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• Is Objective C fast enough for DSP/audio programming

  - by morgancodes

  I've been making some progress with audio programming for iPhone. Now I'm doing some performance tuning, trying to see if I can squeeze more out of this little machine. Running Shark, I see that a significant part of my cpu power (16%) is getting eaten up by objc_msgSend. I understand I can speed this up somewhat by storing pointers to functions (IMP) rather than calling them using [object message] notation. But if I'm going to go through all this trouble, I wonder if I might just be better off using C++. Any thoughts on this?

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• Can I turn off context menu scrolling in VS2010?

  - by Jane McDowell

  When I right-click in the middle of a code editor window in Visual Studio 2010 RTM, a context menu appears. This takes up about a fourth the height of the screen but doesn't show all options. Instead it scrolls up and down when you move the pointer to the top or bottom of the menu. If I click near the top or bottom of the screen, the menu is normal and doesn't scroll. Can I turn this behavior off? It's stupid. You can't even scroll using the mouse wheel. EDIT I reckon this might just be a bug - I've found a few.

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• What is the Relative Performance of Pseudo-Class and Custom Selectors?

  - by James Wiseman

  It's my understanding that, in terms of selector speed, that #ID selectors are fastest, followed by element selectors, and then .class selectors. I have always assumed that pseudo-class selectors and custom selectors (those in the form ':selector') are similar to .class selectors, but I realised that I'm just not sure. I realise that this does depend on the complexity of the code within the pseudo-class/custom selector, so I guess I'd like to know the answer with this excluded as factor. Any help would be appreciated. Thanks.

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• C# Audio - How to time stretch (different tempo, same pitch)

  - by heath

  I'm trying to make a winform app in C# (VS2008) that can load an mp3 (other formats would be nice, but mp3 at a minimum) and be able to adjust the playback speed (tempo) without affecting pitch. I really don't need any other audio effects. I tried using DirectShow but that doesn't seem to offer time stretch capabilities. I was able to incorporate irrklang but that does not seem to have the time stretch capability either. So now I've moved on to SoundTouch. That certainly has the capabilities but I'm very unclear on how to implement in C#. After a few days of this, about all I've accomplished is using DLLImport on the SoundTouch DLL and am able to successfully retrieve a version number. At this point, I'm not even sure if I can do what I'm trying to do with SoundTouch. Can anyone offer some guidance either on how to implement SoundTouch or a different library with the capabilities that I'm looking for? Thank you.

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• jquery cycle "allowPagerClickBubble: true" not quite working

  - by Shelagh

  Hi all, I want my page anchors to work as menu links so I used this code: $(function() { $('#slideshow').cycle({ slideExpr: 'img', fx: 'fade', speed: 2000, timeout: 4000, pager: '#nav', pagerEvent: 'mouseover', pauseOnPagerHover: true, pagerAnchorBuilder: function(idx, slide) { // return sel string for existing anchor return '#nav li:eq(' + (idx) + ') a'; }, allowPagerClickBubble: true }); }); If you click the right mouse button, you can choose to open the links and they do open just fine but a normal left button click does nothing. The thing is, they WERE working so I went to work on supposedly unrelated parts of the website and at some point the left mouse button click stopped working. Any ideas what I might have done? Left button clicking still works for everything else on the site so its not some global setting. The cycle is here if my explanation is not clear: http://www.mcguirenaturals.ca/index.php Thanks for any help

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• IPhone like scrolling on Silverlight ListBox

  - by Larsi

  Hi! I need a listbox with IPhone-like functionality for Silverlight. That is, animated scrolling, and click and drag to scroll. Scrolling will continue a bit after the mouse up event based on the "speed" of the dragging. I've search and found no control vendors providing this. So question is how should I build it? I need some hints to get started. There's two parts to this question: Part 1, How to get the animated scrolling of the listbox. Part 2, How to build a "draggable" scrolling, I guess I should put a canvas on top and track the mouseevent, and simulate some physics. Some hints here would have been great. Thanks Larsi.

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• How to send native texture ptr from Unity web player to a browser plug-in?

  - by user2928039

  I have written an NPAPI browser plug-in (using Firebreath) that Unity uses to access Kinect camera. I can retrieve skeleton data from Unity through JavaScript easily since it isn't too big but the problem is in retrieving color image data. Is it possible to send a native texture pointer (GetNativeTexturePtr) from Unity through JavaScript into the C++ plug-in so that it can write the texture data directly? (tested in standalone version and it works) Any other suggestions on how to transfer image data from browser plug-ins to Unity web player are very welcome. Thanks.

