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  • What version will be chosen by MSXML2.XMLHTTP request, without version suffix? [migrated]

    - by jayarjo
    Probably every web developer is familiar with a pattern like this: var xmlHttp = null; if (window.XMLHttpRequest) { // If IE7, Mozilla, Safari, and so on: Use native object. xmlHttp = new XMLHttpRequest(); } else { if (window.ActiveXObject) { // ...otherwise, use the ActiveX control for IE5.x and IE6. xmlHttp = new ActiveXObject('MSXML2.XMLHTTP'); } } But the question is - if there are multiple MSXML versions available on the client's PC (let's say 3.0, 5.0, 6.0), which one of them will be chosen by MSXML2.XMLHTTP call (notice no version suffix at the end)? Will it be the latest or - not necessarily? And a side-question - is it possible to check which version was chosen?

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  • What is this called?

    - by robertlewis2001
    I'm hoping there's a book or something out there for me to get... If I have a class that has Collection as an instance variable, what is that method of coding called? A design pattern? If so, where can I find more information on it? As I've been working with this mentor, he's really helped me understand my programming weakness and that weakness is thinking in terms of collections or relationships between objects. It just seems so difficult for me right now and I need to read to become smarter. My mentor is a great guy, but he gets frustrated when I start asking lots of questions, so I'm starting to feel like I need to learn more on my own. public class Evaluation { private List<Criterion> criterion = null; public Evaluation() { criterion = new List<Criterion>(); } }

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  • My laptop doesn't always boot to login

    - by GUI Junkie
    I have an recurring problem. Every once in a while, no pattern, the laptop freezes during boot. Sometimes at a black screen, sometimes a black screen with a not blinking cursor... The solution is to power down the laptop, cross my fingers and boot again. Sometimes it takes four or five reboots, but in the end I always get the system up and running. What bugs me is the fact that the boot is not 'stable' in a sense that apparently it doesn't always do exactly the same thing. I'm still using 10.10. The question is whether there is anything that can be done to make the system stable. (Does 11.04 have the same issue?) Edit: Today the same thing happened. First a black screen with a non blinking cursor. Second a black screen. Third login screen.

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  • Point domain to new host - changed nameservers, now what?

    - by Larry
    This is driving me nuts, because I know I'm missing something simple. I've read numerous articles/posts about how to point (not transfer) your domain to a new web host. They all say to change the name server settings at your old host, so here is what I did: On old host (1and1.com) changed the name server settings to those of my new host (inmotionhosting.com) like below: Domain name : mydomain.com Name server 1: ns.inmotionhosting.com Name server 2: ns2.inmotionhosting.com ... and confirmed this is active (did it a couple days ago) This is where every post/article I've found stops. They imply this is all that needs to be done. But how does the new host know to point the domain to my account, and the directory in my account I want it work from?? There's go to be something else to be done - just pointing to the generic name servers of the new host can't be all there is to it. Thanks in advance...I'm bewildered...

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  • Why is ComboBoxText giving me a "no attribute" error?

    - by boywithaxe
    I'm trying to add a text Combo Box into my app. I've created in and populated the list but when I I try to print out the active text I get an error. Here's the part of the code in question: def on_netif_changed(self, widget): netif = widget.gtk_combo_box_text_get_active_text() print netif And the error I get: Traceback (most recent call last): File "/home/boywithaxe/Developer/Quickly/broadcast/broadcast/BroadcastWindow.py", line 44, in on_netif_changed netif = widget.gtk_combo_box_text_get_active_text() AttributeError: 'ComboBoxText' object has no attribute 'gtk_combo_box_text_get_active_text' I'm a bit at a loss here, I've no problem betting text from text boxes, but this seems a completely different issue. I tried RTFMing but came up short. I would appreciate any suggestions.

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  • Repositories and the Save Method

    One of the questions I've been getting lately goes like this: Should a Repository class have a Save method? And the standard answer: It depends. It's hard to keep track of all the different approaches to implementing the repository pattern these days, but I assume when someone asks me this type of question they are thinking of using code like this: var employee = new Employee(); employeeRepository.Save(employee); var account = new Account(); accountRepository.Save(account); This...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Why do most of us use 'i' as a loop counter variable?

