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• MVVM framework AND Prism 4?

  - by Karsten

  I just read this question. It has some nice answers, but they are over 1 year old, and a lot have changed in this space over the last year. Some of the most popular frameworks have come out in a new mayor release such as Prism and MVVM Light Toolkit. My question is somehow the same, but with one twist, I'm already using Prism 4.0 because of the region and module features. Prism 4.0 embraces MVVM, but I feel there are something which are "not lightweight", for instance interaction requests. So I'm thinking would it better to use another MVVM framework either as a substitute or a supplement for Prism 4.0?

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• The Collatz Sequence problem

  - by Gandalf StormCrow

  I'm trying to solve this problem, its not a homework question, its just code I'm submitting to uva.onlinejudge.org so I can learn better java trough examples. Here is the problem sample input : 3 100 34 100 75 250 27 2147483647 101 304 101 303 -1 -1 Here is simple output : Case 1: A = 3, limit = 100, number of terms = 8 Case 2: A = 34, limit = 100, number of terms = 14 Case 3: A = 75, limit = 250, number of terms = 3 Case 4: A = 27, limit = 2147483647, number of terms = 112 Case 5: A = 101, limit = 304, number of terms = 26 Case 6: A = 101, limit = 303, number of terms = 1 The thing is this has to execute within 3sec time interval otherwise your question won't be accepted as solution, here is with what I've come up so far, its working as it should just the execution time is not within 3 seconds, here is code : import java.util.Scanner; class Main { public static void main(String[] args) { Scanner stdin = new Scanner(System.in); int start; int limit; int terms; int a = 0; while (stdin.hasNext()) { start = stdin.nextInt(); limit = stdin.nextInt(); if (start > 0) { terms = getLength(start, limit); a++; } else { break; } System.out.println("Case "+a+": A = "+start+", limit = "+limit+", number of terms = "+terms); } } public static int getLength(int x, int y) { int length = 1; while (x != 1) { if (x <= y) { if ( x % 2 == 0) { x = x / 2; length++; }else{ x = x * 3 + 1; length++; } } else { length--; break; } } return length; } } And yes here is how its meant to be solved : An algorithm given by Lothar Collatz produces sequences of integers, and is described as follows: Step 1: Choose an arbitrary positive integer A as the first item in the sequence. Step 2: If A = 1 then stop. Step 3: If A is even, then replace A by A / 2 and go to step 2. Step 4: If A is odd, then replace A by 3 * A + 1 and go to step 2. And yes my question is how can I make it work inside 3 seconds time interval?

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• PHP exec() on windows not working

  - by Rich Harrington

  Hey, I'm trying to execute a program on windows through PHP, the command is posted below. This doesn't seem to be running through the script at all, even though it works when the command is manually entered into the command prompt. exec('C:\\ffmpeg -i ' . $movedfile . ' -acodec aac -ab 128k -vcodec libx264 -fpre C:\\ffmpeg\\share\\ffmpeg\\libx264-hq.ffpreset -crf 22 -threads 0 -wpredp 0' . $convertedfile); Any suggestions? Thanks! EDIT: There are two slashes for path seperators, stack overflow only displays one though

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• Using dlls compiled in Visual Studio 2010 with target .NET Franework 4.0 in Visual Studio 2008

  - by brickner

  I know it's a bit close to Can I use .NET 4.0 beta in Visual Studio 2008? But my question is a bit different. I have a project that now uses .NET 4.0 (target .NET Framework 4.0) in Visual Studio 2010. Is it possible to use the project compiled dlls in Visual Studio 2008? How? I don't want to use .NET4.0 directly in Visual Studio 2008, only the compiled dlls with target .NET Framework 4.0 (this is how my question is different that what has been asked so far). I know that I was able to use .NET3.5 in Visual Studio 2005. So why not .NET4.0 in Visual Studio 2008?

