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• Good Learning Method for Objective-C?

  - by Josh Kahane

  Hi I know this must be asked a millions times and can't be easy to answer as there is o definitive method, but any help would be appreciated, thanks. I have been playing around with all sorts of things in Xcode and with Objective-C, however I can't seem to find a good way of learning things in an efficient way. I have bought the book 'Programming in Objective-C 2.0' and its great but just lays down the basics it seems. I want to learn in the 2D game development direction, then of course 3D after nailing that, if thats the right thing to do? I am 17 currently in year 13, last year of school/A Levels and am almost definitely taking a gap year. Any good, well known reputable courses online or offline (real world)? This is my first programming language, and I am absolutely serious about learning this. One last question, is when learning things online, I have in the past started building a feature and learning a certain aspect in programming only to find out after adding more its slows down the app or its to inefficient. Is the key to use a certain method in a certain situation (being os many ways to do the same thing) or use any of those methods and refine it in your app to make it run smoothly? Sorry, its hard for me to know when I have little experience, thus far. Sorry for rambling on! I would appreciate any help, thank you!

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• From ASPX to WCF

  - by Barguast

  I'm hoping someone can advise me on how to solve my networking scenario. Both the client and server are to be C# / .NET based. I basically want to invoke some kind of web service from my client in order to retrieve both binary data (e.g. files) and serialised objects and lists of objects (e.g. database query results). At the moment, I'm using ASPX pages, using the query string to provide parameters and I get back either the binary data, or the binary data of the serialised messages. This affords me a lot of flexbility, and I can choose how to transmit the data, perform simulatanous requests, cancel ongoing requests, etc. Since I can control the serialised format, I can also deserialise lists of objects as they are received which is crucial. My problem isn't a problem as such, but this feels a little hack-ish and I can't help but wonder if there are better ways to go about it. I'm considering moving on to WCF or perhaps another technology to see if it helps. However, I need to know if it helps with my scenarios above that is; Can a WCF method return a list of objects, and can the client receive the items of this list as they arrive as opposed to getting the entire list on completion (i.e. streaming). Does anyone know of any examples of this? Am I likely to get any performance benefits from this? I don't know how well ASPX pages are tuned for this, as it surely isn't their primary purpose. Are there any other approaches I should consider? Thanks for your time spent reading this. I hope you can help.

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• Why doesn't this jQuery snippet work in IE8 like it does in Chrome/Firefox (live demo included)?

  - by Siracuse

  I asked for help earlier on Stackoverflow involving highlighting spans with the same Class when a mouse hovers over any Span with that same Class. It is working great: http://stackoverflow.com/questions/2709686/how-can-i-add-a-border-to-all-the-elements-that-share-a-class-when-the-mouse-has $('span[class]').hover( function() { $('.' + $(this).attr('class')).css('background-color','green'); }, function() { $('.' + $(this).attr('class')).css('background-color','yellow'); } ) Here is an example of it in usage: http://dl.dropbox.com/u/638285/0utput.html However, it doesn't appear to work properly in IE8, while it DOES work in Chrome/Firefox. Here is a screenshot of it in IE8, with my mouse hovered over the " min) { min" section in the middle. As you can see, it highlighted the span that the mouse is hovering over perfectly fine. However, it has also highlighted some random spans above and below it that don't have the same class! Only the span's with the same Class as the one where the mouse is over should be highlighted green. In this screenshot, only that middle green section should be green. Here is a screenshot of it working properly in Firefox/Chrome with my mouse in the exact same position: This screenshot is correct as the span that the mouse is over (the green section) is the only one in this section that shares that class. Why is IE8 randomly green-highlighting spans when it shouldn't be (they don't share the same class) using my little jQuery snippet? Again, if you want to see it live I have it here: http://dl.dropbox.com/u/638285/0utput.html

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• Can per-user randomized salts be replaced with iterative hashing?

