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• How to make an existing socket fail?

  - by Huckphin

  OK. So, this is exactly the opposite of what everyone asks about in network programming. Usually, people ask how to make a broken socket work. I, on the other hand am looking for the opposite. I currently have sockets working fine, and want them to break to re-create this problem we are seeing. I am not sure how to go about intentionally making the socket fail by having a bad read. The trick is this: The socket needs to be a working, established connection, and then it must fail for whatever reason. I'm writing this in C and the drivers are running on a Linux system. The sockets are handled by a non-IP Level 3 protocol in Linux by a Linux Device Driver. I have full access to all of the code-base, I just need to find a way to tease it out so that it can fail. Any ideas?

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• Using jquery scrollTop to position absolute Div

  - by Tim

  Hello, I am trying to position an Absolute DIV using Jquery, depending on where the user is clicking on the page. At the moment this works just great $('#window').css('left', jsEvent.pageX); $('#window').css('top', jsEvent.pageY); This positions the element exactly where my mouse has clicked the screen... Until you scroll down that is. That is why I am trying to achieve something that will take the amount of pixels from the top of the page into account. I thought something like this... $('#window').css('top', jsEvent.pageY + scrollTop()); would do the trick, unfortunately it doesn't work. Any hints? Thanks, Tim

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• IPhone XCode programming: view called from a navigation view doesn't set its IBOutlet attributes

  - by Antonio Murgia

  I created a view Called ProgrammaView that appears when a row of a table is clicked. This view has a UILabel, a UIImageView and a UITextView. Now. ProgrammaView's Outlets have to be changed by the parameter passed to a method of the view called iniz. in this image there is first the ProgrammaView.h and then the method iniz. The problem is that the label and other stuff doesn't change! I checked 3 million times that everything between the xib file and the controller is linked. The trick to call iniz in the other viewcontrollers works well in other part of the program so i think is not that the problem. Thank you in advance!

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• In python: how to apply itertools.product to elements of a list of lists

  - by Guilherme Rocha

  I have a list of arrays and I would like to get the cartesian product of the elements in the arrays. I will use an example to make this more concrete... itertools.product seems to do the trick but I am stuck in a little detail. arrays = [(-1,+1), (-2,+2), (-3,+3)]; If I do cp = list(itertools.product(arrays)); I get cp = cp0 = [((-1, 1),), ((-2, 2),), ((-3, 3),)] But what I want to get is cp1 = [(-1,-2,-3), (-1,-2,+3), (-1,+2,-3), (-1,+2,+3), ..., (+1,+2,-3), (+1,+2,+3)]. I have tried a few different things: cp = list(itertools.product(itertools.islice(arrays, len(arrays)))); cp = list(itertools.product(iter(arrays, len(arrays)))); They all gave me cp0 instead of cp1. Any ideas? Thanks in advance.

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• Prevent multiple logons for a single user in ASP .Net

  - by ilivewithian

  I am looking at how best to prevent a single user account logging on multiple times in a webforms application. I know that MembershipUser.IsOnline exists, but I've read a few forum and blog entries suggesting that this can be unreliable, particularly in scenarios where a user closes a browser (without logging out) and attempts to logon with a different machine or browser. I looked at implementing a last past the post type system; when a user logs on older users are simply kicked off. It seems that FormsAuthentication.Signout() only works for the current user. Am I missing a trick, is there a better way to prevent the same username logging on from multiple different locations?

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• Hadoop on windows server

  - by Luca Martinetti

  Hello, I'm thinking about using hadoop to process large text files on my existing windows 2003 servers (about 10 quad core machines with 16gb of RAM) The questions are: Is there any good tutorial on how to configure an hadoop cluster on windows? What are the requirements? java + cygwin + sshd ? Anything else? HDFS, does it play nice on windows? I'd like to use hadoop in streaming mode. Any advice, tool or trick to develop my own mapper / reducers in c#? What do you use for submitting and monitoring the jobs? Thanks

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• C# / Winforms - Visually remove button click event

  - by Wayne Koorts

  .NET newbie alert Using Visual C# 2008 Express Edition I have accidentally created a click event for a button. I then deleted the automatically-created method code, which resulted in an error saying that the function, which had now been referenced in the form loading code, could no longer be found. Deleting the following line from the Form1.Designer.cs file's InitializeComponent() function... this.btnCopy.Click += new System.EventHandler(this.btnCopy_Click); ... seems to do the trick, however, it makes me feel very dirty because of the following warning at the beginning of the #region: /// Required method for Designer support - do not modify /// the contents of this method with the code editor. I haven't been able to find a way to do this using the form designer, which I assume is the means implied by this warning. What is the correct way to do this?

