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• audioPlayerDidFinishPlaying not being called during scrolling UITableView

  - by Rob

  One of my views is a UITableView which acts as the delegate for an AVAudioPlayer and this table essentially plays sounds when you select a certain row with options to repeat the sound after its finished playing. However, I noticed that if I select a cell with repeat ON for a certain sound and then scroll through the UITableView to select a different sound, it will not call audioPlayerDidFinishPlaying (and therefore not repeat) until after scrolling has stopped. As soon as I stop scrolling, it repeats just fine. Or if I don't scroll at all, it repeats just fine. What could be happening during scrolling that the UITableView is no longer acting as the delegate and calling audioPlayerDidFinishPlaying? Any thoughts?

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• using AudioQueues with AudioFileReadBytes

  - by Santosh

  Hey Im trying to work with Audio queues to play a very big mp3 file (arround 23 hours long). when audio queue asks for buffers though callback, im using AudioFileReadBytes() API to read the bytes from audio file and feed the queue. startQueue fails with the error : prime failed any inputs????? Also I succeeded playing file using AudioFileReadPackets API instead of AudioFileReadBytes(). But the problem with API is that when I seek (fast forward) by a long interval, say 9 hours (for example fast forward from 32 mins playtime to 9:32 mins) then AudioFileReadPackets() takes a long time (almost 2 mins) to read from new location. any comments would be greatly appreciated.

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• Round-robin assignment

  - by Robert

  Hi, I have a Customers table and would like to assign a Salesperson to each customer in a round-robin fashion. Customers --CustomerID --FName --SalespersonID Salesperson --SalespersonID --FName So, if I have 15 customers and 5 salespeople, I would like the end result to look something like this: CustomerID -- FName -- SalespersonID 1 -- A -- 1 2 -- B -- 2 3 -- C -- 3 4 -- D -- 4 5 -- E -- 5 6 -- F -- 1 7 -- G -- 2 8 -- H -- 3 9 -- I -- 4 10 -- J -- 5 11 -- K -- 1 12 -- L -- 2 13 -- M -- 3 14 -- N -- 4 15 -- 0 -- 5 etc... I've been playing around with this for a bit and am trying to write some SQL to update my Customers table with the appropriate SalespersonID, but am having some trouble getting it to work. Any ideas are greatly appreciated!

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• How to view output .mp files from Functional MetaPost

  - by Jared Updike

  I'm interested in using Functional MetaPost on Mac OS X: http://cryp.to/funcmp/ I'm looking for a tutorial like: http://haskell.org/haskellwiki/Haskell_in_5_steps but for a trivial FuncMP example, i.e. using GHC, I can compile something simple such as: import FMP myPicture = text "blah" main = generate "foo" 1 myPicture but I can't figure out how to view this foo.1.mp output. (It gives a runtime error about not finding 'virmp'; my MetaPost binary is 'mpost'; I can't figure out how to override this Parameter or what my .FunMP file is or should be doing...) I can run mpost on that but the output (foo.1.1) is what, PostScript? EPS? How do I use this? (I imagine I just need a simple LaTeX file with an EPS figure in it or something...) Preferably, I'd like to generate output (.ps or .pdf that I can view) so I an actually get somewhere with Functional MetaPost, learning it, playing with it, not banging my head against paths and binaries and shell commands.

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• Accessing ruby counter cache

  - by Julian

  Hi all, I'm playing around with a fork of acts_as_taggable_on_steroids as a learning exercise. The version I'm looking at does some stuff I don't understand to calculate Tag counts. So I thought I'd do a version using PORC (Plain Old Rails Counters): class Tagging < ActiveRecord::Base #:nodoc: belongs_to :tag, :counter_cache => "tagging_counter_cache" ... I thought tagging_counter_cache was transparently accessed when I access tag.taggings.count but apparently not? Do I really have to access tag.tagging_counter_cache explicitly? >> tag.taggings.count SQL (0.7ms) SELECT count(*) AS count_all FROM `taggings` WHERE (`taggings`.tag_id = 16) Same for size. It's cool if that's the case but just wanted to check.

