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• Sentiment analysis with NLTK python for sentences using sample data or webservice?

  - by Ke

  I am embarking upon a NLP project for sentiment analysis. I have successfully installed NLTK for python (seems like a great piece of software for this). However,I am having trouble understanding how it can be used to accomplish my task. Here is my task: I start with one long piece of data (lets say several hundred tweets on the subject of the UK election from their webservice) I would like to break this up into sentences (or info no longer than 100 or so chars) (I guess i can just do this in python??) Then to search through all the sentences for specific instances within that sentence e.g. "David Cameron" Then I would like to check for positive/negative sentiment in each sentence and count them accordingly NB: I am not really worried too much about accuracy because my data sets are large and also not worried too much about sarcasm. Here are the troubles I am having: All the data sets I can find e.g. the corpus movie review data that comes with NLTK arent in webservice format. It looks like this has had some processing done already. As far as I can see the processing (by stanford) was done with WEKA. Is it not possible for NLTK to do all this on its own? Here all the data sets have already been organised into positive/negative already e.g. polarity dataset http://www.cs.cornell.edu/People/pabo/movie-review-data/ How is this done? (to organise the sentences by sentiment, is it definitely WEKA? or something else?) I am not sure I understand why WEKA and NLTK would be used together. Seems like they do much the same thing. If im processing the data with WEKA first to find sentiment why would I need NLTK? Is it possible to explain why this might be necessary? I have found a few scripts that get somewhat near this task, but all are using the same pre-processed data. Is it not possible to process this data myself to find sentiment in sentences rather than using the data samples given in the link? Any help is much appreciated and will save me much hair! Cheers Ke

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• OperationalError "unable to open database file" processing query results with SQLAlchemy and SQLite3

  - by Peter

  I'm running into this little problem that I hope is just a dumb user error. It looks like some sort of a size limit with a query to a SQLite database. I managed to reproduce the issue with an in-memory DB and a simple script shown below. I can make it work by either reducing the number of records in the DB; or by reducing the size of each record; or by dropping the order_by() call. I am using Python 2.5.5 and SQLAlchemy 0.6.0 in a Cygwin environment. Thanks! #!/usr/bin/python from sqlalchemy.orm import sessionmaker import sqlalchemy import sqlalchemy.orm class Person(object): def __init__(self, name): self.name = name engine = sqlalchemy.create_engine('sqlite:///:memory:') Session = sessionmaker(bind=engine) metadata = sqlalchemy.schema.MetaData(bind=engine) person_table = sqlalchemy.Table('person', metadata, sqlalchemy.Column('id', sqlalchemy.types.Integer, primary_key=True), sqlalchemy.Column('name', sqlalchemy.types.String)) metadata.create_all(engine) sqlalchemy.orm.mapper(Person, person_table) session = Session() session.add_all([Person("012345678901234567890123456789012") for i in range(5000)]) session.commit() persons = session.query(Person).order_by(Person.name).all() print "count =", len(persons) session.close() The all() call to the query result fails with the OperationalError exception: Traceback (most recent call last): File "./stress.py", line 27, in <module> persons = session.query(Person).order_by(Person.name).all() File "/usr/lib/python2.5/site-packages/sqlalchemy/orm/query.py", line 1343, in all return list(self) File "/usr/lib/python2.5/site-packages/sqlalchemy/orm/query.py", line 1451, in __iter__ return self._execute_and_instances(context) File "/usr/lib/python2.5/site-packages/sqlalchemy/orm/query.py", line 1456, in _execute_and_instances mapper=self._mapper_zero_or_none()) File "/usr/lib/python2.5/site-packages/sqlalchemy/orm/session.py", line 737, in execute clause, params or {}) File "/usr/lib/python2.5/site-packages/sqlalchemy/engine/base.py", line 1109, in execute return Connection.executors[c](self, object, multiparams, params) File "/usr/lib/python2.5/site-packages/sqlalchemy/engine/base.py", line 1186, in _execute_clauseelement return self.__execute_context(context) File "/usr/lib/python2.5/site-packages/sqlalchemy/engine/base.py", line 1215, in __execute_context context.parameters[0], context=context) File "/usr/lib/python2.5/site-packages/sqlalchemy/engine/base.py", line 1284, in _cursor_execute self._handle_dbapi_exception(e, statement, parameters, cursor, context) File "/usr/lib/python2.5/site-packages/sqlalchemy/engine/base.py", line 1282, in _cursor_execute self.dialect.do_execute(cursor, statement, parameters, context=context) File "/usr/lib/python2.5/site-packages/sqlalchemy/engine/default.py", line 277, in do_execute cursor.execute(statement, parameters) sqlalchemy.exc.OperationalError: (OperationalError) unable to open database file u'SELECT person.id AS person_id, person.name AS person_name \nFROM person ORDER BY person.name' ()

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• jQuery unbinding click event when maximum number of children are displayed

  - by RyanP13

  I have a personal details form that alows you to enter a certain number of dependants which is determined by the JSP application. The first dependant is visible and the user has the option to add dependants up to the maximum number. All other dependants are hidden by default and are displayed when a user clicks the 'Add another dependant button'. When the maximum number of dependants has been reached the button is greyed out and a message is generated via jQuery and displayed to tell the user exactly this. The issue i am having is when the maximum number of dependants has been reached the message is displayed but then the user can click the button to add more dependants and the message keeps on generating. I thought unbinding the click event would sort this but it seems to still be able to generate a second message. Here is the function i wrote to generate the message: // Dependant message function function maxDependMsg(msgElement) { // number of children can change per product, needs to be dynamic // count number of dependants in HTML var $dependLength = $("div.dependant").length; // add class maxAdd to grey out Button // create maximum dependants message and display, will not be created if JS turned off $(msgElement) .addClass("maxAdd") .after($('<p>') .addClass("maxMsg") .append("The selected web policy does not offer cover for more than " + $dependLength + " children, please contact our customer advisers if you wish discuss alternative policies available.")); } There is a hyperlink with a click event attached like so: $("a.add").click(function(){ // Show the next hidden table on clicking add child button $(this).closest('form').find('div.dependant:hidden:first').show(); // Get the number of hidden tables var $hiddenChildren = $('div.dependant:hidden').length; if ($hiddenChildren == 0) { // save visible state of system message $.cookies.set('cpqbMaxDependantMsg', 'visible'); // show system message that you can't add anymore dependants than what is on page maxDependMsg("a.add"); $(this).unbind("click"); } // set a cookie for the visible state of all child tables $('div.dependant').each(function(){ var $childCount = $(this).index('div.dependant'); if ($(this).is(':visible')) { $.cookies.set('cpqbTableStatus' + $childCount, 'visible'); } else { $.cookies.set('cpqbTableStatus' + $childCount, 'hidden'); } }); return false; }); All of the cookies code is for state saving when users are going back and forward through the process.

