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• TypeError: coercing to Unicode: need string or buffer, User found

  - by Clemens

  hi, i have to crawl last.fm for users (university exercise). I'm new to python and get following error: Traceback (most recent call last): File "crawler.py", line 23, in <module> for f in user_.get_friends(limit='200'): File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/pylast.py", line 2717, in get_friends for node in _collect_nodes(limit, self, "user.getFriends", False): File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/pylast.py", line 3409, in _collect_nodes doc = sender._request(method_name, cacheable, params) File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/pylast.py", line 969, in _request return _Request(self.network, method_name, params).execute(cacheable) File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/pylast.py", line 721, in __init__ self.sign_it() File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/pylast.py", line 727, in sign_it self.params['api_sig'] = self._get_signature() File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/pylast.py", line 740, in _get_signature string += self.params[name] TypeError: coercing to Unicode: need string or buffer, User found i use the pylast lib for crawling. what i want to do: i want to get a users friends and the friends of the users friends. the error occurs, when i have a for loop in another for loop. here's the code: network = pylast.get_lastfm_network(api_key = API_KEY, api_secret = API_SECRET, username = username, password_hash = password_hash) user = network.get_user("vidarnelson") friends = user.get_friends(limit='200') i = 1 for friend in friends: user_ = network.get_user(friend) print '#%d %s' % (i, friend) i = i + 1 for f in user_.get_friends(limit='200'): print f any advice? thanks in advance. regards!

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• Programming R/Sweave for proper \Sexpr output

  - by deoksu

  Hi I'm having a bit of a problem programming R for Sweave, and the #rstats twitter group often points here, so I thought I'd put this question to the SO crowd. I'm an analyst- not a programmer- so go easy on me my first post. Here's the problem: I am drafting a survey report in Sweave with R and would like to report the marginal returns in line using \Sexpr{}. For example, rather than saying: Only 14% of respondents said 'X'. I want to write the report like this: Only \Sexpr{p.mean(variable)}$\%$ of respondents said 'X'. The problem is that Sweave() converts the results of the expression in \Sexpr{} to a character string, which means that the output from expression in R and the output that appears in my document are different. For example, above I use the function 'p.mean': p.mean<- function (x) {options(digits=1) mmm<-weighted.mean(x, weight=weight, na.rm=T) print(100*mmm) } In R, the output looks like this: p.mean(variable) >14 but when I use \Sexpr{p.mean(variable)}, I get an unrounded character string (in this case: 13.5857142857143) in my document. I have tried to limit the output of my function to 'digits=1' in the global environment, in the function itself, and and in various commands. It only seems to contain what R prints, not the character transformation that is the result of the expression and which eventually prints in the LaTeX file. as.character(p.mean(variable)) >[1] 14 >[1] "13.5857142857143" Does anyone know what I can do to limit the digits printed in the LaTeX file, either by reprogramming the R function or with a setting in Sweave or \Sexpr{}? I'd greatly appreciate any help you can give. Thanks, David

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• "Programming In Haskell" error in sat function

  - by Matt Ellen

  I'm in chapter 8 of Graham Hutton's Programming in Haskell and I'm copying the code and testing it in GHC. See the slides here: http://www.cis.syr.edu/~sueo/cis352/chapter8.pdf in particular slide 15 The relevant code I've copied so far is: type Parser a = String -> [(a, String)] pih_return :: a -> Parser a pih_return v = \inp -> [(v, inp)] failure :: Parser a failure = \inp -> [] item :: Parser Char item = \inp -> case inp of [] -> [] (x:xs) -> [(x,xs)] parse :: Parser a -> String -> [(a, String)] parse p inp = p inp sat :: (Char -> Bool) -> Parser Char sat p = do x <- item if p x then pih_return x else failure I have changed the name of the return function from the book to pih_return so that it doesn't clash with the Prelude return function. The errors are in the last function sat. I have copied this directly from the book. As you can probably see p is a function from Char to Bool (e.g. isDigit) and x is of type [(Char, String)], so that's the first error. Then pih_return takes a value v and returns [(v, inp)] where inp is a String. This causes an error in sat because the v being passed is x which is not a Char. I have come up with this solution, by explicitly including inp into sat sat :: (Char -> Bool) -> Parser Char sat p inp = do x <- item inp if p (fst x) then pih_return (fst x) inp else failure inp Is this the best way to solve the issue?

