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• Problem with Clojure function

  - by Bozhidar Batsov

  Hi, everyone, I've started working yesterday on the Euler Project in Clojure and I have a problem with one of my solutions I cannot figure out. I have this function: (defn find-max-palindrom-in-range [beg end] (reduce max (loop [n beg result []] (if (>= n end) result (recur (inc n) (concat result (filter #(is-palindrom? %) (map #(* n %) (range beg end))))))))) I try to run it like this: (find-max-palindrom-in-range 100 1000) and I get this exception: java.lang.Integer cannot be cast to clojure.lang.IFn [Thrown class java.lang.ClassCastException] which I presume means that at some place I'm trying to evaluate an Integer as a function. I however cannot find this place and what puzzles me more is that everything works if I simply evaluate it like this: (reduce max (loop [n 100 result []] (if (>= n 1000) result (recur (inc n) (concat result (filter #(is-palindrom? %) (map #(* n %) (range 100 1000)))))))) (I've just stripped down the function definition and replaced the parameters with constants) Thanks in advance for your help and sorry that I probably bother you with idiotic mistake on my part. Btw I'm using Clojure 1.1 and the newest SLIME from ELPA.

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• Should I call class destructor in this code?

  - by peterg

  I am using this sample to decode/encode some data I am retrieving/sending from/to a web server, and I want to use it like this: BOOL HandleMessage(UINT uMsg,WPARAM wParam,LPARAM lParam,LRESULT* r) { if(uMsg == WM_DESTROY) { PostQuitMessage(0); return TRUE; } else if(uMsg == WM_CREATE) { // Start timer StartTimer(); return TRUE; } else if(uMsg == WM_TIMER) { //get data from server char * test = "test data"; Base64 base64; char *temp = base64.decode(test); MessageBox(TEXT(temp), 0, 0); } } The timer is set every 5 minutes. Should I use delete base64 at the end? Does delete deallocates everything used by base64?

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• What is ExtJS philosophy? Single page application?

  - by stach

  I need to write my next project using ExtJs. It's a nice Javascript lib but I don't fully understand the idea behind it. Take the docs page for example: http://www.extjs.com/deploy/dev/docs/ Am I supposed to write my web applications with extjs like that? One page that should never be refreshed, and everything getting done by AJAX? How do you debug such applications if getting to the right place may take a lot of 'clicking' and working with it. You cannot fix the bug and hit refresh in the browser to see the results. Any suggestions?

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• In DOM is it OK to use .notation for getting/setting attributes?

  - by Ziggy

  Hi In DOM, is it OK to refer to an element's attributes like this: var universe = document.getElementById('universe'); universe.origin = 'big_bang'; universe.creator = null; universe.style.deterministic = true; ? My deep respect for objects and their privacy, and my sense that things might go terribly wrong if I am not careful, makes me want to do everything more like this: var universe = document.getElementById('universe'); if(universe.hasAttribute('origin')) then universe.origin = 'big_bang'; etc... Is it really necessary to use those accessor methods? Of course it may be more or less necessary depending on how certain I am that the elements I am manipulating will have the attributes I expect them to, but in general do the DOM guys consider it OK to use .notation rather than getters and setters? Thanks!

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• Google map blank when used with master page

  - by asp316

  I wrote a google map lookup page. Everthing worked fine until I referenced the page to use a master page. I removed the form tag from the master page as the search button on the map page is a submit button. Everything else on my page appears but the google map div appears with map navigation controls and logo but no map visuals appear. I retested with the previous, non master page version and the map appears correctly. Any thoughts on what I'm missing?

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• Visual Studio 2008 Solution Explorer Randomly Expands Folders

  - by Ray

  VS 2008 is randomly opening sub-folders for me. Sometimes just a few, sometimes every sub-folder in my project or solution. This happens even when I am not using it - last night when I knoocked off, my solution explorer was closed up tight - this morning, one large project had dozens of sub-folders open. This is not a matter of restoring a previously saved state - most of the folders that get opened are not part of the project, and I have never looked at them with VS. I have downloaded and installed the PowerCommands add-in, and it lets me collapse everything nicely. But I don't want to have to do this several times per day - it closes up folders that I want to be open as well. So, does anyone know why this happens and how to stop it? I found this question from a few months ago which is about the same as this one, but was not answered. I am hoping someone has figured out a solution.

