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  • Distinguishing between failure and end of file in read loop

    - by celtschk
    The idiomatic loop to read from an istream is while (thestream >> value) { // do something with value } Now this loop has one problem: It will not distinguish if the loop terminated due to end of file, or due to an error. For example, take the following test program: #include <iostream> #include <sstream> void readbools(std::istream& is) { bool b; while (is >> b) { std::cout << (b ? "T" : "F"); } std::cout << " - " << is.good() << is.eof() << is.fail() << is.bad() << "\n"; } void testread(std::string s) { std::istringstream is(s); is >> std::boolalpha; readbools(is); } int main() { testread("true false"); testread("true false tr"); } The first call to testread contains two valid bools, and therefore is not an error. The second call ends with a third, incomplete bool, and therefore is an error. Nevertheless, the behaviour of both is the same. In the first case, reading the boolean value fails because there is none, while in the second case it fails because it is incomplete, and in both cases EOF is hit. Indeed, the program above outputs twice the same line: TF - 0110 TF - 0110 To solve this problem, I thought of the following solution: while (thestream >> std::ws && !thestream.eof() && thestream >> value) { // do something with value } The idea is to detect regular EOF before actually trying to extract the value. Because there might be whitespace at the end of the file (which would not be an error, but cause read of the last item to not hit EOF), I first discard any whitespace (which cannot fail) and then test for EOF. Only if I'm not at the end of file, I try to read the value. For my example program, it indeed seems to work, and I get TF - 0100 TF - 0110 So in the first case (correct input), fail() returns false. Now my question: Is this solution guaranteed to work, or was I just (un-)lucky that it happened to give the desired result? Also: Is there a simpler (or, if my solution is wrong, a correct) way to get the desired result?

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  • Connect to wifi ubuntu 14.04 (new ubuntu user)

    - by user289168
    I have recently changed my operating system from windows 8 to ubuntu 14.04, when trying to connect to the network via wifi the system just keeps asking for my password over and over without connecting. The connectivity through an Ethernet cable is perfectly fine however and my wifi worked fine through windows 8, I have very little ubuntu knowledge so i apologise if the right information is not shown in this question. Just wondering if there was any known problems or if anyone has seen this before? Thanks in advance for any help, Tom

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  • SQL Southwest, Thursday 18th Oct - User Group Meetup and Virtual Meetup

    October's meeting on Thursday 18th will be a virtual meeting which means anyone in the world can attend if they have access to a PC with an internet connection. We are pleased to announce that Grant Fritchey will be giving us 2 sessions. "It really helped us isolate where we were experiencing a bottleneck"- John Q Martin, SQL Server DBA. Get started with SQL Monitor today to solve tricky performance problems - download a free trial

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  • Is it possible to generate end comments for html

    - by Gandalf StormCrow
    Is it possible to generate comments for closing div tags, lets take this ex. into consideration normal HTML: <div id="content"> ... ...buch of html or whateve </div> with comments : <div id="content"> ... ...buch of html or whateve </div><!--End of content--> and so on go trough each div element and comment the end of it ?

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  • PHP user created function return values problem

    - by faX
    Okay I'm new here and I have been trying to figure this out all day I have two functions one calling the other but my functions only returns the last value for example 29 when it should return multiple values. As wondering how can I fix this problem so that my functions return all the values. Here is my PHP code. function parent_comments(){ if(articles_parent_comments_info($_GET['article_id']) !== false){ foreach(articles_parent_comments_info($_GET['article_id']) as $comment_info){ $comment_id = filternum($comment_info['comment_id']); reply_comment_count($comment_id); } } } function reply_comment_count($parent_id){ if(articles_reply_comments_info($_GET['article_id']) !== false){ foreach(articles_reply_comments_info($_GET['article_id']) as $reply_info){ $comment_id = filternum($reply_info['comment_id']); $reply_id = filternum($reply_info['parent_id']); if($parent_id === $reply_id){ reply_comment_count($comment_id); } } } return $comment_id; }

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  • SEO is Not As Important As User Experience

    I'm often surprised at how many webmasters so obviously create their sites for the search engines and not visitors. The proof of that is how frequently a keyword is sometimes used within the text. We all know that it is important to get noticed by the search engines with a view to getting a site indexed highly. And one way to do that is to ensure your keywords stand out. But, simply repeating them to the point of boredom isn't the right way to do that.

