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• Return back to the parent activity from subactivity

  - by ZelluX

  My application supports twitter and needs to open browser for OAuth. When the user clicks the Share on Twitter button, the main activity will create another subactivity (TwitterActivity) to handle twitter authentication issues. Here is a flow graph showing how activities are invoked currently. Main is short for MainActivity and Twit for TwitterActivity. startActivity() OAuth intent OAuth callback finish() Main ---------------> Twit ------------> Browser --------------> Twit --------> Browser As you may notice, after the TwitterActivity calls finish() to stop, it will now return back to MainActivity, but Browser instead. How can I make it return back to MainActivity? Many thanks

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• Point data structure for a sketching application

  - by bebraw

  I am currently developing a little sketching application based on HTML5 Canvas element. There is one particular problem I haven't yet managed to find a proper solution for. The idea is that the user will be able to manipulate existing stroke data (points) quite freely. This includes pushing point data around (ie. magnet tool) and manipulating it at whim otherwise (ie. altering color). Note that the current brush engine is able to shade by taking existing stroke data in count. It's a quick and dirty solution as it just iterates the points in the current stroke and checks them against a distance rule. Now the problem is how to do this in a nice manner. It is extremely important to be able to perform efficient queries that return all points within given canvas coordinate and radius. Other features, such as space usage, should be secondary to this. I don't mind doing some extra processing between strokes while the user is not painting. Any pointers are welcome. :)

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• How can an animator do animation targeted for the iPhone

  - by teepusink

  Hi, I'm working with an animator for the iPhone. The animator I'm working with isn't a programmer and has a background in Flash. (right now she's doing the animation in Flash and I need to convert to Objective C). For some it's ok because I can just use image frames, but there are more complex animation that would take longer for me to convert to Objective C. Is there any tools out there that can help the work flow easier? Just trying to find a way so I can just take the animation and stick it into the project. Thanks, Tee

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• Box2dx: Cancel force on a body?

  - by Rosarch

  I'm doing pathfinding where I use force to push body to waypoints. However, once they get close enough to the waypoint, I want to cancel out the force. How can I do this? Do I need to maintain separately all the forces I've applied to the body in question? I'm using Box2dx (C#/XNA). Here is my attempt, but it doesn't work at all: internal PathProgressionStatus MoveAlongPath(PositionUpdater posUpdater) { Vector2 nextGoal = posUpdater.Goals.Peek(); Vector2 currPos = posUpdater.Model.Body.Position; float distanceToNextGoal = Vector2.Distance(currPos, nextGoal); bool isAtGoal = distanceToNextGoal < PROXIMITY_THRESHOLD; Vector2 forceToApply = new Vector2(); double angleToGoal = Math.Atan2(nextGoal.Y - currPos.Y, nextGoal.X - currPos.X); forceToApply.X = (float)Math.Cos(angleToGoal) * posUpdater.Speed; forceToApply.Y = (float)Math.Sin(angleToGoal) * posUpdater.Speed; float rotation = (float)(angleToGoal + Math.PI / 2); posUpdater.Model.Body.Rotation = rotation; if (!isAtGoal) { posUpdater.Model.Body.ApplyForce(forceToApply, posUpdater.Model.Body.Position); posUpdater.forcedTowardsGoal = true; } if (isAtGoal) { // how can the body be stopped? posUpdater.forcedTowardsGoal = false; //posUpdater.Model.Body.SetLinearVelocity(new Vector2(0, 0)); //posUpdater.Model.Body.ApplyForce(-forceToApply, posUpdater.Model.Body.GetPosition()); posUpdater.Goals.Dequeue(); if (posUpdater.Goals.Count == 0) { return PathProgressionStatus.COMPLETE; } } UPDATE If I do keep track of how much force I've applied, it fails to account for other forces that may act on it. I could use reflection and set _force to zero directly, but that feels dirty.

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• Develop an classic UI or be bold with a newer design?