  - by Chas Emerick

  In the process of building what I'd like to hope is a properly-architected authentication mechanism, I've come across a lot of materials that specify that: user passwords must be salted the salt used should be sufficiently random and generated per-user ...therefore, the salt must be stored with the user record in order to support verification of the user password I wholeheartedly agree with the first and second points, but it seems like there's an easy workaround for the latter. Instead of doing the equivalent of (pseudocode here): salt = random(); hashedPassword = hash(salt . password); storeUserRecord(username, hashedPassword, salt); Why not use the hash of the username as the salt? This yields a domain of salts that is well-distributed, (roughly) random, and each individual salt is as complex as your salt function provides for. Even better, you don't have to store the salt in the database -- just regenerate it at authentication-time. More pseudocode: salt = hash(username); hashedPassword = hash(salt . password); storeUserRecord(username, hashedPassword); (Of course, hash in the examples above should be something reasonable, like SHA-512, or some other strong hash.) This seems reasonable to me given what (little) I know of crypto, but the fact that it's a simplification over widely-recommended practice makes me wonder whether there's some obvious reason I've gone astray that I'm not aware of.

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• Ideas for a rudimentary software licensing implementation

  - by Ross

  I'm trying to decide how to implement a very basic licensing solution for some software I wrote. The software will run on my (hypothetical) clients' machines, with the idea being that the software will immediately quit (with a friendly message) if the client is running it on greater-than-n machines (n being the number of licenses they have purchased). Additionally, the clients are non-tech-savvy to the point where "basic" is good enough. Here is my current design, but given that I have little to no experience in the topic, I wanted to ask SO before I started any development on it: A remote server hosts a MySQL database with a table containing two columns: client-key and license quantity The client-side application connects to the MySQL database on startup, offering it's client-key that I've put into a properties file packaged into the distribution (I would create a new distribution for each new client) Chances are, I'll need a second table to store validation history, so that with some short logic, the software can decide if it can be run on a given machine (maybe a sliding window of n machines using the software per 24 hours) If the software cannot establish a connection to the MySQL database, or decides that it's over the n allowed machines per day, it closes The connection info for the remote server hosting the MySQL database should be hard-coded into the app? (That sounds like a bad idea, but otherwise they could point it to some other always-validates-to-success server) I think that about covers my initial design. The intent being that while it certainly isn't full-proof, I think I've made it at least somewhat difficult to create an easily-sharable cracking solution. Also, I can easily adjust the license amount for a given client/key pair. I gotta figure this has been done a million times before, so tell me about a better solution that's just as simple to implement and provides the same (low) amount of security. In the event that external libraries are used, I prefer Java, as that's what the software has been written in.

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• Cross-browser padding/margins

  - by Lucifer

  Hi All, I was wondering if you could give me some helpful hints on how to correct this issue? I have a main menu on my site, the code for it is as follows: li:hover { background-color: #222222; padding-top: 8px; padding-bottom: 9px; } And here's a demo of what it actually looks like: The problem is that when I hover over a menu option (li), the background appears, but it overflows to the outside of the menu's background, and makes it look really dodgy/crap/cheap/yuck! Note that (obviously) when I change the padding to make it display correctly in these browsers, it appears too small in height in IE! So I'm screwed either way. How can I make little imperfections like this look the same in all browsers? Update: HTML (The menu): <ul class="menu"> <li class="currentPage" href="index.php"><a>Home</a></li> <li><a href="services.php">Services</a></li> <li><a href="support.php">Support</a></li> <li><a href="contact.php">Contact Us</a></li> <li><a href="myaccount/" class="myaccount">My Account</a></li> </ul> The CSS: .menu { margin-top: 5px; margin-right: 5px; width: 345px; float: right; } li { font-size: 9pt; color: whitesmoke; padding-left: 6px; padding-right: 8px; display: inline; list-style: none; } li:hover { background-color: #222222; padding-top: 8px; padding-bottom: 9px; }

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• Delphi, PGDac vs Zeos, Fetch, Lookup?

