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• what is the best way to stream a audio file to website users/listners

  - by Naveen Chamikara Gamage

  I'm developing a music site which will stream audio files stored in a server to users, audio files will be played through flash player placed in a webpage.. As I heard I need to use a streaming media server for streaming audio files ( like 2mb to 3mb in size).. Do I need to use one? I found some streaming media server softwares like http://www.icecast.org - but as in their documentation, It is used for streaming radio stations and live streaming purposes, but I just need to stream audio files faster and in low size (low bandwidth) with good quality.. I heard I need to encode the audio files first and then send them to listeners and in their end audio files need to be decoded again. Is that true? How can I do that? if I need to use a special web server, where should I host my files? Any good hosting providers? if I host audio files in a normal web server, they will use HTTP or TCP to deliver my audio files to users/ listners but I found that HTTP and TCP are not good ways to use for multi media purposes like streaming audio and video files, and they are used for delivering HTML and stuff. I found I should use RSTP or UDP for streaming audio files.. What should I use? I know that .MP3 files has much better quality than the other formats but it also gives huge size to the audio files.. which format should I use for audio files? Most of the best quality audio files are more than 7mb so I'm planning to convert them my self using a software so I could get low size files with some level of good quality. If I'm converting my audio files what is the good BITRATE I should use for my files? Any known best softwares for converting audio files while keeping quality in a good level? Note** - I know that I will not need complex requirements at the beginning of the site but I wanted to what are the best ways like they are using for soundcloud.com

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• WCF: WTF! Does WCF raise the bar or just the complexity level?

  - by rp

  I understand the value of the three-part service/host/client model offered by WCF. But is it just me or does it seem like WCF took something pretty direct and straightforward (the ASMX model) and made a mess out of it? Is there an alternative to using SvcUtil's command line step back in time to generate the proxy? With ASMX services a test harness was automatically provided; is there a good alternative today with WCF? I appreciate that the WS* stuff is more tightly integrated with WCF and hope to find some payoff for WCF there, but geeze, otherwise I'm perplexed. Also, the state of books available for WCF is abysmal at best. Juval Lowy, a superb author, has written a good O'Reilly reference book "Programming WCF Services" but it doesn't do that much (for me anyway) for learning now to use WCF. That book's precursor (and a little better organized, but not much, as a tutorial) is Michele Leroux Bustamante's Learning WCF. It has good spots but is outdated in place and its corresponding Web site is gone. Do you have good WCF learning references besides just continuing to Google the bejebus out of things? Thanks, rp

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• Use any CSS compiler (Sass, Less) to generate the selector

  - by xckpd7

  So I've recently been playing around with CSS compilers, but I have no idea how (or if it's possible) to dynamically generate pieces of a selector. For instance, let's say I wanted to make mixins to get display: inline-block; to work cross browser. I would have to do the styles, yeah, but I would have to do the IE6/7 selector hacks to get them to work in those browsers too. Ideally I'm looking for a one off thing to add to an element and have the ability for that to work. Some kind person recently gave me this solution: http://stackoverflow.com/questions/2746754/css-compilers-and-converting-ie-hacks-to-conditional-css/2747036#2747036 and it would be nice to implement that in a minimal way that would allow me to specify it for a given element and be on my way (for instance in Less, you can create a class with styles, pass that class to another element, and that element will inherit all of those styles. It would be nice to pass an element .inline-block; and it create the styles needed to support IE6/7 without having to resort to stuff like _color: pink; Any ideas? EDIT: for instance as well, how could I do something like clearfix for LESS? (lesscss.org)? If Sass can only do it then that will work too.

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• Setting up a "cookieless domain" to improve site performance

  - by Django Reinhardt

  I was reading in Google's documentation about improving site speed. One of their recommendations is serving static content (images, css, js, etc.) from a "cookieless domain": Static content, such as images, JS and CSS files, don't need to be accompanied by cookies, as there is no user interaction with these resources. You can decrease request latency by serving static resources from a domain that doesn't serve cookies. Google then says that the best way to do this is to buy a new domain and set it to point to your current one: To reserve a cookieless domain for serving static content, register a new domain name and configure your DNS database with a CNAME record that points the new domain to your existing domain A record. Configure your web server to serve static resources from the new domain, and do not allow any cookies to be set anywhere on this domain. In your web pages, reference the domain name in the URLs for the static resources. This is pretty straight forward stuff, except for the bit where it says to "configure your web server to serve static resources from the new domain, and do not allow any cookies to be set anywhere on this domain". From what I've read, there's no setting in IIS that allows you to say "serve static resources", so how do I prevent ASP.NET from setting cookies on this new domain? At present, even if I'm just requesting a .jpg from the new domain, it sets a cookie on my browser, even though our application's cookies are set to our old domain. For example, ASP.NET sets an ".ASPXANONYMOUS" cookie that (as far as I'm aware) we're not telling it to do. Apologies if this is a real newb question, I'm new at this! Thanks.