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• How to turn off Video Acceleration programatically.

  - by Stefan

  Im using the Windows Media Player OCX in a program runned on hundreds of computers (dedicated). I have found out that when video acceleration is turned on to "full", on some computers it will cause the video to fail to play correct, with green squares between movies and so on. Turn the acceleration to "None" and everything is fine. This program is runned on ~800 computers that will autoupdate my program. So I want to add to the startup to my program that it turns off the video acceleration. The question is, how do I turn off video Acceleration Programatically? All computers are running XP and at least the second service pack. It would take me ages to manually logg in to all those computers and change that setting so thats why I want the program to be able to do it automagically for me.

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• Encryption-Decryption in Rails

  - by Salil

  Hi All, I am using require 'digest/sha1' to encrypt my password and save into database. During login I authenticate by matching the encrypted password saved in database and again encrypted the one use enter in password field. As of now everything works fine but now I want to do 'Forgot Password' functionality. To do this I need to decrypt the password which is saved in database to find original one. How to decrypt using digest/sha1? Or does anyone know any algorithm which supports encryption & decryption as well? I am using ruby on rails so I need Ruby way to accomplish it.

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• chatbot using twisted and wokkel

  - by dmitriy k.

  I am writing a chatbot using Twisted and wokkel and everything seems to be working except that bot periodically logs off. To temporarily fix that I set presence to available on every connection initialized. Does anyone know how to prevent going offline? (I assume if i keep sending available presence every minute or so bot wont go offline but that just seems too wasteful.) Suggestions anyone? Here is the presence code: class BotPresenceClientProtocol(PresenceClientProtocol): def connectionInitialized(self): PresenceClientProtocol.connectionInitialized(self) self.available(statuses={None: 'Here'}) def subscribeReceived(self, entity): self.subscribed(entity) self.available(statuses={None: 'Here'}) def unsubscribeReceived(self, entity): self.unsubscribed(entity) Thanks in advance.

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• List replies in a winform

  - by andrew

  In my C# app I get an xml from a server that contains some replies like in a forum thread (with elements like author, time, body, title, whatever). When I get this xml, I create a new form in which i want to display these replies, and a little text box with an "add reply" button. I'd also like some edit buttons on perhaps my own replies in the reply list displayed in the form. The simplest way that came to my mind to display the replies is to put a web browser control in the form, generate a full html page in a string from the xml, and throw it in that web browser control. And under it i can put the text box with the add reply button. Everything is ok, except that i have no idea of how i could implement the edit function on my own replies (i mean i could add a link in there... but link to what) I would like to know if there is a way to get that edit event from the web browser control (my guess is i can't) or another (maybe simple/easy) idea of displaying the replies in a winform using other controls

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• How do I set a SQL Server 2008 Reporting Services Template to a Default Font?

  - by David Stein

  I'm creating a new template to create reports from at a later date. I know how to create one, and I know where to save it. However, the problem is this. Everything that is created on the report uses the default font of Arial with a size of 10pt. I need to set mine to default to Tahoma 11pt. I can create a mock title, mock tables, etc and save those to Tahoma 11pt, but any new controls that are used on any version of this report will default back to Arial 10pt. How do I fix this?

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• What TypeScript pattern can I use to enforce that a function gets a property?

  - by Matt York

  In JavaScript I can do this: function f() {} f.prop = "property"; I want this in TypeScript, but with type checking. What TypeScript pattern can I use to enforce that a function gets a property? Could I use an interface? interface functionWithProperty { (): any; prop: string; } This seems to be a valid interface in TypeScript, but how do I implement this interface such that the TypeScript compiler checks that prop is set? I saw this example: var f : functionWithProperty = (() => { var _f : any = function () { }; _f.prop = "blah"; return _f; }()); But this doesn't work because I can remove _f.prop = "blah"; and everything will still compile. I need to enforce that prop is set.

