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• ArgumentError: Error #2004: One of the parameters is invalid.

  - by Florian

  I got the following stack trace while running a piece of code in my flex application: ArgumentError: Error #2004: One of the parameters is invalid. at ObjectOutput/writeObject() at mx.collections::ArrayList/writeExternal()[C:\autobuild\galaga\frameworks\projects\framework\src\mx\collections\ArrayList.as:470] at mx.collections::ArrayCollection/writeExternal()[C:\autobuild\galaga\frameworks\projects\framework\src\mx\collections\ArrayCollection.as:144] at flash.utils::ByteArray/writeObject() at mx.utils::ObjectUtil$/copy()[C:\autobuild\galaga\frameworks\projects\framework\src\mx\utils\ObjectUtil.as:100] at components::SettingsHandler/saveOpenNodes()[C:\workspaces\Intranets\UniqueInbox\flex_src\components\SettingsHandler.as:153] at components::soapjira/getIssuesByFilters()[C:\workspaces\Intranets\UniqueInbox\flex_src\components\soapjira.as:295] at components.tabs::JiraAllActions/loadData()[C:\workspaces\Intranets\UniqueInbox\flex_src\components\tabs\JiraAllActions.mxml:193] at components::SettingsHandler/settingsClosed()[C:\workspaces\Intranets\UniqueInbox\flex_src\components\SettingsHandler.as:114] at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at mx.core::UIComponent/dispatchEvent()[C:\autobuild\galaga\frameworks\projects\framework\src\mx\core\UIComponent.as:9408] at components.general::JiraSettings/closeSettings()[C:\workspaces\Intranets\UniqueInbox\flex_src\components\general\JiraSettings.mxml:58] at components.general::JiraSettings/__save_click()[C:\workspaces\Intranets\UniqueInbox\flex_src\components\general\JiraSettings.mxml:107] That stack comes up when running the following line (SettingsHandler.as:153): var tmp:Object = parentComponent.dataGrid.dataProvider.openNodes; I am actually copying the open nodes of a datagrid's provider. Has been working until now and just started going wrong, no idea what I have changed that could interfere with this. On debug mode, I see that openNodes is accessible and contains the open nodes, as expected. Doing tmp:Object = parentComponent.dataGrid.dataProvider.openNodes works, but not with ObjectUtil. (parentComponent is the reference to the component which contains the DG).

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• Improving long-polling Ajax performance

  - by Bears will eat you

  I'm writing a webapp (Firefox-compatible only) which uses long polling (via jQuery's ajax abilities) to send more-or-less constant updates from the server to the client. I'm concerned about the effects of leaving this running for long periods of time, say, all day or overnight. The basic code skeleton is this: function processResults(xml) { // do stuff with the xml from the server } function fetch() { setTimeout(function () { $.ajax({ type: 'GET', url: 'foo/bar/baz', dataType: 'xml', success: function (xml) { processResults(xml); fetch(); }, error: function (xhr, type, exception) { if (xhr.status === 0) { console.log('XMLHttpRequest cancelled'); } else { console.debug(xhr); fetch(); } } }); }, 500); } (The half-second "sleep" is so that the client doesn't hammer the server if the updates are coming back to the client quickly - which they usually are.) After leaving this running overnight, it tends to make Firefox crawl. I'd been thinking that this could be partially caused by a large stack depth since I've basically written an infinitely recursive function. However, if I use Firebug and throw a breakpoint into fetch, it looks like this is not the case. The stack that Firebug shows me is only about 4 or 5 frames deep, even after an hour. One of the solutions I'm considering is changing my recursive function to an iterative one, but I can't figure out how I would insert the delay in between Ajax requests without spinning. I've looked at the JS 1.7 "yield" keyword but I can't quite wrap my head around it, to figure out if it's what I need here. Is the best solution just to do a hard refresh on the page periodically, say, once every hour? Is there a better/leaner long-polling design pattern that won't put a hurt on the browser even after running for 8 or 12 hours? Or should I just skip the long polling altogether and use a different "constant update" pattern since I usually know how frequently the server will have a response for me?

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• Why is EXC_BAD_ACCESS so unhelpful?

