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  • Generic type in generic collection

    - by Brian Triplett
    I have generic type that looks like: public class GenericClass<T, U> where T : IComparable<T> { // Class definition here } I then have a collection of these instances. What is the cleanest way to pass through the type constraints? public class GenericCollection<V> where V : GenericClass<T, U> // This won't compile { private GenericClass<T, U>[] entries; public V this[index] { get{ return this.entries[index]; } } } Is there perhaps a better way to design this? I think that specifying GenericCollection<T, U, V> where V : GenericClass<T, U> seems awkward. Might be my only option though....

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  • Is using GET with a tokenID for security a good idea?

    - by acidzombie24
    I was thinking about this and it appears POST only a little less vulnerable and somewhat harder (do to requiring the user to click something). I read about token ids and double submitted cookies and i am not sure what the difference is http://www.owasp.org/index.php/Cross-Site_Request_Forgery_%28CSRF%29_Prevention_Cheat_Sheet#Disclosure_of_Token_in_URL http://www.owasp.org/index.php/Cross-Site_Request_Forgery_%28CSRF%29_Prevention_Cheat_Sheet#Double_Submit_Cookies Right now i have the user id (PK in my table) and a session id so you cant simply change your cookie ID and act like someone else. Now it seems like i put the session id as a token in each of my forms and check them bc attackers cant guess these tokens. However i dislike the idea of putting the session id into the page for ppl to see. But really, is there a problem with that? short of having the user copy/pasting the html is there any attacks that can happen due to the session id being in plain view in html?

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  • Designing a WPF map control.

    - by Dylan
    I'm thinking about making a simple map control in WPF, and am thinking about the design of the basic map interface and am wondering if anyone has some good advice for this. What I'm thinking of is using a ScrollViewer (sans scroll bars) as my "view port" and then stacking everything up on top of a canvas. From Z-Index=0 up, I'm thinking: Base canvas for lat/long calculations, control positioning, Z-Index stacking. Multiple Grid elements to represent the maps at different zoom levels. Using a grid to make tiling easier. Map objects with positional data. Map controls (zoom slider, overview, etc). Scroll viewer with mouse move events for panning and zooming. Any comments suggestions on how I should be building this?

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  • Is there a SortedList<T> class in .net ? (not SortedList<Key,Value> which is actually a kind of Sort

    - by Brann
    I need to sort some objects according to their contents (in fact according to one of their properties, which is NOT the key and may be duplicated between different objects) .net provides two classes (SortedDictionnary and SortedList), and both are some kind of Dictionaries. The only difference (AFAIK) is that SortedDictionnary uses a binary tree to maintain its state whereas SortedList does not and is accessible via an index. I could achieve what I want using a List, and then using its Sort() method with a custom implementation of IComparer, but it wouldn't be time-efficient as I would sort the whole List each time I insert a new object, whereas a good SortedList would just insert the item at the right position. What I need is a SortedList class with a RefreshPosition(int index) to move only the changed (or inserted) object rather than resorting the whole list each time an object inside changes. Am I missing something obvious ?

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  • How to get an ASP.NET MVC Ajax response to redirect to new page instead of inserting view into Updat

    - by Jeff Widmer
    I am using the Ajax.BeginForm to create a form the will do an ajax postback to a certain controller action and then if the action is successful, the user should get redirected to another page (if the action fails then a status message gets displayed using the AjaxOptions UpdateTargetId). using (Ajax.BeginForm("Delete", null, new { userId = Model.UserId }, new AjaxOptions { UpdateTargetId = "UserForm", LoadingElementId = "DeletingDiv" }, new { name = "DeleteForm", id = "DeleteForm" })) { [HTML DELETE BUTTON] } If the delete is successful I am returning a Redirect result: [Authorize] public ActionResult Delete(Int32 UserId) { UserRepository.DeleteUser(UserId); return Redirect(Url.Action("Index", "Home")); } But the Home Controller Index view is getting loaded into the UpdateTargetId and therefore I end up with a page within a page. Two things I am thinking about: Either I am architecting this wrong and should handle this type of action differently (not using ajax). Instead of returning a Redirect result, return a view which has javascript in it that does the redirect on the client side. Does anyone have comments on #1? Or if #2 is a good solution, what would the "redirect javascript view" look like?