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• Server side Xforms form validation and integration into ASP.NET

  - by Nigel

  I have recently been investigating methods of creating web-based forms for an ASP.NET web application that can be edited and managed at runtime. For example an administrator might wish to add a new validation rule or a new set of fields. The holy grail would provide a means of specifying a form along with (potentially very complex) arbitrary validation rules, and allocation of data sources for each field. The specification would then be used to update the deployed form in the web application which would then validate submissions both on the client side and on the server side. My investigations led me to Xforms and a number of technologies that support it. One solution appears to be IBM Lotus Forms, but this requires a very large investment in terms of infrastructure, which makes it infeasible, although the forms designer may be useful as a stand-alone tool for creating the forms. I have also discounted browser plug-ins as the form must be publicly visible and cross-browser compliant. I have noticed that there are numerous javascript libraries that provide client side implementations given an Xforms schema. These would provide a partial solution but server side validation is still a requirement. Another option seems to involve the use of server side solutions such as the Java application Orbeon. Orbeon provides a tool for specifying the forms (although not as rich as Lotus Forms Designer), but the most interesting point is that it can translate an XForms schema into an XHTML form complete with validation. The fact that it is written in Java is not a big problem if it is possible to integrate with the existing ASP.NET application. So my question is whether anyone has done this before. It sounds like a problem that should have been solved but is inherently very complex. It seems possible to use an off-the-shelf tool to design the form and export it to an Xforms schema and xhtml form, and it seems possible to take that xforms schema and form and publish it using a client side library. What seems to be difficult is providing a means of validating the form submission on the server side and integrating the process nicely with .NET (although it seems the .NET community doesn't involve themselves with XForms; please correct me if I'm wrong on this count). I would be more than happy if a product provided something simple like a web service that could validate a submission against a schema. Maybe Orbeon does this but I'd be grateful if somebody in the know could point me in the right direction before I research it further. Many thanks.

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• Synchronized Enumerator in C#

  - by Dan Bryant

  I'm putting together a custom SynchronizedCollection<T> class so that I can have a synchronized Observable collection for my WPF application. The synchronization is provided via a ReaderWriterLockSlim, which, for the most part, has been easy to apply. The case I'm having trouble with is how to provide thread-safe enumeration of the collection. I've created a custom IEnumerator<T> nested class that looks like this: private class SynchronizedEnumerator : IEnumerator<T> { private SynchronizedCollection<T> _collection; private int _currentIndex; internal SynchronizedEnumerator(SynchronizedCollection<T> collection) { _collection = collection; _collection._lock.EnterReadLock(); _currentIndex = -1; } #region IEnumerator<T> Members public T Current { get; private set;} #endregion #region IDisposable Members public void Dispose() { var collection = _collection; if (collection != null) collection._lock.ExitReadLock(); _collection = null; } #endregion #region IEnumerator Members object System.Collections.IEnumerator.Current { get { return Current; } } public bool MoveNext() { var collection = _collection; if (collection == null) throw new ObjectDisposedException("SynchronizedEnumerator"); _currentIndex++; if (_currentIndex >= collection.Count) { Current = default(T); return false; } Current = collection[_currentIndex]; return true; } public void Reset() { if (_collection == null) throw new ObjectDisposedException("SynchronizedEnumerator"); _currentIndex = -1; Current = default(T); } #endregion } My concern, however, is that if the Enumerator is not Disposed, the lock will never be released. In most use cases, this is not a problem, as foreach should properly call Dispose. It could be a problem, however, if a consumer retrieves an explicit Enumerator instance. Is my only option to document the class with a caveat implementer reminding the consumer to call Dispose if using the Enumerator explicitly or is there a way to safely release the lock during finalization? I'm thinking not, since the finalizer doesn't even run on the same thread, but I was curious if there other ways to improve this.

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• Messing with Encoding and XslCompiledTransform

  - by Josemalive

  Hello, im messing with the encodings. For one hand i have a url that is responding me in UTF-8 (im pretty sure thanks to firebug plugin). Im opening the url reading the content in UTF-8 using the following code: StreamReader reader = new StreamReader(response.GetResponseStream(),System.Text.Encoding.UTF8); For other hand i have a transformation xslt sheet with the following code: <?xml version="1.0" encoding="utf-8"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:msxsl="urn:schemas-microsoft-com:xslt" exclude-result-prefixes="msxsl"> <xsl:output method="xml" indent="yes"/> <xsl:template match="@* | node()"> <xsl:copy> <xsl:apply-templates select="@* | node()"/> <br/> hello </xsl:copy> </xsl:template> </xsl:stylesheet> This xslt sheet is saved in UTF-8 format too. I use the following code to mix the xml with the xslt: StringWriter writer = new StringWriter(); XslCompiledTransform transformer = new XslCompiledTransform(); transformer.Load(HttpContext.Current.Server.MapPath("xslt\\xsltsheet.xslt"); XmlWriterSettings xmlsettings = new XmlWriterSettings(); xmlsettings.Encoding = System.Text.Encoding.UTF8; transformer.Transform(xmlreader, null, writer); return writer; Then after all im render in the webbrowser the content of this writer and im getting the following error: The XML page cannot be displayed Cannot view XML input using style sheet. Please correct the error and then click the Refresh button, or try again later. Switch from current encoding to specified encoding not supported. Error processing resource 'http://localhost:2541/Results.... <?xml version="1.0" encoding="utf-16"?> Im wondering where is finding the UTF-16 encoding take in count that: All my files are saved as UTF-8 The response from the server is in UTF-8 The way of read the xslt sheet is configured as UTF-8. Any help would be appreciated. Thanks in advance. Best Regards. Jose.

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• Linq To Sql Concat() dropping fields in created TSQL

