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• Upload image file: is compression on client side already possible?

  - by Chris

  When offering photo file uploading, usually the user will have badly compressed and huge (10+ megapixels) JPEG files from their cameras or phones. On the server side, these files will get re-compressed to something like 800x600px and JPEG quality 7 or 8. Is it (already) possible to do that re-compression on the client side? So that I would only need to transmit some 100kB (800x600px) and not 3 MB or more. Something like: (1) With javascript's new FileSystem API ( http://slides.html5rocks.com/#filewriter ) it would be possible to read the photo file's data into client side JS. (2) Then it would be necessary to re-encode the JPEG data, which is possible, but I counld not find any library for that (yet). Anybody knows such a library? (3) Last step would be to POST the re-compressed JPEG data to the server side for storage and get a URL to the stored photo file back from the server for inclusion into the client's HTML. I am looking for some jQuery plugin, other JS library or example web page that does this.

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• My computer boots up with Ubuntu: How can I tell what's on my hard disk?

  - by Larry Harson

  I've acquired an old laptop (Acer TravelMate 4050 with an Italian keyboard) that boots up with the following options: Ubuntu, with Linux 3.0.0-12-generic Ubuntu, with Linux 3.0.0-12-generic (recovery mode) Memory test (memtest86+) Memory test (memtest86+, serial console 115200) When I choose the first option, the screen just goes blank with a flashing cursor. But I can go into grub command mode by typing 'c'. Now, I want to know what operating system is installed, and the files stored on my computer, so how do I do this? What can I do to maximise the use of this computer in its current state?

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• How to refuse to give an access to passwords to a customer without being unprofessional or rude?

  - by MainMa

  Let's say you're creating a website for a customer. This website has its own registration (either combined with OpenID or not). The customer asks you to be able to see the passwords the users are choosing, given that the users will probably be using the same password on every website. In general, I say: either that it is impossible to retrieve the passwords, since they are not stored in plain text, but hashed, or that I have no right to do that or that administrators must not be able to see the passwords of users, without giving any additional details. The first one is false: even if the passwords are hashed, it is still possible to catch and store them on each logon (for example doing a strange sort of audit which will remember not only which user succeeded or failed to logon, but also with which password). The second one is rude. How to refuse this request, without being either unprofessional or rude?

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• Where does UBB store its settings?

  - by pjmorse

  We're moving a UBB forum from one host to another. (This is temporary; we're going to replace the forum eventually, but moving hosts has a higher priority.) We don't have a lot of experience with UBB, so we're feeling our way along in the dark. We got the UBB code installed on the new host, and we've done a dry-run database export from the original site to the new site. However, almost everything set in UBB's Control Panel section didn't come with the database export. If UBB doesn't store this data in the database, where is it stored? And if it is in the database, why would it not show up in a new forum when the database is imported? Did we somehow miss a table?

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• Several classes need to access the same data, where should the data be declared?

  - by Juicy

  I have a basic 2D tower defense game in C++. Each map is a separate class which inherits from GameState. The map delegates the logic and drawing code to each object in the game and sets data such as the map path. In pseudo-code the logic section might look something like this: update(): for each creep in creeps: creep.update() for each tower in towers: tower.update() for each missile in missiles: missile.update() The objects (creeps, towers and missiles) are stored in vector-of-pointers. The towers must have access to the vector-of-creeps and the vector-of-missiles to create new missiles and identify targets. The question is: where do I declare the vectors? Should they be members of the Map class, and passed as arguments to the tower.update() function? Or declared globally? Or are there other solutions I'm missing entirely?

