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• multiplayer / visitors interactions with Ruby on Rails?

  - by Jordi

  I want to have interactions between visitors on my site. Imagine a chat room. It basically involves getting the data from everyone and sending it to everyone, this can be done by ajax and what not but I wonder if there is something already there in the wild that would do the heavy lifting for me. I have to say that I got very lost once I start programming Ajax, dont even know how to make tests for it... I have found the Q42multiplayer library that looks like what I want but they use C# as backend. There is something similar or any other multiplayer thingy I can get some idea or rip some code from (the whole thing will be opensource) for Ruby on Rails?

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• How to get users to read error messages?

  - by FX

  If you program for a nontechnical audience, you find yourself at a high risk that users will not read your carefully worded and enlightening error messages, but just click on the first button available with a shrug of frustration. So, I'm wondering what good practices you can recommend to help users actually read your error message, instead of simply waiving it aside. Ideas I can think of would fall along the lines of: Formatting of course help; maybe a simple, short message, with a "learn more" button that leads to the longer, more detailed error message Have all error messages link to some section of the user guide (somewhat difficult to achieve) Just don't issue error messages, simply refuse to perform the task (a somewhat "Apple" way of handling user input) Edit: the audience I have in mind is a rather broad user base that doesn't use the software too often and is not captive (i.e., not an in-house software or narrow community). A more generic form of this question was asked on slashdot, so you may want to check there for some of the answers.

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• Handling User Authentication in C#.NET?

  - by Daniel

  I am new to .NET, and don't have much experience in programming. What is the standard way of handling user authentication in .NET in the following situation? 1.In Process A, User inputs ID/Password 2.Process A sends the ID/Password to Process B over a nonsecure public channel. 3.Process B authenticates the user with the recieved ID/Password what are some of the standard cryptographic algorithms I can use in above model? The users(customers that bought my company's software) will be running the software(Process A) locally in their computer(connected to internet). I need to authenticate the users so that only registered users can run the program. Thank You!

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• Disable debug output in libxml2 and xmlsec

  - by ereOn

  Hi, In my software, I use libxml2 and xmlsec to manipulate (obviously) XML data structures. I mainly use XSD schema validation and so far, it works well. When the data structure input by the client doesn't match the XSD schema, libxml2 (or xmlsec) output some debug strings to the console. Here is an example: Entity: line 1: parser error : Start tag expected, '<' not found DUMMY<?xml ^ While those strings are useful for debugging purposes, I don't want them to appear and polute the console output in the released software. So far, I couldn't find an official way of doing this. Do you know how to suppress the debug output or (even better) to redirect it to a custom function ? Many thanks.

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• Check firebird databases present

  - by Ronaldo Junior

  Our software installer install firebird if it is not present on the system and, as we are pursuing Win certificate the uninstaller should remove it but, we want to make sure that even if it was the installer that put it there, if any new software is using it now with a new database, we would not remove it (Firebird). The question is: Is it possible to query the server and ask what are the databases running on it? This is it so that we can decide, automatically if we can remove the database or not. A few extra info: Our installer is Innosetup and it does a good job already - we just trying to make it smarter because of the "Developed by" or "Compatible with" windows logo.

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• HTML + CSS dynamic render in flash?

  - by Ole Jak

  I have HTML + CSS text. I need some lib with simple function like "Render String Var conteining HTML" So no external files (like in flash lib called HTMLwraper you just have to play your SWF on top of HTML). dinamic! I give it string it renders It into some conteiner (not as a bitmab but as if it was real HTML dynamically rendered in flash). (And I need real HTML + CSS support not what normal rich text block gives us) I am going to use it in with Flex (Flash Builder) so I like MXML component model but even pure flash AS3 will workout. It should be Free and Opensource (any license like GPL, LGPL etc will be ok). So Is out there such flash\flex library for HTML + CSS dynamic rendering (rfom given String or XML)?

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• How to create serial number generator?

  - by nir

  How can I program a Serial Number Generator that generates serial numbers for some existing software?

