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• How do I maintain scroll position in MVC?

  - by Eric Brown

  Im working on a project in MVC and have enjoyed learning about it. There are a few growing pains but once you figure them out it's not bad. One thing that is really simple in the WebForms world is maintaining the scroll position on a page. All you do is set the MaintainScrollPositionOnPostback property to true. However, in MVC, Im not using postbacks so this will not work for me. What is the standard way of handling this? Edit: Ajax is acceptable, but I was also wondering how you would do it without AJAX.

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• Permission denied - /tmp/.ruby_inline/Inline_ImageScience_cdab.c

  - by Ikaros

  I have a Ruby on Rails app that I've recently deployed to a remote server (Ubuntu 9.10, nginx, passenger, ruby-enterprise) and I'm getting the error (works fine locally): Permission denied - /var/www/project_name/tmp/.ruby_inline/Inline_ImageScience_cdab.c First, the folder /tmp/.ruby_inline/ is empty - should it be? Is it trying to create Inline_ImageScience_cdab.c or read it? I think I have all the required gems installed: 'gem list' shows image_science and RubyInline installed. libfreeimage3 and libfreeimage-dev are also installed. I've run chmod 755 on /tmp/.ruby_inline/ to match the permissions on surrounding folders but I cannot go any higher than that, however, or I get another error: /var/www/project_name/tmp/.ruby_inline is insecure (40777). It may not be group or world writable. Exiting. And I guess second, why am I getting this error? :) Thanks

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• From interpeted to native code: "dynamic" languages compiler support

  - by Daniel

  First, I am aware that dynamic languages is a term used mainly by a vendor; I am using it just to have a container word to include languages like Perl (a favorite of mine), Python, Tcl, Ruby, PHP and so on. They are interpreted but I am interested here to refer to languages featuring strong capability to support the programmer efficiency and the support for typical constructs of modern interpreted languages My question is: there are dynamic languages can be compiled efficiently in native executable code - typically for Windows platforms? Which ones? Maybe using some third part ad-hoc tools? I am not talking about huge executables carrying with them a full interpreter or some similar tricks nor some smart module able to include its own dependances or some required modules, but a honest, straight, standard, solid executable code. If not, there is some technical reason inhibiting the availability of such a best-of-both-world feature? Thanks! Daniel

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• Convert wife/husband/partner to a programmer.

  - by Stefan

  originally posted by Stefan: How many of you have had the thought of educate your partner and invite him/her to the beautiful world of programming? I once started to give my wife lessons twice a week, It was a competition between me and another programmer, we thought it would be nice to have our wives understand why we work as programmers and also have it as a hobby sitting all night long. Maybe we could get our wives to feel the power too? After a couple of months my wife didn't like the idea any more, it was too hard to understand she thought, same for my friends wife. So now we are thinking of some project that would be too fun for our wives to turn down just to get the spirit up again. It would be nice to hand over a project to my wife, "Can you debug this for me, please? There are some strange error on module xxx." :) Maybe I'm crazy, what do you think?

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• Converting kernel image from ELF to PE

  - by Frank Miller

  I am using Msys to build a home brew kernel that I wrote under Linux. Linux used ELF for its binary format and Msys uses PE. I have the source setup to allow it to be booted by Grub using the Multiboot spec. At the end of the build, I get some undefined symbols: init.o:init.S:(.text+0x14): undefined reference to `edata' main.o:main.c:(.text+0x121): undefined reference to `_alloca' main.o:main.c:(.text+0x126): undefined reference to `__main' ../../lib\libkern.a(mem.o):mem.c:(.text+0x242): undefined reference to `_end' ../../lib\libkern.a(mem.o):mem.c:(.text+0x323): undefined reference to `_end' These appear to be ELF oriented symbols. If anyone can advise me on how these should be dealt with in the PE world, e.g. if there are equivalents, it would help me out a lot!

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• Caesar Cipher in Java (Spanish Characters)

  - by Rodolfo

  I've reading this question, and I was wondering if Is there any way to consider the whole range of characters? For example, "á", "é", "ö", "ñ", and not consider " " (the [Space])? (For example, my String is "Hello World", and the standard result is "Khoor#Zruog"; I want to erase that "#", so the result would be "KhoorZruog") I'm sure my answer is in this piece of code: if (c >= 32 && c <= 127) { // Change base to make life easier, and use an // int explicitly to avoid worrying... cast later int x = c - 32; x = (x + shift) % 96; chars[i] = (char) (x + 32); } But I've tried some things, and it didn't work.