  - by durumdara

  Hi! I used Zeos to test to know: is ZTable uses fetch technics, or not? May in the future we migrate our lesser system to PGSQL, and this used now "Table" components (as BDE, but it have an SQL-like server). These tables use real cursors, a "Window" with N record, so lookup is very fast, because the Locate/Lookup is started on server, and only these N records are refreshed, no matter, how many records in the lookup table. PGSQL uses fetch technics as I know, and I tested it with a table (id int, name varchar(100)), and 1 million records. (I also trying this with mysql). The adapter is Zeos. ID, sec to find, allocated memory in bytes on client. MySQL 500000 2,761 113 196 344 1000000 3,214 225 471 232 313800 0,437 225 471 232 328066 0,468 225 471 232 276374 0,390 225 471 232 905984 1,264 225 471 232 260253 0,359 225 471 232 PGSQL 500000 3,042 113 188 184 1000000 3,744 225 463 064 313800 0,436 225 463 064 328066 0,452 225 463 064 276374 0,375 225 463 064 905984 1,295 225 463 064 260253 0,359 225 463 064 142023 0,203 225 463 064 As you see the records are fetched locally, this cause the 225 MB usage, and searches are slow a little, based where is the record we must find. I want to ask more things: a.) Is PGDAC have some technics to we can use the lookups without pay the fetch with memory and secs? b.) Or is PG ODBC driver can help in this problem with ADO? (As I know ADO can use server side cursors)? c.) Have anybody some experience with lookup tables, and performance? Is this critical question or it is not? (With client memory usage too). d.) If no chance to avoid fetch hell with lookups, what we can do? Server Side Joins, and unique code for Lookup field changing without real Lookup? Thanks for your help: dd

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• ASP.NET MVC on GoDaddy Not Working (Not Primary Domain Deployment)

  - by JPrescottSanders

  I am trying to get ASP.NET MVC working on GoDaddy and I'm not having much luck. I have read the post on SO that covers the subject, but I must have a slightly different configuration or must be missing somehting along the way because the main MVC page comes up, but all links seem to fail and no amount of tweaking the URLs seems to get it to work. A little back ground. I have a single hosting plan with many domains pointed to sub folders of the main domain. Basic ASP.NET web forms pages work just fine, but of course I wanted to try and host a sample MVC site in one of these non-primary domains. You can go to the URL here. As you can see this first page comes up, but if you click on Home or About it doesn't work. Clicking on Home creates this link "http://www.jprescottsanders.com/jps/" and clicking on about creates this link "http://www.jprescottsanders.com/jps/Home/About". As you can see JPS sneaks in there, this of course is the sub folder that i place my web app files in. I would like to know if this is a MVC related issue or a GoDaddy issue. I suspect that MVC may want to sit in the root directory of the site, and when it puts the "jps" into the URLs it breaks the routing mechanisms (but this is conjecture). I know Dan said this was possible so I'm hoping he sees this and helps me get to the bottom of this deployment strategy for MVC.

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• Advantages/disadvantages of Python and Ruby

  - by Seburdis

  I know this is going to seem a little like all the other python vs ruby question out there, but I'm not looking specifically to pick one over the other all the time. My question is, essentially, why would you use one language over the other when you are starting a new project? What features does ruby have that python doesn't that would make you decide on it for a given project? What about python over ruby? I was just recently thinking about the differentiation between the two languages because of Jamis Buck's "There is no magic, only awesome" series of articles (4 parts, available here) when I realized I really don't know enough about the two languages to know when to choose one over the other. I'm hoping to get objective answers from people who have experience with both languages, rather than just "python is better, ruby sucks" kind of responses. If you know of a feature in one language that doesn't exist in the other and is great in a certain situation, feel free to chime in and say why you think it's awesome. If you have another language comparable to these that you'd like to suggest pros/cons for, like groovy for example, that would be appreciated too. Some thing I know each language has going for it: Ruby: Awesome metaprogramming Great community Wide selection of Gems Rails Great code readability, usually MacRuby is great for native development on Mac without objc Amazing testing tools (cucumber, rspec, shoulda, autotest, etc.) Python: Whitespace indentation List comprehensions Better functional programming support? Lots of support on linux Easy_install isn't far from gems Great variety of libraries available

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• mod_cgi , mod_fastcgi, mod_scgi , mod_wsgi, mod_python, FLUP. I don't know how many more. what is mo

