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• Jquery infinite scroll - with div not scrollbar of body

  - by Thomas

  suppose i have div and i want to fetch data and push data into that div. when user will drag scroll bar of div then next set of data will be fetch and pushed into div. how to detect when scroll bar of div drag to end by jquery. i don't want to use any plugin rather i need jquery code. here is the sample link i like it http://www.stevefenton.co.uk/cmsfiles/assets/File/infinitescroller.html but it used plugin. please help me with sample code for detecting scroll bar drag to end of div. thanks

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• openmp vs opencl for computer vision

  - by user1235711

  I am creating a computer vision application that detect objects via a web camera. I am currently focusing on the performance of the application My problem is in a part of the application that generates the XML cascade file using Haartraining file. This is very slow and takes about 6days . To get around this problem I decided to use multiprocessing, to minimize the total time to generate Haartraining XML file. I found two solutions: opencl and (openMp and openMPI ) . Now I'm confused about which one to use. I read that opencl is to use multiple cpu and GPU but on the same machine. Is that so? On the other hand OpenMP is for multi-processing and using openmpi we can use multiple CPUs over the network. But OpenMP has no GPU support. Can you please suggest the pros and cons of using either of the libraries.

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• Produce a script to hit Google once a day and log our position in the results?

  - by hawbsl

  The need has arisen within our organisation to monitor (on a daily basis) where our site appears (both organic and PPC) on the page 1 of Google. Also where a key competitor appears. For certain key words. In the immediate short term a colleague is doing this by hitting Google manually and jotting down the results. Yep. It occurs to us we can write a script (e.g. using C#) to do this. I know Analytics will tell us an awful lot but it doesn't note the competitor's position, plus I don't think it has other data we want. Question is, is there an existing basic tool which does this (for free, I guess)? And if we write it ourselves, where to start and are there obvious pitfalls to avoid (for example can Google detect and block automated requests?)

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• Clojure multimethod dispatching on functions and values

  - by Josh Glover

  I have a function that returns the indexes in seq s at which value v exists: (defn indexes-of [v s] (map first (filter #(= v (last %)) (zipmap (range) s)))) What I'd like to do is extend this to apply any arbitrary function for the existence test. My idea is to use a multimethod, but I'm not sure exactly how to detect a function. I want to do this: (defmulti indexes-of ???) (defmethod indexes-of ??? [v s] ;; v is a function (map first (filter v (zipmap (range) s)))) (defmethod indexes-of ??? [v s] ;; v is not a function (indexes-of #(= v %) s)) Is a multimethod the way to go here? If so, how can I accomplish what I'm trying to do?

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• detecting returned errors with $.post

  - by sova

  I'm using $.post to send a query to a JSP which returns some awesome data for me. If the query is malformed, however, the page returns with "error on page" and an HTTP Status of 500 Internal Server Error in jQuery, how can I detect this error so I can tell the user of the failure? runQuery : function () { $.post( admin_stats.runQueryURL, { buster : Math.random, statsQuery: admin_stats.getQuery(), jsp: 'admin_statsQuery' }, admin_stats.handleStatsQuery, "html" ); the returned data is an HTML table which is sufficient for this project at the moment. Also: totally open to criticism if this is ugly or not the way I should be doing things =)

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• Blob ID matching over multiple frames in C++ (image analysis)

  - by pollux

  Dear reader, I'm working on a blob matching and tracking library in C++. Currently I'm using openCV to detect blobs and try to match blobs in a new frame by checking the position, velocity and size of the blob. This works quite okay and I'm receiving a high blob match rate (95% or higher). Sometimes blobs fall out of the image or new blobs appear. Now I need to give matched blobs the same ID as they had before. I'm wondering if there are typical or commonly used techniques for doing this. Or even some keywords I can use to google on. Thanks

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• Validate decimal number in (known) national format

  - by Álvaro G. Vicario

  PHP has many built-in functions to validate numbers but they all expect input in computer format: 1234.56. I need to validate stuff like 1,234.56 (English) or 1.234,56 (Spanish), together with some typical attributes (accepted range, max number of decimals, etc.). I started writing my own function but I soon got lost. It's easy to read the user input into a float variable but I want to be able to detect numbers with invalid formats like 1,23456.7 or 1..25. Do you have any recommendation on the subject? (Decimal and thousand characters are known beforehand and it's okay to hard-code digit groups as three, there's no need to cover Indian number format.)