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• The type or namespace name 'DefaultTemplateLexer' could not be found

  - by user310291

  The official tutorial from http://www.antlr.org/wiki/display/ST/Five+minute+Introduction doesn't work because of DefaultTemplateLexer, how to fix ? using System; using Antlr.StringTemplate; class Script { static public void Main(string[] args) { StringTemplateGroup group = new StringTemplateGroup("myGroup", @"C:\Tutorials\stringtemplate", typeof(DefaultTemplateLexer)); StringTemplate helloAgain = group.GetInstanceOf("homepage"); helloAgain.SetAttribute("title", "Welcome To StringTemplate"); helloAgain.SetAttribute("name", "World"); helloAgain.SetAttribute("friends", "Terence"); helloAgain.SetAttribute("friends", "Kunle"); helloAgain.SetAttribute("friends", "Micheal"); helloAgain.SetAttribute("friends", "Marq"); Console.Out.WriteLine(helloAgain.ToString()); } }

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• Is any simple way to create method and set its body dynamically in C#?

  - by greatromul

  I hold body of method in string. I want to create method dynamically. But I don't know, how to set its body. I saw very tedious way using CodeDom. And I saw using Emit with OpCodes. Is any way to use ready code from string variable? string method_body = "return \"Hello, world!\";"; //there is method body DynamicMethod dm = new System.Reflection.Emit.DynamicMethod("My_method", typeof(string), new Type[] { }); //any way to create method dynamically //any way to set body string result = (string)dm.Invoke(...); //I need write result in variable

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• jQuery Toggle Cookie Support

  - by hell0w0rld

  I'm trying to implement the jQuery Cookie plugin into my slide toggle script, but so far haven't been successful. Here's my code (without any cookie implementation): jQuery: $(document).ready(function() { $('a.toggle').click(function() { var id = $(this).attr('name'); $('#module' + id).slideToggle('fast'); $('a.toggle[name='+id+']').toggle(); return false; }); }); HTML: <a class="toggle" name="1" href="#">- Hide</a> <a class="toggle hidden" name="1" href="#">+ Show</a> <div id="module1"><p>Hello World</p></div> Anyone know if it's easy enough to implement the jQuery Cookie plugin into my existing code so it remembers the open/closed state? Thank you.

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• Server-initiated Rendering: EJB -> FacesContext?

  - by egbokul

  I've already asked this question on the Icefaces forum, but meanwhile I realized that this is a more generic problem. I'd like to update parts of a JSF page when I get a message in my MDB. The problem is, how do I get the FacesContext from the EJB container? In the message processing function FacesContext.getCurrentInstance() returns null. I've also tried to make a JSF managed bean be a MDB, but I couldn't (it seems you can't have both in the same class?). Since I'm a beginner in the JSF world I'm kind of stuck now. Is there a way to make it work? (Glassfish v3 + Netbeans 6.8, JSF2 + Icefaces 2.0 alpha2)

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• asp.net application install folder

  - by Maximilian Csuk

  Disclaimer: this is not a question about how to install asp.net or an application using it! Hi! I am pretty sure many of you have once installed some kind of forum, blog or CMS (mostly PHP powered applications). All of these contain a folder mostly named "install" where (after you copied the files to the webserver) point your browser to to complete the installation by entering for example database information (servername, username, password, ...). After that, most applications suggest that you delete this folder or at least change the permissions so nobody from the outside can access it anymore. Now to my question: how would you go about that in the asp.net world? I don't really like the "install folder"-approach and I thought there might be a different mechanism for .net/IIS. The person installing my application should be able to enter his database information as painless as possible, which should ultimatively be stored in the web.config file. If it makes a difference, I am using asp.net MVC. Thanks for your help!

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• SciPy interp1d results are different than MatLab interp1

  - by LMO

  I'm converting a MatLab program to Python, and I'm having problems understanding why scipy.interpolate.interp1d is giving different results than MatLab interp1. In MatLab the usage is slightly different: yi = interp1(x,Y,xi,'cubic') SciPy: f = interp1d(x,Y,kind='cubic') yi = f(xi) For a trivial example the results are the same: MatLab: interp1([0 1 2 3 4], [0 1 2 3 4],[1.5 2.5 3.5],'cubic') 1.5000 2.5000 3.5000 Python: interp1d([1,2,3,4],[1,2,3,4],kind='cubic')([1.5,2.5,3.5]) array([ 1.5, 2.5, 3.5]) But for a real-world example they are not the same: x = 0.0000e+000 2.1333e+001 3.2000e+001 1.6000e+004 2.1333e+004 2.3994e+004 Y = -6 -6 20 20 -6 -6 xi = 0.00000 11.72161 23.44322 35.16484... (2048 data points) Matlab: -6.0000e+000 -1.2330e+001 -3.7384e+000 ... 7.0235e+000 7.0028e+000 6.9821e+000 SciPy: array([[ -6.00000000e+00], [ -1.56304101e+01], [ -2.04908267e+00], ..., [ 1.64475576e+05], [ 8.28360759e+04], [ -5.99999999e+00]]) Any thoughts as to how to can get results that are consistent with MatLab?

