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• Authenticate sites with different domain names using the Facebook API

  - by Onema

  We have a CMS that supports multiple sites, one of our features allows our users (The site admin) to connect to the site facebook account to allow status updates, create events and upload pictures to FB from with in the CMS. The authentication needs to occur once since each site may have multiple site admins that do not have access to the site FB user name and password. We use iframe and authenticate using $facebook-require_login() which redirects the user to the FB login and authentication pages. All this works just fine but when the user hits "Allow" the authentication will break as it will only redirect to whatever is in the "Post-Authorize Redirect URL" field making the app obsolete for any other domain except the one in the "Post-Authorize Redirect URL" I know other API's authentication methods like in Vimeo and YouTube will allow you to specify a NEXT parameter which is the equivalent of the "Post-Authorize Redirect URL" and it can be set at run time. How can I make this work for multiple domain names? Any hints on this issue will be of great help

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• Limit Connections with semaphores

  - by Robert

  I'm trying to limit the number of connections my server will accept using semaphores, but when running, my code doesn't seem to make this restriction - am I using the semaphore correctly? eg. I have hardcoded the number of permit as 2, but I can connect an unlimited number of clients... public class EServer implements Runnable { private ServerSocket serverSocket; private int numberofConnections = 0; private Semaphore sem = new Semaphore(2); private volatile boolean keepProcessing = true; public EServer(int port) throws IOException { serverSocket = new ServerSocket(port); } @Override public void run() { while (keepProcessing) { try { sem.acquire(); Socket socket = serverSocket.accept(); process(socket, getNextConnectionNumber()); } catch (Exception e) { } finally { sem.release(); } } closeIgnoringException(serverSocket); } private synchronized int getNextConnectionNumber() { return ++numberofConnections; } // processing related methods }

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• Visual Studio Editor, MEF in-Depth

  - by NewProgrammer

  I have been having difficulty simply writing a Visual Studio Editor Extension with MEF (Managed Extensiblity Framework). I thank those who answered my previous question, as they helped me know that I need to work with MEF. I've been trying to learn MEF for the Visual Studio Editor from MSDN's page, Extending the Editor, but it appears that I have a hard time understanding it. Can anyone provide strong resource or tutorials in addressing problem such as using the right ContentTypeDefintion (IGlyphFactory, TextMarkTag, etc...), and what is a ITagger. I need to understand these things, as most of the walkthrough only extending the text, such as only using the "spans" functionality, while I need to use "selection" methods and use MouseEventHandlers. Does anyone know an example similiar to my example, or references can tell me something about MEF's for VS editor in-depth?

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• CommunicationException in WCF

  - by user343159

  Hi I have a problem with a WCF Service I've just created. This was working yesterday but for some reason it's just stopped working. One of my WCF methods returns an array of an Entity Framework entity, like this: public BranchContactDetail[] GetClosestBranches(string postcode, int howManyBranches) { GeoLocation geoLocation = GetLocationFromPostcode(postcode); Location location = new Location(geoLocation.Latitude, geoLocation.Longitude); using (BranchDirectoryEntities entities = new BranchDirectoryEntities()) { var branchesInOrder = entities.BranchContactDetails .Where(b => b.latitude.HasValue && b.longitude.HasValue ) .OrderBy(b => location.DistanceFrom(b.latitude, b.longitude)) .Take(howManyBranches) .ToArray(); return branchesInOrder; } } ...and, as I say, this was working fine yesterday. Now I'm getting a "The underlying connection was closed: The connection was closed unexpectedly." I've hunted all over the web but no-one seems to know the answer. Anyone shed any light on this issue? Regards, Mark

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• python, wrapping class returning the average of the wrapped members

  - by João Portela

  The title isn't very clear but I'll try to explain. Having this class: class Wrapped(object): def method_a(self): # do some operations return n def method_b(self): # also do some operations return n I wan't to have a class that performs the same way as this one: class Wrapper(object): def __init__(self): self.ws = [Wrapped(1),Wrapped(2),Wrapped(3)] def method_a(self): results=[Wrapped.method_a(w) for w in self.ws] sum_ = sum(results,0.0) average = sum_/len(self.ws) return average def method_b(self): results=[Wrapped.method_b(w) for w in self.ws] sum_ = sum(results,0.0) average = sum_/len(self.ws) return average obviously this is not the actual problem at hand (it is not only two methods), and this code is also incomplete (only included the minimum to explain the problem). So, what i am looking for is a way to obtain this behavior. Meaning, whichever method is called in the wrapper class, call that method for all the Wrapped class objects and return the average of their results. Can it be done? how? Thanks in advance. ps-didn't know which tags to include...

