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• Getting redefinition of View Controller pickerView:titleForRow:forComponent error

  - by pdenlinger

  Hi-- I'm working my way through the book Head First iPhone Development (O'Reilly). Am having trouble on page 68 with the following method and function; I get the error "redefinition of ViewController pickerView:titleForRow:forComponent error. Have checked the code for spaces; seems to be OK. Can you check the code and tell me what's wrong? Thank you. -(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent: (NSInteger)component{ switch (component) { case 0: return [activities objectAtIndex:row]; case 1: return [feelings objectAtIndex:row]; } return nil; }

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• Composite pattern in C++ problem

  - by annouk

  Hello! I have to work with an application in C++ similar to a phone book: the class Agenda with an STL list of Contacts.Regarding the contacts hierarchy,there is a base-class named Contact(an abstract one),and the derived classes Friend and Acquaintance(the types of contact). These classes have,for instance, a virtual method called getName,which returns the name of the contact. Now I must implement the Composite pattern by adding another type of contact,Company(being derived from Contact),which also contains a collection of Contacts(an STL list as well),that can be either of the "leaf" type(Friends or Acquaintances),or they can be Companies as well. Therefore,Company is the Compound type. The question is: how and where can I implement an STL find_if to search the contact with a given name(via getName function or suggest me smth else) both among the "leaf"-type Contact and inside the Company collection? In other words,how do I traverse the tree in order to find possible matches there too,using an uniform function definition? I hope I was pretty clear...

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• Converting a company from SVN to Hg?

  - by Michael

  We're a heavy user of SVN here. While the advantages of GIT over SVN made us want to change, the advantages of Hg over SVN mean it's now time to change and we need to start doing so very soon. I'm not so worried on the client side, but here are my questions. There are some excellent books on setting file metaproperties, properly organizing projects, etc on SVN. What is that book(s) for Hg? Is there a way to convert an SVN repository (that you've used) and can report how well it went? We don't want to lose years of commit logs if possible. When you DO convert, how did you split up the old code? Did you commit trunk as one project, and tags/forks as another? If you used SVN for legacy work, did you check in updates to SVN or something else?

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• Strings - Filling In Leading Zeros Wtih A Zero

  - by headscratch

  I'm reading an array of hard-coded strings of numeric characters - all positions are filled with a character, even for the leading zeros. Thus, can confidently parse it using substring(start, end) to convert to numeric. Example: "0123 0456 0789" However, a string coming from a database does not fill in the leading zero with a 'zero character', it simply fetches the '123 456 789', which is correct for an arithmetic number but not for my needs and makes for parsing trouble. Before writing conditionals to check for leading zeros and adding them to the string if needed, is there a simple way of specifying they be filled with a character ? I'm not finding this in my Java book... I could have done the three conditionals in the time it took to post this but, this is more about 'education'... Thanks

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• alternative to lag SQL command

  - by mahen

  I have a table which has a table like this. Month-----Book_Type-----sold_in_Dollars Jan----------A------------ 100 Jan----------B------------ 120 Feb----------A------------ 50 Mar----------A------------ 60 Mar----------B------------ 30 and so on I have to calculate the expected sales for each month and book type based on the last 2 months sales. So for March and type A it would be (100+50)/2 = 75 For March and type B it is 120/1 since no data for Feb is there. I was trying to use the lag function but it wouldn't work since there is data missing in a few rows. Any ideas on this?

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• Learn C++ after learning C#

  - by RichK

  I'm developing a library in C# at the moment and recently bought a great book to help me out but the code snippets are in C++. Does anyone have a link to a site/PDF that'll give me a crash course in C++? (mainly the syntax rather than pros/cons etc) because I'll be developing in C# but things like -, ::, &, **, are giving me the shivers. Obviously the languages aren't 100% compatible but if I know what the C++ is doing from a 'theoretical' point of view I can make a stab at rewriting it in C#. I've had a Google to find the answer but all the sites seem to be "Should I use C++ or C#?", which isn't any good to me. Thanks in advance.

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• How to correctly configure server for Symfony (on shared hosting)?