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  • SFTP/SSH profile load

    - by Alex
    I have a CentOS 6.2 server. Whenever some one logs into the server using the terminal (SSH) the user profile (.bash_profile) is loaded. Now my question is, is there a profile that loads whenever you use SFTP to login into the server via "FTP browsing software" ( I use WinSCP ), I want to send an email whenever a user logs into the server via SFTP. I already have the code to do this when a user logs into the terminal (SSH) when his profile loads. Thanks

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  • Skype audio always goes 'robotic' for the same user

    - by John
    Someone I talk to on Skype a lot has a very persistent issue, where after a few minutes their voice goes very 'robotic'... still understandable but annoying. We can restart the call and it's fine, but fairly consistently after a few minutes it returns. He experiences this with other people too, not just me - I don't have anyone report problems with my audio quality. This is not an ISP issue - he gets the same problem on multiple PCs in different countries, in fact he's even recently moved to a different continent and got a new internet connection... same problem. It seems somehow to be a problem with his Skype account, which is really quite odd. It's been going on for months of not longer.

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  • Replacing the end of the line by SED in makefile

    - by Masi
    How can you append to the end of a line by SED controlled by makefile? I run paste -d" " t.tex tE.tex | sed 's@$@XXX@' > tM.tex where the problem is in the use of the mark $ for the end of the line. I get #paste -d" " t.tex tE.tex | sed -e s/" "/\\\&/g | sed -r "s/XXX/" > tM.tex sed: -e expression #1, char 10: unterminated `s' command make: *** [all] Error 1 I have the command just after the "all:" tag in my makefile which contains only the two lines. The parameters -n and -e do not help here. The command works as expected run when it is run directly in terminal.

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  • SQL - Break a start/end time into 15 minute records

    - by Chu
    I've got a record set that consists of a start and end time in two separate fields: id - Int startTime - DateTime endTime - DateTime I'd like to find a way to query a record and return it as X records based on the number of 15 minute intervals found between the start and end times. For example, let's say I have a record like this: id, StartTime, EndTime 1, 1/1/2010 8:28 AM, 1/1/2010 8:47 AM I would return 3 records, the first would represent the 8:15 interval, #2 for the 8:30 interval and then a 3rd for the 8:45 interval. I realize this could be done using logic in an sproc, but we are trying to remain db neutral as we support multiple database engines.

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  • Display username to logged in user only?

    - by RodeoRamsey
    I have a Wordpress blog set up to display comments as "Anonymous User" by hard coding it into the comments.php file. I would like to have it say the user's Username next to their comment and ONLY display that Username to THEM. In other words, if they're a guest, they'll see "Anonymous User" and if they're a registered/logged in DIFFERENT user, they'll still see "Anonymous User", but if it's THEIR comment it'll say "Your Comment" or their own username. Any clue on a snippet of code? Here's what I have so far: Anonymous User: <div class="post-txt" id="<?php comment_ID() ?>"><?php comment_text() ?></div> Thanks!

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  • How to Catch Attention of the User - Part 1

    Search engine marketing has made simple the marketing process of various businesses. It helps enhance the visibility of the websites in search engine result pages through various processes including search engine optimization, paid inclusions, paid advertisement placements, etc.

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  • Picking a front-end UI framework

    - by user457724
    Hi folks, We're working to build the front-end of our application and struggling with selecting a good UI framework since we're not experienced UI people (we're mainly back-end developers). The central issue is that we don't know what we don't know and don't know how to best weigh our different options. At the moment, we're evaluating Flex, ExtJS, and Vaadin. Is there another option we should consider? What, are the major elements we should evalutate on? Any insight would be helpful. Thanks, Alex

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  • The entire User Interface freezes/becomes unresponsive for up to 20 seconds

    - by user2400801
    I am a rails developer, using Ubuntu 13.10 installed on a Asus S550C Ultrabook (was a windows 8 machine originally) Every day I work with Sublime Text 2, Google Chrome, and Terminal (about 6 tabs open) The problem: clicking on the menu bar (eg File - Save) while using Sublime Text 2 will occasionally (eg almost always) make the ENTIRE COMPUTER freeze for up to 20 seconds. This occasionally happens when I go to log out / lock my computer. Sometimes it doesn't freeze completely but rather is just very sluggish and then recovers. I don't know if this is a problem with Sublime Text 2, or the Ubuntu 13.10 operating system. (Thanks for reading) Best Regards

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  • Rails modeling for a user

    - by Trevor Hartman
    When building a rails app that allows a User to login and create data, is it best to setup a belongs_to :user association on every single model? For example, let's say a user can create Favorites, Colors and Tags. And let's say Favorites has_many :tags and Colors also has_many :tags. Is it still important for Tags to belong_to :user assuming the User is the only person who has authority to edit those tags? And a similar question along the same lines: When updating data in FavoritesController, I've come to the conclusion that you perform CRUD operations by always doing something like User.favorites.find(params[:id].update_attributes(param[:favorite]) so that they can definitely only update models that belong to them. Right?

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