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• Event Handlers and Automatic Postback in ASP.NET 3.5 Web Controls

  In one of last week s tutorials Creating Database-Driven ASP.NET 3.5 Input and List Web Controls you learned how to create a dynamic input web control that instead of setting values statically stored its list and values directly from the MS SQL server 2 8 database. This tutorial is a sequel to that article. It deals mostly with the server side coding aspect of dynamic web controls. It is recommended that you read the earlier tutorial first as the Visual Web Developer Project in that tutorial will be used extensively in this article.... Download a Free Trial of Windows 7 Reduce Management Costs and Improve Productivity with Windows 7

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• JavaOne 2012: JDBC Community Discussion

  - by sowmya

  At JavaOne2012, Mark Biamonte of DataDirect Technologies and Lance Andersen of Oracle organized a discussion about JDBC. To learn more about using JDBC to develop database applications, see the JDBC trail in the Java Tutorials. You will know how to use the basic JDBC API to * create tables * insert values into them * query the tables * retrieve the results of the queries * update the tables In this process, you will learn how to use simple statements and prepared statements, and see an example of a stored procedure. You will also learn how to perform transactions and how to catch exceptions and warnings. - Sowmya

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• TGA loader: reverse y-axis

  - by aVoX

  I've written a TGA image loader in Java which is working perfectly for files created with GIMP as long as they are saved with the option origin set to Top Left (Note: Actually TGA files are meant to be stored upside down - Bottom Left in GIMP). My problem is that I want my image loader to be capable of reading all different kinds of TGA, so my question is: How do I flip the image upside down? Note that I store all image data inside a one-dimensional byte array, because OpenGL (glTexImage2D to be specific) requires it that way. Thanks in advance.

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• Extracting, Transforming, and Loading (ETL) Process

  The process of Extracting, Transforming, and Loading data in to a data warehouse is called Extract Transform Load (ETL) process.  This process can be used to obtain, analyze, and clean data from various data sources so that it can be stored in a uniform manner within a data warehouse. This data can then be used by various business intelligence processes to provide an organization with more of an in depth analysis of the current state of the company and where it is heading. A standard ETL process that might be used by a health care system may include importing all of their patients names, diagnoses and prescriptions in to a unified data warehouse so that trends can be spotted in regards to outbreaks like the flu and also predict potential illness that a patient might be affected by based on other patients with similar symptoms.

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• How can I change the folder icon?

  - by Jakob

  I know how to change an icon this way. What I'm looking for is an equivalent to changing the icon for an application in the launcher, i. e. the Home folder, via gedit ~/.local/share/applications/nautilus-home.desktop That way you can set an icon type, which is helpful when you later want to change the icon set resp. theme or when you want the best resolution for each size of the icon. So, I know how I can do this for applications in the launcher - but how can I realize this for icon folders in Nautilus? (In which file these settings are stored and editable whith i. e. Gedit?)

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• What are the caveats of the event system built on Messenger rather than on classic .NET events?

  - by voroninp

  MVVM Light and PRISM offer messenger to implement event system. the approximate interface looks like the following one: interface Messanger { void Subscribe<TMessageParam>(Action<TMessageParam> action); void Unsubscribe<TMessageParam>(Action<TMessageParam> action); void Unsubscribe<TMessageParam>(objec actionOwner); void Notify<TMessageParam>(TMessageParam param); } Now this model seems beneficial comparing to classic .net events. It works well with Dependency Injection. Actions are stored as weak references so memory leaks are avioded and unsubscribe is not a must. The only annoyance is the need to declare new TMessageParam for each specific message. But everything comes at a cost. And what I'm really worried about is that I see no shortcomings of this approach. Has anoyne the experience of some troubles with this design pattern?

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• rotate opengl mesh relative to camera

  - by shuall

  I have a cube in opengl. It's position is determined by multiplying it's specific model matrix, the view matrix, and the projection matrix and then passing that to the shader as per this tutorial (http://www.opengl-tutorial.org/beginners-tutorials/tutorial-3-matrices/). I want to rotate it relative to the camera. The only way I can think of getting the correct axis is by multiplying the inverse of the model matrix (because that's where all the previous rotations and tranforms are stored) times the view matrix times the axis of rotation (x or y). I feel like there's got to be a better way to do this like use something other than model, view and projection matrices, or maybe I'm doing something wrong. That's what all the tutorials I've seen use. PS I'm also trying to keep with opengl 4 core stuff. edit: If quaternions would fix my problems, could someone point me to a good tutorial/example for switching from 4x4 matrices to quaternions. I'm a little daunted by the task.

