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  • How can I dispatch an PropertyChanged event from a subscription to an Interval based IObservable

    - by James Hay
    I'm getting an 'UnauthorizedAccesExpection - Invalid cross-thread access' exception when I try to raise a PropertyChanged event from within a subscription to an IObservable collection created through Observable.Interval(). With my limited threading knowledge I'm assuming that the interval is happening on some other thread while the event wants to happen on the UI thread??? An explanation of the problem would be very useful. The code looks a little like: var subscriber = Observable.Interval(TimeSpan.FromSeconds(1)) .Subscribe(x => { Prop = x; // setting property raises a PropertyChanged event }); Any solutions?

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  • Three coworkers Riddle Problem

    - by John S
    This isn't homework, I've got a solution, however it doesn't protect against cheaters. Three coworkers would like to know their average salary. However, they are self-conscious and don't want to tell each other their own salaries, for fear of either being ridiculed or getting their houses robbed. How can they find their average salary, without disclosing their own salaries? Now, a solution that requires the last person to tell the group the sum isn't allowed because that person could cheat. Solution: http://karavi.wordpress.com/2009/12/18/solutions-to-wu%E2%80%99s-puzzles-and-riddles-ghetto-encryption-2-medium/

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  • Activity tracking usecase for login tracking.

    - by Mdillion
    Creating an activity tracking system for a social site. All user activiti from pooint of login til logoff are to be tracked. This means the first use case is the user's login. Every activity will have the same format so once I figure out how to track one activity then I can create chema for all activities. Currently for login I have steps like: Two solutions I have: Activity 1: User attempts to login Activity 2 A: User has successfully logged in Activity 2 B: User failed to login. Activity 2 B A: User failed to login due to invalid password Activity 2 B B: User failed to login due to locked account. OR Activty 1: User login - with result = Pass or Fail and if Fail reason = flag_id of reason. Accordingly I have to create the schema. For now I have it like this: activity_id object_id (fk) session_id (fk) user_id (fk) flag_id (fk) created_dt friend_id (fk) result (pass/fail) But ofcourse this a work in progress.

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  • jQTouch Spinning Wheel (Cubiq) Implementation Won't Work

    - by Peter
    I am trying to get a nice Spinning Wheel working within my webapp; http://bit.ly/89oWud However, I keep receiving an error within Mobile Safari that the variable 'blabla' cannot be found. I have implemented both of these suggested solutions: 1# Change SpinningWheelCSS 2# Change JQTouch CSS, JS files, and add JQTouch wrapper to body Neither worked for me. I am trying to use the incredible Spinning Wheel by Cubiq.org. I'm likely doing something wrong, but for the life of me I can't figure out what it is. Help is very much appreciated.

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  • What is the best database for my needs?

    - by Mr. Flibble
    I am currently using MS SQL Server 2008 but I'm not sure it it is the best system for this particular task. I have a single table like so: PK_ptA PK_ptB DateInserted LookupColA LookupColB ... LookupColF DataCol (ntext) A common query is SELECT TOP(1000000) DataCol FROM table WHERE LookupColA=x AND LookupColD=y AND LookupColE=z ORDER BY DateInserted DESC The table has about a billion rows with 5 million inserted per day. My main problem with SQL Server is that it isn't too easy to shard or spread out the datafiles. Also, exporting seems to max out at 1000rows per second (about 1MB/s) which seems very slow. Another problem I have is, with SQL Server, if I want to add a new LookupCol the log file grows enormously requiring a large amount of rarely used free space on tap. Are there any obvious better solutions for this problem?

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  • Open source license for test code

    - by Gary
    I'm creating a project to house an iPhone library for common code for the iPhone... essentially it's a library that'll save people from finding solutions to common problems that amount to copying and pasting snippets of code. The site is located here: http://code.google.com/p/devkit-bb/ I licensed it under Eclipse, because fosters the extension of the library without requiring constraints like LGPL on object files being provided/made available, which would be the case since everything is statically linked. What I'm wondering is how/what license to apply to the unit tests? Since they essentially demonstrate how to use various interfaces and components. Thus they're designed for potential copy and paste situations, and I don't want people who might end up using this as part of the building blocks of their environment to feel like the license would prohibit that "derivative work", ie. their application or game.

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  • How do I change the background color of the column with the expanders in Eclipse?

    - by Pridkett
    Recently after scorching my retinas from the garish white background in Eclipse, I found some of the excellent posts about how to change the colors so it uses sane (i.e. dark background) colors in the editor. However, one problem present in all solutions is that background of the column with the expanders for code folding is always white. Is there a way to change the background of that column? Here's a screenshot of the problem: I'm not the only person that has this problem, as shown in the screenshots for the following questions: Dark Color Scheme for Eclipse Color Themes for Eclipse (application of color schemes results in this issue on a Mac, no idea about PC) I know that the problem is not language specific as it happens in Java, Python, HTML, and everything else. Any hints on where in the pages of preferences this setting is?

