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  • Java - how to tell class of an object?

    - by lkm
    Given a method that accepts as a parameter a certain supertype. Is there any way, within that method, to determine the actual class of the object that was passed to it? I.e. if a subtype of the allowable parameter was actually passed, is there a way to find out which type it is? If this isn't possible can someone explain why not (from a language design perspective)? Thanks Update: just to make sure I was clear void doSomething(MyType myType) { //determine if myType is MyType OR one of its subclasses } Since the method signature specifies the parameter as being MyType, then how can one tell if the object is actually a subtype of MyType (and which one).

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  • problem with opening link through safari with webview

    - by Desmond
    hi i had encounter a problem opening a web link through safari. this is my code header #import <UIKit/UIKit.h> @interface qrcode_info : UIViewController <UIWebViewDelegate,UIAlertViewDelegate> { } @property (nonatomic, retain) IBOutlet UIWebView *Web; @end //main file #import "qrcode_info.h" @implementation qrcode_info @synthesize Web; -(BOOL)Web:(UIWebView *)Web shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType { if (navigationType == UIWebViewNavigationTypeLinkClicked) { [[UIApplication sharedApplication] openURL:[request URL]]; return NO; } return YES; } //[[UIApplication sharedApplication] openURL:[inRequest URL]]; //return NO; - (void)viewDidLoad { [super viewDidLoad]; [Web loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"help" ofType:@"html"] isDirectory:NO]]]; //self.wvTutorial = [[WebViewController alloc] initWithNibName:@”WebView” bundle:[NSBundle mainBundle]]; }

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  • How to write applications that modifies the Windows UI?

    - by StevenGilligan
    Hi, I have this programming question that's been bothering me for some time now. I'm wondering how is it possible to write applications that change the Windows UI? More precisely how could you write an application that modifies the Windows Taskbar or the Windows Desktop? I'm really interested in this topic but cannot find a lot of information. I've read about extending the Windows Shell but I can't seem to find anything related to modifying the Taskbar and the Desktop. I'm looking for something along the lines of Rainmeter. How did those guys create an application that lives inside the Windows Desktop? I'd like to point out that my prefered language for this would be C# but if you want to give me hints in other languages I'm fine with it and I am running on Windows 7. Thank you

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  • ASP.NET auto submits form with only one textbox

    - by MartinHN
    Hi, look at this code: <%@ Page Language="C#" AutoEventWireup="true" CodeFile="test.aspx.cs" Inherits="test" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <input type="text" /> </form> </body> </html> When I hit the enter key, when the input box has focus - the form submits. If I add another input box it doesn't submit. How can I avoid the auto submit when there's only one input box?

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  • OpenGL Performance Questions

    - by Daniel
    This subject, as with any optimisation problem, gets hit on a lot, but I just couldn't find what I (think) I want. A lot of tutorials, and even SO questions have similar tips; generally covering: Use GL face culling (the OpenGL function, not the scene logic) Only send 1 matrix to the GPU (projectionModelView combination), therefore decreasing the MVP calculations from per vertex to once per model (as it should be). Use interleaved Vertices Minimize as many GL calls as possible, batch where appropriate And possibly a few/many others. I am (for curiosity reasons) rendering 28 million triangles in my application using several vertex buffers. I have tried all the above techniques (to the best of my knowledge), and received almost no performance change. Whilst I am receiving around 40FPS in my implementation, which is by no means problematic, I am still curious as to where these optimisation 'tips' actually come into use? My CPU is idling around 20-50% during rendering, therefore I assume I am GPU bound for increasing performance. Note: I am looking into gDEBugger at the moment Cross posted at Game Development

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  • Rails 3 respond_to: default format?

