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  • Generic Data Structure Description Language

    - by Jon Purdy
    I am wondering whether there exists any declarative language for arbitrarily describing the format and semantics of a data structure, that can be compiled to a specific implementation of that structure in any of a set of target languages. That is, something like a generic data definition language but geared toward describing arbitrary data structures such as vectors, lists, trees, etc., and the semantics of operations on those structures. I ask because I had an idea for a feasible implementation of this concept, and I'm just wondering whether it's worth it, and, consequently, whether it's been done before. Another, slightly more abstract question: is there any real difference between the normative specification of a data structure (what it does) and its implementation (how it does it)?

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  • Adobe AIR: touch screen doesn't trigger mouse down event correctly

    - by Saariko
    i have designed a gaming kiosk app in as3 i am using it on a Sony vaio l pc (like hp's touchsmarts) in windows 7 the app doesn't need any multi-touch gestures (only single touch clicks and drags) so i am using mouse events everything is fine (including mouse click and move events) except that a single touch to the screen (with no move) doesn't fire a mouse down. it is fired only after a small move of the finger outside the app, on my desktop, i see that the small windows 7 cursor jumps immediately to where a finger is placed, meaning this issue isn't a hardware or a windows problem but rather how internally the flash app receives "translated" touch-to-mouse events from the os. for example, in a windows Solitaire game, a simple touch to the screen immediately highlights the touched card. in my app, a button will change to the down state only if i touch it and also move my finger slightly (click events - down and up - are triggered fine) shouldn't the MOUSE_DOWN event trigger exactly like how a TOUCH_BEGIN would in the new touchevent class? any ideas?

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  • WPF command/click argument

    - by Joel Barsotti
    So I have a background in ASP.NET where a button could have a click handler or a command handler and then a command argument. That pattern was great for when you had a bunch of buttons that basically needed to execute the same block of code with only a slightly different argument. Is there a collary in WPF? From what I've seen of the Command in WPF is that it revolves around an action that is independent of the control that invokes it (and still doesn't provide a way to provide an argument). Which is not really what I need.

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  • Visual Studio HTML Cursor-within-HTML-Element Syntax-highlighting color

    - by David Murdoch
    I can't, for the life of me, figure out how to change grey highlight color in the screenshot below to something that will make the text a little more legible. Does anyone know what the "Display Item" name is that I need to change? To get to the "theme editor" select Tools = Options = Environment = Fonts and Colors. I can't find what to edit. I've also looked through Tools = Options = Text Editor = HTML = Formatting to no avail. In case you are wondering the theme is a slightly modified Coding Instinct Theme

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  • Google Map GEO Results

    - by Lee
    Hey All I'm getting really frustrated with google geo results and hope someone can advise me the best was to go. I have created a AutoSuggest feature where you can start typing the address and google will repspond with suggestions. User then selects and address to move on. But before I want them to continue on the next page I want to validate their selection. I would have thought this will be easy as we are only checking against what google has already given. But when I do my validation lookup it displays no results. Some example code: Lets say I picked from the suggestion this address: Suffield, CT 06078, USA Then on validation I do a second lookup with this address ie. $string = "Suffield, CT 06078, USA"; echo 'http://maps.google.com/maps/geo?output=json&oe=utf8&gl=us&sensor=false&key=[MyKey]&q='.urlencode($string).''; It gives me Error code 602 (G_GEO_UNKNOWN_ADDRESS) How can it not be found when its given me the address ?? Any suggestions how I can get around this. Hope you can !

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  • A definitive guide to Url Encoding in ASP .NET

    - by cbp
    I am starting to realise that there are about a bazillion different methods for encoding urls in .NET. I keep finding new ones. They all work slightly differently, but they all have essentially the same summary comments. Does anyone have a definitive matrix that shows the exact differences between the following methods: HttpUtility.UrlEncode HttpUtility.UrlPathEncode Server.UrlEncode Uri.EscapeUriString Uri.EscapeDataString ... are they any more? Also it would be good to match these up with use-cases e.g.: Urls in href attributes of a tags Urls to be displayed to the user in HTML Urls as querystring values (i.e. to be sent in GET requests) Urls to be sent in POST requests etc

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  • SQL 2008 Database tuning advisor won't start

    - by Andrew Hancox
    For some reason I can't get DTA to connect to my development machine. It connects to a remote DB just fine but when I point it to my dev machine I get an error saying: Failed to initialize MSDB database for tuning (exit code: -1073741819). I'm pretty sure it's not a permissions issue since I've used profiler to capture what it's doing and all of the commands it's run so far look fine and are being run under my account which is associated with the sysadmin role, when I run them in sql management studio they go through fine. I'm pretty convinced that the problem is related to creating the objects in MSDB that are used by DTA but I tried creating these manually (I found scripts on the web) and it just seems to push the problem along the line slightly. I'm going out of my mind - have even tried reinstalling SQL but that's not fixed it. I'm using SQL 2008 with SP1 (10.0.2531) on windows server 2008 (patched up to date). SAVE ME!!!!!

