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  • Hardest concept to grasp as a beginner

    - by noizetoys
    When you were starting to program, what was the hardest concept for you to grasp? Was it recursion, pointers, linked lists, assignments, memory management? I was wondering what gave you headaches and how you overcame this issue and learned to love the bomb, I mean understand it. EDIT: As a followup, what helped you grok your hard-to-grasp concept?

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  • C# - periodic data reading and Thread.Sleep()

    - by CaldonCZE
    Hello, my C# application reads data from special USB device. The data are read as so-called "messages", each of them having 24 bytes. The amount of messages that must be read per second may differ (maximal frequency is quite high, about 700 messages per second), but the application must read them all. The only way to read the messages is by calling function "ReadMessage", that returns one message read from the device. The function is from external DLL and I cannot modify it. My solution: I've got a seperate thread, that is running all the time during the program run and it's only job is to read the messages in cycle. The received messages are then processed in main application thread. The function executed in the "reading thread" is the following: private void ReadingThreadFunction() { int cycleCount; try { while (this.keepReceivingMessages) { cycleCount++; TRxMsg receivedMessage; ReadMessage(devHandle, out receivedMessage); //...do something with the message... } } catch { //... catch exception if reading failed... } } This solution works fine and all messages are correctly received. However, the application consumes too much resources, the CPU of my computer runs at more than 80%. Therefore I'd like to reduce it. Thanks to the "cycleCount" variable I know that the "cycling speed" of the thread is about 40 000 cycles per second. This is unnecessarily too much, since I need to receive maximum 700 messagges/sec. (and the device has buffer for about 100 messages, so the cycle speed can be even a little lower) I tried to reduce the cycle speed by suspending the thread for 1 ms by Thread.Sleep(1); command. Of course, this didn't work and the cycle speed became about 70 cycles/second which was not enough to read all messages. I know that this attempt was silly, that putting the thread to sleep and then waking him up takes much longer than 1 ms. However, I don't know what else to do: Is there some other way how to slow the thread execution down (to reduce CPU consumption) other than Thread.Sleep? Or am I completely wrong and should I use something different for this task instead of Thread, maybe Threading.Timer or ThreadPool? Thanks a lot in advance for all suggestions. This is my first question here and I'm a beginner at using threads, so please excuse me if it's not clear enough.

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  • Semantic #region usage

    - by Luca
    What's your opinion about using #region folding using application semantic, instead of folding for "syntax". For example: #region Application Loop #region User Management #region This Kinf of stuffs instead of #region Private Routines #region Public Properties #region ThisRoutine // (Yes, I've seen this also!) In this logic, I'm starting fold even routine bodies. I'm starting to love #region directive (even using #pragma region when using C++!).

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  • Efficiently fetching and storing tweets from a few hundred twitter profiles?

    - by MSpreij
    The site I'm working on needs to fetch the tweets from 150-300 people, store them locally, and then list them on the front page. The profiles sit in groups. The pages will be showing the last 20 tweets (or 21-40, etc) by date, group of profiles, single profile, search, or "subject" (which is sort of a different group.. I think..) a live, context-aware tag cloud (based on the last 300 tweets of the current search, group of profiles, or single profile shown) various statistics (group stuffs, most active, etc) which depend on the type of page shown. We're expecting a fair bit of traffic. The last, similar site peaked at nearly 40K visits per day, and ran intro trouble before I started caching pages as static files, and disabling some features (some, accidently..). This was caused mostly by the fact that a page load would also fetch the last x tweets from the 3-6 profiles which had not been updated the longest.. With this new site I can fortunately use cron to fetch tweets, so that helps. I'll also be denormalizing the db a little so it needs less joins, optimize it for faster selects instead of size. Now, main question: how do I figure out which profiles to check for new tweets in an efficient manner? Some people will be tweeting more often than others, some will tweet in bursts (this happens a lot). I want to keep the front page of the site as "current" as possible. If it comes to, say, 300 profiles, and I check 5 every minute, some tweets will only appear an hour after the fact. I can check more often (up to 20K) but want to optimize this as much as possible, both to not hit the rate limit and to not run out of resources on the local server (it hit mysql's connection limit with that other site). Question 2: since cron only "runs" once a minute, I figure I have to check multiple profiles each minute - as stated, at least 5, possibly more. To try and spread it out over that minute I could have it sleep a few seconds between batches or even single profiles. But then if it takes longer than 60 seconds altogether, the script will run into itself. Is this a problem? If so, how can I avoid that? Question 3: any other tips? Readmes? URLs?