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• Why 'initWithObjectsAndKeys:' doesn't throw a casting warning? (NSDictionary)

  - by rubdottocom

  Sorry if the question isn't correct, I'm very new in Objective-C. I understand why this code throw the Warning: "warning: passing argument 1 of 'initWithObjectsAndKeys:' makes pointer from integer without" NSDictionary *dictNames = [[NSDictionary alloc] initWithObjectsAndKeys: 3, @"", 4, @"", 5, @"",nil]; Keys and Values of a NSDictionary must be NSObject and not fundamental types, like the integers 3, 4 and 5. (Correct me if necessary). But I don't understand why this warning dissapears with the only "correct typing" of the first Key. NSDictionary *dictNames = [[NSDictionary alloc] initWithObjectsAndKeys: [NSNumber numberWithInteger:3], @"", 4, @"", 5, @"",nil]; It's because NSDictionary assumes the type of the other Keys? Is correct this manner of initialization?

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• Using truncate table alongside Hibernate?

  - by Marcus

  Is it OK to truncate tables while at the same time using Hibernate to insert data? We parse a big XML file with many relationships into Hibernate POJO's and persist to the DB. We are now planning on purging existing data at certain points in time by truncating the tables. Is this OK? It seems to work fine. We don't use Hibernate's second level cache. One thing I did notice, which is fine, is that when inserting we generate primary keys using Hibernate's @GeneratedValue where Hibernate just uses a key value one greater than the highest value in the table - and even though we are truncating the tables, Hibernate remembers the prior value and uses prior value + 1 as opposed to starting over at 1. This is fine, just unexpected. Note that the reason we do truncate as opposed to calling delete() on the Hibernate POJO's is for speed. We have gazillions of rows of data, and truncate is just so much faster.

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• Best DataMining Database

  - by Eric

  I am an ocasional Python programer who only have worked so far with MYSQL or SQLITE databases. I am the computer person for everything in a small compamy and I have been started a new project where I think it is about time to try new databases. Sales departament makes a CSV dump every week and I need to make a small scripting application that allow people form other departaments mixing the information, mostly linking the records. I have all this solved, my problem is the speed, I am using just plain text files for all this and unsurprisingly it is very slow. I thought about using mysql, but then I need installing mysql in every desktop, sqlite is easier, but it is very slow. I do not need a full relational database, just some way of play with big amounts of data in a decent time. Many thanks!

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• What is the correct Qt idiom for exposing signals/slots of contained widgets?

  - by Tyler McHenry

  Suppose I have a MyWidget which contains a MySubWidget, e.g. a custom widget that contains a text field or something. I want other classes to be able to connect to signals and slots exposed by the contained MySubWidget instance. Is the conventional way to do this: Expose a pointer to the MySubWidget instance through a subWidget() method in MyWidget Duplicate the signals and slots of MySubWidget in the MyWidget class and write "forwarding" code Something else? Choice 1 seems like the least code, but it also sort of breaks encapsulation, since now other classes know what the contained widgets of MyWidget are and might become dependent on their functionality. Choice 2 seems like it keeps encapsulation, but it's a lot of seemingly redundant and potentially convoluted code that kind of messes up the elegance of the whole signals and slots system. What is normally done in this situation?

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• Why aren't we programming on the GPU???

  - by Chris

  So I finally took the time to learn CUDA and get it installed and configured on my computer and I have to say, I'm quite impressed! Here's how it does rendering the Mandelbrot set at 1280 x 678 pixels on my home PC with a Q6600 and a GeForce 8800GTS (max of 1000 iterations): Maxing out all 4 CPU cores with OpenMP: 2.23 fps Running the same algorithm on my GPU: 104.7 fps And here's how fast I got it to render the whole set at 8192 x 8192 with a max of 1000 iterations: Serial implemetation on my home PC: 81.2 seconds All 4 CPU cores on my home PC (OpenMP): 24.5 seconds 32 processors on my school's super computer (MPI with master-worker): 1.92 seconds My home GPU (CUDA): 0.310 seconds 4 GPUs on my school's super computer (CUDA with static domain decomposition): 0.0547 seconds So here's my question - if we can get such huge speedups by programming the GPU instead of the CPU, why is nobody doing it??? I can think of so many things we could speed up like this, and yet I don't know of many commercial apps that are actually doing it. Also, what kinds of other speedups have you seen by offloading your computations to the GPU?

