say - Page 620 - Developer IT

Knowing the selections made on a 'multichooser' box in a mechanical turk hit (using Command Line Too

- by gveda

Hi All, I am new to Amazon Mechanical Turk, and wanted to create a hit with a qualification task. I am using the command line tools interface. One of the questions in my qualification task involves users selecting a number of options. I use a 'multichooser' selection type. Now I want to grade the responses based on the selections, where each selection has a different score. So for example, s1 has a score of 5, s2 of 10, s3 of 6, and so on. If the user selects s1 and s3, he/she gets a score of 11. Unfortunately, doing something like the following does not work: <AnswerOption> <SelectionIdentifier>s1</SelectionIdentifier> <AnswerScore>5</AnswerScore> </AnswerOption> <AnswerOption> <SelectionIdentifier>s2</SelectionIdentifier> <AnswerScore>10</AnswerScore> </AnswerOption> <AnswerOption> <SelectionIdentifier>s3</SelectionIdentifier> <AnswerScore>6</AnswerScore> </AnswerOption> If I do this, when I select multiple things, I get a score of 0. If I select only one option, say s1, then I get the appropriate score. Can you please help me on how to go about this? I could ask the same question 5 times with the same options, but then users might choose the same answer multiple times - something I wish to avoid. Thanks! Gaurav

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WPF - Setting ComboBox.SelectedItem in XAML based on matching object

- by Andy T

Hi, so, I have templated combobox that is basically acting as a simple colour palette. It is populated with a list of SolidColorBrush objects. Fine. Now, I have some data that holds the hex value of the current colour. I have a converter that converts the hex into a SolidColorBrush. Also fine. Now, I want to set the SelectedItem property of the combobox based on the colour from my datasource. Since my combo is populated with objects of type SolidColourBrush, and my binding converter is returning a SolidColorBrush, I assumed it would be as simple as saying: SelectedItem="{Binding Color, Converter={StaticResource StringToBrush}}" However... it doesn't work :( I've tested that the binding is working behind the scenes by using the exact same value for the Background property of the combobox. It works fine. So, clearly I can't just say SelectedItem = [something] where that [something] is basically an object equal to the item I want to be selected. What is the right way to do this? Surely it's possible in a XAML-only styley using binding, and I don't have to do some nasty C# iterating through all items in the combobox trying to find a match (that seems awfully old-school)...? Any help appreciated. Many thanks! AT

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jquery select elements between two elements that are not siblings

- by naugtur

eg. [I've removed attributes, but it's a bit of auto-generated html] <img class="p"/> <div> hello world <p> <font><font size="2">text.<img class="p"/> some text</font></font> </p> <img class="p"/> <p> <font><font size="2">more text<img class="p"/> another piece of text </font></font> </p><img class="p"/> some text on the end </div> I need to apply some highlighting with backgrounds to all text that is between two closest [in the html code] img.p elements when hovering first of them. I have no idea how to do that. Lets say I hover the first img.p - it should highlight hello world and text. and nothing else. And now the worst part - I need the backgrounds to disappear on mouseleave. I need it to work with any HTML mess possible. The above is just an example and structure of the documents will differ. [tip. Processing the whole html before binding hover and putting some spans etc. is ok as long as it doesn't change the looks of the output document]

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NSString's stringByAppendingPathComponent: removes a '/' in http://

- by Jasarien

I've been modifying some code to work between Mac OS X and iPhone OS. I came across some code that was using NSURL's URLByAppendingPathComponent: (added in 10.6), which as some may know, isn't available in the iPhone SDK. My solution to make this code work between OS's is to use NSString *urlString = [myURL absoluteString]; urlString = [urlString stringByAppendingPathComponent:@"helloworld"]; myURL = [NSURL urlWithString:urlString]; The problem with this is that NSString's stringByAppendingPathComponent: seems to remove one of the /'s from the http:// part of the URL. Is this intended behaviour or a bug? Edit Ok, So I was a bit too quick in asking the question above. I re-read the documentation and it does say: Note that this method only works with file paths (not, for example, string representations of URLs) However, it doesn't give any pointers in the right direction for what to do if you need to append a path component to a URL on the iPhone... I could always just do it manually, adding a /if necessary and the extra string, but I was looking to keep it as close to the original Mac OS X code as possible...

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Comparing RPG to C# and SQL.

