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• I'm working on a website that sells different artwork, what's the best way to handle different image

  - by ThinkingInBits

  I'm working on a website that will allow users to upload and sell their artwork in different sizes. I was wondering what the best way would be to handle the different file sizes automatically. A few points I was curious on: How to define different size categories (small, medium, large) in such a way that I'll be able to dynamically re-size images with proportional dimensions. Should I store actual jpegs of the different sizes for download? Or would it be easier to generate these different sizes for download on the fly My thumbnails will be somewhat larger than your average thumbnails, should I store a second 'thumbnail image' with the sites watermark overlaying it? Or once again, generate this on the fly? All opinions, advice are greatly appreciated!

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• Correctly Applying an Open Source License

  - by Johannes Rudolph

  My question consists of multiple points that are inherently related, I apologize for that. I tried splitting it up a little more, but I would keep repeating myself. What exactly is required to apply an open source license to a code base that is my Intellectual Property? A lot of Open Source projects include a full copy of the license somewhere in a root directory but do also have some sort of file header including a license description, disclaimer and a copyright notice. Is that really necessary or does it depend on the license type? If someone else contributes changes to this file, does he need to be named in the copyright notice too?

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• Is there a way to programmatically extract the feed of a podcast from the iTunes page?

  - by J. Pablo Fernández

  From an iTunes page, like http://itunes.apple.com/us/podcast/this-week-in-tech-mp3-edition/id73329404, is there a way to extract the corresponding feed address? In this case it would be http://leoville.tv/podcasts/twit.xml. I know that if you open on iTunes you can extract it manually, but I want to do it programmatically. There's a link to the website of the podcast, but it may not be accurate. In this case it points to a web site with 20 podcasts on it.

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• What parameters should I use in a Google Maps URL to go to a lat-lon?

  - by xpda

  I would like to produce a url for Google Maps that goes to a specific latitude and longitude. Now, I generate a url such as this: http://maps.google.com/maps?z=11&t=k&q=58 41.881N 152 31.324W The resulting map comes up with a round "A" balloon pointer, which seems to point to the nearest named object, and a green arrow, which points to the lat-lon. Sometimes, as in this example, the "A" pointer is centered and is far enough away that you cannot see the pointer to the lat-lon. (Zoom out to see both pointers in this example. The "A" pointer is in the center of Alaska, while the lat-long pointer is on Kodiak Island.) Are there some parameters I can use in the Google Maps URL that will produce a single pointer to a designated lat-lon? (This loads in a separate window. It is not embedded.)

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• What are the typical reasons Javascript developed on Firefox fails on IE?

  - by karlthorwald

  I developed some javascript enhanced pages that run fine on recent Firefox and Safari. I missed to check in Internet Explorer, and now I find the pages don't work on IE 6 and 7 (so far). The scripts are somehow not executed, the pages show as if javascript wasn't there, although some javascript is executed. I am using own libraries with dom manipulation, from YUI 2 I use YUI-Loader and the XML-Http-Request, and on one page I use "psupload", which depends on JQuery. I am installing Microsoft Script Editor from Office XP and will now debug. I will also write specific tests now. What are the typical failing points of IE? What direction I can keep my eyes open. I found this page, which shows some differences: http://www.quirksmode.org/compatibility.html Can you from your experience name some typical things I should look for first? I will also ask more questions here for specific tasks later, but for now I am interested in your experience why IE usually fails on scripts that run fine in Firefox

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• Twitter's Bootstrap 2.x popover callback can't focus on element

  - by mozgras

  I've modified bootstrap's popover function to include a callback which works great. But in the callback I cannot programmatically focus on the first form field. Strange, because I can manipulate other elements in the callback function as well as focus on the element at other points. Here's the code to add a callback which I got from another SO question (http://stackoverflow.com/a/14727204/1596547): var tmp = $.fn.popover.Constructor.prototype.show; $.fn.popover.Constructor.prototype.show = function () { tmp.call(this); if (this.options.callback) { this.options.callback(); } } Here's the popover code: $('#a-editor-btn').popover({ html: true, placement: 'bottom', callback: function(){ $('#a-form-point').focus(); //nothing happens console.log('hello'); // works . . }, content: $('#a-form').html() }).parent().delegate('button#insert-point-btn', 'click', function() { insertPoint(); }).delegate('.a-form','keypress', function(e) { if ( e.which == 13 ) { insertPoint(); } });

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• How to change Gmap markers color?