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• Closing several android activities simultaneously

  - by teedyay

  In my application you can navigate through several Activities until the Activity stack is quite deep. We'd like a button on every Activity that will take you straight back to the main menu - i.e. pop all Activities from the stack except the first one. I've put the button in a View that I can easily put on every Activity in the application, but I can't figure out how to close several Activities in one fell swoop. (If possible, it would be good if the View could work out how many Activities to close by itself - i.e. detect how deep on the stack its own Activity is.)

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• addthis sharing buttons adblocker workaround

  - by Manuel

  I just integrated the addthis sharing buttons into my website. I'd like to use the addthis buttons in reason of their tracking and reporting functionality. However they are blocked by adblock plus and other adblockers. Considering that nowaday 30% of internet users use an adblocker I thought of making a work around for those. I integrated manual sharing buttons into my website. So far so good. Do you have any idea on how to hide my manual sharing buttons if the addthis buttons are shown. Or better said, don't hide them if the addthis buttons are removed by a addblocker? Is it possible to detect an adblocker through js? thx, I really appreciate your help!

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• Finding Windows printer driver name using API

  - by Scott Bussinger

  I can't seem to find an API call that returns the driver name for a Windows printer. Note that I'm not talking about the friendly name of the printer in the printer folder, I'm talking about the name of actual driver being used as shown on the "Advanced" tab when you look at the printer properties: I'm trying to detect when I'm printing to the "Generic / Text Only" driver regardless of what name the user chooses for the printer. It doesn't seem like this should be hard, but I can't find it in the DEVMODE structure or anyplace else I've thought to look for it. Thanks for the help!

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• implementing keepalives with Java

  - by Bilal

  Hi All, I am biulding a client-server application where I have to implement a keepalive mechanism in order to detect that the client has crashed or not. I have separate threads on both client and server side. the client thread sends a "ping" then sleeps for 3 seconds, while the server reads the BufferedInput Stream and checks whether ping is received, if so it makes the ping counter eqauls zero, else it increments the counter by +1, the server thread then sleeps for 3 seconds, if the ping counter reaches 3, it daclares the client as dead. The problem is that when the server reads the input stream, its a blocking call, and it blocks untill the next ping is received, irrespective of how delayed it is, so the server never detects a missed ping. any suggestions, so that I can read the current value of the stream and it doesn't block if there is nothing on the incoming stream. Thanks,

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• HTML Input on change of value

  - by arik-so

  Hello, I have an input tag. This tag does not have the autocomplete feature turned off, thus, one does not necessarily need to release a key to change the value of this field and focus anotehr one. My question is: how can I detect ANY value changes of this particular field, like e. g. <input onvaluechange="//do following..." /> The JavaScritp attribute onchange does not fire on change of value, only on changes like blur, focus, etc... Thanks in advance!

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• Approximate photo of a simple drawing using lines

  - by user3704596

  As an input I have a photo of a simple symbol, e.g.: https://www.dropbox.com/s/nrmsvfd0le0bkke/symbol.jpg I would like to detect the straight lines in it, like points of start and ends of the lines. In this case, assuming the top left of the symbol is (0,0), the lines would be defined like this: start end (coordinates of beginning and end of a line) 1. (0,0); (0,10) (vertical line) 2. (0,10); (15, 15) 3. (15,15); (0, 20) 4. (0,20); (0,30) How can I do it (pereferably using OpenCV)? I though about Hough lines, but they seem to be good for perfect thin straight lines, which is not the case in a drawing. I'll probably work on binarized image, too.