- by Kevin

In an RPG program (One of IBM's languages on the AS/400) I can "chain" out to a file to see if a record (say, a certain customer record) exists in the file. If it does, then I can update that record instantly with new data. If the record doesn't exist, I can write a new record. The code would look like this: Customer Chain CustFile 71 ;turn on indicator 71 if not found if *in71 ;if 71 is "on" eval CustID = Customer; eval CustCredit = 10000; write CustRecord else ;71 not on, record found. CustCredit = 10000; update CustRecord endif Not being real familiar with SQL/C#, I'm wondering if there is a way to do a random retrieval from a file (which is what "chain" does in RPG). Basically I want to see if a record exists. If it does, update the record with some new information. If it does not, then I want to write a new record. I'm sure it's possible, but not quite sure how to go about doing it. Any advice would be greatly appreciated.

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Cucumber Error: Socket Error for Test Environment Host in REST API

- by tmo256

I posted this to the Cucumber group with no replies, which makes me wonder if this is actually a cucumber issue or not. I'm pretty new to cucumber, and there are a number of things I really don't quite understand about how the cucumber environment is set up and executed within the test environment. I have a REST API rails app I'm testing with cucumber, using the RestClient gem to generate a post to controller create action. When I run the feature with a hard-coded URL pointing to a running localhost server (my local dev server environment; replacing tickets_url with "http:// localhost/tickets" in the snippet below), my cucumber steps execute as expected. However, when the resource URL resolves to the cucumber host I'm declaring, I get a socket error exception. getaddrinfo: nodename nor servname provided, or not known (SocketError) From the steps file: When /^POS Adapter sends JSON data to the Tickets resource$/ do ticket = { :ticket = { ... } } host! "test.host" puts tickets_url RestClient.post tickets_url, ticket.to_json, :content_type = :json, :accepts = :json end (the "puts" statement prints "http://test.host/tickets") Using the following gems: cucumber-0.6.1 webrat-0.6.0 rest-client-1.2.0 I should also say I have a similar set up in another rails app, using test.host as my host, and it seems to work fine. I'd appreciate any insight on what I might be missing in my configuration or what this could be related to.

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Backing up my locally hosted rails apps in preparation for OS upgrade

- by stephen murdoch

I have some apps running on Heroku. I will be upgrading my OS in two weeks. The last time I upgraded though (6 months ago) I ran into some problems. Here's what I did: copied all my rails apps onto DVD upgraded OS transferred rails apps from DVD to new OS Then, after setting up new SSH-keys I tried to push to some of my heroku apps and, whilst I can't remember the exact error message off-hand, it more or less amounted to "fatal exception the remote end hung up" So I know that I'm doing something wrong here. First of all, is there any need for me to be putting my heroku hosted rails apps onto DVD? Would I be better just pulling all my apps from their heroku repos once I've done the upgrade? What do others do here? The reason I stuck them on DVD is because I tend to push a specific production branch to Heroku and sometimes omit large development files from it... Secondly, was this problem caused by SSH keys? Should I have backed up the old keys and transferred them from my old OS to my new one too, or is Heroku perfectly happy to let you change OS's like that? My solution in the end was to just create new heroku apps and reassign the custom domain names in heroku add-ons menu... I never actually though of pulling from the heroku repos as I tend to push a specific branch to heroku and that branch doesn't always have all the development files in it... I realise that the error message I mentioned doesn't particularly help anyone but I didn't think to remember it 6 months ago. Any advice would be appreciated PS - when I say upgrade, I mean full install of the new version with full format of the HDD.

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Get ID in GridView

- by Romil

Hi, I have One grid say Grid 1 in which there are some columns. There is one view image button, one delete image button and one column which says that color column is Red or Blue. If color column is Red the deleted button is hidden else its shown (Based on user given rights to delete a column or not). Now a user clicks a view button for Red Color Column. If this condition is satisfied, then i want that delete icon should not be present in Grid 2. Grid 2 has 2 columns. One is deleted image button and one is file name (which is uploaded via upload control). So If in Grid One "View Image Button" is clicked for "Red" Column i should be able to hide the delete button from Grid 2. I have tried by writing code in Item command but i am not able to access control of grid2. is this the correct way? Or else suggest me some correct way. Please Make sure that code is compatible with VS 2003. let me know if more inputs are needed. Thanks

