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• Java and C#, how close are they?

  - by prosseek

  I've been using C/C++ and Python pretty seriously, but I now I see that a lot of new programming books use Java or C# as examples. I don't think I'll use Java or C# for the time being, but I guess I have to study one of the languages (or both of them) in order to read and understand the books. How similar Java and C#? If I learn Java, is learning C# almost free? Or vice versa? If I have to choose only one of the two languages, which would be better? Which has wider coverage in terms of programming language?

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• How to retarget the scroll wheel in VB.Net?

  - by Orborde

  I have a form in VB.Net with Autoscroll enabled and several ComboBoxes within it. When I click on a ComboBox, I can use the mouse wheel to scroll through options, but I cannot deselect the ComboBox (by clicking off it on a blank portion of the parent form) in order to return to scrolling the parent form. This makes navigation in the form annoying, as I instinctively click off the control and flip the scroll wheel, causing the ComboBox to change selections instead of moving the parent form. Is there a way to make this work in the intuitive way I expect it to, or do I have some conceptual confusion that makes this the wrong question to ask?

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• Phusion Passenger on Ubuntu not seeing plugin in vendors directory

  - by armyofgnomes

  Phusion Passenger, running on Ubuntu Hardy Heron, is bombing on a require 'lingua/en/readability'. The plugin is installed in the plugins directory and works fine with script/server, just not Passenger. Error Message: source file that the application requires, is missing. * It is possible that you didn't upload your application files correctly. Please check whether all your application files are uploaded. * A required library may not installed. Please install all libraries that this application requires. Further information about the error may have been written to the application's log file. Please check it in order to analyse the problem. Error message: no such file to load -- lingua/en/readability (MissingSourceFile)

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• MySQL configuration that allows for locking many tables?

  - by Floyd Bonne

  I need to do a MySQLDump on a DB with ~700 tables and when I try with my current configuration, I get an error: mysqldump: Got error: 1016: Can't open file: './my_db/content_node_field_instance.frm' (errno: 24) when using LOCK TABLES Searching around I've found that this happens because it tries to lock all tables and fails because they are "too many". I know I can try lock-tables=no and get a dump, but this way my DB might be in an inconsistent state. So, does anyone know what is the MySQL configuration setting I need to change in order to be able to do the locking I need? I'm running 5.1.37-1ubuntu5.1 with MyISAM. Thanks!

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• horizontally scrollable table column

  - by Alexandru Cucu

  Hello, I would need to build a html table that has a horizontally scrolable column. The scroll should be placed in the column's header. My question first question is: do you know any jquery plug-in that is able to do this? My second question: is this possible using a single table. I've heard that in order to do this you need to use multiple synchronized tables that look like a single one from the user's perspective. Any ideea/advice would be welcomed. Thank you.

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• Getting the median of 3 values using scheme's

  - by kristian Roger

  The problem this time is to get the median of three values (easy) I did this: (define (med x y z) (car(cdr(x y z))) and it was accepted but when testing it: (med 3 4 5) I get this error: Error: attempt to call a non-procedure (2 3 4) And when entering letters instead of number i get: (md x y z) Error: undefined varia y (package user) Using something besides x y z I get: (md d l m) Error: undefined variable d (package user) the question was deleted dont know how anyway write a function that return the median of 3 values Sorry for editing the question I got that I should put the values in order first not just a sill car and cdr thing so I did so 33> (define (med x y z) (if(and( (<x y) (<y z) y if(and( (<y x) (<x z) x z))))) Warning: invalid expression (if (and< (<x y) (<y z) y if (and ((<y x) (<x z) x z)))) but as u see Im getting a warning so what is wronge ?

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• How do I find the unix timestamp for the start of the next day in php?

  - by zeckdude

  I have a unix timestamp for the current time. I want to get the unix timestamp for the start of the next day. $current_timestamp = time(); $allowable_start_date = strtotime('+1 day', $current_timestamp); As I am doing it now, I am simply adding 1 whole entire day to the unix timestamp, when instead I would like to figure out how many seconds are left in this current day, and only add that many seconds in order to get the unix timestamp for the very first minute of the next day. What is the best way to go about this?

