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• Does this interface already exist in the standard .NET libraries?

  - by VoidStar

  I found myself needing a simple generic interface, and I wrote it, but it turned out to be pretty much the world's simplest interface. I was wondering if it already exists by some other name. I just want to make sure I'm not reinventing something that is already included with the .NET framework. interface IReceiver<T> { void Receive(T obj); } I can't really find a good list of "standard" interfaces that came with .NET. Does the structure of this interface look familiar to anyone? Have I reinvented something that is already standard? EDIT: I have a data object and a number of objects interested in receiving the data. Objects interested in receiving the data implement the interface, so that 'routing' lists and maps can send the data to them. The idea is full generalization in the routing, the routing will be data-driven.

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• Which character is first among 4 characters in c++

  - by Ashiqur Rahman

  In my project I take a string from user and then I need to check if vowels a, e, I, O, U are present. If so, I have to find out which one comes first in the string and which one comes next after that. For example, if a user gave input something like this: char expr[] = "this is for something real"; I comes first, then I again, then O and so on. I checked whether the characters are in the string or not using strchr(expr,'character here'). To find which character comes first, I find the index of each character using const char *ptr = strchr(expr, characters here); if(ptr) { int index = ptr - expr; } After that I check which index is bigger. But this is very long process. Is there a smarter way to do this?

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• XSLT: add node inner text.

  - by nabo

  This is a slightly version of other question posted here: http://stackoverflow.com/questions/2888880/xslt-change-node-inner-text Imagine i use XSLT to transform the document: <a> <b/> <c/> </a> into this: <a> <b/> <c/> Hello world </a> In this case i can't use neither the <xsl:strip-space elements="*"/> element or the [normalize-space() != ''] predicate since there is no text in the place where i need to put new text. Any ideas? Thanks.

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• How to controll (and emulate) monitor/projector on Linux?

  - by klew

  I would like to write some C/C++ program to controll monitor/projector attached to my computer. I've googled around, but I couldn't find almost anything that would lead me in some direction. Do you know where I can learn about it? What I would like to do is to write "Hello world" on an external monitor. It would be also nice to have some "monitor emulator" that will act as physicaly attached monitor (or to write program to emulate it). I'm not sure if it is possible. I couldn't find anything like this. I'm working on Ubuntu 9.10 with Gnome.

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• Does this pattern have a name?

  - by LK7jb

  Disclaimer: I'm trying to learn proper OO programming/design, so I'm pretty new to this stuff. I guess this is a general design patterns question, but I'll base my example on a game engine or something that renders objects to the display. Consider the following: How can this sort of separation between physical objects (e.g., cubes, spheres, etc.) and the rendering mechanism be achieved in an extensible manner? This design is not set in stone, and perhaps I've got something wrong from the start. I'm just curious as to how a problem like this is solved in real world code.

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• Simple Sinatra Ajax Not Working

  - by proteantech

  I was trying make an AJAX call from a static file on my computer to a simple sinatra service. The ajax call was returning with an error and no details. The server logged no errors either. Another strange symptom was that the Origin in the request header was null. I turns out that you can't make cross domain ajax calls without a little extra effort. You can set the Access-Control-Allow-Origin header on your sinatra response to expose your service to external domains using a snippet like this: get '/hi' do response['Access-Control-Allow-Origin'] = '*' content_type 'text/plain' "Hello World" end There's also another header you can set to allow other HTTP Methods besides gets, Access-Control-Request-Method. You can find more information by searching around for CORS: Cross Origin Resource Sharing and the previously mentioned headers. Oh, and in case you want to do this in Rails as well you can do something like this in your controller: after_filter :set_access_control_headers def set_access_control_headers headers['Access-Control-Allow-Origin'] = '*' headers['Access-Control-Request-Method'] = '*' end

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• Writing loops with i++ or ++i [duplicate]

  - by Nonesuch

  This question already has an answer here: Why use ++i instead of i++ in cases where the value is not used anywhere else in the statement? 6 answers format of for loops 31 answers I have a question about writing loops. I always begin with (int i=0; i<10; i++) But I see many experts begin with (int i=0; i<10; ++i) Is there there any real difference, or they are same? Of course, I know the difference between pre-increment and post-increment. I mean which one I should use when writing the loop? or it depends. Thanks!