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• Intersecting boundaries with lucene

  - by Silvio Donnini

  I'm using Lucene, and I'm trying to find a way to index and retrieve documents that have a ranged property. For example I have: Document 1: Price:[30 TO 50] Document 2: Price:[45 TO 60] Document 3: Price:[60 TO 70] And I would like to search for all the documents whose ranges intersect a specific interval, in the above example, if I search for Price in [55 TO 65] I should get Document 2 and Document 3 as results. I don't think NumericRangeQueries alone would do the trick, I need to work on the index with something similar to R-trees, but are they implemented in Lucene? Also, I suppose that what I need should be a subclass of MultiTermQuery, because the query Price in [55 TO 65] has two boundaries, but I don't see anything suitable among MultiTermQuery's subclasses. Any help is appreciated, thanks, Silvio P.S. I'm using Lucene 2.9.0, but I can update to the latest release if needed.

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• Invert regexp in vim

  - by Chris J

  There's a few "how do I invert a regexp" questions here on stackoverflow, but I can't find one for vim (if it does exist, by goggle-fu is lacking today). In essence I want to match all non-printable characters and delete them. I could write a short script, or drop to a shell and use tr or something similar to delete, but a vim solution would be dandy :-) Vim has the atom \p to match printable characters, however trying to do this :s/[^\p]//g to match the inverse failed and just left me with every 'p' in the file. I've seen the (?!xxx) sequence in other questions, and vim seems to not recognise this sequence. I've not found seen an atom for non-printable chars. In the interim, I'm going to drop to external tools, but if anyone's got any trick up their sleeve to do this, it'd be welcome :-) Ta!

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• Service Call very slow if going through HttpHandler

  - by JohnIdol

  I have a WCF client pointing to a WebSphere service. All is good in normal situation except when my calls to the service originate from an HttpHandler - in this case the calls are extremely slow (it takes up to 10 times longer). If I send the exact same envelopes through Soap-UI or without an HttpHandler it's all good. If the envelope is the same the only thing left is the HttpHeader. Would the fact that I am going through an HttpHandler cause changes HttpHeaders compared to normal scenarios? What should I be looking for and is there some config setting that might do the trick? Any help appreciated!

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• How to refresh to entire device's screen (Windows Mobile)?

  - by walidad

  Hi everybody, I'm working on a simple application that draws an alpha-blended picture on the screen's Device Context every 2 secs, I want to refresh the screen contents before the drawing operation (To erase the drawn pic), I have used many many trick but unfortunately, the screen won't refresh correctly, some regions still keep portions of the drawn pic I'm really frustrated from this issue :( These are the sources codes I have used, I'm using C# SendMessage(HWND_BROADCAST, WM_SYSCOLORCHANGE, IntPtr.Zero, IntPtr.Zero); // wasted time in the refreshing process is enough to keep this. UpdateWindow(HWND_BROADCAST);// does not work at all! InvalidateRect(IntPtr.Zero,IntPtr.Zero,true); // the same goes here. SendMessage(HWND_BROADCAST, WM_PAINT, IntPtr.Zero, IntPtr.Zero); // pfffff ! SendMessage(HWND_BROADCAST, WM_SETTINGCHANGE, new IntPtr(SPI_SETNONCLIENTMETRICS), IntPtr.Zero); // trying to refresh the explorer, no resutl I used also EnumWindows and call back , very slow and does not fit my case. I wanna refresh the whole screen Help please! Regards Waleed

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• Making a vertically scrolling parent div which does not cause overflow of children

  - by marq

  I have something as follows: <div style="float: left; height: 20px; overflow-y: scroll"> <div>hello this is a test</div> <div>hello this is another test</div> <div>t1</div> <div>t2</div> <div>t3</div> </div> The parent div grows to the appropriate width to fit the largest child (which is what I want). However, the vertical scrollbar causes the inner width to be smaller, which causes the largest child to wrap. Is there a way to get the parent to grow to the width of the largest child + the width of the scroll bar? I've tried every margin trick I know, but nothing.

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• Is it possible to implement a GC.GetAliveInstancesOf<T>() (for use in debugging)?

  - by Omer Raviv

  Hi, I know this was answered before, but I'd like to pose a somewhat different question. Is there any conceivable way to implement GC.GetAliveInstancesOf(), that can be evaluated in Visual Studio Debug Watch window? Sasha Goldstein shows one solution in this article, but it requires every class you want to query inherit from a specific base class. I'll emphasize that I only want to use this method during debugging, so I don't care that the GC may change an object's address in memory during runtime. One idea might be to somehow harness the !dumpheap –type command of SOS, and do some magic trick to create a temporary variable and have it point out to the memory address printed by SOS. Does anyone have a solution that works?