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• What is the length of time to send a list of 200,000 integers from a client's browser to an internet

  - by indiehacker

  Over the connections that most people in the USA have in their homes, what is the approximate length of time to send a list of 200,000 integers from a client's browser to an internet sever (say Google app engine)? Does it change much if the data is sent from an iPhone? How does the length of time increase as the size of the integer list increases (say with a list of a million integers) ? Context: I wasn't sure if I should write code to do some simple computations and sorting of such lists for the browser in javascript or for the server in python, so I wanted to explore this issue of how long it takes to send the output data from a browser to a server over the web in order to help me decide where (client's browser or app engine server) is the best place for such computations to be processed.

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• Need a way for users to enter data while offline and re-submit it when back online

  - by crankharder

  As part of a larger webapp, I want to build functionality that allows a user to enter data while offline -- and then send that data back to my site when they have a connection again The parts that, to me, are missing ar Saving a certain set of data in their browser Saving a form that allows them to enter data using form from step#2 to update data from step#1 getting data out of the local data store and sending it back to the server I would like to keep this entirely within the browser, so... Does HTML5 meet some (or all) of those goals as it's currently implemented in webkit/ff3? If not,what technologies should I start looking into in order to accomplish all of the above.

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• SQL-query task, decision?

  - by Sirius Lampochkin

  There is a table of currencies rates in MS SQL Server 2005: ID | CURR | RATE | DATE 1   | USD   | 30      | 01.10.2010 3   | GBP   | 45      | 07.10.2010 5   | USD   | 31      | 08.10.2010 7   | GBP   | 46      | 09.10.2010 9   | USD   | 32      | 12.10.2010 11 | GBP   | 48      | 03.10.2010 Rate are updated in real time and there are more than 1 billion rows in the table. It needs to write a SQL-query, wich will provide latest rates per each currency. My decision is: SELECT c.[id],c.[curr],c.[rate],c.[date] FROM [curr_rate] c, (SELECT curr, MAX(date) AS rate_date FROM [curr_rate] GROUP BY curr) t WHERE c.date = t.rate_date AND c.curr = t.curr ORDER BY c.[curr] ASC Is it possible to write a query without sub-queries and join's with derived tables?

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• Using TFSBuild to publish ClickOnce files that include prerequisites

  - by icancsharp

  I have declared an MSBuild tag in my TFSBuild project in order to publish ClickOnce files for my project. WSE 3.0 and .Net 3.0 are both pre-requisites for the application, so in Visual Studio I have ticked those as pre-requisites. When I build from Visual Studio, it creates a setup.exe file that I can publish to my web site. When you browse to this setup.exe file it installs WSE3.0 and .Net 3.0 and then continues to install my application, which works well. If I get TFS to create the click once files using the MSBuild tag in the TFSBuild file, it creates the setup.exe file, which I can publish to my website in the same way (along with all the other ClickOnce files). When I browse to setup.exe now, however, the prerequisites don't get installed and therefore my program does not run. Does anyone know how to get TFS to build a correct setup.exe file that properly bootstraps my prerequisites?

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• Setting Application.Handle as a top-level window' owner

  - by Serg

  I want the main form to appear above some other application forms (in z-order), so I override CreateParams method for these forms as follows: procedure TForm3.CreateParams(var Params: TCreateParams); begin inherited; Params.WndParent:= Application.Handle; end; I know the Application.Handle was the top-level windows' owner before Vista (and Delphi 2007). What is wrong with it in Vista (and Windows 7)? What potential problems may arise if I set Application.Handle as a top-level window owner?

