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Legality Of Re-Implementing An Existing API (e.g. GNU implementing the UNIX APIs)

- by splicer

I've often wondered about this. I'm not looking for legal advice, just casual opinions ;) If some company publishes an API on the web for their closed-source library, would it be legal for another party to release an open-source implementation of that API? Are function declarations considered source code? Take GNU implementing the UNIX APIs, for example. The UNIX standard gives the following function declaration and defines its required behaviour in English: char * mktemp(char *template); Now, consider an API that lists and declares and describes several thousand (more much complex) functions, enums, etc.; an API which defines a solution to a non-trival set of problems. If an open-source project publishes C headers that copy (verbatim) the function definitions contained in the closed-source company's published API, doesn't that violate some sort copyright law?

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Subversion version 'difference' a big deal?

- by CmdrTallen

Greetings, using VS2008 and VisualSVN and seems the VisualSVN folks are religious about updating the client (and their VisualSVN server) to the latest Subversion release. My question is my subversion server is a hosted server and seems to always lag several versions behind the client I use. Should I be concerned about this version "mis-match"? Is there a general rule of thumb about when it is a point to be concerned (like an entire major release behind)? Any sort of mechanism build into either the client, the server or the protocol that prevents something horrible from happening between badly 'paired' clients and servers?

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Visit neighbor of a position in a 2d-array

- by Martin

I have the following two dimensional array: static int[,] arr = new int[5, 5] { { 00, 00, 00, 01, 00 }, { 00, 00, 01, 01, 00 }, { 00, 00, 01, 01, 00 }, { 00, 00, 01, 01, 00 }, { 00, 00, 00, 01, 00 }, }; I have to a implement a method called Hit(int x, int y). When we hit a 0 in the array (i.e. Hit(0, 0), Hit(1, 1), but not Hit(3, 0)) I would like all the adjacent zeros to the zero we hit to be incremented by 10. So if I call Hit(1, 1), the array should become the following. static int[,] arr = new int[5, 5] { { 10, 10, 10, 01, 00 }, { 10, 10, 01, 01, 00 }, { 10, 10, 01, 01, 00 }, { 10, 10, 01, 01, 00 }, { 10, 10, 10, 01, 00 }, }; Any idea how I could implement that? It sounds to me like a Depth First Search/Recursive sort-of algorithm should do the job, but I haven't been able to implement it for an 2d array. Thanks for the help!

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How can I make visual studio 2010 deploy (or FTP upload) a page on save?

- by Isa

Just started using Visual Studio 2010, moved over from Netbeans. I kinda liked the Netbeans upload on save functionality, which was useful in development environments when one is constantly making small changes and testing them. As soon as you saved a file, it would be synced to the FTP server. Is it possible to do this in VS? I'm pretty sure there is a way, using a macro of some sort, and having it run on every save? However I have no idea how to implement it... Maybe even a keyboard shortcut to deploy the current working file would be nice.

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Get data from html form to ruby in Ruby on Rails

- by Maestro1024

Get data from html form to ruby in Ruby on Rails I have some html like this <html> <h1>Text to PDF</h1> <textarea name="comments" cols="40" rows="5"> Enter your Text here... </textarea><br> <input type="submit" value="Submit" /> </form> </body> </html> I want to give the value of the text into the controller for this page/view. How do I do this with rails? I am new to rails, what is the mechanism for this? I don't need to write to the database just want to hand it to the controller. If there is a good tutorial for this sort of thing that would be great, I am not convince I am approaching this correctly.

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addDoubleClickHandler to a FixedWidthGrid !!

- by MArio

Hello so I got a FixedWidthGrid table which is made from a pagingtable FixedWidthGrid dataTable = x.getDataTable(); I could add alot of handlers to the dataTables rows like selected or sort policies. but I cant add a double click handler ... anyway idea's ?! thank you I do have a class which I made to try to add a double click hander but it didn't work. class: public class DoubleClickTable extends FixedWidthGrid implements HasDoubleClickHandlers { public DoubleClickTable() { super(); } public HandlerRegistration addDoubleClickHandler(DoubleClickHandler handler) { return addDomHandler(handler, DoubleClickEvent.getType()); } } Thank you so much for your help.