  - by user191687

  Hi! I've a custom google map with different points: Markers[0] = new Array(new GMarker(new GLatLng(45.0, 9.0)), "Location1", "<strong>Address Line</strong><br/>Some information"); Markers[1] = new Array(new GMarker(new GLatLng(45.0, 12.0)), "Location2", "<strong>Address Line</strong><br/>Some information"); etc. Simply I want to change the color of the markers from the default red. I.E. the 2nd blue. How to do this?

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• NSPredicateEditorRowTemplate for date comparison

  - by Dave DeLong

  I'm building an NSPredicateEditor, and I want the ability to do advanced date comparison. I realize that I can build an NSPredicateEditorRowTemplate with a rightExpressionType of NSDateAttributeType, but the predicates I want to build need to be much more advanced than that. For example, I need to basic comparison like: dateKeypath < aDate dateKeypath <= aDate dateKeypath = aDate dateKeypath != aDate dateKeypath > aDate dateKeypath >= aDate These basic comparisons are quite easy to achieve, and I have these working. However, I also need to do comparisons like: dateKeypath isInTheLast n days (or weeks, months, years) dateKeypath isNotInTheLast n days (or weeks, months, years) dateKeypath between aDate and anotherDate How can I achieve these sorts of comparisons? I understand that I'll need to create a custom NSPredicateEditorRowTemplate, but I haven't found any clear documentation on how to achieve something like this. EDIT Bonus points are available for also knowing how to make these comparisons a full date-time (year-month-day-hour-minute-second) comparison (as NSDateAttributeType only has year-month-day granularity).

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• Does a System.DirectoryServices.AccountManagement.Principal ever have a null GUID?

  - by Josh

  I have a situation where I need to store a globally unique identifier that points to an Active Directory user account. I'm leaning towards the Guid because it is easier to store than the Sid. According to the MSDN entry, the property (which is a Nullable), will always return null if the ContextType is set to "Machine." I don't need to worry about this because our ContextType will always be set to "Domain." My question is, will this property ever return null if the ContextType is "Domain"? In other words, will an account in an AD DS store always have a Guid?

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• ArrayBlockingQueue - How to "interrupt" a thread that is wating on .take() method

  - by bernhard

  I use an ArrayBlockingQueue in my code. Clients will wait untill an element becomes available: myBlockingQueue.take(); How can I "shutdown" my service in case no elements are present in the queue and the take() ist wating indefenitely for an element to become available? This method throws an InterruptedException. My question is, how can I "evoke" an Interrupted Exception so that take() will quit? (I also tought about notify(), but it seems I doesnt help here..) I know I could insert an special "EOF/QUIT" marker Element but is this really the only solution? UPDATE (regarding the comment, that points to another question with two solutions: one mentioned above using a "Poisoning Pill Object" and the second one is Thread.interrupt(): The myBlockingQueue.take() is used NOT in a Thread (extending Thread) but rather implements Runnable. It seems a Runnable does not provide the .interrupt() method? How could I interrupt the Runnable? Million Thanks Bernhard

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• IE 8 html parsing error message.

  - by user48408

  I'm experiencing the problem outlined in this kb article. http://support.microsoft.com/kb/927917 . Sorry I can't hyperlink cos i don't have enough points! "This problem occurs because a child container HTML element contains script that tries to modify the parent container element of the child container. The script tries to modify the parent container element by using either the innerHTML method or the appendChild method." The problem I'm having diagnosing the source of my problem is 2 fold: 1) This is only happening on some client machines (All are running IE8) and not others. How/Why only some? 2) I don't have any scripts which modify the innerHTML or call appendChild on any dom elements. I do have server side code which modify properties on asp .net server controls. (Essentially all thats happening is a panel control with some more controls is being made visbile or invisible on a button click), would these in turn then set the innerHTML property of the client rendered control(?)

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• How do I pass a parameter from the select list into a function for joining a linq query?

