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• Unit Testing Model Classes that inherits from NSManagedObject

  - by Matt Baker

  So...I'm trying to get unit tests set up in my iPhone App but I'm having some issues. I'm trying to test my model classes but they inherit directly from NSManagedObject. I'm sure this is a problem but I don't know how to get around it. Everything is building and running as expected but I get this error when calling any method on the class I'm testing: Unknown.m:0:0 unrecognized selector sent to instance 0xc2b120 If I follow this structure (http://chanson.livejournal.com/115621.html) to create my object in my tests I end up with another error entirely but it still doesn't help me. Basically my question is this: how can I test a class that inherits from NSManagedObject?

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• Determining the angle to fire a shot when target and shooter moves, and bullet moves with shooter velocity added in

  - by Azaral

  I saw this question: Predicting enemy position in order to have an object lead its target and followed the link in the answer to stack overflow. In the stack overflow page I used the 2nd answer, the one that is a large mathematical derivation. My situation is a little different though. My first question though is will the answer provided in the stack overflow page even work to begin with, assuming the original circumstances of moving target and stationary shooter. My situation is a little different than that situation. My target moves, the shooter moves, and the bullets from the shooter start off with the velocities in x and y added to the bullets' x and y velocities. If you are sliding to the right, the bullets will remain in front of you as you move so as long as your velocity remains constant. What I'm trying to do is to get the enemy to be able to determine where they need to shoot in order to hit the player. Unless the player and enemy is stationary, the velocity from the ship adding to the velocity of the bullets will cause a miss. I'd rather like to prevent that. I used the formula in the stack overflow answer and did what I thought were the appropriate adjustments. I've been banging at this for the last four hours and I just can't make it click. It is probably something really simple and boneheaded that I am missing (that seems to be a lot of my problems lately). Here is the solution presented from the stack overflow answer: It boils down to solving a quadratic equation of the form: a * sqr(x) + b * x + c == 0 Note that by sqr I mean square, as opposed to square root. Use the following values: a := sqr(target.velocityX) + sqr(target.velocityY) - sqr(projectile_speed) b := 2 * (target.velocityX * (target.startX - cannon.X) + target.velocityY * (target.startY - cannon.Y)) c := sqr(target.startX - cannon.X) + sqr(target.startY - cannon.Y) Now we can look at the discriminant to determine if we have a possible solution. disc := sqr(b) - 4 * a * c If the discriminant is less than 0, forget about hitting your target -- your projectile can never get there in time. Otherwise, look at two candidate solutions: t1 := (-b + sqrt(disc)) / (2 * a) t2 := (-b - sqrt(disc)) / (2 * a) Note that if disc == 0 then t1 and t2 are equal. If there are no other considerations such as intervening obstacles, simply choose the smaller positive value. (Negative t values would require firing backward in time to use!) Substitute the chosen t value back into the target's position equations to get the coordinates of the leading point you should be aiming at: aim.X := t * target.velocityX + target.startX aim.Y := t * target.velocityY + target.startY Here is my code, after being corrected by Sam Hocevar (thank you again for your help!). It still doesn't work. For some reason it never enters the section of code inside the if(disc = 0) (obviously because it is always less than zero but...). However, if I plug the numbers from my game log on the enemy and player positions and velocities it outputs a valid firing solution. I have looked at the code side by side a couple of times now and I can't find any differences. There has got to be something simple I'm missing here. If someone else could look at this code and determine what is going on here I'd appreciate it. I know it's not going through that section because if it were, shouldShoot would become true and the enemy would be blasting away at the player. This section calls the function in question, CalculateShootHeading() if(shouldMove) { UseEngines(); } x += xVelocity; y += yVelocity; CalculateShootHeading(); if(shouldShoot) { ShootWeapons(); } UpdateWeapons(); This is CalculateShootHeading(). This is inside the enemy class so x and y are the enemy's x and y and the same with velocity. One output from my game log gives Player X = 2108, Player Y = -180.956, Player X velocity = 10.9949, Player Y Velocity = -6.26017, Enemy X = 1988.31, Enemy Y = -339.051, Enemy X velocity = 1.81666, Enemy Y velocity = -9.67762, 0 enemy projectiles. The output from the console tester is Bullet position = 2210.49, -239.313 and Player Position = 2210.49, -239.313. This doesn't make any sense. The only thing that could be different is the code or the input into my function in the game and I've checked that and I don't think that it is wrong as it's updated before this and never changed. float const bulletSpeed = 30.f; float const dx = playerX - x; float const dy = playerY - y; float const vx = playerXVelocity - xVelocity; float const vy = playerYVelocity - yVelocity; float const a = vx * vx + vy * vy - bulletSpeed * bulletSpeed; float const b = 2.f * (vx * dx + vy * dy); float const c = dx * dx + dy * dy; float const disc = b * b - 4.f * a * c; shouldShoot = false; if (disc >= 0.f) { float t0 = (-b - std::sqrt(disc)) / (2.f * a); float t1 = (-b + std::sqrt(disc)) / (2.f * a); if (t0 < 0.f || (t1 < t0 && t1 >= 0.f)) { t0 = t1; } if (t0 >= 0.f) { float shootx = vx + dx / t0; float shooty = vy + dy / t0; heading = std::atan2(shooty, shootx) * RAD2DEGREE; } shouldShoot = true; }