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• Overlay an HTML page with an HTML form

  - by jah

  Hi folks, this is a question about the best way (or least effort of the best ways) to overlay an html page with a form. Best in this context meaning best user experience whilst meeting the functional requirements. Let's say I have a page with a short form on it; the user has to enter some financial details. To assist the user to enter an accurate value for one of the fields there's another, much longer form. The longer form needs to be displayed only if the user requests the help. For users without javascript, clicking a link will submit the short form (persisting already filled fields in a session) and the server will respond with the long form. They'll submit the long form and the server will combine the submitted data with the persisted data and serve the short form again - with the fields populated. For users with javascript I want to overlay the short form page (in a lightbox stylee) with the long form, allow them to populate the long form and then go back to the short form with less round-trips to the server. Do I: Overlay the short form page with an iframe whose target is the long form? Request the long form over ajax and stuff it into a div? Generate the long form entirely on the client-side? Some other wizadry I haven't thought of? A short explanation of the best mechanism will do me very nicely indeed. Thank you very much!

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• JAX-WS and JPA, how to load stub objects using JPA?

  - by opensas

  I'm trying to develope a soap web service that has to access a mysql db. I have to replicate an existing service, so I created all the stub object from it's wsdl file Netbeans created all the necessary stuff for me (new, web service from wsdl), it works ok... Now I'm trying to use JPA to load all those objects from the database. So far I was going fine, I created the classes using (new, entity class from database), and then copied all the annotations to the classes generated by wsimport, and it was working fine. The problem is that netbeans insists on running wsimport again, and then I loose all my annotations... Is there some way to tell netbeans not to regenerate those files? I think this situation shoulb be pretty common, I mean developing a web service from a wsdl and then having to fill those objects with data using JPA. what would be the correct aproach to this kind of situation? thanks a lot saludos sas I've also tried inheriting from the stubs, and addign there the persistence annotations, but I had troubles with overlaping members, I'm redeclaring protected properties...

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• How to load static files from view HTML in web2py?

  - by MikeWyatt

  Given a view with layout, how can I load static files (CSS and JS, essentially) into the <head> from the view file? layout.html <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="{{=T.accepted_language or 'en'}}"> <head> <title>{{=response.title or request.application}}</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <!-- include requires CSS files {{response.files.append(URL(request.application,'static','base.css'))}} {{response.files.append(URL(request.application,'static','ez-plug-min.css'))}} --> {{include 'web2py_ajax.html'}} </head> <body> {{include}} </body> </html> myview.html {{extend 'layout.html'}} {{response.files.append(URL(r=request,c='static',f='myview.css'))}} <h1>Some header</h1> <div> some content </div> In the above example, the "myview.css" file is either ignored by web2py or stripped out by the browser. So what is the best way to load page-specific files like this CSS file? I'd rather not stuff all my static files into my layout.

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• Dynamic controls not creating with RSS reader function

