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• Dynamic Windows Forms Components (Performance problem)

  - by Svisstack

  I have a problem with performance of my code under Windows Forms. Have a form, her layout is depending on constructor data, because he layout must be OnLoad or in Constructor generated. I generation is simple, base FlowLayoutPanel have other FlowLayoutPanels, for each have a Label and TextBox with DataBinding. Problem is this is VERY SLOW, up to 20 seconds, i drawing less than 100 controls, from Performace Session i know a problem is on 70% procesing functions: System.Windows.Forms.Control.ControlCollection.Add(class System.Windows.Forms.Control) System.Windows.Forms.ControlBindingsCollection.Add(class System.Windows.Forms.Binding) How i can do with this? Anyone help me in this problem? How solve the dynamic form layout problem?

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• UIWebView: webViewDidStartLoad/webViewDidFinishLoad delegate methods not called when loading certain URLs

  - by Dia

  I have basic web browser implemented using a UIWebView. I've noticed that for some pages, none of the UIWebViewDelegate methods are called. An example page in which this happens is: http://www.youtube.com/user/google. Here are the steps to reproduce the issue (make sure you insert NSLog calls in your controller's UIWebViewDelegate methods): Load the above youtube URL into the UIWebView [notice that here, the UIWebViewDelegate methods do get called when the page loads] Touch the "Uploads" category on the page Touch any video in that category [issue: notice that a new page is loaded, but none of the UIWebView delegates are called] I know that this is not an issue of UIWebView's delegate not being set properly, since the delegate methods do get invoked when loading other links (e.g. if you try clicking on a link that takes you outside of youtube, you'll notice the delegate methods getting called). My gut feeling initially was that it might be because the page is loaded using AJAX, which may not invoke the delegate method. But then when I checked Safari, it did not exhibit this problem, so it must be something on my side. I've also noticed that Three20's TTWebController has the exact same issue as I'm having. But the problem that arises from this issue is that without the delegate methods called, I'm unable to update the UI to enable/disable the back and forward browsing buttons when new requests are loaded. And idea why this is happening or how can I work around it to update the UI when a new request is made?

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• reorder NSArray in objective-c

  - by Jonathan

  I have an NSArray of JSON file locations. There are stored in the user's/app's Document directory and inside each JSON file is a name value. I'm able to retreive the data from JSON files, I don't need help with tht. But I need help on sorting NSArrays I have no idea how I can do that based on a value inside the file, while not being pathetically slow. This is on the iPhone btw. In sum how do I customly reorder NSArrays.

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• Can SVG render partially if gzipped and chunk-transferred?

  - by Scott Stafford

  Hi - I have some large, dynamically generated SVGs that are being served over a relatively slow internet connection. I'm trying to optimize them to be viewable as fast as possible. If I set the server to Content-Encoding: gzip and Transfer-Encoding: chunked, will any SVG viewers take advantage of that and render it partially, as it is transferred? If not, are there other ways to get it to render as-it-streams? I could break it up into several SVG pieces but that will be a lot of work, I was hoping for server settings... The most common users use IE7 with the Adobe SVG Viewer plugin. I doubt it matters but I'm serving with C#/ASP.NET and IIS6.

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• Which book should I choose?

  - by sebastianlarsson

  Hi guys, I'm looking for a good read on object oriented design. The two books I'm currently looking Head First Design Patterns and Head First Object object-oriented analysis & design. They seem very similar when looking at the contents and browsing through available sample text. Which one would be the best choice? About myself: I have a bachelor in computer science and I am currently studying Msc. Software Quality Engineering (read Software Engineering with focus on Quality). I am already confident in object-oriented design and have a lot of programming courses in my backpack. I have done games in c++, courses in advanced java programming (I am SCJP certified), but my preferred language is C#. I have also worked with Java for the last 7 months while studying. I am currently also studying for certificates in C# (apart from my usual studies). So I believe I have the prerequisites of actually understanding the contents of both books. Reason: I just want to be better and keep evolving as a programmer. I think it is fun. I believe Bert Bates and Kathy Sierra are involved in both these books and I have previously read their SCJP preparation book in java. I really do enjoy their style of writing. Other books which I am considering are: Clean Code: A Handbook Of Agile Software Craftsmanship Thx in advance Sebastian

