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• setDelegate:self, how does it work?

  - by fuzzygoat

  I have a query regarding how delegates work. My understanding was that delegates take responsibility for doing certain tasks on behalf of another object. locationManager = [[CLLocationManager alloc] init]; [locationManager setDelegate:self]; [locationManager setDistanceFilter:kCLDistanceFilterNone]; [locationManager setDesiredAccuracy:kCLLocationAccuracyBest]; [locationManager startUpdatingLocation]; Am I right in thinking that in the example code above that the instance of CLLocationManager is created on a new thread so that it can get on with trying to find the location information it needs. When it completes its task (or encounters an error) it calls-back using the appropriate methods located in self e.g. locationManager:didUpdateToLocation:fromLocation: Essentially locationManager sends messages to self (which conforms to the correct delegate protocol) when things happen cheers gary

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• How to handle BL cache for multiple web applications?

  - by Eran Betzalel

  I recently received a project that contains multiple web applications with no MVC structure. For starters I've created a library (DLL) that will contain the main Business Logic. The problem is with Caching - If I use the current web context cache object than I might end up with duplicate caching (as the web context will be different for every application). I'm currently thinking about implementing a simple caching mechanism with a singleton pattern that will allow the different web sites (aka different application domains) to share their "caching wisdom". I'd like to know what is the best way to solve this problem.

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• Array Vs. Linked List

  - by Onorio Catenacci

  I apologize--this question may be a bit open-ended but I think there are probably definite, quantifiable answers to it so I'll post it anyway. A person I know is trying to learn C++ and software development (+1 to him) and he asked me why someone would want to use a linked list in preference to an array. Coding a linked list is, no doubt, a bit more work than using an array and he wondered what would justify the additional effort. I gave him the answer I know: insertion of new elements is trivial in linked list but it's a major chore in an array. But then I got to thinking about it a bit more. Besides the ease of insertion of a new element into a linked list are there other advantages to using a linked list to store a set of data vs. storing it in an array? As I said, I'm not meaning to start a long and drawn-out discussion. I'm just looking for other reasons that a developer might prefer a linked list to an array.

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• Complex String Processing - well complex to me

  - by percent20

  I am calling a web service and all I get back is a giant blob of text. I am left to process it myself. Problem is not all lines are necessarily the same. They each have 2 or 3 sections to them and they are similar. Here are the most common examples text1 [text2] /text3/ text1/test3 text1[text2]/text3 text1 [text2] /text /3 here/ I am not exactly sure how to approach this problem. I am not too good at doing anything advanced as far as manipulating strings. I was thinking using a regular expression might work, but not too sure on that either. If I can get each of these 3 sections broken up it is easier from there to do the rest. its just there doesn't seem to be any uniformity to the main 3 sections that I know how to work with.

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• C++ project type: unicode vs multi-byte; pros and cons

  - by Stefan Valianu

  I'm wondering what the Stack Overflow community thinks when it comes to creating a project (thinking primarily c++ here) with a unicode or a multi-byte character set. Are there pros to going Unicode straight from the start, implying all your strings will be in wide format? Are there performance issues / larger memory requirements because of a standard use of a larger character? Is there an advantage to this method? Do some processor architectures handle wide characters better? Are there any reasons to make your project Unicode if you don't plan on supporting additional languages? What reasons would one have for creating a project with a multi-byte character set? How do all of the factors above collide in a high performance environment (such as a modern video game) ?

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• Cross Platform build

  - by Neeraj

  I have an application in which we use a hand-made build system.The reason for this is portability, the application should be portable on Linux/Mac/Windows. There are some port-specific files that are not updated by the deafult build system. What I do now is update the files manually or have a script do this. However I am thinking of switching to cross platform build system like cmake or scons. Are their associated problems wrt portability? Will it pay in long run? and if so what should be my choice "cmake", "scons" or some other(if any?). Thanks,

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• Storing varchar(max) & varbinary(max) together - Problem?

  - by Tony Basallo

  I have an app that will have entries of both varchar(max) and varbinary(max) data types. I was considering putting these both in a separate table, together, even if only one of the two will be used at any given time. The question is whether storing them together has any impact on performance. Considering that they are stored in the heap, I'm thinking that having them together will not be a problem. However, the varchar(max) column will be probably have the text in row table option set. I couldn't find any performance testing or profiling while "googling bing," probably too specific a question? The SQL Server 2008 table looks like this: Id ParentId Version VersionDate StringContent - varchar(max) BinaryContent - varbinary(max) The app will decide which of the two columns to select for when the data is queried. The string column will much used much more frequently than the binary column - will this have any impact on performance?