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• Naming a typedef for a boost::shared_ptr<const Foo>

  - by Blair Zajac

  Silly question, but say you have class Foo: class Foo { public: typedef boost::shared_ptr<Foo> RcPtr; void non_const_method() {} void const_method() const {} }; Having a const Foo::RcPtr doesn't prevent non-const methods from being invoked on the class, the following will compile: #include <boost/shared_ptr.hpp> int main() { const Foo::RcPtr const_foo_ptr(new Foo); const_foo_ptr->non_const_method(); const_foo_ptr->const_method(); return 0; } But naming a typedef ConstRcPtr implies, to me, that the typedef would be typedef const boost::shared_ptr<Foo> ConstRcPtr; which is not what I'm interested in. An odder name, but maybe more accurate, is RcPtrConst: typedef boost::shared_ptr<const Foo> RcPtrConst; However, Googling for RcPtrConst gets zero hits, so people don't use this as a typedef name :) Does anyone have any other suggestions?

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• How to mask DLL in .NET ?

  - by ytrewq

  Let's say I have a DLL that provides math calculus functions. To use it, I include the using Colhq.Math.Basic; namespace. How could I use it by adding a statement like using Blala.Functions.Math; ? So how could I use everything (methods, enums, etc.) from a DLL by using a different namespace ? Is there a one-shot way to wrap or mask a DLL ?

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• Best way to access database from android

  - by Brandon Delany

  I am working on a Android app and I have a dilemma. I have a list of Objects. I have to update each of these objects with a database. I have 2 methods: Method 1: I can loop through the Objects. For each object I can connect to the server, update it, and then move on to the next Object, and so forth. Method 2: I can store the Objects in a list, send the whole list to the server, update it on the server side, then return a list of updated objects. My questions are: Which method is faster? Which method is easier on the phone's battery? By the way, Method 1 is easier for me to code :). Thank you.

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• Looking for how-to use UIGraphicsSetPDFContextURLForRect on iOS or Cocoa

  - by user1676332

  I'm playing to manipulate PDF on iOS (display but also and mostly generation). I wish to embed rectangular areas which act as "external" links (URLs like http://host.tld/path/file). Do you know where I can find an example(s) of how to use the UIGraphicsSetPDFContextURLForRect function? I find absolutly nothing on Internet. If I understand well, the only requirement is that the current graphic context should be PDF "type" and I think I respect this since, upstream, I call UIGraphicsPushContext why my PDF context as parameter (this was anyway required for methods like drawAtPoint: that I use also with success). I do not think it is important but just in case I specify that this DOES NOT take place in the drawRect: of a View subclass. You're quite right to say me unequivocally that I have "all wrong". The graphical environment is so sophisticated and rich in iOS that I assume to have not assimilated more than 1 or 2% for now. Thank you in advance.

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• [Iphone] - Problem in saving file using NSCoding

  - by Matte Gary

  Hi everybody, I've a problem with Iphone programming... I've a NSMutableArray containing object of type "MyClass". MyClass has some parameters, like NSNumber and NSString. I've followed the Apple Tutorial about coding and decoding object using NSCoding, but when I try to decode the file I've stored, the NSMutableArray contain object of type "MyClass", but with wrong parameters. I think i've done all I've to do (including protocol, including methods like initwithencode etc), but it's still not working... Any suggestions? Thanks a lot! And sorry for my English XD

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• lwjgl 101: How can I write applets?

  - by Vuntic

  I have a working app in lwjgl. It doesn't do much yet; I've just started, but it does compile and run like it's supposed to. I want to make it into an applet. I've followed the guide here, and I have an applet that runs nicely and displays text and such in the applet area and can access the functions of lwjgl (like Sys.alert), but I can't figure out how to get opengl to actually render. I've tried extending an AWTGLCanvas and calling this.add(myAWTGLCanvas), where this is the Applet that I'm using, but... nothing. The initGL() and paintGL() methods never get called. I wonder if I'm supposed to be doing something with Display, but that's not for applets, right? Help? Also: This counts as a "beginner" question, right? Edit: Here's a simplified version of what I have.

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• [wxWidgets] How to store wxImage into database, using C++?

  - by Thomas Matthews

  I have some wxImages and I would like to store them into a BLOB (Binary Large OBject) field in a MySQL database. There are no methods in wxImage nor wxBitmap for obtaining the binary data as an array of unsigned char so I can load into the database. My current workaround is to write the image to a temporary file, then load the BLOB field directly from the file. Is there a more efficient method to load and store a wxImage object into a MySQL BLOB field? I am using MySql C++ connector 1.05, MS Visual Studio 2008, wxWidgets and C++.