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• Recursive FTP directory listing in shell/bash with a single session (using cURL or ftp)

  - by Timo

  I am writing a little shellscript that needs to go through all folders and files on an ftp server (recursively). So far everything works fine using cURL - but it's pretty slow, becuase cURL starts a new session for every command. So for 500 directories, cURL preforms 500 logins. Does anybody know, whether I can stay logged in using cURL (this would be my favourite solution) or how I can use ftp with only one session in a shell script? I know how to execute a set of ftp commands and retrieve the response, but for the recursive listing, it has to be a little more dynamic... Thanks for your help!

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• Importing large datasets on iPhone using CoreData

  - by Matthes

  Hi there, I'm facing very annoying problem. My iPhone app is loading it's data from a network server. Data are sent as plist and when parsed, it neeeds to be stored to SQLite db using CoreData. Issue is that in some cases those datasets are too big (5000+ records) and import takes way too long. More on that, when iPhone tries to suspend the screen, Watchdog kills the app because it's still processing the import and does not respond up to 5 seconds, so import is never finished. I used all recommended techniques according to article "Efficiently Importing Data" http://developer.apple.com/mac/library/DOCUMENTATION/Cocoa/Conceptual/CoreData/Articles/cdImporting.html and other docs concerning this, but it's still awfully slow. Solution I'm looking for is to let app suspend, but let import run in behind (better one) or to prevent attempts to suspend the app at all. Or any better idea is welcomed too. Any tips on how to overcome these issues are highly appreciated! Thanks

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• Is there a Oracle equivalent of mysqldump

  - by Rakhitha

  Is there a way to dump the content of a oracle table in to a file formated as INSERT statements. I can't use oradump as it is on GPL. I will be running it from a perl CGI script. I am looking for something to dump data directly from oracle server using a single command. Running a select and creating insert statements using perl is too slow as there will be lot of data. I know I can probably do this using spool command and a plsql block at server side. But is there a built in command to do this instead of formating the INSERT statements myself?

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• How do I get accurev to find a moved workspace?

  - by eric f

  I created a workspace in AccuRev under M:\EclipseWorkspaces\. The project checked out fine. Then I moved the project to C:\EclipseWorkspaces\. Now AccuRev thinks the project does not exists. This is probably because AccuRev is looking for the project on my M drive. How do I get AccuRev to find my project? I am using version 5.3. This computer is slow so I'd like to do this using the CLI. Update: I deleted the workspace in the AccuRev client.... Can I add the workspace on my C drive into my stream in AccuRev?

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• Penalty of using QGraphicsObject vs QGraphicsItem?

  - by Dutch

  I currently have a hierarchy of items based off of QGraphicsItem. I want to move to QGraphicsObject instead so that I can put properties on my items. I will not be making use of signals/slots or any other features of QObject. I'm told that you shouldn't derive from QObject because it's "heavy" and "slow". To test the impact, I derive from QGraphicsObject, add a couple properties to my items, and look at the memory usage of the running app. I create 1000 items using both flavors and I don't notice anything more than 10k more memory usage. Since all I am adding on to my items are properties, is it safe to say that QObject only adds weight if you are using signals/slots?

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• PHP IP Validation Help

  - by Zubair1

  Hello, I am using this IP Validation Function that i came across while browsing, it has been working well until today i ran into a problem. For some reason the function won't validate this IP as valid: 203.81.192.26 I'm not too great with regular expressions, so would appreciate any help on what could be wrong. If you have another function, i would appreciate if you could post that for me. |--------------------------------------------| The code for the function is below: |--------------------------------------------| public static function validateIpAddress($ip_addr) { global $errors; $preg = '#^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}' . '(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$#'; if(preg_match($preg, $ip_addr)) { //now all the intger values are separated $parts = explode(".", $ip_addr); //now we need to check each part can range from 0-255 foreach($parts as $ip_parts) { if(intval($ip_parts) > 255 || intval($ip_parts) < 0) { $errors[] = "ip address is not valid."; return false; } return true; } return true; } else { $errors[] = "please double check the ip address."; return false; } }

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• Restfull authentication between two GAE apps.

