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• How to use UILongPressGestureRecognizer with sprite drag & wait?

  - by ganesh

  May be it's asked before also but I couldn't find any good answer. Please tell me how this can be implemented with UILongPressGestureRecognizer? A user drags a sprite from X location to Y location. Then it waits at Y location (touch is not ended yet) for 1 or 2 secs and release the touch i.e touch is ended. In this case, shouldn't following states be triggered in below order for UILongPressGestureRecognizer: UIGestureRecognizerStateBegan UIGestureRecognizerStateChanged UIGestureRecognizerStateEnded ? My problem is if UIPanGestureRecognizer is also implemented to handle drags, UILongPressGesture is never triggered even after Long waits. Any thoughts?

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• how to ask questions about bad practices in stackoverflow ( or other technical forums) [migrated]

  - by Nahum Litvin

  I had a case when I needed to do something in code that I knew is a bad practice. but because of a unique situation and after considering the risks thoroughly decided that is worth it. I cannot start explaining all my considerations that include buisness secrets over the internet but I do need technical assistance. when I tried to ask at SA I got heated responses why it is a bad practice instead of answeres to how to do this. poeple are so conserned about what is the right way to write code that they forget that there are other considerations as well. can anyone provide insight of how to correctly ask such a question in order to avoid "this is a bad practice" answers and get real answers?

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• Should all foreign table references use foreign key constraints

  - by TecBrat

  Closely related to: Foreign key restrictions -> yes or no? I asked a question on SO and it led me to ask this here. If I'm faced with a choice of having a circular reference or just not enforcing the restraint, which is the better choice? In my particular case I have customers and addresses. I want an address to have a reference to a customer and I want each customer to have a default billing address id and a default shipping address id. I might query for all addresses that have a certain customer ID or I might query for the address with the ID that matches the default shipping or billing address ids. I'm not sure yet how the constraints (or lack of) will effect the system as my application and it's data age.

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• How to give credit about an image I display in my website?

  - by Erel Segal Halevi

  I looked for an image for decorating the main page of my website. I found a great image in Wikipedia. The license allows me to use the image, but, I must give credit to the creators (which includes their name and a link to their Flickr page). My question is: what is the best way to give credit about the image, such that the page design will not be harmed? In case it matters: my page is very simple - it contains only the image (floated right), a heading, a small amount of text, and some links. But, my question is more general and probably applies to many different websites.

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• What are the cons of using DrawableGameComponent for every instance of a game object?

  - by Kensai

  I've read in many places that DrawableGameComponents should be saved for things like "levels" or some kind of managers instead of using them, for example, for characters or tiles (Like this guy says here). But I don't understand why this is so. I read this post and it made a lot of sense to me, but these are the minority. I usually wouldn't pay too much attention to things like these, but in this case I would like to know why the apparent majority believes this is not the way to go. Maybe I'm missing something.

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• What is constructor injection?

  - by TheSilverBullet

  I have been looking at the terms constructor injection and dependency injection while going through articles on (Service locator) design patterns. When I googled about constructor injection, I got unclear results, which prompted me to check in here. What is constructor injection? Is this a specific type of dependency injection? A canonical example would be a great help! Edit Revisiting this questions after a gap of a week, I can see how lost I was... Just in case anyone else pops in here, I will update the question body with a little learning of mine. Please do feel free to comment/correct. Constructor injection and property injection are two types of Dependency Injection.

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• How to configure permanent autologin?

  - by DanielGibbs

  I'm trying to set up an Ubuntu 12.04 machine as a kiosk and I would like it, on boot, to automatically log in as my kiosk user "kiosk", and start the appropriate display manager, in this case blackbox. I have configured /etc/lightdm/lightdm.conf as in this question and have an appropriate /usr/share/xsessions/blackbox.desktop to launch blackbox. I managed to get initial autologin by using the dbus-send method in this question, however if I right-click and select "Exit" from blackbox, then I am taken back to the login screen. How can I configure lightdm/ubuntu to always autologin as "kiosk" instead of displaying the login screen? Or, failing that, how can I configure blackbox to not display a menu when I right-click?

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• Windows Store is open for business!