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• newbie trying to write url rewite in .htaccess file

  - by user297975

  My site was under example.com/waha/ Now I move the site right under the root example.com I want to 301 redirect all the old links like example.com/waha/notice/5803 to example.com/notice/5803 How can I do it? My current .htaccess file is below. <IfModule mod_rewrite.c> RewriteEngine On # NOTE: change this to your actual StatusNet path; may be "/". RewriteBase / RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule (.*) index.php?p=$1 [QSA,L] </IfModule> <FilesMatch "\.(ini)"> Order allow,deny </FilesMatch> Options -Indexes

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• Document: How do I include a random fragment from another document

  - by NXT

  I have a word document that I am converting to docbook. This word document has short sections that are quoted from another document. I thinking that I should use a blockquote or sidebar to contain the quoted document. But how do I go about making random headings in non sequential order? For example I might be quoting a section of a document that looks like this: -------------------------------------- B. Damage Assessment blah...paragraphs B.1 Responsibilities. some stuff... B.2 Authority some more stuff... -------------------------------------- Those headings are totally unrelated to the flow of the containing document. Is this an appropriate place to use the bridgehead element?

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• Unable to save to wincache from cakePHP shell

  - by Phillaf

  I'm trying to retrieve the weather from wunderground.com through their API, and store it in wincache. For testing purposes I made this function in the News model: public function updateWeather(){ $results = file_get_contents('http://api.wunderground.com/api/**api_key**/conditions/q/CA/Montreal.json'); $results = json_decode($results); return Cache::write('weather', $results); } It works fine when I call this from the controller. However, I can't figure why that same function doesn't work when called from the console. I made this shell in order to eventually add this to windows task scheduler. class WeatherShell extends AppShell { public $uses = array('News'); public function main() { $this->News->updateWeather(); } } When running this, I see that $results is correctly populated. I get 'true' from Cache::write(), however, I get 'false' when trying to read. What subtlety am I missing?

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• [as3] list cellRenderer

  - by lemon

  I'm quite new with as3 via cs4 so please bear with me. I'm trying to make a phone book type list that displays the users name, cellnumber and possible a delete button. --- Bob 09XXXXXXXXX delete --- Sussie 09XXXXXXXXX delete --- Johnny 09XXXXXXXXX delete --- I've tried making a list and added to it a XML dataprovider <profiles> <profile> <label>Bob</label> ... </profile> It'll then display a list of names Bob Sussie Johnny But what do I have to do in order to get it print like fig 1? I know that it has something to do with CellRender but I can't seem to find any decent examples in Google.

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• JTable.setRowHeight prevents me from adding more rows

  - by Brent Parker

  I'm working on a pretty simple Java app in order to learn more about JTables, TableModels, and custom cell renderers. The table is a simple table with 8 columns only with text in them. When you click on an "add" button, a dialog pops up and lets you enter the data for the columns. Now to my problem. One of the columns (the last one) should allow for multiple lines of text. I'm already putting HTML into the field, but it is not wrapping. I did some research and looked into JTable#setRowHeight(). However, once I use setRowHeight, I can no longer add rows to the table. The data is put into the table model, but it does not show in the table. If I remove the setRowHeight line, then it adds data just fine. Is there another step to adding data to my data model that I'm missing? Thanks a lot!

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• Limiting the Amount of Tags for Acts as Taggable On

  - by bob

  Hello, I am wondering how to limit the amount of tags, the tag_cloud function returns for this plugin. http://github.com/collectiveidea/acts-as-taggable-on Also, I would like to know how to order it so that it orders the tags by the highest count. So the most popular are at the top. I tried to do @tags = Post.tag_counts_on(:tags, :limit = 5) but that did not work. Controller: class PostController < ApplicationController def tag_cloud @tags = Post.tag_counts_on(:tags) end end View: <% tag_cloud @tags, %w(css1 css2 css3 css4) do |tag, css_class| %> <%= link_to tag.name, { :action => :tag, :id => tag.name }, :class => css_class %> <% end %> Thanks!

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• Are there any differences between SQL Server and MySQL when it comes to preventing SQL injection?

  - by Derek Adair

  I am used to developing in PHP/MySQL and have no experience developing with SQL Server. I've skimmed over the PHP MSSQL documentation and it looks similar to MySQLi in some of the methods I read about. For example, with MySQL I utilize the function mysql_real_excape_string(). Is there a similar function with PHP/SQL Server? What steps do I need to take in order to protect against SQL injection with SQL Server? What are the differences between SQL Server and MySQL pertaining to SQL injection prevention? also - is this post accurate? is the escape string character for SQL Server a single quote?

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• How is schoolbook long division an O(n^2) algorithm?

