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  • How can I create a collection of references in C#

    - by Jonathan Kaufman
    Ok I am having a cross language hiccup. In C# with it's great collections like List and I have: a Map class with properties of: List<byte[]> Images; List<Tile> Tiles; a Tile Class of: byte[] ImageData; int X; int Y; Now I want to add an image to the Map class and have the ImageData property of the Tile Classes to "reference" it. I have discovered I can't just assign it Images[0]. You can't have a reference to an object of a List. My fix was to create a Dictionary. Is this the best way or can I somehow have a "pointer" to a collection of objects?

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  • Changing <img src="XXX" />, js event when new image has finished loading?

    - by carillonator
    I have a photo gallery web page where a single <img src="XXX" /> element's src is changed (on a click) with javascript to show the next image—a poor man's ajax I guess. Works great on faster connections when the new image appears almost immediately. Even if it takes a few seconds to load, every browser I've tested it on keeps the old image in place until the new one is completely loaded. It's a little confusing waiting those few seconds on a slow connection, though, and I'm wondering if there's some javascript event that fires when the new image is done loading, allowing me to put a little working... animated gif or something up in the meantime. I know I could use AJAX for real (I'm using jQuery already), but this is such a nice and simple solution. Besides this lag, is there any other reason I should stay away from this approach to changing images? thanks.

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  • Creating a Custom UserControl TestContainer for Visual Studio

    - by AMissico
    I like to use the "UserControl TestContainer" that works great for testing a controls properties during design time. Yet it has limitations. Usually, I just create a Windows Form Application to test the control's run-time interface. It would be nice to combine the two phases. Today, I discovered that the test-container is defined in the project file as show below. What I like to do is create my own test-container and use it for my Windows Forms Control Library projects in Visual Studio 2008. I cannot find any specific documentation, and the documentation I found was related to MSTest and not helpful. Any help, suggestions, or research directions for implementing my own test-container? <ItemGroup> <Service Include="{94E38DFF-614B-4cbd-B67C-F211BB35CE8B}" /> </ItemGroup>

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  • How can I use offline access with the Facebook javascript SDK?

    - by Tony
    In the Facebook javascript api there is a login function in which you specify extended permissions: http://developers.facebook.com/docs/reference/javascript/FB.login One of these permissions is offline access. So I can save the facebook user's session key and assume it will not expire for a long time. The question I have is simple - how do I use the session key? I understand that the session key will last longer, but I don't understand how to use it in the Facebook API. For one of my products, a user must restart his/her browser and I would like to recognize them when they restart. The problem is that they are logged out of facebook, so they must login on my site again where I would rather just use offline access. Sample code would be great! Thanks

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  • App crashes when adding array data to table cells

