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• Resources for memory management in embedded application

  - by Elazar Leibovich

  How should I manage memory in my mission critical embedded application? I found some articles with google, but couldn't pinpoint a really useful practical guide. The DO-178b forbids dynamic memory allocations, but how will you manage the memory than? preallocate everything in advance and send a pointer to each function that needs allocation? Allocate it on the stack? Use a global static allocator (but then it's very similar to dynamic allocation)? Answers can be of the form of regular answer, reference to a resource, or reference to good opensource embedded system for example. clarification: The issue here is not whether or not memory management is availible for the embedded system. But what is a good design for an embedded system, to maximize reliability.

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• My image does not load on a jQuery fade in effect even though the div loads.

  - by Konstantin

  jQuery(document).ready(function() { if (useMSIE){ pngfixALL(); }; jQuery(div).show(data_fadeInEffect, 500);return false; // jQuery(div).animate({opacity:1}, 500, 'linear'); }); This is what I have for a fade in effect. When using animate(), the image in the div tag fades in fine. However, when I use show(), the div loads because I can click in that area, but the image itself doesn't load. Why is this happening? I have another area of the code where I click on an 'x' in the image and it fades out using hide(). This works fine.

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• Javascript push Object to cookies using JSON

  - by Hunkeone

  Hi All on click button I need to add object to array and then write array to cookies. From the start this array can be not empty so I parse cookie first. function addToBasket(){ var basket = $.parseJSON($.cookie("basket")) if (basket.length==0||!basket){ var basket=[]; basket.push( { 'number' : this.getAttribute('number'), 'type' : this.getAttribute('product') } ); } else{ basket.push( { 'number' : this.getAttribute('number'), 'type' : this.getAttribute('product') } ); } $.cookie("basket", JSON.stringify(basket)); } And HTML <button type="button" class="btn btn-success btn-lg" number="12" product="accs" onclick="addToBasket()">Add</button> Unfortunately I'm getting Uncaught ReferenceError: addToBasket is not defined onclick. Can't understand what am I doing wrong? Thanks!

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• Zend Framework multiple databases

  - by Uffo

  I'm currently using only one database with Zend Framework, but now I have to add ONE MORE. I'm using this code right now: public static function setupDatabase() { $config = self::$registry->configuration; $db = Zend_Db::factory($config->db->adapter, $config->db->toArray()); $db->query("SET NAMES 'utf8'"); self::$registry->database = $db; Zend_Db_Table::setDefaultAdapter($db); } What code do I need to write in order to use ONE MORE database; and how I will reference it, when I need to make some queries or so.. Best Regards!

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• Doesnt the Visual Studio 2008 compiler autocast to double with sqrt in C++?

  - by Chris_45

  Shouldn't the compiler automatically cast to a double in this case at least according to Walter Savitch: #include <iostream> #include <cmath> using namespace std; int main(){ int k; for(k = 1; k <= 10; k++) cout << "The square root of i is: " << sqrt(k) << endl; return 0; }//error C2668: 'sqrt' : ambiguous call to overloaded function //Visual Studio 2008 on Win Vista

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• Learning 'dynamic' javascript bookmarklet

  - by Seatbelt99

  Little help for a javascript noob please... I have this in a .js file on my web server: Q=document.selection?document.selection.createRange().text:document.getSelection(); alert(Q); I highlight some text on a web page (tested with Chrome and firefox) and paste this into the address bar: javascript:(function(){vara=document.createElement('SCRIPT');a.type='text/javascript';a.src='http://automatethegame.com/js/test.js?';document.getElementsByTagName("head")[0].appendChild(vara)})(); it appears to do nothing. Any assistance or suggestions would be appreciated. thanks

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• When using DrawText, what does TextFormatFlags.Internal (a.k.a. DT_INTERNAL) do?