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• jquery adding in select list by textbox

  - by mazhar

  ok what i am trying to do is to add something in the textbox and after pressing the add button it should go into the select list. how would i do that with jquery? I am not really able to make it work by your method .Please help? What i am doing wrong <%= Html.ListBox("FeatureLists", ViewData["FeatureListListBox"] as MultiSelectList)% $("#add").click(function() { var val = $("#txtaddfeature").val(); alert("aaa"); $("", { 'value': val, text: val }).appendTo("#FeatureLists"); //$("#textbox").val(''); here if you want to clear the value for next time });

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• Passing markup into a Rails Partial

  - by 1ndivisible

  Is there any way of doing something equivilant to this: <%= render partial: 'shared/outer' do %> <%= render partial: 'shared/inner' %> <% end %> Resulting in <div class="outer"> <div class="inner"> </div> </div> Obviously there would need to be a way of marking up 'shared/outer.html.erb' to indicate where the passed in partial should be rendered: <div class="outer"> <% render Here %> </div>

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• jquery not printing the image in IE 6

  - by pradeep

  if(count > 0){ for(var i= parseInt(start); i < parseInt(count); i++) { link ='<a href="/diabetes/ropimages/origpicdisplay.php?pid='+pid+'&rid='+i+'" target="_blank"><img src="/diabetes/ropimages/thumbpicdisplay.php?pid='+pid+'&rid='+i+'"/><a>&nbsp;&nbsp;'; if(i > start){ $("#content1").append(link);} else{ $("#content1").empty().html(link);} } } i use code like this. it does print images in FF but not in IE6 any solutions for this ?

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• I cant browse php pages in my local server

  - by tibin mathew

  Hi, I cant browse php pages in my local server.Before it was working fine. But now i cant browse php pages, i can browse html pages and asp pages , no problems with that. But when i try to browse a php page its not loading. What will be the problem?? I am using windows 2000 advanced server and my web server is Tomcat please someone help me Guys i'm not getting anything in my browser, its just continue to loading Nothing showing in that page i'm not getting any 404 error or anything like that. its just continue to be loading

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• Whats the python way for recursively setting file permissions?

  - by Geoff

  What's the "python way" to recursively set the owner and group to files in a directory? I could just pass a 'chown -R' command to shell, but I feel like I'm missing something obvious. I'm mucking about with this: import os path = "/tmp/foo" for root, dirs, files in os.walk(path): for momo in dirs: os.chown(momo, 502, 20) This seems to work for setting the directory, but fails when applied to files. I suspect the files are not getting the whole path, so chown fails since it can't find the files. The error is: 'OSError: [Errno 2] No such file or directory: 'foo.html' What am I overlooking here?

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• Using mercurial for web-design version control (dealing with images)

  - by Acorn

  I'm very new to Version Control, and I was wondering if I could get some advice on how it can fit into website design. At the moment I'm working on a typical, simple website that includes images: A few .html files and a .css file One folder full of photographs Another folder with the corresponding thumbnails Can I just put the whole lot in a repository? Or is there a better way I could apply Version Control to it? How should I deal with the images? edit: How well will it work with changes to the images? What if I decide to try and optimise my photographs or resize them. I wont be able to see what exactly changed about the images, should comments be enough to keep track of that?

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• How to hide nested form from jQuery under IE8

  - by pduel

  An html segment with a div containing a form: <div class="hide"> Form header <form action='' method='post'> .... form content here </form> form footer </div> <script type="text/javascript"><!--// $(document).ready(function() { $('.hide').hide(); } //--></script> The jquery should hide the form, but does not do so under IE8. (version 8.0.60001) The form content gets hidden, as does the content within the class='hide' div but outside the form, but the form border continues to show, and retains its size. Does anybody have a workaround for this? jQuery is version 1.4.2 I tried to create a small problem demo in jsfiddle, but that site was not functional in the IE browser.

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• Firefox window.parent.location

  - by Mustafa Magdy

  I've a Html page index.htm which has an iframe to page search.htm the search.htm has code like this function executeSearch() { window.parent.location = "/SearchResults.aspx?t=" + txt_Search.value; } this code executed now from index.htm page and it works great on IE and Chrome, but not FireFox ... is there any work around ?? I tried window.parent.location.href, window.opener.location, window.parent.document.location ... but nothing of those worked. after searching the web i found some one with similar prob he said that this is a security settings in Firefox ... is this true?? and if so is there any workaround ?