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• Returning value of static property from public instance property

  - by Jamie Dixon

  I was just playing around with some code in LINQPad and managed to crash the program with a stackoverflow exception. I basically created a static property in a class and used another property to return the value from an instance. The getter of my instance property would return the value of the static property, but the setter would set itself. When would this type of pattern be used and how come it generated a stackoverflow exception? Code example of what I did: void Main() { SomeClass myinstance = new SomeClass(); SomeClass.x = "Some Value"; myinstance.y = "Some other value"; myinstance.y.Dump(); } public class SomeClass { public static string x; public string y { get { return x; } set { y = value; } } }

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• Microphone audio streaming from Cocoa mac app to iPhone

  - by Benzamin

  Hi devs, I'm trying to build a microphone audio streamer to iPhone. The server software will be a mac desktop app and the client will be iPhone, and they are connected via tcp port. I've successfully connected the mac app and iPhone, and tried to send a fixed test.m4a audio file first. But at the iPhone i grabbed the data well, when tried to play it i used AVAudioPlayer and its returning OSStatus error. I played around with the audio queue service but its very tricky and i only got some example for fixed length audio playing like http://cocoawithlove.com/2009/06/revisiting-old-post-streaming-and.html Now i need help on two things, how can i continuously grab audio data from Mac desktop microphone? And then after grabbing the data how i can play this unfixed length audio data in the iPhone. What exactly i need to do? Please please help me on this......

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• Haskell's type system treats a numerical value as function?

  - by Long

  After playing around with haskell a bit I stumbled over this function: Prelude Data.Maclaurin> :t ((+) . ($) . (+)) ((+) . ($) . (+)) :: (Num a) => a -> (a -> a) -> a -> a (Data.Maclaurin is exported by the package vector-space.) So it takes a Num, a function, another Num and ultimately returns a Num. What magic makes the following work? Prelude Data.Maclaurin> ((+) . ($) . (+)) 1 2 3 6 2 is obviously not a function (a-a) or did I miss out on something?

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• What technical skills needed for algorithmic trading, HFT, etc?

  - by alchemical

  I'm interested in getting into developing trading systems, black box, HFT, etc. My primary experience is with C# and .Net (7 years). I've also done some sockets programming. I have some experience in finance working on analysis applications (2 years). My goal is to move into developing automated trading systems for a hedge fund, bank, etc. Is there any way to learn the skills needed for this without somehow getting the job first? I've looked at the open source tradelink, IB interactive brokerage, etc. I'm playing around with this framework, and may hook it up and do some paper trading. However, I'm not sure if this has much relationship with how a well-funded entity would be conducting a high-level automated trading operation. I.e. would the tools and frameworks they prefer be a totally different skill-set? Also wondering if I need to learn C++ and/or Java for these types of apps.

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• Yahoo authentication

  - by steve

  Hi - I'm playing around with the new yahoo API. I'd like to scrap some dummy data using the following address http://query.yahooapis.com/v1/public/yql?q=desc%20social.updates.search&format=json&diagnostics=true&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&callback=cbfunc When I run this I get an authenticaion error (Need to be logged into Yahoo) This is fine obviously for me messing around on the internet. However I'd like to call this from a ruby script. Any ideas how I go about authenticating? I can only seem to find some web enabled version.

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• iPhone drag/drop

  - by Farid

  Trying to get some basic drag/drop functionality happening for an iPhone application. My current code for trying to do this is as follows: - (void) touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event { UITouch *touch = [touches anyObject]; CGPoint location = [touch locationInView:self]; self.center = location; } This code has the result of a the touched UIView flickering while it follows the touch around. After playing around with it a bit, I also noticed that the UIView seemed to flicker from the 0,0 position on the screen to the currently touched location. Any ideas what I'm doing wrong?

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• ruby / rails / mysql performance degraded on Snow Leopard

  - by adamaig

  I've burned a bunch of hours on this. I'm not having problems getting things to build, but I am seeing that my test suite runs about 2x slower than when I was on OS X 10.5.x . I've spent a lot of time playing around with different optimization settings (learning to avoid homebrew's llvm-gcc compilation). I've just learned that I needed to tweaks /Library/Preferences/SystemConfiguration/com.apple.Boot.plist in order to get the kernel to boot in 64 bit mode. However, my rails app is still running a bit slower than before, even after warming up the mysql server. So what performance tweaks might i need to look into? Right now the stock ruby 1.8.7 runs faster than 1.9.1 for some things, and I'd really like to know if there is anything I should be looking for. All my dev software has been compiled for x86_64, mysql with -O2 optimization, using regular gcc (not llvm-gcc).