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• User roles - why not store in session?

  - by Phil

  I'm porting an ASP.NET application to MVC and need to store two items relating to an authenitcated user: a list of roles and a list of visible item IDs, to determine what the user can or cannot see. We've used WSE with a web service in the past and this made things unbelievably complex and impossible to debug properly. Now we're ditching the web service I was looking foward to drastically simplifying the solution simply to store these things in the session. A colleague suggested using the roles and membership providers but on looking into this I've found a number of problems: a) It suffers from similar but different problems to WSE in that it has to be used in a very constrained way maing it tricky even to write tests; b) The only caching option for the RolesProvider is based on cookies which we've rejected on security grounds; c) It introduces no end of complications and extra unwanted baggage; All we want to do, in a nutshell, is store two string variables in a user's session or something equivalent in a secure way and refer to them when we need to. What seems to be a ten minute job has so far taken several days of investigation and to compound the problem we have now discovered that session IDs can apparently be faked, see http://blogs.sans.org/appsecstreetfighter/2009/06/14/session-attacks-and-aspnet-part-1/ I'm left thinking there is no easy way to do this very simple job, but I find that impossible to believe. Could anyone: a) provide simple information on how to make ASP.NET MVC sessions secure as I always believed they were? b) suggest another simple way to store these two string variables for a logged in user's roles etc. without having to replace one complex nightmare with another as described above? Thank you.

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• How do I expose the columns collection of GridView control that is inside a user control

  - by Christopher Edwards

  See edit. I want to be able to do this in the aspx that consumes the user control. <uc:MyControl ID="MyGrid" runat="server"> <asp:BoundField DataField="FirstColumn" HeaderText="FirstColumn" /> <asp:BoundField DataField="SecondColumn" HeaderText="SecondColumn" /> </uc> I have this code (which doesn't work). Any ideas what I am doing wrong? VB Partial Public Class MyControl Inherits UserControl <System.Web.UI.IDReferenceProperty(GetType(DataControlFieldCollection))> _ Public Property Columns() As DataControlFieldCollection Get Return MyGridView.Columns End Get Set(ByVal value As DataControlFieldCollection) ' The Columns collection of the GridView is ReadOnly, so I rebuild it MyGridView.Columns.Clear() For Each c As DataControlField In value MyGridView.Columns.Add(c) Next End Set End Property ... End Class C# public partial class MyControl : UserControl {         [System.Web.UI.IDReferenceProperty(typeof(DataControlFieldCollection))]     public DataControlFieldCollection Columns {         get { return MyGridView.Columns; }         set {             MyGridView.Columns.Clear();             foreach (DataControlField c in value) {                 MyGridView.Columns.Add(c);             }         }     } ... } EDIT: Actually it does work, but auto complete does not work between the uc:MyControl opening and closing tags and I get compiler warnings:- Content is not allowed between the opening and closing tags for element 'MyControl'. Validation (XHTML 1.0 Transitional): Element 'columns' is not supported. Element 'BoundField' is not a known element. This can occur if there is a compilation error in the Web site, or the web.config file is missing. So I guess I need to use some sort of directive to tell the complier to expect content between the tags. Any ideas?

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• What AOP tools exist for doing aspect-oriented programming at the assembly language level against x8

  - by JohnnySoftware

  Looking for a tool I can use to do aspect-oriented programming at the assembly language level. For experimentation purposes, I would like the code weaver to operate native application level executable and dynamic link libraries. I have already done object-oriented AOP. I know assembly language for x86 and so forth. I would like to be able to do logging and other sorts of things using the familiar before/after/around constructs. I would like to be able to specify certain instructions or sequences/patterns of consecutive instructions as what to do a pointcut on since assembly/machine language is not exactly the most semantically rich computer language on the planet. If debugger and linker symbols are available, naturally, I would like to be able to use them to identify subroutines' entry points , branch/call/jump target addresses, symbolic data addresses, etc. I would like the ability to send notifications out to other diagnostic tools. Thus, support for sending data through connection-oriented sockets and datagrams is highly desirable. So is normal logging to files, UI, etc. This can be done using the action part of an aspect to make a function call, but then there are portability issues so the tool needs to support a flexible, well-abstracted logging/notifying mechanism with a clean, simple yet flexible. The goal is rapid-QA. The idea is to be able to share aspect source code braodly within communties as well as publicly. So, there needs to be a declarative security policy file that users can share. This insures that nothing untoward that is hidden directly or indirectly in an aspect source file slips by the execution manager. The policy file format needs to be simple to read, write, modify, understand, type-in, edit, and generate. Sort of like Java .policy files. Think the exact opposite of anything resembling XML Schema files and you get the idea. Is there such a tool in existence already?