  - by pluginbaby

  In case you didn’t know, you don’t have to wait for the launch of Windows 8 on October 26 to start building and deploying your apps. Developers from 120 markets (including Canada) can publish Windows Store apps right now! How to start ? Anyone with an MSDN Subscription, Dreamspark account (students) or BizSpark account (startups) get a 1-year Windows Store membership for FREE!! If you don’t have such account, an annual membership is only CAD $49 and lasts a full year. Just go to the Windows Store Dashboard on the Windows Dev Center and sign up. The dev tools are free and the SDK is ready.

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• Can I have a .desktop Launcher for both Python2 and Python3 depending on version installed?

  - by Takkat

  After very few issues only I moved my application from Python2 to Python3 making sure it will still run with Python 2.7, and hence has python = 2.7 as dependency only. This was mainly done because Python3, and some dependencies are not installed in a default 12.04 LTS, and I do not want my users to have to install all Python3 only to run my script. When I create an appname.desktop launcher I now need to decide if it starts my application using Python2, or Python3 like EXEC=python /path/app.py EXEC=python3 /path/app.py But what I would like it to do is to Launch the application with the Python3 interpreter if Python3 is installed. Otherwise use Python2 if Python3 is not installed. How can this be done? Do I need to tell it in my package installation script, or can I have a launcher which can handle both (in case people install Python3 after they had installed my script)?

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• Using Java classes in JRuby

  - by kerry

  I needed to do some reflection today so I fired up interactive JRuby (jirb) to inspect a jar.  Surprisingly, I couldn’t remember exactly how to use Java classes in JRuby.  So I did some searching on the internet and found this to be a common question with many answers.  So I figure I will document it here in case I forget how in the future. Add it’s folder to the load path, require it, then use it! $: << '/path/to/my/jars/' require 'myjar' # so we don't have to reference it absolutely every time (optional) include Java::com.goodercode my_object = SomeClass.new

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• OWSM vs. OEG - When to use which component - 11g

  - by Prakash Yamuna

  A lot of people both internal to Oracle and customers keep asking about when should OWSM be used vs. OEG. Sometime back I posted Oracle's vision for layered SOA security Here is a quick summary: Use OWSM in Green Zone Use OEG in Red Zone (DMZ) If you need end-to-end security in which case they will want both OWSM and OEG. This is the topology I would recommend for most customers. If you need only Green Zone security - then use OWSM in conjunction with Oracle FMW products like SOA Suite, OSB, ADF, WLS, BI, etc both on the Client Side and Service Side (assuming you are using FMW technologies for both Clients and Services). If you need only Red Zone security - then use OEG on the Service Side. You can use OWSM for the Client Side if you are using FMW to build your clients.

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• error of pdf2djvu: "Bogus memory allocation size"

  - by Tim

  I am using pdf2djvu to convert a pdf file into a djvu file, but got this error while trying to convert to either bundled or indirect multi-page djvu file: $ pdf2djvu 1.pdf -o 1.djvu 1.pdf: - page #1 -> #1 Bogus memory allocation size $ pdf2djvu 1.pdf -i 1.djvu 1.pdf: - page #1 -> #1 Bogus memory allocation size I was wondering what is wrong here and how I shall fix the problem? You can suggest another application other than pdf2djvu. My pdf file can be downloaded from here , in case that you may wonder what is special about it. Thanks and regards!

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• What should my "code sample" look like?

  - by thesunneversets

  I've just had quite a good phone interview (for a CakePHP-related position, not that it's especially important to the question). The interviewer seemed to be impressed with my resume and personality. At the end, though, he asked me to email him a code sample from my existing work project, "to check you're not secretly a terrible programmer, ha ha!" I'm not too worried that my code can't stand on its own two feet, but I'm very much an intermediate programmer rather than an expert. What obvious pitfalls should I make sure my code sample doesn't fall into, in case they rule me out on the spot? Secondly, and this is probably the harder part of the question to answer, what features in a code sample would be so impressive that they would instantly make you much more favourably inclined towards the programmer? All ideas or suggestions welcomed!