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• Installing Mapnik 2.2.0 in windows 7 with Python 2.7

  - by Joan Natalie

  I've been trying to install mapnik on my computer for hours but what i always get when I import mapnik is ImportError: DLL load failed: The specified procedure could not be found. I'm using Windows 7. The currently installed software is Geoserver from Opengeo suite. Here is my path %SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;C:\Program Files\WIDCOMM\Bluetooth Software\;C:\Program Files\Java\jre7\bin;C:\Program Files\Java\jdk1.7.0_45\bin;C:\Python27;C:\mapnik-v2.2.0\lib My python path: C:\Python27;C:\Python27\Lib;C:\Python27\DLLs;C:\Python27\Lib\lib-tk;C:\Program Files\ArcGIS\bin;C:\\mapnik-v2.2.0\python\2.7\site-packages\;C:\mapnik-v2.2.0\bin\;

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• Hibernate - hibernate.hbm2ddl.auto = validate

  - by azp74

  I am interested in how hibernate.hbm2ddl.auto=validate actually works and I am struggling to find comprehensive documentation. We've recently discovered production system was affected by http://opensource.atlassian.com/projects/hibernate/browse/HHH-3532 (Hibernate matches foreign keys on name, rather than signature and so will recreate them for you) and hibernate.hbm2ddl.auto=update is being removed from our next release. I would be quite happy to just get rid of hibernate.hbm2ddl.auto altogether and manage our database ourselves. However, not all my colleagues share this world view and some are keen to add back in hibernate.hbm2ddl.auto=validate. I'm concerned this will hit the same problem and I'm interested in finding more documentation about how this validation actually works. The Hibernate Community Documentation (http://docs.jboss.org/hibernate/core/3.3/reference/en/html/session-configuration.html) really just makes reference to the values. Does anyone have any good documentation pointers, or any real life experience of using validate in a production system?

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• Are there any famous one-man-army programmers?

  - by DFectuoso

  Lately I have been learning of more and more programmers who think that if they were working alone, they would be faster and would deliver more quality. Usually that feeling is attached to a feeling that they do the best programming in their team and at the end of the day the idea is quite plausible. If they ARE doing the best programming, and worked alone (and more maybe) the final result would be a better piece of software. I know this idea would only work if you where enough passionate to work 24/7, on a deadline, and great discipline. So after considering the idea and trying to learn a little more, I wonder if there are famous one-man-army programmers that have delivered any (useful) software in the past?

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• Best practices for managing limited client licenses/login

  - by MicSim

  I have a multi-user software solution (containing different applications, i.e. EXEs) that should allow only a limited number of concurrent users. It's designed to run in an intranet. I dont have a really good, satisfactory solution to the problem of counting the client licenses yet. The key requirements are: Multiple instances (starts) of the same application (= process) should count as only one client licence Starting different applications of the software solution should also count as only one (the same) client licence Application crash should not lead to orphaned used licences The above should work also for Terminal Server environments (all clients same IP, but different install folders) I'm looking for estabilished patterns, solutions, tips for managing used client licenses. Specific hints for the above sitaution are also welcome.

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• Testing harness for online teaching?

  - by candeira

  I have been asked to teach an online programming course, and I am looking for a test harness especially geared to education. Some students will have significant coding experience, but others will be total newbies. The course is an introduction to software development, mostly taught in C with some C++ and Java thrown in. In any case, I would like to read their source code only after a test suite has made sure that it compiles and executes properly. The students will also benefit from having a tool they can check their code against before submitting it. However, the Learning Management System my employer is using doesn't have such a system. Do you know of any LMS software that includes this feature? Which testing harness would you recommend in case I have to roll my own?

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• Stress Test tool for Password Protected Website

  - by Jason

  We need to run a stress test on a password protection section of a website we host. What tool (paid or free) would be best for us to use for this? We'd like to be able to create several 'scripts' and then have the stress test simulate X number of users. Each script will have us login as a specific user and then click on some links and submit forms to simulate an actual user. Ideally the software would also create some nice data exports/charts. Server is a linux web server, but we could run this on linux or Windows so software that will run on either is fine.

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• How can I reprogram a USB "easy button"?

  - by Shawn Simon

  I have a USB "easy button"- is a USB cable attached to a large button. It appears as a keyboard to the computer. When I push the button, it sends the keys Start+R and then quickly types in a pre-configured URL. I am fairly certain that the company that produces these buttons sets the URL via some sort of software over USB. How could I reprogram the button myself? What sort of software would I need? Here is a link to the website: http://www.usbsmartbuttons.com/

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• Nunit test project won't compile under mono

  - by Quandary

  Question: I am implementing an OpenSource version of Microbosoft Sync framework, [http://www.microsoft.com/downloads/d...isplaylang=en] (Checkout: git clone [email protected]:quandary/SyncFramework.git) but I ran into a unittest problem. I added a nunit test-project to the C# project, but it's not compiling... I created the project on Windows, and there it compiled well. On Linux, the project compiles well, but compiling the unittest, I always get: Assembly 'nunit.framework, Version=2.5.5.10112, Culture=neutral, PublicKeyToken=96d09 My problem now is I installed nunit and added a reference to it (on Linux with mono), but I still get this message, I take out 'require specific version', and I still get this message... I also removed the windows reference to nunit, but still no change.