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• User must have accepted TOS - Facebook Graph API error when posting photos to group page

  - by user370309

  Hi all, I've been struggling to upload an image from the user's computer and posted to our group page using the Facebook Graph API. I was able to send a post request to facebook with the image however, I'm getting this error back: ERROR: (#200) User must have accepted TOS. To some extent, I don't believe that I need the user to authorize himself as the photo is being uploaded to our group page. This below, is the code i'm using: if($albumId != null) { $args = array( 'message' = $description ); $args[basename($photoPath)] = '@' . realpath($photoPath); $ch = curl_init(); $url = 'https://graph.facebook.com/'.$albumId.'/photos?'.$token; curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_HEADER, false); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_POST, true); curl_setopt($ch, CURLOPT_POSTFIELDS, $args); curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0); $data = curl_exec($ch); $photoId = json_decode($data, true); if(isset($photoId['error'])) die('ERROR: '.$photoId['error']['message']); $temp = explode('.', sprintf('%f', $photoId['id'])); $photoId = $temp[0]; return $photoId; } Can somebody tell me if I need to request extra permissions from the user or what i'm doing wrong? Thanks very much!

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• "User Friendly" .net compatible Regex/Text matching tools?

  - by Binary Worrier

  Currently in our software we provide a hook where we call a DLL built by our clients to parse information out of documents we are processing (the DLL takes in some text (or a file) and returns a list of name/value pairs). e.g. We're given a Word doc or Text file to Archive. We do various things to the file, and call a DLL that will return "pertinent" information about the file. Among other things we store that "pertinent" data for posterity. What is considered "pertinent" depends on the client and the type of the document, we don't care, we get it and store it. I've been asked to develop a user friendly "something" that will allow a non-programmer user to "configure" how to get this data from a plain text document (<humor>The user story ends with the helpful suggestion/query "We could use regex for this?"</humor>) It's safe to assume that a list of regex's isn't going to cut this, I've written some of these parsers for customers, the regex's to do these would be hedious and some of them can't be done by regex's. Also one of the requirements above is "user friendly" which negates anything that has users seeing or editing regex expressions. As you can guess, I don't have a fortune of time to do this, and am wondering is there anything out there that I can plug in to our app that has a nice front end and does exactly what I need? :) No? Whadda mean no! . . . sigh Ok then failing that, anything out there that "visually" builds regex's and/or other pattern matching expressions, and then allows one to run those expressions against some text? The MS BRE will do what I want, but I need something prettier that looks less like code. Thanks guys,

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• Programming tips for writing document editors?

  - by Tesserex

  I'm asking this because I'm in the process of writing two such editors for my Mega Man engine, one a tileset editor, and another a level editor. When I say document editor, I mean the superset application type for things like image editors and text editors. All of these share things like toolbars, menu options, and in the case of image editors, and my apps, tool panes. We all know there's tons of advice out there for interface design in these apps, but I'm wondering about programming advice. Specifically, I'm doubting my code designs with the following things: Many menu options toggle various behaviors. What's the proper way to reliably tie the checked state of the option with the status of the behavior? Sometimes it's more complicated, like options being disabled when there's no document loaded. More and more consensus seems to be against using MDI, but how should I control tool panes? For example, I can't figure out how to get the panels to minimize and maximize along with the main window, like Photoshop does. When tool panels are responsible for a particular part of the document, who actually owns that thing? The main window, or the panel class? How do you do communication between the tool panels and the main window? Currently mine is all event based but it seems like there could be a better way. This seems to be a common class of gui application, but I've never seen specific pointers on code design for them. Could you please offer whatever advice or experience you have for writing them?