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  • Complex sound handling (I.E. pitch change while looping)

    - by Matthew
    Hi everyone I've been meaning to learn Java for a while now (I usually keep myself in languages like C and Lua) but buying an android phone seems like an excellent time to start. now after going through the lovely set of tutorials and a while spent buried in source code I'm beginning to get the feel for it so what's my next step? well to dive in with a fully featured application with graphics, sound, sensor use, touch response and a full menu. hmm now there's a slight conundrum since i can continue to use cryptic references to my project or risk telling you what the application is but at the same time its going to make me look like a raving sci-fi nerd so bare with me for the brief... A semi-working sonic screwdriver (oh yes!) my grand idea was to make an animated screwdriver where sliding the controls up and down modulate the frequency and that frequency dictates the sensor data it returns. now I have a semi-working sound system but its pretty poor for what its designed to represent and I just wouldn't be happy producing a sub-par end product whether its my first or not. the problem : sound must begin looping when the user presses down on the control the sound must stop when the user releases the control when moving the control up or down the sound effect must change pitch accordingly if the user doesn't remove there finger before backing out of the application it must plate the casing of there device with gold (Easter egg ;P) now I'm aware of how monolithic the first 3 look and that's why I would really appreciate any help I can get. sorry for how bad this code looks but my general plan is to create the functional components then refine the code later, no good painting the walls if the roofs not finished. here's my user input, he set slide stuff is used in the graphics for the control @Override public boolean onTouchEvent(MotionEvent event) { //motion event for the screwdriver view if(event.getAction() == MotionEvent.ACTION_DOWN) { //make sure the users at least trying to touch the slider if (event.getY() > SonicSlideYTop && event.getY() < SonicSlideYBottom) { //power setup, im using 1.5 to help out the rate on soundpool since it likes 0.5 to 1.5 SonicPower = 1.5f - ((event.getY() - SonicSlideYTop) / SonicSlideLength); //just goes into a method which sets a private variable in my sound pool class thing mSonicAudio.setPower(1, SonicPower); //this handles the slides graphics setSlideY ( (int) event.getY() ); @Override public boolean onTouchEvent(MotionEvent event) { //motion event for the screwdriver view if(event.getAction() == MotionEvent.ACTION_DOWN) { //make sure the users at least trying to touch the slider if (event.getY() > SonicSlideYTop && event.getY() < SonicSlideYBottom) { //power setup, im using 1.5 to help out the rate on soundpool since it likes 0.5 to 1.5 SonicPower = 1.5f - ((event.getY() - SonicSlideYTop) / SonicSlideLength); //just goes into a method which sets a private variable in my sound pool class thing mSonicAudio.setPower(1, SonicPower); //this handles the slides graphics setSlideY ( (int) event.getY() ); //this is from my latest attempt at loop pitch change, look for this in my soundPool class mSonicAudio.startLoopedSound(); } } if(event.getAction() == MotionEvent.ACTION_MOVE) { if (event.getY() > SonicSlideYTop && event.getY() < SonicSlideYBottom) { SonicPower = 1.5f - ((event.getY() - SonicSlideYTop) / SonicSlideLength); mSonicAudio.setPower(1, SonicPower); setSlideY ( (int) event.getY() ); } } if(event.getAction() == MotionEvent.ACTION_UP) { mSonicAudio.stopLoopedSound(); SonicPower = 1.5f - ((event.getY() - SonicSlideYTop) / SonicSlideLength); mSonicAudio.setPower(1, SonicPower); } return true; } and here's where those methods end up in my sound pool class its horribly messy but that's because I've been trying a ton of variants to get this to work, you will also notice that I begin to hard code the index, again I was trying to get the methods to work before making them work well. package com.mattster.sonicscrewdriver; import java.util.HashMap; import android.content.Context; import android.media.AudioManager; import android.media.SoundPool; public class SoundManager { private float mPowerLvl = 1f; private SoundPool mSoundPool; private HashMap mSoundPoolMap; private AudioManager mAudioManager; private Context mContext; private int streamVolume; private int LoopState; private long mLastTime; public SoundManager() { } public void initSounds(Context theContext) { mContext = theContext; mSoundPool = new SoundPool(2, AudioManager.STREAM_MUSIC, 0); mSoundPoolMap = new HashMap<Integer, Integer>(); mAudioManager = (AudioManager)mContext.getSystemService(Context.AUDIO_SERVICE); streamVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC); } public void addSound(int index,int SoundID) { mSoundPoolMap.put(1, mSoundPool.load(mContext, SoundID, 1)); } public void playUpdate(int index) { if( LoopState == 1) { long now = System.currentTimeMillis(); if (now > mLastTime) { mSoundPool.play(mSoundPoolMap.get(1), streamVolume, streamVolume, 1, 0, mPowerLvl); mLastTime = System.currentTimeMillis() + 250; } } } public void stopLoopedSound() { LoopState = 0; mSoundPool.setVolume(mSoundPoolMap.get(1), 0, 0); mSoundPool.stop(mSoundPoolMap.get(1)); } public void startLoopedSound() { LoopState = 1; } public void setPower(int index, float mPower) { mPowerLvl = mPower; mSoundPool.setRate(mSoundPoolMap.get(1), mPowerLvl); } } ah ha! I almost forgot, that looks pretty ineffective but I omitted my thread which actuality updates it, nothing fancy it just calls : mSonicAudio.playUpdate(1); thanks in advance, Matthew