  - by DeanMc

  Forgive me if this is the wrong place but I am curious as to how other programmers feel about this topic: I am currently working on my portfolio site, it is being designed and built in silverlight 4. I initially started off with a typical stylised e-folio theme much like a standard website in terms of layout and flow. As I work more in the concept stages something has struck me. Am I trying to shoe-horn yesterday into today? What I am talking about is UI expectations. I'm all for clean user interfaces but that does not mean they should not take advantage of new concepts in presentation right? If you where to develop a site in silverlight as your own portfolio piece would you stick to the tried and tested "website" feel or would you try to come up with a UI that is intuitive and complements the technology? I feel that UI discussions are all the more important now that all forms of web development are allowing better methods to engage the user.

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• C++: is it safe to work with std::vectors as if they were arrays?

  - by peoro

  I need to have a fixed-size array of elements and to call on them functions that require to know about how they're placed in memory, in particular: functions like glVertexPointer, that needs to know where the vertices are, how distant they are one from the other and so on. In my case vertices would be members of the elements to store. to get the index of an element within this array, I'd prefer to avoid having an index field within my elements, but would rather play with pointers arithmetic (ie: index of Element *x will be x - & array[0]) -- btw, this sounds dirty to me: is it good practice or should I do something else? Is it safe to use std::vector for this? Something makes me think that an std::array would be more appropriate but: Constructor and destructor for my structure will be rarely called: I don't mind about such overhead. I'm going to set the std::vector capacity to size I need (the size that would use for an std::array, thus won't take any overhead due to sporadic reallocation. I don't mind a little space overhead for std::vector's internal structure. I could use the ability to resize the vector (or better: to have a size chosen during setup), and I think there's no way to do this with std::array, since its size is a template parameter (that's too bad: I could do that even with an old C-like array, just dynamically allocating it on the heap). If std::vector is fine for my purpose I'd like to know into details if it will have some runtime overhead with respect to std::array (or to a plain C array): I know that it'll call the default constructor for any element once I increase its size (but I guess this won't cost anything if my data has got an empty default constructor?), same for destructor. Anything else?

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• Logging into oracle db as a global user

  - by kineas

  We are trying to shape up an old, 2 tier, Delphi based application. It originally uses database authentication, we'd like to transform the db user accounts to global users, so an OID server could perform the authentication instead of the database. The Delphi program can no longer log into the database if the account is a global user. I'm trying to understand the login protocol, so far without results. Similar thing happens with SQLDeveloper, I can't connect as a global user. SQLPlus however works with both kinds of users. We checked the information flow with Wireshark. When the dbserver asks back for a password, the SQLPlus sends it, while the SQLDeveloper doesn't send a password when attempting to connect as a global user. The client sends the application name too in the login request. Is it possible that we have to store the client app name in the LDAP itself?

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• Do the UI first with SketchFlow - Do I concern about the UI look?

  - by stacker

  There is no questions: UI-First Software Development. But what does it takes to do the UI first? I started to build a website, a complicated one, and know I start to concern about the UI. Instead to start coding html+css, I decided to start with SkecthFlow. now, I'm very confused. Do I want to build a exact sketch? meaning to think about colors, fonts make sure that the button will look like a web link... etc, or just build the application sketch flow? meaning put a textboxes and buttons. Do I need to implement every thing in SketchFlow first? I'm looking for best practice.

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• Extra < using auto complete in Sublime Text 2

  - by ReLeaf

  I installed the All Autocomplete package in my Sublime Text 2 editor and everything works fine except when I type "<div" or something similar, the auto-complete box pops up, I select the one I want and hit enter and it adds "<<div></div>" with an extra "<" in the front of my tag. I have to go back and delete the extra "<" every time...(!) I can't seem to resolve this issue. If I use the command CTRL+Space, the box pops up and I can select the tag I want and it does not include the extra tag but that messes with my flow. Has anyone out there experienced this? Thanks for your help!

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• seting ODBC Datasource in IBM AIX server

  - by adisembiring

  Hi ..... I have develop IBM Message broker flow database application in windows xp environment. the database accessed using ODBC datasource. basically, I use compute node with esql programming to select query in database, and I set the datasource in the compute node properties. Now want to deployed my project to AIX server. but, I dont know how to set ODBC datasource in AIX server. can you help me to how to set odbc in AIX server, can you help me to solve my problem ?? Thanks

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• Redundant code in exception handling

  - by Nicola Leoni

  Hi, I've a recurrent problem, I don't find an elegant solution to avoid the resource cleaning code duplication: resource allocation: try { f() } catch (...) { resource cleaning code; throw; } resource cleaning code; return rc; So, I know I can do a temporary class with cleaning up destructor, but I don't really like it because it breaks the code flow and I need to give the class the reference to the all stack vars to cleanup, the same problem with a function, and I don't figure out how does not exists an elegant solution to this recurring problem.