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• (rsErrorOpeningConnection) Could not obtain information about Windows NT group/user

  - by ChelleATL

  I am trying to deploy a report to the Reporting Services Server but keep running up against this error: An error occurred during client rendering. An error has occurred during report processing. (rsProcessingAborted) Cannot create a connection to data source 'dataSource1'. (rsErrorOpeningConnection) Could not obtain information about Windows NT group/user 'DOMAIN\useradmin', error code 0x5. Here’s my situation: Everything is being ran using DOMAIN\useradmin and the report is using a remote database. Reporting Services and SQL Server are both ran under DOMAIN\useradmin. DOMAIN\useradmin is a windows AD login and is part of the server machine Administrators group. My test report is using a data source model that in turn is using a data source that is connection to a database on a different SQL Server. The data source is using “Credentials stored securely in the report server” with the options “Use as Windows credentials when connecting to the data source” and “Impersonate the authenticated user after a connection has been made to the data source.” I am using the credentials of DOMAIN\useradmin that is the db owner of the remote database. DOMAIN\useradmin is assigned the roles, System Administrator, System User and Browser, Content Manager, My Reports, Publisher, Report Builder. So if everything is being run under an über AD account, why I am getting this Could not obtain information about Windows NT group/user 'DOMAIN\useradmin' error? Under normal circumstances , an AD login with Publisher permissions will developing reports using a datasource model created by DOMAIN\useradmin but using one of the remote database’s users which is mapped from yet another AD login. I ran the following statements and non errors were returned: use master go xp_grantlogin 'DOMAIN\useradmin' go xp_logininfo 'DOMAIN\useradmin' go

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• Natural language grammar and user-entered names

  - by Owen Blacker

  Some languages, particularly Slavic languages, change the endings of people's names according to the grammatical context. (For those of you who know grammar or studied languages that do this to words, such as German or Russian, and to help with search keywords, I'm talking about noun declension.) This is probably easiest with a set of examples (in Polish, to save the whole different-alphabet problem): Dorothy saw the cat — Dorota zobaczyla kota The cat saw Dorothy — Kot zobaczyl Dorote It is Dorothy’s cat — To jest kot Doroty I gave the cat to Dorothy — Dalam kota Dorotie I went for a walk with Dorothy — Poszlam na spacer z Dorota “Hello, Dorothy!” — “Witam, Doroto!” Now, if, in these examples, the name here were to be user-entered, that introduces a world of grammar nightmares. Importantly, if I went for Katie (Kasia), the examples are not directly comparable — 3 and 4 are both Kasi, rather than *Kasy and *Kasie — and male names will be wholly different again. I'm guessing someone has dealt with this situation before, but my Google-fu appears to be weak today. I can find a lot of links about natural-language processing, but I don'think that's quite what I want. To be clear: I'm only ever gonna have one user-entered name per user and I'm gonna need to decline them into known configurations — I'll have a localised text that will have placeholders something like {name nominative} and {name dative}, for the sake of argument. I really don't want to have to do lexical analysis of text to work stuff out, I'll only ever need to decline that one user-entered name. Anyone have any recommendations on how to do this, or do I need to start calling round localisation agencies ;o) Further reading (all on Wikipedia) for the interested: Declension Grammatical case Declension in Polish Declension in Russian Declension in Czech nouns and pronouns Disclaimer: I know this happens in many other languages; highlighting Slavic languages is merely because I have a project that is going to be localised into some Slavic languages.

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• Using java2d user space measurements with TextLayout and LineBreakMeasurer