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Rails: Create method available in all views and all models

- by smotchkkiss

I'd like to define a method that is available in both my views and my models Say I have a view helper: def foo(s) "hello #{s}" end A view might use the helper like this: <div class="data"><%= foo(@user.name) %></div> However, this <div> will be updated with a repeating ajax call. I'm using a to_json call in a controller returns data like so: render :text => @item.to_json(:only => [...], :methods => [:foo]) This means, that I have to have foo defined in my Item model as well: class Item def foo "hello #{name}" end end It'd be nice if I could have a DRY method that could be shared in both my views and my models. Usage might look like this: Helper def say_hello(s) "hello #{s}" end User.rb model def foo say_hello(name) end Item.rb model def foo say_hello(label) end View <div class="data"><%= item.foo %></div> Controller def observe @items = item.find(...) render :text => @items.to_json(:only=>[...], :methods=>[:foo]) end IF I'M DUMB, please let me know. I don't know the best way to handle this, but I don't want to completely go against best-practices here. If you can think of a better way, I'm eager to learn!

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Functional way to get a matrix from text

- by Elazar Leibovich

I'm trying to solve some Google Code Jam problems, where an input matrix is typically given in this form: 2 3 #matrix dimensions 1 2 3 4 5 6 7 8 9 # all 3 elements in the first row 2 3 4 5 6 7 8 9 0 # each element is composed of three integers where each element of the matrix is composed of, say, three integers. So this example should be converted to #!scala Array( Array(A(1,2,3),A(4,5,6),A(7,8,9), Array(A(2,3,4),A(5,6,7),A(8,9,0), ) An imperative solution would be of the form #!python input = """2 3 1 2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9 0 """ lines = input.split('\n') print lines[0] m,n = (int(x) for x in lines[0].split()) array = [] row = [] A = [] for line in lines[1:]: for elt in line.split(): A.append(elt) if len(A)== 3: row.append(A) A = [] array.append(row) row = [] from pprint import pprint pprint(array) A functional solution I've thought of is #!scala def splitList[A](l:List[A],i:Int):List[List[A]] = { if (l.isEmpty) return List[List[A]]() val (head,tail) = l.splitAt(i) return head :: splitList(tail,i) } def readMatrix(src:Iterator[String]):Array[Array[TrafficLight]] = { val Array(x,y) = src.next.split(" +").map(_.trim.toInt) val mat = src.take(x).toList.map(_.split(" "). map(_.trim.toInt)). map(a => splitList(a.toList,3). map(b => TrafficLight(b(0),b(1),b(2)) ).toArray ).toArray return mat } But I really feel it's the wrong way to go because: I'm using the functional List structure for each line, and then convert it to an array. The whole code seems much less efficeint I find it longer less elegant and much less readable than the python solution. It is harder to which of the map functions operates on what, as they all use the same semantics. What is the right functional way to do that?

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Check if the internet cannot be accessed in Python

- by Sridhar Ratnakumar

I have an app that makes a HTTP GET request to a particular URL on the internet. But when the network is down (say, no public wifi - or my ISP is down, or some such thing), I get the following traceback at urllib.urlopen: 70, in get u = urllib2.urlopen(req) File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/urllib2.py", line 126, in urlopen return _opener.open(url, data, timeout) File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/urllib2.py", line 391, in open response = self._open(req, data) File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/urllib2.py", line 409, in _open '_open', req) File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/urllib2.py", line 369, in _call_chain result = func(*args) File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/urllib2.py", line 1161, in http_open return self.do_open(httplib.HTTPConnection, req) File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/urllib2.py", line 1136, in do_open raise URLError(err) URLError: <urlopen error [Errno 8] nodename nor servname provided, or not known> I want to print a friendly error to the user telling him that his network maybe down instead of this unfriendly "nodename nor servname provided" error message. Sure I can catch URLError, but that would catch every url error, not just the one related to network downtime. I am not a purist, so even an error message like "The server example.com cannot be reached; either the server is indeed having problems or your network connection is down" would be nice. How do I go about selectively catching such errors? (For a start, if DNS resolution fails at urllib.urlopen, that can be reasonably assumed as network inaccessibility? If so, how do I "catch" it in the except block?)