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  • Facebook API: How to let the php knows whether the user is a fan of the application or not?

    - by Unreality
    Facebook API: How to let the php knows whether the user is a fan of the application or not? Plan 1: failed is displayed at the html level only.. .it won't let the php level knows whether the user is a fan or not Plan 2: failed has got the same problem too Plan 3: failed fql permission table simply lacked the field of is_fan http://wiki.developers.facebook.com/index.php/Permissions_%28FQL%29 Plan 4: server lag calling restful API http://wiki.developers.facebook.com/index.php/Pages.isFan will bring a lot of lag to server... and I wonder if it can works on application page too. any suggestion to solve this problem?

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  • include_once fails!

    - by user220201
    Hi, I am new to php. I thought I knew enough but apparently do not. I am trying to use the OAuth.php from code.google.com. So I include OAuth.php in my code. Here is my php file - index.php <?php print 'Hello1'; include 'test.php'; print 'Hello2'; include 'OAuth.php'; print 'Hello3'; ?> Here test.php, OAuth.php and index.php are all in the same directory. Amazingly enough, I see Hello1 and Hello2 but not Hello3. What am I missing. Its driving me crazy. Any help is greatly greatly appreciated. I am using php5 with apache 2.2 and also have the oauth.so module installed and loaded from php.net. SV

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  • Route Links - Url.Action

    - by Jemes
    I'm trying to return my links so they display as /Area_1419.aspx/2/1. I've managed to get that result in example 2 but I don't understand why it works, as I would exspect example 1 below to work. I don't see how Example 2 knows to go to the Area_1419 controller? Route routes.MapRoute( "Area_1419 Section", "Area_1419.aspx/{section_ID}/{course_ID}", new { controller = "Home", action = "Index" } ); Links Example 1 <a href='<%=Url.Action("Area_1419", new { section_ID="2", course_ID="1" })%>'><img .../></a> Returns: /Home.aspx/Area_1419?section_ID=2&course_ID=1 Links Example 2 <a href='<%=Url.Action("index", new { section_ID="2", course_ID="1" })%>'><img .../></a> Returns: /Area_1419.aspx/2/1

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  • jQuery gallery turn over with next and previous buttons

    - by Ralf
    Hi, i'm trying to do some kind of Gallery-Turn Over Script with jQuery. Therefor i got an array with - let's say 13 - images: galleryImages = new Array( 'images/tb_01.jpg', 'images/tb_02.jpg', 'images/tb_03.jpg', 'images/tb_04.jpg', 'images/tb_05.jpg', 'images/tb_06.jpg', 'images/tb_07.jpg', 'images/tb_08.jpg', 'images/tb_09.jpg', 'images/tb_10.jpg', 'images/tb_11.jpg', 'images/tb_12.jpg', 'images/tb_13.jpg' ); My gallery looks like a grid showing only 9 images at once. My current script already counts the number of li-elements in #gallery, loads the first 9 images and displays them. The HTML looks like this: <ul id="gallery"> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> </ul> <ul id="gallery-controls"> <li id="gallery-prev"><a href="#">Previous</a></li> <li id="gallery-next"><a href="#">Next</a></li> </ul> I'm pretty new to jQuery an my problem is that i can't figure out how to split the array in portions with 9 elements to attach it as a link on the control buttons. I need something like this: $('#gallery-next').click(function(){ $('ul#gallery li').children().remove(); $('ul#gallery li').each(function(index,el){ var img = new Image(); $(img).load(function () { $(this).css('display','none'); $(el).append(this); $(this).fadeIn(); }).attr('src', galleryImages[index]); //index for the next 9 images?!?! }); }); Thanks for help!