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  • Windows7 run as admin with password

    - by dakull
    I love running as a standard user for its security pluses, my admin account is password protected. The problem appears when I need to run a program that requires admin rights, is there a way to include the password somehow so I won't have to type it every time ? Without changing my current setup: admin password protected account and I log on to a limited standard user account. I'm thinking of script or something like that ?

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  • Is it possible to run OSX in a virtual machine?

    - by Frep D-Oronge
    I'd love to be able to try Mac OSX in a VM, preferable on something shiny and new like KVM for linux. I'm a Linux and Windows person, but would like to try out OSX without investing in the expensive hardware or accumulating yet another box to fit somewhere under my desk. (Read: no I don't want to get a Mac Mini) Is this possible? Legal? If so, what are the drawbacks and tricks

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  • Overview of mobile browsers and their features?

    - by Janusz
    I'm looking for a comparison of the features of mobile browsers. Most interesting are the default preinstalled browsers. I would love a matrix that shows what device line can do what with their preinstalled browser. There is a list with rendering engines on wikipedia but there should be differences appart from the rendering right?

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  • C++ - Is it possible to implement memory leak testing in a unit test?

    - by sevaxx
    I'm trying to implement unit testing for my code and I'm having a hard time doing it. Ideally I would like to test some classes not only for good functionality but also for proper memory allocation/deallocation. I wonder if this check can be done using a unit testing framework. I am using Visual Assert btw. I would love to see some sample code , if possible !

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  • How can I test email generating without creating and checking 1,000 addresses?

    - by twpc
    I am working on generating emails using Java. I would love to use some sort of system where I can send out mass emails and ensure that the emails were received by the intended recipient (A. My code to send the emails worked and B.The emails were not marked as spam). How can I do this without setting up (and keeping track of) a couple hundred email addresses and then checking each one individually? Thanks!

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  • Your favorite time-off between programming.

    - by Harsha
    I am sure all coding pundits here will have one (or multiple) ways of spending some time-off between hectic coding sessions just to relax. Would love to hear from you all as I am a newbie and want to take little breaks (non-physical) from coding and do things which actually help me focus again. Thanks.

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  • Reason why UIImage gives me a 'distorted' image sometimes

    - by Cedric Vandendriessche
    I have a custom UIView with a UILabel and a UIImageView subview. (tried using UIImageView subclass aswell). I assign an image to it and add the view to the screen. I wrote a function which adds the amount of LetterBoxes to the screen (my custom class): - (void)drawBoxesForWord:(NSString *)word { if(boxesContainer == nil) { /* Create a container for the LetterBoxes (animation purposes) */ boxesContainer = [[UIView alloc] initWithFrame:CGRectMake(0, 205, 320, 50)]; [self.view addSubview:boxesContainer]; } /* Calculate width of letterboxes */ NSInteger numberOfCharacters = [word length]; CGFloat totalWidth = numberOfCharacters * 28 + (numberOfCharacters - 1) * 3; CGFloat leftCap = (320 - totalWidth) / 2; [letters removeAllObjects]; /* Draw the boxes to the screen */ for (int i = 0; i < numberOfCharacters; i++) { LetterBox *letter = [[LetterBox alloc] initWithFrame:CGRectMake(leftCap + i * 31 , 0, 28, 40)]; [letters addObject:letter]; [boxesContainer addSubview:letter]; [letter release]; }} This gives me the image below: http://www.imgdumper.nl/uploads2/4ba3b2c72bb99/4ba3b2c72abfd-Goed.png But sometimes it gives me this: imgdumper.nl/uploads2/4ba3b2d888226/4ba3b2d88728a-Fout.png I add them to the same boxesContainer but they first remove themselves from the superview, so it's not like you see them double or something. What I find weird is that they are all good or all bad.. This is the init function for my LetterBox: if (self == [super initWithFrame:aRect]) { /* Create the box image with same frame */ boxImage = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height)]; boxImage.contentMode = UIViewContentModeScaleAspectFit; boxImage.image = [UIImage imageNamed:@"SpaceOpen.png"]; [self addSubview:boxImage]; /* Create the label with same frame */ letterLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height)]; letterLabel.backgroundColor = [UIColor clearColor]; letterLabel.font = [UIFont fontWithName:@"ArialRoundedMTBold" size:26]; letterLabel.textColor = [UIColor blackColor]; letterLabel.textAlignment = UITextAlignmentCenter; [self addSubview:letterLabel]; } return self;} Does anyone have an idea why this could be? I'd rather have them display correctly every time :)