    - by bdorry
    I am converting a Rails 2 application to Rails 3. I currently have a controller set up like the following: class Api::RegionsController < ApplicationController respond_to :xml, :json end with and an action that looks like the following: def index @regions = Region.all respond_with @regions end The implementation is pretty straightforward, api/regions, api/regions.xml and api/regions.json all respond as you would expect. The problem is that I want api/regions by default to respond via XML. I have consumers that expect an XML response and I would hate to have them change all their URLs to include .xml unless absolutely necessary. In Rails 2 you would accomplish that by doing this: respond_to do |format| format.xml { render :xml => @region.to_xml } format.json { render :json => @region.to_json } end But in Rails 3 I cannot find a way to default it to an XML response. Any ideas?

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  • Methodologies or algorithms for filling in missing data

    - by tbone
    I am dealing with datasets with missing data and need to be able to fill forward, backward, and gaps. So, for example, if I have data from Jan 1, 2000 to Dec 31, 2010, and some days are missing, when a user requests a timespan that begins before, ends after, or encompasses the missing data points, I need to "fill in" these missing values. Is there a proper term to refer to this concept of filling in data? Imputation is one term, don't know if it is "the" term for it though. I presume there are multiple algorithms & methodologies for filling in missing data (use last measured, using median/average/moving average, etc between 2 known numbers, etc. Anyone know the proper term for this problem, any online resources on this topic, or ideally links to open source implementations of some algorithms (C# preferably, but any language would be useful)

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  • Parsing XML with jQuery

    - by Jamie
    I've used this: $(document).ready(function () { $.ajax({ type: "GET", url: "http://domain.com/languages.php", dataType: "xml", success: xmlParser }); }); function xmlParser(xml) { $('#load').fadeOut(); $(xml).find("result").each(function () { $(".main").append('' + $(this).find("language").text() + ''); $(".lang").fadeIn(1000); }); } I used a local XML file on my computer, it works fine, but when I change the URL to an website, it just keeps loading all the time... How do I get this to work?

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  • Change default Console I/O functions handle.

    - by b-gen-jack-o-neill
    Hello. Is it possible to somehow change standart I/O functions handle on Windows? Language preffered is C++. If I understand it right, by selecting console project, compiler just pre-allocate console for you, and operates all standart I/O functions to work with its handle. So, what I want to do is to let one Console app actually write into another app Console buffer. I though that I could get first´s Console handle, than pass it to second app by a file (I don´t know much about interprocess comunication, and this seems easy) and than somehow use for example prinf with the first app handle. Can this be done? I know how to get console handle, but I have no idea how to redirect printf to that handle. Its just study-purpose project to more understand of OS work behind this. I am interested in how printf knows what Console it is assiciated with.

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  • Why people are so afraid of using clone() (on collection and JDK classes) ?

    - by Bozho
    A number of times I've argued that using clone() isn't such a bad practice. Yes, I know the arguments. Bloch said it's bad. He indeed did, but he said that implementing clone() is bad. Using clone on the other hand, especially if it is implemented correctly by a trusted library, such as the JDK, is OK. Just yesterday I had a discussion about an answer of mine that merely suggests that using clone() for ArrayList is OK (and got no upvotes for that reason, I guess). If we look at the @author of ArrayList, we can see a familiar name - Josh Bloch. So clone() on ArrayList (and other collections) is perfectly fine. (Just look at the implementation). Same goes for Calendar and perhaps most of the java.lang and java.util classes. So, give me a reason why not to use clone() with JDK classes?

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  • What's a good way to detect wrap-around in a fixed-width message counter?

    - by Kristo
    I'm writing a client application to communicate with a server program via UDP. The client periodically makes requests for data and needs to use the most recent server response. The request message has a 16-bit unsigned counter field that is echoed by the server so I can pair requests with server responses. Since it's UDP, I have to handle the case where server responses arrive out of order (or don't arrive at all). Naively, that means holding on to the highest message counter seen so far and dropping any incoming message with a lower number. But that will fail as soon as we pass 65535 messages and the counter wraps back to zero. Is there a good way to detect (with reasonable probability) that, for example, message 5 actually comes after message 65,000? The implementation language is C++.