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Automatically release resources RAII-style in Perl

- by Philip Potter

Say I have a resource (e.g. a filehandle or network socket) which has to be freed: open my $fh, "<", "filename" or die "Couldn't open filename: $!"; process($fh); close $fh or die "Couldn't close filename: $!"; Suppose that process might die. Then the code block exits early, and $fh doesn't get closed. I could explicitly check for errors: open my $fh, "<", "filename" or die "Couldn't open filename: $!"; eval {process($fh)}; my $saved_error = $@; close $fh or die "Couldn't close filename: $!"; die $saved_error if $saved_error; but this kind of code is notoriously difficult to get right, and only gets more complicated when you add more resources. In C++ I would use RAII to create an object which owns the resource, and whose destructor would free it. That way, I don't have to remember to free the resource, and resource cleanup happens correctly as soon as the RAII object goes out of scope - even if an exception is thrown. Unfortunately in Perl a DESTROY method is unsuitable for this purpose as there are no guarantees for when it will be called. Is there a Perlish way to ensure resources are automatically freed like this even in the presence of exceptions? Or is explicit error checking the only option?

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How to write C++ audio processing applications?

- by cesko82

Hi everyone, I'm an Electronics and Telecommunications student, next to my graduation. I'm gonna work on a project that involves my knowledge about DSP, music and audio in general. I allready know all the basic mathematic instruments and all the stuff I need to manage it, such as FFT, circular convolution ecc ecc. I want to learn C++ programming basically for one reason: it's very important in the professional world!!! And I think it's one of the most used to write applications working with audio, especially when it's about real time processing. Ok, after this small introduction I would like to know first, which are the most used libraries to work with audio processing in c++?? I was longer looking on the web but i couldn't find a lo of working stuff. (I work under linux with eclipse CDT enviroment). Then I would like to know if there are good sources to learn how to write some working code, such as for example how to write a simple low pass filter. Basically now i will not write real time applications, I would like to start from the processing of a WAV file, or even better an MP3 file, so basically on vectors of samples. Let's say that basically for now I would like to extract the waveform from an audio file, and save it to a thumbnail or to a PNG image. Ok, for now I think it's all I would need. Any ideas, advices, libraries, books, interesting sources about that? Thanks a lot in advance for any kind of answer. Giovanni.

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Javascript scope chain

- by Geromey

Hi, I am trying to optimize my program. I think I understand the basics of closure. I am confused about the scope chain though. I know that in general you want a low scope (to access variables quickly). Say I have the following object: var my_object = (function(){ //private variables var a_private = 0; return{ //public //public variables a_public : 1, //public methods some_public : function(){ debugger; alert(this.a_public); alert(a_private); }; }; })(); My understanding is that if I am in the some_public method I can access the private variables faster than the public ones. Is this correct? My confusion comes with the scope level of this. When the code is stopped at debugger, firebug shows the public variable inside the this keyword. The this word is not inside a scope level. How fast is accessing this? Right now I am storing any this.properties as another local variable to avoid accessing it multiple times. Thanks very much!

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Are lambda expressions/delegates in C# "pure", or can they be?

- by Bob

I recently asked about functional programs having no side effects, and learned what this means for making parallelized tasks trivial. Specifically, that "pure" functions make this trivial as they have no side effects. I've also recently been looking into LINQ and lambda expressions as I've run across examples many times here on StackOverflow involving enumeration. That got me to wondering if parallelizing an enumeration or loop can be "easier" in C# now. Are lambda expressions "pure" enough to pull off trivial parallelizing? Maybe it depends on what you're doing with the expression, but can they be pure enough? Would something like this be theoretically possible/trivial in C#?: Break the loop into chunks Run a thread to loop through each chunk Run a function that does something with the value from the current loop position of each thread For instance, say I had a bunch of objects in a game loop (as I am developing a game and was thinking about the possibility of multiple threads) and had to do something with each of them every frame, would the above be trivial to pull off? Looking at IEnumerable it seems it only keeps track of the current position, so I'm not sure I could use the normal generic collections to break the enumeration into "chunks". Sorry about this question. I used bullets above instead of pseudo-code because I don't even know enough to write pseudo-code off the top of my head. My .NET knowledge has been purely simple business stuff and I'm new to delegates and threads, etc. I mainly want to know if the above approach is good for pursuing, and if delegates/lambdas don't have to be worried about when it comes to their parallelization.

