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• Efficient Map Overlays in on Android Google Map...

  - by Ahsan

  Hi Friends, I want to do the following and am kind of stuck on these for a few days.... 1) I have used helloItemizedOverlay to add about 150 markers and it gets very very slow.....any idea what to do ? I was thinking about threads....(handler) ... 2) I was trying to draw poly lines ( I have encoded polylines, but have managed to decoded those) that move when I move the map.....(the only solution that I found was for Geopoints to be transformed into screen co-ordinates...which wont move if I move the map !) 3) I was looking for some sort of a timer function that executes a given function, say, every 1 minute or so.... 4) I was also looking for ways to clear the Google map from all the markers/lines etc.... Thanks a lot... :) - ahsan

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• Django queries: Count number of objects with FK to model instance

  - by Chris Lawlor

  This should be easy but for some reason I'm having trouble finding it. I have the following: App(models.Model): ... Release(models.Model): date = models.DateTimeField() App = models.ForeignKey(App) ... How can I query for all App objects that have at least one Release? I started typing: App.objects.all().annotate(release_count=Count('??????')).filter(release_count__gt=0) Which won't work because Count doesn't span relationships, at least as far as I can tell. BONUS: Ultimately, I'd also like to be able to sort Apps by latest release date. I'm thinking of caching the latest release date in the app to make this a little easier (and cheaper), and updating it in the Release model's save method, unless of course there is a better way. Edit: I'm using Django 1.1 - not averse to migrating to dev in anticipation of 1.2 if there is a compelling reason though.

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• WPF - Drag from withing DataTemplate

  - by Gustavo Cavalcanti

  I have a ListBox displaying employees with a DataTemplate - it looks very similar to this screenshot. I want to be able to click on the employee photo, drag it and drop it somewhere out of the ListBox. How can I do that? I am not sure how to capture the PreviewMouseLeftButtonDown event of the Image, since it's inside the DataTemplate. Edit: The DataTemplate lives in a separate assembly and the drag/drop logic needs to be in the Window that has the ListBox. Edit2: I am thinking that the right way of doing this is using commands, am I right? Thanks!

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• Splitting assemblies - finding the balance (avoiding overkill)

  - by M.A. Hanin

  I'm writing a wide component infrastructure, to be used in my projects. Since not all projects will require every component created, I've been thinking of splitting the component into discrete assemblies, so that every application developed will only be deployed with the required assemblies. I assume that creating an assembly has some storage overhead (the assembly's code, wrapping whatever is inside). Therefore, there must be some limit to the advantage gained by splitting an assembly - a certain point where splitting the assembly is worse than keeping it united (storage-wise and performance-wise). Now, here is the question: how do I know when splitting an assembly is an overkill? P.S I guess there are other overheads to assembly splitting, aside from the storage overhead. If anyone can point out these overheads, it would be much appreciated.

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• jscript "Cannot retrieve referenced URL"

  - by jb

  I have javascript inside a .wsf file and I'm getting the error: C:\bin\LDLSInfo.wsf(53, 34) Windows Script Host: Cannot retrieve referenced URL: S:\tools\JScript\lib\StandardWSH.js At line 53, it says <script language="JScript" src="S:\tools\JScript\lib\StandardWSH.js"/> I know that LDLSInfo.wsf (the main script) and StandardWSH.js (the script to load) both work fine, because I've ran them from a different machine. It works fine on one machine and not on the other, both are Windows 7 x64 computers. So I'm thinking I'm missing some .dll's. Thanks for the help, -jb

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• options for producing audio with GWT

  - by Kaffeine Coma

  What options are there for producing audio in a GWT app? I'm thinking of making a simple game, but I'm disappointed to see that there's still not much progress on audio support directly in GWT (yes, I realize that's largely due to lack of underlying browser support; looking forward to HTML5!) This blog post says that "audio support in GWT is rapidly evolving", yet I don't see updates in over a year, at least not at that site. It seems these are the available options: GWT Voices GWT SoundManager GWT Sound GWT Incubator I believe most of these (all of them?) rely on Flash to produce audio. I'm most inclined to go with the GWT Incubator, as that's where features slated for inclusion in GWT get started, but I've no real recommendations to go on. I would appreciate hearing about your experiences with any of these libraries, thanks.

