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• Difference between Cloud and Virtualization

  - by Akash Kava

  Ops: This does not belong to ServerFault because it focuses on Programing Architecture. I have following questions regarding differences between Cloud and Virtualization.. How Cloud is different then Virtualization? Currently I tried to find out pricing of Rackspace, Amazone and all similar cloud providers, I found that our current 6 dedicated servers came cheaper then their pricing. So how one can claim cloud is cheaper? Is it cheaper only in comparison of normal hosting? We re organized our infrastructure in virtual environment to reduce or configuration overhead at time of failure, we did not have to rewrite any peice of code that is already written for earlier setup. So moving to virtualization does not require any re programming. But cloud is absoltely different and it will require entire reprogramming right? Is it really worth to recode when our current IT costs are 3-4 times lower then cloud hosting including raid backups and all sort of clustering for high availability? New programming architecture means new overheads of training staff, new methods of testing and new deployment schemes, does it justify over "on demand resource usage" words of cloud? We are having current development architecture with simple Server side ASP.NET WebServices with no local context and on client side Flex/Silverlight which offers pretty good REST architecture and its highly scalable. How does cloud differs from REST model of deployment? On storage, SQL Server or MySQL offers pretty good replication and high availibility then what is advantage in cloud? Data guarantee, one of our vendor hosting some other customer's app on cloud (one of most used), lost Entire Hard Disk (the virtual) and entire module in first 6 months. Second provider said its your duty to take backup, fine I agree, but no provider gives SLA for data guarantee, they give 99% uptime. However in most business apps, uptime is less important then data integrity. In our 10 years of dedicated hosting experience we had only one hard disk crash. This makes me little skeptical to go for cloud and loosing control over data. And I feel its just a big marketing buzz to sell virtulization in different form. Size of data, currently all providers charge very heavy for large data, if you are hosting only below 100GB cloud can be good alternative, but I think virtual servers and dedicated servers above 100GB to few TBs are still cheaper. Why would want to pay so high on cloud when there is no data guarentee as well as it doesnt say anything about redundancy. (I wish SO had something for spell check for Internet Explorer, sorry for wrong spellings in my post)

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• How to explain CSS Float in general language?

  - by metal-gear-solid

  How to explain CSS Float in general language (not Programming) ? Is there any real life example to take a example to explain CSS Float? Is there any Slideshow in very simple way to explain float?

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• Refactoring Singleton Overuse

  - by drharris

  Today I had an epiphany, and it was that I was doing everything wrong. Some history: I inherited a C# application, which was really just a collection of static methods, a completely procedural mess of C# code. I refactored this the best I knew at the time, bringing in lots of post-college OOP knowledge. To make a long story short, many of the entities in code have turned out to be Singletons. Today I realized I needed 3 new classes, which would each follow the same Singleton pattern to match the rest of the software. If I keep tumbling down this slippery slope, eventually every class in my application will be Singleton, which will really be no logically different from the original group of static methods. I need help on rethinking this. I know about Dependency Injection, and that would generally be the strategy to use in breaking the Singleton curse. However, I have a few specific questions related to this refactoring, and all about best practices for doing so. How acceptable is the use of static variables to encapsulate configuration information? I have a brain block on using static, and I think it is due to an early OO class in college where the professor said static was bad. But, should I have to reconfigure the class every time I access it? When accessing hardware, is it ok to leave a static pointer to the addresses and variables needed, or should I continually perform Open() and Close() operations? Right now I have a single method acting as the controller. Specifically, I continually poll several external instruments (via hardware drivers) for data. Should this type of controller be the way to go, or should I spawn separate threads for each instrument at the program's startup? If the latter, how do I make this object oriented? Should I create classes called InstrumentAListener and InstrumentBListener? Or is there some standard way to approach this? Is there a better way to do global configuration? Right now I simply have Configuration.Instance.Foo sprinkled liberally throughout the code. Almost every class uses it, so perhaps keeping it as a Singleton makes sense. Any thoughts? A lot of my classes are things like SerialPortWriter or DataFileWriter, which must sit around waiting for this data to stream in. Since they are active the entire time, how should I arrange these in order to listen for the events generated when data comes in? Any other resources, books, or comments about how to get away from Singletons and other pattern overuse would be helpful.