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Attributes of attributevalue element in SAML 2 Attribute Statement

- by AJ

I am building a web service that receives a SAML attribute query and responds with an attribute statement. I know I can return one or multiple values of a SAML attribute. I have some values that are dependent on the other attribute values. I need to show that relationship. Let us say, the query is for the Subject Dave and the return values are his company and job title. Dave can work at multiple companies with job title at each company. I have two options of sending this data back: Send this as a complextype by defining an attribute organization and return xml within that attribute. <saml:Attribute name="company"> <saml:AttributeValue> <company name="company1" jobtitle="CIO"/> <company name="company2" jobtitle="VP"/> </saml:AttributeValue> Try to send multiple values of attributes somehow sending a reference in attributevalue element. <saml:Attribute name="company"> <attributeValue>company1</attributeValue> <attributeValue>company2</attributeValue> </saml:Attribute> <saml:Attribute name="jobTitle> <attributeValue company="company1">CIO</attributeValue> <attributeValue company="company2">VP</attributeValue> </saml:Attribute> Which approach will you prefer? Why? I am biased towards second approach as it does not require client to know about any schema. It does require them to know about non-standard attribute company in the attribute value.

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Lua Operator Overloading

- by Pessimist

I've found some places on the web saying that operators in Lua are overloadable but I can't seem to find any example. Can someone provide an example of, say, overloading the + operator to work like the .. operator works for string concatenation? EDIT 1: to Alexander Gladysh and RBerteig: If operator overloading only works when both operands are the same type and changing this behavior wouldn't be easy, then how come the following code works? (I don't mean any offense, I just started learning this language): printf = function(fmt, ...) io.write(string.format(fmt, ...)) end Set = {} Set.mt = {} -- metatable for sets function Set.new (t) local set = {} setmetatable(set, Set.mt) for _, l in ipairs(t) do set[l] = true end return set end function Set.union (a,b) -- THIS IS THE PART THAT MANAGES OPERATOR OVERLOADING WITH OPERANDS OF DIFFERENT TYPES -- if user built new set using: new_set = some_set + some_number if type(a) == "table" and type(b) == "number" then print("building set...") local mixedset = Set.new{} for k in pairs(a) do mixedset[k] = true end mixedset[b] = true return mixedset -- elseif user built new set using: new_set = some_number + some_set elseif type(b) == "table" and type(a) == "number" then print("building set...") local mixedset = Set.new{} for k in pairs(b) do mixedset[k] = true end mixedset[a] = true return mixedset end if getmetatable(a) ~= Set.mt or getmetatable(b) ~= Set.mt then error("attempt to 'add' a set with a non-set value that is also not a number", 2) end local res = Set.new{} for k in pairs(a) do res[k] = true end for k in pairs(b) do res[k] = true end return res end function Set.tostring (set) local s = "{" local sep = "" for e in pairs(set) do s = s .. sep .. e sep = ", " end return s .. "}" end function Set.print (s) print(Set.tostring(s)) end s1 = Set.new{10, 20, 30, 50} s2 = Set.new{30, 1} Set.mt.__add = Set.union -- now try to make a new set by unioning a set plus a number: s3 = s1 + 8 Set.print(s3) --> {1, 10, 20, 30, 50}

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Efficient cron job utilizing Zend_Mail_Storage_Imap.

- by fireeyedboy

I'm new to the IMAP protocol and Zend_Mail_Storage and I'm writing a small php script for a cron job that should regularly poll an IMAP account and check for new messages, and send an e-mail if new messages have arrived. As you can imagine, I want to only poll the IMAP account for relevant messages, and I only want to send a new e-mail if new messages have arrived since the last polled new message. So I thought of keeping track of the last message I polled with some unique identifier for a message. But I'm a bit uncertain about whether the methods I want to utilize for this do what I expect them to do though. So my questions are: Does the iterator position of Zend_Mail_Storage_Imap actually resemble some IMAP unique identifier for messages, or is it simply only and internal position of Zend_Mail_Storage_Abstract? For instance, if I tell it to seek() to message 5 (which I stored from an earlier session) will it indeed seek to the appropriate message on the IMAP server, even if for instance messages have been deleted since last session? Would keeping track of this latest polled message id in a file suffice for a cron job that, say, polls the account every 5 or 10 minutes? Or is this too naive, and should I be using a database for instance. Or is there maybe a much easier way to keep track of such state with Zend_Mail_Storage_Abstract? Also, do I need to poll every IMAP folder? Or is everything accumulated when I poll INBOX? If you could shed some light on any of these matters, I'ld appreciate it. Thanks in advance.