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• Do you know any alternative to NDepend for architects?

  - by ifesdjeen

  Hi! do you know any software similar to NDepend? I've got it just recently, and found it very useful. It helped me a lot, but for now i don't have a possibility to buy a proffessional version. So, is there any alternative (maybe, open-source)? Preferrably, free. But not necessarily. Maybe, with a little bit more fitting price for a single-developer, not a team. Requirements for this software: Build dependency diagrams Retrieve code metrics Display comments coverage (so far)

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• WAN Optimization Resources

  - by Paul

  I'm looking for resources on writing software to do WAN optimization. I've googled this and searched SO, but there doesn't seem to be much around. The only things I've found are high-level articles in tech magazines, and info for network admins on how to make use of existing WAN optimization products. I'm looking for something on the techniques etc. used to write WAN optimization software. It seems to be a dark art, and the people who know how to do it, guard their secrets closely. Any suggestions?

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• .NET StandardInput Sending Modifiers

  - by Paul Oakham

  We have some legacy software which depends on sending keystrokes to a DOS window and then scraping the screen. I am trying to re-create the software by redirecting the input and output streams of the process directly to my application. This part I have managed fine using: _Process = new Process(); { _Process.StartInfo.FileName = APPLICATION; _Process.StartInfo.RedirectStandardOutput = true; _Process.StartInfo.RedirectStandardInput = true; _Process.StartInfo.RedirectStandardError = true; _Process.StartInfo.UseShellExecute = false; _Process.StartInfo.CreateNoWindow = true; _Process.OutputDataReceived += new DataReceivedEventHandler(_Process_OutputDataReceived); _Process.ErrorDataReceived += new DataReceivedEventHandler(_Process_ErrorDataReceived); } My problem is I need to send some command modifiers such as Ctrl, ALT and Space as well as F1-12 to this process but am unsure how. I can send basic text and I receive response's fine. I just need to emulate these modifiers.

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• How to write a linter?

  - by jbdavid

  In my day job I, and others on my team write a lot of hardware models in Verilog-AMS, a language supported primarily by commercial vendors and a few opensource simulator projects. One thing that would make supporting each others code more helpful would be a LINTER that would check our code for common problems and assist with enforcing a shared code formatting style. I of course want to be able to add my own rules and, after I prove their utility to myself, promote them to the rest of the team.. I don't mind doing the work that has to be done, but of course also want to leverage the work of other existing projects. Does having the allowed language syntax in a yacc or bison format give me a leg up? or should I just suck each language statement into a perl string, and use pattern matching to find the things I don't like? (most syntax and compilation errors are easily caught by the commercial tools.. but we have some of our own extentions.)

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• Subclipse plugin doesn't work in Eclipse?

  - by blackicecube

  Hi, even though there was no error when installing Subclipse in Eclipse. I won't see the SVN perspective at all? I have tried with "Eclipse Classic 3.5.1" and with "Eclipse for PHP Developers". After downloading and unzipping the packages I used Eclipse's "Install Software" mechanism to install Subclipse 1.6.x. I followed the steps described here: http://www3.math.tu-berlin.de/jreality/mediawiki/index.php/Subclipse_installation_in_eclipse_galileo. But after Eclipse re-starts I don't get any SVN Repository perspective? I have tried to un-install/re-install all the software components many times now. Finally after 3 hours of trying I am giving up. Does anyone have any hint what I am missing? Thanks! Peter

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• How to find connected hosts at network (vpn or lan)

  - by Javier Novoa C.

  Hello, I'm looking for possible solutions to the following need: I have a VPN configured (using openVPN over Linux, BTW), and I want to know at any moment which hosts are connected to it. I recognize that it probably is the same thing as trying to know which hosts are connected to a lan, so any of the solutions might do the job... The fact is that I once used a hamachi vpn on linux and with it I had the chance to know which hosts were connected to a particular network where I belonged, so I was wondering if something similar might be possible in openVPN (or even any VPN and/or any LAN). Preferably, I'm looking for opensource/free sw solutions, or maybe the hints to program it myself (in the most simple way if possible, not that I don't know how to program, but I'm trying to achieve this in a simple manner). But anyway, if there are no os/fsw solutions, any other one might do... Thanks a lot! Javier, Mexico city

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• XNA, WPF light show visualizer

  - by Bgnt44

  HI all, I'm developing a software to control light show ( through DMX protocol ), i use C# and wpf to develop my main software (.net 4.0) To help people preview their show, i would like to make a live 3D visualizer... First, i thought that i could use wpf 3D to make the visualizer, but i need to work with light .. My main application should send property ( beam angle, orientation (X,Y), position(X,Y), Brush ( color,shape,effect)) to the 3D visualizer But i would like to be able to move light (position in the scene) by mouse during execution and had value in return... So .. Does XNA is the easiest way to doing that ? Can you help me for that : Generating light (orientation , bitmap like filter in front of light ) Dynamically moving object with mouse and get position in return Dynamically add or remove fixture All of your advice, sample, example are very welcome ... I don't espect to have a perfect result at the first time but i need to understand the main concepts for doing that Thank You !!