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• Increasing speed of webservice - howto

  - by Koran

  Hi, Our client-server product has the protocol between them as XML over HTTP. Here, the client asks a GET/POST query to the web server and the server responds with XML. The server is written using django. The server has to be on the web because there are many clients across the world using this. The server code uses extensive memoization and also there is very less db queries - most queries dont have any db queries, some of them has max 1. The biggest problem is the speed. Every query takes close to 5 seconds for the reply. The data replied is also very less - in the range of 4-6 Kb. What are the mechanisms to improve speed of the web service? Is this the usual way of writing a client-server? Are there other technologies and are we missing out on it? Thank you K

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• How do I change careers to become a programmer with little money

  - by bgc83

  I'm currently a network engineer, but find myself wanting to get into the world of development. I took a little bit of Java in college, am 27 years old and have been network engineering for 4 years now. I have a mortgage and student loans so going back to school would be difficult. I'm willing to put in however much hardwork is needed around my full time job to learn, but part of me feels I may need actuall schooling to get down some of the advanced concepts. Just looking for a little advice and direction. I have purchased a bunch of the Head First programming books and have begun reading through some of them as I figure out my way into this transition.

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• Load Balancing and Failover for Read-Only PostgreSQL Database

  - by Eric J.

  Scenario Multiple application servers host web services written in Java, running in SpringSource dm Server. To implement a new requirement, they will need to query a read-only PostgreSQL database. Issue To support redundancy, at least two PostgreSQL instances will be running. Access to PostgreSQL must be load balanced and must auto-fail over to currently running instances if an instance should go down. Auto-discovery of newly running instances is desirable but not required. Research I have reviewed the official PostgreSQL documentation on this issue. However, that focuses on the more general case of read/write access to the database. Top google results tend to lead to older newsgroup messages or dead projects such as Sequoia or DB Balancer, as well as one active project PG Pool II Question What are your real-world experiences with PG Pool II? What other simple and reliable alternatives are available?

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• Blackberry Application not deploying in simulator from eclipse

  - by Joe

  I wrote a first sample Hello World Program for BB in eclipse using the plugin and everything worked fine. But then I wrote another app, not much different from the first and I went to deploy it and the simulator opened but only the first application was there. I tried loading the .cod file from inside the simulator but that didn't work either. I also tried exiting and resetting the simulator and using the clean.bat file but none of that worked either. Finally I tried to load another sample program I downloaded from RIM and that worked just fine. Help! I'm completely stuck.

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• What should I grab as a development platform, an iPod or an iPad?

  - by mmr

  Hey all, I've recently gotten into the world of contract programming, and two of my clients have indicated that they'd like to do something 'trendy', like ipod touch/iphone/ipad development. I have a mac laptop (first gen macbook pro) that I'll have to upgrade to snow leopard to do the development for any of them, from what I've read. So that's already a bit of a commitment, given all the stuff I have on that laptop I'll have to make sure is recoverable from backup. My budget is limited, but I think I need to learn this skill. Which device should I get to learn this kind of development, an iPod touch or an iPad? I don't have the money for an iPhone. I think that the iPhone/iPad SDK has an emulator mode, but I like to have the device I'm going to roll out on available to make sure that everything works as I'd expect, ie, what's easily readable on a laptop screen is still readable on the touch, etc.

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• Analysis and Design for Functional Programming

  - by edalorzo

  How do you deal with analysis and design phases when you plan to develop a system using a functional programming language like Haskell? My background is in imperative/object-oriented programming languages, and therefore, I am used to use case analysis and the use of UML to document the design of program. But the thing is that UML is inherently related to the object-oriented way of doing software. And I am intrigued about what would be the best way to develop documentation and define software designs for a system that is going to be developed using functional programming. Would you still use use case analysis or perhaps structured analysis and design instead? How do software architects define the high-level design of the system so that developers follow it? What do you show to you clients or to new developers when you are supposed to present a design of the solution? How do you document a picture of the whole thing without having first to write it all? Is there anything comparable to UML in the functional world?