    - by kprobst
    Has anyone thought about why so many of us repeat this same pattern using the same variable names? for (int i = 0; i < foo; i++) { // ... } It seems most code I've ever looked at uses i, j, k and so on as iteration variables. I suppose I picked that up from somewhere, but I wonder why this is so prevalent in software development. Is it something we all picked up from C or something like that? Just an itch I've had for a while in the back of my head.

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  • MVC? patterns for game development? [closed]

    - by davivid
    Possible Duplicate: MVC-like compartmentalization in games? I am thinking of the best way to structure my project and was thought a MVC style pattern would be appropriate. Would be correct having the model handle the majority and basically being the game engine? Are there any standardised patterns recommended for simple game development? Model / Game Engine Data: Level Design, Chat feeds, etc Game Status: Player status, Enemy status, World Status etc etc. Engine: Physics, Collisions, AI View 3D: Gameplay, Camera, Rendering... 2D: UI etc Controller: Player Input UI Input

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  • Processing a list of atomic operations, allowing for interruptions

    - by JDB
    I'm looking for a design pattern that addresses the following situation: There exists a list of tasks that must be processed. Tasks may be added at any time. Each task is wholly independent from all other tasks. The order in which tasks are processed has no effect on the overall system or on the tasks themselves. Every task must be processed once and only once. The "main" process which launches the task processors may start and stop without warning. When stopped, the "main" process loses all in-memory data. Obviously this is going to involve some state, but are there any design patterns which discuss where and how to maintain that state? Are there any relevant anti-patterns? Named patterns are especially helpful so that we can discuss this topic with other organizations without having to describe the entire problem domain.

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  • How long till HTML5 canvas becomes a viable game development platform?

    - by Shouvik
    So I have been working on web application. So invariably what it boils down to is making simple games which were previously based on flash or openGL. Now I know apple was moving away from flash because its proprietary unlike their stance that its got "pathetic performance"! Not true, try playing a canvas game, I can assure you at any point of time (including when its idle) it will use up a fair bit of processing power just to redraw the UI. Now I do understand that this is my fault because when the game is not active I should not be redrawing the canvas, but honestly its a lot of work and I suppose there should be libraries which should be able to assist me with that! So, how much will it be before I see a decent canvas library which handles these "tiny" issues for me? I can't honestly expect Steve Jobs to be doing anything more for HTML5! I someone knows of a good library, I am all ears...! :) PS: I use mootools and am presently using Mootools Canvas Library.

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  • Best practices for launching a new software version

    - by steve
    I rebuilt a web app to replace a version that we have been using for the last 3-4 years. We have a few thousand clients and a few hundred active users per day. The functionality is basically the same. The new version is a little bit faster with a few enhancement features and there are a lot of behind the scenes changes that the clients will never see. The UI is quite different but ultimately much easier to use and navigate. How should I go about having our clients stop using the old system and start using the new one? I am currently putting together a video that will play on the web site as well as within the app. The video will go through the pages and focus on some key changes. I was also thinking about an intro page that will display once the user logs in and explains some of the features.

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  • How to tweak the appearance of desktop icons in Lubuntu?

    - by vasa1
    In Ubuntu 11.10 with Nautilus it was possible to tweak the appearance of desktop icons by editing nautilus.css as I had posted in How can I change the text colour on my desktop icons?. In Xubuntu the same can be done by adding a few lines to one's .gtkrc-2.0 as described in How to highlight items on Desktop using xfce?. In both cases, it is possible to assign colors to the various icon states (such as normal, selected and active). My question is this: is it possible to do the same in Lubuntu? PCManFM seems to be responsible but I can't find any GUI or files to edit for the purpose. The default ~/.config/pcmanfm/lubuntu/pcmanfm.conf doesn't have any relevant settings.