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  • How to Change the url of the page when jquery ui tabs is clicked

    - by Aakash Chakravarthy
    Hello, I have jquery tabs list like <ul id="tabsList"> <li><a href="#tab-1">TAB 1</a></li> <li><a href="#tab-2">TAB 2</a></li> <li><a href="#tab-3">TAB 3</a></li> </ul> and contents for it like <div id="tab-1">...</div>, <div id="tab-2">...</div>, <div id="tab-3">...</div> When the tab is clicked, the tab changes correctly. But i want the id of the tabs be in the url. i.e when tab 2 is clicked, the URL should change to http://example.com/index.htm#tab-2 when tab 1 is clicked, the URL should change to http://example.com/index.htm#tab-1 How to do this ?

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  • Can documents indexed with Solr on JDK6 be retrieved using only lucene api on JDK1.4?

    - by huynhjl
    My runtime environment is still on JDK1.4 but I like the Solr features related to how documents are ingested and indexed. Would I be able to index my documents using Solr offline on a recent version of the JDK, copy the index over and use it in my runtime environment with an older version of the JDK? Version wise, Solr 1.4.0 uses Apache Lucene 2.9.1 which is JDK1.4 compatible. (but Solr itself requires JDK5). Assuming what I'm trying to do is even possible, what features would I lose if I search Solr indices only with the Lucene API?

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  • Box Shadow on only 3 sides

    - by Connor
    I have two overlapping divs that have css3 box shadows. The trouble is that even when I set the z-index I will still need to eliminate one of the div's box-shadow. I have seen cases where negative spreads and zero values are used but I don't think that would work here. The code I have now is: #bulb-top { position: relative; width: 280px; height: 280px; background-color: #E5F7A3; -webkit-border-radius: 280px; -moz-border-radius: 280px; border-radius: 280px; border: 8px solid #FFF40C; top: -430px; margin-left: auto; margin-right: auto; -webkit-box-shadow: 0px 0px 15px 1px #FFF40C; -moz-box-shadow: 0px 0px 15px 1px #FFF40C; box-shadow: 0px 0px 15px 1px #FFF40C; z-index: 4; } #bulb-bottom { position: relative; width: 140px; height: 120px; background-color: #E5F7A3; -moz-border-radius-topleft: 0px; -moz-border-radius-topright: 0px; -moz-border-radius-bottomright: 30px; -moz-border-radius-bottomleft: 30px; -webkit-border-radius: 0px 0px 30px 30px; border-radius: 0px 0px 30px 30px; border-left: 8px solid #FFF40C; border-right: 8px solid #FFF40C; border-bottom: 8px solid #FFF40C; top: -455px; margin-left: auto; margin-right: auto; -webkit-box-shadow: 0px 0px 15px 1px #FFF40C; -moz-box-shadow: 0px 0px 15px 1px #FFF40C; box-shadow: 0px 0px 15px 1px #FFF40C; z-index: 5; } http://jsfiddle.net/minitech/g42vq/3/

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  • Need Help on OAuthException Code 2500