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  • VIM Flashing Issue

    - by user1302110
    I'm SSH'ing in from my mac OSX (10.6.8) to a school server running centOS5 and when I attempt to use VIM, it won't stop flashing inside the mac terminal. Any idea's on how to fix this? Keep in my mind I do not have the authority to modify any /etc files or /bin files on the server, although I believe I can locally on my user. Also I would love to see anyone's really cool .vimrc config file they want to share.

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  • The Stackoverflow alert box, How is it done?

    - by Scott
    Question says it all. Can someone point me to an example of how they do the alerts at the top when a new message arrives or someone posts to my answers or I just have a notification.. Thanks. P.s. I would love a JQUERY solution, but can work with just a js solution.

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  • Why use Hibernate/nHibernate?

    - by ProgrammingPope
    I have found myself doing a lot of work to get nHibernate setup and am left wondering: Why use a framework like Hibernate/NHibernate? I am sure that quite a few people love the framework but I am unclear on the advantages and disadvantages. What are the advantages and disadvantages of lazy loading, and are there other features to Hibernate? Is there anything that makes a framework like this easier to use (best practices, other frameworks, etc)?

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  • Entity framework: Need a easy going, clean database migration solution.

    - by user469652
    I'm using entity framework model first development, and I need to do database migration often, The EF database generation power pack doesn't help a lot, because that data migration never worked here. The database migration here I mean, change the model, and then I can update the existing database from the model, but creating a new one. Is there any free of charge tool here invented here yet? Or would this going to be a new feature of next EF release? PS: I love django's ORM.

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  • fieldWithErrors not wrapping every error field

    - by Teef L
    Notice the following result when I submit blank :title and :description fields The validations are in the controller: class Question < ActiveRecord::Base validates_presence_of :title validates_presence_of :description And, the form is generated with those names: -form_for(@question) do |f| = f.error_messages = f.label :title = f.text_field :title, :size => 50, :onchange => remote_function(:url => {:action => :display_tag_suggestions}, :with => 'Form.Element.serialize(this)') #suggestions = f.label :description = f.text_area :description ... But, for some reason, only :title gets wrapped in the error div tags: <form action="/questions" class="new_question" id="new_question" method="post"> <div style="margin:0;padding:0"><input name="authenticity_token" type="hidden" value="6HQaiu1D0gBQcKw2pLeZP6Jvn0FSClPD5Sk9HwegzPg=" /></div> <div class="errorExplanation" id="errorExplanation"> <h2>2 errors prohibited this question from being saved</h2> <p>There were problems with the following fields:</p> <ul> <li>Title can't be blank</li> <li>Description can't be blank</li> </ul> </div> <label for="question_title">Title</label> <div class="fieldWithErrors"><input id="question_title" name="question[title]" onchange="new Ajax.Request('/questions/display_tag_suggestions', {asynchronous:true, evalScripts:true, parameters:Form.Element.serialize(this) + '&amp;authenticity_token=' + encodeURIComponent('6HQaiu1D0gBQcKw2pLeZP6Jvn0FSClPD5Sk9HwegzPg=')})" size="50" type="text" value="" /></div> <label for="question_description">Description</label> <textarea cols="40" id="question_description" name="question[description]" rows="20"></textarea> ... I don't think that behavior is expected. The problem most people have is that it's wrapping things with divs, which won't display properly. My problem is that fields aren't being wrapped with divs to begin with! I haven't made any (conscious) changes to how errors are handled, so I'm not sure why it's not working properly.

