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Articles indexed Tuesday April 27 2010

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• Using Remote Web Page to Initialize iPhone App

  - by Chris_K

  My iPhone app relies on a vendor's XML feed to provide data. But that feed is not locked down. The vendor could change the format of the XML at any time, although so far they've promised not to. Since I might want to tell my app to use a different URL for its data source, I'd like to set up a single "Command Central" Web page, on my own server, to direct the app to the correct data source. In other words, each time my app starts, in the background and unseen by the user, it would visit "http://www.myserver.com/iphoneapp_data_sources.xml" to retrieve the URL for retrieving data from my vendor. That way, if my vendor suddenly changes the exact URL or the XML feed that the app needs, I can update that Web page and ensure that all installations of the app are using the correct XML feed. Does anyone have any advice or examples showing this kind of approach? It seems as if this must be a common problem, but so far I haven't found a well-established design pattern that fits it.

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• How to redirect by throwing an exceptions from an Asp.NET controller?

  - by ripper234

  My controllers all extend a basic UserAwareController class, that exposes GetCurrentUser() method. I would like any call to this method to redirect to the login page if the user is not already logged in. Can I accomplish this by throwing some exception from this method? How can I cause a redirect to happen when this exception is thrown?

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• how to setup the sphinx with netbeans

  - by Pradeep

  i have successfully configured sphinx4 with eclipse. for that these steps i have used. copy my java and config files to SRC folder all the necessary jar files (in the lib). the lib folder added to the root of the project build those jar files (jsapi files too) change the configuration file and give the proper path test the java file but in Netbeans i really dont understand how to do the proper steps. can someone help me. the jar files should be added to "Libraries" rite. then after adding them how to build them. in the netbeans it dont show a SRC folder. so all the java files and configuration files should go to Source Packages folder rite. can someone help me with this. please

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• Building 16 bit os - character array not working

  - by brainbarshan

  Hi. I am building a 16 bit operating system. But character array does not seem to work. Here is my example kernel code: asm(".code16gcc\n"); void putchar(char); int main() { char *str = "hello"; putchar('A'); if(str[0]== 'h') putchar('h'); return 0; } void putchar(char val) { asm("movb %0, %%al\n" "movb $0x0E, %%ah\n" "int $0x10\n" : :"m"(val) ) ; } It prints: A that means putchar function is working properly but if(str[0]== 'h') putchar('h'); is not working. I am compiling it by: gcc -fno-toplevel-reorder -nostdinc -fno-builtin -I./include -c -o ./bin/kernel.o ./source/kernel.c ld -Ttext=0x9000 -o ./bin/kernel.bin ./bin/kernel.o -e 0x0 What should I do?

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• Atlanta GTUG Meeting Tonight

  If you're in the Atlanta, GA area and interested in Google technologies, you should come down/over/up to the Google Midtown office for tonight's GTUG meeting. The first meeting...

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• Setting up dnsmasq for a local network

  - by WishCow

  Me, and a small group of developers have just moved to a new office, and I'd like to set up dnsmasq on our development server, so when we deploy web apps there, we don't have to edit our own hosts files. We have a router at 192.168.3.1 which we don't have access to. I figured I'd install a DNS server on the development box, and we all record it's IP as a secondary DNS server. Unfortunately I'm strugling to make this work. The name of the devel server is devbox, it's IP is 192.168.3.99, and it's running the latest Ubuntu Server (Karmic) My computer is running Ubuntu Desktop (Karmic) What I'd like to achieve Let's say I have three websites, website1, website2, website3, running on the development box. I'd like to access them by the urls: http://website1.devbox http://website2.devbox http://website3.devbox So I have configured Apache on the devel box, installed dnsmasq, and put the following lines into it's hosts file: 192.168.3.99 website1.devbox 192.168.3.99 website2.devbox 192.168.3.99 website3.devbox and edited my own resolv.conf file to include the devel box as a nameserver: nameserver 192.168.3.99 It's working fine, I can access the sites. The problem is that it doesn't scale well. I'd like all the domains ending with .devbox forwarded to the development box, and this is what I'm struggling with. I have tried putting 192.168.3.99 devbox into the hosts file, and editing the line in dnsmasq.conf: # Add local-only domains here, queries in these domains are answered # from /etc/hosts or DHCP only. local=/devbox/ But I cannot get it working. If I try any url that is not explicitly present in the development box's hosts file, the dns lookup fails. Is the local directive for something else? Am I looking at the wrong place?