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  • Problem with compiler in Web.Config for generating xml doc

    - by asksuperuser
    I have several problems when putting code below in Web.Config to be able to generate xml doc with website (not webproject): <compiler language="c#;cs;csharp" extension=".cs" warningLevel="0" type="Microsoft.CSharp.CSharpCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" compilerOptions="/doc:c:\doc\WebDocs.xml"> How do I put a directory with spaces instead of /doc:c:\doc\WebDocs.xml? How do I put a directory that is a subdirectory of current project? Why my xml file output is nearly empty? Is it because some properties, methods, ... have no xml comment?

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  • Single static HTML file: how can I serve it efficiently?

    - by Stevo M.
    Good afternoon. I have a domain and server that I've procured for non-HTML services. Should anyone stumble across port 80 of this server, I'd like to serve them a page explaining what the domain & server is for, instead of just 404'ing them. How can I serve one small, static, independent (i.e.: no images or CSS) HTML file, with a minimum of effort (meaning both a smooth setup for me, and minimum CPU expense). The server contains an untouched installation of ArchLinux, and I'm open to solutions in any language. (Note: I am a slight newbie when it comes to this, so forgive me if this question seems trivial or obvious.) Thank you.

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  • drawImage in Java applet flickers in Safari

    - by lcvinny
    I'm having a flicker problem in a Java applet in Safari (Mac). However, it's not the usual double buffering problem. I have isolated it down to one single drawImage call (no redundant repaint, no clear is called), which gives a white flicker before painting the image but not on every repaint. In fact, I measured the duration of the drawImage call, which is normally about 1ms, but up to 30ms about every 5th time paint is called, which is when it flickers. Repaints are triggered when I drag a component or when the window is scrolled. Is this a bug in the java implementation on OSX, and is there a fix for it?

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  • How do I delete all tables in a database using SqlCommand?

    - by mafutrct
    Unlike the other posts about the task "delete all tables", this question is specifically about using SqlCommand to access the database. A coworker is facing the problem that no matter how it attempts it, he can't delete all tables from a database via SqlCommand. He states that he can't perform such action as long as there is an active connection - the connection by the SqlCommand itself. I believe this should be possible and easy, but I don't have much of a clue about databases so I came here to ask. It would be awesome if you could provide a short code example in C# (or any .NET language, for that matter). If you require additional information, just leave a comment.

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  • When does innovative software development shows?

    - by den-javamaniac
    I've been working as a software developer for almost a year (not much though) in a corporate environment but all I've done so far is a raw software implementation of company needs. Senior coworkers don't seem to be doing some fairly different stuff. In fact their "benefit" for being experienced is simply an app design and getting their hands on new projects first. My elder software developer friend's jobs don't seem to differ from the overall picture. Currently I'm a student of a CS department and what I really want to bring in this world is some innovative(not new but innovative) stuff that haven't been there. Something as great as google wave or JARVIS (if that can be done at all) or even much better, but yet it looked like that's not possible. The question is: when do people in a corporate environment choose to create something innovative? (from your experience/thoughts)

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  • How can a web developer learn to develop for the iPhone?

    - by Jared Christensen
    I'm a web developer and I'm getting envious of all the cool iPhone apps. I know nothing about C or what ever language they use to make iPhone apps. I really have no idea where to start. What do I need to do? Should I take a class, buy a book? I have a pretty good grasp on programing, I do tons of HTML, CSS and Javascript development and some PHP and Action Scripting. I'm not very good with Object Oriented Programing but I think I could pick it up if I used it more. I love video tutorials like lynda.com or net.tutsplus.com. I learn best buy jumping in and getting my hands dirty.

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  • What webservers have support for HTML5 WebSocket?

    - by Jonas
    I would like to experiment with HTML5 WebSockets, and I am looking for a mature webserver with support for websockets. Is there a list of webservers that support websockets? What popular webservers has support for websockets? The server programming language doesn't matter, I know, Java, PHP, Erlang, Python and more... Just want to do some small experiments. I have looked at a few that doesn't support websockets (yet), i.e. Nginx, Apache and Mochiweb.

