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• Design Layout/Patterns

  - by wpfwannabe

  I am still fairly new to C# and I am trying to decide the best way to structure a new program. Here is what I want to do and I would like feed back on my idea. Presentation Layer Business Layer (Separate Class Library) Data Layer (Separate Class Library) Model Layer (Separate Class Library) What I am struggling with is if it is ok to have the classes in the Data Layer and Business Layer inherit from the types I define in Model Layer. This way I can extended the types as needed in my Business Layer with any new properties I see fit. I might not use every property from the Model type in my Business Layer class but is that really a big deal? If this isn't clear enough I can try and put together an example.

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• What is better, a STL list or a STL Map for 20 entries, considering order of insertion is as importa

  - by Abhijeet

  I have the following scenario.The implementation is required for a real time application. 1)I need to store at max 20 entries in a container(STL Map, STL List etc). 2)If a new entry comes and 20 entries are already present i have to overwrite the oldest entry with the new entry. Considering point 2, i feel if the container is full (Max 20 entries) 'list' is the best bet as i can always remove the first entry in the list and add the new one at last (push_back). However, search won't be as efficient. For only 20 entries, does it really make a big difference in terms of searching efficiency if i use a list in place of a map? Also considering the cost of insertion in map i feel i should go for a list? Could you please tell what is a better bet for me ?

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• PHP: How to cast object to inherited class?

  - by andreyvlru

  I'd like to inherit PDOStatement class and use it in my website scripts. But I am frustrated how to get required object. PDO::query returns only direct PDOStatement object and looks like there are no other method to create PDOStatement object or inherited class. Initially i thought to move PDOStatement object to constructor of inherit class Something like that: $stmt = PDO -> query("select * from messages"); $messageCollection = new Messaging_Collection($stmt); But how to make instance of PDOStatement to inherited object (Messaging_Collection). It is a big question for me. class Messaging_Collection extends PDOStatement { public function __construct(PDOStatement $stmt) { //there i should to transform $stmt to $this // direct $this = $stmt is not possible // is there other right way? }

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• Decoding subsampled bitmaps in Android

  - by hgpc

  I decode bitmaps from the SD card using BitmapFactory.decodeFile. Sometimes the bitmaps are bigger than what the application needs or that the heap allows, so I use BitmapFactory.Options.inSampleSize to request a subsampled (smaller) bitmap. The problem is that the platform does not enforce the exact value of inSampleSize, and I sometimes end up with a bitmap either too small, or still too big for the available memory. From http://developer.android.com/reference/android/graphics/BitmapFactory.Options.html#inSampleSize: Note: the decoder will try to fulfill this request, but the resulting bitmap may have different dimensions that precisely what has been requested. Also, powers of 2 are often faster/easier for the decoder to honor. How should I decode bitmaps from the SD card to get a bitmap of the exact size I need while consuming as little memory as possible to decode it?

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• Is there a way to circumvent Python list.append() becoming progressively slower in a loop as the lis

  - by Deniz

  I have a big file I'm reading from, and convert every few lines to an instance of an Object. Since I'm looping through the file, I stash the instance to a list using list.append(instance), and then continue looping. This is a file that's around ~100MB so it isn't too large, but as the list grows larger, the looping slows down progressively. (I print the time for each lap in the loop). This is not intrinsic to the loop ~ when I print every new instance as I loop through the file, the program progresses at constant speed ~ it is only when I append them to a list it gets slow. My friend suggested disabling garbage collection before the while loop and enabling it afterward & making a garbage collection call. Did anyone else observe a similar problem with list.append getting slower? Is there any other way to circumvent this?

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• how 2 use logmath twice in same form(sphinx4)

  - by Pradeep

  i have configured sphinx with netbeans and its wroking fine. but im using a button to do the process. but after it recognisers. i want to do the process again. but then it gives a error saying the "logmath instance is already present" and saying cannot open the microphone. can someone give me a solution. what i want to do is use speech recogntion in several times in the same form. till it gives the correct answer. please help me this is the error i get "Creating new instance of LogMath while another instance is already present 10:53:27.833 SEVERE microphone Can't open microphone line with format PCM_SIGNED 16000.0 Hz, 16 bit, mono, 2 bytes/frame, big-endian not supported."

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• UIImages on UITableView?

  - by babu Kong

  what is the best method to display about 300 png images into a UITableView.. i dont wanna display them at the same time... i have 3 tableViewControllers that will each display about 100 imgaes.. (its for a catalog so the images are important to display) i used [uiimage imageNamed:] but that method caches the images and they dont get released so the memory usage is big.... is there any way to release the cache when the nav controller pushes a different view controller? i also tried [uiimage alloc] initWithContentsOfFile] but the images wont display.... any help?