  - by TuxMeister

  Hello, I am working on a test project for an RSS reader. I am using Chilkat's module for .NET 3.5. What I am trying to do is this: For each item in the RSS feed, I want to dynamically create some controls (labels) that contain stuff like the title, the link and the publication date. The problem is that only the first control comes up "rssTitle", but not the rest and it's definitely not creating the rest, nor cycling through the RSS items. Any ideas where I'm wrong in my code? Imports Chilkat Public Class Form1 Dim rss As New Chilkat.Rss Dim success As Boolean Dim rssTitle As New Label Dim rssLink As New Label Dim rssPubDate As New Label Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click success = rss.DownloadRss("http://www.engadget.com/rss.xml") If success <> True Then MessageBox.Show(rss.LastErrorText) Exit Sub End If Dim rssChannel As Chilkat.Rss rssChannel = rss.GetChannel(0) If rssChannel Is Nothing Then MessageBox.Show("No channel found.") Exit Sub End If Dim numItems As Long numItems = rssChannel.NumItems Dim i As Long For i = 0 To numItems - 1 Dim rssItem As Chilkat.Rss rssItem = rssChannel.GetItem(i) Me.Controls.Add(rssTitle) With rssTitle .Name = "rssTitle" & Me.Controls.Count.ToString + 1 .Text = "Title: " & rssItem.GetString("title") .Left = 12 .Top = 12 End With Me.Controls.Add(rssLink) With rssLink .Name = "rssLink" & Me.Controls.Count.ToString + 1 .Text = "Link: " & rssItem.GetString("link") .Left = 12 .Top = 12 End With Me.Controls.Add(rssPubDate) With rssPubDate .Name = "rssPubDate" & Me.Controls.Count.ToString + 1 .Text = "Pub date: " & rssItem.GetString("pubDate") .Left = 12 .Top = 12 End With Next End Sub End Class I'm grateful for any help. Thanks!

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• Jersey / ServletContext and resource loading on startup.

  - by Raphael Jolivet

  Hello, I'm kind of new in web development with Java. I am developing a web service and I've chosen REST / Jersey for it. I want to init some stuff on startup of the service and to keep them all along the life of the service. First question : Is the constructor of the Jersey Servlet a good place to do that ? Basically, what I want to do is to load a config.ini file located in my WEB-INF directory. Following this help, I understand I need a ServletContext to load my file as a resource. However, it is not clear to me how to get this ServletContext in a Jersey Servlet, as it is not really an instance of a servlet, but rather a POJO with some annotations. I wanted to try this tip, but the attribute "context" is null in the constructor. I think that Jersey might populate it after the constructor. Right ? So how is the right way to do this ? Here is my code so far : /** Main REST servlet */ @Path("/") public class Servlet { // ---------------------------------------------------- // Constants // ---------------------------------------------------- static private final String CONFIG_PATH = "/WEB-INF/config.ini"; // ---------------------------------------------------- // Attributes // ---------------------------------------------------- /** Context */ @Context ServletContext context; // ---------------------------------------------------- // Constructor // ---------------------------------------------------- /** Init the servlet */ public Servlet() { // Load config.ini from WEB-INF Config.config = new Config( this.context.getResourceAsStream(CONFIG_PATH)); // FAIL! this.context is null ... } // ---------------------------------------------------- // URI Handlers // ---------------------------------------------------- /** Welcome page */ @GET @Path("/") @Produces(MediaType.TEXT_HTML) public String welcome() { return "<h1>Hi there.</h1>"; } } Any help would be much appreciated. Thanks in advance, Raphael

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• Problem with javascript onclick function string

  - by StealthRT

  Hey all, i have been trying for a few minutes on this problem and i can not seem to figure out how to correct it. I tend to have the hardest time doing stuff like this when it involves more than one varable within the function. Here is the code: var tempString = "thePrompt('Are you sure you wish to delete this?', 'theDel('" + IDnum + "', '" + theTitle + "', \'" + temperDay + "\', \'" + temperMonth + "\', \'" + temperYear + "\', \'" + DDiff + "\')"; html += "<div id='theTable" + IDnum + "' class='fc-event fc-event-hori fc-corner-left fc-corner-right' style='position:absolute; margin-top: 15px; z-index:8;left:"+left+"px'><div id='apDEL' style='position:relative;width:0px;height:0px;z-index:1000; top:-13px; left:2px; float:left;'><img src='img/xCal.png' width='15' height='15' alt='' border='0' onclick=\"" + tempString + "\" /></div>" + (ETC ETC...) The error i keep getting is this: Error: missing ) after argument list Line: 1, Column: 68 Source Code: thePrompt('Are you sure you wish to delete this posting?', 'theDel('105', '50 points for visiting us today!!!!', '13', '3', '2010', '2') And its pointing to the '105'. As always, any help would be wonderful! :o) David

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• Webservices on iPhone - wsdl2objc - Sample Code?