  - by Andrew Wheeler

  I have a java2d image defined in user space (mm) to print an identity card. The transformation to pixels is by using an AffineTransform for the required DPI (Screen or print). I want to wrap text across several lines but the the TextLayout does not respect user space co-ordinates. private void drawParagraph(Graphics2D g2d, Rectangle2D area, String text) { LineBreakMeasurer lineMeasurer; AttributedString string = new AttributedString(text); AttributedCharacterIterator paragraph = string.getIterator(); int paragraphStart = paragraph.getBeginIndex(); int paragraphEnd = paragraph.getEndIndex(); FontRenderContext frc = g2d.getFontRenderContext(); lineMeasurer = new LineBreakMeasurer(paragraph, frc); float breakWidth = (float)area.getWidth(); float drawPosY = (float)area.getY(); float drawPosX = (float)area.getX(); lineMeasurer.setPosition(paragraphStart); while (lineMeasurer.getPosition() < paragraphEnd) { TextLayout layout = lineMeasurer.nextLayout(breakWidth); drawPosY += layout.getAscent(); layout.draw(g2d, drawPosX, drawPosY); drawPosY += layout.getDescent() + layout.getLeading(); } } The above code determines font metrics using user space sizing of the Font and thus turn out rather large. The font size is calculated as best vertical fit for the number of lines in an area with the calculation as below. E.g. attr.put(TextAttribute.SIZE, (geTextArea().getHeight() / noOfLines - LINE_SPACING) ); When using g2d.drawString("Some text to display", x, y); the font size appears correct. Does anyone have a better way of doing text layout in user space co-ords?

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• Calculating bounding grid coordinates to a user click on google maps/google earth

  - by user170304

  Hello, I have a requirement to calculate the centroid or geodesic midpoint of when a user clicks in between the lat/long grid crossing. The crossing forms a square in most parts of GE and sometimes elongated rectangles. This is due to the shape of the earth of course. I'm looking for a valid mathematical formula that would allow a user to click anywhere in between this grid and then an accurate function (in Javascript or server side code) that would take an assumed grid resolution (say 1km intervals for this discussion) and the input coordinates that should return a centroid coordinate within that graticule grid. To clarify please take a look at the attached image to my google group post: http://google-earth-api.googlegroups.com/web/Picture+5.png?gda=h5oFPz8AAAD315KpovipQeBwdfGpmW3ZhBc9PTADwYa-n193hZ6AItFmHuno63c7phcEXYVuRA6ccyFKn-rNKC-d1pM%5FIdV0&gsc=sz6bbAsAAABBKF7YXWYyc4GmXg-QruHj What I need to be able to do is if a user clicks anywhere in this grid square, I need to find the centroid or center point of that grid intersection/square or at least the bounding grid coordinates (that make the square). If we assume that the grid is UTM standard and has a max resolution of 1km (or make this a parameter), I need to detect the four other points nearby and then calculating the centroid is not as difficult. I welcome any feedback you all may have and appreciate it. I don't have a simple way of letting a user click anywhere on the grid and finding the grid bounding coordinates (making a square of 4 coordinates) or the centroid / midpoint of the graticule grid square necessary. One thought is to use assumptions as much as possible using a reference such as UTM coordinate reference. If I assume that the grid is X degrees wide, can we have a pure javascript function take any input coordinate and return for me the bounding graticule coordinates in Decimal Degrees? Another thought I had was to create the grid in a geo-spatial layer to take any input coordinate and return the nearest centroid of the graticule? Does this make sense? Thanks! Omar

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• Rails user authorization

  - by Zachary

  I am currently building a Rails app, and trying to figure out the best way to authenticate that a user owns whatever data object they are trying to edit. I already have an authentication system in place (restful-authentication), and I'm using a simple before_filter to make sure a user is logged in before they can reach certain areas of the website. However, I'm not sure the best way to handle a user trying to edit a specific piece of data - for example lets say users on my site can own Books, and they can edit the properties of the book (title, author, pages, etc), but they should only be able to do this for Books that -they- own. In my 'edit' method on the books controller I would have a find that only retrieved books owned by the current_user. However, if another user knew the id of the book, they could type in http://website.com/book/7/edit , and the controller would verify that they are logged in, then show the edit page for that book (seems to bypass the controller). What is the best way to handle this? Is it more of a Rails convention routing issue that I don't understand (being able to go straight to the edit page), or should I be adding in a before_find, before_save, before_update, etc callbacks to my model?