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• What Does OSGi Solve?

  - by Pablo Fernandez

  I've read on wikipedia and other sites about OSGi, but I don't really see the big picture. It says that it's a component based platform, and that you can reload modules at runtime. Also the "practical example" given everywhere is the Eclipse Plugin Framework. My questions are: 1) What is the CLEAR and SIMPLE definition of OSGi? 2) What COMMON PROBLEMS does it solve? By "common problems" I mean problems we face everyday, like "what can OSGi do for making our jobs more efficient/fun/simple" Thanks.

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• In Clojure - How do I access keys in a vector of structs

  - by Nick

  I have the following vector of structs: (defstruct #^{:doc "Basic structure for book information."} book :title :authors :price) (def #^{:doc "The top ten Amazon best sellers on 16 Mar 2010."} best-sellers [(struct book "The Big Short" ["Michael Lewis"] 15.09) (struct book "The Help" ["Kathryn Stockett"] 9.50) (struct book "Change Your Prain, Change Your Body" ["Daniel G. Amen M.D."] 14.29) (struct book "Food Rules" ["Michael Pollan"] 5.00) (struct book "Courage and Consequence" ["Karl Rove"] 16.50) (struct book "A Patriot's History of the United States" ["Larry Schweikart","Michael Allen"] 12.00) (struct book "The 48 Laws of Power" ["Robert Greene"] 11.00) (struct book "The Five Thousand Year Leap" ["W. Cleon Skousen","James Michael Pratt","Carlos L Packard","Evan Frederickson"] 10.97) (struct book "Chelsea Chelsea Bang Bang" ["Chelsea Handler"] 14.03) (struct book "The Kind Diet" ["Alicia Silverstone","Neal D. Barnard M.D."] 16.00)]) I would like to sum the prices of all the books in the vector. What I have is the following: (defn get-price "Same as print-book but handling multiple authors on a single book" [ {:keys [title authors price]} ] price) Then I: (reduce + (map get-price best-sellers)) Is there a way of doing this without mapping the "get-price" function over the vector? Or is there an idiomatic way of approaching this problem?

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• Best commercial libraries for developing NCPDP-based systems (prescription drug related)

  - by Kaveh Shahbazian

  What are (based on experiences) best commercial libraries for developing NCPDP-based systems? Edit 2: Thanks to all for help! NCPDP (National Council for Prescription Drug Programs) is an standard for e-prescribing. It defines two formats for message transmission: binary and XML. Implementing XML is somehow easier because it is a standard format which in turn gives us more tooling options. The binary format has a very big specification and time-consuming to implement. I did not find an open source solution to work with. So I am looking for commercial alternatives. Edit 1: Please guide me; what's wrong with this question?

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• Why eGet() in EMF returns Object rather than EObject?

  - by Gabriel Šcerbák

  I am working on some code using the EMF framework in Java, but it is really hard to use, e.g. I cannot implement OCL-like query API on top of EMF which would be type-safe. One of the reasons is that eGet() for a EStructuralFeature return just an Object, not EObject. So anything I would write must use much of null checking, type checking and type casting which is unsafe, not performant and cannot be generalized in a reusable way. Why doesn't EMF generate dummy implementations with EObject wrappers for arbitrary Object value? Implementing the EObject and hence the EClass interfaces even with simple throw UnsupportedOperationException is really a pain (the APIs are too big). The same holds for the eContainer() method which makes navigatinng the model upwards painful.

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• Dynamically creating controls in MFC (Collection question)

  - by ProgramWriter

  Hello all, I have some custom control inside of which i should create radiobuttons or checkboxes. The count of child controls is available only at runtime (it loads some file from which it gets this count). So i need to create variable number of controls. Which collection i should use for this purpose? Solution 1: simply use std::vector (or CArray) - not suitable because i want use MFC (CButton). Of course i can Attach() and later Detach() handle to window each time i need this window, but it will give big overhead. Solution 2: use std::vector or CArray or CList or... In this case i take care about making 'new' and appropriate 'delete' when control is unneeded. I am forgetful :) MFC handle map contains pointer to CButton and i can't use simple CArray, because it will move my objects each time when his size will grow. ... and the question is: Which collection i should use for containing variable count of MFC control classes?

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• Convet long/lat to pixel x/y on a given picure.