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  • [Cocoa] CoreData bindings for NSPopupButton

    - by ndg
    I'm looking to use a dropdown menu (possibly an NSPopupButton object) to represent the hierarchical results of two Core Data entities (Genre and Movie) and their relationships. In my current data model, my Genre entity has a one-to-many relationship with my Movie entity. What I'm now looking to do is generate the contents of an NSPopupButton to show a hierarchical list of Genres and the Movies associated with them, like so: Genre 1 Film 1 Film 2 Genre 2 Film 3 Film 4 Note that, in the above example, only Movie objects are to be selectable by the user (Genre objects will appear, but be unselectable). Also, to complicate matters slightly, I have an additional NSPopupButton which lists Movie Rental locations. The location selected by the user ultimately impacts on the genres and films available in the second dropdown. I imagine that bindings will only take me so far with this problem and that, ultimately, I'll have to populate the contents of the dropdown menu myself. I'm posting here for thoughts and opinions on the best way to go about this.

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  • Does HDC use alpha channel?

    - by Crend King
    Hello. Is there a way I can determine if an HDC uses alpha channel? I read Question 333559 and Question 685684, but their questions are about BITMAP. Apparently, some HDC has alpha channel (though they may not use it. Call this "Type 1") while others do not ("Type 2"). I know this by doing the following: Given a HDC, Create a compatible DC, and create a DIB section. Select the created HBITMAP into the compatible DC. BitBlt the source HDC to the compatible DC. Now examine the DIB section bits. For type 2 HDC, after every 3 bytes there is a byte always 0 (like 255 255 255 0); for type 1, these bytes are usualy 255 (like 250 240 230 255). To avoid false positive, I memset the bits to all 0x80 prior to the calls. Use GetDIBits directly on the source HDC, specify the HBITMAP as GetCurrentObject(hdc, OBJ_BITMAP). For both types of HDC, the 4th bytes are always 0. Change the DC bitmap by calling ExtTextOut. For type 2, ExtTextOut always set the 4th bytes to 0. For type 1, ExtTextOut always leave them untouched. I also noticed that the source HDC that are created by APIs (CreateCompatibleDC(), BeginPaint() ...) are always type 2. Type 1 HDC are from standard controls (like menu text). Even the HDC I CreateCompatibleDC from a type 1 becomes a type 2. So, on one hand, I'm frustrated that Microsoft does not provide equal information to developers (another example may be that you cannot know the direction of a HBITMAP after it is created), on the other hand, I'm still wondering is there a way to distinguish these HDC. Thanks for help.

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  • How to retrive only one cell from MySQL table with PHP

    - by JuanCee
    I'm trying to create a forgotten password form that emails users their password. I'm having a problem, though, with the actual password part. You see, I have the email and comparing the email correct, except whenever I send the email I always get either "Your password is ." or "Your password is Array". I'm using: $check_email = mysql_num_rows(mysql_query("SELECT email FROM userRecovery WHERE email = '$to'")); if($check_email == 1){ $qtip = mysql_query("SELECT password FROM userRecovery WHERE email = '$to'"); $theirPassword = mysql_fetch_array($qtip); Rest of the Code... } I used to be able to do this correctly, but I haven't done PHP or MySQL in too long so it's slightly annoying (that, and I'm at a beginner-intermediate kind of level). I remember having this exact problem, but I don't have the code with me to find out what I did. If you think I left out a detail, please say so. Any help if appreciated.

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  • Scrolling when idle?

    - by Julie
    Can anyone point me to an example of code for a page that begins to automatically scroll when the user is idle for an amount of time? I think this is slightly beyond my skill set. I think JQuery or something similar might be appropriate but I just can't seem to figure it out. I'm designing a site for the nonprofit I work for and we don't have the money to hire a programmer. I wouldn't ask anyone to code anything for me, just to point me in the right direction. Thank you so much. Julie K.