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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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  • SQL SERVER Merge Operations Insert, Update, Delete in Single Execution

    This blog post is written in response to T-SQL Tuesday hosted by Jorge Segarra (aka SQLChicken). I have been very active using these Merge operations in my development. However, I have found out from my consultancy work and friends that these amazing operations are not utilized by them most of the time. Here is my [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Qt Creator 2.8 sort en RC, la nouvelle préversion ajoute un meilleur support de LLDB, le débogueur de LLVM/Clang

    C'est aujourd'hui que sort Qt Creator 2.8.0 bêta. Grâce à plus de 60 contributeurs, un grand nombre de fonctionnalités a été ajouté et de nombreux bogues ont été corrigés.Les nouveautés sont trop nombreuses pour toutes être passées en revue ici, comme habituellement, voyons simplement les plus grosses nouveautés.Vous pouvez maintenant ouvrir une nouvelle fenêtre d'édition avec Fenêtre > Séparer la nouvelle fenêtre. Cela ouvre une nouvelle zone qui se comporte comme la zone principale de Qt Creator (vous pouvez par exemple diviser à nouveau cette zone). L'ouverture d'un document ouvrira à présent le fichier dans la dernière zone d'édition active. Ces modifications soulèvent d'importantes questions d'ergonomie. C'est pourquoi nous aimerions votre avis, appréciez-vous l...

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  • Get and set accessors do they protect different instances of a variable?

    - by Chris Halcrow
    The standard method of implementing get and set accessors in C# and VB.NET is to use a public property to set and retrieve the value of a corresponding private variable. Am I right in saying that this has no effect of different instances of a variable? By this I mean, if there are different instantiations of an object, then those instances and their properties are completely independent right? So I think my understanding is correct that setting a private variable is just a construct to be able to implement the get and set pattern? Never been 100% sure about this.

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  • Pooling (Singleton) Objects Against Connection Pools

    - by kolossus
    Given the following scenario A canned enterprise application that maintains its own connection pool A homegrown client application to the enterprise app. This app is built using Spring framework, with the DAO pattern While I may have a simplistic view of this, I think the following line of thinking is sound: Having a fixed pool of DAO objects, holding on to connection objects from the pool. Clearly, the pool should be capable of scaling up (or down depending on need) and the connection objects must outnumber the DAOs by a healthy margin. Good Instantiating brand new DAOs for every request to access the enterprise app; each DAO will attempt to grab a connection from the pool and release it when it's done. Bad Since these are service objects, there will be no (mutable) state held by the objects (reduced risk of concurrency issues) I also think that with #1, there should be little to no resource contention, while in #2, there'll almost always be a DAO waiting to be serviced. Is my thinking correct and what could go wrong?

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  • How can I use a .html file as desktop background/wallpaper?

    - by dudealfred
    I have one of those underpowered netbooks with Lubuntu. I also have an iPod Touch. I'd like the best of both worlds. So I would like to create an active html wallpaper with beautiful little squared icons to launch my webapps through Chromium/Firefox. I've read a bit, but it looks like there isn't really anything that would allow for that. Why? Does anyone have any other alternatives (apart from buying an iPad)? :)

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  • Force Unity to open any file with any program

    - by Strae
    When you drag a file to the Unity launcher, only the applications that are supposed to open that file will remain active, while all others become deactivated. Is it possible to configure Unity to ignore that setting and open the file, no matter what extension the file has, with any of the applications on the launcher? I'd be glad to get an unsupported file type from the application when I make a mistake instead of losing a bunch of time configuring what application can open what file (that's because it is no longer possible to add a custom application/path in the Open with... menu)

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  • ubuntu freezes right after loading

    - by toast
    new install of ubuntu 12.04 i386 desktop.iso on a toshiba satellite intel celeron m gets to the desktop screen and freezes the mouse still moves but nothing responds to it started terminal by pressing ctl+alt+f1 tried "startx" and got this(i cant copy and paste but i will do my best to avoid typos): fatal server error: server is already active for display 0 if this server is no longer running, remove /tmp/.X0-lock and start again please consult the x.org foundation support for help ddxSgiveup: closing log XIO: fatal IO error 11 (resource temporarily unavailable) on x server ":0" after 7 requests (7 known processed) with 0 events remaining. xxxxxx@aaaaaa-Satellite-a105:~$ tried "startx --:1" just took me back to the default wallpaper with nothing else mouse still moves but nothing else