  - by user259349

  Hello everyone, i am trying to write a restful google app engine application (python) that accepts requests only from another GAE that i wrote. I dont like any of the ways that i thought of to get this done, please advice if you know of something better than: Get SSL setup, and simply add the credentials on the request that my consuming app will send. I dont like it cause SSL will slow things down. Security by obsecurity. Pass a long number by my consuming app that is in Xmod0, where X is a secret number that both applications know. I just,,,, dont like this. Check the HTTP header to see where is the request coming from. This option is the one that i hate the least, not alot of processing, and spoofing an HTTP request is not really worth it, for my application's data. Is there any other clean solution for this?

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• What are some of best Javascript memory detecting tools?

  - by Philip Fourie

  Our team is faced with slow but serious Javascript memory leak. We have read up on the normal causes for memory leaks in Javascript (eg. closures and circular references). We tried to avoid those pitfalls in the code but it likely we still have unknown mistakes left in our code. I started my search for available tools but would like input from people with actual experience with these tools. Some of the tools I found so far (but have no idea how good and useful they would be for our problem): Sieve Drip JavaScript Memory Leak Detector Our search is not limited to free tools, it will be a bonus, but more importantly something that will get the job done. We do the following in our Javascript code: AJAX calls to a .NET WCF back-end that send back JSON data Manipulate the DOM Keep a fairly sized object model in the Javascript to store current state

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• Javascript tail recursion

  - by Misha Moroshko

  Why the following code runs so.... slow....... ? <html><body><script type="text/javascript"> var i = 0; f(); function f() { if (i == 5000) { document.write("Done"); } else { i++; tail(); } } function tail() { var fn = tail.caller; var args = arguments; setTimeout(function() {fn.apply(this, args)}, 0); }; </script></body></html>

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• How to do call function after client finishes download from tornado web server?

  - by Shabbyrobe

  I would like to be able to run some cleanup functions if and only if the client successfully completes the download of a file I'm serving using Tornado. I installed the firefox throttle tool and had it slow the connection down to dialup speed and installed this handler to generate a bunch of rubbish random text: class CrapHandler(BaseHandler): def get(self, token): crap = ''.join(random.choice(string.ascii_uppercase + string.digits) for x in range(100000)) self.write(crap) print "done" I get the following output from tornado immediately after making the request: done I 100524 19:45:45 web:772] 200 GET /123 (192.168.45.108) 195.10ms The client then plods along downloading for about 20 seconds. I expected that it would print "done" after the client was done. Also, if I do the following I get pretty much the same result: class CrapHandler(BaseHandler): @tornado.web.asynchronous def get(self, token): crap = ''.join(random.choice(string.ascii_uppercase + string.digits) for x in range(100000)) self.write(crap) self.finish() print "done" Am I missing something fundamental here? Can tornado even support what I'm trying to do? If not, is there an alternative that does?

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• Is there a way to programmatically tell if particular block of memory was not freed by FastMM?

  - by Wodzu

  I am trying to detect if a block of memory was not freed. Of course, the manager tells me that by dialog box or log file, but what if I would like to store results in a database? For example I would like to have in a database table a names of routines which allocated given blocks. After reading a documentation of FastMM I know that since version 4.98 we have a possibility to be notified by manager about memory allocations, frees and reallocations as they occur. For example OnDebugFreeMemFinish event is passing to us a PFullDebugBlockHeader which contains useful informations. There is one thing that PFullDebugBlockHeader is missing - the information if the given block was freed by the application. Unless OnDebugFreeMemFinish is called only for not freed blocks? This is which I do not know and would like to find out. The problem is that even hooking into OnDebugFreeMemFinish event I was unable to find out if the block was freed or not. Here is an example: program MemLeakTest; {$APPTYPE CONSOLE} uses FastMM4, ExceptionLog, SysUtils; procedure MemFreeEvent(APHeaderFreedBlock: PFullDebugBlockHeader; AResult: Integer); begin //This is executed at the end, but how should I know that this block should be freed //by application? Unless this is executed ONLY for not freed blocks. end; procedure Leak; var MyObject: TObject; begin MyObject := TObject.Create; end; begin OnDebugFreeMemFinish := MemFreeEvent; Leak; end. What I am missing is the callback like: procedure OnMemoryLeak(APointer: PFullDebugBlockHeader); After browsing the source of FastMM I saw that there is a procedure: procedure LogMemoryLeakOrAllocatedBlock(APointer: PFullDebugBlockHeader; IsALeak: Boolean); which could be overriden, but maybe there is an easier way?

