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  • C# How to create objects without class definitions?

    - by JL
    Is it possible to create objects at designtime without having to have hard coded class definitions, then populate properties with primitives or even strongly typed data types? This might sound confusing, so I will attempt to give you a use case scenario. Use case: You have an XML config file that could hold configuration values for connecting to various systems in an SOA application. In C# the XML file is read, but for each system the configuration properties are different (e.g: SQL might have a connection string, while SharePoint might need a username + password + domain + url, while yet an smtp server would need username + password + port + url) So instead of creating static classes as follows public class SharePointConfiguration or public class SQLConfiguration, then have each class with custom properties (this is cumbersome) or using a 1990's method, an arrayList or some named collection Is there not a more preferred way to achieve this? Taking advantage of new language features, that can still offer design time intellisense, which would make the code easier to maintain and less prone to error. Thanks

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  • Design Solution For Storing-Fetching Images

    - by Chaitanya
    This is a design doubt am facing, I have a collection of 1500 images which are to be displayed on an asp.net page, the images to be displayed differ from one page to another, the count of these images will increase in the time to come, a.) is it a good idea to have the images on the database, but the round trip time to fetch the images from the database might be high. b.) is it good to have all the images on a directory, and have a virtual file system over it, and the application will access the images from the directory Do we have in particular any design strategy in a traditional database for fetching images with the least round trip time, does any solution other than usage of a traditional database exists? ps: I use SQL Server to store these images.

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  • Creating a Java platform game as easily as possible

    - by directx
    I need to create a Java-based platformer game for a high school project (not computer science related), and I want to spend as little time on technical stuff as possible. I'm already experienced in Java, and I already have most of the gameplay, graphics, etc. All I need to do is code it. I've looked and I'm considering one of two options that do not involving coding a game from scratch: Copy an existing Java platformer (best option, but I can't find an open source Java platformer) Use a Java game engine to avoid coding from scratch. I've looked at JGame but I'm not sure if it's the best bet for a platformer.

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  • Are there still completely new programming languages and -paradigms to be born?

    - by llasa
    Are there still completely new programming languages and -paradigms (which will actually go mainstream and still be used decades after their appearance) to be born? What I'm talking about are groundbreaking things like the rise of object oriented programming, C++, or PHP. With new programming languages I mean that they actually are completely different from what you know, as different as when you set a guy who used assembler for a decade, and even programmed some kind of 3D game in it, in front of something as high-level as PHP, Ruby or Python? Which new paradigms and programming languages are there to come? What could be different about them? Who will possibly create them and how fast will they rise?

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  • running Hadoop software on office computers (when they are idle)

    - by Shahbaz
    Is there a project which helps setup a Hadoop cluster on office desktops, when they are idle? I'd like to experiment with Hadoop/MR/hbase but don't have acces to 5-10 computers. The computers at work are idle after hours and are connected to each other through a very high speed connection. What's more, data on these computers stays within our network so there is no privacy issue. In order for this to work I need a fairly light weight monitor running on each machine. When the computer has been idle for X hours, it will join the cluster. If the user logs on, it has to drop out of the cluster and return all CPU/memory back. Does something like this exist?

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  • Deploying a .Net App Source Control (SVN) over 32-bit AND 64-bit dev stations

    - by Mika Jacobi
    Here is the situation : Our Dev Team has heterogeneous OS systems, scattered between 32-bit and 64-bit. This is not ideal, we are actually planning to homogenize our infrastructure, but in the meantime we have to deal with it. The issue is that when a 32-bit developer checks out a 64-bit solution on SVN, he has to manually change the target platforms all over again to get it compiled (not to mention other side problems) My question is : What clean (though temporary) solution could be addressed in such situation, permitting each developer to keep his default project/platform settings while checking out and in from SVN. I guess that -at least for the first time a project/solution is checked out, a dev still has to tweak the setting manually to compile it properly. After that, according to relevant SVN filters, it is possible to ignore some settings files (which ones, by the way?) I am open to all clever and detailed suggestions. Thanks.

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  • Where can I find the transaction protocol used by Automated Teller Machines?