  - by claws

  I recently learnt Python. I liked it. I just wanted to use it for web development. This thought caused all the troubles. But I like these troubles :) Coming from PHP world where there is only one way standardized. I expected the same and searched for python & apache. http://stackoverflow.com/questions/449055/setting-up-python-on-windows-apache says Stay away from mod_python. One common misleading idea is that mod_python is like mod_php, but for python. That is not true. So what is equivalent of mod_php in python? I need little clarification on this one http://stackoverflow.com/questions/219110/how-python-web-frameworks-wsgi-and-cgi-fit-together CGI, FastCGI and SCGI are language agnostic. You can write CGI scripts in Perl, Python, C, bash, or even Assembly :). So, I guess mod_cgi , mod_fastcgi, mod_scgi are their corresponding apache modules. Right? WSGI is some kind of optimized/improved inshort an efficient version specifically designed for python language only. In order to use this mod_wsgi is a way to go. right? This leaves out mod_python. What is it then? Apache - mod_fastcgi - FLUP (via CGI protocol) - Django (via WSGI protocol) Flup is another way to run with wsgi for any webserver that can speak FCGI, SCGI or AJP What is FLUP? What is AJP? How did Django come in the picture? These questions raise quetions about PHP. How is it actually running? What technology is it using? mod_php & mod_python what are the differences? In future if I want to use Perl or Java then again will I have to get confused? Kindly can someone explain things clearly and give a Complete Picture.

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• Prevent empty tooltips at a wpf datagrid

  - by TheCalendarProgrammer

  I am working on a calendar program, which consists mainly of a WPF DataGrid. As there is not always enough space to display all the entries of a day (which is a DataGridCell), a tooltip with all the entries of the day shell appear at mouse over. This works so far with the code snippet shown below. And now the (little) problem: If there are no entries for a day, no tooltip shell pop up. With the code below an empty tooltip pops up. <DataGridTemplateColumn x:Name="Entry" IsReadOnly="True"> <DataGridTemplateColumn.CellTemplate> <DataTemplate> <Grid> <TextBlock Text="{Binding EntryText}" Foreground="{Binding EntryForeground}" FontWeight="{Binding EntryFontWeight}"> </TextBlock> <TextBlock Text="{Binding RightAlignedText}" Foreground="Gray" Background="Transparent"> <TextBlock.ToolTip> <TextBlock Text="{Binding AllEntriesText}"/> </TextBlock.ToolTip> </TextBlock> </Grid> </DataTemplate> </DataGridTemplateColumn.CellTemplate> </DataGridTemplateColumn> The Databinding is made via myCalDataGrid.Itemssource = _listOfDays; in code behind, where a 'Day' is the view model for a single calendar row.

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• Match entities fulfilling filter (strict superset of search)

  - by Jon

  I have an entity (let's say Person) with a set of arbitrary attributes with a known subset of values. I need to search for all of these entities that match all my filter conditions. That is, given a set of Attributes A, I need to find all people that have a set of Attributes that are a superset of A. For example, my table structures look like this: Person: id | name 1 | John Doe 2 | Jane Roe 3 | John Smith Attribute: id | attr_name 1 | Sex 2 | Eye Color ValidValue: id | attr_id | value_name 1 | 1 | Male 2 | 1 | Female 3 | 2 | Blue 4 | 2 | Green 5 | 2 | Brown PersonAttributes id | person_id | attr_id | value_id 1 | 1 | 1 | 1 2 | 1 | 2 | 3 3 | 2 | 1 | 2 4 | 2 | 2 | 4 5 | 3 | 1 | 1 6 | 3 | 2 | 4 In JPA, I have entities built for all of these tables. What I'd like to do is perform a search for all entities matching a given set of attribute-value pairs. For instance, I'd like to be able to find all males (John Doe and John Smith), all people with green eyes (Jane Roe or John Smith), or all females with green eyes (Jane Roe). I see that I can already take advantage of the fact that I only really need to match on value_id, since that's already unique and tied to the attr_id. But where can I go from there? I've been trying to do something like the following, given that the ValidValue is unique in all cases: select distinct p from Person p join p.personAttributes a where a.value IN (:values) Then I've tried putting my set of required values in as "values", but that gives me errors no matter how I try to structure that. I also have to get a little more complicated, as follows, but at this point I'd be happy with solving the first problem cleanly. However, if it's possible, the Attribute table actually has a field for default value: id | attr_name | default_value 1 | Sex | 1 2 | Eye Color | 5 If the value you're searching on happens to be the default value, I want it to return any people that have no explicit value set for that attribute, because in the application logic, that means they inherit the default value. Again, I'm more concerned about the primary question, but if someone who can help with that also has some idea of how to do this one, I'd be extremely grateful.