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• graphviz segmentation fault

  - by LucaB

  Hi I'm building a graph with many nodes, around 3000. I wrote a simple python program to do the trick with graphviz, but it gives me segmentation fault and I don't know why, if the graph is too big or if i'm missing something. The code is: #!/usr/bin/env python # Import graphviz import sys sys.path.append('..') sys.path.append('/usr/lib/graphviz') import gv # Import pygraph from pygraph.classes.graph import graph from pygraph.classes.digraph import digraph from pygraph.algorithms.searching import breadth_first_search from pygraph.readwrite.dot import write # Graph creation gr = graph() file = open('nodes.dat', 'r') line = file.readline() while line: gr.add_nodes([line[0:-1]]) line = file.readline() file.close() print 'nodes finished, beginning edges' edges = open('edges_ok.dat', 'r') edge = edges.readline() while edge: gr.add_edge((edge.split()[0], edge.split()[1])) edge = edges.readline() edges.close() print 'edges finished' print 'Drawing' # Draw as PNG dot = write(gr) gvv = gv.readstring(dot) gv.layout(gvv,'dot') gv.render(gvv,'svg','graph.svg') and it crashes at the gv.layout() call. The files are somthing like: nodes: node1 node2 node3 edges_ok: node1 node2 node2 node3

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• OpenFileDialog - only display filenames that have no extensions

  - by fraXis

  Hello, I have the following code in my C# program: OpenFileDialog fDialog = new OpenFileDialog(); fDialog.Title = "Open a file"; fDialog.Filter = "NCF files (*.ncf)|*.ncf|All files (*.*)|*.*|No Extensions (*.)|*."; I want to be able to have the user pick from the following: .NCF (files with .NCF extension only) *.* (all files) and files that have no extensions such as: readme (with no .txt) I know *.* will do this, but it also displays the .NCF, .TXT, and all other files in the same directory. I just want to be able to display filenames that have no extensions. Filtering with *. does not do the trick. Is there a way I can do this with C#? Thanks.

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• Text rendering blurred in Firefox and Internet Explorer using jQuery

  - by Sixfoot Studio

  Not sure what causes this? If I user slideDown in Firefox the text rendering cuts off the top of the letters before the animation is complete. This is ok in IE. If I then change the animation to use fadeIn instead, the blur does not happen in Firefox but the text is very jagged in IE. From another question I have asked in the past pertaining to animation, the guy told me that I should wrap that which I want to animate in another DIV and animate that instead. This sorted out the jerkiness caused by the padding on the content inside the .animateDiv. Is there a trick to the text rendering as well in jQuery

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• Help with SQL query (list strings and count in same query)

  - by Mestika

  Hi everybody, I’m working on a small kind of log system to a webpage, and I’m having some difficulties with a query I want to do multiple things. I have tried to do some nested / subqueries but can’t seem to get it right. I’ve two tables: User = {userid: int, username} Registered = {userid: int, favoriteid: int} What I need is a query to list all the userid’s and the usernames of each user. In addition, I also need to count the total number of favoriteid’s the user is registered with. A user who is not registered for any favorite must also be listed, but with the favorite count shown as zero. I hope that I have explained my request probably but otherwise please write back so I can elaborate. By the way, the query I’ve tried with look like this: SELECT user.userid, user.username FROM user,registered WHERE user.userid = registered.userid(SELECT COUNT(favoriteid) FROM registered) However, it doesn’t do the trick, unfortunately Kind regards Mestika

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• When is a C++ terminate handler the Right Thing(TM)?

  - by Joseph Garvin

  The C++ standard provides the std::set_terminate function which lets you specify what function std::terminate should actually call. std::terminate should only get called in dire circumstances, and sure enough the situations the standard describes for when it's called are dire (e.g. an uncaught exception). When std::terminate does get called the situation seems analagous to being out of memory -- there's not really much you can sensically do. I've read that it can be used to make sure resources are freed -- but for the majority of resources this should be handled automatically by the OS when the process exits (e.g. file handles). Theoretically I can see a case for if say, you needed to send a server a specific message when exiting due to a crash. But the majority of the time the OS handling should be sufficient. When is using a terminate handler the Right Thing(TM)? Update: People interested in what can be done with custom terminate handlers might find this non-portable trick useful.

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• (External) Java library for creating Tree structure ?

  - by suVasH.....