    - by Dave
    I'm doing a grad-school software engineering project and I'm looking for the protocol that governs communications between ATMs and bank networks. I've been googling for quite a while now, and though I'm finding all sorts of interesting information about ATMs, I'm surprised to find that there seems to be no industry standard for high-level communications. I'm not talking about 3DES or low-level transmission protocols, but something along the lines of an Interface Control Document; something that governs the sequence of events for various transactions: verify credentials, withdrawal, check balance, etc. Any ideas? Does anything like this even exist? I can't believe that after all this time the banks and ATM manufacturers are still just making this up as they go. A shorter question: if I wanted to go into the ATM software manufacturing business, where would I start looking for standards?

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  • What server log file(with Centos5) must I check to locate specific IP activity?

    - by makmour
    Hi! I leasing a dedi server under Centos5, just recently I ve setup a blog website that grabs feeds from other news websites and presents them on my blog. Some days after I see high server loads that cant be coming just from the cron jobs that I run every now and then to grab feeds from other websites for my blog website. Thats why I m trying to pico some log files in order to have a better look the whole problem. These last days I noticed(from statscounter service) the same IP address visiting my blog website many times per day so I want to find out what us trying to do. I tried looking in all /var/log log files and httpd too but no luck. Is there any other log file I should open or any other procedure to track this IP acivity on server?

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  • How to make a div expand vertically to wrap the content within it?

    - by MalcomTucker
    I have a div which wraps a number of images that are generated dynamically. I don't know how high the list of images is. My problem is the div that contains the dynamically generated images doesn't behave like it is housing any content - I want it to extend to the height of the list of images. Each image is itself wrapped in a div. This is the wrapper div: .block { padding:10px; margin-top:10px; height:auto; background-color:#f9f9f9; } This is the markup dynamically generated for (one of) the images: <div class="block"> <div style="float: left; padding: 2px 2px 2px 2px;"><IMG SRC="45.jpg" BORDER="0"/></div> ..... How do I get the block div to extend down with the images? Thanks

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  • getting number of hours until the next event

    - by Andrew Heath
    I've got a table with this data: [ID] [event_name] [last_event] 1 stats 2011-01-01 01:47:32 last_event is a timestamp. The event occurs every 48 hours (it's a cron job). I'd like to show my users the number of hours until the event executes again. So far I've got: SELECT (lastFinish + INTERVAL 48 HOUR) FROM `cron_status` which gives me the exact time and date of the next occurence: 2011-01-03 01:47:32. So I figured if I subtracted the current datetime... SELECT ((lastFinish + INTERVAL 48 HOUR) - SYSDATE()) FROM `cron_status` which (I think?) gives me the difference in unix time: 1980015. But if I divide that by 3600 to convert the seconds to hours... SELECT (((lastFinish + INTERVAL 48 HOUR) - SYSDATE())/3600) FROM `cron_status` I get numbers an order of magnitude too high: 549.99. Where am I going wrong? The target is returning the number of hours until the next execution. Thank you!

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  • Mouse Wheel Scroll - How can I capture the time interval between start and stop of scrolling?

    - by Rahat
    Is there any way to capture the time interval between mouse wheel scroll start and stop? Actually I want to capture the interval between the scrolling start and stop when I very quickly scroll the mouse wheel. I have already looked at MouseWheel event but it don't fulfill my requirement. In senes that it always gives a value of Delta 120 or -120 but i want to call a function depending on the speed of the mouse scroll for example when i scroll the mouse normally i want to perform function 1 and when i scrolled the mouse very quickly i want to perform the function 2. In other words is there any way to distinguish between the mouse scroll high and normal speed. Any advice will be appreciated.

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  • Tool for response time analysis on JBoss server?

    - by Ariel Vardi
    I am running a pretty high traffic cluster of JBoss servers serving REST requests and I am interested in tools reading the access logs in Tomcat format (with %D parameter) to provide a detailed analysis of the response time on a per-call basis. Ideally this tool would generate a chart showing the progression of the response time throughout the day, hour per hour, then a weekly view with averages on the day, and monthly with average on the weeks (CACTI style). I've looked for such tools and couldn't find anything. Is any of you guys aware of something close to that before I start writing my own? I haven't looked into CACTI extensions yet, but that be an option?