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• Catching 'Last Record' in Coldfusion for IE javascript bug

  - by Simon Hume

  I'm using ColdFusion to pull UK postcodes into an array for display on a Google Map. This happens dynamically from a SQL database, so the numbers can range from 1 to 100+ the script works great, however, in IE (groan) it decides to display one point way off line, over in California somewhere. I fixed this issue in a previous webapp, this was due to the comma between each array item still being present at the end. Works fine in Firefox, Safari etc, but not IE. But, that one was using a set 10 records, so was easy to fix. I just need a little if statement to wrap around my comma to hide it when it hits the last record. I can't seem to get it right. Any tips/suggestions? here is the line of code in question: var address = [<cfloop query="getApplicant"><cfif getApplicant.dbHomePostCode GT ""><cfoutput>'#getApplicant.dbHomePostCode#',</cfoutput></cfif> </cfloop>]; Hopefully someone can help with this rather simple request. I'm just having a bad day at the office!

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• Regex statements for date ranges <=4/1/2009 and <=10/01/2009

  - by reggiereg

  Hi, I need serious help building two Regex statements for a project. The software we're using ONLY accepts Regex for validation. I need one that fires for any date <4/1/2009 and a second that fires for any date <10/1/2009 My co-worker gave me the following code to check for <=10/01/2010, but it checks leap years and all that stuff. I need something a little more streamlined than this in the MM/DD/YYYY format. Thanks in advance! ^(?:(?:0?[1-9])|(?:1[0-2]))(\/|-|.)(?:0?[1-9]|1\d|2[0-8])(\/|-|.)(?:2[0-9][2-9][0-9])$|^(?:(?:0?[1-9])|(?:1[0-2]))(\/|-|.)(?:0?[1-9]|1\d|2[0-8])(\/|-|.)(?:201[1-9])$|^(?:(?:(?:0?[13578]|1[02])(\/|-|.)31)|(?:(?:0?[1,3-9]|1[0-2])(\/|-|.)(?:29|30)))(\/|-|.)(?:201[1-9])$|^(?:(?:(?:11)(\/|-|.))(?:0?[1-9]|1\d|2[0-9]|30)(\/|-|.))(2010)$|^(?:(?:(?:10|12)(\/|-|.))(?:0?[1-9]|1\d|2[0-9]|30|31)(\/|-|.))(2010)$|^(?:(?:0?[1-9])|(?:1[0-2]))(\/|-|.)(?:0?[1-9]|1\d|2[0-8])(\/|-|.)(?:2[0-9][2-9][0-9])$|^(?:(?:(?:0?[13578]|1[02])(\/|-|.)31)\1|(?:(?:0?[1,3-9]|1[0-2])(\/|-|.)(?:29|30)))(\/|-|.)(?:2[0-9][2-9][0-9])$|^(?:(?:0?[1-9])|(?:1[0-2]))(\/|-|.)(?:0?[1-9]|1\d|2[0-8])(\/|-|.)(?:2011)$|^(?:0?2(\/|-|.)29\3(?:(?:(?:2[0-9][1-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))$

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• how to pass values from one page to another on jquery form submit

  - by andy787899

  I'm trying to build a form using php & jquery, but I'm a little confused as to what to do with the jquery portion of it... Basically, when the user submits the first form, I want to direct them to the "next step" form, but I want to retain the values submitted from the first one in a hidden input field... If someone can either show me how or point me to a good tutorial, I'd appreciate it... I don't have any of the php or jquery yet, and this is just a simplified version of the html markup... //first.php <form name="form1" method="post" action="second.php"> <input type="text" name="name" value="" />Name <input type="submit" name="step1" value="Next" /> </form> //second.php <form name="form2" method="post" action="process.php"> <input type="hidden" name="name" value="{$_POST['name']}" /> <input type="text" name="message" value="" />message <input type="submit" name="step2" value="Finish" /> </form>