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  • How to implement UIViewController rotation in response to orientation changes?

    - by Greg Maletic
    My app has about 10 different UIViewControllers, just one of which I want to switch to landscape mode if the device is rotated. (All the rest, I want to keep in portrait.) In order to implement rotation on that one view, I needed to implement its controller's 'shouldAutorotate' method and return YES. Since this view is accessed via a navigation controller, I also needed to create a subclass of UINavigationController that implements 'shouldAutorotate' and return YES. This solution works, but too well. I find that all of the UIViewControllers I push onto my subclass of UINavigationController respond to rotation, even if I implement 'shouldAutorotate' and return NO. (Remember: I only want one particular UIViewController to respond to rotation, not every one in the navigation controller's stack.) So, my question is: how do I best do this? All the solutions I can come up with seem 1) cumbersome, and 2) worse, don't seem to work. Thanks very much.

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  • SIMPLE Bug Tracking Suggestions?

    - by mauriciopastrana
    Any suggestions for good, solid, bug tracking solutions that let me (and company members) document bugs in 1-or-2-click steps? Basically I grew tired of all the overhead Mantis brings in... All I need is a list (do away with assign/status/priority/notes, phew! we're a small company!). I'm tempted to write it up in CakePHP, but before I do so, i'd love to know if there's something out there. Points if its free or web2-"ish". Cheers, Thx. /mp

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  • Convert a Mysql database from latin to UTF-8

    - by Matthieu
    I am converting a website from ISO to UTF-8, so I need to convert the Mysql database too. On internet, I read various solutions, I don't know wich one to choose. Do I really need to convert my varchar columns to binary, then to utf8 like that : ALTER TABLE t MODIFY col BINARY(150); ALTER TABLE t MODIFY col CHAR(150) CHARACTER SET utf8; This is long to do that for each column, of each table, of each database. I have 10 database, wich 20 tables each, wich around 2 - 3 varchar colums (2 queries each column), this gives me around 1000 queries to write ! How come ? How to do ?

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  • Asynchronous Processing = Spanning Threads = Valid?

    - by jens
    Hello Experts, am I allowed (without any sideeffects) to create and start a new Thread() from within a doGet() Method of a servlet? Or does this somehow leak ressources? Is it valid to also pass the "Session" Object into the Thread to later save the result of my asynchronous processing (I will synchronized correctly) in the session? Or will this leak ressources when using the session "in indepedant threads"? = What would happen if the session meanwhile would be expired by the webcontainer as it has timedout and I will access it from my thread? Or would could this also lead to the sideffect, that storing the session in the thread will prevent the webcontainer from expiring the session at all (and therefore finally leak ressources as the sessions do not get cleared up)? (I know there are other Solutions, like working with DB-(Job)Records, JMS or Servlets 3.0) but I need so solve the problem as described by spanning a new Thread within doGet.) Thank you very much!! Jens

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  • Wishlist for Objective-C IDE/Xcode ?

    - by Null Pointer
    My company is evaluating the possibility of developing set of tools for Objective-C extending Xcode default functionality(basically we are thinking about providing better navigation,semantic search, more refactorings, quick fixes, improved code completion (visual assist inspired). So we would like to ask XCode/Objective-C developers: Do you feel that you are missing some features in XCode? What is your wish list? Are you considering the possibility of using addons to Xcode which are not created by Apple? Would you be willing to pay for these addons, or would you only consider free solutions?

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  • Tracking unique versions of files with hashes

    - by rwmnau
    I'm going to be tracking different versions of potentially millions of different files, and my intent is to hash them to determine I've already seen that particular version of the file. Currently, I'm only using MD5 (the product is still in development, so it's never dealt with millions of files yet), which is clearly not long enough to avoid collisions. However, here's my question - Am I more likely to avoid collisions if I hash the file using two different methods and store both hashes (say, SHA1 and MD5), or if I pick a single, longer hash (like SHA256) and rely on that alone? I know option 1 has 288 hash bits and option 2 has only 256, but assume my two choices are the same total hash length. Since I'm dealing with potentially millions of files (and multiple versions of those files over time), I'd like to do what I can to avoid collisions. However, CPU time isn't (completely) free, so I'm interested in how the community feels about the tradeoff - is adding more bits to my hash proportionally more expensive to compute, and are there any advantages to multiple different hashes as opposed to a single, longer hash, given an equal number of bits in both solutions?