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• Difference between mutableArrayValueForKey and calling insertObject:inEmployeesAtIndex: directly

  - by jasonbogd

  I have a question regarding using KVO-compliant methods to insert/remove objects from an array. I'm working through Aaron Hillegass' Cocoa Programming for Mac OS X and I saw the following line of code (in the insertObject:inEmployeesAtIndex: method: [[undoManager prepareWithInvocationTarget:self] removeObjectFromEmployeesAtIndex:index]; Correct me if I'm wrong, but I always thought it was better to call mutableArrayValueForKey: and then removeObjectAtIndex:...so I tried changing the above line to this: [[undoManager prepareWithInvocationTarget:[self mutableArrayValueForKey:@"employees"]] removeObjectAtIndex:index]; And it didn't work. Can someone explain the difference and why the first line works but the second line doesn't?

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• Showing a Toast using "setUncaughtExceptionHandler"

  - by VitalyB

  Hi everyone, I'm trying to do a simple global exception handler in my Android app and I am having troubles: public class TicTacToe extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Thread.currentThread().setUncaughtExceptionHandler(new UncaughtExceptionHandler() { @Override public void uncaughtException(Thread thread, Throwable ex) { Toast.makeText(this, "TOAST", Toast.LENGTH_LONG); } }); setContentView(R.layout.main); } } I'm a rather new with both Android AND java but in .NET that would work. Can't I access local variable from anonymous methods in java? If so, how should I rewrite it? Thanks, Vitaly

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• Are there any differences between MSSQL and MySQL when it comes to preventing SQL injection?

  - by Derek Adair

  I am used to developing in PHP/MySQL and have no experience developing with MSSQL. I've skimmed over the PHP MSSQL documentation and it looks similar to MySQLi in some of the methods I read about. For example, with MySQL I utilize the function mysql_real_excape_string(). Is there a similar function with PHP/MSSQL? What steps do I need to take in order to protect against SQL injection with MSSQL? What are the differences between MSSQL and MySQL pertaining to SQL injection prevention?

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• How to monitor and maintain my grails application in live/production environment?

  - by fabien7474

  It is the first time I have ever launched live a website (with Grails web framework under Amazon EC2 platform and Cloud Foundry) and I realized quickly that I am not ready for monitoring and maintening correctly my application in production mode (fortunately the website is accessible to a very limited number of users) . The issues I have faced so far are: Cannot change my views. I need to redeploy my application I have no monitoring. I don't know who is connected, when do they sign in / sign out... Redploying my application (upload WAR + deploy) takes at least 30 minutes. I don't know how to restart my Tomcat server without a redeploy through Cloud Foundry ! ... So, my question is very simple: What tools (including grails plugins) and methods can you recommend me for taking me out from my current blindness?

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• TableAdapter to return ONLY selected columns? (VS2008)

  - by MattSlay

  (VS2008) I'm trying to configure a TableAdapter in a Typed DataSet to return only a certain subset of columns from the main schema of the table on which it is based, but it always returns the entire schema (all columns) with blank values in the columns I have omitted. The TableAdpater has the default Fill and GetData() methods that come from the wizard, which contain every column in the table, which is fine. I then added a new parameterized query method called GetActiveJobsByCustNo(CustNo), and I only included a few columns in the SQL query that I actually want to be in this table view. But, again, it returns all the columns in the master table schema, with empty values for the columns I omitted. The reason I am wanting this, is so I can just get a few columns back to use that table view with AutoGenerateColumns in an ASP.NET GridView. With it giving me back EVERY column i nthe schema, my presentation GridView contains way more columns that I want to show th user. And, I want to avoid have to declare the columns in the GridView.

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• Cocoa Touch - Display an Activity Indicator while loading a UITabBar View

  - by Aurum Aquila

  I have a UITabBar Application with two views that load large amounts of data from the web in their "viewWillAppear" methods. I want to show a progress bar or an activity indicator while this data is being retrieved, to make sure the user knows the app isn't frozen. I am aware that this has been asked before. I simply need some clarification on what seems to be a rather good solution. I have implimented the code in the example. The question's original asker later solved their problem, by putting the retrieval of data into another "thread". I understand the concept of threads, but I do not know how I would impliment this. With research, I have found that I need to move all of my heavy data retrieval into a background thread, as all of the UI updating occurs in the main thread. If one would be so kind as to provide an example for me, I would be very appreciative. I can provide parts of my existing code as necessary.

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• How to sift idioms and set phrases apart from other common phrases using NLP techniques?

  - by hippietrail

  What techniques exist that can tell the difference betwen plain common phrases such as "to the", "and the" and set phrases and idioms which have their own lexical meanings such as "pick up", "fall in love", "red herring", "dead end"? Are there techniques which are successful even without a dictionary, statistical methods HMMs train on large corpora for instance? Or are there heuristics such as ignoring or weighting down "promiscuous" words which can co-occur with just about any word versus words which occur either alone or in a specific limited set of idiomatic phrases? If there are such heuristics, how do we take into account set phrases and verbal phrases which do incorporate promiscuous words such as "up" in "beat up", "eat up", "sit up", "think up"? UPDATE I've found an interesting paper online: Unsupervised Type and Token Identi?cation of Idiomatic Expressions

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• Why would it be a bad idea to have database connection open between client requests?