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• how to pass values from one page to another on jquery form submit

  - by andy787899

  I'm trying to build a form using php & jquery, but I'm a little confused as to what to do with the jquery portion of it... Basically, when the user submits the first form, I want to direct them to the "next step" form, but I want to retain the values submitted from the first one in a hidden input field... If someone can either show me how or point me to a good tutorial, I'd appreciate it... I don't have any of the php or jquery yet, and this is just a simplified version of the html markup... //first.php <form name="form1" method="post" action="second.php"> <input type="text" name="name" value="" />Name <input type="submit" name="step1" value="Next" /> </form> //second.php <form name="form2" method="post" action="process.php"> <input type="hidden" name="name" value="{$_POST['name']}" /> <input type="text" name="message" value="" />message <input type="submit" name="step2" value="Finish" /> </form>

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• Refresh iFrame (Cache Issue)

  - by Ramiz Uddin

  We are getting a weird issue on which we are not sure what exactly cause it. Let me elaborate the issue. Suppose, we have two different html pages a.html and b.html. And a little script written in index.html: <html> <head> <script> function reloadFrame(iframe, src) { iframe.src = src; } </script> </head> <body> <form> <iframe id="myFrame"></iframe> <input type="button" value="Load a.html" onclick="reloadFrame(document.getElementById('myFrame'), 'a.html')"> <input type="button" value="Load b.html" onclick="reloadFrame(document.getElementById('myFrame'), 'b.html')"> </form> </body> </html> A server component is continuously updating both files a.html and b.html. The problem is the content of both files are successfully updating on the server side. If we open we can see the updated changes but client getting the older content which doesn't show the updated changes. Any idea?

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• On Windows 7: Same path but Explorer & Java see different files than Powershell

  - by Ukko

  Submitted for your approval, a story about a poor little java process trapped in the twilight zone... Before I throw up my hands and just say that the NTFS partition is borked is there any rational explanation of what I am seeing. I have a file with a path like this C:\Program Files\Company\product\config\file.xml I am reading this file after an upgrade and seeing something wonky. Eclipse and my Java app are still seeing the old version of this file while some other programs see the new version. The test that convinced my it was not my fat finger that caused the problem was this: In Explorer I entered the above path and Explorer displayed the old version of the file. Forcing Explorer to reload via Ctrl-F5 still yields the old version. This is the behavior I get in Java. Now in PowerShell I enter more "C:\Program Files\Company\product\config\file.xml" I cut and past the path from Explorer to make sure I am not screwing anything up and it shows me the new version of the file. So for the programming aspect of this, is there a cache or some system component that would be storing this stale reference. Am I responsible for checking or reseting that for some class of files. I can imagine somebody being "creative" in how xml files are processed to provide some bell or whistle. But it could be a case of just being borked. Any insights appreciated...Thanks!

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• Persistent warning message about "initWithDelegate"!

  - by RickiG

  Hi This is not an actual Xcode error message, it is a warning that has been haunting me for a long time. I have found no way of removing it and I think I maybe have overstepped some unwritten naming convention rule. If I build a class, most often extending NSObject, whose only purpose is to do some task and report back when it has data, I often give it a convenience constructor like "initWithDelegate". The first time I did this in my current project was for a class called ISWebservice which has a protocol like this: @protocol ISWebserviceDelegate @optional - (void) serviceFailed:(NSError*) error; - (void) serviceSuccess:(NSArray*) data; @required @end Declared in my ISWebservice.h interface, right below my import statements. I have other classes that uses a convenience constructor named "initWithDelegate". E.g. "InternetConnectionLost.h", this class does not however have its methods as optional, there are no @optional @required tags in the declaration, i.e. they are all required. Now my warning pops up every time I instantiate one of these Classes with convenience constructors written later than the ISWebservice, so when utilizing the "InternetConnectionLost" class, even though the entire Class owning the "InternetConnectionLost" object has nothing to do with the "ISWebservice" Class, no imports, methods being called, no nothing, the warning goes: 'ClassOwningInternetConnectionLost' does not implement the 'ISWebserviceDelegate' protocol I does not break anything, crash at runtime or do me any harm, but it has begun to bug me as I near release. Also, because several classes use the "initWithDelegate" constructor naming, I have 18 of these warnings in my build results and I am getting uncertain if I did something wrong, being fairly new at this language. Hope someone can shed a little light on this warning, thank you:)

