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  • Solid Principle examples anywhere?

    - by user231465
    We all write code with some patterns even when we dont realise it. I am trying to really understand some of the solid principles and how you apply this principles in the real world. I am struggling with the "D" my understanding on Dependency Inversion I sometimes confuse with Dependency Injection is that as long as you keep things depending on abstraction (IE:interfaces) you are done. Has anybody got a small c# sample that explains it? thanks

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  • A NSMutableArray is destroying my life!

    - by camilo
    EDITED to show the relevant part of the code Hi. There's a strange problem with an NSMutableArray which I'm just not understanding... Explaining: I have a NSMutableArray, defined as a property (nonatomic, retain), synthesized, and initialized with 29 elements. realSectionNames = [[NSMutableArray alloc] initWithCapacity:29]; After the initialization, I can insert elements as I wish and everything seems to be working fine. While I'm running the application, however, if I insert a new element in the array, I can print the array in the function where I inserted the element, and everything seems ok. However, when I select a row in the table, and I need to read that array, my application crashes. In fact, it cannot even print the array anymore. Is there any "magical and logical trick" everybody should know when using a NSMutableArray that a beginner like myself can be missing? Thanks a lot. I declare my array as realSectionNames = [[NSMutableArray alloc] initWithCapacity:29]; I insert objects in my array with [realSectionNames addObject:[category categoryFirstLetter]]; although I know i can also insert it with [realSectionNames insertObject:[category categoryFirstLetter] atIndex:i]; where the "i" is the first non-occupied position. After the insertion, I reload the data of my tableView. Printing the array before or after reloading the data shows it has the desired information. After that, selecting a row at the table makes the application crash. This realSectionNames is used in several UITableViewDelegate functions, but for the case it doesn't matter. What truly matters is that printing the array in the beginning of the didSelectRowAtIndexPath function crashes everything (and of course, doesn't print anything). I'm pretty sure it's in that line, for printing anything he line before works (example): NSLog(@"Anything"); NSLog(@"%@", realSectionNames); gives the output: 2010-03-24 15:16:04.146 myApplicationExperience[3527:207] Anything [Session started at 2010-03-24 15:16:04 +0000.] GNU gdb 6.3.50-20050815 (Apple version gdb-967) (Tue Jul 14 02:11:58 UTC 2009) Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i386-apple-darwin".sharedlibrary apply-load-rules all Attaching to process 3527. Still not understanding what kind of stupidity I've done this time... maybe it's not too late to follow the career of brain surgeon?

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  • Can someone explain this 'double negative' trick?

    - by ProfessionalAmateur
    Hello, I am by no means an expert at javascript, but I have been reading Dave Pilgrim's "Dive into HTML5" webpage and he mentioned something that I would like a better understanding of. He states: "Finally, you use the double-negative trick to force the result to a Boolean value (true or false)." function supports_canvas() { return !!document.createElement('canvas').getContext; } If anyone can explain this a little better I would appreciate it!

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  • how to set wxPython main frame bottom right on screen?

    - by Hitesh Chavda
    For better description, +-----------------------+ | Desktop (screen) | | | | | | +----------+ | | | wxPython | | | | App. | | | | | | | | | | | +----------+ | +-----------------------+ Look at WxPython App., which is align to the bottom right of screen. How to I position my main frame because screen width is different on each pc? For Better Understanding, I want to pop-up small window like Digsby and FeedNotifier use! i think both use python!!

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  • XHTML 1.0 Transitive, is there a tool that can refactor HTML?

    - by GenEric35
    I have a Asp.net web application running with the following config setting. <xhtmlConformance mode="Legacy"/> This limits use of AJAX and compatibility with multiple browser. If my understanding is correct, the HTML code of the aspx pages need to be fixed to comply with XHTML 1.0 Transitional. There are alot of HTML pages, ~1000, is there a tool that could speed up this process?

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  • what does "dead beef" mean?

    - by Xi
    Hi there: What does the word "dead beef" mean? I read it from a interview question. It has something to do with ipv6. I figured it could be a random hex number used for examples, like "The quick brown fox jumps over the lazy dog". Is my understanding correct? Or it has more significant meaning? Thanks!

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  • PHPUnit with Zend Framework

    - by ArneRie
    Hi, i have studied some examples for PHPUnit with Zend Framework, but there is one part iam not understanding. In the most examples, the Application Bootstrap runs from some kind of baseClass inside the setUp() Method. Why not in __construct()? Is there any good reason? Example iam talking about

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  • Data mining google's web search results?

    - by cheesebunz
    Currently, i have a google web search. If a user searches starbucks, I would only want to retrieve the company or product information, not some other weird links like blog pages, using javascript, is it possible to do so? if yes, how am i able to do it? Kind of a newbie in the data mining part..thanks! Added my coding for download for clearer understanding : http://www.mediafire.com/?mzgo233kngm

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  • PHP: How to get creation date from uploaded file?