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  • Scala: How to combine parser combinators from different objects

    - by eed3si9n
    Given a family of objects that implement parser combinators, how do I combine the parsers? Since Parsers.Parser is an inner class, and in Scala inner classes are bound to the outer object, the story becomes slightly complicated. Here's an example that attempts to combine two parsers from different objects. import scala.util.parsing.combinator._ class BinaryParser extends JavaTokenParsers { def anyrep: Parser[Any] = rep(any) def any: Parser[Any] = zero | one def zero: Parser[Any] = "0" def one: Parser[Any] = "1" } object LongChainParser extends BinaryParser { def parser1: Parser[Any] = zero~zero~one~one } object ShortChainParser extends BinaryParser { def parser2: Parser[Any] = zero~zero } object ExampleParser extends BinaryParser { def parser: Parser[Any] = (LongChainParser.parser1 ||| ShortChainParser.parser2) ~ anyrep def main(args: Array[String]) { println(parseAll(parser, args(0) )) } } This results to the following error: <console>:11: error: type mismatch; found : ShortChainParser.Parser[Any] required: LongChainParser.Parser[?] def parser: Parser[Any] = (LongChainParser.parser1 ||| ShortChainParser.parser2) ~ anyrep I've found the solution to this problem already, but since it was brought up recently on scala-user ML (Problem injecting one parser into another), it's probably worth putting it here too.

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  • MessageBox doesn't show on mdi form after a long calculation

    - by Rekreativc
    Hello This is a very similar problem to This one, sadly that one was never answered either. I have a MDI Main forum that hosts several children forms. One of them does a long calculation and throws an exception if an error occurs (all work is done on the same thread). I then try to inform the user of an error with an messagebox, however it doesn't appear (but steals focus from the MDI Main, so the application is completely unresponsive). The beheviour changes slightly if I call Application.DoEvents() (evil I know, but this is a last resort thing). Then the forms remain completely active and the messagebox only appears after I change active application (Alt+Tab) to something else and then back again. What can I do to make sure the messagebox will be visible? I have already tried passing both, active child and MDI Main as parameter to the MessageBox.Show method. It doesn't change the behaviour.

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  • Error CS0117: Namespace.A does not contain definition for Interface..

    - by SnOrfus
    I'm getting the error: 'Namespace.A' does not contain a definition for 'MyObjectInterface' and no extension method 'MyObjectInterface' accepting a first argument of type ... I've looked at this and this and neither seems to apply. The code looks like: public abstract class Base { public IObject MyObjectInterface { get; set; } } public class A : Base { /**/ } public class Implementation { public void Method() { Base obj = new A(); obj.MyObjectInterface = /* something */; // Error here } } IObject is defined in a separate assembly, but: IObject is in a separate assembly/namespace Base and A are in the same assembly/namespace each with correct using directives Implementation is in a third separate assembly namespace, also with correct using directives. Casting to A before trying to set MyObjectInterface doesn't work Specifically, I'm trying to set the value of MyObjectInterface to a mock object (though, I created a fake instead to no avail) I've tried everything I can think of. Please help before I lose more hair. edit I can't reproduce the error by creating a test app either, which is why I'm here and why I'm frustrated. @Reed Copsey: /* something */ is either an NUnit.DynamicMock(IMailer).MockInstance or a Fake object I created that inherits from IObject and just returns canned values. @Preet Sangha: I checked and no other assembly that is referenced has a definition for an IObject (specifically, it's called an IMailer). Thing is that intellisense picks up the Property, but when I compile, I get CS0117. I can even 'Go To Definition' in the implementation, and it takes me to where I defined it.

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  • WPF Two Commands handlers, One Command

    - by Aran Mulholland
    Im deriving from a third party control. It is implementing ApplicationCommands.SelectAll. However the behaviour i want is slightly different. there is no virtual method i can override, and when i register a class handler, like so CommandManager.RegisterClassCommandBinding(typeof(MyDerivedControl), new CommandBinding(ApplicationCommands.SelectAll, new ExecutedRoutedEventHandler(OnExecutedSelectAll), new CanExecuteRoutedEventHandler(OnCanExecuteSelectAll))); My methods do not get called. The third party control i am deriving from is marking e.Handled=true; in its command handlers ( i know this cause i have seen the source, but i cant modify it ) What can i do?