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What are the Pros and Cons of Cascading delete and updates?

- by Misnomer

Hi, Maybe this is sort of a naive question...but I think that we should always have cascading deletes and updates. But I wanted to know are there problems with it and when should we should not do it? I really can't think of a case right now where you would not want to do an cascade delete but I am sure there is one...but what about updates should they be done always? So can anyone please list out the pros and cons of cascading deletes and updates ? Thanks.

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Serial numbers generation without user data

- by Sphynx

This is a followup to this question. The accepted answer is generally sufficient, but requires user to supply personal information (e.g. name) for generating the key. I'm wondering if it's possible to generate different keys based on a common seed, in a way that program would be able to validate if those keys belong to particular product, but without making this process obvious to the end user. I mean it could be a hash of product ID plus some random sequence of characters, but that would allow user to guess potential new keys. There should be some sort of algorithm difficult to guess.

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Using same Debug settings for Start External Program across 32 bit and 64 bit debug environments

- by Michael Prewecki

We use a mixture of 32-bit and 64-bit development environments. Some of our class libraries are debugged using a 32-bit application so we have debug settings for "Start External Program" and "Working Directory". The problem is that the settings need to be different since the 32-bit application is installed to C:\Program Files\xxx (on the 32-bit dev enviroment) or C:\Program Files (x86)\xxx (on the 64-bit dev environment) Is there a way to use some sort of tag like %PROGRAMFILES% or $(ProgramFiles) so that Visual Studio 2008 will know where to look for the external program? This wouldn't be a major issue except the solution file (where the debug information is saved) is checked into source control...so getting the latest version of the solution from our source repository keeps yoyo'ing the debug settings between the two program files locations.

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What is branched in a repository?

- by Peter M

Ok I hope that this will end up sounding like a reasonable question. From what I understand of subversion if you have a repo that contains multiple projects, then you can branch individual projects within that repo (see SVN Red book - Using Branches) However what I don't quite follow is what happens when you create a branch in one of the distributed systems (Git, Hg, Bazaar - I don't think it matters which one). Can you branch just a sub-directory of the repo, or when you create the branch are you branching the entire repo? This question is part of a larger one that I posted on superuser (choice and setup of version control) and has come about as I am trying to figure out how to best version control a large hierarchal layout of independent projects. It may be that for distributed systems that what I would like to do is best handled by a sub-project mechanism of some sort - but again that is something I am not clear on although I have heard the term mentioned in regards to git.

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How to get all n sets of three consecutives elements in an array or arraylist with a for statement ?

- by newba

Hi, I'm trying to do a convex hull approach and the little problem is that I need to get all sets of three consecutive vertices, like this: private void isConvexHull(Ponto[] points) { Arrays.sort(points); for (int i = 0; i <points.length; i++) { isClockWise(points[i],points[i+1],points[i+2]); } //... } I always do something that I don't consider clean code. Could please help me find one or more ways to this? I want it to be circular, i.e., if my fisrt point of the a set is the last element in the array, the 2nd element will be the 3rd in the list and the 3rd in that set will be the the 2nd element in the list, and so on. They must be consecutive, that's all.

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Get array's key recursively and create underscore seperated string.

- by Nehal

Hello Everyone, Right now i got an array which has some sort of information and i need to create a table from it. e.g. Student{ [Address]{ [StreetAddress] =>"Some Street" [StreetName] => "Some Name" } [Marks1] => 100 [Marks2] => 50 } Now I want to create database table like which contain the fields name as : Student_Address_StreetAddress Student_Address_StreetName Student_Marks1 Student_Marks2 It should be recursive so from any depth of array it can create the string in my format.