  - by user191468

  This is strange. I am moving a stored proc to a service. The TSQL unions multiple selects. To replicate this I created multiple queries resulting in a common new concrete type. Then I issue a return result.ToString(); and the resulting SQL selects have varying numbers of columns specified thus causing an MSSQL Msg 205... using (var db = GetDb()) { var fundInv = from f in db.funds select new Investments { Company = f.company, FullName = f.fullname, Admin = f.admin, Fund = f.fund1, FundCode = f.fundcode, Source = STR_FUNDS, IsPortfolio = false, IsActive = f.active, Strategy = f.strategy, SubStrategy = f.substrategy, AltStrategy = f.altstrategy, AltSubStrategy = f.altsubstrategy, Region = f.region, AltRegion = f.altregion, UseAlternate = f.usealt, ClassesAllowed = f.classallowed }; var stocksInv = from s in db.stocks where !fundInv.Select(f => f.Company).Contains(s.vehcode) select new Investments { Company = s.company, FullName = s.issuer, Admin = STR_PRS, Fund = s.shortname, FundCode = s.vehcode, Source = STR_STOCK, IsPortfolio = false, IsActive = (s.inactive == null), Strategy = s.style, SubStrategy = s.substyle, AltStrategy = s.altstyle, AltSubStrategy = s.altsubsty, Region = s.geography, AltRegion = s.altgeo, UseAlternate = s.usealt, ClassesAllowed = STR_GENERIC }; var bondsInv = from oi in db.bonds where !fundInv.Select(f => f.Company).Contains(oi.vehcode) select new Investments { Company = string.Empty, FullName = oi.issue, Admin = STR_PRS1, Fund = oi.issue, FundCode = oi.vehcode, Source = STR_BONDS, IsPortfolio = false, IsActive = oi.closed, Strategy = STR_OTH, SubStrategy = STR_OTH, AltStrategy = STR_OTH, AltSubStrategy = STR_OTH, Region = STR_OTH, AltRegion = STR_OTH, UseAlternate = false, ClassesAllowed = STR_GENERIC }; return (fundInv.Concat(stocksInv).Concat(bondsInv)).ToList(); } The code above results in a complex select statement where each "table" above has different column count. (see SQL below) I've been trying a few things but no change yet. Ideas are welcome. SELECT [t6].[company] AS [Company], [t6].[fullname] AS [FullName], [t6].[admin] AS [Admin], [t6].[fund] AS [Fund], [t6].[fundcode] AS [FundCode], [t6].[value] AS [Source], [t6].[value2] AS [IsPortfolio], [t6].[active] AS [IsActive], [t6].[strategy] AS [Strategy], [t6].[substrategy] AS [SubStrategy], [t6].[altstrategy] AS [AltStrategy], [t6].[altsubstrategy] AS [AltSubStrategy], [t6].[region] AS [Region], [t6].[altregion] AS [AltRegion], [t6].[usealt] AS [UseAlternate], [t6].[classallowed] AS [ClassesAllowed] FROM ( SELECT [t3].[company], [t3].[fullname], [t3].[admin], [t3].[fund], [t3].[fundcode], [t3].[value], [t3].[value2], [t3].[active], [t3].[strategy], [t3].[substrategy], [t3].[altstrategy], [t3].[altsubstrategy], [t3].[region], [t3].[altregion], [t3].[usealt], [t3].[classallowed] FROM ( SELECT [t0].[company], [t0].[fullname], [t0].[admin], [t0].[fund], [t0].[fundcode], @p0 AS [value], [t0].[active], [t0].[strategy], [t0].[substrategy], [t0].[altstrategy], [t0].[altsubstrategy], [t0].[region], [t0].[altregion], [t0].[usealt], [t0].[classallowed] FROM [zInvest].[funds] AS [t0] UNION ALL SELECT [t1].[company], [t1].[issuer], @p6 AS [value], [t1].[shortname], [t1].[vehcode], @p7 AS [value2], @p8 AS [value3], (CASE WHEN [t1].[inactive] IS NULL THEN 1 ELSE 0 END) AS [value5], [t1].[style], [t1].[substyle], [t1].[altstyle], [t1].[altsubsty], [t1].[geography], [t1].[altgeo], [t1].[usealt], @p10 AS [value6] FROM [zBank].[stocks] AS [t1] WHERE (NOT (EXISTS( SELECT NULL AS [EMPTY] FROM [zInvest].[funds] AS [t2] WHERE [t2].[company] = [t1].[vehcode] ))) AND ([t1].[vehcode] <> @p2) AND (SUBSTRING([t1].[vehcode], @p3 + 1, @p4) <> @p5) ) AS [t3] UNION ALL SELECT @p11 AS [value], [t4].[issue], @p12 AS [value2], [t4].[vehcode], @p13 AS [value3], @p14 AS [value4], [t4].[closed], @p16 AS [value6], @p17 AS [value7] FROM [zMut].[bonds] AS [t4] WHERE NOT (EXISTS( SELECT NULL AS [EMPTY] FROM [zInvest].[funds] AS [t5] WHERE [t5].[company] = [t4].[vehcode] )) ) AS [t6]

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• Connecting to Active Directory Application Mode from Perl

  - by Khurram Aziz

  I am trying to connect to Active Directory Application Mode instance. The instance is conenctable from third party LDAP clients like Softerra LDAP Browser. But I am getting the following error when connecting from Perl Net::LDAP=HASH(0x876d8e4) sending: Net::LDAP=HASH(0x876d8e4) received: 30 84 00 00 00 A7 02 01 02 65 84 00 00 00 9E 0A 0........e...... 01 01 04 00 04 84 00 00 00 93 30 30 30 30 30 34 ..........000004 44 43 3A 20 4C 64 61 70 45 72 72 3A 20 44 53 49 DC: LdapErr: DSI 44 2D 30 43 30 39 30 36 32 42 2C 20 63 6F 6D 6D D-0C09062B, comm 65 6E 74 3A 20 49 6E 20 6F 72 64 65 72 20 74 6F ent: In order to 20 70 65 72 66 6F 72 6D 20 74 68 69 73 20 6F 70 perform this op 65 72 61 74 69 6F 6E 20 61 20 73 75 63 63 65 73 eration a succes 73 66 75 6C 20 62 69 6E 64 20 6D 75 73 74 20 62 sful bind must b 65 20 63 6F 6D 70 6C 65 74 65 64 20 6F 6E 20 74 e completed on t 68 65 20 63 6F 6E 6E 65 63 74 69 6F 6E 2E 2C 20 he connection., 64 61 74 61 20 30 2C 20 76 65 63 65 00 __ __ __ data 0, vece.` My directory structure is Partition: CN=Apps,DC=MyCo,DC=COM User exists as CN=myuser,CN=Apps,DC=MyCo,DC=COM I have couple of other entries of the custom class which I am interested to browse; those instances appear fine in ADSI Edit, Softerra LDAP Browser etc. I am new to Perl....My perl code is #!/usr/bin/perl use Net::LDAP; $ldap = Net::LDAP->new("127.0.0.1", debug => 2, user => "CN=myuser,CN=Apps,DC=MyCo,DC=COM", password => "secret" ) or die "$@"; $ldap->bind(version => 3) or die "$@"; print "Connected to ldap\n"; $mesg = $ldap->search( filter => "(objectClass=*)" ) or die ("Failed on search.$!"); my $max = $mesg->count; print "$max records found!\n"; for( my $index = 0 ; $index < $max ; $index++) { my $entry = $mesg->entry($index); my $dn = $entry->dn; @attrs = $entry->attributes; foreach my $var (@attrs) { $attr = $entry->get_value( $var, asref => 1 ); if ( defined($attr) ) { foreach my $value ( @$attr ) { print "$var: $value\n"; } } } } $ldap->unbind();

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• How to select one object from a NSArray?

  - by 0SX

  First of all Merry Christmas to everyone!!! Currently I have a NSArray that has parsed content in it. When I do a NSLog of the array it prints out 20 objects with the parsed content that I needed. Like so: 2010-12-24 20:27:32.170 TestProject[48914:298] SomeContent 2010-12-24 20:27:32.172 TestProject[48914:298] SomeContent1 2010-12-24 20:27:32.172 TestProject[48914:298] SomeContent2 2010-12-24 20:27:32.173 TestProject[48914:298] SomeContent3 2010-12-24 20:27:32.173 TestProject[48914:298] SomeContent4 2010-12-24 20:27:32.173 TestProject[48914:298] SomeContent5 2010-12-24 20:27:32.174 TestProject[48914:298] SomeContent6 2010-12-24 20:27:32.175 TestProject[48914:298] SomeContent7 2010-12-24 20:27:32.176 TestProject[48914:298] SomeContent8 2010-12-24 20:27:32.176 TestProject[48914:298] SomeContent9 2010-12-24 20:27:32.177 TestProject[48914:298] SomeContent10 2010-12-24 20:27:32.177 TestProject[48914:298] SomeContent11 2010-12-24 20:27:32.177 TestProject[48914:298] SomeContent12 2010-12-24 20:27:32.179 TestProject[48914:298] SomeContent13 2010-12-24 20:27:32.179 TestProject[48914:298] SomeContent14 2010-12-24 20:27:32.180 TestProject[48914:298] SomeContent15 2010-12-24 20:27:32.180 TestProject[48914:298] SomeContent16 2010-12-24 20:27:32.181 TestProject[48914:298] SomeContent17 2010-12-24 20:27:32.181 TestProject[48914:298] SomeContent18 2010-12-24 20:27:32.190 TestProject[48914:298] SomeContent19 However, I don't need every object at once. I need to be able to pick out one object at a time so I can put each object into a string of it's own. If anyone knows a easier way to do this then what I'm trying to please let me know. Anyways, I need to be able to choose just one object depending on what object I need. For example, let's say I only need object #5 and not all the array, how can this be done so I can put it into a string? I'm thinking I might have to use the index feature but I'm not sure how to set it up properly. Here is my NSArray that I'm working with: NSArray* myArray = [document selectElements: @"div.someContent"]; NSMutableArray* results = [NSMutableArray array]; for (Element* element in myArray){ NSString* snipet = [element contentsSource]; [results addObject: snipet]; NSLog(@"%@", snipet); } NSLog(@"%i",myArray.count); I've already spent several hours trying to achieve this but my knowledge with array's is limited even with me reading the documentation. :-( Any help is much appreciated. Thanks

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• F#: Advantages of converting top-level functions to member methods?