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• Complex String Processing - well complex to me

  - by percent20

  I am calling a web service and all I get back is a giant blob of text. I am left to process it myself. Problem is not all lines are necessarily the same. They each have 2 or 3 sections to them and they are similar. Here are the most common examples text1 [text2] /text3/ text1/test3 text1[text2]/text3 text1 [text2] /text /3 here/ I am not exactly sure how to approach this problem. I am not too good at doing anything advanced as far as manipulating strings. I was thinking using a regular expression might work, but not too sure on that either. If I can get each of these 3 sections broken up it is easier from there to do the rest. its just there doesn't seem to be any uniformity to the main 3 sections that I know how to work with.

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• What technologies should I focus on to work as a developer in Japan?

  - by Atomiton

  I'm thinking of one day moving to Japan and I was wondering if anyone here has any experience working there. I'm curious as to what languages/technology are popular there for web development and software development. I have heard Ruby is/was strong there due to its founder being Japanese. What would you recommend someone focus on if they wanted to work as a developer in Japan? I have heard Microsoft has a strong base in Japan, but my guess is that whatever platform has supported unicode or Shift-JIS the best would be the strongest.

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• C++ project type: unicode vs multi-byte; pros and cons

  - by Stefan Valianu

  I'm wondering what the Stack Overflow community thinks when it comes to creating a project (thinking primarily c++ here) with a unicode or a multi-byte character set. Are there pros to going Unicode straight from the start, implying all your strings will be in wide format? Are there performance issues / larger memory requirements because of a standard use of a larger character? Is there an advantage to this method? Do some processor architectures handle wide characters better? Are there any reasons to make your project Unicode if you don't plan on supporting additional languages? What reasons would one have for creating a project with a multi-byte character set? How do all of the factors above collide in a high performance environment (such as a modern video game) ?

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• Low level qemu based debugging

  - by Dacav

  I've to test some low level code on an ARM architecture. Typically experimentation is quite complicated on the real board, so I was thinking about QEMU. What I'd like to get is some kind of debugging information like printfs or gdb. I know that this is simple with linux since it implements both the device driver for the QEMU Integrator and the gdb feature, but I'm not working with Linux. Also I suspect that extracting this kind of functionality from the Linux kernel source code would be complicated. I'm searching from some simple operating system that already implements one of those features. Do you have some advice? Thanks in advance.

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• Parse values from a text file in C

  - by Mohit Deshpande

  Say I have written to a text file in this format: key1/value1 key2/value2 akey/withavalue anotherkey/withanothervalue I have a linked list like: struct Node { char *key; char *value; struct Node *next; }; to hold the values. How would I read key1 and value1? I was thinking of putting line by line in a buffer and using strtok(buffer, '/'). Would that work? What other ways could work, maybe a bit faster or less prone to error? Please include a code sample if you can!

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• Metaprograming - self explanatory code - tutorials, articles, books

  - by elena

  Hello everybody, I am looking into improving my programming skils (actually I try to do my best to suck less each year, as our Jeff Atwood put it), so I was thinking into reading stuff about metaprogramming and self explanatory code. I am looking for something like an idiot's guide to this (free books for download, online resources). Also I want more than your average wiki page and also something language agnostic or preferably with Java examples. Do you know of such resources that will allow to efficiently put all of it into prectice (I know experience has a lot to say in all of this but i kind of want to build experience avoiding the flow bad decitions - experience - good decitions)? Thank you!

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• Statistical approach to chess?

  - by Chinmay Kanchi

  Reading about how Google solves the translation problem got me thinking. Would it be possible to build a strong chess engine by analysing several million games and determining the best possible move based largely (completely?) on statistics? There are several such chess databases (this is one that has 4.5 million games), and one could potentially weight moves in identical (or mirrored or reflected) positions using factors such as the ratings of the players involved, how old the game is (to factor in improvements in chess theory) etc. Any reasons why this wouldn't be a feasible approach to building a chess engine?

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• setDelegate:self, how does it work?

