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• Rails layout: 2 cols cache and content_for..

  - by Totty

  Hy, I have a layout that has 2 cols and in every view i have: content_for :main_col and content_for :side_col in some parts of the site, the side_col is always the same and how do i do that being DRY? partial render? i dont think is so good. then it comes to cache.. the content_for is not good to cache... you have better ideias on how to implement this?thanks

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• fixed verticle positioning of css within an iframe

  - by Jake Rider

  I am trying to get my bottom header to stick to the bottom of the screen inside of my iframe application and have it always appear in view for the user even when the page is scrolling.

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• Is there a convention, when using Java RMI, to use the dollar sign $ in a variable name?

  - by Thomas Owens

  I realize that it is a valid part of a variable name, but I've never seen variable names actually use the symbol $ before. The Java tutorial says this: Additionally, the dollar sign character, by convention, is never used at all. You may find some situations where auto-generated names will contain the dollar sign, but your variable names should always avoid using it. However, since this is geared toward Java beginners, I'm wondering if in the distributed world, the $ lives on with a special meaning.

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• How do URL shortening services make money?

  - by Rakesh Juyal

  Yesterday i got to know about one more URL shortening service Saf.li. I think there are hundreds of websites offering such service. I always wonder how do such sites make money? After all they need money to host their data and code. Also, i really don't understand why techcrunch said this:- http://techcrunch.com/2009/03/30/if-bitly-is-worth-8-million-tinyurl-is-worth-at-least-46-million/ Is there any one who can explain me this?

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• DataGridView's top left cell value is not displayed.

  - by Spike

  I have a DataGridView, without visible row or column headers, and bound to a BindingList. No matter what I try the top left cell (Rows[0].Cells[0]) is always empty. The cell's Visible property is true, but it never displays its contents. If I make some rows and columns invisible, it's still the top left of the visible cells that isn't displayed.

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• Common Wpf pitfalls

  - by Patrick Klug

  I want to gather a list of WPF pitfalls. Issues with WPF that are not that well known and either have some serious design consequences or some major inconveniences. One topic per answer. List: Mouse.GetPosition() does not always return a correct value. The Wpf layout recursion limit is hard coded to 255.

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• Linqify this: Aggregate a subset of a list

  - by JMarsch

  Suppose I have a list or array of items, and I want to sum a subset of the items in the list. (in my case, it happens to always be a sequential subset). Here's the old-fashioned way: int sum = 0; for(int i = startIndex; i <= stopIndex; i++) sum += myList[i].TheValue; return sum; What's the best way to linqify that code?

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• converting an int to char*

  - by Alexander

  This is a very very basic question and I know one way is to do the following: char buffer[33]; itoa(aq_width, buffer,10); where aq_width is the int, but then I can't guarantee what size of buffer I would need in order to do this... I can always allocate a very large buffer size, but that wouldn't be very nice... any other pretty and simple way to do this?

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• do's and don'ts for writing mysql queries

  - by nik

  One thing I always wonder while writing query is that am I writing most optimized query or not? I know certain things like: 1) using SELECT field1, filed2 instead of SELECT * 2) Giving proper indexes to the tables but I am sure there are more things that should be kept in mind for writing queries, since most of the database can only grow more and optimal query will help gr8 in execution time, Can u share some tips and tricks on writing queries?

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• How do URL shortening service earn?

  - by Rakesh Juyal

  Yesterday i got to know about one more URL shortening service Saf.li. I think there are hundreds of websites offering such service. I always wonder how do such sites earn? After all they need money to host their data and code. Also, i really don't understand why techcrunch said this:- http://techcrunch.com/2009/03/30/if-bitly-is-worth-8-million-tinyurl-is-worth-at-least-46-million/ Is there any one who can explain me this?

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• FileUpload ASP.NET control not working under Windows 7

  - by YourMomzThaBomb

  I have a User Control that contains a System.Web.UI.WebControls.FileUpload control as well as a button to 'Submit'. When the button is clicked code similar to the following is executed: If FileUploadControl.HasFile Then 'Save the file and do some other stuff End If This code works just fine with Windows XP. However, if I run it from a Windows 7 64-bit machine using IE8 32-bit the HasFile property always returns false and nothing is saved?! Any suggestions/ideas would be greatly appreciated.

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• .NET application silently fails to start when assembly missing

  - by chiccodoro

  I have a .NET C# winforms application which works great on my machine, but if I try to run it on another machine, it doesn't start up. No error message, no crash message, no window - nothing. I've found that this always happens when a referenced assembly is missing. I guess this is .NET's general behavior and not specific to my app, is it? Is there any way to configure .NET or my application such that it spits out a "referenced assembly missing" like error message in such cases?

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• I want to scramble an array in PHP

  - by BRUL

  I want PHP to randomly create a multi-dimensional array by picking a vast amount of items out of predefined lists for n times, but never with 2 times the same. Let me put that to human words in a real-life example: i want to write a list of vegetables and meat and i want php to make a menu for me, with every day something else then yesterday. I tried and all i got was the scrambling but there were always doubles :s

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• SQL: Join vs. subquery

  - by Col. Shrapnel

  I am an old-school MySQL user and always preferred JOIN over sub-query. But nowadays everyone uses sub-query and I hate it, dunno why. Though I've lack of theoretical knowledge to judge myself if there are any difference. Well, I am curious if sub-query as good as join and there is no thing to worry about?