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• req.getParameter returns values wrong character encoding

  - by coder247

  I'm trying to get values from a JSP using getParameter which includes ü,é,à etc. But get wrong values in servlet. I've checked the content type with firebug and found that Content-Type text/html;charset=UTF-8 checked the POST section with firebug and found the correct value there, when I try to access it in servlet it is wrong. Gives ö instead of ö req.getCharacterEncoding(); returns null. Tried with setting req.setCharacterEncoding("UTF-8"); at the beginning of servlet but didn't help.

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• how do i specify the element when loading content ajax jquery

  - by phukkie

  How can I specify an element where the content is to be retrieved from within the pageurl in the code below? $(function () { $("a[rel='sort']").click(function (e) { //e.preventDefault(); /* if uncomment the above line, html5 nonsupported browers won't change the url but will display the ajax content; if commented, html5 nonsupported browers will reload the page to the specified link. */ //get the link location that was clicked pageurl = $(this).attr('href'); //to get the ajax content and display in div with id 'content' $.ajax({ url: pageurl + '?rel=sort', success: function (data) { $('#content1').html(data); } }); //to change the browser URL to 'pageurl' if (pageurl != window.location) { window.history.pushState({ path: pageurl }, '', pageurl); } return false; }); });

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• Embedded Google Earth Plug-Ins no longer working

  - by user1497162

  I really hope someone can help me. I just noticed that none of my website's Google Earth embedded plug-in's work anymore (in Safari, Chrome or Firefox)  All you can see now is blank space and small text that says "Information is temporarily unavailable." I have no idea why they would no longer be working.  Nothing has changed whatsoever. Example here: http://www.grandcanyonvirtualtour.com/_tours/phantom_ranch.html Any suggestions greatly appreciated!! Please note, I am not a coder -- I am a photographer who is learning how to integrate photographs into maps, so I apologize if any questions are elementary. Thanks, Sara I am on a MacBook Pro 2.4 GHz Intel Core i7; OS 10.7.4

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• Using Angularjs with server side templates

  - by codecollision

  For SEO purposes the server renders out the full html template for a given URL on initial load. The site uses angularjs which detects the URL route and renders a client template from the JSON API. For example, you navigate to: /blog/post-title Server responds with post-title content. Angular loads, detects route: /blog/:post_slug and begins to load JSON and render client side template from response. Obviously what Angular does is fine when links are followed after the initial load, but on first load it duplicates effort. My question is if there is a clean way to prevent this situation.

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• Codebase for making a Flash-based interactive map with SVG vector data?

  - by Mike

  I'm looking for a way to take SVG path info (basically a string of coordinates) and dynamically draw it with Actionscript. Icing on the cake would be if those shapes could detect mouse events to trigger JS and dynamically change their appearance (fill, stroke, etc...). I'm currently trying something similar to this (http://raphaeljs.com/australia.html) using SVG but it's just too slow in IE. I've also tried Google's SVG Web (http://code.google.com/p/svgweb/) which basically does exactly what I'm looking for (it converts SVG to Flash in IE) but again, it's sloooooow - which is why I'm considering doing the whole shebang in Flash. Anyone know of some links to point me in the right direction?

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• Canvas is stretch when using CSS but normal with old "width" and "height" properties

  - by Sirber

  I have 2 canvas, one use old html "width" and "height" to size it, the other use CSS <canvas id="compteur1" width="300" height="300" onmousedown="compteurClick(this.id);"></canvas> <canvas id="compteur2" style="width: 300px; height: 300px;" onmousedown="compteurClick(this.id);"></canvas> compteur1 display like it should, but not compteur2. the content is drawn using javascript on a 300x300 canvas. why is there a display difference? Thanks! Screenshot:

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• PHP: URL detection (regexp) includes line breaks

  - by marco92w

  I want to have a function which gets a text as the input and gives back the text with URLs made to HTML links as the output. My draft is as follows: function autoLink($text) { return preg_replace('/https?:\/\/[\S]+/i', '<a href="\0">\0</a>', $text); } But this doesn't work properly. For the input text which contains ... http://www.google.de/ ... I get the following output: <a href="http://www.google.de/<br">http://www.google.de/<br</a> /> Why does it include the line breaks? How could I limit it to the real URL? Thanks in advance!

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• DOM class injection in PHP

  - by Adam Kiss

  idea Via jQuery, I was able to mark all :first-child and :last-child elements in document (well, almost all :)) with class first which could I later style (i.e. first li in ul#navigation would be easily adressable as ul#navigation .first). I used following code: var $f = $('*:first-child') $f.addClass('first'); var $l = $('body *:last-child') $l.addClass('last'); question Now, my question is if it's possible to do the same via php, so non-JS users/gadgets could have the same effects and additional styling and also it would be less overkill on browser. So, is it possible to capture output, parse it as html and inject this class easily in php?