  - by markmcgookin

  I have recently downloaded the most recent build of this awesome tool WSDL2OBJC from google code here: http://code.google.com/p/wsdl2objc/ After a bit of tweaking and downloading the latest version of the trunk from the svn repo I got a version that created the code for a WSDL I am using and compiles great and actually installs on my phone! However, I'm not doing anything with it yet, because I am not really sure how to. There is very little in the way of sample code on the site, and there is a sample file in the project if you download it, but again it is very complicated and there are no real bits of documentation. Has anyone managed to successfully use this stuff? It seems SOOO powerful and useful but from a look around the Internet, no one knows how to use it. We (all) would love someone who has figured it out to post a simple project or detailed walk-through of implementing this so we can put the code that lots of people have worked hard on to good use. If anyone has found a blog entry or has this information it would be great to see! I am totally stuck... with no errors. I would love to know how to use this now that it's all compiled successfully!

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• API Wrapper Architecture Best Practice

  - by Adam Taylor

  Hi, So I'm writing a Perl wrapper module around a REST webservice and I'm hoping to have some advice on how best to architect the module. I've been looking at a couple of different Perl modules for inspiration. Flickr::Simple2 - so this is basically one big file with methods wrapping around the different methods in the Flickr API, e.g. getPhotos() etc. Flickr::API - this is a sub-class of another module (LWP) for making HTTP requests. So basically it just allows you to make calls through the module, using LWP, that go to the correct API method/URL without defining any wrapper methods itself. (That's explained pretty poorly - but basically it has a method that takes an argument (a API method name) and constructs the correct API call). e.g request() / response(). An alternative design would be like the first described, but less monolithic, with separate classes for separate "areas" of the API. I'd like to follow modern/best practice Perl methods so I'm using Dist::Zilla to build the module and Moose for the OO stuff but I'd appreciate some input on how to actually design/architect my wrapper. Guides/tutorials or pointers to other well designed modules would be appreciated. Cheers

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• LogonUser -> CreateProcessAsUser from a system service

  - by Josh K

  I've read all the posts on Stack Overflow about CreateProcessAsUser and there are very few resolved questions, so I'm not holding my breath on this one. But it seems like I'm definitely missing something, so it might be easy. The target OS is Windows XP. I have a service running as "Local System" from which I want to create a process running as a different user. For that user, I have the username and password, so LogonUser goes fine and I get a token for the user (in this case, an Administrator account.) I then try to use that token to call CreateProcessAsUser, but it fails because that token does not come with SeAssignPrimaryTokenPrivilege - however, it does have SeIncreaseQuotaPrivilege. (I used GetTokenInformation to dump all the privileges associated with that token.) According to the MSDN page for CreateProcessAsUser, you need both privileges in order to call CreateProcessAsUser successfully. It also says you don't need the SeAssignPrimaryTokenPrivilege if the token you pass in to CreateProcessAsUser() is a "restricted version of the calling process' primary token", which I can create with CreateRestrictedToken(), but then it will be associated with the Local System user and not the target user I'm trying to run the process as. So how would I create a logon token that is both a restricted version of the calling process' primary token, AND is associated with a different user? Thanks! Note that there is no need for user interaction in here - it's all unattended - so there's no need to do stuff like grabbing WINSTA0, etc.

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• Can't get past "A potentially dangerous Request.Form value was detected..." error

  - by joshb

  I'm doing my first ASP.NET MVC2 project and I can't get past the "A potentially dangerous Request.Form value was detected..." error when trying to submit a form. I've done this in MVC1 using the ValidateInputAttribute and I've read about the breaking change in .NET 4 that requires setting the request validation mode in the web.config. Basically I'm doing exactly what is outlined in this thread: http://stackoverflow.com/questions/2019843/a-potentially-dangerous-request-form-value-in-mvc-2-asp-net-4-0. Nothing's working though so I must be missing something. Here's my code: Web.config <configuration> <system.web> <httpHandlers> <add path="*" verb="*" type="System.Web.HttpNotFoundHandler"/> </httpHandlers> <httpRuntime requestValidationMode="2.0" /> <pages validateRequest="true" pageParserFilterType="System.Web.Mvc.ViewTypeParserFilter, System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" pageBaseType="System.Web.Mvc.ViewPage, System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" userControlBaseType="System.Web.Mvc.ViewUserControl, System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> <controls> <add assembly="System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" namespace="System.Web.Mvc" tagPrefix="mvc" /> </controls> </pages> </system.web> <system.webServer> <validation validateIntegratedModeConfiguration="false" /> <handlers> <remove name="BlockViewHandler"/> <add name="BlockViewHandler" path="*" verb="*" preCondition="integratedMode" type="System.Web.HttpNotFoundHandler" /> </handlers> </system.webServer> </configuration> Controller action [AcceptVerbs(HttpVerbs.Post)] [ValidateInput(false)] public ActionResult Edit(Page pageToEdit) { // do stuff.... } Any ideas on what I'm doing wrong here?