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• saving appengine mail from spam filters

  - by Fh

  One of my clients uses Trend Micro InterScan Messaging Security to protect their internal mail services. Suddenly InterScan decided to filter out all messages coming from Google App Engine. Unfortunately they haven't been able to whitelist the sender address as each e-mail gets a different one. For example, *3ckihSOVMMHlZHSL.JSMMHlZHSL.JS*@apphosting.bounces.google.com, with everything before the @ being variable. Update I'm including this screenshot of how Interscan sees the incoming e-mail. Notice that all senders are different: If I look into the e-mail headers, the apphosting domain appears inside the Return-Path field: Return-Path: <36kSiSwYIBh0883XL3E7.5EH883XL3E7.5E@apphosting.bounces.google.com> The "From" field looks ok. It says what I set it to say, but the spam filter only looks at the Return-Path. My client sysadmin doesn't want to whitelist the whole apphosting domain, as it wouldn't be only whitelisting my application. How could I bypass this e-mail filters if I can't get an unique sender? Thanks,

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• Can I use SQL to update multiple rows with multiple values from another table?

  - by stu

  I've got a one to many table with ids and traits for those users. I want to copy one user's settings to another. userid trait onoff ------ ----- ----- 1 1 on 1 2 on 1 3 on 1 4 on 2 1 off 2 2 off 2 3 off 2 4 off So I want to copy the onoff values from user 1 to 2, so that user2 has everything on when I'm done. update table set onoff = (select onoff from table where userid=1) where userid=2 that's the basic idea, but obviously doesn't work. I imagine I want the server to think in terms of a correlated subquery, but the outer part isn't a query, it's an update. Is this even possible in one step?

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• Ruby and Rails Async

  - by Edijs Petersons

  I need to perform long-running operation in ruby/rails asynchronously. Googling around one of the options I find is Sidekiq. class WeeklyReportWorker include Sidekiq::Worker def perform(user, product, year = Time.now.year, week = Date.today.cweek) report = WeeklyReport.build(user, product, year, week) report.save end end # call WeeklyReportWorker.perform_async('user', 'product') Everything works great! But there is a problem. If I keep calling this async method every few seconds, but the actual time heavy operation performs is one minute things won't work. Let me put it in example. 5.times { WeeklyReportWorker.perform_async('user', 'product') } Now my heavy operation will be performed 5 times. Optimally it should have performed only once or twice depending on whether execution of first operaton started before 5th async call was made. Do you have tips how to solve it?

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• Why is my CSS tool tip not functioning properly in Google Chrome, but fine in Firefox??

  - by JAG2007

  http://betawww.helpcurenow.org/media/press/ You'll see I have used spans within an anchor, with the span.hover-description set to display:none; by default, and on a:hover that span is set to display block and absolutely positioned to create a tool-tip effect when hovering over the name and email of the "For Immediate Release" contact names. Everything looks as desired in Firefox, but Chrome reveals my unknown blunder somewhere. Any help on what's the problem that is causing Chrome to not display like Firefox? Incidentally, Explorer shows the tool tip as expected, although I'm getting a funky bottom margin issue below the names, and Safari has the same issue as Chrome (must be a webkit rendering setting that I need to accommodate for).

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• What is the code for a number sign in sharepoint?

  - by Robin

  I've created a link in Sharepoint using the Content Editor Web Part. My link uses html to open up an email with the fields to, cc, subject, and body filled out. However, in the cc section I need a number sign (#) for a mailbox. When I use the html code & #35;(minus the space) my entire code crumbles. Everything starting at the "&" disappears. However, just for kicks I tried & pound;(minus the space) and the code works for a european pound sign. Not sure what else to try. Any suggestions?

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• Java - Could not find the main class?

  - by asmo

  I'm having a hard-time with a Java error. I'm getting this when double-clicking on my compiled project Jar file in order to run it: Could not find the main class: testPackage.testFrame. Program will exit. However, my main class is cleary defined in the project properties. Furthermore, everything works fine when I run the project directly from NetBeans. I'm using the ip2c.jar third-party library to determine countries from IP addresses. If I comment the class that is using the ip2c.jar file, I don't get the error. How can a third-party library be preventing the JVM from finding my main class?

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• Your Django Development process/steps (Step by Step)

  - by AJ

  I want to know step by step process of how folks develop on Django here. I have seen that whenever I try to create a website in Django, I always get confused amongst: DB Schema/models.py UI/Template Structure Login module urls.py views.py How do you approach this? I may have missed something. You do not need to elaborate everything, just stepwise what you do. If you do two things at the same time (or side-by-side), that would also be helpful to mention. Thanks a lot.