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• Distribute pre-compiled python extension module with distutils

  - by Toji

  Quick one today: I'm learning the in's and out's of Pythons distutils library, and I would like to include a python extension module (.pyd) with my package. I know of course that the recommended way is to have distutils compile the extension at the time the package is created, but this is a fairly complex extension spanning many source files and referencing several external libs so it's going to take some significant playing to get everything working right. In the meantime I have a known working build of the extension coming out of Visual Studio, and would like to use it in the installer as a temporary solution to allow me to focus on other issues. I can't specify it as a module, however, since those apparently must have an explicit .py extension. How could I indicate in my setup.py that I want to include a pre-compiled extension module? (Python 3.1, if it matters)

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• Looking for programs on audio tape/cassette containing programs for Sinclair ZX80 PC?

  - by DVK

  OK, so back before ice age, I recall having a Sinclair ZX80 PC (with TV as a display, and a cassette tape player as storage device). Obviously, the programs on cassette tapes made a very distinct sound (er... noise) when playing the tape... I was wondering if someone still had those tapes? The reason (and the reason this Q is programming related) is that IIRC different languages made somewhat different pitched noises, but I would like to run the tape and listen myself to confirm if that was really the case...

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• 2 questions about drag and drop with Javascript

  - by David

  Hello, I'm trying to be able to drag random highlighted text or images on a random page that is not written by me, thus I cannot simply wrap the text in a div and make it draggable. Is there any way to get highlighted text or images on a random page, like say Yahoo, and drop it into a container that can recognize what was being dropped into it (like content and content-type) without it even being an explicitly declared draggable? I've been playing with jQuery, but can't figure it out. Any help would be greatly appreciated. Regards, David

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• Flash in firefox does not start unitl they show in page

  - by Leonardo

  I have this little problem. My client wanted two distinct swf on a web page: a viewer on top and a slideshow of images at bottom. Clicking a link on the slideshow make the viewer load a movie, by means of LocalConnection api. The slideshow has a default, so when the page is loaded a default movie start. This works nice on all browser. The only problem I have is on firefox. When screen resolution is too low, or the monitor is too small (netbook) the slideshow remain hidden until scrolling. Therefore at page loading it doesn't start and the main viewer don't get instructed on playing the default video. As soon as I scroll the page, and the slideshow swf display on page, it starts and everything works fine. Do you know if there are any solution to this ? I cannot change the design, I must have two distinct swf, they come from a library he has, and I am trying to reuse components. thanks Leonardo

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• Grails easygrid plugin, Datatable implementation

  - by Robert Morning

  I'm playing with the datatable implementation in the Easygrid plugin and I have to say i love it but I have a question . If i use datatable directly (ie outside of Easygrid) to decorate a table i get a global search box defined above my table . If i use the Easygrid implementation and define my grid in a controller I get filters added for each column but no search box - it is added but then removed somehow either by easygrid itself or some parameter passed to datatable . How can I restore the search box and is this a bug as i would have thought the default implementation of datatable supplied via easygrid should match the default implementation supplied by the vanilla datatable itself? I'm using Grails 2.3.7 and Easygrid 1.6.2 .. Thanks

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• How to use Watin 64-bit with MSIE 32-bit

  - by dontomaso

  Hi, I have a C#-application running on Windows 7. I am using Watin to test some flash and quicktime movies in Internet Explorer. I am running in x64 mode due to some memory limitations I encountered in x86-mode. So I run my application which uses Watin, which starts MSIE. Watin starts the 64-bit version of MSIE. So far so good. The problem is, flash and quicktime do not seem to work in MSIE 64-bit, so testing playing of movies will not work. What must be done to run my C# application in 64-bit mode but to get Watin to run MSIE in 32-bit mode?

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• iPhone GPS Development - Tips + Tricks

  - by Keith Fitzgerald

  Hello - I'm looking for some feedback, blog links, etc that offer some tips and tricks for iPhone GPS development. I've read and understand the API, I have my demo app up and running, etc but I have run into some "quirks" with gps on iphone. For example, it seems that you you will receive a lot less location updates when your iphone enters "power save" mode. I've read that you can combat this by playing music in your application [not sure if this is true]. It also seems that, terms of making a reasonable pedometer, you should filter out any reading with horizontal accuracies less than 20 meters. Does this sound right? Is there any kind of checklist out on the web for iphone gps gotchas? Thanks in advance.