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• I want absolute atomicity on a single couchdb instance (insert, fail if already existing)

  - by MatternPatching

  I've come to really love the couchdb style of organizing and updating data, but there are a few situations where I really need to be able to create an entry and determine if an equivalent entry is already in existence before returning to the user. The only situation that this is absolutely necessary for my application is user registration. I'm fine with having all user registration writes go to a particular, designated couchdb instance known as the "registration-instance". I want to hash the user_id into some _id to use. Then execute a put with this _id, but fail if the _id is already inserted. I need to return to the user that the user name is already reserved, and I cannot detect the conflict later and resolve it at that point, because the user would be under the impression that they had reserved the user name. I don't see why couchdb couldn't provide some way to do this, under the assumption that you designate that inserts for a particular "type" of document always are routed to a particular instance.

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• Java - JPA - @Version annotation

  - by Yatendra Goel

  I am new to JPA. I am cofused about the @Version annotation. How it works? I have googled it and found various answers whose extract is as follows: JPA uses a version field in your entities to detect concurrent modifications to the same datastore record. When the JPA runtime detects an attempt to concurrently modify the same record, it throws an exception to the transaction attempting to commit last. But still I am not sure how it works? ================================================================================== Also as from the following lines: You should consider version fields immutable. Changing the field value has undefined results. Does it mean that we should declare our version field as final

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• How to know from a bash script if the user abruptly closes ssh session

  - by Figo

  I have a bash script that acts as the default shell for a user loging in trough ssh. It provides a menu with several options one of wich is sending a file using netcat. The netcat of the embedded linux I'm using lacks the -w option, so if the user closes the ssh connection without ever sending the file, the netcat command waits forever. I need to know if the user abruptly closes the connection so the script can kill the netcat command and exit gracefully. Things I've tried so far: Trapping the SIGHUP: it is not issued. The only signal issued i could find is SIGCONT, but I don't think it's reliable and portable. Playing with the -t option of the read command to detect a closed stdin: this would work if not for a silly bug in the embedded read command (only times out on the first invocation)

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• How to handle "100 continue" HTTP message ?

  - by Stephane

  Hello, I'm writing a simplistic HTTP server that will accept PUT requests mostly from cURL as client and I'm having a bit of an issue with handling the "Expect: 100-continue" header. As I understand it, the server is supposed to read the header, send back a "HTTP/1.1 100 Continue" response on the connection, read the stream up to the value on "Content-Length" and then send back the real response code (Usually "HTTP/1.1 200 OK" but any other valid HTTP answer should do). Well, that's exactly what my server does. The problem is that, apparently, if I send a "100 Continue" answer, cURL fails to report any subsequent HTTP error code and assumes the upload was a success. For instance, if the upload is rejected due to the nature of the content (there is a basic data check happening), I want the calling client to detect the problem and act accordingly. Am I missing something obvious ? Thanks

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• Why does OSX document atoi/atof as not being threadsafe?

  - by Larry Gritz

  I understand that strtol and strtof are preferred to atoi/atof, since the former detect errors, and also strtol is much more flexible than atoi when it comes to non-base-10. But I'm still curious about something: 'man atoi' (or atof) on OS X (though not on Linux!) mentions that atoi/atof are not threadsafe. I frankly have a hard time imagining a possible implementation of atoi or atof that would not be threadsafe. Does anybody know why the man page says this? Are these functions actually unsafe on OS X or any other platform? And if they are, why on earth wouldn't the library just define atoi in terms of strtol, and therefore be safe?

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• Actionscript 3.0 platformer game

  - by Jez

  I have an flash game with the following code (http://pastie.org/9248528) When I run it, the player just falls and doesn't stop when he hits a platform. I tried debugging it and I had an error with moveCharacter's timer, but I don't know if that is the main problem. I put the player inside the wall and debugged it using breakpoints and it didn't detect that the player was inside the wall, skipping moving it to outside of the wall. If anyone has any ideas on what is wrong with my code then that would be great thanks!