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• How do you prevent spam being sent by your users?

  - by Ernie

  So, for the third time in about two weeks (maybe less), one of our customers has had their password compromised, and a spammer was sending mail with their account using our webmail. As a result, our outgoing mail server has been listed at Spamhaus, and a lot of our outgoing mail is being rejected. I can't think of any way to prevent this from happening (although now our webmail server is using Sendmail instead of SMTP, but that just limits the scope of the problem), yet the big ISPs never seem to have a problem like this.

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• NetBios Name Service requests

  - by Austin Salonen

  I'm noticing on MS Network Monitor a ton of NetBios Name Service broadcasts coming from a particular workstation. When I run netmon on that desktop it cannot resolve the application producing them (but does log them). First question, is this bad? Next question, what could be causing this so we can either move it to a server or stop it entirely?

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• Windows Identity Foundation in SharePoint 2007

  - by rsteckly

  Hi, I've been reading about SharePoint 2010's Claims based authentication support. At this point, my shop has several clients who may not upgrade for a while, however. In making our other services claims compatible, we're wondering if claims based authentication is realistic without a great deal of reworking of existing code in our 2007 installations?

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• Is JSON.stringify() reliable for serializing JSON objects?

  - by Colin

  I need to send full objects from Javascript to PHP. It seemed pretty obvious to do JSON.stringify() and then json_decode() on the PHP end, but will this allow for strings with ":" and ","? Do I need to run an escape() function on big user input strings that may cause an issue? What would that escape function be? I don't think escape works for my purposes. Are there any downsides to JSON.stringify() I need to know about? Thanks

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• real polymorphism

  - by mazhar

  What really is polymorphism? please give example

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• Graph Algorithm To Find All Paths Between N Arbitrary Vertices

  - by russtbarnacle

  I have an graph with the following attributes: Undirected Not weighted Each vertex has a minimum of 2 and maximum of 6 edges connected to it. Vertex count will be < 100 I'm looking for paths between a random subset of the vertices (at least 2). The paths should simple paths that only go through any vertex once. My end goal is to have a set of routes so that you can start at one of the subset vertices and reach any of the other subset vertices. Its not necessary to pass through all the subset nodes when following a route. All of the algorithms I've found (Dijkstra,Depth first search etc.) seem to be dealing with paths between two vertices and shortest paths. Is there a known algorithm that will give me all the paths (I suppose these are subgraphs) that connect these subset of vertices?

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• How do I find the location of Python module sources?

  - by Daryl Spitzer

  How do I learn where the source file for a given Python module is installed? (Is the method is different on Windows than Linux?) (I want to look at the datetime module sources, but I thought I'd ask a more general question.)

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• C# Create Values in Registry Local Machine

  - by Shahmir Javaid

  This is not working for me: public bool createRegistry() { if (!registryExists()) { Microsoft.Win32.Registry.LocalMachine.CreateSubKey("Software\\xelo\\"); Microsoft.Win32.Registry.LocalMachine.OpenSubKey("Software\\xelo").SetValue("hostname", (string)hostname, Microsoft.Win32.RegistryValueKind.String); return true; } else { return updateRegistry(); } } The exception error is to do with Not Authorized to do this. Any Help would be apreaciated Exeption: System.UnauthorizedAccessException | "Cannot write to the registry key"

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• Is something better than firebug in IE 8 Developer toolbar?

  - by metal-gear-solid

  Is something better than firebug in IE 8 Developer toolbar? How to use IE 8 Developer toolbar in a way like we use firebug in firefox.? Is there any good tutorial on "how to take good use of IE 8 Developer toolbar"?

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• Wordpress: Check if there are previous posts before displaying link

  - by Chris Armstrong

  I'm using the following code to display a 'previous posts' link on my Wordpress blog. <nav> <ul> <li><?php previous_posts_link('Newer Entries &raquo;') ?></li> </ul </nav> Problem is, when there ARN'T any previous posts, while the link doesn't display, I still get <nav> <ul> <li><</li> </ul </nav> Printed out. Is there an if() statement I could wrap around it all so it checks if there are any previous posts, and only prints it out if there are?

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• Why is recordset result being returned in this way for Python database query?

  - by Scott

  I have searched high and low for an answer to why query results returned in this format and how to convert to a list. data = cursor.fetchall() When I print data, it results in: (('car',), ('boat',), ('plane',), ('truck',)) I want to have the results in a list as ["car", "boat", "plane", "truck"]

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• What is a great resource for learning about the implementation details of .NET generic collections?