  - by Dustin

  First let me say I come from a background in Flash/AS3, which I realize is not as strict about most things as iPhone/Objective-C. I suspect my question actually applies to AS3 as well, but let me ask it as pertaining to Obj-c. Why is the error EXC_BAD_ACCESS, and others like it, so unhelpful? I realize that it normally means mismanagement of memory somewhere, but why can't it tell you more about the problem. For instance why doesn't it say "EXC_BAD_ACCESS, you tried to pass pointer suchAndSuch on line 123, however you're an idiot, because you released it on line 69 so it's not available anymore"? I realize I can use the debugger to get more clues about where my error occurred, but many times this is only marginally helpful. For instance sometimes none of the messages in the stack/thread/whatever are even my code. Other times it is my code but on the top of the stack will be a message that has 4+ parameters, ok thanks debugger you narrowed it down to 4 possible pointers by why can't you just tell me which one!? I'm guessing there's just some fundamental explanation that I missed because of the background I came from, not needing to worry about memory and such. Although there is an error that can happen a lot in AS3 development that is equally mysterious and along the same lines. "Error #1009: Cannot access a property or method of a null object reference" which almost always means a variable you were expecting to be holding something is actually null. Why doesn't it tell me WHICH variable?!

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• WPF Dispatcher.UnhandledException within a ShowDialog call.

  - by Eric

  It appears that ShowDialog() invokes the Dispatcher message handling loop within. Thus, you have a stack that looks something like: Outer-most Dispatcher message loop ... x.ShowDialog() Inner Dispatcher message loop ... I am using the Dispatcher.UnhandledException to catch exceptions not handled by my code. However, it appears that the Inner Dispatcher message loop, above, is undesirably catching exceptions that my code would catch. Example: Outer-most Dispatcher message loop try/catch FooException ... x.ShowDialog() Inner Dispatcher message loop ... throw FooException What I would like is for the thrown FooException to get caught by the try/catch. However. It gets caught first by the (inner) Dispatcher.UnhandledException. I see there are ways to filter the exception. However, those filters will apply to both the inner and outer most handlers. What I am looking for is to have my Dispatcher.UnhandledException code run only on the outer-most dispatcher message loop. Does that make sense? I could, of course, reflect the call stack from within my handler to see if this is the outer-most dispatcher, but that seems a bit fragile. Other ideas? Thanks! Eric

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• OutOfMemoryException, large Private Data

  - by Captain Comic

  Hello, In previous series: http://stackoverflow.com/questions/2543648/outofmemoryexception-stack-size-is-huge-large-number-of-threads I have a .net windows service that consumes a lot of memory. The GC heap is not big. Also the stack size is not big. What is big is something called a private data. Also I can see in task manager that my application consumes a lot something that taskmanager calls a handle. My application consumes 2326 handles. I believe that these handles are some windows handles that occupy private data. I can see that this private data is occupied by blocks marked as Thread Environment Block. What is that? Screenshot of my application memory usage by VMMap Screenshot of my application memory usage by Task Manager UPDATE I run ProcessExplorer. I have two instances of my service running at the moment. I can see that they consume a lot of virtual memory for Gen2 GC. This look suspicios. Also total reserved for GC Heap size is the same for two processes.

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• Why does ruby-debug say 'Saved frames may be incomplete'

  - by Chris McCauley

  From time-to-time I get this when a breakpoint is triggered. It looks like stack frames aren't getting saved so I can't step back through the call stack - a real pain. See below for an example --> #0 BatchProcess.add_failure_record(row_id#Fixnum, test#Struct::Test, message#String,...) at line server/processes/batch.rb:309 Warning: saved frames may be incomplete; compare with caller(0). (rdb:1) pp caller ["./server/processes/batch.rb:309:in `run_tests'", "./server/processes/common/generic_process.rb:219:in `each'", "./server/processes/common/generic_process.rb:219:in `run_tests'", "./server/processes/common/generic_process.rb:271:in `run_plan'", "./server/processes/common/corrections.rb:19:in `each_with_index'", "./server/processes/common/generic_process.rb:266:in `each'", "./server/processes/common/generic_process.rb:266:in `each_with_index'", "./server/processes/common/generic_process.rb:266:in `run_plan'", "./server/processes/batch.rb:202:in `run_engine'", "/usr/lib/ruby/1.8/benchmark.rb:293:in `measure'", "./server/processes/batch.rb:201:in `run_engine'", "./server/processes/common/generic_process.rb:88:in `run_dataset'", "./server/processes/batch.rb:210:in `run_dataset'", "/usr/lib/ruby/1.8/benchmark.rb:293:in `measure'", "./server/processes/batch.rb:209:in `run_dataset'", "./server/processes/common/generic_process.rb:159:in `run'", "./server/processes/common/generic_process.rb:158:in `each'", "./server/processes/common/generic_process.rb:158:in `run'", "./server/processes/batch.rb:350:in `run'", "/usr/lib/ruby/1.8/benchmark.rb:293:in `measure'", "./server/processes/batch.rb:349:in `run'", "server/processes/test_runs/run_tests.rb:55:in `run_one_process'", "server/processes/test_runs/run_tests.rb:81"] Any ideas on how to stop this happening?