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  • UI fonts and languages

    - by Kai Sellgren
    I am developing a multilingual web application that has a nice looking UI. I thought using CSS 3's font-face property to make it even nicer UI, but I'm not really sure if that's a good idea. According to some people I have talked to, different languages need different fonts. This means that there is no single font that can display characters of all languages, because the same character may look different across languages. For example, according to Wikipedia, the Unicode code point U+4EE4 looks different in Korean and Japanese languages. So my question is, would it make most sense to contain the fonts within the language packs -- or within the themes of my UI?

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  • what is value of x for load and store

    - by Kevinniceguy
    This is some challenge On a single processor system, in which load and store are assumed to be atomic, what are all the possible values for x after both threads have completed in the following execution, assuming that x is initialised to O? Hint: you need to consider how this code might be compiled into machine language. for (int i = 0; i < 5; i++) : x = x + 1; for (int j = 0; j < 5; j++) : x = x + 1;

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  • I cannot get this Jquery Image ComboBox to Work

    - by WillingLearner
    Im trying to use this plugin: http://www.marghoobsuleman.com/jquery-image-dropdown I cannot get it to work in my file. I copied and pasted the code from the example files and made the necessary links to the js and css files just to test, and i still cant get it to work. Everytime i run it, i get this error: Error: Result of expression '$(".mydds").msDropDown' [undefined] is not a function The script im using to run the file is: <script language="javascript" type="text/javascript"> function showvalue(arg) { alert(arg); //arg.visible(false); } $(document).ready(function() { try { oHandler = $(".mydds").msDropDown().data("dd"); oHandler.visible(true); //alert($.msDropDown.version); //$.msDropDown.create("body select"); $("#ver").html($.msDropDown.version); } catch(e) { alert("Error: "+e.message); } }) </script> Why am I getting these errors and how can I fix it?

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  • How To Discover RSS Feeds for a given site.

    - by ktolis
    The quest is, given a site url (say http://stackoverflow.com/ ) to return the list of all the feeds available on the site. Methods acceptable: a) use a 3rd party service (google?, yahoo?, ...) programmatically b) using a crawler/spider (and some tips on how to configure the spider to return the rss/xml feeds only) c) programmatically using c/c++/php (any language/library) The task here is not to get the feeds contained on the page returned by the url but ALL the feeds that are available on the server at any depth... in any cases please provide a simple usage example.

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  • get url:xml why external url does not work

    - by Kazim Cubbali
    I am trying to grab information from an external xml with the following code. It only worked when I uploaded same file to my servers. Why cant I grab information from an external url? <script language="javascript"> // This script uses jQuery to retrieve the news XML file and display the contents $(document).ready(function(){ $.ajax({ type: "GET", url: "www.simplyprofound.com/samples/xml_jquery/sample.xml", dataType: "xml", success: function(xml) { $(xml).find('item').each(function(){ var title = $(this).find('title').text(); var source = $(this).find('source').text(); var description = $(this).find('description').text(); $('<div class="news_title"></div>').html(title).appendTo('#news_wrap'); $('<div class="news_source"></div>').html(source).appendTo('#news_wrap'); $('<div class="news_description"></div>').html(description).appendTo('#news_wrap'); }); } }); }); </script>

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  • Why should I use MVVM when it breaks built in functionality

    - by Jakob
    I'm struggling to grasp why MVVM is really a good pattern to implement in riaserivces, To me there's nothing but trouble to it, it just add's another tier that I have to code. I Get that I could change the UI, but really I don't need to. Instead i won't be able to user out of the box functionality with riaservices, datagrid, dataform all controls require some implementation. Why can't it just be simple? Is there really no way to get MVVM to automatically set "IsBusy" and all the dataform edit functionality. It's like reinventing the wheel to me, and it seems that I'd be able to write code much faster just using riaservices

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