  - by eSKay

  Premise: This Wikipedia page suggests that the computational complexity of Schoolbook long division is O(n^2). Deduction: Instead of taking "Two n-digit numbers", if I take one n-digit number and one m-digit number, then the complexity would be O(n*m). Contradiction: Suppose you divide 100000000 (n digits) by 1000 (m digits), you get 100000, which takes six steps to arrive at. Now, if you divide 100000000 (n digits) by 10000 (m digits), you get 10000 . Now this takes only five steps. Conclusion: So, it seems that the order of computation should be something like O(n/m). Question: Who is wrong, me or Wikipedia, and where?

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• Setting Priorities on Buttons

  - by JONY

  Hello Android Developers, I am trying to figure out how to set priorities on imagebutton. I want to have a layout with a bunch of Icon or buttons that can be selected either by touch, radio, or checked box. As these images are selected they are set on queue to be displayed in order of Precedence. (that is to be pre-determined). The images are displayed once the main action button is touched. Any help will be greatly appreciated. Thank you,

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• Making GWT application crawlable by a search engine.

  - by Philippe Beaudoin

  I want to use the #! token to make my GWT application crawlable, as described here: http://code.google.com/web/ajaxcrawling/ There is a GWT sample app available online that uses this, for example: http://gwt.google.com/samples/Showcase/Showcase.html#!CwRadioButton Will serve the following static webpage to the googlebot: http://gwt.google.com/samples/Showcase/Showcase.html?_escaped_fragment_=CwRadioButton I want my GWT app to do something similar. In short, I'd like to serve a different flavor of the page whenever the _escaped_fragment_ parameter is found in the URL. What should I modify in order for the server to serve something else (a static page, or a page dynamically generated through a headless browser like HTML Unit)? I'm guessing it could be the web.xml file, but I'm not sure. (Note: I thought of checking the Showcase app provided with the GWT SDK, but unfortunately it doesn't seem to support serving static files on _escaped_fragment_ and it doesn't use the #! token..)

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• Implementing a "special" Access database to Expression Web

  - by Newbie

  I have just got an answer to my question about combining the result of a SQL. This was done with "ConcatRelated". Now I want to implement this in Expression Web 3. The SQL's I used in Access: SELECT land.id, land.official_name, vaksiner.vaksiner FROM land INNER JOIN (vaksiner INNER JOIN land_sykdom ON vaksiner.id = land_sykdom.sykdom) ON land.kort = land_sykdom.land ORDER BY land.official_name; and SELECT DISTINCT id, official_name, ConcatRelated("vaksiner","qryVaksinerRaw","id = " & [id]) AS vaksiner FROM qryVaksinerRaw; The last is saved as vaksine_query This is the SQL that I want to add to Expression Web: SELECT vaksine_query.id, vaksine_query.official_name, vaksine_query.vaksiner FROM vaksine_query WHERE vaksine_query.id="?"; Expression Web gives me the error message "Undefined function 'ContactRelated' in expression.

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• Managing multiple .NET languages in a web application

  - by tomfanning

  I am part of a development team building a new ASP.NET 3.5 web application. Two of us are C# coders, and the other is a VB.NET coder. I know that we can mix languages on a per-project basis, and one can build classes in one language that inherit from classes written in the other language in a different project (which we are already doing), but I can see us getting into a situation where we might well end up with cyclic dependencies between our various project DLLs. Other than simply having a high number of projects (more seperation of concerns into more libraries), how have you managed this situation on your own projects? Note - I believe this question to be different enough from the only similar match I could find (this one) on the basis that we are not wanting to use different languages in order to take advantage of their specific features per se, but rather to make use of what developer resource is available to us (i.e. one dev just happens to be VB.NET only).

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• Why does null need to be casted?

  - by BlueRaja The Green Unicorn

  The following code does not compile: //int a = ... int? b = (int?) (a != 0 ? a : null); In order to compile, it needs to be changed to int? b = (a != 0 ? a : (int?) null); Since both b = null and b = a are legal, this doesn't make sense to me. Why does null need to be casted, and why can't we simply cast the whole expression (which I know is legal in other cases)?

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