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  • zxing project on android

    - by Aisthesis Cronos
    Hello everybody Many weeks ago,I tried to work on a mini project on Android OS requires ZXING, I followed several tutorials on this web site and on other Example: tuto1, and many tags and tutorials here tuto2, tuto3 ... But I failed each time. I can't import the android project into eclipse IDE to compile it with my code "not via Intent zxing APK-and my program like this example : private Button.OnClickListener btScanListener = new Button.OnClickListener() { public void onClick(View v) { Intent intent = new Intent("com.google.zxing.client.android.SCAN"); intent.putExtra("SCAN_MODE", "QR_CODE_MODE"); try { startActivityForResult(intent, REQUEST_SCAN); } catch (ActivityNotFoundException e) { Toast.makeText(Main.this, "Barcode Scanner not intaled ", 2000).show(); } } }; public void onActivityResult(int reqCode, int resCode, Intent intent) { if (REQUEST_SCAN == reqCode) { if (RESULT_OK == resCode) { String contents = intent.getStringExtra("SCAN_RESULT"); Toast.makeText(this, "Succès : " + contents, 2000).show(); } else if (RESULT_CANCELED == resCode) { Toast.makeText(this, "Scan annulé", 2000).show(); } } }` ". I feel disappointed, frustrated and sad. I still have errors after importing the project. I tried both versions 1.5 and 1.6 zxing I tried to import the project c: \ ZXing-1.6 \ android, and an other new project with c: \ ZXing-1.6 \ zxing-1.6 \ android,I cheked out SVN: ttp: / / zxing.googlecode.com / svn / trunk / zxing-read-only with tortoiseSVN and reproduce the same work, but unfortunately without results! I really fed up with myself ... Please help me to solve this problem.how can I import the project and compile it correctly in my own project? 1 - I use Windows 7 64-bit Home Premium 2 - Eclipse IDE for Java EE Web Developers. Version: Helios Service Release 2 Build id: 20110218-0911 What is the effective and sure method to run this, otherwise if there is a video or a guide details or someone who already done it previously I would really appreciate it if someone would help me out

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  • Getting EXC_BAD_ACCESS without any helpful msg from NSZombieEnabled

    - by nefsu
    Hello guys. I'm a newbie to iphone development and I've been struggling with an EXC_BAD_ACCESS error I got a couple of days ago. I'm basically taking the Stanford iphone class independently and I am trying to pass an array of NSManagedObjects to a TableViewController that's supposed to display them. The application launches in the simulator and displays the data in the tableView but it immediately errors out with an EXC_BAD_ACCESS. I followed instructions here and other places on how to use NSZombieEnabled to identify prematurely released objects but this one comes without any helpful msgs even with NSZombieEnabled. My guess is it must be caused by something trying to access unassigned memory that wasn't released through release/autorelease. Or else it would have been picked up as zombie object like the other errors I have been able to fix. I'm not a c expert but does that mean something like that could happen if I were to declare an object and send it a message without ever instantiating it? I looked through my code to see if I had anything like that and I came up empty. I have the stack trace in the debugger for this but I'm not sure how to make use of it. I'm a little frustrated because I can't use breakpoints in the code to narrow down the problem any further since it seems to happen after the app has finished loading. I thought the app would just stay idle if there was no possible user interaction. Is it failing at the tail end of the load where I can't easy see it or is jut doing stuff in the background after it's done loading. And I would much appreciate any tips on how to read the stacktrace for this. Thanks for the help guys.

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  • producing pixel-identical images of text between Sun Java and OpenJDK

    - by yuvi
    My release script produces images of the version number to save me the trouble of manually going into the MoinMoin wiki software and changing it by hand for each release. Unfortunately, since the fonts look a little different on each platform's JVM, the result is ugly. I solved the the font inconsistency by using Lucide Sans (comes with every Java system). (Loading Fonts from TTF files was another option, but was buggy on Mac Java). The result is much better, producing the exact same image on Mac/Windows (), but a slightly different one on OpenJDK (). I believe this is caused by OpenJDK having a different font rendering system (as opposed to different fonts). Is there any way I can get all three of my target platforms (Sun Windows, Mac, OpenJDK Linux) to produce images of text that look identical?

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  • Criteria to Evaluate Business Rules Engines

    - by flybywire
    We are shopping for Business Rules Engines. We want to make our core application customizable to different customers with slightly different requirements. The people who would actually do the customizations are analysts. I.e. non-programmers who are technically skilled (usually have a degree in sciences). What are the criteria to evaluate business rules engines? Are there open source and comercial ones? What are your experiences in ease of use, documentation, support, price, etc. Our app is in Java.