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  • How would you show a file with cURL?

    - by Kyle
    There is an epic lack of PHP cURL love on the Internet for beginners like me. I was wondering how to use cURL to download & display an ICS file (They're plain text to me...) in my PHP code. Unless fopen() is 1,000 times easier, I'd like to stick with cURL for this one.

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  • Shakin' things up

    - by j-t-s
    Hi All I have a little app here, and I would love to be able to do my own stuff in Vista/Win7 when I shake the form. Currently, when a form is shaken, it will restore/minimize everything else. But I want to change that behavior in my app only. So when my form is shaken, I could, for example, shuffle the playlist, or Clear the contents of a Canvas etc... Is this possible? Thank you

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  • Joomla Mailto Component unable to send mails occassionally

    - by kyle
    Greetings, I will certainly hope someone will be able to provide some enlightenment to my problem. Currently, I have 2 joomla sites, layout and menus are a replicate of the other. I noticed that on both Joomla, I will occasionally encounter "Unable to send mail" after a form submission. Is this the fault of my server, or the fault of Joomla's PHP Mailer ? I will certainly love to approach my hosting company for a solution but I do not want to place a false accusation on them.

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  • ModalPopupExtender with thmbnail (problem in javascript)

    - by arny
    this is the code,it is not working in Firefox,Chrome,to show full size image unless user click on image for couple of times, I basically replace the thmbnail image with full size image in javascript, here is my code, TransitionDuration="50" FramesPerSecond="40" RequireOpenedPane="false" SelectedIndex="-1" SuppressHeaderPostbacks="true" HeaderCssClass="accordionHeader" ContentCssClass="accordionContent" OnItemDataBound="Accordion1_ItemDataBound" OnItemCommand="Accordion1_ItemCommand" ' ' Width="90px" Height="70px" onclick="togglePopupImage2(this);" CssClass="thumbnail" BorderColor="Navy" BorderStyle="Solid" BorderWidth="1" <table> <tr> <td style="background-color: #2E4d7B; height: 15px; color: White; font: arial bold 12px; padding: 5px"> <label id="imgText" runat="server"> </label> </td> </tr> <tr> <td> <asp:Image ID="imgPopup" CssClass="imgpopup" runat="server" /> </td> </tr> <tr> <td align="center" style="background-color: #2E4d7B; height: 25px;"> <asp:Button ID="btnCancel" runat="server" Text="Close" CssClass="closeimage"/> </td> </tr> </table> </asp:Panel> And javascript code: function togglePopupImage2(thumbnail2) { var imageurl = thumbnail2.src; var temp = new Array(); temp = imageurl.split('.'); var imagepopup = temp[0].substring(0, temp[0].length - 3) + "." + temp[1]; var img = new Image(); img.src = imagepopup; $get('ctl00_MainContentCPH_UserInterfaceID').style.visibility = 'visible'; $get('ctl00_MainContentCPH_imgPopup').src = img.src; //alert(img.src); if (img.width > 750) { if (screen.width == '1024' || screen.width == '800') { $get('ctl00_MainContentCPH_imgPopup').width = 550; //to show the picture in 1024 or 800 resolutions } else { $get('ctl00_MainContentCPH_imgPopup').width = 750; } } else { $get('ctl00_MainContentCPH_imgPopup').width = img.width; } if (img.height > 568) { if (screen.width == '1024' || screen.width == '800') { $get('ctl00_MainContentCPH_imgPopup').height = 350; //to show the picture in 1024 or 800 resolutions } else { $get('ctl00_MainContentCPH_imgPopup').height = 568; } } else { $get('ctl00_MainContentCPH_imgPopup').height = img.height; } // } } Please find the error and let me know what is the right way to achieve this? Thanks in advance

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  • how do you install a PEAR package on WAMP, Windows 7?

    - by Haroldo
    I've no idea with command line stuff! What i've done: changed my php.ini to phar.require_hash - off ran go-pear.bat so i'm pretty sure i've got PEAR installed, now I'd like to install this package I've tried following the instructions but I really don't know how to do things with cmd.exe, would love some help!

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