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• Keyboad layout: In 13.10, modified symbols do not apply

  - by MPi

  I like to tweak my Colemak layout a bit, so I changed /usr/share/X11/xkb/symbols/us to contain my changes. Sure, they get lost on an upgrade, but that is not very often. After upgrading to 13.10, this does not work anymore. I changed the file, but the changes are not applied. Neither when I use the settings program, nor when I issue setxkbmap 'us(colemak)' directly. Where is this data stored now, is there some kind of cache?

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• TechEd 2014 Day 4

  - by John Paul Cook

  Many people visiting the SQL Server booth wanted to know how to improve performance. With so much attention being given to COLUMNSTORE and in-memory tables and stored procedures, it is easy to overlook how important tempdb is to performance. Speeding up tempdb I/O improves performance. The best way to do this is to not do the I/O in the first place. With SQL Server 2014, tempdb page management is smarter. Pages are more likely to be released before being unnecessarily flushed to disk. Read more about...(read more)

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• When is it appropriate to use colour in a command-line application?

  - by marcoms

  Currently I have a command-line application in C called btcwatch. It has a -C option that it can receive as an argument that compares the current price of Bitcoin with a price that was stored beforehand with -S. Example output with this option is: $ btcwatch -vC # -v = verbose buy: UP $ 32.000000 USD (100.000000 -> 132.000000) sell: UP $ 16.000000 USD (100.000000 -> 116.000000) The dilemma is whether to use colour for the UP or DOWN string (green and red, respectively). Most command-line applications I know of (apart from git) stay away from colour in their output. In my desire for btcwatch to look and be quite "standard" (use of getopt, Makefiles, etc), I'm not sure if colour would look out of place in this situation.

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• T-SQL Snack: How Much Free Storage Space is Available?

  - by andyleonard

  Introduction Ever have a need to calculate the total available storage space for a server? Recently I did. Here's a solution I came up with - I bet someone can do this better! xp_fixeddrives There's a handy stored procedure called xp_fixeddrives that reports the available storage space: exec xp_fixeddrives This returns: drive MB free ----- ----------- C 6998 E 201066 Problem solved right? Maybe. The Sum What I really want is the sum total of all available space presented to the server. I built this...(read more)

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• Processing a stream. Must layers be violated?

  - by Lord Tydus

  Theoretical situation: One trillion foobars are stored in a text file (no fancy databases). Each foobar must have some business logic executed on it. A set of 1 trillion will not fit in memory so the data layer cannot return a big set to the business layer. Instead they are to be streamed in 1 foobar at a time, and have business logic execute on 1 foobar at a time. The stream must be closed when finished. In order for the stream to be closed the business layer must close the stream (a data operation detail), thus violating the separation of concerns. Is it possible to incrementally process data without violating layers?

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• Funnel Visualisation not showing drop out in steps

  - by cjk

  I have a site where users will follow this path (hopefully): mysite.com/entity mysite.com/entity/pay mysite.com/entity/pay/details mysite.com/entity/pay/confirmation mysite.com/entity/pay/payment mysite.com/entity/paymentsuccessful?lotsofuniquestuff The entity section could be any one of a multitude of entries, but once the user is on a journey it will stay consistent. I have a goal set up for this as a regular expression, with the match being .*PaymentSuccessful.*. This detects goal successes perfectly (as checked with data stored by the site directly). I have set the following steps within the goal: /[a-zA-Z0-9]+/pay /[a-zA-Z0-9]+/pay/details /[a-zA-Z0-9]+/pay/confirmation /[a-zA-Z0-9]+/pay/payment My funnel detects entry into the funnel (e.g. 47 users) of which say 10 complete the funnel. However, all drop offs are after the first step, even though the exist page is listed as the second step! My data also suggests users are getting further in the funnel before failing to reach the goal. What have I done wrong?

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• Is it possible to allow the User Account to access the 'Volumes' without asking the Administrator's password?