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  • Optimize bootup sequence

    - by ubuntudroid
    I'm on Ubuntu 11.04 (upgraded from 10.10) and suffering really high bootup times. It got so annoying, that I decided to dive into bootchart analysis myself. Therefore I installed bootchart and restarted the system which generated this chart. However, I'm not really experienced in reading such stuff. What causes the long bootup sequence? Edit: Here is the output of hdparm -i /dev/sda: /dev/sda: Model=SAMSUNG HD501LJ, FwRev=CR100-12, SerialNo=S0MUJ1EQ102621 Config={ Fixed } RawCHS=16383/16/63, TrkSize=34902, SectSize=554, ECCbytes=4 BuffType=DualPortCache, BuffSize=16384kB, MaxMultSect=16, MultSect=16 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=976773168 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120} PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6 AdvancedPM=no WriteCache=enabled Drive conforms to: unknown: ATA/ATAPI-3,4,5,6,7 * signifies the current active mode And here the output of hdparm -tT /dev/sda /dev/sda: Timing cached reads: 2410 MB in 2.00 seconds = 1205.26 MB/sec Timing buffered disk reads: 258 MB in 3.02 seconds = 85.50 MB/sec

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  • Is the UX affected negatively by fully cacheable pages?

    - by ChocoDeveloper
    I want to have fully cacheable pages in my websites, but one cannot do that if they contain user-specific data, like the userbar or things in the UI that can change depending on the permissions the user has. So I was thinking whether it was possible to pull everything that is user-specific via ajax, and update the UI accordingly. But I'm worried that this might be annoying for the user, and also it might be difficult to develop. What do you think? Is there a pattern or something I can follow to deal with this?

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  • Oracle Event: Database Enterprise User Security

    - by user12603048
    One of the high-value benefits of an integrated Identity and Access Management platform is the ability to leverage a unified corporate directory as the primary authentication source for database access. On July 11, 2012 at 08:00 am PDT, Oracle will host a webcast showing how Enterprise User Security (EUS) can be used to externalize and centrally manage database users in a directory server. The webcast will briefly introduce EUS, followed by a detailed discussion about the various directory options that are supported, including integration with Microsoft Active Directory. We'll conclude how to avoid common pitfalls deploying EUS with directory services. Discussion topics will include Understanding EUS basics Understanding EUS and directory integration options Avoiding common EUS deployment mistakes Make sure to register and mark this date on your calendar! - Click here to register.

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  • Fujitsu B6220 laptop, sometimes my desktop freezes upon resume from standby

    - by user89756
    I installed Ubuntu 11.10 on my Fujitsu Lifebook B6220 laptop just before 12.04 was released. I can not remember if I had this issue with Ubuntu 11.10 as I updated the install to 12.04 about a week after 12.04 came out. My problem is that sometimes upon resume from standby my desktop is frozen. The keyboard, touch pad, and touchscreen work, but there is no response from the desktop. I can ctrl-alt-f2 and log in and then from there I just reboot the computer. This happens about 50% of the time when I resume from standby but I have not noticed a distinct pattern. I have thought about reinstalling 12.04, since I upgraded 11.10 to 12.04 instead of a fresh install. But I have customized my laptop a lot and I would prefer to avoid reinstalling it, I'm not even sure if that would fix it. Anyone have a idea what might be the problem? If I should submit this as a bug, could someone point me in the right direction please? Thanks, Matt

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  • How to design 2D collision callback methods?

    - by Ahmed Fakhry
    In a 2D game where you have a lot of possible combination of collision between objects, such as: object A vs object B = object B vs A; object A vs object C = object C vs A; object A vs object D = object D vs A; and so on ... Do we need to create callback methods for all single type of collision? and do we need to create the same method twice? Like, say a bullet hits a wall, now I need a method to penetrate the wall for the wall, and a method to destroy the bullet for the bullet!! At the same time, a bullet can hit many objects in the game, and hence, more different callback methods!!! Is there a design pattern for that?

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