  - by J Cooper

  Earlier I requested some feedback on my first F# project. Before closing the question because the scope was too large, someone was kind enough to look it over and leave some feedback. One of the things they mentioned was pointing out that I had a number of regular functions that could be converted to be methods on my datatypes. Dutifully I went through changing things like let getDecisions hand = let (/=/) card1 card2 = matchValue card1 = matchValue card2 let canSplit() = let isPair() = match hand.Cards with | card1 :: card2 :: [] when card1 /=/ card2 -> true | _ -> false not (hasState Splitting hand) && isPair() let decisions = [Hit; Stand] let split = if canSplit() then [Split] else [] let doubleDown = if hasState Initial hand then [DoubleDown] else [] decisions @ split @ doubleDown to this: type Hand // ...stuff... member hand.GetDecisions = let (/=/) (c1 : Card) (c2 : Card) = c1.MatchValue = c2.MatchValue let canSplit() = let isPair() = match hand.Cards with | card1 :: card2 :: [] when card1 /=/ card2 -> true | _ -> false not (hand.HasState Splitting) && isPair() let decisions = [Hit; Stand] let split = if canSplit() then [Split] else [] let doubleDown = if hand.HasState Initial then [DoubleDown] else [] decisions @ split @ doubleDown Now, I don't doubt I'm an idiot, but other than (I'm guessing) making C# interop easier, what did that gain me? Specifically, I found a couple *dis*advantages, not counting the extra work of conversion (which I won't count, since I could have done it this way in the first place, I suppose, although that would have made using F# Interactive more of a pain). For one thing, I'm now no longer able to work with function "pipelining" easily. I had to go and change some |> chained |> calls to (some |> chained).Calls etc. Also, it seemed to make my type system dumber--whereas with my original version, my program needed no type annotations, after converting largely to member methods, I got a bunch of errors about lookups being indeterminate at that point, and I had to go and add type annotations (an example of this is in the (/=/) above). I hope I haven't come off too dubious, as I appreciate the advice I received, and writing idiomatic code is important to me. I'm just curious why the idiom is the way it is :) Thanks!

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• The Skyline Problem.

  - by zeroDivisible

  I just came across this little problem on UVA's Online Judge and thought, that it may be a good candidate for a little code-golf. The problem: You are to design a program to assist an architect in drawing the skyline of a city given the locations of the buildings in the city. To make the problem tractable, all buildings are rectangular in shape and they share a common bottom (the city they are built in is very flat). The city is also viewed as two-dimensional. A building is specified by an ordered triple (Li, Hi, Ri) where Li and Ri are left and right coordinates, respectively, of building i and Hi is the height of the building. In the diagram below buildings are shown on the left with triples (1,11,5), (2,6,7), (3,13,9), (12,7,16), (14,3,25), (19,18,22), (23,13,29), (24,4,28) and the skyline, shown on the right, is represented by the sequence: 1, 11, 3, 13, 9, 0, 12, 7, 16, 3, 19, 18, 22, 3, 23, 13, 29, 0 The output should consist of the vector that describes the skyline as shown in the example above. In the skyline vector (v1, v2, v3, ... vn) , the vi such that i is an even number represent a horizontal line (height). The vi such that i is an odd number represent a vertical line (x-coordinate). The skyline vector should represent the "path" taken, for example, by a bug starting at the minimum x-coordinate and traveling horizontally and vertically over all the lines that define the skyline. Thus the last entry in the skyline vector will be a 0. The coordinates must be separated by a blank space. If I will not count declaration of provided (test) buildings and including all spaces and tab characters, my solution, in Python, is 223 characters long. Here is the condensed version: B=[[1,11,5],[2,6,7],[3,13,9],[12,7,16],[14,3,25],[19,18,22],[23,13,29],[24,4,28]] # Solution. R=range v=[0 for e in R(max([y[2] for y in B])+1)] for b in B: for x in R(b[0], b[2]): if b[1]>v[x]: v[x]=b[1] p=1 k=0 for x in R(len(v)): V=v[x] if p and V==0: continue elif V!=k: p=0 print "%s %s" % (str(x), str(V)), k=V I think that I didn't made any mistake but if so - feel free to criticize me. EDIT I don't have much reputation, so I will pay only 100 for a bounty - I am curious, if anyone could try to solve this in less than .. lets say, 80 characters. Solution posted by cobbal is 101 characters long and currently it is the best one. ANOTHER EDIT I thought, that 80 characters is a sick limit for this kind of problem. cobbal, with his 46 character solution totaly amazed me - though I must admit, that I spent some time reading his explanation before I partially understood what he had written.

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• mySQL :syntax using in C#

  - by Meko

  Hi. I am using in C# MYsql .I have query that works if I run on MySql Workbench ,but in C# it does not return any value also does not give ant error too.There is only one different using on Mysql I use before table name databaseName.tableName , but in C# I think it doesn`t necessary. This is part of query which does not return anything. "(select Lesson_Name from schedule where Group_NO = (select Group_NO from sinif inner join student ON sinif.Group_ID=student.Group_ID where Student_Name=(?Student))"+ " And Day_Name =(select Day_Name from day inner join date ON day.Day_ID=date.DayName where Date=(?Date))" + "And Lesson_Time= (select Lesson_Time from clock where Lesson_Time <= (?Time)order by Lesson_Time DESC limit 0, 1) " + " And Week_NO = (select Week_NO from week inner join date ON week.Week_ID=date.Week_ID where Date=(?Date))) And Here all codes which executes when user click button. private void check_B_Click(object sender, EventArgs e) { connection.Open(); for (int i = 0; i < existingStudents.Count; i++) { MySqlCommand cmd1 = new MySqlCommand("select Student_Name,Student_Surname,Student_MacAddress from student ", connection); MySqlCommand cmd2 = new MySqlCommand("insert into check_list (Student,Mac_Address,Date,Time,Lesson_Name)"+ "values((?Student),(?MacAddress),(?Date),(?Time),"+ "(select Lesson_Name from schedule where Group_NO = (select Group_NO from sinif inner join student ON sinif.Group_ID=student.Group_ID where Student_Name=(?Student))"+ " And Day_Name =(select Day_Name from day inner join date ON day.Day_ID=date.DayName where Date=(?Date))" + "And Lesson_Time= (select Lesson_Time from clock where Lesson_Time <= (?Time)order by Lesson_Time DESC limit 0, 1) " + " And Week_NO = (select Week_NO from week inner join date ON week.Week_ID=date.Week_ID where Date=(?Date))))", connection); MySqlParameter param1 = new MySqlParameter(); param1.ParameterName = "?Student"; reader = cmd1.ExecuteReader(); if (reader.HasRows) while (reader.Read()) { if (reader["Student_MacAddress"].ToString() == existingStudentsMac[i].ToString()) param1.Value = reader["Student_Name" ]+" "+reader["Student_Surname"]; } reader.Close(); MySqlParameter param2 = new MySqlParameter(); param2.ParameterName = "?MacAddress"; param2.Value = existingStudentsMac[i]; MySqlParameter param3 = new MySqlParameter(); param3.ParameterName = "?Date"; param3.Value = DateTime.Today.Date; MySqlParameter param4 = new MySqlParameter(); param4.ParameterName = "?Time"; param4.Value = DateTime.Now.ToString("HH:mm"); cmd2.Parameters.Add(param1); cmd2.Parameters.Add(param2); cmd2.Parameters.Add(param3); cmd2.Parameters.Add(param4); cmd2.ExecuteNonQuery(); } connection.Close(); MessageBox.Show("Sucsess :)"); }

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• MediaElement fails after several plays.