  I am planning to implement a tree structure where every node has two children and a parent along with various other node properties (and I'd want to do this in Java ) Now, the way to it probably is to create the node such that it links to other nodes ( linked list trick ), but I was wondering if there is any good external library to handle all this low level stuff. ( for eg. the ease of stl::vector vs array in C++ ). I've heard of JDots, but still since i haven't started (and haven't programmed a lot in Java), I'd rather hear out before I begin.

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• How to browse a Matrix returned by the OpenCV2.0 Canny() function ?

  - by user290613

  Hi all, I've been browsing the web to get an answer but no way to put my hand on it. I call the Canny function that fills me a matrix Canny(src, dst, 220, 299, 3 ); the dst variable is now a Matrix that is according to me of type CV_8UC1, 8bit, 1channel. Now I would like to browse this matrix according to rows and columns, so there was a trick that I've seen on stackoverflow dst.at<uchar*>(3, 5) In my case it crashes. (Assertion Failed, unknown function, cxmat.hpp line 450) My matrix information are myMatrix.width() = 181 myMatrix.height() = 65 One more thing, when I do std::cout << dst.depth() << std::endl; It always retrieves me 0 and not 8 (which I guess Im suppose to get) Thank you very much for all who will reply,

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• Wmode transparent and symbols issue with foreign keyboard

  - by Boun

  Hello, I have the known issue with wmode transparent and input textfield in my page. I know that the question is often asked but I have a special situation with that case. I need to embed my swf with wmode=transparent but in my swf I have an input textfield and the bug with "@" or "." symbols exists. I have a french keyboard and I decided to overcome this problem with a string replacement with the FirefoxWmodeFix class from Manmaru (see the link below). http://www.manmaru.fr/mlab/?p=95 It works for my keyboard but I need that "trick" with EN/DE/IT keyboard. Could anyone help me with the right combination of keys on different keyboard and different OS system to display "@" and "." symbols. I don't have any foreign Windows system to get the key code for each combination. Or if anyone has another solution, I will be pleased to hear that one. Thanks in advance for any help.

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• How to shrink-to-fit an std::vector in a memory-efficient way?

  - by dehmann

  I would like to 'shrink-to-fit' an std::vector, to reduce its capacity to its exact size, so that additional memory is freed. The standard trick seems to be the one described here: template< typename T, class Allocator > void shrink_capacity(std::vector<T,Allocator>& v) { std::vector<T,Allocator>(v.begin(),v.end()).swap(v); } The whole point of shrink-to-fit is to save memory, but doesn't this method first create a deep copy and then swaps the instances? So at some point -- when the copy is constructed -- the memory usage is doubled? If that is the case, is there a more memory-friendly method of shrink-to-fit? (In my case the vector is really big and I cannot afford to have both the original plus a copy of it in memory at any time.)

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• How do you set the "global delimiter" in Excel using VBA?

  - by DanM

  I've noticed that if I use the text-to-columns feature with comma as the delimiter, any comma-delimited data I paste into Excel after that will be automatically split into columns. This makes me think Excel must have some kind of global delimiter. If this is true, how would I set this global delimiter using Excel VBA? Is it possible to do this directly, or do I need to "trick" Excel by doing a text-to-columns on some junk data, then delete the data? My ultimate goal is to be able to paste in a bunch of data from different files using a macro, and have Excel automatically split it into columns according to the delimiter I set.

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• How to find a programmer for my project?

  - by Al

  I'm building a web application to generate monthly subscription fees, but I've quickly realised I'm going to need some help with the project to finish it this century. I don't have any money upfront for a freelancer and every website I've found takes bids for project work. The tasks that need doing are flexible too because I can do whatever the other coder doesn't want to. I'm also happy to guide the developer and offer tips for performance/security/etc etc. My question is; how do I go about finding someone to work with on a profit-share basis? I'm sure there are a billion people like me with the "next killer app" but I genuinely believe in it. Can anyone offer some advice? Thanks in advance! EDIT: I guess the trick is to find someone passionate enough about the subject as I am. Where would I find someone? Are there websites that broker profit-share deals on programming work?

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• Deliberately adding bugs to assess QA processes

  - by bgbg

  How do you know that as many bugs as possiblle have been discovered and solved in a program? Couple of years ago I have read a document about debugging (I think it was some sort of HOWTO). Among other things, that document described a technique in which the programming team deliberately adds bugs into the code and passes it to the QA team. The QA process is considered completed when all the deliberately known bugs have been discovered. Unfortunately, I cannot find this document, or any similar one with description of this trick. Can someone please point me to such a document?

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