  - by Ryan ONeill

  I have a query that can be summarised in SQL as follows; Select S.StockCode From StockToCheck As S Inner Join GetPOSStock(S.StockCode) As C On S.StockCode = C.StockCode; I'm trying to do the same in Linq but it seems I cannot pass a parameter to the function I am joining on as it has not been parsed by Linq. I imagine it would look like this (vb); Dim x = From S In StockToCheck Join C In GetPOSStock(S) On S Equals C.ProductCode Where the S var is a list of strings. This gives the error 'S' is not declared and points to the S in the function call / join (GetPOSStock). So it does not seem possible to do this in Linq, can anyone confirm? Thanks in advance Ryan

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• gdb stack strangeness

  - by aaa

  Hi I get this weird backtrace (sometimes): (gdb) bt #0 0x00002b36465a5d4c in AY16_Loop_M16 () from /opt/intel/mkl/10.0.3.020/lib/em64t/libmkl_mc.so #1 0x00000000000021da in ?? () #2 0x00000000000021da in ?? () #3 0xbf3e9dec2f04aeff in ?? () #4 0xbf480541bd29306a in ?? () #5 0xbf3e6017955273e8 in ?? () #6 0xbf442b937c2c1f37 in ?? () #7 0x3f5580165832d744 in ?? () ... Any ideas why i cant see the symbols? Compiled with debugging syms of course. The same session gives symbols at other points.

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• Create a Sin wave line with Processing

  - by Nintari

  Hey everybody, first post here, and probably an easy one. I've got the code from Processing's reference site: float a = 0.0; float inc = TWO_PI/25.0; for(int i=0; i<100; i=i+4) { line(i, 50, i, 50+sin(a)*40.0); a = a + inc; } http://processing.org/reference/sin_.html However, what I need is a line that follows the curve of a Sin wave, not lines representing points along the curve and ending at the 0 axis. So basically I need to draw an "S" shape with a sin wave equation. Can someone run me through how to do this? Thank you in advance, -Askee

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• glDrawElements allocating memory and not releasing it

  - by Joshua Weinberg

  Using OpenGLES 1.1 on the iPhone 3G (device, not simulator), I do normal drawing fun. But at points during the run of the application I get giant memory spikes, after a lot of digging with instruments I have found that it is glDrawElements that is grabbing the memory. The buffer being allocated is 4 meg, which to me means its loading a texture into RAM, which I guess could be valid, but its never releasing this buffer, and is allocating multiple of them. How do I make sure that these buffers that GL is creating get destroyed, instead of just hanging around?

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• What is the Simplest Possible Payment Gateway to Implement? (using Django)

  - by b14ck

  I'm developing a web application that will require users to either make one time deposits of money into their account, or allow users to sign up for recurring billing each month for a certain amount of money. I've been looking at various payment gateways, but most (if not all) of them seem complex and difficult to get working. I also see no real active Django projects which offer simple views for making payments. Ideally, I'd like to use something like Amazon FPS, so that I can see online transaction logs, refund money, etc., but I'm open to other things. I just want the EASIEST possible payment gateway to integrate with my site. I'm not looking for anything fancy, whatever does the job, and requires < 10 hours to get working from start to finish would be perfect. I'll give answer points to whoever can point out a good one. Thanks!

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• Any reason not to always log stack traces?

  - by Chris Knight

  Encountered a frustrating problem in our application today which came down to an ArrayIndexOutOfBounds exception being thrown. The exception's type was just about all that was logged which is fairly useless (but, oh dear legacy app, we still love you, mostly). I've redeployed the application with a change which logs the stack trace on exception handling (and immediately found the root cause of the problem) and wondered why no one else did this before. Do you generally log the stack trace and is there any reason you wouldn't do this? Bonus points if you can explain (why, not how) the rationale behind having to jump hoops in java to get a string representation of a stack trace!

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• problem in interceptor executing before action in struts2

  - by vivmal

  Hi All, I am working on struts2. I have an interceptor that executes before my action claas. Now when I submit on a jsp page control goes to interceptor and after some processing there the control goes to action class. This complete flow is running well. But I found two things – 1) Control does not go to action-validation.xml before going to action class. 2) Its not getting the values of textfield or etc that uses has entered into jsp page before submitting. Can anyone tell me how to find solution for these two points. Thanks in advance.