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• How to setup a Zend_Application with an application.ini and a user.ini

  - by Peter Smit

  I am using Zend_Application and it does not feel right that I am mixing in my application.ini both application and user configuration. What I mean with this is the following. For example, my application needs some library classes in the namespace MyApp_ . So in application.ini I put autoloaderNamespaces[] = "MyApp_". This is pure application configuration, no-one except a programmer would change these. On the other hand I put there a database configuration, something that a SysAdmin would change. My idea is that I would split options between an application.ini and an user.ini, where the options in user.ini take preference (so I can define standard values in application.ini). Is this a good idea? How can I best implement this? The idea's I have are Extending Zend_Application to take multiple config files Making an init function in my Bootstrap loading the user.ini Parsing the config files in my index.php and pass these to Zend_Application (sounds ugly) What shall I do? I would like to have the 'cleanest' solution, which is prepared for the future (newer ZF versions, and other developers working on the same app)

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• Editing a User's Likes on Facebook

  - by Ed Marty

  I've been looking at the Facebook API to find some way to edit a user's Likes (that is, add or remove items from https://graph.facebook.com/me/likes/). The API doesn't say anything about it specifically, but does say this: You can publish to the Facebook graph by issuing HTTP POST requests to the appropriate connection URLs above. Where above, one of the connection URLs is the aforementioned https://graph.facebook.com/me/likes link. However, there's no documentation for the PROFILE_ID/likes post, and whenever I try to post it returns the error "invalid post_id". I assume this is because to like something, you post a request to POST_ID/likes. It's a bit inconsistent. What I'm trying to do is get the user's profile to add a Page to their likes (by posting using the page's id as an "id" parameter in the post body). However, it seems like there's just no way to edit user's likes. At the end of the day, I just want to allow a user to click a button in my application (mobile device application, not a web app) and have them add our Facebook page into their list of pages, and I've found no way of doing that short of presenting our page to them and making them click on the "Like" button manually. Many other things are supported without showing the Facebook website, like posting to their wall or making albums, but I can't find anything to do this. Any ideas?

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• Unknown user 'app' with capistrano

  - by trobrock

  This is my first time trying to set up capistrano to deploy a rails application. I am deploying from my local machine to my remote server that has the repo, web, app, and mysql servers all on the same machine. I am following this walk through: http://www.capify.org/index.php/From_The_Beginning I get to the command cap deploy:start Then I get this error: *** [err :: example.com] sudo: unknown user: app command finished failed: "sh -c 'cd /var/www/example/current && sudo -p '\\''sudo password: '\\'' -u app nohup script/spin'" on example.com Am I supposed to add an 'app' user, or is there a way of changing what user the command runs as? This is my deploy.rb: set :application, "example" set :repository, "[email protected]:example.git" set :user, "trobrock" set :branch, 'master' set :deploy_to, "/var/www/example" set :scm, :git # Or: `accurev`, `bzr`, `cvs`, `darcs`, `git`, `mercurial`, `perforce`, `subversion` or `none` role :web, "example.com" # Your HTTP server, Apache/etc role :app, "example.com" # This may be the same as your `Web` server role :db, "example.com", :primary => true # This is where Rails migrations will run And obviously everywhere it says example.com is my servers hostname and every it just says example is the app name.

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• Java - encrypt / decrypt user name and password from a configuration file

  - by nzpcmad

  We are busy developing a Java web service for a client. There are two possible choices: Store the encrypted user name / password on the web service client. Read from a config. file on the client side, decrypt and send. Store the encrypted user name / password on the web server. Read from a config. file on the web server, decrypt and use in the web service. The user name / password is used by the web service to access a third-party application. The client already has classes that provide this functionality but this approach involves sending the user name / password in the clear (albeit within the intranet). They would prefer storing the info. within the web service but don't really want to pay for something they already have. (Security is not a big consideration because it's only within their intranet). So we need something quick and easy in Java. Any recommendations? The server is Tomkat 5.5. The web service is Axis2. What encrypt / decrypt package should we use? What about a key store? What configuration mechanism should we use? Will this be easy to deploy?