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• UIWebView not loading URL

  - by jerincbus

  I'm having trouble getting a UIWebView to load a URL that I'm sending to it. Before I get into my code I was wondering if URL has to start with "http://" or can it start with "www."? I'm using an IBAction to push a UIView on to the stack: (IBAction)goToWebView { WebViewController *webController = [[WebViewController alloc] initWithNibName:@"WebViewController" bundle:[NSBundle mainBundle]]; //set the strings webController.webTitle = [self Title]; webController.webURL = [self website]; //Push the new view on the stack [[self navigationController] pushViewController:webController animated:YES]; [webController release]; webController = nil; } Then here is my WebViewController.h file: @interface WebViewController : UIViewController { IBOutlet UIWebView *webView; NSString *webTitle; NSString *webURL; } @property (nonatomic, retain) IBOutlet UIWebView *webView; @property (nonatomic, retain) NSString *webTitle; @property (nonatomic, retain) NSString *webURL; here And my WebViewController.m file: - (void)viewDidLoad { [super viewDidLoad]; NSString *urlAddress = webURL; //Create a URL object. NSURL *url = [NSURL URLWithString:urlAddress]; //URL Requst Object NSURLRequest *requestObj = [NSURLRequest requestWithURL:url]; //Load the request in the UIWebView. [webView loadRequest:requestObj]; }

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• C++ design question on traversing binary trees

  - by user231536

  I have a binary tree T which I would like to copy to another tree. Suppose I have a visit method that gets evaluated at every node: struct visit { virtual void operator() (node* n)=0; }; and I have a visitor algorithm void visitor(node* t, visit& v) { //do a preorder traversal using stack or recursion if (!t) return; v(t); visitor(t->left, v); visitor(t->right, v); } I have 2 questions: I settled on using the functor based approach because I see that boost graph does this (vertex visitors). Also I tend to repeat the same code to traverse the tree and do different things at each node. Is this a good design to get rid of duplicated code? What other alternative designs are there? How do I use this to create a new binary tree from an existing one? I can keep a stack on the visit functor if I want, but it gets tied to the algorithm in visitor. How would I incorporate postorder traversals here ? Another functor class?

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• Base 128 or 256 Encoding for the Binary Lexical Octet Adhoc Transport Protocol?

  - by Randolpho

  I'm in the process of implementing a network driver for the Binary Lexical Octet Adhoc Transport (BLOAT) protocols in the hopes of replacing the TCP/UDP/IP stack with a much more flexible XML structure. BLOAT is detailed in RFC 3252, so if you're unfamiliar with the protocol I highly recommend you read the entire RFC before providing any comments. Don't worry, it's short and sweet; you might even enjoy it. Anyway, my problem is this: BLOAT requires that the payload be Base64 encoded which doesn't make sense to me. I mean, sure, it's the internet standard for binary payloads, but there are better, more efficient encodings available: Base128 and Base256, for example. That the RFC requires Base64 and doesn't allow for any other payload encoding really bothers me. To that end, I'm considering a small optional change to the protocol. Embrace and extend, right? Anyway, I'd like to modify the payload element to accept an encoding attribute, which can extend the encoding to Base128 or Base256, or even to other encodings I can't conceive of at the moment. If the encoding attribute isn't present, Base64 would be assumed. So my question is this: should I? I mean, BLOAT is an accepted standard, even if it isn't exactly omnipresent. If I make this change, will there be compatibility issues? I don't foresee any, but perhaps you, oh great Stack Overflow Community, can? If I do implement this change, should I contact the original RFC author? Should I offer a supplemental RFC?