  - by Jimmy W

  Hi all, I'm interested in understanding the underlying implementation details of generic collections in .NET. What I have in mind are details such as how the collections are stored, how each member of a collection is accessed by the CLR, etc. For collections that are analogous to traditional data structures, such as LinkedList and Dictionary, I think I have an understanding of what's going on underneath. However, I'm not as certain about collections like List (how is set up such that it is both indexable and expandable?) and SortedList, so any leads as to what I could look up to learn more about them would be greatly appreciated.

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• Replace all & that are not a HTML entity using C#

  - by Eddie

  Basically a dup of this question using php, but I need it for C#. I need to be able to replace any & that is not currently not any HTML entity (e.g. &amp;) before outputting to screen. I was thinking a regex, but I'm not sure if .Net has something built in that will do this.

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• Transparent checkbox with theme-support?

  - by Steve

  I'm looking for a simple, transparent checkbox component that properly supports XP/Vista/7 theming. It should also work with Delphi 7. I've found a component on Torry's that's not working properly, and I know that Raize components has a transparent checkbox - but I'm obviously not going to pay $300 for the entire package just to get this single component. I've also found many other solutions, but none of them support theming. The main problem is that TCustomCheckBox is a TWinControl descendant, and in order to implement transparency, you need to make a new TGraphic descendant control from ground up. Any ideas?

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• What are the video formats supported by MPMoviePlayerController on the iPad?

  - by Mike

  When you use iTunes to sync your videos with the iPhone the videos are always saved with no more than 640 pixels wide, if I am not wrong. What about the iPad? What is the size of videos iTunes syncs with iPad? 1024x768? and what if the video has a dimension below 1024x768? Will it scale up? or will it keep the video at low res and scale when you play? The question is because I am using the MPMoviePlayerController and I need to know what resolutions to expect, so I can adjust the interface. thanks.

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• Synchronization of threads slows down a multithreaded application

  - by Dimitri

  Hello, I have a multithreaded application written in c#. What i noticed is that implementing thread synchronization with lock(this) method slows down the application by 20%. Is that an expected behavior or should i look into the implementation closer?

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• Internet Explorer 6 and 7: floated elements expand to 100% width when they contain a child element f

  - by Paul D. Waite

  I've got a parent div floated left, with two child divs that I need to float right. The parent div should (if I understand the spec correctly) be as wide as needed to contain the child divs, and this is how it behaves in Firefox et al. In IE, the parent div expands to 100% width. This seems to be an issue with floated elements that have children floated right. Test page: <!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" lang="en" xml:lang="en"> <head> <title>Float test</title> </head> <body> <div style="border-top:solid 10px #0c0;float:left;"> <div style="border-top:solid 10px #00c;float:right;">Tester 1</div> <div style="border-top:solid 10px #c0c;float:right;">Tester 2</div> </div> </body> </html> Unfortunately I can't fix the width of the child divs, so I can't set a fixed width on the parent. Is there a CSS-only workaround to make the parent div as wide as the child divs?

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• check status application pool iis7 with csharp (access-denied)

  - by jack

  I need to monitor the status of an application in the applications pool of IIS 7 from an other machine on the same domain. My monitoring application must be in C# and running as a Windows service. On my server, I create a user with administration rights and I execute the command aspnet_regiis -ga machine\username wich worked succesfully. My problem is when I try to access the application pool i still get COMExcepttion "Access denied". What did i do wrong or wich step did i miss? I used code from http://patelshailesh.com/index.php/create-a-website-application-pool-programmatically-using-csharp as example. int status = 0; string ipAddress = "10.20.2.13"; string username = "username"; string password = "password"; try { DirectoryEntry de = new DirectoryEntry(string.Format("IIS://{0}/W3SVC/AppPools/MyAppPoolName", ipAddress), username, password); //the exception is thron here. status = (int)de.InvokeGet("AppPoolState"); switch (status) { case 2: //Runnig break; case 4: //Stopped break; default: break; } } catch (Exception ex) { }

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• python: list manipulation

  - by Jason S

  I have a list L of objects (for what it's worth this is in scons). I would like to create two lists L1 and L2 where L1 is L with an item I1 appended, and L2 is L with an item I2 appended. I would use append but that modifies the original list. How can I do this in Python? (sorry for the beginner question, I don't use the language much, just for scons)

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