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• How does mysql define DISTINCT() in reference documentation

  - by goran

  EDIT: This question is about finding definitive reference to MySQL syntax on SELECT modifying keywords and functions. /EDIT AFAIK SQL defines two uses of DISTINCT keywords - SELECT DISTINCT field... and SELECT COUNT(DISTINCT field) ... However in one of web applications that I administer I've noticed performance issues on queries like SELECT DISTINCT(field1), field2, field3 ... DISTINCT() on a single column makes no sense and I am almost sure it is interpreted as SELECT DISTINCT field1, field2, field3 ... but how can I prove this? I've searched mysql site for a reference on this particular syntax, but could not find any. Does anyone have a link to definition of DISTINCT() in mysql or knows about other authoritative source on this? Best EDIT After asking the same question on mysql forums I learned that while parsing the SQL mysql does not care about whitespace between functions and column names (but I am still missing a reference). As it seems you can have whitespace between functions and the parenthesis SELECT LEFT (field1,1), field2... and get mysql to understand it as SELECT LEFT(field,1) Similarly SELECT DISTINCT(field1), field2... seems to get decomposed to SELECT DISTINCT (field1), field2... and then DISTINCT is taken not as some undefined (or undocumented) function, but as SELECT modifying keyword and the parenthesis around field1 are evaluated as if they were part of field expression. It would be great if someone would have a pointer to documentation where it is stated that the whitespace between functions and parenthesis is not significant or to provide links to apropriate MySQL forums, mailing lists where I could raise a question to put this into reference. EDIT I have found a reference to server option IGNORE SPACE. It states that "The IGNORE SPACE SQL mode can be used to modify how the parser treats function names that are whitespace-sensitive", later on it states that recent versions of mysql have reduced this number from 200 to 30. One of the remaining 30 is COUNT for example. With IGNORE SPACE enabled both SELECT COUNT(*) FROM mytable; SELECT COUNT (*) FROM mytable; are legal. So if this is an exception, I am left to conclude that normally functions ignore space by default. If functions ignore space by default then if the context is ambiguous, such as for the first function on a first item of the select expression, then they are not distinguishable from keywords and the error can not be thrown and MySQL must accept them as keywords. Still, my conclusions feel like they have lot of assumptions, I would still be grateful and accept any pointers to see where to follow up on this.

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• Discussions on software architecture - Is StackOverflow appropriate place?

  - by Microkernel

  Hi guys, I am using StackOverFlow for sometime, and its absolutely absolutely awesome for discussions on coding issues. But I don't see discussions on software architecture and designs. What I mean is, I don't see discussions where people put their design ideas and architecture of their software for discussions and ask for reviews and comments. So my question is, is StackOverFlow not the place for such discussions and is there any other place specialized for such discussions. (Like http://serverfault.com for system administrators or http://superuser.com). I am asking this question because, I am a beginner and am coding a piece of software for a course project and am too enthusiastic about it (and passionate too) and want to release it as OpenSource. And I want the code to be highly modular and highly extensible. But as a beginner I am not sure if the design I have comeup is good or not. So want to discuss it with people. Thank You MicroKernel :)

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• Jpeg calculating max size

  - by Doodle

  I have to say the I don't know much about how file formats work. My question is say I have a jpeg file that is 200 px by 200 px, how can one calculate what the maximum size that file could be in terms of megabytes/bytes? I think that the reasoning that led to the question will help some one answer me. I have a Java Applet the uploads Images that people draw with it to my server. I need to know what the max size that this file can conceivably reach. It is always going to be 200x200. It sounds dumb but are there colors that take more byte size then others and if so what is the most expensive one?

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• FullCalendar: Change agendaDay background-color..