  - by kalininew

  I have a city "map" (for example - Moscow). She in accuracy repeats the contours the given city in google maps (that is it is copied from google maps and it is a little processed, but the sense remained the same). Also I have object co-ordinates in a city (in co-ordinates of google). Problem: how to translate google co-ordinates to the co-ordinates of my picture (that is in pixels on OX and OY on a picture). That is I receive google-co-ordinates and it is necessary for me to draw this point on my picture. I know that on small scales (for example on city scales) it to make simply enough (it is necessary to learn what google-co-ordinates has one of picture corners, then to learn "price" of one pixel in google-co-ordinates on a picture on axes OX and OY separately). But on the big scales (country scale) "price" of one pixel will be not a constant, and will vary strongly enough and the method described above cannot be applied. How to solve a problem on country scales?

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• Selection of parameters in Diffie-Hellman

  - by allenzzzxd

  Hello, maybe it's not so proper to ask this question here... anyway, I'm trying to use the gmp library for the implementation of DH, but the problem here I got is: Once, when I was doing the tests to observe the output, although big values of prime and the private keys were selected: p was about more than 300 digits long in decimal a, b were about 100 digits long finally I got a shared secret key which was extremely small, perhaps smaller than 10^8 in decimal... This problem didn't show up many times, in fact, during all the observation, it appeared just once...but still, this was not so good at all. So I wonder if there are some methods which can avoid this... Thanx a lot

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• Projecting a targetting ring using direct3d

  - by JohnB

  I'm trying to draw a "targetting ring" on the ground below a "unit" in a hobby 3d game I'm working on. Basically I want to project a bright red patterned ring onto the ground terrain below the unit. The only approach I can think of is this - Draw the world once as normal Draw the world a second time but in my vertex shader I have the world x,y,z coordinates of the vertex and I can pass in the coordinates of the highlighted unit - so I can calculate what the u,v coordinates in my project texture should be at that point in the world for that vertex. I'd then use the pixel shader to pick pixels from the target ring texture and blend them into the previously drawn world. I believe that should be easy, and should work but it involves me drawing the whole visible world twice as it's hard to determine exactly which polygons the targetting ring might fall onto. It seems a big overhead to draw the whole world twice, once for the normal lit textured ground, and then again just to draw the targetting ring. Is there a better approach that I'm missing?

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• Dropping support for IE6, Is swfObject still relevant?

  - by Armitage

  We have recently dropped support for IE6 at my job. The other developers have have opted for a generic object embed method: <object type="application/x-shockwave-flash" data="example.swf" width="800" height="600" > <param name="movie" value="example.swf"> <param name="allowScriptAccess" value="always"> </object> This seems to work in all modern browsers but it really rubs me the wrong way. I'm sure this is wrong in several ways and is clearly a big step back in sophistication. So my question is in 2 parts, what is wrong with the above method? Is swfObject still best practice and what issues does it solve (besides IE6 click-activate)? Citations less then a year old would also be helpful.

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• loading mp3 from file using random access to flash.media.Sound

  - by Irfan Mulic

  We are migrating application from Delphi to Flex (Air) that plays mp3 files from random access big file. it has positions and sizes to extract mp3 data to FileStream-MemoryStream and then we use bass.dll to play it from memory stream. Now I have to play those same mp3's in flex but I am not sure how... I was reading something similar for reading/writing data using ByteArray from here but how to apply it to flash.media.Sound ? http://livedocs.adobe.com/flex/3/html/help.html?content=ByteArrays_2.html Any help?

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• jQuery pre document ready event

  - by Luke Duddridge

  Hi, I have a list of 179 thumbnail images that I am trying to apply a jQuery lightbox tool to an unorder list of hyper-links. The problem I have is, the jQuery isnt firing until the images have finished downloading, each image is around 23K so on their own, not so big, but as a group this equates to around 4MB. There is a delay on IE (main browser used by clients) of a good 5 seconds before the page has completely downloaded every thumbnail and then allows the jQuery to fire. I have tried putting the jQuery document ready event in various places with no success, and only been able to put a bandaid on by setting the css on the ul to hide using display:none before applying .show() after the lightbox has applied. I was hoping there is a way to make the jQuery scripts fire before all the content has downloaded? Cheers

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• Log to rolling CSV file with Enterprise Library

  - by Tinminator

  Need logging to: Rolling file, to avoid 1 big log file. CSV format for easier look up. I can see EntLib (5.0) have Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.RollingFlatFileTraceListener to log to rolling log file. To make the log entries look like a CSV row, I can change the Logging.Formatters.TextFormatter.Template to put double quote around the values. Also change the Listener's Footer and Header to nothing, so they won't be output. Under normal circumstance, this would give me a well formed CSV file. However if a token value in the Template contain double quote, this would not be escaped, hence the log file become an invalid CSV file. Is there any way to resolve this? Is there any alternative solutions to this problem?