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• weird swing heavyweight object lightweight objects problem

  - by Yoav Schwartz

  Hello, We have a problem in our swing based application since we've upgraded our java version from 6u5 to 6u18 (The application runs over WinXP). Our application contains a Canvas object which resides in a JFrame. The application draws things on the canvas. Every time we drag a lightweight swing object (popup or another frame) over the canvas, it has a refresh problem. It blinks - becomes black. The problem only resolves after we move the swing component away from the canvas and click on it again. We think this problem is related to the fact the the canvas is a heavyweight object. And we know there were changes done in the new versions of java on the mixing of heavyweight and lightweight objects issue. Some more details: 1) Our problem reproduces in java 6u14 and 6u16. 2) Everything works fine in java 6u5. Another strange thing: We have 2 types of stations running our application. The first type has a ATI FireGL7100 PCI-E graphics card. The second type has a Matrox G450 PCI graphic card. The problem does not reproduce on the Matrox based station in any java version. One more thing: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6829858 - looks similar to our problem. Is our problem familiar? Do you have any suggestions (workarounds, ideas how the difference in graphics cards is connected to this problem) Hope I was clear enough, Yoav

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• VB Project Template for Monobjc in MonoDevelop?

  - by Ira Rainey

  After installing Monobjc and playing around with the Monobjc Application Project under C# in MonoDevelop, I noticed that there is only an empty Monobjc project under the VB section. Obviously this template adds all the correct references but doesn't add the basic files for the application to run. I've tried creating a class with: Imports System Imports Monobjc Imports Monobjc.Cocoa Class Application Public Sub Main(Byval args() As String) ObjectiveCRuntime.LoadFramework("Cocoa") ObjectiveCRuntime.Initialize() End Sub End Class Obviously I'm not loading the NIB there either, as I haven't added that in either, but if I try to build this I get: /Source/VB_Sample/VB_Sample/<MyGenerator>(1,1): Error VBNC30420: Could not find a 'Sub Main' in ''. (VBNC30420) (VB_Sample) Where should I be putting the Sub Main? Also if I add in a xib file from IB, how do I generate the designer code for the partial AppDelegate class? Any help would be appreciated.

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• How to avoid clobbering files when creating a tar archive

  - by Andrew Grimm

  This question notes that it is possible to overwrite files when creating a tar archive, and I'm trying to see how to avoid that situation. Normally, I'd use file roller, but the version installed is playing up a bit (using 1.1 Gb of memory), and I'm not the system administrator. I looked at --confirmation and --interactive, but that only asks me if I want to add file x to the archive, not whether I want to overwrite an existing file. For example, tar --interactive -czvf innocent_text_file.txt foo* Will ask me about each file, but is perfectly happy to overwrite innocent_text_file.txt Is there any switch that acts like -i for cp? Note I am asking about creating an archive, not extracting an archive. Clarification What I'm worried about is accidentally doing something like this tar -czvf * #Don't do this! which would overwrite the first file listed in the glob. To avoid it, I want tar to complain if the first file mentioned already exists, like cp -i * #Don't do this! would check if it would cause you to overwrite an existing file.

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• Where can I find the F# runtime for Silverlight 4

  - by Mark Pearl

  I have been playing around with Silverlight & F# and tried to make a Silverlight 4 application in VS2010 Professional. When I try and compile my application I get the following error message... Error 12 F# runtime for Silverlight version v4.0 is not installed. Please go to http://go.microsoft.com/fwlink/?LinkId=177463 to download and install matching.. For the life of me I cannot find the runtime on this page or a place to download it. Does anyone know of the actual URL

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• In windbg, how do I get a heap header address from !heap -l results?

  - by Kevin

  I am playing around with windbg's !heap command, particular the "-l" switch which detects memory leaks. When -l does detect a leak, I am having problems navigating from its results to a stack trace for the source of the leak. Here is a snippet of the results from !heap -l 0:066 !heap -l Searching the memory for potential unreachable busy blocks. Entry User Heap Segment Size PrevSize Unused Flags 0324b500 0324b508 01580000 03230000 20 60 a busy 0324b520 0324b528 01580000 03230000 20 20 a busy 0324b5c8 0324b5d0 01580000 03230000 20 28 a busy Windbg's documentation for !heap tells me to use dt _DPH_BLOCK_INFORMATION with the header address, followed by dds with the blocks' StackTrace field. But the output for !heap -l doesn't specify a header address! It's only specififying Entry, User, Heap, and Segment. I've racked my brain looking over the other commands but can't figure out how to get the header address from any of these fields. Can someone help?

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• PHP Stop Word List

  - by Dom Hodgson

  I'm playing about with a stop words within my code I have an array full of words that I'd like to check, and an array of words I want to check against. At the moment I'm looping through the array one at at a time and removing the word if its in_array vs the stop word list but I wonder if there's a better way of doing it, I've looked at array_diff and such however if I have multiple stop words in the first array, array_diff only appears to remove the first occurrence. The focus is on speed and memory usage but speed more so. Thanks

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