  - by Eugene

  Hi! I've decided to learn Symfony and right now I am reading through the very start of the "Practical Symfony" book. After reading the "Web Server Configuration" part I have a question. The manual is describing how to correctly configure the server: browser should have access only to web/ and sf/.../ directories. The manual has great instructions regarding this and being a Linux user I had no problem following them and making everything work on my local machine. However that involves editing VirtualHost entries which normally is not easy to do on common shared hosting servers. So I wonder what is the common technique that Symfony developers use to get the same results in shared hosting environment? I think I can do that by adding "deny from all" in the root and then overwriting that rule in the allowed directories. However I am not sure if that's the easiest way and the way that is normally used.

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• Why are Objective-C instance variables declared in an interface?

  - by Chase

  I'm just getting into Objective-C (Java is my primary OO language). Defining an object's instance variables in the interface instead of the class seems strange. I'm used to an interface being a public API definition with nothing besides method signatures (not counting constants here). Is there some reason that state is defined in an interface (even if it is private) and behaviour is defined in a class. It just seems odd that since objects are state+behavior that the definition would be split into two separate places. Is it a design benefit is some way? A pain in the rear issue that you are just forced to deal with in Objective-C? A non-issue, just different? Any background on why it's done this way? Or can you put object state in a class and I just haven't hit that part in my book yet?

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• TFS Check-in Unavailable

  - by pm_2

  I have a C# project that is booked into TFS. However, for some reason one of the forms within the project has not booked in. I can’t work out how to force this to book in, as right-clicking on the source file doesn’t give me the option to check-in. All the other files in the project are booked in, and I can see them using the Source Control Explorer, however, this file isn’t in there. Can anyone tell me how this could have happened, and how to force this file to check-in?

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• Java - Can i have a faster performance for this loop ?

  - by Brad

  I am reading a book and deleting a number of words from it. My problem is that the process takes long time, and i want to make its performance better(Less time), example : Vector<String> pages = new Vector<String>(); // Contains about 1500 page, each page has about 1000 words. Vector<String> wordsToDelete = new Vector<String>(); // Contains about 50000 words. for( String page: pages ) { String pageInLowCase = page.toLowerCase(); for( String wordToDelete: wordsToDelete ) { if( pageInLowCase.contains( wordToDelete ) ) page = page.replaceAll( "(?i)\\b" + wordToDelete + "\\b" , "" ); } // Do some staff with the final page that does not take much time. } This code takes around 3 minutes to execute. If i skipped the loop of replaceAll(...) i can save more than 2 minutes. So is there a way to do the same loop with a faster performance ?

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• Need help with some complex SQL query

  - by Psyche

  Hello guys, I need some help with a complex SQL query. Here's my setup: there are two tables, one with authors, and another with books. The books table contains a field named "author" which holds author's id. If a book has more than one author, then the "author" field will contain all the authors ids separated by ";" (something like 2;34;234). On the website I have to list all the books written by an author. If there's only one author, its simple, but how can I get those books where the author I'm interested in is the second or third author? Many thanks.

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• Skipping authorization for certain methods

  - by mathee

  Per the Agile Development book, I have an Admin MVC that controls how users log in. In ApplicationController, I have a before_filter that checks for authorization. So, this will check that the user has logged in for every page. The problem is that I want everyone to be able to access the new method, for example, in Users (that is, anyone should be able to create a new user -- naturally! Only admin users should have access to the other methods in UsersController such as edit, etc.). What's the best way to do that?

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• C++ Arrays of Structure access

  - by learningtolive

  Hi, I'm studying C++ from Schildt's book and don't quite understand what does he mean under third structure; Can somebody explain this - To access a specific structure within an array of structures, you must index the structure name. For example, to display the on_hand member of the third structure, you would write cout cout << invtry[2].on_hand; Some code: struct type{ char item[40]; double cost; double retail; int on_hand; int lead_time; }invtry[SIZE];

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• What does the R function `poly` really do?