    - by bassmandan
    I am trying to create a table view that loads a number of tweets into the table (one per cell etc). I am using NSXMLParser to get the information and have got as far as creating an array with the selection of tweets that I want. However, when I try to add them to the table cells, the app crashes on the line: cell.textLabel.text = cellValue; An NSLog before this shows in the console that the app is getting the correct data, so I am a bit stumped as to why this isn't working. This is the block of code that appears to be having the problem: - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]; } // Set up the cell... NSString *cellValue = [statuses objectAtIndex:indexPath.row]; NSLog(@"%@", cellValue); cell.textLabel.text = cellValue; return cell;} If it makes a difference, I am using ARC and the latest version of XCode. I'm still quite new to all this, so if I need to give some extra information, let me know. Thanks in advance. Edit: Backtrace gives the following: * thread #1: tid = 0x2003, 0x918a19c6 libsystem_kernel.dylib`__pthread_kill + 10, stop reason = signal SIGABRT frame #0: 0x918a19c6 libsystem_kernel.dylib`__pthread_kill + 10 frame #1: 0x9968ff78 libsystem_c.dylib`pthread_kill + 106 frame #2: 0x99680bdd libsystem_c.dylib`abort + 167 frame #3: 0x03c93e78 libc++abi.dylib`_Unwind_DeleteException frame #4: 0x03c9189e libc++abi.dylib`_ZL17default_terminatev + 34 frame #5: 0x0154df4b libobjc.A.dylib`_objc_terminate + 94 frame #6: 0x03c918de libc++abi.dylib`_ZL19safe_handler_callerPFvvE + 13 frame #7: 0x03c91946 libc++abi.dylib`std::terminate() + 23 frame #8: 0x03c92ab2 libc++abi.dylib`__cxa_throw + 110 frame #9: 0x0154de15 libobjc.A.dylib`objc_exception_throw + 311 frame #10: 0x013bdced CoreFoundation`-[NSObject doesNotRecognizeSelector:] + 253 frame #11: 0x01322f00 CoreFoundation`___forwarding___ + 432 frame #12: 0x01322ce2 CoreFoundation`_CF_forwarding_prep_0 + 50 frame #13: 0x0015168f UIKit`-[UILabel setText:] + 56 frame #14: 0x00003088 Twitter`-[TwitterViewController tableView:cellForRowAtIndexPath:] + 376 at TwitterViewController.m:131 frame #15: 0x000ace0f UIKit`-[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:withIndexPath:] + 494 frame #16: 0x000ad589 UIKit`-[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:] + 69 frame #17: 0x00098dfd UIKit`-[UITableView(_UITableViewPrivate) _updateVisibleCellsNow:] + 1350 frame #18: 0x000a7851 UIKit`-[UITableView layoutSubviews] + 242 frame #19: 0x00052301 UIKit`-[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 145 frame #20: 0x013bde72 CoreFoundation`-[NSObject performSelector:withObject:] + 66 frame #21: 0x01d6692d QuartzCore`-[CALayer layoutSublayers] + 266 frame #22: 0x01d70827 QuartzCore`CA::Layer::layout_if_needed(CA::Transaction*) + 231 frame #23: 0x01cf6fa7 QuartzCore`CA::Context::commit_transaction(CA::Transaction*) + 377 frame #24: 0x01cf8ea6 QuartzCore`CA::Transaction::commit() + 374 frame #25: 0x01d8430c QuartzCore`+[CATransaction flush] + 52 frame #26: 0x000124c6 UIKit`-[UIApplication _reportAppLaunchFinished] + 39 frame #27: 0x00012bd6 UIKit`-[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 1324 frame #28: 0x00021743 UIKit`-[UIApplication handleEvent:withNewEvent:] + 1027 frame #29: 0x000221f8 UIKit`-[UIApplication sendEvent:] + 68 frame #30: 0x00015aa9 UIKit`_UIApplicationHandleEvent + 8196 frame #31: 0x012a6fa9 GraphicsServices`PurpleEventCallback + 1274 frame #32: 0x013901c5 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53 frame #33: 0x012f5022 CoreFoundation`__CFRunLoopDoSource1 + 146 frame #34: 0x012f390a CoreFoundation`__CFRunLoopRun + 2218 frame #35: 0x012f2db4 CoreFoundation`CFRunLoopRunSpecific + 212 frame #36: 0x012f2ccb CoreFoundation`CFRunLoopRunInMode + 123 frame #37: 0x000122a7 UIKit`-[UIApplication _run] + 576 frame #38: 0x00013a9b UIKit`UIApplicationMain + 1175 frame #39: 0x0000239d Twitter`main + 141 at main.m:16 frame #40: 0x00002305 Twitter`start + 53 Debugging console shows this: 2012-04-08 10:10:05.084 Twitter[25309:f803] ( { text = "Have you shared the Shakedown yet? http://t.co/WHrIC9w7"; }, { text = "For all you closet rocknrollas pencil in Sat 12th May The Rebirth of Rock n Roll Party. Haywire Saint @ The Good... http://t.co/OXHKlLIV"; }, { text = "4 weeks today: Vocal tracks will be getting recorded at The Premises Studios"; }, { text = "Rehearsal tonight in preparation to some big recording next month!"; }, { text = "haywire saint 'great taste.' Tune. \n\nhttp://t.co/GKmu5Lna http://t.co/0fii55Hw"; }, { text = "Meeting up with an old roadie for The Cure today. oh the stories...... http://t.co/UeUYccme"; }, { text = "Satisfying day of programming today.. Haywire Saint app coming along nicely with the custom music player ready to rock 'n' roll!"; }, { text = "Happy Friday Everyone!"; }, { text = "We had a great time at The Premises Studios yesterday. We'll be back there before long :D x"; }, { text = "I posted a new photo to Facebook http://t.co/73qAnCvk"; } ) 2012-04-08 10:10:05.093 Twitter[25309:f803] { text = "Have you shared the Shakedown yet? http://t.co/WHrIC9w7"; } 2012-04-08 10:10:05.094 Twitter[25309:f803] -[__NSCFDictionary isEqualToString:]: unrecognized selector sent to instance 0x6877a50 2012-04-08 10:10:05.096 Twitter[25309:f803] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFDictionary isEqualToString:]: unrecognized selector sent to instance 0x6877a50' *** First throw call stack: (0x13bc052 0x154dd0a 0x13bdced 0x1322f00 0x1322ce2 0x15168f 0x3088 0xace0f 0xad589 0x98dfd 0xa7851 0x52301 0x13bde72 0x1d6692d 0x1d70827 0x1cf6fa7 0x1cf8ea6 0x1d8430c 0x124c6 0x12bd6 0x21743 0x221f8 0x15aa9 0x12a6fa9 0x13901c5 0x12f5022 0x12f390a 0x12f2db4 0x12f2ccb 0x122a7 0x13a9b 0x239d 0x2305) terminate called throwing an exception2012-04-08 10:10:05.924 Twitter[25309:f803] -[__NSCFConstantString count]: unrecognized selector sent to instance 0x5b30