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• Document Similarity: Comparing two documents efficiently

  - by seanieb

  I have a loop that calculates the similarity between two documents. It collects all the tokens in a document and their scores, and places them in dictionary. It then compares the dictionaries This is what I have so far, it works, but is super slow: # Doc A cursor1.execute("SELECT token, tfidf_norm FROM index WHERE doc_id = %s", (docid[i][0])) doca = cursor1.fetchall() #convert tuple to a dictionary doca_dic = dict((row[0], row[1]) for row in doca) #Doc B cursor2.execute("SELECT token, tfidf_norm FROM index WHERE doc_id = %s", (docid[j][0])) docb = cursor2.fetchall() #convert tuple to a dictionary docb_dic = dict((row[0], row[1]) for row in docb) # loop through each token in doca and see if one matches in docb for x in doca_dic: if docb_dic.has_key(x): #calculate the similarity by summing the products of the tf-idf_norm similarity += doca_dic[x] * docb_dic[x] print "similarity" print similarity I'm pretty new to Python, hence this mess. I need to speed it up, any help would be appreciated. Thanks.

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• Improving the efficiency of Kinect for Windows DTWGestureRecognition Application

  - by Ray

  Currently I am using the DTWGestureRecognition open source tool for Kinect SDK v1.5. I have recorded a few gestures and use them to navigate through Windows 7. I also have implemented voice control for simple things such as opening PowerPoint, Chrome, etc. My main issue is that the application uses quite a bit of my CPU power which causes it to become slow. During gestures and voice commands, the CPU usage sometimes spikes to 80-90%, which causes the application to be unresponsive for a few seconds. I am running it on a 64 bit Windows 7 machine with an i5 processor and 8 GB of RAM. I was wondering if anyone with any experience using this tool or Kinect in general has made it more efficient and less performance hogging. Right now I removed sections which display the RGB video and the Depth video but even doing that did not make a big impact. Any help is appreciated, thanks!

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• What is a good Javascript RDFa parser implementation?

  - by tremoloqui

  I am looking to implement a client side RDFa based formatting for a web application. This would be similar to Mark Birbeck's ubiquity-rdfa project. Mark's project looks fantastic but it has at least two drawbacks: It is slow. Adding RDFa formatting to a simple page causes a noticeable delay in page loading. It is complex. The ubiquity-rdfa project makes use of the w3c fresnel specification which is complex way to add simple annotations to client markup. I am looking for a lighter weight way of adding annotations through client code and I don't mind doing some work to get it. What I would like is a fast and reliable Javascript RDFa parser. Some implementations that I have found include: W3C RDFa bookmarklet parser Elias Torres RDFa extractor I am interested to know if you would recommend one of these, or another, RDFa Javascript implementation. Thanks!

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• Flex Arraycollection filter

  - by Prashant

  Hello all I am working in Flex. I have an arraycollection which is used to fill a tilelist with images. I am using filter method of arraycollection to filter out certain images from tilelist based on a selected value from combobox. The issue is that when the images are filtered out they just vanish suddenly. But I want to give some effect to them when they are filtered out, say slow fade effect or zoom effect. I tried removedEffect, hideEffect etc. but in vain. Can anyone please help me out. thanks.

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• Machine learning in OCaml or Haskell?

  - by griffin

  I'm hoping to use either Haskell or OCaml on a new project because R is too slow. I need to be able to use support vectory machines, ideally separating out each execution to run in parallel. I want to use a functional language and I have the feeling that these two are the best so far as performance and elegance are concerned (I like Clojure, but it wasn't as fast in a short test). I am leaning towards OCaml because there appears to be more support for integration with other languages so it could be a better fit in the long run (e.g. OCaml-R). Does anyone know of a good tutorial for this kind of analysis, or a code example, in either Haskell or OCaml?