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• Neophyte question about using Subtotal and CountIf in Excel

  - by Andrew

  Hi, I'm using Excel and having some problems with Countif and I don't understand how it works differently from SubTotal. I used the GUI to subtotal stuff and all the subtotals are right. Then I attempted to use the Countif to see how many requirements passed. That worked for the first subtotal only. It's easy to see why. When I look at the box for the subtotal, it says: =SUBTOTAL(3,C286:C292) When I look at my formula for passed requirements, I have: =IF(ISTEXT(A285),COUNTIF(C286:C338,"=Passed"),"") Notice that the last column is wrong. How did the Subtotal manage to keep this correct? I typed in the formula for passed requirements and dragged it down the page. Everything behaved as expected (even the bit about ISTEXT dutifully figured out which row was which), but it got the last row wrong. Any ideas? SRS Maintenance Count 7 44 SRS Maintenance Passed SRS Maintenance Passed SRS Maintenance Passed SRS Maintenance Passed SRS Maintenance Passed SRS Maintenance Passed SRS Maintenance Passed SRS Reports Count 12 43 SRS Reports Passed SRS Reports Passed SRS Reports Passed SRS Reports Passed SRS Reports Failed SRS Reports Passed SRS Reports Passed SRS Reports Failed SRS Reports Passed SRS Reports Passed SRS Reports Failed

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• WPF animation/UI features performance and benchmarking

  - by Rich

  I'm working on a relatively small proof-of-concept for some line of business stuff with some fancy WPF UI work. Without even going too crazy, I'm already seeing some really poor performance when using a lot of the features that I thought were the main reason to consider WPF for UI building in the first place. I asked a question on here about why my animation was being stalled the first time it was run, and at the end what I found was that a very simple UserControl was taking almost half a second just to build its visual tree. I was able to get a work around to the symptom, but the fact that it takes that long to initialize a simple control really bothers me. Now, I'm testing my animation with and without the DropShadowEffect, and the result is night and day. A subtle drop shadow makes my control look so much nicer, but it completely ruins the smoothness of the animation. Let me not even start with the font rendering either. The calculation of my animations when the control has a bunch of gradient brushes and a drop shadow make the text blurry for about a full second and then slowly come into focus. So, I guess my question is if there are known studies, blog posts, or articles detailing which features are a hazard in the current version of WPF for business critical applications. Are things like Effects (ie. DropShadowEffect), gradient brushes, key frame animations, etc going to have too much of a negative effect on render quality (or maybe the combinations of these things)? Is the final version of WPF 4.0 going to correct some of these issues? I've read that VS2010 beta has some of these same issues and that they are supposed to be resolved by final release. Is that because of improvements to WPF itself or because half of the application will be rebuilt with the previous technology?

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• Best way to be able to pick multiple colors/designs of symbols dynamically from flash

  - by Cyprus106

  Sorry the title's so convoluted... I must've tried for ten minutes to get a good, descriptive title! Basically, here's the scenario. Let's say a user can pick fifty different hat colors and styles to put on an avatar. The avatar can move his head around, so we'd need the same types of movements in the symbol for when that happens. Additionally, it gets which hat should be on the 'avatar' from a database. The problem is that we can't just make 50 different frames with a different hat on each. And each hat symbol will have the same movements, it'll just be different styles, colors and sizes. So how can I make one variable that is the HAT, that way we can just put the appropriate hat symbol into the variable and always be able to call Hat.gotoAndplay('tip_hat') or any other generic functions.... Does that make sense? Hope that's not too confusing. Sorry, I'm not great at the visual Flash stuff, but it's gotta be done! Thanks!

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• A problem of trying to implement scrolling inertia with jQuery

  - by gargantaun

  I'm trying to add some iPhone style scrolling inertia to a web page that will only be viewed on the iPad. I have the scrolling working in one direction (scrollLeft), but it doesn't work in the other direction. It's a pretty simple function function onTouchEnd(event){ event.preventDefault(); inertia = (oldMoveX - touchMoveX); // Inertia Stuff if( Math.abs(inertia) > 10 ){ $("#feedback").html(inertia); $("#container").animate({ 'scrollLeft': $("#container").scrollLeft() + (inertia * 10) }, inertia * 20); }else{ $("#feedback").html("No Inertia"); } } I've bound it to the 'touchend' event on the body. The intertia is the difference betweent he old moveX position and the latest moveX position when a touch ends. I then try to animate the scrollLeft property of a div that contains a bunch of thumbnails. As I've said, this works when scrolling to the left, but not when scrolling to the right. You can view the full source code (all in one page) or test it on your iPhone or iPad (or in the simulator) here http://www.appliedworks.co.uk/files/times/swipegal.html Any ideas?