  - by Nick-ACNB

  While I have seen this question asked, I haven't seen the answer. Basically, I just want to be able to color the background-color of the TD from a certain range.. Say I have my calendar that has slot minutes every 15 minutes and from 9am to 9pm, I would like to only color differently 10am to 3pm. This information would be coming from a feed but that is not an issue. I haven't found the TDs relating to a set time inside the calendar. Perhaps I missed something? :) I am rather new to jQuery and fullCalendar. Also, another quick question that is unrelated to the main one: is it possible from an event handler to get the id of the calendar that launched it? I have multiple calendars on my page to simulate something like a Gantt view. This will let me be able to fetch the right feed and populate the right events. Thank you for your time.

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• What's viewport mean to the jQuery guys?

  - by justSteve

  I came here intent on asking a 'how do i' type question focused on a particular UI problem i have to solve and i started using the term 'viewport'. Seems there's lots of contexts that tag evokes. Before i outline mine i should ask - is there a generally recognized consensus as to what a 'viewport' is? Any gallery or object browser that focuses on a UI principle where multiple frames/panes show feeds of different graphs where each feed might be a complex grid/graph? I'm imagining something where my page may open with a half dozen different grids (tabular data) stay updated via ajax interactions with various servers. UI elements provide control scale up or down a given grid with a quasi accordion slide kinda thingie. For example, one click on a scale up-or-down control would rescale the other viewports in the opposite direction. More clicks - more pronounced effect. So my 'how do i' question morphs into a 'how have others...' thx

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• Objective-C (iPhone) Memory Management

  - by Steven

  I'm sorry to ask such a simple question, but it's a specific question I've not been able to find an answer for. I'm not a native objective-c programmer, so I apologise if I use any C# terms! If I define an object in test.h @interface test : something { NSString *_testString; } Then initialise it in test.m -(id)init { _testString = [[NSString alloc] initWithString:@"hello"]; } Then I understand that I would release it in dealloc, as every init should have a release -(void)dealloc { [_testString release]; } However, what I need clarification on is what happens if in init, I use one of the shortcut methods for object creation, do I still release it in dealloc? Doesn't this break the "one release for one init" rule? e.g. -(id)init { _testString = [NSString stringWithString:@"hello"]; } Thanks for your helps, and if this has been answered somewhere else, I apologise!! Steven

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• Behaviour of insertion trigger when defining autoincrement in Oracle

  - by Genba

  I have been looking for a way to define an autoincrement data type in Oracle and have found these questions on Stack Overflow: Autoincrement in Oracle Autoincrement Primary key in Oracle database The way to use autoincrement types consists in defining a sequence and a trigger to make insertion transparent, where the insertion trigger looks so: create trigger mytable_trg before insert on mytable for each row when (new.id is null) begin select myseq.nextval into :new.id from dual; end; I have some doubts about the behaviour of this trigger: What does this trigger do when the supplied value of "id" is different from NULL? What does the colon before "new" mean? I want the trigger to insert the new row with the next value of the sequence as ID whatever the supplied value of "new.id" is. I imagine that the WHEN statement makes the trigger to only insert the new row if the supplied ID is NULL (and it will not insert, or will fail, otherwise). Could I just remove the WHEN statement in order for the trigger to always insert using the next value of the sequence?

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• What documentation is helpful when supporting an application?

  - by Andrew

  I am going to be taking over from a developer here at work soon. Hence, I'll be supporting all the applications that he has written over the last few years. My question is, when supporting an application that you probably don't know much about, what kind of documentation is most helpful to get a handle on how to fix problems, extend functionality, modify functionality, etc? I'm thinking it would need to give you an overview of what the software does, what interfaces it has to other software, what databases it uses, usernames, passwords, and so on. Is there such a thing as a software support document? Referrals to any templates would be most helpful. BTW, unfortunately, there are no requirements documents, specs, etc! So, really my question is, if my colleague had a day to write a single document for each application so that I could (more easily) support it, what would that document be and/or what would it look like?