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• recursive function to get all the child categories

  - by user253530

  Here is what I'm trying to do: - i need a function that when passed as an argument an ID (for a category of things) will provide all the subcategories and the sub-sub categories and sub-sub-sub..etc. - i was thinking to use a recursive function since i don't know the number of subcategories their sub-subcategories and so on so here is what i've tried to do so far function categoryChild($id) { $s = "SELECT * FROM PLD_CATEGORY WHERE PARENT_ID = $id"; $r = mysql_query($s); if(mysql_num_rows($r) > 0) { while($row = mysql_fetch_array($r)) echo $row['ID'].",".categoryChild($row['ID']); } else { $row = mysql_fetch_array($r); return $row['ID']; } } If i use return instead of echo, i won't get the same result. I need some help in order to fix this or rewrite it from scratch

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• How do you prevent brute force attacks on RESTful data services

  - by Adrian Grigore

  Hi, I'm about to implement an RESTful API to our website (based on WCF data services, but that probably does not matter). All data offered via this API belongs to certain users of my server, so I need to make sure only those users have access to my resources. For this reason, all requests have to be performed with a login/password combination as part of the request. What's the recommended approach for preventing brute force attacks in this scenario? I was thinking of logging failed requests denied due to wrong credentials and ignoring requests originating from the same IP after a certain threshold of failed requests has been exceeded. Is this the standard approach, or am I a missing something important? Thanks, Adrian

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• Current date in rails form

  - by Dean

  Hi, Im learning rails and exploring a bit away from the book and creating a simple application with added functionality as i increase my knowledge. Im writing a simple blog application and i have a field in the form called date added, i don't want this to be a field i want it to get the date from the server and place it in to the database automatically. How would i go about doing this? I was thinking of a hidden field but then unsure on how to process the date and insert it to the hidden field. Is this the wrong way of going about things? Thanks in Advance, Dean

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• Jersey, Apache HTTPD, and javax.annotation.security usage

  - by Nick Klauer

  So I'm having a heck of a time trying to piece together what I think is a pretty simple implementation. This is very similar to another StackOverflow question only I can't leverage Tomcat to handle role based authentication. I have an Apache httpd server in front of my app that handles authentication and then passes LDAP roles to a Jersey service through Headers. I've created a servlet filter to parse the header and tease out the roles the request came from, which works fine globally to the app, but isn't fine-grained enough to dictate what an Admin could do that a User could not. I'm thinking I could use the javax.annotation.security annotations that JAX-RS supports, but I don't know how to take what I've parsed out using a servlet filter to set or instantiate the SecurityContext necessary for the roles @RolesAllowed.

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• Need help making site available externally

  - by White Island

  I'm trying to open a hole in the firewall (ASA 5505, v8.2) to allow external access to a Web application. Via ASDM (6.3?), I've added the server as a Public Server, which creates a static NAT entry [I'm using the public IP that is assigned to 'dynamic NAT--outgoing' for the LAN, after confirming on the Cisco forums that it wouldn't bring everyone's access crashing down] and an incoming rule "any... public_ip... https... allow" but traffic is still not getting through. When I look at the log viewer, it says it's denied by access-group outside_access_in, implicit rule, which is "any any ip deny" I haven't had much experience with Cisco management. I can't see what I'm missing to allow this connection through, and I'm wondering if there's anything else special I have to add. I tried adding a rule (several variations) within that access-group to allow https to the server, but it never made a difference. Maybe I haven't found the right combination? :P I also made sure the Windows firewall is open on port 443, although I'm pretty sure the current problem is Cisco, because of the logs. :) Any ideas? If you need more information, please let me know. Thanks Edit: First of all, I had this backward. (Sorry) Traffic is being blocked by access-group "inside_access_out" which is what confused me in the first place. I guess I confused myself again in the midst of typing the question. Here, I believe, is the pertinent information. Please let me know what you see wrong. access-list acl_in extended permit tcp any host PUBLIC_IP eq https access-list acl_in extended permit icmp CS_WAN_IPs 255.255.255.240 any access-list acl_in remark Allow Vendor connections to LAN access-list acl_in extended permit tcp host Vendor any object-group RemoteDesktop access-list acl_in remark NetworkScanner scan-to-email incoming (from smtp.mail.microsoftonline.com to PCs) access-list acl_in extended permit object-group TCPUDP any object-group Scan-to-email host NetworkScanner object-group Scan-to-email access-list acl_out extended permit icmp any any access-list acl_out extended permit tcp any any access-list acl_out extended permit udp any any access-list SSLVPNSplitTunnel standard permit LAN_Subnet 255.255.255.0 access-list nonat extended permit ip VPN_Subnet 255.255.255.0 LAN_Subnet 255.255.255.0 access-list nonat extended permit ip LAN_Subnet 255.255.255.0 VPN_Subnet 255.255.255.0 access-list inside_access_out remark NetworkScanner Scan-to-email outgoing (from scanner to Internet) access-list inside_access_out extended permit object-group TCPUDP host NetworkScanner object-group Scan-to-email any object-group Scan-to-email access-list inside_access_out extended permit tcp any interface outside eq https static (inside,outside) PUBLIC_IP LOCAL_IP[server object] netmask 255.255.255.255 I wasn't sure if I needed to reverse that "static" entry, since I got my question mixed up... and also with that last access-list entry, I tried interface inside and outside - neither proved successful... and I wasn't sure about whether it should be www, since the site is running on https. I assumed it should only be https.