  - by Daniel Stutzbach

  When using TextRenderer.DrawText(), what does setting the TextFormatFlags.Internal flag actually do? Equivalently, what does setting the DT_INTERNAL flag to Win32's DrawTextEx() function do? More to the point, when should I set that flag and when should I not set it? The documentation says: "Uses the system font to calculate text metrics", but I'm not entirely sure what that means. I've done some limited testing and setting the flag seems to change how the font is rendered when using a small font size, but doesn't seem to make a difference when using a large font size.

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• Getting users latest tweet with Django

  - by Hanpan

  I want to create a function which grabs every users latest tweet from a specific group. So, if a user is in the 'authors' group, I want to grab their latest tweet and then finally cache the result for the day so we only do the crazy leg work once. def latest_tweets(self): g = Group.objects.get(name='author') users = [] for u in g.user_set.all(): acc = u.get_profile().twitter_account users.append('http://twitter.com/statuses/user_timeline/'+acc+'.rss') return users Is where I am at so far, but I'm at a complete loose end as to how I parse the RSS to get there latest tweet. Can anyone help me out here? If there is a better way to do this, any suggestions are welcome! I'm sure someone will suggest using django-twitter or other such libraries, but I'd like to do this manually if possible. Cheers

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• How can one describe a rock-paper-scissors relationship between 3 items?

  - by Madara Uchiha

  Let's say I have the following structure: abstract class Hand {} class Rock extends Hand {} class Paper extends Hand {} class Scissors extends Hand {} The goal is to make a function (or a method) Hand::compareHands(Hand $hand1, Hand $hand2), which would return the winning hand in a rock-paper-scissors match. That would be very easy with a bunch of ifs, but the point is to have a more robust structure, that's relying on polymorphism rather than on procedural code. P.S. this is done in actual production code, if someone is asking. This isn't some sort of challenge or homework. (It's not really rock-paper-scissors, but you get the point).

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• SSRS Issue: Rounding to nearest .25

  - by D.R.

  I have an SSRS (2008) report that takes in a raw transactions, then groups and totals them. At the "Total" level, I would like to round the final numbers to the nearest .25, however I cannot find a method to do this. According to what I've read, the Round() function in SSRS only rounds to integers. I have found a couple ways to do it in SQL, but the problem is, I want to do all the calculations with the REAL numbers and just round the result so that I don't introduce a significant amount of error from the real numbers. Here's the best SQL solution I could find: dec(round(number * 4, 0)/4,11,2) as Nearest_Qtr Anyone know how I could do the equivalent in the actual SSRS report? Thanks in advance for the help!

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• Why is forwarding variadic parameters invalid?

  - by awesomeyi

  Consider the variadic function parameter: func foo(bar:Int...) -> () { } Here foo can accept multiple arguments, eg foo(5,4). I am curious about the type of Int... and its supported operations. For example, why is this invalid? func foo2(bar2:Int...) -> () { foo(bar2); } Gives a error: Could not find an overload for '_conversion' that accepts the supplied arguments Why is forwarding variadic parameters invalid? What is the "conversion" the compiler is complaining about?

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• Returning new base class when the parent class shared pointer is the return type

  - by Ben Dol

  Can you have a parent class shared pointer return type of a function and then return a new child class without it being a shared pointer? I'm not sure how shared pointers work in these situations, do they act like a regular pointer? Here is my example: BaseEventPtr Actions::getEvent(const std::string& nodeName) { if(asLowerCaseString(nodeName) == "action") return new ActionEvent(&m_interface); return nullptr; } ActionEvent is the subclass of BaseEvent in this situation. Cheers!

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• disable javascript popup on refreshing page

  - by vatismarty

  Hi all, I have written code like this to throw a pop up when my website is closed. But this throws the pop up even if i refresh my page. Please help me to throw popup only when i close the browser of that website. (disable popup on refreshing page) <body onunload="javascript: exitpop()"> <script type="text/javascript"> function exitpop() { my_window= window.open ("","mywindow1","status=1,width=600,height=400"); my_window.document.write('<h1>My Team</h1><p>Thank you</p><p>If you accidentally closed website click <a href="http://www.google.com">here</a> to go back to our website</p>'); }.