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• Gem::Install Error

  - by Tian

  When I try to cleanup my rails versions with sudo gem cleanup rails I get the following error: Cleaning up installed gems... Attempting to uninstall rails-2.3.5 Unable to uninstall rails-2.3.5: Gem::InstallError: cannot uninstall, check `gem list -d rails` Attempting to uninstall rails-1.2.6 Unable to uninstall rails-1.2.6: Gem::InstallError: cannot uninstall, check `gem list -d rails` gem list -d rails results in: rails (2.3.8, 2.3.5, 1.2.6) Author: David Heinemeier Hansson Rubyforge: http://rubyforge.org/projects/rails Homepage: http://www.rubyonrails.org Installed at (2.3.8): /Library/Ruby/Gems/1.8 (2.3.5): /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8 (1.2.6): /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8 Web-application framework with template engine, control-flow layer, and ORM. Any one know what's wrong?

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• googlemap zoom in iphone application

  - by Filthy Night

  Hi all, i have a problem in iphone application that i have integrated google map and i am calculating center runtime so that the map shows both points on the iphone screen, the alogrithm applied (thanks to stackover flow) is working fine in case of 2 locations very far from each other. But it is not working for near locations and the zoom level goes too much that it is not able to show any images of those two near locations, so i want to put a check that if the location are very near to each other OR the google is not able to show the maps of the locations then it choose the default zoom level so that it shows the map on the screen instead of blank / black screen. Thanks in advance

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• Return tiff file from outputstream on JSP

  - by YYY

  I am using a JSP to display a single TIFF file. The flow is as follows: I am given a PDF to convert to a TIFF. I feed a 'black box' API the PDF in the form of a File object and an OutputStream (I am currently using a ByteArrayOutputStream but that can change as needed. The 'black box' converts the PDF to a TIFF and saves the result to the OutputStream. I use out.println(outputstream) to spit out the TIFF. The problem is that I am getting a text stream instead of a displayed image. I have used the following head/meta tag: <head><title>PDF to TIFF tester</title> <META HTTP-EQUIV="Content-Script-Type" CONTENT="image/tiff"></head> <body> But that does not change the end result. Any help?

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• problem in interceptor executing before action in struts2

  - by vivmal

  Hi All, I am working on struts2. I have an interceptor that executes before my action claas. Now when I submit on a jsp page control goes to interceptor and after some processing there the control goes to action class. This complete flow is running well. But I found two things – 1) Control does not go to action-validation.xml before going to action class. 2) Its not getting the values of textfield or etc that uses has entered into jsp page before submitting. Can anyone tell me how to find solution for these two points. Thanks in advance.

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• How to know why an animation stutters?

  - by Patrick Klug

  I have a few fairly simple animations (moving text around, moving ellipses etc.) and running in full screen (1920x1080 minus the task bar) the WPF Performance Suite reports a good framerate around 50 FPS throughout the animation. Dirty Rect Addition is somewhere around 300 rect/s, the SW frames are between 0 and 4 and the HW frames are between 3 and 5. Video memory usage is around 80 MB. Problem is that the animations stutters every other half second. My machine is a new Dell laptop XPS 15 with the GeForce GT 435 with 2GB memory. - The drivers are up to date. (The same behavior occurs on my netbook (in full screen) as well so I don't think it is hardware related.) If I make the window smaller the stutter goes away. The stutter occurs with the simplest of animations - even with just a couple of elements but adding more elements certainly makes it more noticeable. How can I find out what causes this stutter? When I think of it, I have not actually seen any WPF animations which run smoothly in full screen. Is this even possible?

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• some OVERLAPS using WSASend not returning in a timely manner using GetQueuedCompletionStatus?