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  • iPad Orientation Paradigm

    - by JustinXXVII
    I'm not a super awesome designer so this new paradigm has me a little cranky. The iPad is not supposed to have a standard orientation, and should/shall display screen contents at whichever orientation the user decides. This has me sort of stumped. I can keep my UI designed the way I want it in landscape mode, but switching to portrait, I just can't determine the best way to present app content. I know it's all speculation at this point, but what are the chances we can override the autoRotateToOrientation to only include the orientation of our choice? Apple ignored the HIG on a lot of issues for iPhone, including splash screens, saving state, etc. I know we can't really argue with Apple, but doesn't it sound slightly ridiculous to reject an app because it won't rotate to portrait? I've come a long way porting some code to iPad and it works great in landscape mode. I guess only time will tell. What do you all think?

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  • MacPorts on Snow Leopard: Python install seems to succeed but doesn't install a non-system Python

    - by thebossman
    I've installed Python via MacPorts. According to this question, the files in /opt/local/bin should run the "correct" Python version. However, all those files are symlinks to: /opt/local/Library/Frameworks/Python.framework/Versions/2.6/bin/ Running them directly from that folder (using no symlinks) runs an Apple build of Python! Python 2.6.6 (r266:84292, Jan 6 2011, 13:25:25) [GCC 4.2.1 (Apple Inc. build 5664)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> For comparison, running /usr/bin/python shows a slightly different version: Python 2.6.1 (r261:67515, Jun 24 2010, 21:47:49) [GCC 4.2.1 (Apple Inc. build 5646)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> They're both Apple builds! How do I install the correct version?

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  • What does the status code of the Perl interpreter mean?

    - by futureelite7
    Hi, This might sound slightly confusing, but please bear with me. I'm trying to execute a copy of the Perl interpreter using Java's Runtime.exec(). However, it returned error code 9. After running the file a few times, the perl interpreter mysteriously started to return code 253 with no changes in my command at all. What does code 253 / code 9 mean? A google search for perl interpreter's exit codes turned up nothing. Where can I find a list of exit codes for the Perl interpreter? Thanks!

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  • Mapping of memory addresses to physical modules in Windows XP

    - by Josef Grahn
    I plan to run 32-bit Windows XP on a workstation with dual processors, based on Intel's Nehalem microarchitecture, and triple channel RAM. Even though XP is limited to 4 GB of RAM, my understanding is that it will function with more than 4 GB installed, but will only expose 4 GB (or slightly less). My question is: Assuming that 6 GB of RAM is installed in six 1 GB modules, which physical 4 GB will Windows actually map into its address space? In particular: Will it use all six 1 GB modules, taking advantage of all memory channels? (My guess is yes, and that the mapping to individual modules within a group happens in hardware.) Will it map 2 GB of address space to each of the two NUMA nodes (as each processor has it's own memory interface), or will one processor get fast access to 3 GB of RAM, while the other only has 1 GB? Thanks!

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  • as3 - controlling flicker when scaling up a button or movieclip

    - by sol
    This is a situation I run into a lot but never seem to find a good solution. I have movieclips that I scale up slightly on rollover, but if you hover over the edge of the movieclip it just sits there and flickers, continuously receiving mouseOver and mouseOut events. How do you deal with this? Again, it's usually a problem when tweening the scale of a movieclip or button. my_mc.addEventListener(MouseEvent.MOUSE_OVER, mOver); my_mc.addEventListener(MouseEvent.MOUSE_OUT, mOut); private function mOver(m:MouseEvent) { TweenLite.to(m.target, .2, { scaleX:1.1, scaleY:1.1} ); } private function mOut(m:MouseEvent) { TweenLite.to(m.target, .2, { scaleX:1, scaleY:1} ); }

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  • What is the recommended toolchain for formatting XML DocBook?

    - by Jonathan Leffler
    I've seen Best tools for working with DocBook XML documents, but my question is slightly different. Which is the currently recommended formatting toolchain - as opposed to editing tool - for XML DocBook? In Eric Raymond's 'The Art of Unix Programming' from 2003 (an excellent book!), the suggestion is XML-FO (XML Formatting Objects), but I've since seen suggestions here that indicated that XML-FO is no longer under development (though I can no longer find that question on StackOverflow, so maybe it was erroneous). Assume I'm primarily interested in Unix/Linux (including MacOS X), but I wouldn't automatically ignore Windows-only solutions. Is Apache's FOP the best way to go? Are there any alternatives?

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