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  • Rails: simple bundler question with ruby-openid

    - by Joern Akkermann
    Hi! I just installed the ruby-openid gem and then bundled it by entering gem 'ruby-openid', :require => 'openid' in the gemfile. Then I started bundle install and bundle lock. Everything worked fine so far. But how can I now access the classes of ruby-openid. OpenID::method won't work for me. It raises a not found error. What have I forgot or done wrong? I'm absolutely new to bundler and the internet full of solutions for various versions, but I need one solution that's surely working. I'm thankful for any help!

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  • Repeater itemdatabound event value type and reference type

    - by Sune
    Im trying to bind a list with datetime objects to my repeater. if (e.Item.ItemType == ListItemType.AlternatingItem || e.Item.ItemType == ListItemType.Item) { DateTime actualDate = e.Item.DataItem as DateTime; } When I want access the itemdatabound event on the repeater Then I get an errormessage which says that DateTime is a valuetype and not a reference type. My solution is that a wrap the datetime in a custom object (reference type) and pass that to the repeater datasource instead of the datetime. But Im wondering if there are other solutions where the repeater takes valuetypes (DateTime objects)........

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  • How can I install xpdf on a Godaddy Linux shared hosting server?

    - by Andrew
    I'm having trouble determining if it's possible, based on the amount of access I have to my Godaddy server, to install XPDF. Could someone shed some light on this? Here's the link to XPDF. And here is info about the GoDaddy server. My goal is to convert PDF's to Plain Text automatically using a PHP script on the server. So far, other solutions like code posted in the comments of the PHP website have been insufficient. All research seems to point to XPDF.

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  • Outputting Javascript from PHP?

    - by Aristotle
    Are there any libraries or tools specifically designed to help PHP programmers write Javascript? Essentially, converting the PHP logic into Javascript logic. For instance: $myFoo = $document->getElementById("foo"); $myFoo->value = "Hello World"; Being converted into the following output: var myFoo = document.getElementById("foo"); myFoo.value = "Hello World"; Of course it would be excellent if more complicated solutions could be derived too, perhaps converting objects and internal methods into javascript-objects, etc.

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  • A way to measure performance

    - by Andrei Ciobanu
    Given Exercise 14 from 99 Haskell Problems: (*) Duplicate the elements of a list. Eg.: *Main> dupli''' [1..10] [1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10] I've implemented 4 solutions: {-- my first attempt --} dupli :: [a] -> [a] dupli [] = [] dupli (x:xs) = replicate 2 x ++ dupli xs {-- using concatMap and replicate --} dupli' :: [a] -> [a] dupli' xs = concatMap (replicate 2) xs {-- usign foldl --} dupli'' :: [a] -> [a] dupli'' xs = foldl (\acc x -> acc ++ [x,x]) [] xs {-- using foldl 2 --} dupli''' :: [a] -> [a] dupli''' xs = reverse $ foldl (\acc x -> x:x:acc) [] xs Still, I don't know how to really measure performance . So what's the recommended function (from the above list) in terms of performance . Any suggestions ?

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  • My website is infected with JS:ScriptIP-inf [Trj]

    - by Rizwan Aaqil
    I am using Network Solutions hosting. I was recently attacked with JS:Illredir-S [Trj], I asked my hosting providers to clean it and they cleaned it and updated all passwords, but now after a week my site got infected again with JS:ScriptIP-inf [Trj]. Can anyone please suggest me how to secure my website properly ? Should I change my hosting provider ? I am fed up of these viruses again and again on my websites. I can't even find this virus in my files. Please post informative answers. Thanks

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  • My Javascript Object is too big

    - by Kubi
    I am creating a really big javascript object on page load. I am getting no error on firefox but on Internet Explorer I am getting an error saying that- Stop running this script ? A script on this page is causing your web browser to run slowly. If it continues to run, your computer might become unresponsive. Is there any size limit for Javascript objects in Internet Explorer ? Any other solutions but not dividing the object ? Any help would be greatly appreciated,

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  • My Javascript Object is too big

    - by Kubi
    I am creating a really big javascript object on page load. I am getting no error on firefox but on Internet Explorer I am getting an error saying that- Stop running this script ? A script on this page is causing your web browser to run slowly. If it continues to run, your computer might become unresponsive. Is there any size limit for Javascript objects in Internet Explorer ? Any other solutions but not dividing the object ? Any help would be greatly appreciated,

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  • Data denormalization and C# objects DB serialization