    - by Haemp
    Problem: I want to determine the original file creation time from a file uploaded to my server via PHP. My understanding is that the file is copied from the client to a temporary file on my server, which then is referenced in the $_FILES var. The temporary file is of course of no use because it was just created. Is there any way I could get the creation date from the clients original file? Thanks

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  • Ruby BigDecimal sanity check (floating point newb)

    - by Andy
    Hello, Hoping to get some feedback from someone more experienced here. I haven't dealt with the dreaded floating-point calculation before... Is my understanding correct that with Ruby BigDecimal types (even with varying precision and scale lengths) should calculate accurately or should I anticipate floating point shenanigans? All my values within a Rails application are BigDecimal type and I'm seeing some errors (they do have different decimal lengths), hoping it's just my methods and not my object types... Thanks!

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  • XHTML 1.0 Strict, is there a tool that can refactor HTML?

    - by GenEric35
    I have a Asp.net web application running with the following config setting. <xhtmlConformance mode="Legacy"/> This limits use of AJAX and compatibility with multiple browser. If my understanding is correct, the HTML code of the aspx pages need to be fixed to comply with XHTML 1.0 Strict. There are alot of HTML pages, ~1000, is there a tool that could speed up this process?

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  • Best tutorials or sites for Actionscript 3.

    - by befall
    This is semi-redudant, but the other entries on here didn't yield anything. I know a bit of AS3, but only from copying segments and attempting to figure it out. Is there any online resources for going through from the beginning and UNDERSTANDING everything, allowing me to more creatively interpret and learn it? Anything is appreciated, thanks.

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  • will mmap use user cpu instead of whole sys cpu? (solaris)

    - by Daniel
    when use mmap to allocate some anonymous mem, we often set the start address as 0/null so mmap will figure out the starting address by itself. And to get the start address, it will work thought the whole virtual memory space to find a hole which could put the chuck of mem to be allocated. I guess this is calculated as user cpu instead of sys cpu. If the virtual memory is fragmented, then the time to find the starting address will use more user cpu, is my understanding correct

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  • Tuples vs. Anonymous Types vs. Expando object. (in regards to LINQ queries)

    - by punkouter
    I am a beginner who finally started understanding anonymous types. (see old post http://stackoverflow.com/questions/3010147/what-is-the-return-type-for-a-anonymous-linq-query-select-what-is-the-best-way-t) So in LINQ queries you form the type of return value you want within the linq query right? It seems the way to do this is anonymous type right? Can someone explain to me if and when I could use a Tuple/Expando object instead? They all seem very simliar?

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  • C# multiple asynchronous HttpRequest with one callback

    - by aepheus
    I want to make 10 asynchronous http requests at once and only process the results when all have completed and in a single callback function. I also do not want to block any threads using WaitAll (it is my understanding that WaitAll blocks until all are complete). I think I want to make a custom IAsyncResult which will handle multiple calls. Am I on the right track? Are there any good resources or examples out there that describe handling this?

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  • What are the reasons for casting a void pointer?

    - by Maulrus
    I'm learning C++ from scratch, and as such I don't have an expert understanding of C. In C++, you can't cast a void pointer to whatever, and I understand the reasons behind that. However, I know that in C, you can. What are the possible reasons for this? It just seems like it's be a huge hole in type safety, which (to me) seems like a bad thing.

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  • What is an MQ and why do I want to use it?

    - by daveslab
    Hi folks, On my team at work, we use the IBM MQ technology a lot for cross-application communication. I've seen lately on Hacker News and other places about other MQ technologies like RabbitMQ. I have a basic understanding of what it is (a commonly checked area to put and get messages), but what I want to know what exactly is it good at? How will I know where I want to use it and when? Why not just stick with more rudimentary forms of interprocess messaging?

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  • Need some information regarding data warehousing field

    - by Mirage
    I am a web developer and i would like to shift my field to data warehousing. Can anyone please give me some idea , which langauges or stuff i need to learn like cogonos , datastage, etl or IF anyone currently working can guide me how can i start , i will thankful to you. DO i nned to do oracle because i know mysql , sql. My basic understanding with databse is good. Any books

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  • pointer is always byte aligned

    - by kumar
    Hi, I read something like pointer must be byte-aligned. My understanding in a typical 32bit architecture... all pointers are byte aligned...No ? Please confirm. can there be a pointer which is not byte-aligned ?

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  • return an address of a double

    - by bks
    i'm having an issue understanding why the following works: void doubleAddr(double* source, double** dest) { *dest = source; } i get a pointer to a double and want to change the double that dest points to: //usage: int main() { double* num; double* dest; doubleAddr(num, &dest); return 0; } thanks in advance

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