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• Mercurial: Recommended way of sending a whole repository to someone

  - by Svish

  I have done some programming and I have used Mercurial for source control. I now need to send all of my code to someone else (because they are going to take over). Since all copies of a mercurial repository is a full and real repository my first thought is to first do a clone of my repository without an update and then zipping and emailing that clone. Is this a good way, or is there a better way? For example when using the TortoiseHg Repository Explorer I can right-click on a changeset and under Export there are various options that looks like they could be doing something interesting, but I don't quite understand them or know which one to use.

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• Ways to wrap 32-bit .dll so it will work in a 64-bit OS

  - by dcarlet101

  So, I've been using JPIB to communicate with GPIB devices in my java program. However, I have run into a snag. Newer systems are built on 64 bit OS's. However, the jpib.dll file is written in 32-bit. I can't think of any kind of calls that it would need to make that are truly 64-bit dependent. The real trouble here is that the JPIB project hasn't been updated since september of 2006. I've tried emailing the dev through SourceForge but I don't think I'll get anywhere with that. Does anyone know of any ways around this? Or know how (and could tell me how) to recompile the .dll into AMD-64 compliance?

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• iPhone Simulator:Just show Default img and finish the delegate method appDidFinishLaunching after quit iPhone Simulator and rebuild...

  - by David_iDev

  Hi all, After I quit simulator and click build the app from XCode, the iPhone Simulator loading and my app will be install and run. But the app just show only Default image (finish the applicationDidFinishLaunching method - I logs it) and do nothing. I can't do anything in Simulator, event click the "Home" button of Simulator. But the other time, when Simulator already running, I select the "Build" button in XCode and everything is fine. Can you tell me why and how does this issue effect my app when I build it with real device? Thanks a lot!

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• link_to syntax with rails3 (link_to_remote) and basic javascript not working in a rails3 app?

  - by z3cko

  i am wondering if the basic link_to syntax is completely broken in current rails3 master or if i am doing some wrong syntax here. = link_to "name", nil, :onlick => "alert('Hello world!');" should actually produce an alert on click. very simple. does not work on my rails3 project! (also no error output!) any ideas? for the general link_to syntax i could not find an example where i could combine a link_to_remote with a confirmation, remote and html class (see my try below) = link_to "delete", {:action => "destroy", :remote => true, :method => :delete, :confirm => "#{a.title} wirklich L&ouml;schen?" }, :class => "trash" even the rails3 api does not help me here: http://rails3api.s3.amazonaws.com/index.html help!

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• Why is rails called a dsl?

  - by b_ayan

  Recently, when I tried to explain why Rails is a DSL to an intern at my organisation, I was not able to articulate my reasonings to the effect I would like to. Maybe I do not understand the space well enough to teach the nuances. Redirecting him to Martin Fowler' article or the google ranked one InfoQ or other material has not helped much either. Can some explain why Rails is a DSL with an example / parallel situation which is not voodoo stuff for someone who is fairly new to the world of code? Understanding the ideology might also help in elaborating the intricacies of the rails ecosystem?

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• What scenarios/settings will result in a query on SQL Server (2008) return stale data

  - by s1mm0t

  Most applications rarely need to display 100% accurate data. For example if this stack overflow question displays that there have been 0 views, when there have really been 10, it doesn't really matter. This is one way that the (perceived) performance of applications can be improved, by caching results and therefore sometimes not showing 100% accurate results. There are some cases where the data does need to be 100% accurate though. So if I run the query select * from Foo I want to be sure that the results are not stale. Now depending on how my database is set up, other activity on the database, use of transactions and isolation levels etc this query may or may not be a true reflection of the world. What scenario's and settings can people think of that will result in this query returning stale results or given that another connection is part way through a transaction that has updated this table, how can I guarantee that when the above query returns, the results will be accurate.