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Transitive SQL query on same table

- by MiKu

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Is it possible to search locally in jqGrid with treeGrid installed

- by Nehu

I am using jqGrid with treeGrid. I have added a filterToolbar. I would like to search locally instead of having a server call. The treegrid docs say that, "When we initialize the grid and the data is read, the datatype is automatically set to local." So, is it possible to implement local search with treeGrid. I tried the below configuration, but it is resulting in server calls. My Configuration is var grid = $("#grid").jqGrid({ treeGrid: true, treeGridModel: 'adjacency', ExpandColumn: 'businessAreaName', ExpandColClick : true, url:'agileProgramme/records.do', datatype: 'json', mtype: 'GET', colNames:['Id' , 'Business Area' , 'Investment' , 'Org' , 'Goal' ], colModel:[ /*00*/ {name:'agileProgrammeId',index:'agileProgrammeId', width:0, editable:false,hidden:true}, /*01*/ {name:'businessAreaName',index:'businessAreaName', width:160, editable:false}, /*02*/ {name:'programmeName',index:'programmeName', width:150, editable:false, classes:'link'}, /*03*/ {name:'org',index:'org', width:50, editable:false, classes:'orgHierarchy', sortable : false}, /*04*/ {name:'goal',index:'goal', width:70, editable:false} ], treeReader : { level_field: "level", parent_id_field: "parent", leaf_field: "leaf", expanded_field: "expanded" }, autowidth: true, height: 240, pager: '#pager', sortname: 'id', sortorder: "asc", toolbar:[true,"top"], caption:"TableGridDemo", emptyrecords: "Empty records", jsonReader : { root: "rows", page: "page", total: "total", records: "records", repeatitems: false, cell: "cell", id: "agileProgrammeId" } }); And to implement the search toolbar $('#grid').jqGrid('filterToolbar', {stringResult: true,searchOnEnter : true}); Would appreciate any help or any pointer on even if it is possible?

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RSS feed created with PHP only shows the title in the feed reader

- by James Simpson

I am using the following PHP code to generate the XML for an RSS feed, but it doesn't seem to be working correctly. No short description is displayed in the feed reader, all I see is the title of the article. Also, all of the articles say they were published at the same time. This is the first time I have tried to setup an RSS feed, so I'm sure I've made several stupid mistakes. $result = mysql_query("SELECT * FROM blog ORDER BY id DESC LIMIT 10"); $date = date(DATE_RFC822); header('Content-type: text/xml'); echo ("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"); echo ("<rss version=\"2.0\">\n"); echo ("<channel>\n"); echo ("<lastBuildDate>$date</lastBuildDate>\n"); echo ("<pubDate>$date</pubDate>\n"); echo ("<title>my website name</title>\n"); echo ("<description><![CDATA[the description]]></description>\n"); echo ("<link>http://my-domain.com</link>\n"); echo ("<language>en</language>\n"); $ch=100; while ($a = mysql_fetch_array($result)) { $headline = htmlentities(stripslashes($a['subject'])); $posturl = $a[perm_link]; $content = $a['post']; $date = date(DATE_RFC822, $a['posted']); echo ("<item>\n"); echo ("<title>$headline</title>\n"); echo ("<link>$posturl</link>\n"); echo ("<description><![CDATA[$content]]></description>\n"); echo ("<guid isPermaLink=\"true\">$posturl</guid>\n"); echo ("<pubDate>$date2</pubDate>\n"); echo ("</item>\n"); } echo ("</channel>\n"); echo ("</rss>\n");

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Policy file error while loading images form facebook