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• MySQL performance

  - by kapil.israni

  Hi, I have this LAMP application with about 900k rows in MySQL and I am having some performance issues. Background - Apart from the LAMP stack , there's also a Java process (multi-threaded) that runs in its own JVM. So together with LAMP & java, they form the complete solution. The java process is responsible for inserts/updates and few selects as well. These inserts/updates are usually in bulk/batch, anywhere between 5-150 rows. The PHP front-end code only does SELECT's. Issue - the PHP/SELECT queries become very slow when the java process is running. When the java process is stopped, SELECT's perform alright. I mean the performance difference is huge. When the java process is running, any action performed on the php front-end results in 80% and more CPU usage for mysqld process. Any help would be appreciated. MySQL is running with default parameters & settings. Software stack - Apache - 2.2.x MySQL -5.1.37-1ubuntu5 PHP - 5.2.10 Java - 1.6.0_15 OS - Ubuntu 9.10 (karmic)

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• Most efficient way of creating tree from adjacency list

  - by Jeff Meatball Yang

  I have an adjacency list of objects (rows loaded from SQL database with the key and it's parent key) that I need to use to build an unordered tree. It's guaranteed to not have cycles. This is taking wayyy too long (processed only ~3K out of 870K nodes in about 5 minutes). Running on my workstation Core 2 Duo with plenty of RAM. Any ideas on how to make this faster? public class StampHierarchy { private StampNode _root; private SortedList<int, StampNode> _keyNodeIndex; // takes a list of nodes and builds a tree // starting at _root private void BuildHierarchy(List<StampNode> nodes) { Stack<StampNode> processor = new Stack<StampNode>(); _keyNodeIndex = new SortedList<int, StampNode>(nodes.Count); // find the root _root = nodes.Find(n => n.Parent == 0); // find children... processor.Push(_root); while (processor.Count != 0) { StampNode current = processor.Pop(); // keep a direct link to the node via the key _keyNodeIndex.Add(current.Key, current); // add children current.Children.AddRange(nodes.Where(n => n.Parent == current.Key)); // queue the children foreach (StampNode child in current.Children) { processor.Push(child); nodes.Remove(child); // thought this might help the Where above } } } } public class StampNode { // properties: int Key, int Parent, string Name, List<StampNode> Children }

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• NoSuchMethod exception when using scala Regex class... confused...

  - by hbatista

  Hi there, I have a simple Scala project that runs without any problems inside Eclipse, however, when packaged into a .jar I receive this exception when running it: Exception in thread "AWT-EventQueue-0" java.lang.NoSuchMethodError: scala.util.matching.Regex.replaceAllIn(Ljava/lang/CharSequence;Lscala/Function1;)Ljava/lang/String; What is going on here?... The code line in question, and the full stack are below. This is the offending line: "alt=\"[^>]+\">".r.replaceAllIn(inputStr, {_.replace(">", "/>")}) Full stack: Exception in thread "AWT-EventQueue-0" java.lang.NoSuchMethodError: scala.util.matching.Regex.replaceAllIn(Ljava/lang/CharSequence;Lscala/Function1;)Ljava/lang/String; at com.inosat.fuel.FuelStationDgge.fixhtml(FuelStationDgge.scala:40) at com.inosat.fuel.FuelStationDgge.setDetails(FuelStationDgge.scala:82) at com.inosat.fuel.DggeParser$$anon$1.propertyChange(DggeParser.scala:49) at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source) at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source) at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source) at org.jdesktop.beans.AbstractBean.firePropertyChange(AbstractBean.java:302) at org.jdesktop.http.async.AsyncHttpRequest.setReadyState(AsyncHttpRequest.java:705) at org.jdesktop.http.async.AsyncHttpRequest.access$600(AsyncHttpRequest.java:79) at org.jdesktop.http.async.AsyncHttpRequest$AsyncWorker.done(AsyncHttpRequest.java:831) at javax.swing.SwingWorker$5.run(Unknown Source) at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.run(Unknown Source) at sun.swing.AccumulativeRunnable.run(Unknown Source) at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.actionPerformed(Unknown Source) at javax.swing.Timer.fireActionPerformed(Unknown Source) at javax.swing.Timer$DoPostEvent.run(Unknown Source) at java.awt.event.InvocationEvent.dispatch(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source)

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• Visual Studio Macros on 64 bit fail with COM error