  - by Tom

  Am the administrator of my Ubuntu system. Recently I added a new user account. But when ever the user tries to access or open the 'Volumes'(Drives where movies, songs and other files are stored) it asks for the Administrator's password. I created the user account to my other family members and I don't want to tell them my password. So is it possible to allow them to access the Volumes without asking Administrator's password ? UPDATE : Ubuntu was installed alongside Windows in my system. I will provide a screenshot of the Volume details -

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• Hosting server application for global SME

  - by BBe

  We are planning to set up a complete ERP and CRM system for a medium-sized global company, that might turn into a essential tool for all locations once deployed. For now these locations include USA, Germany, China and Indonesia, but the list is growing quickly. My question is, where it is best to physically locate the server to ensure the access times are optimal from all (future) locations? On my mind, I am dealing with multiple connected servers (a cloud?), where each of our users is served by the physically closest server. Being in a very competitive field we would also like to rule out, that any data is stored in mainland China... Thanks for any advice and pointers!

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• How do I reset my display settings from the command line?

  - by Trevor

  I'm running 12.10 on a dell e5400 laptop and I used xrandr to get the dual monitors working that I connect through a laptop dock. I used xrandr again to switch back to the laptop display when I undocked. The problem is, after a restart, the laptop seems to want to come back up with the dual monitor configuration and the laptop screen stays blank. I can boot into single user mode but I'm not sure what to do from there to get the display settings reset. Any ideas? There's no xorg.conf file so I'm not sure where the settings are stored anymore. Thanks.

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• Get a new instance with StructureMap

  - by Aligned

  It took me too long to figure this out, so hopefully it will help you. StructureMap has way that will create a new instance of the object every time, instead of storing this in the container. I’m going to use this for the DBContext and for WCF Service references. Since the ObjectFactory is a static class, MVC will have these stored in memory without this. Credit goes to Joshua Flanagan for answering my question.[TestMethod] public void GetConcreteInstanceOf_ShouldReturn_DifferentInstance() { ObjectFactory.Initialize(registry => { // set it up so that it's new every time // use this for DBContext and service references registry.For<ISystemDataService>().Use(() => new SystemDataService()); }); ISystemDataService result = Resolver.GetConcreteInstanceOf<ISystemDataService>(); ISystemDataService result2 = Resolver.GetConcreteInstanceOf<ISystemDataService>(); Assert.AreNotSame(result, result2); }

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• Handling hitboxes

  - by TheBroodian

  So I have an issue that I'm laughing at myself about, because it really seems like it should be something that I should be able to figure out pretty quickly. I am designing a 2D action platformer; I have a playable character, and a dummy 'punching bag' character for testing purposes that I've created. I've just gotten enough of both of them done that I can start prototyping and testing them in runtime. Then I realized- neither of them have references of each other (intentionally so), so how do I check for hitboxes stored within my playable character from my dummy character? Long story short, how do I make my dummy know when he's been punched by my hero?

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• How to deploy a single website to multiple physical servers.?

  - by user70122

  I want to deploy my PHP and Ajax based Dating website to multiple physical servers. Does anyone know the method. Is there possible any method to save the files and setting (and also the user input), on all of the physical server, so that the servers do the following jobs. Servers used as a network, speeding up the process giving a robust thing to the end user. Data to be stored on all the servers' hard drivers, and Every server have the internet connection from different provider, so for example a. if any of the internet providers gets down, or b. there occur any hardware or power failure, the website still runs, without a break and without any data loss. Does anyone know about some online course, or some comprehensive tutorials about this topic ?

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• SQL binary value to PHP variable leading zeros

  - by Agony

  Using sql query to pull data from a mssql database results in a value that still has leading zeros. The data in database is stored as binary(13) - so it will pull all 13 digits. However the value is a text, so any leading zeros will generally show up as '?' in a form on the site - and in return will update wrong data to the database later. So what i need is to only select/display the text itself, not all 13 bytes. using: SELECT CONVERT(char,uilock_pw) AS uipwd FROM tbl_UserAccount or SELECT uilock_pw FROM tbl_UserAccount still adds the leading zeros to the char array. Example in database: 0x71776531323300000000000000 Would show up as: qwe123??????? But should be: qwe123 Im not even sure what character those ? represent. Using Echo results in a normal qwe123 - but not in a form.

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