- by Fahim Akhter

Hi, I making a game leaderboard on facebook. I'm not using connect but working inside the canvas. When I try to load the images from facebook it gives me the following error. SecurityError: Error #2122: Security sandbox violation: Loader.content: http://test cannot access http://profile.ak.fbcdn.net/v22941/254/15/q652310588_2173.jpg A policy file is required, but the checkPolicyFile flag was not set when this media was loaded. Here is my loader code public var preLoader:Loader; preLoader=new Loader(); **update** Security.loadPolicyFile('http://api.facebook.com/crossdomain.xml'); Security.allowDomain('http://profile.ak.fbcdn.net'); Security.allowInsecureDomain('http://profile.ak.fbcdn.net'); **update-end** public function imageContainer(Imagewidth:Number,Imageheight:Number,url:String,path:String) { preLoader=new Loader(); Security.loadPolicyFile("http://api.facebook.com/crossdomain.xml"); var context:LoaderContext = new LoaderContext(); context.checkPolicyFile = true; context.applicationDomain = ApplicationDomain.currentDomain; preLoader.load(new URLRequest(path),context); Any Ideas? I am importing the right class though. UPDATE: I am loading the images from a different domain say , calling func http://fahim.com images are from http://profile.ak.fbcdn.net/v22941/254/15/q652310588_2173.jpg something ( I have made sure the pictures are static do not require a facebook login or anything , they are just user public profile pictures)

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How to use references, avoid header bloat, and delay initialization?

- by Kyle

I was browsing for an alternative to using so many shared_ptrs, and found an excellent reply in a comment section: Do you really need shared ownership? If you stop and think for a few minutes, I'm sure you can pinpoint one owner of the object, and a number of users of it, that will only ever use it during the owner's lifetime. So simply make it a local/member object of the owners, and pass references to those who need to use it. I would love to do this, but the problem becomes that the definition of the owning object now needs the owned object to be fully defined first. For example, say I have the following in FooManager.h: class Foo; class FooManager { shared_ptr<Foo> foo; shared_ptr<Foo> getFoo() { return foo; } }; Now, taking the advice above, FooManager.h becomes: #include "Foo.h" class FooManager { Foo foo; Foo& getFoo() { return foo; } }; I have two issues with this. First, FooManager.h is no longer lightweight. Every cpp file that includes it now needs to compile Foo.h as well. Second, I no longer get to choose when foo is initialized. It must be initialized simultaneously with FooManager. How do I get around these issues?

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How to make a hyperlink through GridView column value?

- by avirk

I want here that user can see the answer under the question by selecting its heading. The question should be a hyperlink to redirect me on the page Answer.aspx. I mean to say that when user take cursor over the How to do this? it should redirect the user to the desired page. How can I do that? here is the code <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource1" Width="100%" BorderStyle="None"> <Columns> <asp:BoundField DataField="QuestionHEAD" HeaderText="Question" SortExpression="QuestionHEAD" HeaderStyle-ForeColor="white" HeaderStyle-BackColor="Brown"/> <asp:BoundField DataField="Problem" HeaderText="Problem" SortExpression="Problem" HeaderStyle-ForeColor="white" HeaderStyle-BackColor="Brown" /> <asp:BoundField DataField="Forum" HeaderText="Forum" SortExpression="Forum" HeaderStyle-ForeColor="white" HeaderStyle-BackColor="Brown"/> <asp:BoundField DataField="Username" HeaderText="Asked By" SortExpression="Username" HeaderStyle-ForeColor="white" HeaderStyle-BackColor="Brown" /> </Columns> </asp:GridView> <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:connectionstring %>" SelectCommand="SELECT [QuestionHEAD], [Problem], [Forum], [Username] FROM [Question]"> </asp:SqlDataSource>

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Eclipse does not refresh project files in package explorer view

- by EugeneP

Today I see a strange behaviour of Eclipse 3.5.2 for the first time in 3 months. First, when I run a main function, it runs a previously compiled version. Let's say I press Ctrl+F11 in the window with an open java class and existing main function. Usually it rebuilds the class and runs a new version. Today even if there was a compile mistake, it would run fine. So I guess it does not recompile the class. Next, more strangely, if I intentionally make a mistake in the code and Eclipse underlines those lines in red, still the project Explorer does not mark them as containing errors. They remain of grey color if there were not any errors. First I did not know how to solve this problem. I tried to reopen the project, restart Eclipse and finally reboot the OS. After the tenth attempt, after rebooting, Eclipse said that all project's files are "OUT OF SYNC with the file system". When I pressed "Refresh" - F5 on a project's header name in Project Explorer it finally marked all the files with errors as containing errors and running the main function gave the desired result. An hour of my work passed and this happened again , with the other project. All the same. No marking of files as red, running no matter what old version of class with no compile errors. And since Eclipse does not tell that files are out of sync, simply pressing F5 on a project cannot help. What can you suggest?

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