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• RSS2.0 + Publishing in Tomcat + Reading using Google-Ajax-API's

  - by Panther24

  I've published an RSS xml in my tomcat. When I hit the URL, like http://localhost:8080/Proj/rss.xml, I'm able to view the feed. But when I integrate it with Google Ajax Api, I always end up with "Feed could not be loaded." So to test, I downloaded an rss.xml file from a reputed site, put it into my tomcat server and hit the url and it should up, but again when I integrate it with Google's AJAX api, it doesn't load up. Any help!!

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• Rails 3 Nested Forms with datamapper

  - by jens freudenau

  i have two models: class MeetingPoint include DataMapper::Resource belongs_to :profile property :id, Serial property :lat, String end and class Profile include DataMapper::Resource has n, :meeting_points property :id, Serial property :distance, Text property :created_at, DateTime property :updated_at, DateTime end Now I create a form to edit the profile and the meeting_poing: = form_for @profile do |f| = f.text_field :distance = f.fields_for :meeting_points do |ff| = ff.text_field :lat = f.submit But when I want to save the values I get always the error: "undefined method `readonly?' for ["lat", "14.000"]:Array"

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• Position of SlidingDrawer handle?

  - by Christian Gawron

  I would like to have two overlapping SlidingDrawers (spanning the whole application window) with their handles side by side so that the user can open both drawers easily. However, it seems that the handle is always positioned horizontally centered (for a vertical SlidingDrawer) so that the handles collide. I tried both FrameLayout and RelativeLayout for the parent, but layout options like android:layout_alignRight seem to be ignored for the handles.

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• BoundsChecker shows incorrect memory leak message

  - by Prabhu

  Hello All, I'm using BoundsChecker9.1 with visual c++. I have a class class Sample{ public: vector(AnotherClass) x; }. When I run my program the BoundsChecker tool reports all push_back() calls such as S.x.push_back(AnotherClass()) as memory leak.. Wouldn't all the elements in vector x will always be deallocated when the Sample class goes out of scope? If so, any idea about why BoundsChecker is showing them as memory leak?

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• XNA - 2D Tile Lighting

  - by Cyral

  Im adding lighting to my 2D Tile based game. I found the link http://blog.josack.com/2011/07/xna-2d-dynamic-lighting.html useful, but the way its done it dosent support collision. What Id like is some help or links as I want one that can have -always lit up light points -collision (If the light ray hits a block, then dim the next block by whatever amount until its dark) Im a noob at this stuff, but ive been searching around for quite a while but no luck (I did find Catalin's tutorial, but it seemed abit advanced for me)

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• Any way to cache WAV files in IE?

  - by Dan Howard

  I'm seeing an issue with our web application. We have a few wave files which we can play (like ding.wav) and we have attempted to pre-load wave files but using Fiddler we're seeing that the WAV files are never cached like (js and css and image files). We always see an HTTP 200 instead of an HTTP 304. Any ideas on how to tell IE that it should cache wav files? We're inserting a div: <EMBED SRC='ding.wav' AUTOSTART='FALSE' HIDDEN='TRUE'>

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• What are your most useful C# extension methods?

  - by Edward Tanguay

  Extension methods continually make the C# I work with more readable and intuitive to program. I want to collect useful extension methods into a library so I always have them, such FormatWith by James Newton-King. What are the most useful extension methods that you use?

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• passing int into android activities

  - by Dawood Abbasi

  i pass int to next activity using this code Intent intent = new Intent(A.this, B.class); intent.putExtra("selectedType", i); startActivity(intent); and then receive this in activity B Intent intent = new Intent(); int i = intent.getIntExtra("selectedType", 0); Toast.makeText(getApplicationContext(), String.valueOf(i), Toast.LENGTH_LONG).show(); but when in this activity, it always display 0.

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• What defines writing PHP?

  - by cdburgess

  When writing PHP code for any given project, do you find you can write code off the top of your head? Or do you make multiple round trips to php.net? If it is the later, can you still be considered a good coder. This is a legitimate question as I find I have difficulty always remembering all of the functions that are available to me so I find I use php.net as a crutch. Is there anyway to improve this?

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• Accessing outside the memory allocated by the program. (Accessing other app's memory)

  - by Auxiliary

  Is there a way to access (read or free) memory chunks that are outside the memory that is allocated for the program without getting access violation exceptions. Well what I actually would like to understand apart from this, is how a memory cleaner (system garbage collector) works. I've always wanted to write such a program. (The language isn't an issue) Thanks in advance :)

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• Small questions for AJAX onreadystatechange

  - by Doug

  xmlhttp.onreadystatechange=function() { So this says onreadystatechange, invoke function(). Can I put parameters in function()? Second question, what does it mean when someone writes, xmlhttp.onreadystatechange=statechanged? Does that mean it will always be true or something?

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