    - by Deepak
    I am trying to develop an Facebook application (apps.facebook.com/some_app) using PHP where I need to present some information based on user's music interests. I found that its under "user_likes games". My problems are as follows: To gain access, I have implemented the oauth dialog method as suggested in API in my index page. $auth_url = "http://www.facebook.com/dialog/oauth?client_id=" . $app_id . "&redirect_uri=" . urlencode($canvas_page) ."&scope=user_likes"; After successful authorization I come back to index page with "code" as parameters. http://MY_CANVAS_PAGE/?code=some base64 encoded letters Firstly I don't know if I need access_token just to read user's music interests but I have tried all the methods suggested. I couldn't move forward from this point I have a code like this (in my index page), which redirects for authorization if code parameters is not set. if(empty($code) && !isset($_REQUEST['error'])) { $_SESSION['state'] = md5(uniqid(rand(), TRUE)); //CSRF protection echo("<script> top.location.href='" . $auth_url . "'</script>"); } Currently I am just trying to get user's public information here but with no success. I have tried the signed_request method as suggested but no success $signed_request = $_REQUEST["signed_request"]; list($encoded_sig, $payload) = explode('.', $signed_request, 2); $data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true); echo ("Welcome User: " . $data["user_id"]); Also tried the code found in http://developers.facebook.com/blog/post/500/ but I am getting error when trying to get the debug info using print_r($decoded_response); stdClass Object ( [error] => stdClass Object ( [message] => An active access token must be used to query information about the current user. [type] => OAuthException [code] => 2500 ) ) To get user's public info, I have tried also the suggested example in PHP SDK $facebook = new Facebook(array( 'appId' => MY_APP_ID, //registered facebook APP ID 'secret' => MY_SECRET, //secret key for APP )); $fb_user = $facebook->getUser(); if($fb_user){ try { $user_profile = $facebook->api('/me'); echo $user_profile['email']; } catch(FacebookApiException $e) { $fb_user = null; } } But no success. Can somebody explain me why I am getting this error and how to access the user's music interest properly. Probably I misunderstood the API. Thanks Deepak

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  • ASP.Net MVC Outbound Route Matching Problem When Using ActionLink

    - by Godders
    Hi there, Hoping for some help after reading into MVC routing and not coming up with the answer myself. I have the following routes registered: public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); routes.MapRoute( null, "YourFeedback/Article/{resourceId}", new { controller = "YourFeedback", action = "Index", contentTypeId = new Guid(ConfigurationManager.AppSettings["ArticleLibraryId"]) }); routes.MapRoute( "Default", // Route name "{controller}/{action}/{id}", // URL with parameters new { controller = "Home", action = "Index", id = "" } // Parameter defaults ); } I have the following ActionLink in an aspx view: <%=Html.ActionLink("Your Feedback", "Article", "YourFeedback", new { resourceId = Model.ContentId.ResourceId }, new { @class = "yourFeedback" })%> My understanding of MVC routing is that this would render a anchor link with href of "/YourFeedback/Article/101" where 101 comes from Model.ContentId.ResourceId. Yet the anchor link href is rendered as "YourFeedback/Article/resourceId=101". Any ideas where I'm going wrong? Thanks in advance.

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  • Drupal htaccess redirect - all files in directory to new directory

    - by hfidgen
    Hiya, I've moved a site to Drupal, but am now getting a lot of 404 errors due to the search engines taking their time to update the indexes. The 404 paths all look similar to this: recipedata/ccp1300006/633_L.jpg recipedata/ccp1500005/risotto.jpg recipedata/ccp1500006/haddock.jpg So I'd like to do some htaccess redirection with mod_rewrite to take care of this lot. All the images DO exist - the path has just changed to /sites/default/files/images/ I've edited a lot of redirects into my htaccess already, but because the ccpXXXXXX directory changes I can't quite figure out the regex. This was my last attempt, but yeah - doesn't work :) Can anyone give me some pointers? RewriteRule ^recipedata/(ccp+)/(.+)$ http://domain.co.uk/sites/default/files/images/$2 [R=301,L] This has to be in the context of the Drupal mod_rewrite rules which already exist <IfModule mod_rewrite.c> RewriteEngine on # Rewrite URLs of the form 'x' to the form 'index.php?q=x'. RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_URI} !=/favicon.ico RewriteRule ^(.*)$ index.php?q=$1 [L,QSA] </IfModule> Thanks!

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  • Routing zend request through a default controller when controller not found.

    - by Brett Pontarelli
    Below is a function defined in my Bootstrap class. I must be missing something fundamental in the way Zend does routing and dispatching. What I am trying to accomplish is simple: For any request /foo/bar/* that is not dispatchable for any reason try /index/foo/bar/. The problem I'm having is when the FooController exists I get Action "foo" does not exist. Basically, the isDispatchable is always false. public function run() { $front = Zend_Controller_Front::getInstance(); $request = $front->getRequest(); $dispatcher = $front->getDispatcher(); //$controller = $dispatcher->getControllerClass($request); if (!$dispatcher->isDispatchable($request)) { $route = new Zend_Controller_Router_Route( ':action/*', array('controller' => 'index') ); $router = $front->getRouter(); $router->addRoute('FallBack', $route); } $front->dispatch(); }

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  • asp.net mvc custom routes with multiple submit buttons