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• How would I / could I obtain an reasonably comprehensive list of domain names?

  - by Simon

  I know that domain names are constantly changing, and I know there are a lot of them, but there is clearly a region of the domain name space which is stable. How would I go about getting a list, even a very big one? Such a thing must logically exist, even if it is in a distributed form, because the web's DNS servers resolve names to IP addresses. So in theory if I could poll all the DNS servers in the world at a moment in time I would have the complete list of mapped names. Is there a practical way of doing that? As an aside, does anyone have any good estimates of how many domain names exist at the moment?

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• How does a virtual machine work?

  - by Martin

  I've been looking into how programming languages work, and some of them have a so-called virtual machines. I understand that this is some form of emulation of the programming language within another programming language, and that it works like how a compiled language would be executed, with a stack. Did I get that right? With the proviso that I did, what bamboozles me is that many non-compiled languages allow variables with "liberal" type systems. In Python for example, I can write this: x = "Hello world!" x = 2**1000 Strings and big integers are completely unrelated and occupy different amounts of space in memory, so how can this code even be represented in a stack-based environment? What exactly happens here? Is x pointed to a new place on the stack and the old string data left unreferenced? Do these languages not use a stack? If not, how do they represent variables internally?

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• The Benefits of Constants

  - by onaclov2000

  I understand one of the big deals about constants is that you don't have to go through and update code where that constant is used all over the place. Thats great, but let's say you don't explicitly declare it as a constant. What benefit(s) exist(s) to take a variable that HAPPENS to actually not be changed and make it a constant, will this save on processing, and/or size of code...etc? Basically I have a program that the compiler is saying that a particular variable is not changed and thus can be declared a constant, I just wanted to know what the benefit to adding the constant qualifier to it would be, if it makes no difference then making that change adds no value and thus no point wasting time (this same scenario occurs in more then one place) going back and "fixing" all these variables. Thank you, onaclov

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• Write a sql to get the last data

  - by Lu Lu

  Hello everyone, I have a Realtime table with example data: Symbol Date Value ABC 1/3/2009 03:05:01 327 -- is last data for 'ABC' ABC 1/2/2009 03:05:01 326 ABC 1/2/2009 02:05:01 323 ABC 1/2/2009 01:05:01 313 BBC 1/3/2009 03:05:01 458 -- is last data for 'BBC' BBC 1/2/2009 03:05:01 454 BBC 1/2/2009 02:05:01 453 BBC 1/2/2009 01:05:01 423 Please help me to write a sql to return last data for all symbol. The result is: Symbol Date Value ABC 1/3/2009 03:05:01 327 BBC 1/3/2009 03:05:01 458 P/s: I use sql server 2005. And Realtime data is very big, please optimize the sql code. Thanks.

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• Javascript timers

  - by resopollution

  I'm starting on a javascript MMORPG that will actually work smoothly. Currently, I created a demo to prove that I can move characters around and have them chat with each other, as well as see eachother move around live. http://set.rentfox.net/ Now Javascript timers are something I have not used extensively, but from what I know, correct me if I'm wrong, is that having multiple setIntervals happening at the same time doesn't really work well b/c it's all on a single thread. Lets say I wanted to have 10 different people nuking fireballs at a monster by using sprite background positioning with setInterval -- that animation would require 10 setIntervals doing repainting of the DOM for sprite background-position shifts. Wouldn't that be a big buggy? I was wondering if there was a way around all this, perhaps using Canvas, so that animations can all happen concurrently without creating an event queue and I don't have to worry about timers. Hope that makes sense, and please let me know if I need to clarify further.

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• Options for non-native form inputs for the web?

  - by Sam Lee

  I'm wondering if there are any good non-native form inputs for web development? I am currently using the built in <input> controls. They work just fine, but for my application they are too big (especially on OS X). I am wondering if there are any libraries that I can drop in as replacements. I am especially interested in ones that: Are a close to native control behavior as possible. Support for tabbing, highlighting current textbox, pressing up/down in <select>, etc. Have something that replicates <select> Look good and are compact I am aware that you can use CSS for some styling, but it's pretty minimal and looks different depending on the browser. Thanks for your help.

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