  - by fuzzygoat

  I have a query regarding how delegates work. My understanding was that delegates take responsibility for doing certain tasks on behalf of another object. locationManager = [[CLLocationManager alloc] init]; [locationManager setDelegate:self]; [locationManager setDistanceFilter:kCLDistanceFilterNone]; [locationManager setDesiredAccuracy:kCLLocationAccuracyBest]; [locationManager startUpdatingLocation]; Am I right in thinking that in the example code above that the instance of CLLocationManager is created on a new thread so that it can get on with trying to find the location information it needs. When it completes its task (or encounters an error) it calls-back using the appropriate methods located in self e.g. locationManager:didUpdateToLocation:fromLocation: Essentially locationManager sends messages to self (which conforms to the correct delegate protocol) when things happen cheers gary

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• How can I use a regular expression to match something in the form 'stuff=foo' 'stuff' = 'stuff' 'mor

  - by PherricOxide

  I need a regexp to match something like this, 'text' | 'text' | ... | 'text'(~text) = 'text' | 'text' | ... | 'text' I just want to divide it up into two sections, the part on the left of the equals sign and the part on the right. Any of the 'text' entries can have "=" between the ' characters though. I was thinking of trying to match an even number of 's followed by a =, but I'm not sure how to match an even number of something.. Also note I don't know how many entries on either side there could be. A couple examples, '51NL9637X33' | 'ISL6262ACRZ-T' | 'QFN'(~51NL9637X33) = '51NL9637X33' | 'ISL6262ACRZ-T' | 'INTERSIL' | 'QFN7SQ-HT1_P49' | '()' Should extract, '51NL9637X33' | 'ISL6262ACRZ-T' | 'QFN'(~51NL9637X33) and, '51NL9637X33' | 'ISL6262ACRZ-T' | 'INTERSIL' | 'QFN7SQ-HT1_P49' | '()' '227637' | 'SMTU2032_1' | 'SKT W/BAT'(~227637) = '227637' | 'SMTU2032_1' | 'RENATA' | 'SKT28_5X16_1-HT5_4_P2' | '()' :SPECIAL_A ='BAT_CR2032', PART_NUM_A='202649' Should extract, '227637' | 'SMTU2032_1' | 'SKT W/BAT'(~227637) and, '227637' | 'SMTU2032_1' | 'RENATA' | 'SKT28_5X16_1-HT5_4_P2' | '()' :SPECIAL_A ='BAT_CR2032', PART_NUM_A='202649' Also note the little tilda bit at the end of the first section is optional, so I can't just look for that.

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• Back again to use Rails 2.3.5 from Rails 3

  - by dreame4

  Hi, Recently, I had seen information about Rails 3.0 beta and I had wanted to trial it. So I used gem update and installed this version. But now, I need to go back to Rails 2.3.5. How could I do it? I was thinking about this two solutions: Uninstalling Rails 3. I read that somebody removed Rails 3 by using gem uninstall but he came across some problems then. Did anyone try to remove it in this way? Using different versions Rails at the same time. Is it possible at all? It will resolve all my problems but I could find nothing about this issue in google. Hope somebody could help me :) Greetings, dreame4

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• php selecting hash using wildcards

  - by tipu

  Say I have a hashmap, $hash = array('fox' => 'some value', 'fort' => 'some value 2', 'fork' => 'some value again); I am trying to accomplish an autocomplete feature. When the user types 'fo', I would like to retrieve, via ajax, the 3 keys from $hash. When the user types 'for', I would like to only retrieve the keys fort and fork. Is this possible? What I was thinking was using binary search to isolate the keys with 'f', instead of brute-force searching. Then continue eliminating the indexes as the user types out their query. Is there a more efficient solution to this?

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• Cross Platform build

  - by Neeraj

  I have an application in which we use a hand-made build system.The reason for this is portability, the application should be portable on Linux/Mac/Windows. There are some port-specific files that are not updated by the deafult build system. What I do now is update the files manually or have a script do this. However I am thinking of switching to cross platform build system like cmake or scons. Are their associated problems wrt portability? Will it pay in long run? and if so what should be my choice "cmake", "scons" or some other(if any?). Thanks,

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• ASP.NET MVC TDD with LINQ and SQL database

  - by dean nolan

  I am trying to start a new MVC project with tests and I thought the best way to go would have 2 databases. 1 for testing against and 1 for when I run the app and use it (also test really as it's not production yet). For the test database I was thinking of putting create table scripts and fill data scripts within the test setup method and then deleting all this in the tear down method. I am going to be using Linq to SQL though and I don't think that will allow me to do this? Will I have to just go the ADO route if I want to do it this way? Or should I just use a mock object and store data as an array or something?. Any tips on best practices? How did Jeff go about doing this for StackOveflow?