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  • JavaScript - Textarea Selection

    - by brad
    The Problem I am working on an in-browser editor within a textarea. I have started looking for some information on dealing with textarea selection and found this jQuery plugin that does some simple manipulation. However, it doesn't explain what's going on. The Question Where can I find a good resource on Textarea Selection in JavaScript, preferably with a description of both pre-DOM3 and post-DOM30 scenarios? [Edit] In a great answer from Borgar, I have found several different places to start with contentEditable, selectionStart, and selectionEnd. I'll be looking into these things and posting any good tutorials I might find.

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  • How to improve performance

    - by Ram
    Hi, In one of mine applications I am dealing with graphics objects. I am using open source GPC library to clip/merge two shapes. To improve accuracy I am sampling (adding multiple points between two edges) existing shapes. But before displaying back the merged shape I need to remove all the points between two edges. But I am not able to find an efficient algorithm that will remove all points between two edges which has same slope with minimum CPU utilization. Currently all points are of type PointF Any pointer on this will be a great help.

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  • Scale image to completely fill bounding box

    - by Larsenal
    For instance, if I need to fill a bounding box that is 100px wide by 50px tall, the following input images would have the following behavior: 200w x 200h gets scaled down 50% and 25% gets chopped off the top and bottom. 200w x 100h gets scaled down 50% with no cropping. 100w x 200h gets is not scaled, but 75px get chopped off top and bottom. This seems like it'd be a common resizing function, but I haven't been able to track down an example of the algorithm. Will accept answer in any language including pseudo code. A link to a page with the answer is great too!

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  • Cannot call method 'wsl_wordpress_social_login'

    - by David Allen
    Hi I'm using a wordpress plugin to allow user to comment using facebook and twitter accounts. This is the page i am testing the plugin on http://blog.pcpal.co.uk/2012/03/london-underground-wi-fi-connectivity-due-within-months/ When i click the facebook icon its opens up a windows where i sign into facebook ad then directs to a blank pages which has a JS error see code below <html><head> <script> function init() { window.opener.wsl_wordpress_social_login({ 'action' : 'wordpress_social_login', 'provider' : 'Facebook' }); window.close(); } </script> </head> <body onload="init();"> </body></html> # Error is Uncaught TypeError: Cannot call method 'wsl_wordpress_social_login' of null If you can help then great.. Additional info Only seems to do it with chrome

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  • Garbage collection - manually wiping EVERYTHING!