  - by Geoffrey

  Background: I'm using CreateIoCompletionPort, WSASend/Recv, and GetQueuedCompletionStatus to do overlapped socket io on my server. For flow control, when sending to the client, I only allow several WSASend() to be called when all pending OVERLAPs have popped off the IOCP. Problem: Recently, there are occassions when the OVERLAPs do not get returned to the IOCP. The thread calling GetQueuedCompletionStatus does not get them and they remain in my local pending queue. I've verified that the client DOES receive the data off the socket and the socket is connected. No errors were returned when the WSASend() calls were made. The OVERLAPs simply "never" come back without an external stimulus like the following: Disconnecting the socket from the client or server, immediately allows the GetQueuedCompletionStatus thread to retrieve the OVERLAPs Making additional calls to WSASend(), sometimes several are needed, before all the OVERLAPs suddenly pop off the queue. Question: Has anyone seen this type of behavior? Any ideas on what is causing this? Thanks, Geoffrey

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• Where to learn about HTTP?

  - by razass

  I am fluent in HTML and PHP and slowly learning JavaScript however I have noticed that there is a huge hole in my knowledge when it comes to understanding how web software communications actually work. I understand the flow of information across the net however I would like to learn about HTTP protocols to better understand how the data is actually sent back and forth through the internet to help me understand things like REST, HTTP Headers, AJAX requests, etc. However, I must be searching the wrong terms because I haven't been able to find a good description of HTTP protocols. Any help is appreciated to point me in the right direction. Thanks!

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• File descriptor limits and default stack sizes

  - by Charles

  Where I work we build and distribute a library and a couple complex programs built on that library. All code is written in C and is available on most 'standard' systems like Windows, Linux, Aix, Solaris, Darwin. I started in the QA department and while running tests recently I have been reminded several times that I need to remember to set the file descriptor limits and default stack sizes higher or bad things will happen. This is particularly the case with Solaris and now Darwin. Now this is very strange to me because I am a believer in 0 required environment fiddling to make a product work. So I am wondering if there are times where this sort of requirement is a necessary evil, or if we are doing something wrong. Edit: Great comments that describe the problem and a little background. However I do not believe I worded the question well enough. Currently, we require customers, and hence, us the testers, to set these limits before running our code. We do not do this programatically. And this is not a situation where they MIGHT run out, under normal load our programs WILL run out and seg fault. So rewording the question, is requiring the customer to change these ulimit values to run our software to be expected on some platforms, ie, Solaris, Aix, or are we as a company making it to difficult for these users to get going? Bounty: I added a bounty to hopefully get a little more information on what other companies are doing to manage these limits. Can you set these pragmatically? Should we? Should our programs even be hitting these limits or could this be a sign that things might be a bit messy under the covers? That is really what I want to know, as a perfectionist a seemingly dirty program really bugs me.

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• Class design when working with dataset

  - by MC

  If you have to retrieve data from a database and bring this dataset to the client, and then allow the user to manipulate the data in various ways before updating the database again, what is a good class design for this if the data tables will not have a 1:1 relationship with the class objects? Here are some I came up with: Just manipulate the DataSet itself on the client and then send it back to the database as is. This will work though obviously the code will be very dirty and not well-structured. Same as #1, but wrap the dataset code around classes. What I mean is that you may have a class that takes a dataset or a datatable in its constructor, and then provides public methods and properties to simplify the code. Inside these methods and properties it will be reading or manipulating the dataset. To update the database afterwards will be easy because you already have the updated dataset. Get rid of the dataset entirely on the client, convert to objects, then convert back to a dataset when needing to update the database. Is there any good resources where I can find information on this?

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• How to use keyword this in a mouse wrapper in right context in Javascript?

  - by MartyIX

  Hi, I'm trying to write a simple wrapper for mouse behaviour. This is my current code: function MouseWrapper() { this.mouseDown = 0; this.OnMouseDownEvent = null; this.OnMouseUpEvent = null; document.body.onmousedown = this.OnMouseDown; document.body.onmouseup = this.OnMouseUp; } MouseWrapper.prototype.Subscribe = function (eventName, fn) { // Subscribe a function to the event if (eventName == 'MouseDown') { this.OnMouseDownEvent = fn; } else if (eventName == 'MouseUp') { this.OnMouseUpEvent = fn; } else { alert('Subscribe: Unknown event.'); } } MouseWrapper.prototype.OnMouseDown = function () { this.mouseDown = 1; // Fire event $.dump(this.OnMouseDownEvent); if (this.OnMouseDownEvent != null) { alert('test'); this.OnMouseDownEvent(); } } MouseWrapper.prototype.OnMouseUp = function () { this.mouseDown = 0; // Fire event if (this.OnMouseUpEvent != null) { this.OnMouseUpEvent(); } } From what I gathered it seems that in MouseWrapper.prototype.OnMouseUp and MouseWrapper.prototype.OnMouseDown the keyword "this" doesn't mean current instance of MouseWrapper but something else. And it makes sense that it doesn't point to my instance but how to solve the problem? I want to solve the problem properly I don't want to use something dirty. My thinking: * use a singleton pattern (mouse is only one after all) * pass somehow my instance to OnMouseDown/Up - how? Thank you for help!