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• When is a program limited by the memory bandwidth?

  - by hanno

  I want to know if a program that I am using and which requires a lot of memory is limited by the memory bandwidth. When do you expect this to happen? Did it ever happen to you in a real life scenario? I found several articles discussing this issue, including http://www.cs.virginia.edu/~mccalpin/papers/bandwidth/node12.html http://www.cs.virginia.edu/~mccalpin/papers/bandwidth/node13.html http://ispass.org/ucas5/session2_3_ibm.pdf The first link is a bit old, but suggests that you need to perform less than about 1-40 floating point operations per floating point variable in order to see this effect (correct me if I'm wrong). How can I measure the memory bandwidth that a given program is using and how do I measure the (peak) bandwidth that my system can offer? I don't want to discuss any complicated cache issues here. I'm only interested in the communication between the CPU and the memory.

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• Detecting video playing in browser from a screenshot -- OpenCV

  - by Jon

  I would like to draw a rectangle around a video playing on my screen. For example, I am watching a YouTube video in my browser. I would like to be able to take a screenshot, analyze that screenshot, and then draw a rectangle around where the YouTube video is playing. I have just started looking into how I might be able to to this. I came across OpenCV. I understand that OpenCV covers many computer vision techniques. Would any of them be particularly well suited for this task? Also, is this something that can be done in real time? Finally, is there a technique that would work for both in browser and full screen? Thanks!

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• does jQuery UI have a way to achieve this Flash button's functionality?

  - by Tim

  There's a button in Flash which looks something like a jQuery SplitButton. The Flash button consists of two parts, the text and the icon. [text portion] [v] I have used it to display string search operators for the user: equals, starts with, ends with, contains. In Flash, when the icon is clicked, the text-area drops down a list of choices; it would look like this: [ ] [v] equals starts with ends with contains And when the user makes a choice from the list, the choice is displayed in the text area of the button and the list rolls up. [ starts with ] [v] I'm trying to convert my Flash app and am hoping to come up with a counterpart to this functionality. For space considerations on the form, a radio-button-group would be less than ideal. That's the major virtue of this Flash button -- it's very economical in its use of screen real-estate. Thanks for any answers/suggestions.

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• php web based portal authentication through IP.

  - by user434885

  i have a web portal running which involves basic data entry. The issue being that this is highly sensitive data. And the credibility of the data entry personel is very low. Therefore i have implemented recording of IP when an entry is made. The Problem i am facing is if this if this person starts forwarding his IP from a proxy server then i am unable to track authenticity of the data. How do i detect if the IP forwarding is happening/ get the real ip address of the person.

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• building treeview

  - by DJPlayer

  I'm dynamically building a treeview given numerous stored procedures. the structure goes like this: OwnerRPColl.Search2() For Each root As OWNER_RP In OwnerRPColl Dim nd_Root As New TreeNode nd_Root = TreeView1.Nodes.Add(root.OWNER_RP_BUSNS_NAME) bldg.ID = root.ID bldgColl.Search(bldg.ID) For Each firstChild As BLDG In bldgColl Dim nd_lvl_One As New TreeNode With nd_lvl_One .Text = firstChild.BLDG_NAME_1 .Tag = firstChild.ID End With problem being is that I need to have labels for these.. meaning the first level of the treeview needs to say "users" when expanded displays users. Each of these users can have a building. The world building needs to be the example option, which then displays the building.. essentially I need a slick way to add the word in for the expanding level (instead of the value in the collection).

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• What is the best way for the application to refer to the user?

  - by user292450

  Forgive my noobishness, first time poster on stackoverflow! I can have the application read: "view your messages" "view my messages" "edit your profile" "edit my profile" etc. and others like that. Is one of these more correct then the other? I suppose that I could use neither and just leave it without any pronoun, but I would rather not. The person grading is a real stickler for "grammar" in code. Any input would be appreciated!