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• Question about WinForms TrackBar control in .Net

  - by Jules

  Does anyone know the millisecond interval, used by the framework trackbar, between calling the ValueChanged event when moving the grip with a mouse? I've implemented my own trackbar and I'd like the behaviour to be consistent with what the user expects. I've had a look in reflector but it's one of those controls where most of the implementation is not viewable. ETA: Actually, thinking about it, it's not as simple as that. For small changes, the TrackBar is raising the event for every change. However, if you make a large fast change with the grip, it will not raise the event for every step. Just wondering exactly how the framework does this? Thanks

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• Building a Universal iPad App - Where is the device recognition code?

  - by JustinXXVII

  I noticed that when I create a new project in XCode for a Universal iPad/iPhone application, the template comes with two separate App Delegate files, one for each device. I can't seem to locate the place in code where it tries to decide which app delegate to use. I have an existing iPhone project I'd like to port to iPad. My thinking was that if I went ahead and designed the iPad project, I could just import my iPhone classes and nibs, and then use the App Delegate and UIDevice to decide which MainWindow.xib to load. The process went like this: Create an iPad project coded as a split-view create brand new classes and nibs for the iPad import iPhone classes and nibs Change build/target settings in accordance with Universal Apps Use [[UIDevice currentDevice] model] in the AppDelegate to decide which MainWindow to load Will this work, or does the app just automatically know which device it's being deployed on? Thanks for any insight you can offer.

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• How do you match only valid roman numerals with a regular expression?

  - by Daniel Magliola

  Thinking about my other problem, i decided I can't even create a regular expression that will match roman numerals (let alone a context-free grammar that will generate them) The problem is matching only valid roman numerals. Eg, 990 is NOT "XM", it's "CMXC" My problem in making the regex for this is that in order to allow or not allow certain characters, I need to look back. Let's take thousands and hundreds, for example. I can allow M{0,2}C?M (to allow for 900, 1000, 1900, 2000, 2900 and 3000). However, If the match is on CM, I can't allow following characters to be C or D (because I'm already at 900). How can I express this in a regex? If it's simply not expressible in a regex, is it expressible in a context-free grammar? Thanks for any pointers!

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• Determining if a .NET type is dynamic (created using Reflection.Emit)

  - by Diego Mijelshon

  While the .NET 4 framework provides the Assembly.IsDynamic method, that's not the case with .NET 2.0/3.5. The use case is simple: for logging purposes, I want to determine the underlying type name of an entity that might be wrapped by a dynamic proxy without having any references to NHibernate or Castle (which know about the proxy) For example, I might have a CatProxYadaYada, but I'm interested in Cat. What's the easiest way to get that type? I was thinking of this skeleton: var type = obj.GetType(); while (IsProxy_Dynamic_Whatever(obj)) type = type.BaseType; return type;

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• Bash: how to interrupt this script when there's a CTRL-C?

  - by WizardOfOdds

  I wrote a tiny Bash script to find all the Mercurial changesets (starting from the tip) that contains the string passed in argument: #!/bin/bash CNT=$(hg tip | awk '{ print $2 }' | head -c 3) while [ $CNT -gt 0 ] do echo rev $CNT hg log -v -r$CNT | grep $1 let CNT=CNT-1 done If I interrupt it by hitting ctrl-c, more often than not the command currently executed is "hg log" and it's that command that gets interrupted, but then my script continues. I was then thinking of checking the return status of "hg log", but because I'm piping it into grep I'm not too sure as to how to go about it... How should I go about exiting this script when it is interrupted? (btw I don't know if that script is good at all for what I want to do but it does the job and anyway I'm interested in the "interrupted" issue)

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• Asynchronous email processing in Java web application

  - by Denise

  Hi everyone, I would like to implement asynchronous email sending in my web application when users register for a new account. This is so that if there is a problem or delay in sending the email message (e.g. the mail server is down or the network connection to the mail server is slow) the user won't be kept waiting for the sending to complete. My web app is built using Spring and Hibernate's implementation of JPA. What would be the best and most reliable way for me to implement asynchronous email processing in this web application? I am thinking about persisting the email information in a database table which is then regularly polled by a Quartz (http://www.opensymphony.com/quartz/) scheduled job for updates and when it finds new unsent emails, it attempts to send them. Is this a reasonable way of implementing what I want? Thanks.