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• change the user informatoin on each row click in the jquery grid

  - by kumar

  hello friends I am using jquery grid, I have a grid with user data, I need a code to handle to handle the click on each row? that is if I click First row I need to display first row user information in the bottom of the grid, if I click second row I need to dispaly second user iformation on the grid can any body help me out how to handle the click event using jquery/ Here is my code.. $("#table1").Click(function()///// how to handle the click event for each row and how to pass the ID value to change the user each time on click { $("#table2").show(); } thanks

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• How to replace&add the dataframe element by another dataframe in Python Pandas?

  - by bigbug

  Suppose I have two data frame 'df_a' & 'df_b' , both have the same index structure and columns, but some of the inside data elements are different: >>> df_a sales cogs STK_ID QT 000876 1 100 100 2 100 100 3 100 100 4 100 100 5 100 100 6 100 100 7 100 100 >>> df_b sales cogs STK_ID QT 000876 5 50 50 6 50 50 7 50 50 8 50 50 9 50 50 10 50 50 And now I want to replace the element of df_a by element of df_b which have the same (index, column) coordinate, and attach df_b's elements whose (index, column) coordinate beyond the scope of df_a . Just like add a patch 'df_b' to 'df_a' : >>> df_c = patch(df_a,df_b) sales cogs STK_ID QT 000876 1 100 100 2 100 100 3 100 100 4 100 100 5 50 50 6 50 50 7 50 50 8 50 50 9 50 50 10 50 50 How to write the 'patch(df_a,df_b)' function ?

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• is it possible to evaluate JavaScript code using XMLHttpRequest

  - by user1064717

  I'm trying to use this ajax request to call a file with some php which is working ok and some JavaScript which is not. any ideas? function showpart2(){ if(window.XMLHttpRequest){ xmlhttp = new XMLHttpRequest(); xmlhttp.open("GET","atuamae.org/parte2-encomendar.php",false); xmlhttp.send(null); } document.getElementById('part2').innerHTML = xmlhttp.responseText; eval(xmlhttp.responseText.getElementById('part2').innerHTML) setTimeout('showpart2()',15000); } showpart2(); </script>

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• finding download box element with capybara in cucumber test

  - by a5his

  Hi, I have a link that downloads a file. As I click the link it displays dialog box with "save" and "open" option and "Cancel" and "OK" button. I want to find "OK" and "Cancel" button for cucumber test. I took help from below link but didn't helped much. How to test a confirm dialog with Cucumber? **features code** And I want to click "OK" **steps code** Then /^I want to click "([^\"]*)"$/ do |option| retval = (option == "OK") ? "true" : "false" page.evaluate_script('window.confirm = function() { return true; }') page.click("OK") end

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• c# Dynamically generated controls issue.

  - by Thomas

  Good Day I have a form with a panel docked in it. I then dynamically create 15 panels (named: panel_n) and 15 pictureboxes (named: picturebox_n) on the primary panel (named ContainerPanel). When dragging the any picturebox over a panel (panel_n) created using the relevant mouse events. I would like to get the panel's name that the picture box was dragged over. The mouse cursor seems to be captured. I have tried creating a IMessageFilter interface, but there are still no events that trigger when dragging one of the pictureboxes over any one of the panels. The ClientRectangle.IntersectsWith function also does not work as the co-ords are always 0,0. All I need is the panel name where the picturebox was dragged over (preferably on the mouseup event)

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• Why should pop() take an argument?

  - by Stephano

  Quick background I'm a Java developer who's been playing around with C++ in my free/bored time. Preface In C++, you often see pop taking an argument by reference: void pop(Item& removed); I understand that it is nice to "fill in" the parameter with what you removed. That totally makes sense to me. This way, the person who asked to remove the top item can have a look at what was removed. However, if I were to do this in Java, I'd do something like this: Item pop() throws StackException; This way, after the pop we return either: NULL as a result, an Item, or an exception would be thrown. My C++ text book shows me the example above, but I see plenty of stack implimentations taking no arguments (stl stack for example). The Qustion How should one implement the pop function in C++? The Bonus Why?