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• Understanding F# Asynchronous Programming

  - by Yin Zhu

  I kind of know the syntax of asynchronous programming in F#. E.g. let downloadUrl(url:string) = async { let req = HttpWebRequest.Create(url) // Run operation asynchronously let! resp = req.AsyncGetResponse() let stream = resp.GetResponseStream() // Dispose 'StreamReader' when completed use reader = new StreamReader(stream) // Run asynchronously and then return the result return! reader.AsyncReadToEnd() } In F# expert book (and many other sources), they say like let! var = expr simply means "perform the asynchronous operation expr and bind the result to var when the operation completes. Then continue by executing the rest of the computation body" I also know that a new thread is created when performing async operation. My original understanding was that there are two parallel threads after the async operation, one doing I/O and one continuing to execute the async body at the same time. But in this example, I am confused at let! resp = req.AsyncGetResponse() let stream = resp.GetResponseStream() What happens if resp has not started yet and the thread in the async body wants to GetResponseStream? Is this a possible error? So maybe my original understanding was wrong. The quoted sentences in the F# expert book actually means that "creating a new thread, hang the current thread up, when the new thread finishes, wake up the body thread and continue", but in this case I don't see we could save any time. In the original understanding, the time is saved when there are several independent IO operations in one async block so that they could be done at the same time without intervention with each other. But here, if I don't get the response, I cannot create the stream; only I have stream, I can start reading the stream. Where's the time gained?

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• Adaptive user interface/environment algorithm

  - by WowtaH

  Hi all, I'm working on an information system (in C#) that (while my users use it) gathers statistical data on what pieces of information (tables & records) each user is requesting the most, and what parts of the interface he/she uses most. I'm using this statistical data to make the application adaptive to the user's needs, both in the way the interface presents itself (eg: tab/pane-ordering) as in the way of using the frequently viewed information to (eg:) show higher in search results/suggestion-lists. What i'm looking for is an algorithm/formula to determine the current 'hotness'/relevance of these objects for a specific user. A simple 'hitcounter' for each object won't be sufficient because the user might view some information quite frequently for a period of time, and then moving on to the next, making the old information less relevant. So i think my algorithm also needs some sort of sliding/historical principle to account for the changing popularity of the objects in the application over time. So, the question is: Does anybody have some sort of algorithm that accounts for that 'popularity over time' ? Preferably with some explanation on the parameters :) Thanks! PS I've looked at other posts like http://stackoverflow.com/questions/32397/popularity-algorithm but i could't quite port it to my specific case. Any help is appreciated.

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• Pronunciation of programming structures (particularly in c#)

  - by Andrzej Nosal

  As a non-English speaking person I often have problems pronouncing certain programming structures and abbreviations. I've been watching some video tutorials and listening to podcasts as well, though I couldn't catch them all. My question is what is the common or correct pronunciation of the following code snippets? Generics, like IEnumerable<int> or in a method void Swap<T>(T lhs, T rhs) Collections indexing and indexer access e.g. garage[i], rectangular arrays myArray[2,1] or jagged[1][2][3] Lambda operator =>, e.g. in a where extension method .Where(animal => animal.Color == Color.Brown) or in an anonymous method () => { return false;} Inheritance class Derived : Base (extends?) class SomeClass : IDisposable (implements?) Arithemtic operators += -= *= /= %= ! Are += and -= pronounced the same for events? Collections initializers new int[] { 4, 5, 8, 9, 12, 13, 16, 17 }; Casting MyEnum foo = (MyEnum)(int)yourFloat; (as?) Nullables DateTime? dt = new DateTime?(); I tagged the question with C# as some of them are specific to C# only.

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• Detecting whether user stayed after prompting onBeforeUnload

  - by Daniel Magliola

  In a web app I'm working on, I'm capturing onBeforeUnload to ask the user whether he really wants to exit. Now, if he decides to stay, there are a number of things I'd like to do. What I'm trying to figure out is that he actually chose to stay. I can of course declare a SetTimeout for "x" seconds, and if that fires, then it would mean the user is still there (because we didn't get unloaded). The problem is that the user can take any time to decide whether to stay or not... I was first hoping that while the dialog was showing, SetTimeout calls would not fire, so I could set a timeout for a short time and it'd only fire if the user chose to stay. However, timeouts do fire while the dialog is shown, so that doesn't work. Another idea I tried is capturing mouseMoves on the window/document. While the dialog is shown, mouseMoves indeed don't fire, except for one weird exception that really applies to my case, so that won't work either. Can anyone think of other way to do this? Thanks! (In case you're curious, the reason capturing mouseMove doesn't work is that I have an IFrame in my page, containing a site from another domain. If at the time of unloading the page, the focus is within the IFrame, while the dialog shows, then I get the MouseMove event firing ONCE when the mouse moves from inside the IFrame to the outside (at least in Firefox). That's probably a bug, but still, it's very likely that'll happen in our case, so I can't use this method).