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• SANS Webcast: Label Based Access Controls in Oracle Database 11g

  - by Troy Kitch

  Controlling access to data subsets within an application table can be difficult and inefficient especially when faced with specific data ownership, consolidation and multi-tenancy requirements. However, this can be elegantly addressed using label based access control (LBAC). In this webcast you will learn how LBAC using Oracle Label Security and Oracle Database 11g can easily enforce row-level access based on user security clearance. In addition, Oracle security experts will discuss real world case studies demonstrating how customers, in industries ranging from retail to government, are relying on Oracle Label Security for virtual information partitioning and secure consolidation of information.  Register for the July 12 webcast now.

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• Removing existing filtered pages from Google's index: noindex / 301 / canonical to non-filtered page?

  - by Noam

  I've decided to remove some of my site's pages from the Google index to focus more of the indexed pages on higher quality pages. The pages I'm going to remove are already in the index. These removed pages are filtered pages which will continue to exist, I just don't want them in the google index because they add little quality to the same page without any filter selected. I've added in webmaster tools specification of narrow for the parameters that set these filters, but it doesn't seem this changes anything in how he handles these pages. So I'm considering three options: Adding <meta name="robots" content="noindex" /> to the html header of these filtered pages 301 to the non-filtered page that contains the most similar information and will remain in the index Canonical tag. Which I'm not sure is exactly the mainstream use case, as these aren't really the same pages. Which should I use?

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• Audio Panning using RtAudio

  - by user1801724

  I use the RtAudio library. I would like to implement an audio program where I can control the panning (e.g. shifting the sound from the left channel to the right channel). In my specific case, I use RtAudio in duplex mode (you can find an example here: duplex mode). It means that I link the microphone input to the speaker output. I have searched on the web, but I did not find anything useful. Should I apply a filter on the output buffer? What kind of filter?

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• Audio Panning using RtAudio

  - by user1801724

  I use Rtaudio library. I would like to implement an audio program where I can control the panning (e.g. shifting the sound from the left channel to the right channel). In my specific case, I use a duplex mode (you can find an example here: duplex mode). It means that I link the microphone input to the speaker output. I seek on the web, but I did not find anything useful. Should I apply a filter on the output buffer? What kind of filter? Can anyone help me? Thanks

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• AWR Performance Report and Read by Other Session Waits

  - by user702295

  For the questions regarding "read by other session" and its relation to "db file sequential/scattered read", the logic is like this: When a "db file sequential/scattered read" is done, the blocks are either already in the cache or on the disk.  Since any operation on blocks is done in the cache and since and the issue is "read by other session" I will relate to the case the blocks are on the disk. Process A is reading the needed block from the disk to the cache.  During that time, if process B (and C and others) need the same block, it will wait on "read by other session".  A and B can be threads of the same process running in parallel or unrelated processes.  For example two processes doing full table scan on mdp_matrix etc. Solutions for that can be lowering the number of processes competing on the same blocks, increasing PCTFREE.  If it is a full table scan, maybe an index is missing that can result in less blocks being read from the cache and so on.

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• Flattening a Jagged Array with LINQ

  - by PSteele

  Today I had to flatten a jagged array.  In my case, it was a string[][] and I needed to make sure every single string contained in that jagged array was set to something (non-null and non-empty).  LINQ made the flattening very easy.  In fact, I ended up making a generic version that I could use to flatten any type of jagged array (assuming it's a T[][]): private static IEnumerable<T> Flatten<T>(IEnumerable<T[]> data) { return from r in data from c in r select c; } Then, checking to make sure the data was valid, was easy: var flattened = Flatten(data); bool isValid = !flattened.Any(s => String.IsNullOrEmpty(s)); You could even use method grouping and reduce the validation to: bool isValid = !flattened.Any(String.IsNullOrEmpty); Technorati Tags: .NET,LINQ,Jagged Array

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• Calculating instantaneous speed and acceleration for a simple Car software model

  - by Dylan

  I am trying to model a speedometer and tachometer for a simple software model of a car dashboard. I want this to be relatively simple, so for my purposes I won't likely simulate variables such as drag (or, assume that drag is a constant). But I would like to know the general formulas for: 1) Calculating the RPM, depending on a position of a graphical slider representing the accelerator. 2) Using this information to find the instantaneous speed (or, magnitude of instantaneous velocity?). I am not sure, in the case of 2), what other independent variables I need to consider. Do I need to consider the frequency of rotation of the wheels (assuming a fixed radius), in addition to the RPM? If anyone can give me a rough explanation plus relevant formulas, or alternatively direct me to other trusted resources online (I have had a hard time sifting through info and determining the accuracy), it would be much appreciated.