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• Where can I find a web-project "security checklist?"

  - by iaagty

  I'm looking for a complete list of security guidelines for programming and deploying PHP web sites and applications on an Apache (Linux) server. Basically, a "security check list" to run through before finishing a project. I.e., Cross Site Scripting Cross Site Request Forgery Sanitize form data that goes into database Disable register globals and error reporting in custom php.ini Upload files below web root ...(the list goes on) I did some searching on the internet and in this forum, but couldn't find a comprehensive, succinct, and complete list of guidelines. Thanks in advance.

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• Fit page(and its content) size in silverlight

  - by Meysam Javadi

  i have a page that have some control on it. i add some element with programming in code behind. how can i this: when i add control that is larger than its container, show Scroll?(i used ScrollViewr but i don't know size of container because it resize in Run-Time to fill Browser)

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• Has anyone had trouble with Intellisense in Visual Studio when using UltraVNC?

  - by mullala

  Hi, a colleague and I are trying pair programming for the first time. We both remote into a development machine; I'm using RemoteDesktop and my colleague is using UltraVNC. This works great except that he can't see the Intellisense dropdown in Visual Studio 2008. According to online posts, this may be something to do with DirectDraw, but I don't see much by way of a workaround. Has anyone else experienced this? Thanks, Andrew

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• Is it common practice to put keywords in html markup for SEO?

  - by Joel

  Though it's on the edge of programming questions, I think this is still relevant here, as only those of us actually doing the coding for a site would be considering this. I've been reading more about keyword placement, and it seems to me like a good place to do keyword placement would be in the class and id names chosen for the elements they are representing. I'm not talking about any kind of black-hat keyword stuffing thing but real legitimate use of descriptive keywords for elements. Is this something that is actively done for SEO?

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• iPage.com affilates get $115 for a $36 dollar sale ???

  - by user296516

  Hi, I understand that it's not a programming question, but still maybe someone here knows how comes that www.ipage.com is offering $115.00 to affiliates for every new customer ( that would buy, say, a $36 hosting plan ) ? Where's the catch?

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• set backlight time

  - by mk39

  Hi, Is there any way to change backlight turn off TIME using programming(Preferred c# or vb.net other c++ can be used too)? I guess, may be it is changed using registry info or API. Manually, it is done by: Setting Backlight (Battery Power and External Power) Thank you

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• What did you develop using a microcontroller?

  - by DR

  I've always been fascinated by microcontrollers and I'm planning to do a few hobby projects just to satisfy my inner geek :) I'm looking for ideas and motivation, so what did you develop using a microcontroller? If possible please state the microcontroller and/or development environment and an estimate on hardware costs beyond the basic equipment (if applicable). I'm interested in both successful and failed projects and any problems you encountered.

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• Evaluating and graphing functions in Matlab

  - by thiol3

  New to programming, I am trying to graph the following Gaussian function in Matlab (should graph in 3 dimensions) but am making some mistakes somewhere. What is wrong? sigma = 1 for i = 1:20 for j = 1:20 z(i,j) = (1/(2*pi*sigma^2))*exp(-(i^2+j^2)/(2*sigma^2)); end end surf(z)

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• Sharepoint Workflow task with title (external participant)

  - by Mina Samy

  Hi all I made a custom sharepoint workflow with Visual studio, the workflow starts when a new item is inserted in a list I assigned the title of the task to reference a field in the new item TaskProps.Title = "Please prepare Hardware for project " + workflowProperties.Item["Contract"].ToString().Split('#')[1]; the task title is correct but i find the string (exteranl participant) concatenated the title of the task what can be the reason for this ? thanks

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• GDI+ Resize Function

  - by Tyler

  So my logic is flawed and I need a better and correct way to resize an image in my c# app I need a function similar to this setup public void ResizeImageForWeb(string OriginalFile, string NewFile, int MaxWidth, int MaxHeight, int Quality) { // Resize Code } Basically, I'm a web designer lost trying to programming a desktop app.