  - by basilkot

  Hi! I have a problem with MediaElement control. I've put six MediaElements on my form, then I start them and change played files by timer. After several times, these elements stop playing. Here is the sample XAML: <Grid> <Grid.RowDefinitions> <RowDefinition Height="*" /> <RowDefinition Height="*" /> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="*" /> <ColumnDefinition Width="*" /> <ColumnDefinition Width="*" /> </Grid.ColumnDefinitions> <MediaElement x:Name="element1" UnloadedBehavior="Close" LoadedBehavior="Manual" Grid.Column="0" Grid.Row="0" /> <MediaElement x:Name="element2" UnloadedBehavior="Close" LoadedBehavior="Manual" Grid.Column="1" Grid.Row="0" /> <MediaElement x:Name="element3" UnloadedBehavior="Close" LoadedBehavior="Manual" Grid.Column="2" Grid.Row="0" /> <MediaElement x:Name="element4" UnloadedBehavior="Close" LoadedBehavior="Manual" Grid.Column="0" Grid.Row="1" /> <MediaElement x:Name="element5" UnloadedBehavior="Close" LoadedBehavior="Manual" Grid.Column="1" Grid.Row="1" /> <MediaElement x:Name="element6" UnloadedBehavior="Close" LoadedBehavior="Manual" Grid.Column="2" Grid.Row="1" /> Here is the sample code: // The code below repeats for each MediaElement List<string> playlist1 = new List<string>() { @"file1.wmv", @"file2.wmv", @"file3.wmv", @"file4.wmv" }; DispatcherTimer timer1 = null; int index1 = 0; ... void Window1_Loaded(object sender, RoutedEventArgs e) { timer1 = new DispatcherTimer(); timer1.Tick += new EventHandler(timer1_Elapsed); timer1.Interval = TimeSpan.FromSeconds(10); element1.Source = new Uri(playlist1[index1]); timer1.Start(); element1.Play(); ... } void timer1_Elapsed(object sender, EventArgs e) { Dispatcher.BeginInvoke(DispatcherPriority.Normal, (System.Threading.ThreadStart)delegate() { element1.Stop(); element1.Close(); timer1.Stop(); index1++; if (index1 >= playlist1.Count) { index1 = 0; } element1.Source = new Uri(playlist1[index1]); timer1.Start(); element1.Play(); }); } ... Does anybody have similar problems?

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• Why does my UIActivityIndicatorView only display once?

  - by Schwigg

  I'm developing an iPhone app that features a tab-bar based navigation with five tabs. Each tab contains a UITableView whose data is retrieved remotely. Ideally, I would like to use a single UIActivityIndicatorView (a subview of the window) that is started/stopped during this remote retrieval - once per tab. Here's how I set up the spinner in the AppDelegate: - (void)applicationDidFinishLaunching:(UIApplication *)application { [window addSubview:rootController.view]; activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge]; [activityIndicator setCenter:CGPointMake(160, 200)]; [window addSubview:activityIndicator]; [window makeKeyAndVisible]; } Since my tabs were all performing a similiar function, I created a base class that all of my tabs' ViewControllers inherit from. Here is the method I'm using to do the remote retrieval: - (void)parseXMLFileAtURL:(NSString *)URL { NSAutoreleasePool *apool = [[NSAutoreleasePool alloc] init]; AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate]; NSLog(@"parseXMLFileAtURL started."); [appDelegate.activityIndicator startAnimating]; NSLog(@"appDelegate.activityIndicator: %@", appDelegate.activityIndicator); articles = [[NSMutableArray alloc] init]; NSURL *xmlURL = [NSURL URLWithString:URL]; rssParser = [[NSXMLParser alloc] initWithContentsOfURL:xmlURL]; [rssParser setDelegate:self]; [rssParser setShouldProcessNamespaces:NO]; [rssParser setShouldReportNamespacePrefixes:NO]; [rssParser setShouldResolveExternalEntities:NO]; [rssParser parse]; NSLog(@"parseXMLFileAtURL finished."); [appDelegate.activityIndicator stopAnimating]; [apool release]; } This method is being called by each view controller as follows: - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; if ([articles count] == 0) { NSString *path = @"http://www.myproject.com/rss1.xml"; [self performSelectorInBackground:@selector(parseXMLFileAtURL:) withObject:path]; } } This works great while the application loads the first tab's content. I'm presented with the empty table and the spinner. As soon as the content loads, the spinner goes away. Strangely, when I click the second tab, the NSLog messages from the -parseXMLFileAtURL: method show up in the log, but the screen hangs on the first tab's view and I do not see the spinner. As soon as the content is done downloading, the second tab's view appears. I suspect this has something to do with threading, with which I'm still becoming acquainted. Am I doing something obviously wrong here?

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• i don't solve "must declare a body because it is not marked abstract, extern, or partial" problem?

  - by programmerist

  How can i solve "must declare a body because it is not marked abstract, extern, or partial". This problem. Can you show me some advices? Full Error message is about Save, Update, Delete, Select events... Full message sample : GenoTip.DAL._AccessorForSQL.Save(string, System.Collections.Specialized.ListDictionary, System.Data.CommandType)' must declare a body because it is not marked abstract, extern, or partial This error also return in Update, Delete, Select... public abstract class _AccessorForSQL { public virtual bool Save(string sp, ListDictionary ld, CommandType cmdType); public virtual bool Update(); public virtual bool Delete(); public virtual DataSet Select(); } class GenAccessor : _AccessorForSQL { DataSet ds; DataTable dt; public override bool Save(string sp, ListDictionary ld, CommandType cmdType) { SqlConnection con = null; SqlCommand cmd = null; SqlDataReader dr = null; try { con = GetConnection(); cmd = new SqlCommand(sp, con); con.Open(); cmd.CommandType = cmdType; foreach (string ky in ld.Keys) { cmd.Parameters.AddWithValue(ky, ld[ky]); } dr = cmd.ExecuteReader(); ds = new DataSet(); dt = new DataTable(); ds.Tables.Add(dt); ds.Load(dr, LoadOption.OverwriteChanges, dt); } catch (Exception exp) { HttpContext.Current.Trace.Warn("Error in GetCustomerByID()", exp.Message, exp); } finally { if (dr != null) dr.Close(); if (con != null) con.Close(); } return (ds.Tables[0].Rows.Count 0) ? true : false; } public override bool Update() { return true; } public override bool Delete() { return true; } public override DataSet Select() { DataSet dst = new DataSet(); return dst; } private static SqlConnection GetConnection() { string connStr = WebConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString; SqlConnection conn = new SqlConnection(connStr); return conn; }

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• Switching from MDI to SDI and Back Again