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• How can I sync a database driven website to a different server

  - by tbrandao

  I have a website using cPanel on a dedicated account, I would like to be able to automatically sync the website to a second hosting company or perhaps to a local (in house ) server. Basically this is a type of replication. The website is database driven (MySQL), so Ideally it would sync everything (content, database, emails etc.) , but most importantly is syncing the website files and its database. I'm not so much looking for a fail-over solution as an automatic replication solution, so if the primary site (Server) goes off-line, I can manually bring up the replicated site quickly. I'm familiar with tools like unison and rsync, but most of these only sync file(s) and do not do too well with open database connections.

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• Pythagoras triangle

  - by Gogolo

  I would like to ask you about this programing part, is it everything ok? the task was: Write the pseudocode or flow diagram and code for the theorem of Pythagoras - for right-angle triangle with three ribs (a, b, and c) of type integer int KendiA = 0; int KendiB = 0; int H = 0; string Trekendeshi = null; int gjetja = 0; for (KendiA = 1; KendiA <= 15; KendiA++) { for (KendiB = 1; KendiB <= 15; KendiB++) { for (H = 1; H <= 30; H++) { if ((Math.Pow(KendiA, 2) + Math.Pow(KendiB, 2) == Math.Pow(H, 2))) { gjetja = gjetja + 1; Trekendeshi = gjetja + "\t" + KendiA + "\t" + KendiB + "\t" + H; Console.WriteLine(Trekendeshi); } } } }

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• Connecting ipad to external monitor

  - by Josh P.

  I am trying to connect my ipad app to an external screen using the following (not checking the correct resolution for no - just want it up and running). - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { [window addSubview:[navigationController view]]; if ([[UIScreen screens] count] > 1) { window.screen = [[UIScreen screens] objectAtIndex:1]; } [window makeKeyAndVisible]; return YES; } Is this supposed to redirect everything to the external monitor? How dows it work with touches/gestures? I see in the Apple apps, the controls etc are left on the ipad screen...

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• How Does a Login system generally work with OOP?

  - by fakingfantastic

  Sorry if this is a badly formed question, but I'm trying to make my web applications (using PHP) more OO. *EDIT* I'm developing the Framework myself */EDIT* Everything is great so far, I've made a Front Controller system that taps into a MVC system. The FC figures out what page you want, loads the specific page Controller (*EDIT* which extends an abstract Controller Object */EDIT*), which gets anything it needs from Models, and then calls the appropriate View. Very basic. But now, I need to make an admin section (quasi-CMS). How does a login system fit into the grand scheme of things? Do you set controllers as needing a login? If so, how? What If you only want certain views of a controller requiring login? Thanks in advance.

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• Language construct naming: Function/Goto

  - by sub

  How is a language construct with the following properties called? It has a beginning and an end, just like a function It has a header containing it's name, also like a function but without arguments There can be any number of statements between its beginning and end, like a function You can use a function to jump to its beginning from anywhere (even itself) and it will execute the statements contained in it until it reaches its end You can use a function to immediately stop the execution of its contents and jump back where it was called from The code it contains is in the same scope as everything else, so you can access all variables outside and create new ones which aren't deleted upon leaving the construct. All in all it is like a goto point with an end and the option to return where it was called from.

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• Storing images in a Microsoft SQL Server 2005 database

  - by Rekreativc

  Hello! I have a question about storing an image in a database. I know this topic has been discussed before, however I feel that in my case this is actually a good idea - the images will be small (none should be as large as 1MB) and there shouldn't be too many. I like the idea of not worrying about IO permissions etc. Anyway I have a problem when storing the image (byte[]) to the database type image. Here is my code: OleDbCommand comm = new OleDbCommand(strSql, Program.GetConnection()); comm.Parameters.Add("?", SqlDbType.Image).Value = bytearr; comm.ExecuteNonQuery(); Everything compiles fine, however when I run it, the code only saves the value 63 (0x3F) into the field - no matter which image I am trying to save. What could be the problem? Thank you for your help.

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