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• Openfire scalability question XMPP Server

  - by candoyo

  Hello! Do you guys know how well openfire scales? My users will be using the application to do normal chatting like msn no file transfer for now. We will be using Amazon's EC2 server to run the chat server we would like to support over 1 Million users in total and around 30-50K active users during peak times. Since clustering is now opensource, I though Openfire might be the way to go, how much will it cost for the coherence license or can I bipass that somehow? Also, I wanted to develop plugin for Openfire if we go with it. Any pointers on how to set up a dev env and get going would be helpful too! Thanks ya'all! :)

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• WMI: Editing the Registry Remotely

  - by Quanta

  I'm trying to use the following code (poorly written, but it's just a proof of concept) to edit the registry of a computer on a domain. I have a domain account, and I've verified that the domain admin group is present in the local admin group on the machines I'm attempting to affect. I've connected to these other machines to perform other administrative type tasks, so I'm sure that I have administrative privileges on these hosts. All of StdRegProv's "get" methods work fine (http://msdn.microsoft.com/en-us/library/aa393664%28VS.85%29.aspx) but the "set" or "create" methods as well as check access all return "5" which is "Error_Access_Denied" according to winerror.h. So there's the problem: why do I get access denied when attempting to modify the registry? If anyone can help me figure this out, you'd have my utmost appreciation! I almost forgot, when I fire up Visual Studio in admin mode on my local machine and run the code against the local machine, it works flawlessly. If I don't start in admin mode on the local machine, the code fails, so I suspect there's a UAC problem maybe? using System; using System.Management; public class EditRemoteRegistry { public static void Main(string[] args) { ConnectionOptions options = new ConnectionOptions(); options.EnablePrivileges = true; options.Impersonation = ImpersonationLevel.Impersonate; options.Password = "password goes here"; //options.Authority = "my company's domain"; //options.Username = "Admin username"; ManagementScope scope = new ManagementScope("\\\\arbitraryhost\\root\\default", options); scope.Connect(); ManagementClass mc = new ManagementClass("StdRegProv"); ManagementBaseObject inParams = mc.GetMethodParameters("CreateKey"); inParams["hDefKey"] = (UInt32)2147483650; inParams["sSubKeyName"] = "Software\\Test"; ManagementBaseObject outParams = mc.InvokeMethod("CreateKey", inParams, null); //Should return a 0, but returns a 5, "Error_Access_Denied" Console.WriteLine("CreateKey Method returned " + outParams["returnValue"]); //This chunk works fine ManagementBaseObject inParams5 = mc.GetMethodParameters("GetDWORDValue"); inParams5["hDefKey"] = 2147483650; inParams5["sSubKeyName"] = "Software\\Test"; inParams5["sValueName"] = "testDWORDvalue"; ManagementBaseObject outParams5 = mc.InvokeMethod("GetDWORDValue", inParams5, null); Console.WriteLine("GetDWORDValue returned " + (UInt32)outParams5["returnValue"] + " "); Console.WriteLine((UInt32)outParams5["uValue"]); ManagementBaseObject inParams6 = mc.GetMethodParameters("SetStringValue"); inParams6["hDefKey"] = 2147483650; inParams6["sSubKeyName"] = "Software\\Test"; inParams6["sValueName"] = "TestStringValue"; inParams6["sValue"] = "Hello World!"; ManagementBaseObject outParams6 = mc.InvokeMethod("SetStringValue", inParams6, null); //Should return a 0, but returns a 5, "Error_Access_Denied" Console.WriteLine("SetStringValue returned " + outParams6["returnValue"]); Console.ReadKey(); } }

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• Tools to create maximum velocity in a .NET dev team

  - by Søren Spelling Lund

  If you were to self-fund a software project which tools, frameworks, components would you employ to ensure maximum productivity for the dev team and that the "real" problem is being worked on. What I'm looking for are low friction tools which get the job done with a minimum of fuss. Tools I'd characterize as such are SVN/TortioseSVN, ReSharper, VS itself. I'm looking for frameworks which solve the problems inherient in all software projects like ORM, logging, UI frameworks/components. An example on the UI side would be ASP.NET MVC vs WebForms vs MonoRail.

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