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• C++ include .h includes .cpp with same name as well?

  - by aaron

  so I have text.cpp, which 'includes' header.h, and then I have a header.cpp which includes header.h. How is header.cpp compiled as well? I'm walking through a guide here, and thoroughly confused. Also, what is the correct terminology for what I am asking? I know I sound like a moron, and I apologize, but I'm ignorant. Oh, main is in test.cpp. Also, if header.cpp includes , why can't I use iostream function calls in text.cpp if it is included? If I include iostream in text.cpp will it be included in the program twice (in other words, bloat it)?

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• Prims vs Polys: what are the pros and cons of each?

  - by Richard Inglis

  I've noticed that most 3d gaming/rendering environments represent solids as a mesh of (usually triangular) 3d polygons. However some examples, such as Second Life, or PovRay use solids built from a set of 3d primitives (cube, sphere, cone, torus etc) on which various operations can be performed to create more complex shapes. So my question is: why choose one method over the other for representing 3d data? I can see there might be benefits for complex ray-tracing operations to be able to describe a surface as a single mathematical function (like PovRay does), but SL surely isn't attempting anything so ambitious with their rendering engine. Equally, I can imagine it might be more bandwidth-efficient to serve descriptions of generalised solids instead of arbitrary meshes, but is it really worth the downside that SL suffers from (ie modelling stuff is really hard, and usually the results are ugly) - was this just a bad decision made early in SL's development that they're now stuck with? Or is it an artefact of what's easiest to implement in OpenGL?

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• How to get title from a website by xpath?

  - by qxxx

  I am playing around with xpath, but have no Idea how to for example get a title from a website using xpath, here is my code but I don't know what to do next... $dom = new DOMDocument(); $dom->loadHTMLFile("http://www.cool.de"); $x=new DOMXPath($dom); $result = $x->query("//TITLE"); //...??? and print_r($result) shows me only "Object", is there a function like print_r to see what is inside an object so I don't have to guess?

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• How to paste text and variables into a logical expression in R?

  - by Jasper

  I want to paste variables in the logical expression that I am using to subset data, but the subset function does not see them as column names when pasted (either with ot without quotes). I have a dataframe with columns named col1, col2 etc. I want to subset for the rows in which colx < 0.05 This DOES work: subsetdata<-subset(dataframe, col1<0.05) subsetdata<-subset(dataframe, col2<0.05) This does NOT work: for (k in 1:2){ subsetdata<-subset(dataframe, paste("col",k,sep="")<0.05) } for (k in 1:2){ subsetdata<-subset(dataframe, noquote(paste("col",k,sep=""))<0.05) } I can't find the answer; any suggestions?

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• Accessing subclass members from a superclass pointer C++

  - by Dr. Monkey

  I have an array of custom class Student objects. CourseStudent and ResearchStudent both inherit from Student, and all the instances of Student are one or the other of these. I have a function to go through the array, determine the subtype of each Student, then call subtype-specific member functions on them. The problem is, because these functions are not overloaded, they are not found in Student, so the compiler kicks up a fuss. If I have a pointer to Student, is there a way to get a pointer to the subtype of that Student? Would I need to make some sort of fake cast here to get around the compile-time error?

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• How to implement "drag n drop" user interface on website?

  - by Nikkeloodeni

  Hello, I was wondering what would be the best way to implement some kind of "drag n drop" user interface? What i mean is that there would be one main page and every link click (eg. other sections like about, gallery, contact form) would open a new drag n drop element on top of that main page. Something like windows desktop where you can move your application windows around the screen. Would it be best to call different functions with AJAX when a link is clicked? Like "gallery" link would call gallery-function and retrieve dynamically generated contents of that "window" with AJAX call and then just load that stuff on some div? Or would some other type of approach suit better for this? I hope I was able to explain this clearly enough. I'm looking for a proper "design pattern" to implement this. All suggestions are wellcome! :)

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