    - by dangerisgo
    So I have a custom route as such: routes.MapRoute( "Wizard", // Route name "Wizard/{page}", // URL with parameters new { controller = "Wizard", action = "Index" } // Parameter defaults ); and have the following on my View: <% Html.BeginForm("Continue", "Wizard"); %> <input type="submit" value="Continue" name="Continue" /> <% Html.EndForm(); %> In which I want to call this function: [AcceptVerbs(HttpVerbs.Post)] public ActionResult Continue(string Number, string Rev) { (...) } but in turn when that button is pressed always calls the postback Index rather than the one I want. If I remove the custom route, it calls my function, but what I want to be displayed in the address bar is: localhost:xxxx/Wizard/1 where the number at the end is the page (div shown) of the wizard either 1, 2, 3, or 4. So is there something I'm missing or can it not be done? Thanks.

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  • HTML wrapper div over embedded flash object cannot be "clickable" by jQuery

    - by Michael Mao
    Hi all: I've been trying to do as the client requested : redirect to campaign page then to destination page once a customer clicks on the top banner in swf format. You can check what's been done at :http://ausdcf.org If you are using Firefox, Chrome or Safari, I suspect you can reach the destination page. However, if you are using IE or Opera, I doubt it. I think to cause of such a weird problem is: The swf ojbects don't have a link to url, SO I have to hack the theme template file like this : <div id="header">'; /* * A quick and dirty way to put some swf into PHP, and rotate among them ... */ //available banners $banners = array( 'http://localhost/smf/flash/banner_fertalign_1.swf', 'http://localhost/smf/flash/banner_fertalign_2.swf', 'http://localhost/smf/flash/banner_fertalign_3.swf' ); //get random banner srand((double) microtime() * 1000000); $rand = rand(0,count($banners)-1); echo '<div id="top_banner_clickable">'; echo '<div id="top_banner_wrapper">'; echo '<object width="400" height="60">'; echo '<param name="wmode" value="transparent">'; echo '<embed wmode="transparent" src="'.$banners[$rand].'" '; echo 'width="400" height="60" type="application/x-shockwave-flash"'; echo 'pluginspage="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash" />'; echo '</object>'; echo '</div>'; echo '</div>'; And the related jQuery code is like this: /* master.js */ $(document).ready(function() { $("#top_banner_clickable").click(function() { window.location ="http://ausdcf.org/campaign/"; }); }); I absolutely know nothing about Flash or embedded objects. I guess that's the cause of this problem. Plus, I don't know why it works with some browsers but not all... I even tried to add a z-index to the wrapper div in css like this: #top_banner_clickable { z-index : 100; } No this wouldn't do, either... Is there a way to go around this issue? Many thanks in advance.

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  • Resolving type parameter values passed to ancester type using reflection

    - by Tom Tucker
    I've asked a similar question before, but this one is much more challenging. How do I find a value of a specific type parameter that is passed to an ancestor class or an interface implemented by one of its ancestor classes using reflection? I basically need to write a method that looks like this. // Return the value of the type parameter at the index passed to the parameterizedClass from the clazz. Object getParameterValue(Class<?> clazz, Class<?> parameterizedClass, int index) For the example below, getParameterValue(MyClass.class, Map.class, 1) would return String.class public class Foo<K, V> implements Map<K, V>{ } public class Bar<V> extends Foo<Integer, V> { } public class MyClass extends Bar<String> { } Thanks!

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  • How to check for palindrome using Python logic