  - by Mike Hofer

  This sounds like it would be a simple task, but I'm running into some issues. I have some fairly straightforward code for my C# application: private void SwitchToSdi() { MainWindow mainWindow = GetMainWindow(); for (int index = mainWindow.MdiChildren.Length - 1; index >= 0; index--) { Form form = mainWindow.MdiChildren[index]; if (!(form is MainWindow)) { form.Visible = false; form.MdiParent = null; form.Visible = true; mainWindow.MdiChildren[index] = null; } } mainWindow.IsMdiContainer = false; } And then, private void SwitchToMdi() { MainWindow mainWindow = GetMainWindow(); mainWindow.IsMdiContainer = true; for (int index = Application.OpenForms.Count - 1; index >= 0; index--) { Form form = Application.OpenForms[index]; if (!(form is MainWindow)) { form.Visible = false; form.MdiParent = mainWindow; form.Visible = true; } } } Note that MainWindow is an MDI parent window, with its IsMdiContainer property set to True. The user can toggle between MDI and SDI in the Options dialog. That much works beautifully. If I switch to SDI, the new windows open up OUTSIDE the main window, which is great. Similarly, if I switch to MDI, they open up inside the container. However, I've noticed a few things. Open MDI child windows don't become SDI windows as I would have expected them to. Open SDI windows don't become MDI child windows as I would have expected them to. Even after I set IsMdiContainer to true in the call to SwitchToMdi(), if I try to open a new window, I get an exception that tells me that the main window isn't an MDI container. o_O Someone please throw me a bone here. This shouldn't be rocket science. But I'm not finding a whole lot of useful help out there on the Intarwebs (read: g00gle is fairly useless). Has anyone actually implemented this behavior in .NET before? How did you achieve it? What am I missing here? Halp!

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• TVirtualStringTree - resetting non-visual nodes and memory consumption

  - by Remy Lebeau - TeamB

  I have an app that loads records from a binary log file and displays them in a virtual TListView. There are potentially millions of records in a file, and the display can be filtered by the user, so I do not load all of the records in memory at one time, and the ListView item indexes are not a 1-to-1 relation with the file record offsets (List item 1 may be file record 100, for instance). I use the ListView's OnDataHint event to load records for just the items the ListView is actually interested in. As the user scrolls around, the range specified by OnDataHint changes, allowing me to free records that are not in the new range, and allocate new records as needed. This works fine, speed is tolerable, and the memory footprint is very low. I am currently evaluating TVirtualStringTree as a replacement for the TListView, mainly because I want to add the ability to expand/collapse records that span multiple lines (I can fudge it with the TListView by incrementing/decrementing the item count dynamically, but this is not as straight forward as using a real tree). For the most part, I have been able to port the TListView logic and have everything work as I need. I notice that TVirtualStringTree's virtual paradigm is vastly different, though. It does not have the same kind of OnDataHint functionality that TListView does (I can use the OnScroll event to fake it, which allows my memory buffer logic to continue working), and I can use the OnInitializeNode event to associate nodes with records that are allocated. However, once a tree node is initialized, it sees that it remains initialized for the lifetime of the tree. That is not good for me. As the user scrolls around and I remove records from memory, I need to reset those non-visual nodes without removing them from the tree completely, or losing their expand/collapse states. When the user scrolls them back into view, I can re-allocate the records and re-initialize the nodes. Basically, I want to make TVirtualStringTree act as much like TListView as possible, as far as its virtualization is concerned. I have seen that TVirtualStringTree has a ResetNode() method, but I encounter various errors whenever I try to use it. I must be using it wrong. I also thought of just storing a data pointer inside each node to my record buffers, and I allocate and free memory, update those pointers accordingly. The end effect does not work so well, either. Worse, my largest test log file has ~5 million records in it. If I initialize the TVirtualStringTree with that many nodes at one time (when the log display is unfiltered), the tree's internal overhead for its nodes takes up a whopping 260MB of memory (without any records being allocated yet). Whereas with the TListView, loading the same log file and all the memory logic behind it, I can get away with using just a few MBs. Any ideas?

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• Lawler's Algorithm Implementation Assistance

  - by Richard Knop

  Here is my implemenation of Lawler's algorithm in PHP (I know... but I'm used to it): <?php $jobs = array(1, 2, 3, 4, 5, 6); $jobsSubset = array(2, 5, 6); $n = count($jobs); $processingTimes = array(2, 3, 4, 3, 2, 1); $dueDates = array(3, 15, 9, 7, 11, 20); $optimalSchedule = array(); foreach ($jobs as $j) { $optimalSchedule[] = 0; } $dicreasedCardinality = array(); for ($i = $n; $i >= 1; $i--) { $x = 0; $max = 0; // loop through all jobs for ($j = 0; $j < $i; $j++) { // ignore if $j already is in the $dicreasedCardinality array if (false === in_array($j, $dicreasedCardinality)) { // if the job has no succesor in $jobsSubset if (false === isset($jobs[$j+1]) || false === in_array($jobs[$j+1], $jobsSubset)) { // here I find an array index of a job with the maximum due date // amongst jobs with no sucessor in $jobsSubset if ($x < $dueDates[$j]) { $x = $dueDates[$j]; $max = $j; } } } } // move the job at the end of $optimalSchedule $optimalSchedule[$i-1] = $jobs[$max]; // decrease the cardinality of $jobs $dicreasedCardinality[] = $max; } print_r($optimalSchedule); Now the above returns an optimal schedule like this: Array ( [0] => 1 [1] => 1 [2] => 1 [3] => 3 [4] => 2 [5] => 6 ) Which doesn't seem right to me. The problem might be with my implementation of the algorithm because I am not sure I understand it correctly. I used this source to implement it: http://www.google.com/books?id=aSiBs6PDm9AC&pg=PA166&dq=lawler%27s+algorithm+code&lr=&hl=sk&cd=4#v=onepage&q=&f=false The description there is a little confusing. For example, I didn't quite get how is the subset D defined (I guess it is arbitrary). Could anyone help me out with this? I have been trying to find some sources with simpler explanation of the algorithm but all sources I found were even more complicated (with math proofs and such) so I am stuck with the link above. Yes, this is a homework, if it wasn't obvious. I still have few weeks to crack this but I have spent few days already trying to get how exactly this algorithm works with no success so I don't think I will get any brighter during that time.

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• WPF: Binding to ObservableCollection in ControlTemplate is not updated

  - by Julian Lettner

  I created a ControlTemplate for my custom control MyControl. MyControl derives from System.Windows.Controls.Control and defines the following property public ObservableCollection<MyControl> Children{ get; protected set; }. To display the nested child controls I am using an ItemsControl (StackPanel) which is surrounded by a GroupBox. If there are no child controls, I want to hide the GroupBox. Everything works fine on application startup: The group box and child controls are shown if the Children property initially contained at least one element. In the other case it is hidden. The problem starts when the user adds a child control to an empty collection. The GroupBox's visibility is still collapsed. The same problem occurs when the last child control is removed from the collection. The GroupBox is still visible. Another symptom is that the HideEmptyEnumerationConverter converter does not get called. Adding/removing child controls to non empty collections works as expected. Whats wrong with the following binding? Obviously it works once but does not get updated, although the collection I am binding to is of type ObservableCollection. <!-- Converter for hiding empty enumerations --> <Common:HideEmptyEnumerationConverter x:Key="hideEmptyEnumerationConverter"/> <!--- ... ---> <ControlTemplate TargetType="{x:Type MyControl}"> <!-- ... other stuff that works ... --> <!-- Child components --> <GroupBox Header="Children" Visibility="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Children, Converter={StaticResource hideEmptyEnumerationConverter}}"> <ItemsControl ItemsSource="{TemplateBinding Children}"/> </GroupBox> </ControlTemplate> . [ValueConversion(typeof (IEnumerable), typeof (Visibility))] public class HideEmptyEnumerationConverter : IValueConverter { #region IValueConverter Members public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { int itemCount = ((IEnumerable) value).Cast<object>().Count(); return itemCount == 0 ? Visibility.Collapsed : Visibility.Visible; } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { throw new NotImplementedException(); } #endregion } Another, more general question: How do you guys debug bindings? Found this (http://bea.stollnitz.com/blog/?p=52) but still I find it very hard to do. I am glad for any help or suggestion.