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• suggestions for declarative GUI programming in Java

  - by Jason S

  I wonder if there are any suggestions for declarative GUI programming in Java. (I abhor visual-based GUI creator/editor software, but am getting a little tired of manually instantiating JPanels and Boxes and JLabels and JLists etc.) That's my overall question, but I have two specific questions for approaches I'm thinking of taking: JavaFX: is there an example somewhere of a realistic GUI display (e.g. not circles and rectangles, but listboxes and buttons and labels and the like) in JavaFX, which can interface with a Java sourcefile that accesses and updates various elements? Plain Old Swing with something to parse XUL-ish XML: has anyone invented a declarative syntax (like XUL) for XML for use with Java Swing? I suppose it wouldn't be hard to do, to create some code based on STaX which reads an XML file, instantiates a hierarchy of Swing elements, and makes the hierarchy accessible through some kind of object model. But I'd rather use something that's well-known and documented and tested than to try to invent such a thing myself. JGoodies Forms -- not exactly declarative, but kinda close & I've had good luck with JGoodies Binding. But their syntax for Form Layout seems kinda cryptic. edit: lots of great answers here! (& I added #3 above) I'd be especially grateful for hearing any experiences any of you have had with using one of these frameworks for real-world applications. p.s. I did try a few google searches ("java gui declarative"), just didn't quite know what to look for.

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• Facebook graph API post to user's wall

  - by Lance

  I'm using the FB graph api to post content to the user's wall. I orginally tried using this method: $wall_post = array(array('message' => 'predicted the', 'name' => 'predicted the'), array('message' => $winning_team, 'name' => $winning_team, 'link' => 'http://www.sportannica.com/teams.php?team='.$winning_team.'&amp;year=2012'), array('message' => 'to beat the', 'name' => 'to beat the',), array('message' => $losing_team, 'name' => $losing_team, 'link' => 'http://www.sportannica.com/teams.php?team='.$losing_team.'&amp;year=2012'), array('message' => 'on '.$game_date.'', 'name' => 'on '.$game_date.''), array('picture' => 'http://www.sportannica.com/img/team_icons/current_season_logos/large/'.$winning_team.'.png')); $res = $facebook->api('/me/feed/', 'post', '$wall_post'); But, much to my surprise, you can't post multiple links to a users wall. So, now I'm using the graph api to post content to a user's wall much like the way spotify does. So, now I've figured out that I need to create custom actions and objects with the open graph dashboard. So, I've created the "predict" action and gave it permission to edit the object "game." So, now I have the code: $facebook = new Facebook(array( 'appId' => 'appID', 'secret' => 'SECRET', 'cookie' => true )); $access_token = $facebook->getAccessToken(); $user = $facebook->getUser(); if($user != 0) { curl -F 'access_token='$.access_token.'' \ -F 'away_team=New York Yankees' \ -F 'home_team=New York Mets' \ -F 'match=http://samples.ogp.me/413385652011237' \ 'https://graph.facebook.com/me/predict-edit-add:predict' } I keep getting an error reading: Parse error: syntax error, unexpected T_CONSTANT_ENCAPSED_STRING Any ideas?

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• Implementing Excel 2003 COM Add-in UDF in Asyc Programming model using C#(VS 2005)

  - by Venu

  Hi: I am trying to implement a UDF using Excel COM Add-in(2003) with Visual Studio 2005 in C#. I would like to implement the UDF using async programming. The UDF is a slow operation as its results are fetched from a server. As an illustration(not a real world example),the following UDF works fine without any issue: public double mul(double number1, double number2) { return number1 * number2; } How can I do the same functionality in an async way: For example, I would like the UDF return immediately and later when the results are available from a server, I would like to update the desired cells. // This method returns immediately. public object mul(double number1, double number2) { return "calculating"; } // This method of a worker thread will update the results. public OnResultsAvailable(object result) { // Question: how should I update the cells that triggerred the calcualtions above? } Constraints: I cannot use Excel RTD as I have to work with existing codebase written using Excel C# COM Add-in. Thanks for the help. -Venu

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