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• .NET - Is it possible to proxy a HTTPS request using HttpListener & HttpWebRequest? (or is it not p

  - by Greg

  Hi, Question - Is it possible to proxy a HTTPS request using HttpListener & HttpWebRequest? (or is it not possbile due to the encryption?) I have got a .NET proxy working by using HttpListener & HttpWebRequest using the approach here. I'm trying to extend this at the moment to listen for HTTPS too (refer this question) however I'm wondering if I'm trying to tackle something that is not possible...That is if this code works by listening for the HTTPS request (using HttpListener) and then copying headers & content across to a new HttpWebRequest, is this flawed as it may not be able to decrypt the request to get the content? But then normal proxy servers obviously can proxy HTTPS, so I guess perhaps it will work because it will just copy across the encrypted content?

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• twitter's officially supported android application

  - by sorens

  i am developing an application for android and would like for my users to be able to post some information from my application to their twitter feed. i know how to make this work by building a VIEW intent and forwarding the user to the android built-in web browser (thanks to stack overflow!) However, now that there is an official Twitter application, I would like to be able to use the twitter applications activity (if it is installed) to make the post. However, I can not find any developer documentation on what the Twitter Intent for Android is called. Can someone provide a short snippet of sample code that includes that text of the Intent to use?

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• How can I use a custom ValidationAttribute to ensure two properties match?

  - by Brandon Linton

  We're using xVal and the standard DataAnnotationsValidationRunner described here to collect validation errors from our domain objects and view models in ASP.NET MVC. I'd like to have a way to have that validation runner identify when two properties don't match through the use of custom DataAnnotations. Right now I'm forced into doing it outside of the runner, this way: if (!(model.FieldOne == model.FieldTwo)) errors.Add(new ErrorInfo("FieldTwo", "FieldOne must match FieldTwo", model.FieldTwo)); My question is: can this be done using property-level validation attributes, or am I forced into using class-level attributes (in which case, I'd have to modify the runner...and my follow up question would be how best to retrieve them in that case). Thanks!

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• Remove Duplicates from LEFT OUTER JOIN

  - by Kaushik Gopal

  Hey folk my question is quite similar to http://stackoverflow.com/questions/757957/restricting-a-left-join I have a variation in that request though and the comment didn't allow too many characters hence posting as a new question. I hope this doesn't go against the posting rules/etiquette. Assuming i have a table SHOP and another table LOCATION. Location is a sort of child table of table SHOP, that has two columns of interest, one is a Division Key (calling it just KEY) and a "SHOP" number. This matches to the Number "NO" in table SHOP. I tried this left outer join: SELECT S.NO, L.KEY FROM SHOP S LEFT OUTER JOIN LOCATN L ON S.NO = L.SHOP But i'm getting a lot of duplicates since there are many locations that belong to a single shop. I want to eliminate them and just get a list of "shop, key" entries without duplicates. any ideas how? (edit: ORACLE 10g Database)

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• Is there such a thing as an "elisp bundle" for TextMate?

  - by Vivi

  I started using Code Collector Pro to organise and save my Emacs codes, and this software requires TextMate bundles for syntax highlighting. They have a lisp bundle, but not an elisp bundle, at least not that I can see. I would think that the syntax highlighting would work under the lisp bundle, but for some reason it isn't happening. I have never even seen any lisp code with syntax highlighting, so it is possible that the thing is working and I don't know, but I honestly don't think so, because the ;; before a line seems to me to be a comment thing, so anything after that should be in the color defined for comments which in my case is green. Here is a picture of my code collector screen with a piece of code written by huaiyuan answering my question posted here: Is this looking as it should or is there something wrong? Back to the initial question: is there a textmate bundle for elisp or a bundle like the ones from textmate I can download to get syntax highlighting?