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• Embedded file system and sqlite

  - by Jeff Lamb

  I'm working on an embedded project that has no file system, and our kludge of a database has ballooned in functionality. It's now so inefficient, we can't stand it any longer. I'm trying to figure out if there's built-in support for a flat file system in SQLite. I've dug around http://sqlite.org for a while now, but haven't found anything specifically covering it. Has anyone found a supported implementation written in C? It seems like such a straightforward request, but I can't find anything written about it. We have plenty of memory available. In a perfect world, I'd like to just set aside a large portion of it, pass the FS a pointer, then let the FS/SQLite library just use what it wants.

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• autoscrolling for UIScrollView

  - by thndrkiss

  Hi, I used the setContentOffset method to scroll to a particular point automatically without user interaction. [menuScrollView setContentOffset:CGPointMake(600.0,0) animated:YES] but when i try to call the same method in a looping fashion inorder to slow down the speed of scrolling the scrolling never happens for (int i = 1; i<=30; i++) { [menuScrollView setContentOffset:CGPointMake(600.0-i*10,0.0) animated:YES]; NSLog(@"%f",600.0-i*10); } During the above piece of code the scrolling of UIScrollview happens only once (1st iteration( and it does not scroll for remaining 29 interations. What is the problem here ?

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• Load NSImage into QPixmap or QImage

  - by Thomi

  I have an NSImage pointer from a platform SDK, and I need to load it into Qt's QImage class. To make things easier, I can create a QImage from a CGImageRef by using QPixmap as an intermediate format, like this: CGImageRef myImage = // ... get a CGImageRef somehow. QImage img = QPixmap::fromMacCGImageRef(myImage).toImage(); However, I cannot find a way to convert from an NSImage to a CGImageRef. Several other people have had the same problem, but I have yet to find a solution. There is the CGImageForProposedRect method, but I can't seem to get it to work. I'm currently trying this (img is my NSImage ptr): CGImageRef ir = [img CGImageFirProposedRect:0:0:0]; Any ideas?

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• Any Flex 4 migration experience?

  - by Gok Demir

  My current development stack is MySQL + iBatis + Spring + Spring BlazeDS Integration 1.01 + BlazeDS 3.2 and Flex 3 with Mate 0.8.9 framework. Now Flash Builder 4 beta 2 is out. There are cool features like Data Centric Development (DCD), form generation etc... Do you know how Spring Blazeds Integration works with BlazeDS 4? What about Mate? Is there any issues with Flex 4 ? How DCD suits with mate eventmaps. I know it is better to try it out myself but I just want to check if somebody ever tried to migrate Flex 4. If so what are the issues? Did you notice any productivity speed up? Thanks.

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• Can't make wmode: 'transparent' work on sIFR 3

  - by Synue

  I've been trying to use sIFR to change some text in my webpage. It works fine until I try to get it to use a transparent canvas. The code I'm using is as follow. I have no idea to fix it. I've seen a lot of people make this questions about wmode: 'transparent' and it all seems to work but mine. Can someone give me a hand??? Without the wmode: 'transparent' property it works fine. When I include the property it doesn't activate sIFR and we get the page as the normal HTML. sIFR.replace(myriadPro, { selector: '#title1,#title3,#title5,#title7,#title9,#title11,#title13,#title15,#title17,#title19', css: [ '.sIFR-root {background-color:none;font-size:45px;visibility:visible;text-decoration:none;color:#4C4843;cursor:pointer;}' ], wmode: 'transparent' });

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• Storing callbacks in a dictionary (Objective C for the iPhone)

  - by Casebash

  I am trying to store callbacks in a dictionary. I can't use blocks as the iPhone doesn't support this (unless you use plblocks). I tried using functions, but apparently NSMutableDictionary doesn't allow these pointers (wants an id) I tried using class methods, but I couldn't find a way to obtain a pointer to these I could try using functions with the c++ stl hashmap (if it is supported in Objective C++), but apparently this can slow compilation times. I could try storing both a class and a selector, but that seems rather messy. What would be the best way to do this?

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• dell server display on laptop screen

  - by hari

  Please redirect if this is not (and probably thats true) the correct forum/site. I have a dell server and I am trying to configure it for the first time. It is running windows server 2003. I do not have a monitor screen. Can I use laptop screen to display dell server and set it up? I mean to say is, if I can display dell server on laptop screen, it would be great. I am trying that with a dell laptop but not getting the display. Any help/pointer would be appreciated. Thanks in advance.