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Correct (pretty) window redraw during the creation

- by Coder

Does anyone know what is a correct way to redraw window during lengthy initialization operations? Say I have HWND with NULL brush, and it does some not so quick child window initialization (Window initialization is not so quick on Vista and 7, especially on netbooks, even with threaded app). With this config window stays black for half a second on slower laptops. But if I supply window color brush, it seems that there are some sort of child controls or something that draws black squares on top of it, which also seems ugly. Even though the controls are created without WS_VISIBLE initially. Oh, the window has the WS_EX_COMPOSITED style, which should do the double buffering to avoid flicker. But it still behaves ugly. Are there any other tricks I've forgotten, missed?

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Combine two views into one view

- by Kevin

I have two views that I would like to combine into one. The first view shows all items of X where company ID = Y. This is to give preferential sort to the client first, and then everyone else. So I created a second view, all items of X, where company ID != Y. I created it as an Attachment to attach to the first view, but I don't think I got the intended result. How can I combine these views so the first view results are listed first, and then the second view is too, using the same pager, filters, and arguments? Is there any way of achieving this without programming it?

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C: Pointers to any type?

- by dragme

I hear that C isn't so type-safe and I think that I could use that as an advantage for my current project. I'm designing an interpreter with the goal for the VM to be extremely fast, much faster than Ruby and Python, for example. Now I know that premature optimization "is the root of all evil" but this is rather a conceptual problem. I have to use some sort of struct to represent all values in my language (from number over string to list and map) Would the following be possible? struct Value { ValueType type; void* value; } I would store the actual values elsewhere, e.g: a separate array for strings and integers, value* would then point to some member in this table. I would always know the type of the value via the type variable, so there wouldn't be any problems with type errors. Now: Is this even possible in terms of syntax and typing?

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How to make drupal known submitting custom content

- by Andrew

Hi, I know this is not a drupal forum but, as I’m not getting any response there, I decided to give it a shot here. I’m creating a web site that accepts custom content from users. So, for that matter, this site has a form and a custom module. Instead of using admin theme, this form is placed inside custom template which is created to have a uniform look with the rest of the pages. As a result, creating form elements through hook_form is out of question. Here’s where my problems lie. As this form uses custom theme, I’m not sure as to what can I do to make drupal know that user is submitting new content data when the form is submitted? Would I need to use same query string that of content submission page of admin page like - ?q=node/add/page for action attribute of the html form? (OR) the only way is to map the url to my custom function and invoke some sort of hook inside of it? Thanks

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convert string to dict using list comprehension in python

- by Pavel

I have came across this problem a few times and can't seem to figure out a simple solution. Say I have a string string = "a=0 b=1 c=3" I want to convert that into a dictionary with a, b and c being the key and 0, 1, and 3 being their respective values (converted to int). Obviously I can do this: list = string.split() dic = {} for entry in list: key, val = entry.split('=') dic[key] = int(val) But I don't really like that for loop, It seems so simple that you should be able to convert it to some sort of list comprehension expression. And that works for slightly simpler cases where the val can be a string. dic = dict([entry.split('=') for entry in list]) However, I need to convert val to an int on the fly and doing something like this is syntactically incorrect. dic = dict([[entry[0], int(entry[1])] for entry.split('=') in list]) So my question is: is there a way to eliminate the for loop using list comprehension? If not, is there some built in python method that will do that for me?

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Leave entity intact in XML + XSLT

- by Kuroki Kaze

I transform XML to (sort of) HTML with XSL stylesheets (using Apache Xalan). In XML there can be entities like —, which must be left as is. In beginning of XML file I have a doctype which references these entities. What should I do for entity to be left unchanged? <!DOCTYPE article [ <!ENTITY mdash "—"> ]> gives me SAXParseException: Recursive entity expansion, 'mdash' when encountering &mdash in XML text.

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Extending ClaimsIdentity in MVC3

- by Steoates

I've got my claims set-up with MVC3 using azure and everything is going well. What I need to do now is extend the Claims Identity that's in the current thread / http context and add my own information (DOB, Address.. that sort of stuff) so my question is - where is the best place to do this? any examples would be great.. I presume that when the user is authenticated id then have to go to the DB and pull back the relevant record for the user then add it to the custom Claims Identity object? cheers. ste.