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• ASP.NET MVC ajax chat

  - by nccsbim071

  I built an ajax chat in one of my mvc website. everything is working fine. I am using polling. At certain interval i am using $.post to get the messages from the db. But there is a problem. The message retrieved using $.post keeps on repeating. here is my javascript code and controller method. var t; function GetMessages() { var LastMsgRec = $("#hdnLastMsgRec").val(); var RoomId = $("#hdnRoomId").val(); //Get all the messages associated with this roomId $.post("/Chat/GetMessages", { roomId: RoomId, lastRecMsg: LastMsgRec }, function(Data) { if (Data.Messages.length != 0) { $("#messagesCont").append(Data.Messages); if (Data.newUser.length != 0) $("#usersUl").append(Data.newUser); $("#messagesCont").attr({ scrollTop: $("#messagesCont").attr("scrollHeight") - $('#messagesCont').height() }); $("#userListCont").attr({ scrollTop: $("#userListCont").attr("scrollHeight") - $('#userListCont').height() }); } else { } $("#hdnLastMsgRec").val(Data.LastMsgRec); }, "json"); t = setTimeout("GetMessages()", 3000); } and here is my controller method to get the data: public JsonResult GetMessages(int roomId,DateTime lastRecMsg) { StringBuilder messagesSb = new StringBuilder(); StringBuilder newUserSb = new StringBuilder(); List<Message> msgs = (dc.Messages).Where(m => m.RoomID == roomId && m.TimeStamp > lastRecMsg).ToList(); if (msgs.Count == 0) { return Json(new { Messages = "", LastMsgRec = System.DateTime.Now.ToString() }); } foreach (Message item in msgs) { messagesSb.Append(string.Format(messageTemplate,item.User.Username,item.Text)); if (item.Text == "Just logged in!") newUserSb.Append(string.Format(newUserTemplate,item.User.Username)); } return Json(new {Messages = messagesSb.ToString(),LastMsgRec = System.DateTime.Now.ToString(),newUser = newUserSb.ToString().Length == 0 ?"":newUserSb.ToString()}); } Everything is working absloutely perfect. But i some messages getting repeated. The first time page loads i am retrieving the data and call GetMessages() function. I am loading the value of field hdnLastMsgRec the first time page loads and after the value for this field are set by the javascript. I think the message keeps on repeating because of asynchronous calls. I don't know, may be you guys can help me solve this. or you can suggest better way to implement this.

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• Trying to read FormsAuthentication tickets to read in other areas of site

  - by Pasha Aryana

  Hi, NOTE: I have included 3 links in here to my localhost areas but could not submit the post so I seperetaed them with a space character so it would post on stackoverflow. I currently have 2 ASP.NET MVC apps in my solution. First I run the first one by setting it to be startup project. It goes to the login page, from there once the data has been entered I execute the following code: var authTicket = new FormsAuthenticationTicket(1, login.LoginDataContract.MSISDN, DateTime.Now, DateTime.Now.AddMinutes(Convert.ToDouble("30")), true, ""); string cookieContents = FormsAuthentication.Encrypt(authTicket); var cookie = new HttpCookie(FormsAuthentication.FormsCookieName, cookieContents) { Expires = authTicket.Expiration, //Path = FormsAuthentication.FormsCookiePath //Path = "http://localhost" Domain = "" }; if (System.Web.HttpContext.Current != null) { System.Web.HttpContext.Current.Response.Cookies.Add(cookie); } As you can see I have set the Domain = "", so theoretically speaking it should work on any thing under my http: //localhost. Then I have set the persist security of the cookie to true so I can access it from any where under localhost. The cookie writes fine and I get logged in and all godd for now. BTW the url for this login page is: http //localhost/MyAccount/Login Now then I stop the solution and set the other MVC apps to be the startup. Then I run it. The URL for the second site is: http: //localhost/WebActivations/ Here is the code in the other apps start controller: public class HomeController : Controller { public ActionResult Index() { ViewData["Message"] = "Welcome to ASP.NET MVC!"; // PASHA: Added code to read the authorization cookie set at // login in MyAccount *.sln for (int i = 0; i < System.Web.HttpContext.Current.Request.Cookies.Count;i++) { Response.Write(System.Web.HttpContext.Current.Request.Cookies[i].Name + " " + System.Web.HttpContext.Current.Request.Cookies[i].Value); } HttpCookie authorizationCookie = System.Web.HttpContext.Current.Request.Cookies[FormsAuthentication.FormsCookieName.ToString()]; // decrypt. FormsAuthenticationTicket authorizationForm = FormsAuthentication.Decrypt(authorizationCookie.Value); ViewData["Message"] = authorizationForm.UserData[0].ToString(); return View(); } public ActionResult About() { return View(); } The problem is in this Home controller when I run the solution it cannot read the authentication cookie, you see the loop there it does not find the .ASPXAUTH cookie. But once it crashes in Firefox I have a look in the Page Info and then security and Cookies and its there and its the same cookie. What am I doing wrong?

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• Gridview get image from JSON using AsyncTask

  - by kongkea

  This project I've done with image in my drawable but now I want to get image url from JSON by using Asynctask and display it. and I make php that provide a json string like below. I want to get path of image(url) by using AsyncTask from JSON. I want to use data from json instead of public mThumbId = {...}; {"count":"28","data": [{"id":"1", "first_name":"man", "last_name":"woman", "username":"man", "password":"4f70432e636970de9929bcc6f1b72412", "email":"[email protected]", "url":"http://vulcan.wr.usgs.gov/Imgs/Jpg/MSH/Images/MSH64_aerial_view_st_helens_from_NE_09-64_med.jpg"}, {"id":"2", "first_name":"first", "last_name":"Last Name", "username":"user", "password":"1a1dc91c907325c69271ddf0c944bc72", "email":"[email protected]", "url":"http://www.danheller.com/images/California/Marin/Scenics/bird-view-big.jpg"}, {"id":"3", "first_name":"first", "last_name":"Last Name", "username":"user", "password":"1a1dc91c907325c69271ddf0c944bc72", "email":"0", "url":"http://www.hermes.net.au/bodhi/images/view/large/view_03.jpg"}]} AndroidGridLayoutActivity GridView gridView = (GridView) findViewById(R.id.grid_view); gridView.setAdapter(new ImageAdapter(this)); gridView.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> parent, View v, int position, long id) { Intent i = new Intent(getApplicationContext(), FullImageActivity.class); i.putExtra("id", position); startActivity(i); } }); ImageAdapter public class ImageAdapter extends BaseAdapter { private Context mContext; // Keep all Images in array public Integer[] mThumbIds = { R.drawable.pic_1, R.drawable.pic_2, R.drawable.pic_3, R.drawable.pic_4, R.drawable.pic_5, R.drawable.pic_6, R.drawable.pic_7, R.drawable.pic_8, R.drawable.pic_9, R.drawable.pic_10, R.drawable.pic_11, R.drawable.pic_12, R.drawable.pic_13, R.drawable.pic_14, R.drawable.pic_15 }; // Constructor public ImageAdapter(Context c){ mContext = c; } public int getCount() { return mThumbIds.length; } public Object getItem(int position) { return mThumbIds[position]; } public long getItemId(int position) { return 0; } public View getView(int position, View convertView, ViewGroup parent) { ImageView imageView = new ImageView(mContext); imageView.setImageResource(mThumbIds[position]); imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); imageView.setLayoutParams(new GridView.LayoutParams(70, 70)); return imageView; } } FullImageActivity Intent i = getIntent(); int position = i.getExtras().getInt("id"); ImageAdapter imageAdapter = new ImageAdapter(this); ImageView imageView = (ImageView) findViewById(R.id.full_image_view); imageView.setImageResource(imageAdapter.mThumbIds[position]);