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• Cannot move ckeditor 4 selection to beginning

  - by Gary Hillerson

  I've been exploring numerous solutions in stackoverflow and elsewhere to try to get ckeditor 4 to scroll to the top after I've programmatically added a number of pages to it, using CKEditor's InsertHtml function. After adding my html, which looks fine, I want to position the cursor at the beginning. Here's one of a variety of things I've tried without success: function MoveCaretToStart(myEditor) { var range = new CKEDITOR.dom.range( editor.document ); range.selectNodeContents(editor.document.getBody()); range.moveToElementEditStart(range.root); // also tried range.collapse(true); range.select(); } ... MoveCaretToStart(CKEDITOR.instances['myEditor']); // which already has contents in it This doesn't throw any errors, but also doesn't move the cursor position (it remains at the end of the doc). I thought this one would be easy, but it sure hasn't been. Any help appreciated.

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• .pl or .cgi for perl web script file

  - by Nano HE

  HI. I created two files 'hello.pl' and 'hello.cgi' with the code below. #!/usr/bin/perl print "Content-type:text/html\n\n"; print "hello world"; I can view the page via both http://www.mydomain.com/cgi-bin/hello.pl and http://www.mydomain.com/cgi-bin/hello.cgi. Which one is more sense in Perl web dev? BTW, the directory of 'cgi-bin' created by my VPS server, Do I need contact with my VPS support to remove it or just remain it like this URL style? Maybe http://www.mydomain.com/perDev/hello.cgi is better?

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• Is it possible to use jquery to add numbers taken from mysql?

  - by Scarface

  Hey guys quick question. I have a div that gets assigned a number to its id that is taken from the database on page load. I am trying to use jquery to add 1 to that number but for example if the number was 70 to begin with it just becomes 701. Anyone know what I am doing wrong? echo "<div class=\"total\" id=\"$total\">$total</div>"; var total=$(".total").attr("id"); var newtotal=total+1; $('.total').html(newtotal);

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• How to pass an asp.net control to a jQuery ajax call?

  - by Abe Miessler

  I have the following jQuery event that gets fired every time an anchor is clicked. How can I pass a asp.net control (lets say a textbox called "tb_name") as one of the parameters, in addition to the "target" parameter i'm already passing? <script type="text/javascript"> $(document).ready(function() { $("a").click(function(event) { $.ajax({ type: "POST", url: "Default.aspx/Click", data: "{target:'" + event.target + "'}", contentType: "application/json; charset=utf-8", dataType: "json", error: function(xhr, ajaxOptions, thrownError) { alert(xhr.responseText); $("#myContent").html(xhr.statusText); //alert(xhr.responseText); }, success: function(msg) { alert(msg.d); } }); return false; }) }) </script>

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• Firefox doesn't show silverlight controls

  - by lmenaria

  I have a silverlight application in which I am using the windowless property to show text . Silverlight Plugin Size is 1000*2000, I Have a button (siverlight control) on the Top. I am showing some html text using DIV real time. Its working fine. My Silverlight Plugin & DIV both style property is= "position:absolute'. This application is working fine in IE, but When I run this application in Firefox Button doesn't dsiplayed. Please let me know whats a issue with Firefox ? Thanks in advance, Laxmilal

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• Google account: Can retrieve the picture from openid? Can I get it with OAuth to google?

  - by Jonathan

  Hi! I need to retrieve the name, email and picture from a google account. I am already using the openid to make the user login with it's google acc. Can I have the picture URL from the openid proccess? with OAuth I cant'seem to find the right scope to retrieve this information... See this link: http://code.google.com/apis/gdata/docs/directory.html there is a list of scopes that you can fetch with REST api to google and I didnt't see the one related to the profile. Btw, I am using PHP and the openid is already working, but didn't start with the oauth untill I know if I can(and need) retrieve the picture (because email and name already comes within the openid proccess) thanks, Joe

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• Wrapping Multiple Elements (jQuery)

  - by Nimbuz

  I've this piece of HTML: div.content div.one content div.two content div.three content I want to add two divs on top and bottom and wrap one div around it so it becomes: div.top div.wrapper div.content div.one content div.two content div.three content div.bottom I'm aware of the several wrap selectors (innerWrap, wrapAll etc..) but I'm not sure how to wrap 2 divs. The following jQuery might work, but is there a better way to write it? $('content').wrap('<div class="wrapper"></div'); $('.wrapper').before('<div class="top"></div>'); $('.wrapper').after('<div class="bottom"></div>');

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