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• TDD, DDD and the No-getters principle

  - by Justin

  Hi all, After several years of following the bad practice handed down from 'architects' at my place of work and thinking that there must be a better way, I've recently been reading up around TDD and DDD and I think the principles and practices would be a great fit for the complexity of the software we write. However, many of the TDD samples I have seen call a method on the domain object and then test properties of the object to ensure the behaviour executed correctly. On the other hand, several respected people in the industry (Greg Young most noticeably so) advocate the "no-getters" principle on our domain objects. My question therefore is: How does one test the functionality of a domain object if it is forbidden to retrieve its state? I believe I am missing something fundamental so please feel free to call me an idiot and enlighten me - any guidance would be greatly appreciated.

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• Review Board workflow for Mercurial repository

  - by pachanga

  At my company we are trying to add code reviewing practices into our development process and for that purpose we decided to use Review Board. While Review Board should work out of the box for Subversion the workflow for Mercurial looks a little bit involved. Firstly it seems that only post reviewing(via post-review script) is supported for this type of repo. Secondly documentation is unclear whether post-review actually supports Mercurial(it only mentions git). Could you folks describe your workflow in detail please? Am I right in my thinking it should be something like this: Developer: clone master repo clone feature repo from local master repo hack-hack in feature repo commit into feature repo somehow run post-review from feature repo against parent master repo Reviewer: review diff if OK then pull to the master repo from the feature repo

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• Determining if a .NET type is dynamic (created using Reflection.Emit)

  - by Diego Mijelshon

  While the .NET 4 framework provides the Assembly.IsDynamic method, that's not the case with .NET 2.0/3.5. The use case is simple: for logging purposes, I want to determine the underlying type name of an entity that might be wrapped by a dynamic proxy without having any references to NHibernate or Castle (which know about the proxy) For example, I might have a CatProxYadaYada, but I'm interested in Cat. What's the easiest way to get that type? I was thinking of this skeleton: var type = obj.GetType(); while (IsProxy_Dynamic_Whatever(obj)) type = type.BaseType; return type;

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• LinearLayout of a WebView and a Button.

  - by Timmmm

  Hi, I recently struggled with an apparently simple Android layout: I wanted a WebView above a Button. It worked fine with the following parameters: WebView: Height: wrap-content Weight: unset (by the way, what is the default?) Button: Height: wrap-content Weight: unset However if the web page became too big it spilled out over the button. I tried various combinations of weights and heights, and all except one either completely hide the button, or partially cover it. This is the one that works (copied from http://code.google.com/p/apps-for-android/source/browse/trunk/Samples/WebViewDemo/res/layout/main.xml): WebView: Height: 0 Weight: 1 Button: Height: wrap-content Weight: unset If you change any of those, e.g. give button a weight or change the WebView height to wrap-content then it doesn't work. My question is: Why? Can someone please explain what on Earth the android layout system is thinking?

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• Array Vs. Linked List

  - by Onorio Catenacci

  I apologize--this question may be a bit open-ended but I think there are probably definite, quantifiable answers to it so I'll post it anyway. A person I know is trying to learn C++ and software development (+1 to him) and he asked me why someone would want to use a linked list in preference to an array. Coding a linked list is, no doubt, a bit more work than using an array and he wondered what would justify the additional effort. I gave him the answer I know: insertion of new elements is trivial in linked list but it's a major chore in an array. But then I got to thinking about it a bit more. Besides the ease of insertion of a new element into a linked list are there other advantages to using a linked list to store a set of data vs. storing it in an array? As I said, I'm not meaning to start a long and drawn-out discussion. I'm just looking for other reasons that a developer might prefer a linked list to an array.

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• Large number array compression

  - by gatapia

  Hi All, I've got a javascript application that sends a large amount of numerical data down the wire. This data is then stored in a database. I am having size issues (too much bandwidth, database getting too big). I am now ready to sacrifice some performance for compression. I was thinking of implementing a base 62 number.toString(62) and parseInt(compressed, 62). This would certainly reduce the size of the data but before I go ahead and do this I thought I would put it to the folks here as I know there must be some outside the box solution I have not considered. The basic specs are: - Compress large number arrays into strings for JSONP transfer (So I think UTF is out) - Be relatively fast, look I'm not expecting same performance as I have now but I also don't want gzip compression either. Any ideas would be greatly appreciated. Thanks Guido Tapia

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