  - by merlin2011

  I have read through the manual page ?poly (which I admit I did not completely comphrehend) and also read the description of the function in book Introduction to Statistical Learning. My current understanding is that a call to poly(horsepower, 2) should be equivalent to writing horsepower + I(horsepower^2). However, this seems to be contradicted by the output of the following code. library(ISLR) summary(lm(mpg~poly(horsepower,2), data=Auto))$coef summary(lm(mpg~horsepower+I(horsepower^2), data=Auto))$coef Output: Estimate Std. Error t value Pr(>|t|) (Intercept) 23.44592 0.2209163 106.13030 2.752212e-289 poly(horsepower, 2)1 -120.13774 4.3739206 -27.46683 4.169400e-93 poly(horsepower, 2)2 44.08953 4.3739206 10.08009 2.196340e-21 Estimate Std. Error t value Pr(>|t|) (Intercept) 56.900099702 1.8004268063 31.60367 1.740911e-109 horsepower -0.466189630 0.0311246171 -14.97816 2.289429e-40 I(horsepower^2) 0.001230536 0.0001220759 10.08009 2.196340e-21 My question is, why does the output not match, and what is poly really doing?

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• What books should be read to become an excelent software architect.

  - by dev-cu

  I know there are good books to start with, but let's make a short list of 3-5 books, i don't think only one book could help you in the way of becoming a good architect. I read some time ago that an architect takes years to have the knowledge and the ability to make good decisions. Suppose someone has the potential, what is the way? Please, answers with books that doesn't repeat over the same theme, making your learning process widely. One short list per answer. Vote up that you think are the best ones. Thanks.

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• Google App Engine & Django Sandbox: Shell and Web seem to be using different datastores?

  - by tones

  I'm new to both Django and Google App Engine, and am using a sandbox in OSX10.6 with the GoogleAppEngineLauncher. I've got a basic "bookstore" application running from the tutorial in the OReilly "Programming Google App Engine" book. Here's the bug: If I add a new object to the datastore through the web interface, then it's readable through the web interface, but does not appear to exist if I query the datastore through the shell. Vice versa: If I add an object in the shell, then I can read it from the shell, but it doesn't appear in the web interface. Any thoughts or theories would be welcome. Thanks! =T=

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• AWS ECS API - ItemLookup - Get item's (EAN) SalesRank by BrowseNode

  - by Lysender

  I'm using amazon japan, using ItemLookup. We already have the EAN numbers (used as ItemId). It was working well until we need to modify the SalesRank. The previous SalesRank returned is for the whole SearchIndex, ex: Books, Music, etc. What we want is to get the SalesRank for a specific BrowseNode. I don't know but it seems that it is not implemented on Amazon US. For example: http: // www . amazon . com / Slackware-Essentials-Cantrell-Johnson-Lumens/dp/1571763384/ref=sr_1_1?ie=UTF8&s=books&qid=1276142663&sr=1-1 The book above only shows the SalesRank (Bestsellers Rank) but on Japan Amazon: http://www.amazon.co.jp/Slackware-Linux-Dummies/dp/0764506897/ref=sr_1_4?ie=UTF8&s=english-books&qid=1276142708&sr=1-4 It shows SalesRank for other three different BrowseNodes. We need to get the SalesRank for a specific BrowseNode for a given ItemId or by any other means. Any ideas guys? TIA

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• is the + in += on a Map a prefix operator of =?

  - by Steve

  In the book "Programming in Scala" from Martin Odersky there is a simple example in the first chapter: var capital = Map("US" -> "Washington", "France" -> "Paris") capital += ("Japan" -> "Tokyo") The second line can also be written as capital = capital + ("Japan" -> "Tokyo") I am curious about the += notation. In the class Map, I didn't found a += method. I was able to the same behaviour in an own example like class Foo() { def +(value:String) = { println(value) this } } object Main { def main(args: Array[String]) = { var foo = new Foo() foo = foo + "bar" foo += "bar" } } I am questioning myself, why the += notation is possible. It doesn't work if the method in the class Foo is called test for example. This lead me to the prefix notation. Is the + a prefix notation for the assignment sign (=)? Can somebody explain this behaviour?

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• Java classloader delegation model ?