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  • Send PHP Mail in intervals

    - by iHeff
    I'm working on a simple text messaging service for my high school's student council and my hosting service only allows 19 PHP mail messages to be sent per minute, so is there a way I can set an interval to only send 15 emails, wait a minute, send another 15, wait, and do so until all the mail is sent? Below is some of my code, all you'll probably need to see is the "foreach" section. $subject = ""; $message = "Hey, $first! $messageget"; $header = 'From: Student Council<[email protected]>' . "\r\n" . 'Reply-To: [email protected]' . "\r\n" . 'X-Mailer: PHP/' . phpversion(); foreach($to as $value) { $result = mail($value, $subject, $message, $header); }

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  • Design interoperable web services

    - by Zyd
    Hi everyone, I'm designing a set of web services to allow our clients to connect from their apps to one of our systems. Our clients have their apps developed in all varieties of frameworks (.NET, Java, PHP, Python and even the occasional all JS app), so obviously WS is the way to go. Investigating a little about truly interop WS I've found that the way to go is to design first the WSDL and XSD and derive the implementations from there. What i'm really looking for is guidance if this is really the way to go. I've read that WCF creates interoperable WS but i'm not a fan of MS creating something standard. Should i use WCF or there is a good set of tools for designing WSDL and XSD without the pain i'm expecting. Thanks in advance

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  • Python 3.1 - Memory Error during sampling of a large list

    - by jimy
    The input list can be more than 1 million numbers. When I run the following code with smaller 'repeats', its fine; def sample(x): length = 1000000 new_array = random.sample((list(x)),length) return (new_array) def repeat_sample(x): i = 0 repeats = 100 list_of_samples = [] for i in range(repeats): list_of_samples.append(sample(x)) return(list_of_samples) repeat_sample(large_array) However, using high repeats such as the 100 above, results in MemoryError. Traceback is as follows; Traceback (most recent call last): File "C:\Python31\rnd.py", line 221, in <module> STORED_REPEAT_SAMPLE = repeat_sample(STORED_ARRAY) File "C:\Python31\rnd.py", line 129, in repeat_sample list_of_samples.append(sample(x)) File "C:\Python31\rnd.py", line 121, in sample new_array = random.sample((list(x)),length) File "C:\Python31\lib\random.py", line 309, in sample result = [None] * k MemoryError I am assuming I'm running out of memory. I do not know how to get around this problem. Thank you for your time!

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  • Database indexes - what should they be

    - by WebweaverD
    Most of my database tables have a clear unique index through which lookups are done 90% of the time but I am a bit unsure on this one - I have a table which keeps track of user rating totals for items in my database, I now want to add another table, to track individual ratings with an ip address column to make sure no one can rate something twice. Since I can see this becoming a big, high use table it is important to optimize it correctly. (MYSQL table) This table will have the following fields: rating_id(always - unique), item_id (always - not unique), user_id (optional - not unique), ip_address (always - not unique), rating_value(always - not unique), has_review(bool) Now I envisions 90% the queries going something like this: When a user rates something - select where item_id = x and ip_address = y, (if rows = 0) insert rating When in user account pages - select where ip_address = x or username = y Now none of the fields searched on are unique, can I still use them as indexes (for example item _id and ip_address), can I have two indexes and will this still improve performance over a non indexed table?

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  • Can a Javascript bookmarklet overlay an image on a web page?

    - by songdogtech
    Can a bookmarklet be used to overlay an image on a web page? Not as a pop-up, but as a image positioned by CSS and with a high z-index to display on top of other elements. And without a mask i.e., Shadowbox or similar jQuery effect. Just an image from a URL and positioned in the bottom left hand corner of the browser window. This is what I have so far, but it may be the wrong direction to be going: javascript:(function(){document.write("body {background-image:url(http://mydomain.com/image.png); position: absolute; left:50px; top:300px; z-index:9999;}");})() I have a JS function that works as a bookmarklet to change the case of text on the page, and now I'd like to be able to show an image when the bookmarklet is used.

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  • Looking for Open-Source or Licensed Personalised Greeting Card software

    - by Mr Pablo
    Before I jump in at the very deep end and try to make my own version of Moon Pig (www.moonpig.com) I would like to know what (if any) software/platforms currently exist that allow for visitors to personalise cards with text and uploaded photos and then purchase printed versions all via a single e-Commerce style platform. I have Googled till my fingers bled and I cannot find anything that matches my needs, which are: admin can provide templates (backgrounds) for the cards users can customise the card with text (font style and colour) users can upload their own photos (minor editing e.g. crop) to insert into the cards user can purchase a printed card via credit card payment Seeing as this kind of e-Commerce has been around for a while now, I would have thought there were some systems to purchase that can provide this functionality?