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Finding cities close to one another using longitude and latitude

- by Jamie

Each user in my db is associated to a city (with it's longitude and latitude) How would I go about finding out which cities are close to one another? i.e. in England, Cambridge is fairly close to London. So If I have a user who lives in Cambridge. Users close to them would be users living in close surrounding cities, such as London, Hertford etc. Any ideas how I could go about this? And also, how would I define what is close? i.e. in the UK close would be much closer than if it were in the US as the US is far more spread out. Ideas and suggestions. Also, do you know any services that provide this sort of functionality? Thanks

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LINQ in SQLite for Windows store app does not have 'ThenBy' to order by multiple columns

- by user1131657

I have a Windows 8 store application and I'm using the latest version on SQLite for my database. So I want to return some records from the database and I want to order them by more that one column. However SQLite doesn't seem to have the ThenBy statement? So my LINQ statement is below: from i in connection.Table<MyTable>() where i.Type == type orderby i.Usage_Counter // ThenBy i.ID select i); So how do I sort by multiple columns in SQLite without doing another LINQ statement?

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Overcoming Inertia - How to Just Get Going on Stuff

- by kronoz

I wondered whether you guys could help me - I have a big problem with overcoming inertia, i.e. how to just get started on a project/work when you simply feel the inertia of not being in the right 'zone' to do work such that it really becomes pretty damn tough to actually get on with what you want to do. Forgive me quoting my blog post where I try to express the problem as best I can:- The problem is that it feels so damned difficult to exert the force required to shift from one mode to another, so much so that you find it almost inconceivable to do so at the time. You need to force yourself somehow, or at least find some sort of hack to trick yourself into it. Do you guys have any ideas/hacks as to how to overcome this? Thanks in advance, and hopefully the community feel this question is valid for stack overflow (I have set it community wiki due to its fairly subjective nature.)

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Edit PDF online and save and form data to server

- by Clowerweb

Hello, I have some PDF documents which are being displayed in the browser, with some fields already being pre-populated from the database using iTextSharp (we are running Windows Server 2008, IIS 7, SQL Server 2008, and ASP.NET 2.0/2.5 with C#). Our clients need to be able to fill in the remaining fields and save the PDF to the server. I have considered the following possibilities: 1.) Somehow using iTextSharp to parse the form fields, grab all the form data and save it to the database on submit. 2.) Adding a submit button to the PDF itself using LiveCycle with some sort of JS click event to save the FDF/XFDF/XDP/XML data either to the database or to a flat file on the server. I am currently unsure as to what the best approach would be, what would work, or how to implement any of these possible solutions, so any help would be greatly appreciated. Thanks!

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Ruby - Manipulating Time/DateTime by the Hour/Day?

- by viatropos

Where can I find some examples on how to manipulate the time objects by days/hours/etc? I would like to do this: time.now_by_hour #=> "Tue Jun 15 23 MST 2010" time.now_by_day #=> ""Tue Jun 15 MST 2010" time.now_by_hour - 4.weeks - 3.days #=> "Sat May 15 MST 2010" What is the recommended order of operations? The reason for this is I would like to run through lists of times and sort them by date to the hour, not to the minute and second.

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Find top N elements in a Multiset from Google Collections?

- by dfrankow

A Google Collections Multiset is a set of elements each of which has a count (i.e. may be present multiple times). I can't tell you how many times I want to do the following Make a histogram (exactly Multiset) Get the top N values from the histogram Examples: top 10 URLs, top 10 tags, ... What is the canonical way to do #2 given a Multiset? Here is a blog post about it, but that code is not quite what I want. First, it returns everything, not just top N. Second, it copies (is it possible to avoid a copy?). Third, I usually want a deterministic sort, i.e. tiebreak if counts are equal.

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