg-sample link wherein i can play my video successfully. Here the video is getting played as a bitmap image. Now i would like to play my video in mediaplayer by pressing a single play button with ffmpeg code. I googled this but i couldn't find an answer. Can u please help me in playing the video in player using ffmpeg (not using bitmaps).

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• Problem with MySQL query

  - by Psyche

  This time my setup looks like this: one table with galleries names (gallery_id, gallery_name) and another table with galleries photos (photo_id, photo_gallery_id, photo_name). What I need is to get all the galleries with one random picture for each gallery. Is it possible to do this with a single query?

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• What is the difference when a class extend from Handler and Thread? (In Android framework)

  - by XC

  What is the difference when a class extend from Handler and Thread? As described in developer.android.com ... Each Handler instance is associated with a single thread and that thread's message queue. ... Does the thread has no message queue ? Any benefit for a class extend from Handler?

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• How expensive is synchronization?

  - by someguy

  I am writing a networking application using the java.nio api. My plan is to perform I/O on one thread, and handle events on another. To do this though, I need to synchronize reading/writing so that a race condition is never met. Bearing in mind that I need to handle thousands of connections concurrently, is synchronization worth it, or should I use a single thread for I/O and event handling?

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• linked list problem

  - by progster

  Delete every 't'th (t1) node of a single linked list. In the resultant linked list, again delete 't'th node. Repeat this till only t-1 nodes remains. For this i have come up with: Traverse until you reach 't'th node, delete all the nodes till the end. Is there any efficient way other than this?. Can any one please help me out. Thanks.

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• Operating System Development

  - by j-t-s

  Hi All I'm looking for any website(s) devoted and/or related to Operating System Development, and would love for you to kindly share any links you may have. I have searched myself, but keep winding up at the same old sites, and am wondering if there are others that just don't get noticed by the major search engines or something. I've put this as a community wiki, simply because I don't think it's very fair to judge an answer based on a single link. Thank you.

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• Reduce Triangle in DirectX 9

  - by Himadri

  Hello everyone, I have a 3D object with about 2000 or 3000 triangles. I want to reduce the number of triangle without affecting shape of object. for eg, I have two triangles, (1,1.5,2) (1.5,1.5,2) (1.7,2,2) (1.5,1.5,2) (1.7,2,2) (2,1.5,2) In this case these two triangle is same as a single triangle - (1,1.5,2) (2,1.5,2) (1.7,2,2) I dont want the manual method, But if there is any direct function or such thing which will reduce my triangle list. Thank You.

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• Mef, passing parameters to a module

  - by Flex_Addicted

  Hi guys, I'm studying MEF and I'm not able to resolve a problem. I have a main application, called MainMEF, and a simple module, called SimpleModule. This one consists of a single UserControl which is loaded dinamically. When MainMEF starts up, I would be able to pass to the module a reference to main application contained into MainMEF. How could I fix this? Thanks in advance.

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• How to directly access a certain part of a text file in g++?

  - by Phenom

  I have a text file containing a number of records. Each record is stored on a single line that is 100 characters long. Let's say I want to directly access the nth record. I could do it using a for loop, reading in n lines until I get to the record. But how could I access it directly?

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• PHP coding - A class for each view or one class to rule them all?

  - by Kyle

  I am starting my first "programming" project in PHP making some sort of web application that give the linux program, Motion, a decent web interface. Anyways, I was curious as to how when real applications are programmed, do y'all go for a class for each view or one single class for the application altogether? I know this is more of a preference thing, I was just curious as to how it happens in real software.

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• How to prevent regex from stopping at the first match of alternatives ?

  - by miket2e

  If I have the string hello world , how can I modify the regex world|wo|w so that it will match all of "world", "wo" and "w" rather than just the single first match of "world" that it comes to ? If this is not possible directly, is there a good workaround ? I'm using C# if it makes a difference: Regex testRegex = new Regex("world|wo|w"); MatchCollection theMatches = testRegex.Matches("hello world"); foreach (Match thisMatch in theMatches) { ... }

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• How to retrieve from two tables with same foreign key repeated more than once?

  - by Sarenya

  How to display the data of tables that are linked by a primary key and foreign key where the foreign key of the data repeats? For ex. I have two tables, ParentTable and Childtable. The primary key of ParentTable acts as the foreign key of ChildTable. There are more than one record with same ParentId in ChildTable. How to retrieve them and display in a single Grid or List or any type of view?

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• How to remove all non-alphanumeric and non-space characters from a string in PHP?

  - by Daniel

  I want to remove all non-alphanumeric and space characters from a string. So I do want spaces to remain. What do I put for a space in the below function within the [ ] brackets: ereg_replace("[^A-Za-z0-9]", "", $title); In other words, what symbol represents space, I know \n represents a new line, is there any such symbol for a single space.

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• How to repeat an array in PHP?

  - by wamp

  $arr = array('1st', '1st'); The above $arr has 2 items , I want to repeat $arr so that it's populated with 4 items Is there a single call in PHP?

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