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• What's with the love of dynamic Languages

  - by Kibbee

  It seems that everybody is jumping on the dynamic, non-compiled bandwagon lately. I've mostly only worked in compiled, static typed languages (C, Java, .Net). The experience I have with dynamic languages is stuff like ASP (Vb Script), JavaScript, and PHP. Using these technologies has left a bad taste in my mouth when thinking about dynamic languages. Things that usually would have been caught by the compiler such as misspelled variable names and assigning an value of the wrong type to a variable don't occur until runtime. And even then, you may not notice an error, as it just creates a new variable, and assigns some default value. I've also never seen intellisense work well in a dynamic language, since, well, variables don't have any explicit type. What I want to know is, what people find so appealing about dynamic languages? What are the main advantages in terms of things that dynamic languages allow you to do that can't be done, or are difficult to do in compiled languages. It seems to me that we decided a long time ago, that things like uncompiled asp pages throwing runtime exceptions was a bad idea. Why is there is a resurgence of this type of code? And why does it seem to me at least, that Ruby on Rails doesn't really look like anything you couldn't have done with ASP 10 years ago?

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• No Commons Logging in Android?

  - by Joe Boese

  Hello all, I have a pretty big library I developed specifically for use in my Android Application. However business logic itself has no dependency on Android. To preserve that, I used Commons Logging throughout this library and it's respective JUnit tests (which I run in Eclipse). However now that I am starting to integrate it into an Activity which I launch on Android, I am unable to get my logging to work. In Eclipse/JUnit, I had simply pulled in log4j's jar file as well as a log4j.properties file. This doesn't seem to work when deploying to a device. After struggling with attempting to get that to work for several hours, I gave up and tried replacing all my commons logging stuff with android.util.Log. Now I can log on the device.. but all JUnit tests are broken. When any JUnit tries to log using android.util.Log, it throws a RuntimeException 'Stub!'. I would prefer to revert to my commons logging approach.. if anyone can help with that.. otherwise.. what can I do to get my JUnit test cases running using 'android.util.Log'? Many thanks in advance.. I've spent more than a few hours on this and I'd like to move on to writing real code again! Joe

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• Implementing the ‘defer’ statement from Go in Objective-C?

  - by zoul

  Hello! Today I read about the defer statement in the Go language: A defer statement pushes a function call onto a list. The list of saved calls is executed after the surrounding function returns. Defer is commonly used to simplify functions that perform various clean-up actions. I thought it would be fun to implement something like this in Objective-C. Do you have some idea how to do it? I thought about dispatch finalizers, autoreleased objects and C++ destructors. Autoreleased objects: @interface Defer : NSObject {} + (id) withCode: (dispatch_block_t) block; @end @implementation Defer - (void) dealloc { block(); [super dealloc]; } @end #define defer(__x) [Defer withCode:^{__x}] - (void) function { defer(NSLog(@"Done")); … } Autoreleased objects seem like the only solution that would last at least to the end of the function, as the other solutions would trigger when the current scope ends. On the other hand they could stay in the memory much longer, which would be asking for trouble. Dispatch finalizers were my first thought, because blocks live on the stack and therefore I could easily make something execute when the stack unrolls. But after a peek in the documentation it doesn’t look like I can attach a simple “destructor” function to a block, can I? C++ destructors are about the same thing, I would create a stack-based object with a block to be executed when the destructor runs. This would have the ugly disadvantage of turning the plain .m files into Objective-C++? I don’t really think about using this stuff in production, I’m just interested in various solutions. Can you come up with something working, without obvious disadvantages? Both scope-based and function-based solutions would be interesting.