    - by Glycerine
    I have been building a game for a while (nearly done) - But the game needs a replay button and its a big task. I know the GC is dreadful in flash, but I wanted to know if there is a way to wipe EVERYTHING as if the flash app has just begun. Clearing memory, game data - I haven't to worry about game loading as its not really heavy on data. Everything pretty much lives in a DataModel - but I fear if I just clear the all variables, I'll have pockets of orphaned memory. Any forwarding idea would be great. cheers guys.

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  • What online brokers offer APIs?

    - by Wilco
    So I'm getting really sick of E*TRADE and, being a developer, would love to find an online broker that offers an API. It would be great to be able to write my own trading tools, and maybe even modify existing ones. Based on my research so far, I've only found one option. Interactive Brokers offers a multi-language API (Java/C++/ActiveX/DDE) and has some fairly decent commission rates to boot. I want to make sure there aren't any other options out there I should be considering. Any ideas? Update: Based on answers so far, here's a quick list... Interactive Brokers Java C++ ActiveX DDE for Excel Pinnacle Trading C++ Perl VB.NET Excel MB Trading

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  • Is AMQP suitable as both an intra and inter-machine software bus?

    - by Bwooce
    I'm trying to get my head around AMQP. It looks great for inter-machine (cluster, LAN, WAN) communication between applications but I'm not sure if it is suitable (in architectural, and current implementation terms) for use as a software bus within one machine. Would it be worth pulling out a current high performance message passing framework to replace it with AMQP, or is this falling into the same trap as RPC by blurring the distinction between local and non-local communication? I'm also wary of the performance impacts of using a WAN technology for intra-machine communications, although this may be more of an implementation concern than architecture. War stories would be appreciated.

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  • Why would the assignment operator ever do something different than its matching constructor?

    - by Neil G
    I was reading some boost code, and came across this: inline sparse_vector &assign_temporary(sparse_vector &v) { swap(v); return *this; } template<class AE> inline sparse_vector &operator=(const sparse_vector<AE> &ae) { self_type temporary(ae); return assign_temporary(temporary); } It seems to be mapping all of the constructors to assignment operators. Great. But why did C++ ever opt to make them do different things? All I can think of is scoped_ptr?

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  • Visual Studio 2008's annoying auto-handling of block comments

    - by Dave
    I read that great post on Visual Studio 2008 annoyances, but didn't see this one. It drives me crazy. Now, I realize that some people use block comments like this for function documentation and the like: /* * * * */ But you know, this is VS2008 and now we can use ///. The only time I ever feel the need to use C-style commenting is when I have some junk or test code that I temporarily want to remove. It absolutely drives me nuts when I do the first /* and then when I add a line after the test code, it automatically puts a space after the * and I end up with this: * / . So then I end up always having to backspace to complete the block comment. I looked through all of the C# editor settings in the VS2008 IDE, and didn't find anything relevant. Does this drive anyone else here crazy, or am I turning into a codemudgeon?

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  • SQL Server - Compare int values in a select clause

    - by Russell
    This is what I thought would be a simple select clause, however the following is giving me grief! I am using SQL Server 2008. Basically I want to compare two integer values and return the boolean result in the select clause. Here is a simple example: DECLARE @A INT DECLARE @B INT SET @A = 1 SET @B = 2 SELECT @A = @B Currently the only output is "Command(s) completed successfully." Where I reasonably believe it is assigning @A to @B. I thought this would be simple but have not been able to achieve this. Any help would be great! Thanks

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  • Line break in the mailto onclick