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• PHP stream_context_set_option SSL certificate as string

  - by Roger Thomas

  I've got a weird issue. Basically, I need to do this: $handle = stream_context_create(); stream_context_set_option($handle , 'ssl', 'local_cert', '/tmp/cert'); However. The certificate is not held as a file within the server. Rather it's an encrypted string held in a clustered database environment. So instead of the certificate being a file name pointer, its the physical content of the certificate. So instead of using the file name, I need to specify the content of the certificate instead. For example: $cert = '-----BEGIN CERTIFICATE-----.... upWbwmdMd61SjNCdtOpZcNW3YmzuT96Fr7GUPiDQ -----END CERTIFICATE-----'; Does anyone have any idea whatsoever how on earth I can do this? I'm scratching my head over this problem, but my gut instinct says it is doable. Thanks in advance everyone!

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• Change parent class of dom object via css selectors

  - by Le_Coeur

  Can i change parent class of some dom object on hover event via CSS selectors? For example I have such block: <span class="wBlock" > <span class="wText">Text</span> <span class="wLink"/> <\/span> and if i move mouse to span "wLink" span "wBlock" must be changed, and if i move out than it must be the same as at the begining .wLink{ padding-right:15px; background:url(/img/addlink.png) center right no-repeat; cursor:pointer; } .wText{ background-color: #1BE968; } It's something like this and if i move my cursor to plus text highlight must be changed to yellow

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• Is NSNumberFormatter the only way to format an NSDecimalNumber?

  - by Paul Alexander

  I'm using an NSDecimalNumber to store money in Core Data. I naively used stringWithFormat: at first to format the value, later realizing that it didn't support NSDecimalNumber and was instead formatting the pointer :(. So after some reading through the docs I learned to use the NSNumberFormatter to get the format I wanted. But this just strikes me as the "hard way". Is there any easier way than this:? NSNumberFormatter * formatter = [[NSNumberFormatter alloc] init]; [formatter setNumberStyle: NSNumberFormatterCurrencyStyle]; priceField.text = [formatter stringFromNumber: ent.price]; [formatter release];

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• iPhone: launch image for tab app?

  - by Karsten Silz

  I have a tab-based iPhone app where I want to increase the perceived start-up speed with a launch image. As defined by the iPhone HIG, the launch image is a screenshot of your app (called Default.png) that is displayed immediately and looks very similar to the app's first screen (e.g., the screenshot of an empty table when the app displays a table first). Now the problem with a tab-based app is that users can rearrange the order of tabs so that any of the tabs may be the first tab to show upon launch. I think I read somewhere that you can't change the Default.png programmatically in your app, but I couldn't find that in the HIG (and the "Clock" app seems to do exactly that - having one launch image per tab). So, how do provide a launch image for a tab-based app?

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• .NET COM Interop with references to other libraries

  - by user262190

  Hello,I'm up against a problem when loading a class in a managed library from a COM Interop library. basically I have some Unmanaged C++ code and a COM Interop library written in C#. And finally a 3rd library which is referenced by the COM Interop library which contains a class: public class MyClass{ public MyClass(){} } What I'd like to do is from my unmanaged c++ code, call a function in the Interop library The C++ code doesn't need to know of the existence of the third library, it's only used within the Interop. Init(){ MyClass _class = new MyClass(); } for some reason this line in Init fails "MyClass _class = new MyClass();", and I don't get very usefull error messages, all I have to go on is a few of these in my output window: "First-chance exception at 0x7c812afb in DotNet_Com_Call.exe: Microsoft C++ exception: [rethrow] at memory location 0x00000000.." and the HRESULT of the "HRESULT hr = pDotNetCOMPtr-Init();" line in my C++ code is "The system cannot find the specified file" I'm new to COM so if anyone has any ideas or pointer to get me going the right direction, I'd appreciate it, Thanks

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• jQuery scrollTop not working in chrome but working in Firefox

  - by Maju

  I have used a scrollTop function in jquery for navigating to top. But strangely 'The smooth animated scroll' stopped working in safari and chrome(scrolling without smooth animation) after I made some changes. But it is working smoothly in Firefox. What could be wrong? Here is the jquery function i used, jQuery $('a#gotop').click(function() { $("html").animate({ scrollTop: 0 }, "slow"); //alert('Animation complete.'); //return false; }); HTML <a id="gotop" href="#">Go Top </a> CSS #gotop { Cursor: pointer; position: relative; float:right; right:20px; /*top:0px;*/ }

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