  - by AspOnMyNet

  1) Book I’m reading argues that connections shouldn’t be opened between client requests, since they are a finite resource. I realize that max pool size can quickly be reached and thus any further attempts to open a connection will be queued until connection becomes available and for that reason it would be imperative that we release connection as soon as possible. But assuming all request will open connection to the same DB, then I’m not sure how having a connection open between two client requests would be any less efficient than having each request first acquiring a connection from connection pool and later returning that object to connection pool? 2) Book also recommends that when database code is encapsulated in a dedicated data access class, then method M opening a database connection should also close that connection. a) I assume one reason why M should also close it, is because if method M opening the connection doesn’t also close it, but instead this connection object is used inside several methods, then it’s more likely that a programmer will forget to close it. b) Are there any other reasons why a method opening the connection should also close it? thanx

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• Algorithms to trim leading zeroes from a SQL field?

  - by froadie

  I just came across the interesting problem of trying to trim the leading zeroes from a non-numeric field in SQL. (Since it can contain characters, it can't just be converted to a number and then back.) This is what we ended up using: SELECT REPLACE(LTRIM(REPLACE(fieldWithLeadingZeroes,'0',' ')),' ','0') It replaces the zeroes with spaces, left trims it, and then puts the zeroes back in. I thought this was a very clever and interesting way to do it, although not so readable if you've never come across it before. Are there any clearer ways to do this? Any more efficient ways to do this? Or any other ways to do this period? I was intrigued by this problem and would be interested to see any methods of getting around it.

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• How to automate configurating DotNetNuke settings for several environments?

  - by Joosh21

  Are there any recommended methods for automating configuring DotnetNuke settings? We will have several instances of our DNN application (prod, beta, qa, dev, local, etc) and need to be able to configure them all the same and be able to make updates to them all with our future releases. The settings currently needed to be configured include Host Settings, Portal Settings and User Profile Definitions. Here are some approaches I have come up with so far: 1) Create a Configuration module and use SQL scripts for all the settings? Is it generally safe to manipulate the DNN tables directly? Often it is recommended to use APIs with many frameworks. 2) Create a Configuration module and implement IUpgradeable.UpgradeModule and programatically set the settings? 3) Create a PortalTemplate from a portal with the settings all set. I believe this will only work for creating new portals. I will not be able to update existing portals.

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• Equivalent of describeType for Flex Component EVENTS

  - by Joshua

  Using "introspection" In Flex I can say: var classInfo:XML=describeType(SomeObject); Which will list for me the Accessors, Methods And Variables. (http://livedocs.adobe.com/flex/3/html/help.html?content=usingas_8.html) But what is the equivalent to programmatically inspect all of an object's possible EVENTS? (NOT JUST the events for which event listeners have been set, but to somehow step through a list of all VALID EVENTS for which event listeners may POTENTIALLY be set -- I realize that such lists are readily available online, and that's great for cases when I know the object's type at design type, but I require some way to inspect any given displayobject programmatically at runtime, and determine what events, if any, are or may be associated with it.)

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• Communication between Page and User Controls

  - by Narmatha Balasundaram

  I have a main page that has multiple user controls on it. All the user controls have static text and some data to be retrieved from the DB. The aysnchronous DB call is clubbed at the page level and one call is made to avoid multiple calls (in the different user controls) to get the same data. I want the page and user controls to load initially with the static text and later refresh the contents obtained from the server. To sum it all up, Page Loads = Asyn calls fired on page load = Data received back from the server (XML/text/whatever) = User controls to load with this data using AJAX. What methods do I have to let the user controls know that I have the data from the server and they need to update with this data?

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• Debugging runtime error "Terminating app due to uncaught exception 'NSInternalInconsistencyException

  - by Bill

  I'm going through the Beginning iPhone Development book & stuck in chapter 9. I've spent a few hours trying to debug this error w/o avail: 2010-05-01 19:27:51.361 Nav2[4113:20b] *** Assertion failure in -[UITableView _createPreparedCellForGlobalRow:withIndexPath:], /SourceCache/UIKit/UIKit-984.38/UITableView.m:4709 2010-05-01 19:27:51.362 Nav2[4113:20b] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UITableView dataSource must return a cell from tableView:cellForRowAtIndexPath:' 2010-05-01 19:27:51.364 Nav2[4113:20b] Stack: ( ... ) I'm not looking for help w/ the book, but tips for how to debug this error? Can I pin down which of my cellForRowAtIndexPath methods is the problem? And how to inspect the type? Or other things should I look at?

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