    - by DrOnline
    My background is only a 6 month college class in basic C/C++, and I'm trying to convert to Python. I may be talking nonsense, but it seems to me C, at least at my level, is very for-loop intensive. I solve most problems with these loops. And it seems to me the biggest mistake people do when going from C to Python is trying to implement C logic using Python, which makes things run slowly, and it's just not making the most of the language. I see on this website: http://hyperpolyglot.org/scripting (serach for "c-style for", that Python doesn't have C-style for loops. Might be outdated, but I interpret it to mean Python has its own methods for this. I've tried looking around, I can't find much up to date (Python 3) advice for this. How can I solve a palindrome challenge in Python, without using the for loop? I've done this in C in class, but I want to do it in Python, on a personal basis. The problem is from the Euler Project, great site btw. def isPalindrome(n): lst = [int(n) for n in str(n)] l=len(lst) if l==0 || l==1: return True elif len(lst)%2==0: for k in range (l) ##### else: while (k<=((l-1)/2)): if (list[]): ##### for i in range (999, 100, -1): for j in range (999,100, -1): if isPalindrome(i*j): print(i*j) break I'm missing a lot of code here. The five hashes are just reminders for myself. Concrete questions: 1) In C, I would make a for loop comparing index 0 to index max, and then index 0+1 with max-1, until something something. How to best do this in Python? 2) My for loop (in in range (999, 100, -1), is this a bad way to do it in Python? 3) Does anybody have any good advice, or good websites or resources for people in my position? I'm not a programmer, I don't aspire to be one, I just want to learn enough so that when I write my bachelor's degree thesis (electrical engineering), I don't have to simultaneously LEARN an applicable programming language while trying to obtain good results in the project. "How to go from basic C to great application of Python", that sort of thing. 4) Any specific bits of code to make a great solution to this problem would also be appreciated, I need to learn good algorithms.. I am envisioning 3 situations. If the value is zero or single digit, if it is of odd length, and if it is of even length. I was planning to write for loops... PS: The problem is: Find the highest value product of two 3 digit integers that is also a palindrome.

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  • Pylons and Facebook

    - by Nayan Jain
    The following is my oauth template top.location.href='https://graph.facebook.com/oauth/authorize?client_id=${config['facebook.appid']}&redirect_uri=${config['facebook.callbackurl']}&display=page&scope=publish_stream'; Click here to authorize this application When I hit the page I am prompted to login (desired), upon login I am redirected in a loop between a permissions page and an app page. My controller looks like: class RootController(BaseController): def __before__(self): tmpl_context.user = None if request.params.has_key('session'): access_token = simplejson.loads(request.params['session'])['access_token'] graph = facebook.GraphAPI(access_token) tmpl_context.user = graph.get_object("me") def index(self): if not tmpl_context.user: return render('/oauth_redirect.mako') return render('/index.mako') I'm guessing my settings are off somewhere, probably with the callback. Not to sure if it is an issue with my code or the python sdk for facebook.

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  • How do I create a solr core with the data from an existing one?

    - by steve_d
    Solr 1.4 Enterprise Search Server recommends doing large updates on a copy of the core, and then swapping it in for the main core. I am following these steps: Create prep core: http://localhost:8983/solr/admin/cores?action=CREATE&name=prep&instanceDir=main Perform index update, then commit/optimize on prep core. Swap main and prep core: http://localhost:8983/solr/admin/cores?action=SWAP&core=main&other=prep Unload prep core: http://localhost:8983/solr/admin/cores?action=UNLOAD&core=prep The problem I am having is, the core created in step 1 doesn't have any data in it. If I am going to do a full index of everything and the kitchen sink, that would be fine, but if I just want to update a (large) subset of the documents - that's obviously not going to work. (I could merge the cores, but part of what I'm trying to do is get rid of any deleted documents without trying to make a list of them.) Is there some flag to the CREATE action that I'm missing? The Solr Wiki page for CoreAdmin is a little sparse on details.

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  • ASP .net MVC Invoking default controller and action vs Setting a startup page

    - by SARAVAN
    Hi, I am developing code on the sample ASP .net MVC template provided by VS2010. The first time I ran the code without adding anything, the index.aspx page was invoked which is expected. But for some reasons I added a login.aspx and then accidentally set that as a startup page. Now when I ran the application the default startup url look like http://localhost/Views/login.aspx. I am thinking this is not a valid MVC routing path and I get the requested resource cannot be found error. I am not sure how to revert this back and make sure the default ../home/index is invoked. Can any one throw some light on this? Also should I not set the startup page as we do in asp .net webforms?

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  • Is -1 a magic number? An anti-pattern? A code smell? Quotes and guidelines from authorities

    - by polygenelubricants
    I've seen -1 used in various APIs, most commonly when searching into a "collection" with zero-based indices, usually to indicate the "not found" index. This "works" because -1 is never a legal index to begin with. It seems that any negative number should work, but I think -1 is almost always used, as some sort of (unwritten?) convention. I would like to limit the scope to Java at least for now. My questions are: What are the official words from Sun regarding using -1 as a "special" return value like this? What quotes are there regarding this issue, from e.g. James Gosling, Josh Bloch, or even other authoritative figures outside of Java? What were some of the notable discussions regarding this issue in the past?

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