  - by Tony

  When calling a loadClass() on a class loader, the class loader firstly check the class if had been loaded or directly delegate this check to it's parent class loader ? Java api says: When requested to find a class or resource, a ClassLoader instance will delegate the search for the class or resource to its parent class loader before attempting to find the class or resource itself. But there's a specific chapter about class loader in the book <java reflection in action> and says: Class loader calls findLoadedClass to check if the class has been loaded already.If a class loader does not find a loaded class, calls loadClass on the parent class loader. which is correct ?

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• Reading in MIPS external file so another file can use it?

  - by SkyWookie

  Hey all, I'm working on this final thing for my MIPS project and it's deceptively easy. I need to get a procedure (called feed) and let its main driver program use it by reading it in. I know that I'm supposed to use the call code 14 and .globl sym (I think) in order to feed it into the file and have it read it. I just need a basic tutorial or something, as I CANNOT find it on the Internet or in my book (just lists the call code, real helpful). Here's what I know: I need to use read, but I also need a file descriptor (don't know where to get it). I need to put the buffer in $a1 and the length in $a2. Well, that's about it. If there's any decent tutorial you could whip up or if there is one online that I don't see let me know please :). I just need a push in the right direction, I'm sure it can't be too difficult, just can't find any info on it!

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• Books/resources for help with extracting useful feedback from clients?

  - by Eric

  I'm a web application developer looking for a book or something similar that can help with effectively communicating with clients who have a very vague or unrealistic idea of what they'd like out of the work I'm doing. Some fictional, though not by much, examples of situations: Clients who are not familiar with using the Internet, and insist on features that are not even remotely feasible (ex. time travel) Clients who are unable to express accurately what they're looking for (ex. "I know that's what I said and signed off on, but it's not what I meant") Clients who refuse to attend meetings or review sessions to answer questions or define requirements (which makes any agile development impossible) For the most part, I'm trying to find best practices for how to handle these kinds of things on a team-building level. The best ways to effectively address serious project roadblocks without sounding like a total jerk. Any recommendations for reading material on this topic?

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• Is it a good design to return value by parameter?

  - by aztack

  bool is_something_ok(int param,SomeStruct* p) { bool is_ok = false; // check if is_ok if(is_ok) // set p to some valid value else // set p to NULL return is_ok; } this function return true and set p to a valid value if "something is ok" otherwise return false and set p to NULL Is that a good or bad design? personally, i feel uncomfortable when i use it. If there is no document and comment, i really don know how to use it. BTW:Is there some authoritative book/article about API design?

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• resource for migrating from C/C++ to C#

  - by EquinoX

  I know there's a lot of resource for this via google, but I just wanted to hear personally from people who have experienced this before. I've programmed in C for 3 years and C++ for a year and now I am moving to C#. I know this is not going to be a so hard transition but could you guys that had this same experience with me share resources on a good book, article, or blog to make my study experience more efficient. Any tips/tricks or gotchas when moving to C#? Here's one article that I can find via google. Looking for more goodies from experienced developers here.

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• How to view the GDTR's value ?

  - by Mehdi Asgari

  Hi In the book "Rootkit Arsenal" page 84 (Chapter 3) mentions: ..., we can view the contents of the target machine's descriptor registers using the command with the 0x100 mask: kd rM 0x100 and a paragraph below: Note that the same task can be accomplished by specifying the GDTR components explicitly: kd r gdtr .... I run Windbg on my Win XP (inside VMWare) and choose the Kernel Debug - Local. My problem is in case of first command, windbg errors with: lkd rM 0x100 ^ Operation not supported in current debug session 'rM 0x100' and in the second command: lkd r gdtr ^ Bad register error in 'r gdtr' Can anyone guide me ?

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• Android - Get all sms in phone sent to a peson

  - by satyam

  I'm new to android programming. just to improve my skills, i started with some project in my mind. when app starts, it will show a button. on click of it, it will allow me to select a contact from the address book. then i want to retrieve all the sms sent to that contact (if they are stored in sms outbox). Is it possible. Can some one guide me. If there is some tutorial on these topics, can you let me know the URL or source code? Thanks in Advance.

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