    - by Robert Koritnik
    I'm using a DB table with various different entities. This means that I can't have an arbitrary number of fields in it to save all kinds of different entities. I want instead save just the most important fields (dates, reference IDs - kind of foreign key to various other tables, most important text fields etc.) and an additional text field where I'd like to store more complete object data. the most obvious solution would be to use XML strings and store those. The second most obvious choice would be JSON, that usually shorter and probably also faster to serialize/deserialize... And is probably also faster. But is it really? My objects also wouldn't need to be strictly serializable, because JsonSerializer is usually able to serialize anything. Even anonymous objects, that may as well be used here. What would be the most optimal solution to solve this problem? Additional info My DB is highly normalised and I'm using Entity Framework, but for the purpose of having external super-fast fulltext search functionality I'm sacrificing a bit DB denormalisation. Just for the info I'm using SphinxSE on top of MySql. Sphinx would return row IDs that I would use to fast query my index optimised conglomerate table to get most important data from it much much faster than querying multiple tables all over my DB. My table would have columns like: RowID (auto increment) EntityID (of the actual entity - but not directly related because this would have to point to different tables) EntityType (so I would be able to get the actual entity if needed) DateAdded (record timestamp when it's been added into this table) Title Metadata (serialized data related to particular entity type) This table would be indexed with SPHINX indexer. When I would search for data using this indexer I would provide a series of EntityIDs and a limit date. Indexer would have to return a very limited paged amount of RowIDs ordered by DateAdded (descending). I would then just join these RowIDs to my table and get relevant results. So this won't actually be full text search but a filtering search. Getting RowIDs would be very fast this way and getting results back from the table would be much faster than comparing EntityIDs and DateAdded comparisons even though they would be properly indexed.

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  • What causes the error "Can't execute code from a freed script"

    - by tjrobinson
    I thought I'd found the solution a while ago (see my blog): If you ever get the JavaScript (or should that be JScript) error "Can't execute code from a freed script" - try moving any meta tags in the head so that they're before your script tags. ...but based on one of the most recent blog comments, the fix I suggested may not work for everyone. I thought this would be a good one to open up to the StackOverflow community.... What causes the error "Can't execute code from a freed script" and what are the solutions/workarounds?

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  • as3 loops and event listeners

    - by Ross
    I have an array that returns multidimensional data from an mysql database, when this is collected the createNews function creates the user interface. The problem I am having is the loop is iterating quicker than the ui is being created, is there a way to use event listeners with loops so it only continues after my function has completed its work. Any solutions or ideas are much appreciated; Thanks, R. var t:Array = responds.serverInfo.initialData; for (var i:uint = 0; i < t.length; i++) { var date = t[i][1]; var newstitle = t[i][2]; var story= t[i][3]; var image = t[i][4]; createNews(date, newstitle, story, image); }

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  • Succinct introduction to C++/CLI for C#/Haskell/F#/JS/C++/... programmer

    - by Henrik
    Hello everybody, I'm trying to write integrations with the operating system and with things like active directory and Ocropus. I know a bunch of programming languages, including those listed in the title. I'm trying to learn exactly how C++/CLI works, but can't find succinct, exact and accurate descriptions online from the searching that I have done. So I ask here. Could you tell me the pitfalls and features of C++/CLI? Assume I know all of C# and start from there. I'm not an expert in C++, so some of my questions' answers might be "just like C++", but could say that I am at C#. I would like to know things like: Converting C++ pointers to CLI pointers, Any differences in passing by value/doubly indirect pointers/CLI pointers from C#/C++ and what is 'recommended'. How do gcnew, __gc, __nogc work with Polymorphism Structs Inner classes Interfaces The "fixed" keyword; does that exist? Compiling DLLs loaded into the kernel with C++/CLI possible? Loaded as device drivers? Invoked by the kernel? What does this mean anyway (i.e. to load something into the kernel exactly; how do I know if it is?)? L"my string" versus "my string"? wchar_t? How many types of chars are there? Are we safe in treating chars as uint32s or what should one treat them as to guarantee language indifference in code? Finalizers (~ClassName() {}) are discouraged in C# because there are no garantuees they will run deterministically, but since in C++ I have to use "delete" or use copy-c'tors as to stack allocate memory, what are the recommendations between C#/C++ interactions? What are the pitfalls when using reflection in C++/CLI? How well does C++/CLI work with the IDisposable pattern and with SafeHandle, SafeHandleZeroOrMinusOneIsInvalid? I've read briefly about asynchronous exceptions when doing DMA-operations, what are these? Are there limitations you impose upon yourself when using C++ with CLI integration rather than just doing plain C++? Attributes in C++ similar to Attributes in C#? Can I use the full meta-programming patterns available in C++ through templates now and still have it compile like ordinary C++? Have you tried writing C++/CLI with boost? What are the optimal ways of interfacing the boost library with C++/CLI; can you give me an example of passing a lambda expression to an iterator/foldr function? What is the preferred way of exception handling? Can C++/CLI catch managed exceptions now? How well does dynamic IL generation work with C++/CLI? Does it run on Mono? Any other things I ought to know about?

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