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• Example of code generator you made from scratch?

  - by rosscj2533

  What are some examples of code generators you have used? I think it's a cool idea, but I have trouble thinking of things they can do besides make a class based on an object's attributes/database schema (as described in The Pragmatic Programmer). What language did you write them in and what language did they output? Edit: Thanks for the responses so far. What I am really looking for is examples of code generators made from scratch for some certain purpose. I mentioned it in the title, but didn't make it very clear in my question. How did you go about making a code generator on your own and what specificly did it achieve?

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• Sell digital goods online

  - by Adam

  What's the best solution for a photographer wanting to sell image files online? I tried zencart, but it's way over the top and their backend looks like a 3 year old designed it. Is there a free solution out there? One that has easily modifiable templates and isn't too tedious to add hundreds of pictures for sale? I'm seriously thinking learning how to do it myself with the whole paypal IPN thing might be the way to go.. Suggestions is greatly appreciated! Adam

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• Find/Replace but Increment Value

  - by KR Kahn

  Hello, I have an .HTML file that has many photos attached to it for displaying a photo gallery. I'm replacing old photos with new ones, and I'm thinking there must be a more intelligent way than simply copying and pasting repetitive file names. I would love to be able to replace and increment a file name on each replace, starting at a base file name of my choosing. For example... ...images/69thStreet010.jpg ...images/69thStreet011.jpg ...images/69thStreet012.jpg Basically performing a CTRL+F and REPLACE '69thStreet010.jpg' with... ...images/xyz001.jpg ...images/xyz002.jpg ...images/xyz003.jpg And so on until I want it to stop. Anyone here have any suggestions? Thanks a lot! -K.R. UPDATE: I should also add, I'm using Notepad++ to edit my files.

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• geo-indexing: efficiently calculating proximity based on latitude/longitude

  - by AnC

  My simple web app (WSGI, Python) supports text queries to find items in the database. Now I'd like to extend this to allow for queries like "find all items within 1 mile of {lat,long}". Of course that's a complex job if efficiency is a concern, so I'm thinking of a dedicated external module that does indexing for geo-coordinates - sort of like Lucene would for text. I assume a generic component like this already exists, but haven't been able to find anything so far. Any help would be greatly appreciated.

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• How Do I Intercept Banner in WordPress?

  - by Volomike

  My client wants me to make a plugin that intercepts the banner on a WordPress blog so that the existing one displays, but right beneath it, above the content and the sidebar, another banner appears. And he needs it such that it works in most themes and isn't theme-specific. I found I could use add_action('loop_start','interceptMe') to put something at the top before posts or a single post, but it still left the sidebar on the right. I have tried using add_action('all','test') to dump out different intercepts to see if I could figure this out, but I just can't seem to get it yet. I'm thinking I may have to intercept all esc_html calls and contextually inspect that until I find one used for the banner. Does anyone know how to intercept the banner to add another one right beneath it?

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• Is there a standard site structure format?

  - by artlung

  Is there a standard site structure format? The use of this would be for export and import into a CMS or framework to define the urls, content, metadata for a website. Something tool agnostic would be the goal. JSON, YAML, XML, whatever. Maybe something like: { 'baseurl': 'http://example.com', 'site': [ {'slug': '/', 'title': 'ExampleCo. Inc.'}, {'slug': '/about', 'title': 'About Our Company'}, {'slug': '/services', 'title': 'Our Services'}, {'slug': '/products', 'title': 'Products'}, {'slug': '/products/purchase', 'title': 'Purchase Products Now'}, {'slug': '/products/downloads', 'title': 'Downloads'}, {'slug': '/contact', 'title': 'Contact Us'} ] } My thinking is that it would allow you to quickly populate a content management system or framework with a generic site navigational structure. Does something like this exist?

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• In WPF how to define a Data template in case of enum?

  - by Ashish Ashu

  I have a Enum defined as Type public Enum Type { OneType, TwoType, ThreeType }; Now I bind Type to a drop down Ribbon Control Drop Down Menu in a Ribbon Control that displays each menu with a MenuName with corresponding Image. ( I am using Syncfusion Ribbon Control ). I want that each enum type like ( OneType ) has data template defined that has Name of the menu and corrospending image. How can I define the data template of enum ? Please suggest me the solution, if this is possible !! Please also tell me if its not possible or I am thinking in the wrong direction !!

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