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• NSStepper ignores current NSTextField value

  - by JanX2

  I have the same initial problem as described in Integrate NSStepper with NSTextField: I need to have a NSTextField working with a NSStepper as being one control so that I can edit an integer value either by changing it directly on the text field or using the stepper up/down arrows. Using bindings as commented on by carlosb results in a usable UI. However, in the initial question carlosb describes the following: Problem is that if I edit the text field then click the stepper again it will forget about the value I manually edited and use the stepper's internal value. This is why I am posting a variation on this question again. carlosb's use of bindings doesn't solve this problem. This happens in both the current project I am working on and a test project I have created. The test project can be found at GitHub. You can download it there (even without git) via the "Download Source" button in the top right. Is there a clean way to solve this issue?

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• How do I change apache2 DocumentRoot (default snow leopard install) and not get "You don't have perm

  - by David Peek

  I'm trying to point DocumentRoot at a directory in my user folder. While I can happily point DocumentRoot at /Library/WebServer/Documents and ~/Sites I keep getting "You don't have permission to access / on this server." when I point it anywhere else. OK, I just found a solution mid-question (stack overflow is just that good) by changing the user/group apache runs under to myuser/admin. I'm sure there must be a better way though. Surely some kind of permissions magic on the directory I'm pointing at?

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• Flowcharting tool/add-in for Visual Studio

  - by Rajah

  A 2 part question: Are flow-charts, as tool to analyze source-code, no longer considered useful? The reason I ask this question is that if you Google for source-code to flowchart tools for Visual Studio, there are no relevant results. Also, Microsoft does not seem to have a tool for this purpose. Are people just not using flowcharts that much any more? (I find them to be a great way to document complex logic in my code). Are there any VS tools that can take .Net (C#, VB.Net) code and convert it to a flowchart? (The only tool that I found is Aviosto's Visustin, which does not provide VS integration). Any other tools that you can recommend for this purpose?

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• Better way to make side-by-side DIVs in CSS

  - by JoelFan

  I have 2 DIV's that I want to be side-by-side under all circumstances. So far I am accomplishing it like this: <div style="float: left"> <table> ... </table> </div> <div style="float: right; overflow: scroll; width: 1000px"> <pre> ... </pre> </div> However, I don't like that I have to specify an absolute width in the 2nd div. I just want the 1st div to be the minimum width to display the table and 2nd div to take up the rest of the space without overflowing. Is there a better way?

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• Working with jTempalte and objects

  - by Dejan.S

  EDITSolved the one object question I had at first Hi I'm using jTemplate for the first time. I been reading and it's not that hard to use it BUT I just found a examaple on one object use. <script type="text/html" id="TemplateREsultTable"> <div style="background-color: #ccc">{$T.Email}</div> <div style="background-color: #ddd">{$T.Password}</div> </script> One question about jTempaltes I got is what is better to do them in htm file or script? Another thought I got, is jTemplate the way to go?

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• Rewriting UNIX cal(1)

  - by dharmatech

  Hello, Today I was testing out SRFI 19 and wrote a simple version of the UNIX cal(1) command. Here's a version in R6RS Scheme which runs in Ikarus and Ypsilon. A few example runs. Schemers: How would you write it? Use your favorite implementation. Ruby and Python: I'm guessing that y'all have elegant date and time libraries. I'm sure you can put the Schemers to shame. ;-) Let's see what ya got. I'd also like to see Haskell and golfed versions. Is there a Stack Overflow tag for re-implementations of UNIX commands? :-) Ed

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• Static/Dynamic vs Strong/Weak

  - by Dan Revell

  I see these terms banded around all over the place in programming and I have a vague notion of what they mean. A search shows me that such things have been asked all over stack overflow in fact. As far as I'm aware Static/Dynamic typing in languages is subtly different to Strong/Weak typing but what that difference is eludes me. Different sources seem to use different different meanings or even use the terms interchangeably. I can't find somewhere that talks about both and actually spells out the difference. What would be nice is if someone could please spell this out clearly here for me and the rest of the world.

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• priority in round robin

  - by anu

  do we use priority in round-robin if it is given in the question?(but its not mentioned that we have to use it)

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