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• Problem with bootstrap loader and kernel

  - by dboarman-FissureStudios

  We are working on a project to learn how to write a kernel and learn the ins and outs. We have a bootstrap loader written and it appears to work. However we are having a problem with the kernel loading. I'll start with the first part: bootloader.asm: [BITS 16] [ORG 0x0000] ; ; all the stuff in between ; ; the bottom of the bootstrap loader datasector dw 0x0000 cluster dw 0x0000 ImageName db "KERNEL SYS" msgLoading db 0x0D, 0x0A, "Loading Kernel Shell", 0x0D, 0x0A, 0x00 msgCRLF db 0x0D, 0x0A, 0x00 msgProgress db ".", 0x00 msgFailure db 0x0D, 0x0A, "ERROR : Press key to reboot", 0x00 TIMES 510-($-$$) DB 0 DW 0xAA55 ;************************************************************************* The bootloader.asm is too long for the editor without causing it to chug and choke. In addition, the bootloader and kernel do work within bochs as we do get the message "Welcome to our OS". Anyway, the following is what we have for a kernel at this point. kernel.asm: [BITS 16] [ORG 0x0000] [SEGMENT .text] ; code segment mov ax, 0x0100 ; location where kernel is loaded mov ds, ax mov es, ax cli mov ss, ax ; stack segment mov sp, 0xFFFF ; stack pointer at 64k limit sti mov si, strWelcomeMsg ; load message call _disp_str mov ah, 0x00 int 0x16 ; interrupt: await keypress int 0x19 ; interrupt: reboot _disp_str: lodsb ; load next character or al, al ; test for NUL character jz .DONE mov ah, 0x0E ; BIOS teletype mov bh, 0x00 ; display page 0 mov bl, 0x07 ; text attribute int 0x10 ; interrupt: invoke BIOS jmp _disp_str .DONE: ret [SEGMENT .data] ; initialized data segment strWelcomeMsg db "Welcome to our OS", 0x00 [SEGMENT .bss] ; uninitialized data segment Using nasm 2.06rc2 I compile as such: nasm bootloader.asm -o bootloader.bin -f bin nasm kernel.asm -o kernel.sys -f bin We write bootloader.bin to the floppy as such: dd if=bootloader.bin bs=512 count=1 of/dev/fd0 We write kernel.sys to the floppy as such: cp kernel.sys /dev/fd0 As I stated, this works in bochs. But booting from the floppy we get output like so: Loading Kernel Shell ........... ERROR : Press key to reboot Other specifics: OpenSUSE 11.2, GNOME desktop, AMD x64 Any other information I may have missed, feel free to ask. I tried to get everything in here that would be needed. If I need to, I can find a way to get the entire bootloader.asm posted somewhere. We are not really interested in using GRUB either for several reasons. This could change, but we want to see this boot successful before we really consider GRUB.

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• UITableView not getting populated

  - by jayshree430

  Hi. I have a peculiar problem. I created a normal Objective c class called SampleTable. I then extended UITableView instead of NSObject. Then in the initWithFrame constructor i initialized the table. I also made a NSMutableArray object for the datasource. I also conformed UITableViewDelegate and UITableViewDatasource. I have overridden the necessary methods also. Now i made an object of this class in another class, and added the object as a subview. The tableView is getting drawn according to the CGRectMake() coordinates i gave to the initWithFrame constructor. But it is not getting populated with the data. I dnt know what the problem is . Can plz someone help me. SampleTable.h #import @interface SampleTable : UITableView { NSMutableArray *ItemArray; } @property (nonatomic,retain) NSMutableArray *ItemArray; -(NSMutableArray *) displayItemArray; @end SampleTable.m #import "SampleTable.h" @implementation SampleTable @synthesize ItemArray; -(id)initWithFrame:(CGRect)frm { [super initWithFrame:frm]; self.delegate=self; self.dataSource=self; [self reloadData]; return self; } -(NSMutableArray *) displayItemArray { if(ItemArray==nil) { ItemArray=[[NSMutableArray alloc] initWithObjects:@"1",@"2",@"3",@"4",@"5",nil]; } return ItemArray; } (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [ItemArray count]; } (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell= [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell==nil) { cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier]; [cell autorelease]; } NSString *temp=[self.ItemArray objectAtIndex:indexPath.row]; cell.textLabel.text = temp; return cell; } (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { NSLog(@"didselect"); } -(void) dealloc { [ItemArray release]; [super dealloc]; } @end

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• When will the ValueConverter's Convert method be called in wpf

  - by sudarsanyes

  I have an ObservableCollection bound to a list box and a boolean property bound to a button. I then defined two converters, one that operates on the collection and the other operates on the boolean property. Whenever I modify the boolean property, the converter's Convert method is called, where as the same is not called if I modify the observable collection. What am I missing?? Snippets for your reference, xaml snipet, <Window.Resources> <local:WrapPanelWidthConverter x:Key="WrapPanelWidthConverter" /> <local:StateToColorConverter x:Key="StateToColorConverter" /> </Window.Resources> <StackPanel> <ListBox x:Name="NamesListBox" ItemsSource="{Binding Path=Names}"> <ListBox.ItemsPanel> <ItemsPanelTemplate> <WrapPanel x:Name="ItemWrapPanel" Width="500" Background="Gray"> <WrapPanel.RenderTransform> <TranslateTransform x:Name="WrapPanelTranslatation" X="0" /> </WrapPanel.RenderTransform> <WrapPanel.Triggers> <EventTrigger RoutedEvent="WrapPanel.Loaded"> <BeginStoryboard> <Storyboard> <DoubleAnimation Storyboard.TargetName="WrapPanelTranslatation" Storyboard.TargetProperty="X" To="{Binding Path=Names,Converter={StaticResource WrapPanelWidthConverter}}" From="525" Duration="0:0:2" RepeatBehavior="100" /> </Storyboard> </BeginStoryboard> </EventTrigger> </WrapPanel.Triggers> </WrapPanel> </ItemsPanelTemplate> </ListBox.ItemsPanel> <ListBox.ItemTemplate> <DataTemplate> <Grid> <Label Content="{Binding}" Width="50" Background="LightGray" /> </Grid> </DataTemplate> </ListBox.ItemTemplate> </ListBox> <Button Content="{Binding Path=State}" Background="{Binding Path=State, Converter={StaticResource StateToColorConverter}}" Width="100" Height="100" Click="Button_Click" /> </StackPanel> code behind snippet public class WrapPanelWidthConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { ObservableCollection<string> aNames = value as ObservableCollection<string>; return -(aNames.Count * 50); } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { throw new NotImplementedException(); } } public class StateToColorConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { bool aState = (bool)value; if (aState) return Brushes.Green; else return Brushes.Red; } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { throw new NotImplementedException(); } }

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