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• Erlang OTP application design

  - by Toby Hede

  I am struggling a little coming to grips with the OTP development model as I convert some code into an OTP app. I am essentially making a web crawler and I just don't quite know where to put the code that does the actual work. I have a supervisor which starts my worker: -behaviour(supervisor). -define(CHILD(I, Type), {I, {I, start_link, []}, permanent, 5000, Type, [I]}). init(_Args) -> Children = [ ?CHILD(crawler, worker) ], RestartStrategy = {one_for_one, 0, 1}, {ok, {RestartStrategy, Children}}. In this design, the Crawler Worker is then responsible for doing the actual work: -behaviour(gen_server). start_link() -> gen_server:start_link(?MODULE, [], []). init([]) -> inets:start(), httpc:set_options([{verbose_mode,true}]), % gen_server:cast(?MODULE, crawl), % ok = do_crawl(), {ok, #state{}}. do_crawl() -> % crawl! ok. handle_cast(crawl}, State) -> ok = do_crawl(), {noreply, State}; do_crawl spawns a fairly large number of processes and requests that handle the work of crawling via http. Question, ultimately is: where should the actual crawl happen? As can be seen above I have been experimenting with different ways of triggering the actual work, but still missing some concept essential for grokering the way things fit together. Note: some of the OTP plumbing is left out for brevity - the plumbing is all there and the system all hangs together

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• What would cause native gem extensions on OS X to build but fail to load?

  - by goodmike

  I am having trouble with some of my rubygems, in particular those that use native extensions. I am on a MacBookPro, with Snow Leopard. I have XCode 3.2.1 installed, with gcc 4.2.1. Ruby 1.8.6, because I'm lazy and a scaredy cat and don't want to upgrade yet. Ruby is running in 32-bit mode. I built this ruby from scratch when my MBP ran OSX 10.4. When I require one of the affected gems in irb, I get a Load Error for the gem extension's bundle file. For example, here's nokogigi dissing me: > require 'rubygems' = true > require 'nokogiri' LoadError: Failed to load /usr/local/lib/ruby/gems/1.8/gems/nokogiri-1.4.1/lib/nokogiri/nokogiri.bundle This is also happening with the Postgres pg and MongoDB mongo gems. My first thought was that the extensions must not be building right. But gem install wasn't throwing any errors. So I reinstalled with the verbose flag, hoping to see some helpful warnings. I've put the output in a Pastie, and the only warning I see is a consistent one about "passing argument n of ‘foo’ with different width due to prototype." I suspect that this might be an issue from upgrading to Snow Leopard, but I'm a little surprised to experience it now, since I've updated my XCode. Could it stem from running Ruby in 1.8.6? I'm embarrassed that I don't know quite enough about my Mac and OSX to know where to look next, so any guidance, even just a pointer to some document I couldn't find via Google, would be most welcome. Michael

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• Moral fits the story or suggest me a nice moral?

  - by Gobi

  A 25 year old son was sitting beside his old father in a train one day. When the train was about to leave, all the passengers started settling down in their seats. The son was filled with joy and anxiety. He was seated by the window. He put his hand out and felt the breeze and screamed, “ Papa look at all the trees, they are moving behind”. The old father smiled and admired his son’s feelings. Beside the old man, a couple was also travelling and observed this strange behavior. They found something awkward and childish in the behavior of this 25 year old man. All of a sudden, the son shouted again “Papa see! The clouds are moving about; there is a pond down and many cows are drinking it’s water”. It soon started drizzling. Once again, the young man felt exited and said “papa, I can see and feel the rain drops touching my hand”. The couple seeing this and feeling concerned, asked the old man “why don’t you consult a good doctor and treat your son; don’t you find something abnormally different in him ?” The old man replied, “Yes, I have provided the best treatment for my only boy. We are just returning from the hospital. I am happy for today is the day he has received his sense of sight. It’s for the first time my son is seeing and relishing these little wonders which we have been watching and ignoring in our routine life!” The couple had no words to reply and felt sorry for their remarks. Moral of the story: “ “don’t judge a book by its cover”. is this the moral fits the story or provide me some moral for this story :)