    - by malaki1974
    The code below works great except the email has all the text on one line like this: Height: 60 | Diagonal: 123 | Width: 107 | Total SF: 13.92 | Cost Per SF: 450 | Total Cost: $6,264.00 I would like to break after each so it looks like this: Height: 60 Diagonal: 123 Width: 107 Total SF: 13.92 Cost Per SF: 450 Total Cost: $6,264.00 I tried \n \r \n\r etc but none of them work. Any ideas? <a class="emailText" href="mailto:?subject=Screen Dimensions" onclick="this.href='mailto:?subject=Screen Dimensions&body='+'Height: '+document.forms.myform.high.value+' | '+'Diagonal: '+document.forms.myform.diagonal.value+' | '+'Width: '+document.forms.myform.wide.value+' | '+'Total SF: '+document.forms.myform.sf.value+' | '+'Cost Per SF: '+document.forms.myform.csf.value+' | '+'Total Cost: '+document.forms.myform.tc.value">Email</a>

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  • Add UIView Above All Other Views, Including StatusBar

    - by Mike Stead
    I'm wanting to create a view (UIControl) which blocks all input and shows a UIActivityIndicatorView while authenticating a user. The UIActionSheet and UIAlertView both manage to add a black semi-transparent view over the top of all other views to block input and I'd like to do similar. I've tried adding my view to the top UIWindow in the [[UIApplication sharedApplication] windows] array, and while this does place it above the UIKeyboard if it's visible, it doesn't place it over the StatusBar (which makes sense). My next attempt was to extend UIAlertView, remove all of its subviews and set its layer.contents = nil, then add the ActivityIndicator as a subview. This works well, but I can't seem to kill the default bouncy transition of the UIAlertView when you call it to "show". Does anyone have any pointers towards the best way tackle this problem that gives me full control? Oh and I know blocking input is not great but I do ensure it's for a short period of time and it has the benefit of making it clear to the user that their action, which must complete for them to progress, is processing.

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  • Jquery show() not working in FF

    - by Andrea Zironda
    I have issues with FF & Jquery .show(). my website shows an embedded map from google in clicking a link.i have got a javascript function that handle this, in safari it works great.FF won't show the map. this is the js. function: function mostraPagina(nome){ if (nome='mappa'){ $('#mappa').load('contenuti/mappe/mappa_thiene.html'); $('#dark_background').show(600); $('#mappa').show(600); } } the embedded code from google maps is: <iframe width="425" height="350" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" src="http://maps.google.com/maps?f=q&amp;source=s_q&amp;hl=en&amp;geocode=&amp;q=Via+Murialdo,+4,+Thiene+italy&amp;sll=45.710686,11.475665&amp;sspn=0.002439,0.005676&amp;ie=UTF8&amp;hq=&amp;hnear=Via+Murialdo,+4,+36016+Thiene+Vicenza,+Veneto,+Italy&amp;ll=45.710222,11.475618&amp;spn=0.001219,0.002838&amp;t=h&amp;z=14&amp;output=embed"></iframe> thank you very much.

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  • Java: Set<E> collection, where items are identified by its class

    - by mschayna
    I need Set collection, where its items will be identified by items class. Something like ReferenceIdentityMap from Appache Collections, but on class scope i.e. two different instances of same class must be identified as same in this collection. You know, it is a violation of equals()/hashCode() identity principle but in occasional use it makes sense. I have done this in simple class backing with Map<Class<? extends E>, E>, but due to simplicity it doesn't implement Set<E>. There may be a more elegant solution, decorator of any Set<E> would be great. Is there any implementation of such collection there (Apache/Google/something/... Collections)?