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• Efficient Clojure workflow?

  - by Alex B

  I am developing a pet project with Clojure, but wonder if I can speed up my workflow a bit. My current workflow (with Compojure) is: Start Swank with lein swank. Go to Emacs, connect with M-x slime-connect. Load all existing source files one by one. This also starts a Jetty server and an application. Write some code in REPL. When satisfied with experiments, write a full version of a construct I had in mind. Eval (C-c C-c) it. Switch REPL to namespace where this construct resides and test it. Switch to browser and reload browser tab with the affected page. Tweak the code, eval it, check in the browser. Repeat any of the above. There are a number of annoyances with it: I have to switch between Emacs and the browser (or browsers if I am testing things like templating with multiple browsers) all the time. Is there a common idiom to automate this? I used to have a JavaScript bit that reloads the page continuously, but it's of limited utility, obviously, when I have to interact with the page for more than a few seconds. My JVM instance becomes "dirty" when I experiment and write test functions. Basically namespaces become polluted, especially if I'm refactoring and moving the functions between namespaces. This can lead to symbol collisions and I need to restart Swank. Can I undef a symbol? I load all source files one by one (C-c C-k) upon restarting Swank. I suspect I'm doing it all wrong. Switching between the REPL and the file editor can be a bit irritating, especially when I have a lot of Emacs tabs open, alongside the browser(s). I'm looking for ways to improve the above points and the entire workflow in general, so I'd appreciate if you'd share yours. P. S. I have also used Vimclojure before, so Vimclojure-based workflows are welcome too.

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• FOR XML PATH Query results to file with SSIS

  - by whimsql

  In SSMS I've gotten my for xml path query written and it's beautiful. I put it in an "Execute SQL Task" in the Control Flow, set the resultset to XML. Now how to I get the results into an actual xml file that I can turn around and FTP to a third party? This should have been so easy! I would put the XML into a variable but we are looking at a HUGE file, possibly 100mb+ Do I need to use a Script Task? (I'd like to avoid that if there is another option.)

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• Which is faster when animating the UI: a Control or a Picture?

  - by Christopher Walker

  /I'm working with and testing on a computer that is built with the following: {1 GB RAM (now 1.5 GB), 1.7 GHz Intel Pentium Processor, ATI Mobility Radeon X600 GFX} I need scale / transform controls and make it flow smoothly. Currently I'm manipulating the size and location of a control every 24-33ms (30fps), ±3px. When I add a 'fade' effect to an image, it fades in and out smoothly, but it is only 25x25 px in size. The control is 450x75 px to 450x250 px in size. In 2D games such as Bejeweled 3, the sprites animate with no choppy animation. So as the title would suggest: which is easier/faster on the processor: animating a bitmap (rendering it to the parent control during animation) or animating the control it's self?

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• Is there a way to transfrom a list of key/value pairs into a data transfer object

  - by weevie

  ...apart from the obvious looping through the list and a dirty great case statement! I've turned over a few Linq queries in my head but nothing seems to get anywhere close. Here's the an example DTO if it helps: class ClientCompany { public string Title { get; private set; } public string Forenames { get; private set; } public string Surname { get; private set; } public string EmailAddress { get; private set; } public string TelephoneNumber { get; private set; } public string AlternativeTelephoneNumber { get; private set; } public string Address1 { get; private set; } public string Address2 { get; private set; } public string TownOrDistrict { get; private set; } public string CountyOrState { get; private set; } public string PostCode { get; private set; } } We have no control over the fact that we're getting the data in as KV pairs, I'm afraid.

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