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• Finding an open and closing tag in Regexp

  - by Rixius

  Is there a way to find custom tags in regexp I.e. match {a}sometext{/a} As well as {c=#fff}sometext{/c} So that it finds the entire block of inner content? The problem is the sometext could have another tag as in: {a=http://www.google.com}{b}Hello, world{/b}{/a} The only solutions I can come up with would match from {a... to .../b} when I want {a... to .../a} is there a single regexp solution, or would it be best to match the start, and then use another method to find the end from the back up, and grab it out that way? I'm using PHP 5.2 so I have all the options that entails.

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• Shall i learn Assembly Language or C, to Understand how "real programming" works?

  - by Daniel Upton

  Hello, World.. I'm a web developer mostly working in Ruby and C#.. I wanna learn a low level language so i dont look like an ass infront of my (computer science expert) boss. Ive heard a lot of purist buzz about how assembly language is the only way to learn how computers actually work, but on the other hand C would probably be more useful as a language rather than just for theory. So my question is.. Would Learning C teach me enough computer science theory / low level programming to not look like a common dandy (complete tool)? Thanks! Daniel

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• Naming convention in Objective C /C , start with "_"?

  - by Tattat

  Something I see ppl define the variable like this: b2World *_world; b2Body *_body; CCSprite *_ball; instead of b2World *world; b2Body *body; CCSprite *ball; I familiar with the second one, but not the first one. So, I checked the Wikipedia about naming convention: Names beginning with double underscore or an underscore and a capital letter are reserved for implementation (compiler, standard library) and should not be used (e.g. __reserved or _Reserved). So, is that any special meaning which is start with "_"? The wiki page.

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• Moderating computer-addiction through programming

  - by every_answer_gets_a_point

  i have an addiction to be on the computer all the time. it doesn't matter what i am doing as long as i am in front of it. i feel like the whole world is here and this is all that matters. i found that through some intellectual stimulation, like writing algorithms, it has helped me to be more satisfied with the time on the computer and i dont need it as much. if any of you have had experience with reliving your computer anxiety through writing code, can you tell me exactly what you wrote, and what you may recommend i work on? thank you for your programming advice

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• Metro + Jetty + OSGi = pain

  - by mjgp2

  I am trying to swap out Sun's HTTPServer for the much better Jetty server, within an OSGi bundle, running on Equinox. I have tried this: System.setProperty("com.sun.net.httpserver.HttpServerProvider","org.mortbay.jetty.j2se6.JettyHttpServerProvider"); but when endpoint.publish(url) is called, and the server is spawned, it complains of a ClassNotFoundException for org.mortbay.jetty.j2se6.JettyHttpServerProvider. However, the correct jars are in the bundle, and indeed in the Activator I can instantiate a org.mortbay.jetty.j2se6.JettyHttpServerProvider. I think that this is a some kind of classpath issue - the spawned server is in a different classpath maybe? I have tried adding the JARs in at the JDK level, but this doesn't make any difference. Can oanyone shed any light how on earth to get this working? P.S. Maybe hideous System.setProperty calls will vanish from the world one day. Hopefully :)

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• What is your favorite convention for organizing a ASP.NET project?

  - by Michael Rosario

  Hello world. My team is starting a brand new ASP.NET solution which will probably become large. Inspired by ASP.NET MVC, we currently express all data access objects in a model project. We, however, do not have good conventions for organizing ASP.NET ascx's and aspx's. We have already reviewed DotNetNuke and want to avoid the complexity of driving the whole application through a single default.aspx . What is the best way to organize a non-MVC ASP.NET solution? Your tips, links, and advice are greatly appreciated!

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• How to reduce java concurrent mode failure and excessive gc

  - by jimx

  In Java, the concurrent mode failure means that the concurrent collector failed to free up enough memory space form tenured and permanent gen and has to give up and let the full stop-the-world gc kicks in. The end result could be very expensive. I understand this concept but never had a good comprehensive understanding of A) what could cause a concurrent mode failure and B) what's the solution?. This sort of unclearness leads me to write/debug code without much of hints in mind and often has to shop around those performance flags from Foo to Bar without particular reasons, just have to try. I'd like to learn from developers here how your experience is. If you had previous encountered such performance issue, what was the cause and how you addressed it? If you have coding recommendations, please don't be too general. Thanks!

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