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  • VB.NET 2.0 - StackOverflowException when using Thread Safe calls to Windows Forms Controls

    - by LamdaComplex
    I have a Windows Forms app that, unfortunately, must make calls to controls from a second thread. I've been using the thread-safe pattern described on the http://msdn.microsoft.com/en-us/library/ms171728.aspx. Which has worked great in the past. The specific problem I am having now: I have a WebBrowser control and I'm attempting to invoke the WebBrowser.Navigate() method using this Thread-Safe pattern and as a result I am getting StackOverflow exceptions. Here is the Thread-Safe Navigate method I've written. Private Delegate Sub NavigateControlCallback(ByRef wb As WebBrowser, ByVal url As String) Private Sub AsyncNavigate(ByRef wb As WebBrowser, ByVal URL As String) Try If wb.InvokeRequired Then Dim callback As New NavigateControlCallback(AddressOf AsyncNavigate) callback(wb, url) Else wb.Navigate(url) End If Catch ex As Exception End Try End Sub Is there a Thread-Safe way to interact with WinForms components without the side effect of these StackOverflowExceptions?

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  • WPF,XAML: How to set the ZIndex of a particular control to the topmost.

    - by Sudhakar Singh
    how do i set any control to the topmost of the screen. For e.g. i have a textblock in a datatemplate or a hierarchichal data template..etc... now i would like to set this textblock to the topmost on mouseover. Setting the Grid.ZIndex value to 1 in the trigger for IsMouseOver doesn't work many times. In order to do that i set the ZIndex value for all the contols to -1 in the window. it worked in one scenario but doesn't work other times. If anyone can get me the details of ZIndex and how to set the control to the topmost without worrying about the other controls, it would be of great help. Note: setting the value of ZIndex to a higher value e.g. 99999 also doesn't work.

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  • iPhone addition to already localized nibs

    - by user168610
    I've submitted an app to the store that has been localised into a number of languages. Now it's time to update a few things, so I've added a few new components to a xib or two and modify them as IBOutlets from my code. All works great in English, but when I change to a different language it appears that my nib additions haven't been propagated through the localised nibs that already existed. (I get an unrecognised selector on a UILabel I've added). What is the correct workflow for adding new items to an already localised nib? Should a modification to the top level .xib carry through to all localised versions? Or should I unlocalize, add new components and then localise all over again? Many thanks, Bryn

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  • What's your motivation to help others at stackoverflow?

    - by Bernhard V
    Hi! I gotta say that this site is really great because it helped me a lot at my job. I'm mostly the one asking the questions rather than answering it. Now I'd like to know what's your motivation to help others of whom you only know their nicknames? Because contrary to other communities on the Internet, this site lacks things like a message board where you can talk about all things in life or a function for private messaging. And in my opinion these two things normally help in building kind of a "social" environment. Also stackoverflow has probably lot's of users and is therefore not that tight-knitted. Maybe you can share some your thoughts with me.

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  • continuous integration web service

    - by Josh Moore
    I am in a position where I could become a team leader of a team distributed over two countries. This team would be the tech. team for a start up company that we plan to bootstrap on limited funds. So I am trying to find out ways to minimize upfront expenses. Right now we are planning to use Java and will have a lot of junit tests. I am planing on using github for VCS and lighthouse for a bug tracker. In addition I want to add a continuous integration server but I do not know of any continuous integration servers that are offered as a web service. Does anybody know if there are continuous integration servers available in a software as a service model? P.S. if anybody knows were I can get these three services at one location that would be great to know to.

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  • IE6 image scaling with bicubic filter

    - by thehuby
    I have a project where I have to resize some images in the actual browser side. IE8, FF3 et al all apply a filter to smooth the resizing of the image, so in these browsers everything looks good. In IE7 I have applied the following fix which works great: -ms-interpolation-mode:bicubic; In IE6 however I can only find references to the AlphaImage Filter (the same one used to enable alpha transparency on PNG files). However I can't find an example of how to use it, nor have I been able to get it working myself. Can anyone provide me with an example? Preferably applied to actual img tags, though I could use background images if required. MSDN link (for what its worth): http://msdn.microsoft.com/en-us/library/ms532969%28VS.85%29.aspx The code I am using in my CSS is applied to the img, though I've tried applying it to the img container as well (with no effect): #provider-list li img { filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src="/image.gif", sizingMethod="scale"); } A thousand thank you's in advance :) Rick

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