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• About using OpenCV library in Java.

  - by Chetan

  Hi i am using Ubuntu linux, I have installed OpenCV library. How to use OpenCV library in Java programming?

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• Changing keyboard layout on application focus

  - by Anonymous Coward

  Hi Everyone As everybody knows the en-US Keyboard-layout is the best one for programming. So I'd like to use it in my IDEs. But since I live in a non-en-US country I need the de-CH layout for all other applications. Now I wonder if it is possible to set the layout depending to which application currently has the focus. If that is possible, can a human brain adapt to such a behaviour or is it just confusing? cheers, AC

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• Library to analyse sound

  - by Ockonal

  Hello, I need in analyzing system output sound runtime. OS: Linux. The first thing I need is get different frequency values. Programming language: c++.

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• Any application to bind documents of different kind

  - by Codeslayer

  A situation that may be quite common in offices is: We communicate with clients over e-mails, exchange documents and spreadsheets with them. Is there any tool which will help me in binding all these outputs. Maybe I may get flamed on this as this is not exactly a programming question. But some inputs may certainly help me. Thanx

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• What potential do you see in Silverlight?

  - by Cyril Gupta

  Silverlight has been available since quite some time, and Silverlight 2 allows .Net programming on the front-end. I've been thinking about the apps that I can make using Silverlight, but I can't decide if I should go for development in Silverlight because i am still concerned about accessibility and acceptance. What potential do you see in Silverlight judging from the current trends, and what do you think Silverlight will be used for in the coming years?

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• Which is the fastest way to retrive all items in SQLite?

  - by sxingfeng

  I am programming on windows, I store my infors into sqlite. However I find to get all items is a bit slow. I am using the following way: select * from XXX; retriving all items in 1.7M SQLite DB takes about 200-400ms, It is too slow. Can Anyone Help! Many Thanks!

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• Most interseting feature in C language

  - by Renjith G

  hi, Can anybody explain me the most interesting feature of C language apart from other languages. Am expecting some nice replies , so that every one can brush up their own programming skills /Kanu__

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• Assigning a Background image to CGRect Object!

  - by taimur-hamza

  hi guys , I am new to iphone Programming . I have a rectangle on which i display some data. I want to assign an image to its background. And is it possible that the data would be visible even after the image is assigned . Any idea how i can do it ? Thanks

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• Is it safe now to develop web application with HTML 5 specifications?

  - by Morteza M.

  Is it safe now to develop web application with HTML 5 specifications? or should we wait longer for final standards? I want to start developing a new project. I want it to be up to date in every aspects. should I wait more for html 5 or I can start programming based on it?

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• How to put theory into practise

  - by Dave greg

  I like to read alot of IT books e.g programming / functional. But the problem is that after reading I cannot find reasons to put it into practise and I soon forget what I read. Any advise?

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• Are there machine (and human) readable specification languages for algorithm collections and meta-li

  - by Jabavu Adams

  Is there high-level language out there for describing algorithms, that's geared towards specification, rather than implementation? The idea would be to have a machine-readable archive of standard algorithms, with machine-readable annotations on trade-offs, and variants. I'm thinking of something like CycL / OpenCyC, but for algorithms and programming patterns.

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• Could anyone tell me something about Scheme Common-Lisp and FASL File.

  - by Joe

  Does anyone could tell something about these file? As I know: 1. Common-Lisp and Scheme are both some lisp programming langue. 2. common-Lisp source file *.lisp can be compiled into binary file *.fasl which can be load faster than the source file. Q:Can the Scheme source code *.scm be compiled into some binary file that will be load faster than the source code? Thanks in advance joe

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