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• Difference between redirecting to a page and coming to the same page after pressing back button

  - by Mac

  Actually i have a page in which i am not using cache by using this code HttpContext.Current.Response.Cache.SetExpires(DateTime.UtcNow.AddDays(-1)); HttpContext.Current.Response.Cache.SetValidUntilExpires(false); HttpContext.Current.Response.Cache.SetRevalidation(HttpCacheRevalidation.AllCaches); HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache); HttpContext.Current.Response.Cache.SetNoStore(); now i want to know is there any difference between coming to this page using a proper link or coming back using browser back button or is there any way to detect this.

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• Generate MySQL data dump in SQL from PHP

  - by Álvaro G. Vicario

  I'm writing a PHP script to generate SQL dumps from my database for version control purposes. It already dumps the data structure by means of running the appropriate SHOW CREATE .... query. Now I want to dump data itself but I'm unsure about the best method. My requirements are: I need a record per row Rows must be sorted by primary key SQL must be valid and exact no matter the data type (integers, strings, binary data...) Dumps should be identical when data has not changed I can detect and run mysqldump as external command but that adds an extra system requirement and I need to parse the output in order to remove headers and footers with dump information I don't need (such as server version or dump date). I'd love to keep my script as simple as I can so it can be hold in an standalone file. What are my alternatives?

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• How to "flick" a UIImageView?

  - by Meltemi

  I've got some UIViews that I'd like the user to be able to "flick" across the screen. They're not scroll views. They simply contain a raster image (png). Can anyone point me to some sample code, etc to help get me started? Something a little more heavyweight than "MoveMe" out there that helps detect a "flick" (vs a "nudge" or a drag and drop) and then carries the view off in the direction of the "flick"? OpenGL probably overkill. If possible I'd like to stay w/in the realm of Core Graphics/Animation.

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• Semantic errors

  - by gautam kumar

  Can semantic errors be detected by the compiler or not? If not when do the errors get detected? As far as I know semantic errors are those errors which result from the expressions involving operators with incorrect number/type of operands. For example: n3=n1*n2;//n1 is integer, n2 is a string, n3 is an integer The above statement is semantically incorrect. But while reading C Primer Plus by Stephen Prata I found the following statement The compiler does not detect semantic errors, because they don't violate C rules. The compiler has no way of divining your true intentions. That leaves it to you to find these kinds of errors. One way is to compare what a program does to what you expected it to do. If not the compiler, who detects those errors? Am I missing something?

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• Detecting coincident subset of two coincident line segments

  - by Jared Updike

  This question is related to: How do I determine the intersection point of two lines in GDI+? (great explanation of algebra but no code) How do you detect where two line segments intersect? (accepted answer doesn't actually work) But note that an interesting sub-problem is completely glossed over in most solutions which just return null for the coincident case even though there are three sub-cases: coincident but do not overlap touching just points and coincident overlap/coincident line sub-segment For example we could design a C# function like this: public static PointF[] Intersection(PointF a1, PointF a2, PointF b1, PointF b2) where (a1,a2) is one line segment and (b1,b2) is another. This function would need to cover all the weird cases that most implementations or explanations gloss over. In order to account for the weirdness of coincident lines, the function could return an array of PointF's: zero result points (or null) if the lines are parallel or do not intersect (infinite lines intersect but line segments are disjoint, or lines are parallel) one result point (containing the intersection location) if they do intersect or if they are coincident at one point two result points (for the overlapping part of the line segments) if the two lines are coincident

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• How can I receive the "scroll box" type scroll events from a DataGridView?

  - by Simon

  I have a DataGridView, and I'm listening to its Scroll event. This gives me a ScrollEventArgs object whose Type member is supposed to tell me the type of scroll event that has occurred. On the MSDN documentation page it says I should be able to detect movement of the scroll box by listening for events with types ThumbPosition, ThumbTrack, First, Last and EndScroll. However, when I drag the scroll box, I only get events of type LargeDecrement and LargeIncrement. How do I get access to the ThumbPosition, ThumbTrack, First, Last and EndScroll events?

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