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• Pulling info from database and dynamically adding them into different divs

  - by Matt Nathanson

  This may be a bit of a php n00b question but i've managed to get it working this far and I'm a little bit stuck. I'm pulling 12 images with descriptions out of a database. I want to insert them into a client rotator that has 3 sets of 4. They will be contained in divs called clientrotate1, clientrotate2, and clientrotate3 respectively. Inside each of those divs I want to have 4 images with classes thumb1, thumb2, thumb3, and thumb4 I am successful in having the images and descriptions pull into clientrotator 1. Where I get stuck is to how to dynamically add the 2nd and 3rd set of data into clientrotator2 and clientrotator3. Here is my function: public function DisplayClientRotator(){ $result = mysql_query( 'SELECT * FROM project ORDER BY id DESC LIMIT 12' ) or die("SELECT Error: ".mysql_error()); $iterator = 1; while ($row = mysql_fetch_assoc($result)) { echo "<div id='clientrotate1'>"; echo "<div class='thumb$iterator'>"; echo "<img style='width: 172px; height: 100px;' src=".$row['photo']." />"; echo "<div class='transbox'>"; echo "<div class='thumbtext'>"; echo $row['campaign']; echo "</div>"; echo "</div>"; echo "</div>"; echo "</div>"; $iterator++; } Any help or pointers int he right direction would be greatly appreciated! Thanks so much, Matt

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• How can I remove an "ALMOST" Duplicate using LINQ? ( OR SQL? )

  - by Atomiton

  This should be and easy one for the LINQ gurus out there. I'm doing a complex Query using UNIONS and CONTAINSTABLE in my database to return ranked results to my application. I'm getting duplicates in my returned data. This is expected. I'm using CONTAINSTABLE and CONTAINS to get all the results I need. CONTAINSTABLE is ranked by SQL and CONTAINS (which is run only on the Keywords field ) is hard-code-ranked by me. ( Sorry if that doesn't make sense ) Anyway, because the tuples aren't identical ( their rank is different ) a duplicate is returned. I figure the best way to deal with this is use LINQ. I know I'll be using the Distinct() extension method, but do I have to implement the IEqualityComparer interface? I'm a little fuzzy on how to do this. For argument's sake, say my resultset is structured like this class: class Content { ContentID int //KEY Rank int Description String } If I have a List<Content> how would I write the Distinct() method to exclude Rank? Ideally I'd like to keep the Content's highest Rank. SO, if one Content's RAnk is 112 and the other is 76. I'd like to keep the 112 rank. Hopefully I've given enough information.

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• Running multiple applications in STM32 flash

  - by Richard

  Hey! I would like to have two applications in my STM32 flash, one is basically a boot and the other the 'main' application. I have figured out how to load each of them into different areas of flash, and after taking a memory dump everything looks like it is in the right place. So when I do a reset it loads the boot, all the boot does at the moment is jump to the application. Debugging the boot, this all appears to work correctly. However the problems arrives after i've made the jump to the application, it just executes one instruction (assembly) and then jumps back to the boot. It should stay in the application indefinitely. My question is then, where should I 'jump' to in the app? It seems that there are a few potential spots, such as the interrupt vectors, the reset handler, the main function of the app. Actually I've tried all of those with no success. Hopefully that makes sense, i'll update the question if not. thanks for your help! Richard Updates: I had a play around in the debugger and manually changed the program counter to the main of the application, and well that worked a charm, so it makes me think there is something wrong with my jump, why doesn't the program counter keep going after the jump? Actually it seems to be the PSR, the 'T' gets reset on the jump, if I set that again after the jump it continues on with the app as I desire Ok found a solution, seems that you need to have the PC LSB set to 1 when you do a branch or it falls into the 'ARM' mode (32 bit instruction instead of 16 bit instructions like in the 'thumb' mode. Quite an obscure little problem, thanks for letting me share it with you!

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