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• Arrays/Lists and computing hashvalues (VB, C#)

  - by Jeffrey Kern

  I feel bad asking this question but I am currently not able to program and test this as I'm writing this on my cell-phone and not on my dev machine :P (Easy rep points if someone answers! XD ) Anyway, I've had experience with using hashvalues from String objects. E.g., if I have StringA and StringB both equal to "foo", they'll both compute out the same hashvalue, because they're set to equal values. Now what if I have a List, with T being a native data type. If I tried to compute the hashvalue of ListA and ListB, assuming that they'd both be the same size and contain the same information, wouldn't they have equal hashvalues as well? Assuming as sample dataset of 'byte' with a length of 5 {5,2,0,1,3}

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• How do I echo out something different when reached last row?

  - by Josh Brown

  I am wanting to not echo out the comma at the end of the echo after the last row. How can I do that? Here is my code: <?php header("Content-type: application/json"); echo '{"points":['; mysql_connect("localhost", "user", "password"); mysql_select_db("database"); $q = "SELECT venues.id, venues.lat, venues.lon, heat_indexes.temperature FROM venues, heat_indexes WHERE venues.id = heat_indexes.venue_id"; $res = mysql_query($q) or die(mysql_error()); while ($point = mysql_fetch_assoc($res)) { echo $point['lat'] . "," . $point['lon'] . "," . $point['temperature'] . ","; } mysql_free_result($res); echo ']}'; ?>

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• GCC/XCode equivalent of _CrtCheckMemory?

  - by Chris Becke

  When dealing with random memory overwrites, in MSVC it is possible to validate the state of the heap at various points with a call to _CrtCheckMemory, and know with at least a small level of confidence that the code up until the check was not responsible for any errors that might cause new or malloc to fail later. In XCode, whats the equivalent way to try and box in a memory overwrite? All I have at the moment is a random failure of a call to new, somewhere deep in the bowels of some code with no real idea of how long the code has been running with a corrupt heap up until that point.

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• Drawing bezier curve with limited subdivisions in OpenGL

  - by xEnOn

  Is it possible to tell OpenGL to draw a 4 degree (5 control points) bezier curve with 10 subdivisions? I was trying with this: point ctrlpts[] = {..., ..., ..., ...}; glMap1f(GL_MAP1_VERTEX_3, 0, 1, 3, 5, ctrlpts); glBegin(GL_LINE_STRIP); for (i = 0; i <= 30; i++) glEvalCoord1f((GLfloat) i/30.0); glEnd(); But this just draws the curve nicely. I am thinking that I want the algorithm inside the bezier curve to draw only until 10 subdivisions and then stop. The line should look a little facet.

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• Pass Value between MDI Child in WinForm using C#

  - by abhilashca

  I have an MDI Parent, containing a MenuStrip. When I click on one of the Menu, two Child Forms are displayed simultaneoulsy. I have a TextBox and a Send Button on one of my ChildForm. When I type-in something in that TextBox and Click the Send Button, I need to show that value in the TextBox of my Second Child Form. What I had done is, I wrote a Public Function in the Second Child Form and tried to invoke it by creating an object of Second Form, on the Send Button click event. When I put break points, in that Public Function, I find that the control is flowing through that Public function on cliking the Send button. But the passed value is not displayed. And, I know that is not the standard way to do that. Any sample script for help? Thanks.

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• Microsoft chart

  - by user222820

  hi there i am writing a program in c# windows app and i use the microsoft chart component i have 100 string in an array and 100 double in an array and i wanna draw a chart with these arrays but i have a problem it draws chart with 5 or 6 column what shoud i do with this problem string[] dates = new string[100]; double[] values = new double[100]; for (int i = 0; i <= 99; i++) { dates[i] = "1/1/138" + i.ToString(); values[i] = i; } s.Series[0].Points.DataBindXY(dates, values);

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• How can I explain to a programmer that CSS positioning has many benefits over table based layouts?

  - by Pat

  I have a friend who wishes to work as a freelance web developer, but insists that tables are the way forwards for layouts. Several points he maintains in favour of tables: 1 This is what was taught at the beginning of 10 years of programming & computer science degrees. 2 Large companies use tables to achieve 'technical' things. 3 It saves time I have coded him some examples of CSS exactly matching table based layouts, and provided many links to articles explaining SEO and accessibility benefits. From the perspective of a client, I have been explaining to him that I wouldn't hire someone using outdated methods as their main strategy for layout. As he is my friend and I wish him every success, I believe it is important for him to gain the best start when pitching for work. The question again: How can I explain to a programmer that CSS positioning has many benefits over table based layouts?

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