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  • How to interact between GameCanvas and LCDUI elements on J2ME?

    - by Santiago
    The thing is I writing a J2ME program that fisrt of all show a "menu" using graphics interface (GameCanvas) and when the user select one item, I need to setCurrent that item (ex. a List), but when return from the List (it could be because the user push a Command "Menu" Item) I need to show the menu again. The real problem when the menu show again, the keyPressed() listener of gamecanvas object stop working. Basically I have: A Midlet object with: GameCanvas object instance A List object instance I don't understand how that works, I didn't find tutorial that share low and high graphics-level APIs on one Midlet.

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  • Good workflow for website design

    - by Olav
    I would like some idea about a good workflow for Website Design, with a high degree of "offshoring" (Elance, Odesk etc.). I would to do as much as possible "pre production", with client input, ideas etc. stored in IA diagrams, wireframe mockups etc. in something like a Wiki. Also a like the idea about having different people come up with different design proposals. Wouldlike to have some ideas of costs of different phases and tasks ($, %, hours). With Design I mean roughly the aspects of a site that can be done with client-side tools, especially XHTML and CSS. What other tools should I use than IA diagrams.

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  • Running sites on "localhost" is extremeley slow.

    - by seanxe
    Hello all, Having real trouble using my local host to test sites. It runs extremely slow! Sometimes up to a minute to load a page. I'm using firefox and the sites i'm testing run fine on other developers in my office local machines/ on the production server. I've gone through the normal things :- Disabled IPv6 Not running in debug mood Put the site in the highest app pool (High Isolated) on IIS 6. Taking of firewalls etc. The problem only seems to occur when hitting pages which contain some form of .net code in the code-behind. Appreciate that this a little bit of a vague topic / stab in the dark but would appreciate any sort of advice - it's horrible waiting a minute each refresh to try out a change! Cheers, Sean.

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  • Writing custom Django fields and widgets

    - by hekevintran
    Django has very good documentation that describes how to write custom database fields and custom template tags and filters. I cannot find the document that describes how to write custom form fields and widgets. Does this document exist? The way I've been able to write custom form fields and widgets is by reading the Django source code and imitating what I see there. I know that there are still things about implementing fields and widgets that I do not completely understand because I have not read any high level document that describes their interfaces.

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  • When to choose C over C++?

    - by aaa
    Hi. I have become a fond of C++ thanks to this website. Before, I programmed exclusively in C/Fortran, thinking that C++ was too slow (not anymore). Is there a reason to write new project purely in C? this is besides obvious things like low-level kernel/system components. What about intermediate things, like communication libraries, for example MPI? Is C still more portable than C++? I have messed with pretty exotic systems, like Cray, but have yet to see non-embedded system without C++. thanks

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  • Working with multiple GIT severs

    - by th3flyboy
    Hello, I have a question. Is it possible to set up a system so that you have a private GIT server that you host, which automatically syncs with a remote one, hosted by a site like Sourceforge, and then you can commit your local to the private GIT server, and then when you have to merge the changes from your private wip branches that are on your private GIT over to the master/branch/tag from the public GIT, and then push the change to the public GIT? I ask this because I have a lot of personal work I would like to get working before putting it up for the public to see, and I'm shifting between several computers/operating systems in the process. If this is not possible in standard GIT, are there any other options that would allow me to do this? Thanks, Peter

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  • What Use are Threads Outside of Parallel Problems on MultiCore Systesm?

    - by Robert S. Barnes
    Threads make the design, implementation and debugging of a program significantly more difficult. Yet many people seem to think that every task in a program that can be threaded should be threaded, even on a single core system. I can understand threading something like an MPEG2 decoder that's going to run on a multicore cpu ( which I've done ), but what can justify the significant development costs threading entails when you're talking about a single core system or even a multicore system if your task doesn't gain significant performance from a parallel implementation? Or more succinctly, what kinds of non-performance related problems justify threading? Edit Well I just ran across one instance that's not CPU limited but threads make a big difference: TCP, HTTP and the Multi-Threading Sweet Spot Multiple threads are pretty useful when trying to max out your bandwidth to another peer over a high latency network connection. Non-blocking I/O would use significantly less local CPU resources, but would be much more difficult to design and implement.

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