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• jQuery show/hide does not work on IE

  - by user1720534

  I have made simple jQuery script that should show div element when hovering mouse over another div (image). Here is my code: jQuery(document).ready(function(){ jQuery("#slider").hover(function(){ jQuery("#slider .hovercontent").fadeTo('fast', 1); },function(){ jQuery('#slider .hovercontent').fadeTo('slow', 0); }); }); Here is url for page: http://asiakas.henripylvas.com/henripylvas/ This works flawless on FF, Chrome, Safari and Opera but when using IE8 or 9 image in #slider div disappear. What is wrong? Tried to search answer for this but no luck. Thanks.

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• AJAX vs ActiveX/Flash for browser-based game

  - by iconiK

  I have been following the usage of JavaScript for the past few years, and with the release of extremely fast scripting engines (V8, SquirrelFish Extrene, TraceMonkey, etc.) the possibilities of JavaScript have increased dramatically. However, the usage share of Internet Explorer coupled with it's total lack of support for recent standards makes me want to drop a bomb on Microsoft's HQ, as it creates a huge amount of problems for any website. The game will need to be pretty dynamic client-side, with animations and other eye-candy things, but not a full-blown game like those that run directly in the OS using DirectX or OpenGL. However, this might be a little stretch for JavaScript and will certainly feel extremely slow in Internet Explorer (given that the current IE engine can be hundreds of times slower than SFX; gotta see what IE9 will bring), would it be better to just do the whole thing in Flash? I know this means requiring the plug-in AND I have no experience whatsoever with Flash (other than browsing YouTube :P). It also means I can't just output directly from PHP, I would have to use XML or some other format to pass data to it (JSON is directly integrated in JS and PHP can deal with it easily). Another idea would be to provide an alternative interface just for IE, though I don't know how (ActiveX maybe? or with Flash, then why not just provide it to all browsers) or totally not supporting it and requiring the use of other browsers, although this is plain stupid from a business perspective. So here am I, wondering what approach to take and thus asking for your advice. How should I build the client-side? AJAX in all browsers, Flash in all browsers or a mix (AJAX for "modern" browsers and something else for the "grandpa": IE).

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• How to stop a curl while requesting or stop the running php script?

  - by Chris

  I using url to request remote urls that sometimes may very slow or just down. In this case, my php scripts still waiting for the response, it makes apache has to many requests stay in memory and then overload. I need a way to stop curl requesting or stop running php script when specified time passed. I'd tried declare(), it makes no sense for curl. Can someone know how to solve it? BTW: what is the effect of CURLOPT_CONNECTTIMEOUT and CURLOPT_TIMEOUT? They don't work like what I think.

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• Accomplishing This Style of Drop-Down Menus in jQuery

  - by Maxim Z.

  I was browsing the web and found this site. I noticed how the nav bar drop-down works, and I want to implement something similar on my website. Afer going into the source code of the page, I found that those drop-down areas are contained in divs with class fOut. It turns out that this is being done with MooTools. Here is the script itself (referenced in the original page after the Mootools script itself): window.addEvent('domready', function() { $("primaryNav").getChildren("li").addEvents({ "mouseenter": function(){ $(this).addClass("hover").getChildren("a").addClass("hover"); }, "mouseleave": function(){ $(this).removeClass("hover").getChildren("a").removeClass("hover"); } }); $$(".fOut").each(function(el,i){ var ifr = $(document.createElement("iframe")); ifr.className = "ieBgIframe"; ifr.frameBorder = "0"; ifr.src="about:blank"; ifr.injectInside(el); var p = el.getParent(); p.addClass("hover"); var h = el.getSize().size.y; p.removeClass("hover"); ifr.height=h; }); $$(".olderVersionsToggle").addEvents({ "click": function(e){ var event = new Event(e); event.stop(); var p = $(this).getParent().getNext(); if(p.hasClass("open")){ p.removeClass("open"); $(this).setText("Show previous versions..."); } else{ p.addClass("open"); $(this).setText("Hide previous versions..."); } return false; } }); }); My Question(s) I have two questions about this code. How does it work? I don't quite understand what it's doing, with the iframes and all. How can this be implemented in jQuery?

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