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• php cli script hangs with no messages

  - by julio

  Hi-- I've written a PHP script that runs via SSH and nohup, meant to process records from a database and do stuff with them (eg. process some images, update some rows). It works fine with small loads, up to maybe 10k records. I have some larger datasets that process around 40k records (not a lot, I realize, but it adds up to a lot of work when each record requires the download and processing of up to 50 images). The larger datasets can take days to process. Sometimes I'll see in my debug logs memory errors, which are clear enough-- but sometimes the script just appears to "die" or go zombie on me. My tail of the debug log just stops, with no error messages, the tail of the nohup log ends with no error, and the process is still showing in a ps list, looking like this-- 26075 pts/0 S 745:01 /usr/bin/php ./import.php but no work is getting done. Can anyone give me some ideas on why a process would just quit? The obvious things (like a php script timeout and memory issues) are not a factor, as far as I can tell. Thanks for any tips PS-- this is hosted on a godaddy VDS (not my choice). I am sort of suspecting that godaddy has some kind of limits that might kick in on me despite what overrides I put in the code (such as set_time_limit(0);).

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• Having trouble with extension methods for byte arrays

  - by Dave

  I'm working with a device that sends back an image, and when I request an image, there is some undocumented information that comes before the image data. I was only able to realize this by looking through the binary data and identifying the image header information inside. I've been able to make everything work fine by writing a method that takes a byte[] and returns another byte[] with all of this preamble "stuff" removed. However, what I really want is an extension method so I can write image_buffer.RemoveUpToByteArray(new byte[] { 0x42, 0x4D }); instead of byte[] new_buffer = RemoveUpToByteArray( image_buffer, new byte[] { 0x42, 0x4D }); I first tried to write it like everywhere else I've seen online: public static class MyExtensionMethods { public static void RemoveUpToByteArray(this byte[] buffer, byte[] header) { ... } } but then I get an error complaining that there isn't an extension method where the first parameter is a System.Array. Weird, everyone else seems to do it this way, but okay: public static class MyExtensionMethods { public static void RemoveUpToByteArray(this Array buffer, byte[] header) { ... } } Great, that takes now, but still doesn't compile. It doesn't compile because Array is an abstract class and my existing code that gets called after calling RemoveUpToByteArray used to work on byte arrays. I could rewrite my subsequent code to work with Array, but I am curious -- what am I doing wrong that prevents me from just using byte[] as the first parameter in my extension method?

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• Vote on Pros and Cons of Java HTML to XML cleaners

  - by George Bailey

  I am looking to allow HTML emails (and other HTML uploads) without letting in scripts and stuff. I plan to have a white list of safe tags and attributes as well as a whitelist of CSS tags and value regexes (to prevent automatic return receipt). I asked a question: Parse a badly formatted XML document (like an HTML file) I found there are many many ways to do this. Some systems have built in sanitizers (which I don't care so much about). This page is a very nice listing page but I get kinda lost http://java-source.net/open-source/html-parsers It is very important that the parsers never throw an exception. There should always be best guess results to the parse/clean. It is also very important that the result is valid XML that can be traversed in Java. I posted some product information and said Community Wiki. Please post any other product suggestions you like and say Community Wiki so they can be voted on. Also any comments or wiki edits on what part of a certain product is better and what is not would be greatly appreciated. (for example,, speed vs accuracy..) It seems that we will go with either jsoup (seems more active and up to date) or TagSoup (compatible with JDK4 and been around awhile). A +1 for any of these products would be if they could convert all style sheets into inline style on the elements.

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• Compare new Integer Objects in ArrayList Question

  - by thechiman

  I am storing Integer objects representing an index of objects I want to track. Later in my code I want to check to see if a particular object's index corresponds to one of those Integers I stored earlier. I am doing this by creating an ArrayList and creating a new Integer from the index of a for loop: ArrayList<Integer> courseselectItems = new ArrayList(); //Find the course elements that are within a courseselect element and add their indicies to the ArrayList for(int i=0; i<numberElementsInNodeList; i++) { if (nodeList.item(i).getParentNode().getNodeName().equals("courseselect")) { courseselectItems.add(new Integer(i)); } } I then want to check later if the ArrayList contains a particular index: //Cycle through the namedNodeMap array to find each of the course codes for(int i=0; i<numberElementsInNodeList; i++) { if(!courseselectItems.contains(new Integer(i))) { //Do Stuff } } My question is, when I create a new Integer by using new Integer(i) will I be able to compare integers using ArrayList.contains()? That is to say, when I create a new object using new Integer(i), will that be the same as the previously created Integer object if the int value used to create them are the same? I hope I didn't make this too unclear. Thanks for the help!

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