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• Anisotropic and trilinear filtering?

  - by fedab

  I'm confused about the usage of trilinear filtering and anisotropic filtering in SharpDX. As far as i understood, trilinear filtering does linear filtering to the textures and in a case of LOD-change it also interpolates between the too LODs to smooth the transition. Anisotropic filtering make the texture bigger. Now it is possible to use trilinear filtering to do the same thing, due to anisotropic filtering with bigger textures. This causes a lesser blurred image, when you use anisotropy, because the interpolation is better. Now, it should be possible to use trilinear filtering and anisotropic filtering at the same time. But in the SamplerState i can only choose Filter.Anisotropy or Filter.MinMagMipLinear (should be trilinear, right?). You can see all possible filters here: D3D11 Filter Enumeration. So my question: Can you use both techniques together, if yes, how can i archieve that in SharpDX with SamplerState?

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• What does "context-free" mean in the term "context-free grammar"?

  - by rick

  Given the amount of material that tries to explain what a context-free grammar (CFG) is, I found it surprising that very few (in my sample, less than 1 in 20) give an explanation on why such grammars are called "context-free". And, to my mind, none succeeds in doing so. My question is, why are context-free grammars called context-free? What is "the context"? I had an intuition that the context could be other language constructs surrounding the currently analyzed construct, but that seems not to be the case. Could anyone provide a precise explanation?

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• Does a prose to code compiler exist?

  - by Raynos

  I have seen some horrible code in my time including people virtually duplicating the code in comments // add 4 to x x+=4; // for each i in 0 to 9 for (int i = 0; i < 10; i++) { // multiply x by i x *= i; } Taking this concept further, I'm curious whether prose to code compilers exist. Is there a valid use case for English prose to code? Do compilers exist that do this? The distinction between this and auto generated code, is that auto generated code is generally always a subset of a project. Can we have complete projects auto generated from english prose? I realise that this might overlap with the concept of declarative languages.

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• Need Help Unable to Mount Location

  - by Don't ASk Ubun

  I am not able to start Windows and am using a DVD copy of Ubuntu to start up. I see my 750 GB Hard Disk, but if I click it i get this error: Error mounting: mount exited with exit code 13: ntfs_attr_pread_i: ntfs_pread failed: Input/output error Failed to read NTFS $Bitmap: Input/output error NTFS is either inconsistent, or there is a hardware fault, or it's a SoftRAID/FakeRAID hardware. In the first case run chkdsk /f on Windows then reboot into Windows twice. The usage of the /f parameter is very important! If the device is a SoftRAID/FakeRAID then first activate it and mount a different device under the /dev/mapper/ directory, (e.g. /dev/mapper/nvidia_eahaabcc1). Please see the 'dmraid' documentation for more details. After googling for a while I think I need to do sudo apt-get install ntfsprogs but when I try that: E: Package 'ntfsprogs' has no installation candidate My problem is a lot like this thread

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• SAP Applications Run Better on Oracle Exadata

  - by jgelhaus

  To yield the results necessary to stay competitive, your business-critical applications must be able to access the most reliable and up-to-date information. That’s why a growing number of SAP application customers are turning to Oracle Exadata Database Machine for better performance, better productivity—and big savings. Watch our latest Webcast to find out why Oracle Exadata is the ideal platform for running your SAP applications. You’ll learn how you can: Increase the performance of SAP applications Enhance reliability with a centralized, scalable platform Ensure quick, safe, and easy deployments Watch it now. Highlights include customer case studies and practical deployment strategies. Watch our latest on-demand Webcast to find out why Oracle Exadata is the ideal platform for running your SAP applications. Learn how to increase the performance of SAP applications, enhance reliability with a centralized, scalable platform and ensure quick, safe and easy deployments.

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