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• Can I get a patch-compatible output from git-diff?

  - by Malvolio

  I am doing something very simple wrong. I'm trying to prepare an ordinary patch file, so I can reapply some changes: $ git diff > before $ git diff something_here > save.patch $ git checkout . $ patch < save.patch $ git diff > after $ diff before after $ With something_here blank it almost works, but the file names aren't right. I think I'm just I'm missing some option. In real life, I am going to do a merge after the checkout, so the patch might fail there, but you see what I'm getting at.

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• How online-game clients are able to exchange data through internet so fast?

  - by Kirzilla

  Hello, Let's imagine really simple game... We have a labirinth and two players trying to find out exit in real time through internet. On every move game client should send player's coordinates to server and accept current coordinates of another client. How is it possible to make this exchange so fast (as all modern games do). Ok, we can use memcache or similar technology to reduce data mining operations on server side. We can also use fastest webserver etc., but we still will have problems with timings. So, the questions are... What protocol game clients are usually using for exchanging information with server? What server technologies are coming to solve this problem? What algorithms are applied for fighting with delays during game etc. PS: Sorry for my English and I hope that my question is clear. Thank you.

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• how to detect datacard connect and disconnect event on win32

  - by Vinayaka Karjigi

  Hi All, I have a data card, as soon as i insert the data card, i am getting the events by using wm_device_change event. But I also want to get event, when my data connect actually connects to out side world. I mean to say, as soon as we click on connect/disconnect button of data card,i want to get the event. exactly speaking wanted to know, when connection is established and disconnected. data card is vodaphone data card and i am trying to browse using that data card. what ever is the SDK, somewhere the OS should get the event of connection and disconnection to network is there any way to access that event which OS is getting. as i can see in notificaiton the changes of vodaphone connection and LAN connection data card is a USB device having SIM within it, and can be used to access internet through GPRS. can i know how to do this in win32 c/c++ programe. with regards Vinayaka Karjigi

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• How to process credit card by using intuit's (quickbook) ?

  - by Grace Ladder

  How to process credit card by using Hello all, I am doing shopping cart project for my client and one of the requirement is using intuit's (http://www.intuit.com/) product to process credit card in real manner, as the client is going to integrate the online shop with quickbook in later stage. My question is, does intuit products purely payment gateway solution? as in this stage, we are not involved with any dev work about quickbook, the main focus for us is deliver the high quality shopping cart solution, we read something about intuit's web shop solution but seems this one require quickbook running in desktop to sync the data? Very confused now, if anyone had experience before, please help!

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• Are Domain Specific Languages (DSL) bad for the Common Programmer?

  - by iestyn

  I have lately been delving into F# and the new DSL stuff as in the Microsoft SQL Server Modelling CTP, and have some concerns. Will this new idea that will come about be bad for skilled programmers? Is code going to be dumbed down? I know I sound like a luddite, but this does worry me, after spending years of time practising in my craft, and now might be scuttled by genius from within. I am afraid, very afraid. Will I be now trapped in a job that only programs against a DSL and therefore every job that I work on, I have to learn a whole new DSL based on top of a Framework (.net Java), that I will only be allowed to touch certain parts of. I don't think the world is ready for DSL, but the sales pitch is deafening!

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• What makes Groovy+Grails a more productive setup than J2EE?

  - by Pradyumna

  I'm coming across references to 'Grails' and 'Groovy' quite often these days.. mostly on how great a productivity booster it is as opposed to standard J2EE, or things like JSF, Struts etc.. And there's also an impressive set of case studies in support of this on their web site too. So I just thought I would explore some of it.. As I start off on this, I was curious if there was any material (link, blog, article, paper..) that explains what are the special features in Grails+Groovy (and not found elsewhere, in the J2EE world) that makes it a more productive environment to work in? Thanks!

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