  - by bruce.kinchin

  I'm doing some javascript development and found a cool macro to region my code ("Using #region Directive With JavaScript Files in Visual Studio"). I used this on my 32 bit box, and it worked first time. (Visual Studio 2008 SP1, Win7) For easy of reference the macro is: Option Strict Off Option Explicit Off Imports System Imports EnvDTE Imports EnvDTE80 Imports System.Diagnostics Imports System.Collections Public Module JsMacros Sub OutlineRegions() Dim selection As EnvDTE.TextSelection = DTE.ActiveDocument.Selection Const REGION_START As String = "//#region" Const REGION_END As String = "//#endregion" DTE.ExecuteCommand("Edit.StopOutlining") selection.SelectAll() Dim text As String = selection.Text selection.StartOfDocument(True) Dim startIndex As Integer Dim endIndex As Integer Dim lastIndex As Integer = 0 Dim startRegions As Stack = New Stack() Do startIndex = text.IndexOf(REGION_START, lastIndex) endIndex = text.IndexOf(REGION_END, lastIndex) If startIndex = -1 AndAlso endIndex = -1 Then Exit Do End If If startIndex <> -1 AndAlso startIndex < endIndex Then startRegions.Push(startIndex) lastIndex = startIndex + 1 Else ' Outline region ... selection.MoveToLineAndOffset(CalcLineNumber(text, CInt(startRegions.Pop())), text.Length) selection.MoveToLineAndOffset(CalcLineNumber(text, endIndex) + 1, 1, True) selection.OutlineSection() lastIndex = endIndex + 1 End If Loop selection.StartOfDocument() End Sub Private Function CalcLineNumber(ByVal text As String, ByVal index As Integer) Dim lineNumber As Integer = 1 Dim i As Integer = 0 While i < index If text.Chars(i) = vbCr Then lineNumber += 1 i += 1 End If i += 1 End While Return lineNumber End Function End Module I then tried to use the same macro on two separate 64 bit machines (Win7 x64), identical other than the 64 bit OS version and it fails to work. Stepping through it with the Visual Studio Macros IDE, it fails the first time on the DTE.ExecuteCommand("Edit.StopOutlining") line with a COM error (Error HRESULT E_FAIL has been returned from a call to a COM component). If I attempt to run it a second time, I can run it from the Macro Editor with no issue, but not from within Visual Studio with the macro explorer 'run macro' command. I have reviewed the following articles without finding anything helpful: Stackoverflow: Visual Studio 2008 macro only works from the Macro IDE, not the Macro Explorer Recorded macro does not run; Failing on DTE.ExecuteCommand Am I missing something dumb?

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• git push heroku master gives error ssh: connect to host heroku.com port 22: Connection refused

  - by user1476508

  I'm trying to run the heroku-django tutorial (using ubuntu 12.04) and it seems for some reason i cant push into heroku. here is what happens: yeinhorn@ubuntu:~/hellodjango$ git init Reinitialized existing Git repository in /home/yeinhorn/hellodjango/.git/ yeinhorn@ubuntu:~/hellodjango$ git add . yeinhorn@ubuntu:~/hellodjango$ git commit -m "my first commit" On branch master nothing to commit (working directory clean) yeinhorn@ubuntu:~/hellodjango$ heroku create Creating high-dusk-6308... done, stack is cedar http://high-dusk-6308.herokuapp.com/ | [email protected]:high-dusk-6308.git ! New default stack: Cedar. To use Bamboo, run heroku create -s bamboo. yeinhorn@ubuntu:~/hellodjango$ git remote -v heroku [email protected]:blazing-dusk-8587.git (fetch) heroku [email protected]:blazing-dusk-8587.git (push) yeinhorn@ubuntu:~/hellodjango$ git push heroku master ssh: connect to host heroku.com port 22: Connection refused fatal: The remote end hung up unexpectedly yeinhorn@ubuntu:~/hellodjango$ git push -f heroku ssh: connect to host heroku.com port 22: Connection refused fatal: The remote end hung up unexpectedly also when i run $telnet heroku.com 22 i get Trying 50.19.85.132... Trying 50.19.85.154... Trying 50.19.85.156... telnet: Unable to connect to remote host: Connection refused any ideas?

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• Can I make a "TCP packet modifier" using tun/tap and raw sockets?

  - by benhoyt

  I have a Linux application that talks TCP, and to help with analysis and statistics, I'd like to modify the data in some of the TCP packets that it sends out. I'd prefer to do this without hacking the Linux TCP stack. The idea I have so far is to make a bridge which acts as a "TCP packet modifier". My idea is to connect to the application via a tun/tap device on one side of the bridge, and to the network card via raw sockets on the other side of the bridge. My concern is that when you open a raw socket it still sends packets up to Linux's TCP stack, and so I couldn't modify them and send them on even if I wanted to. Is this correct? A pseudo-C-code sketch of the bridge looks like: tap_fd = open_tap_device("/dev/net/tun"); raw_fd = open_raw_socket(); for (;;) { select(fds = [tap_fd, raw_fd]); if (FD_ISSET(tap_fd, &fds)) { read_packet(tap_fd); modify_packet_if_needed(); write_packet(raw_fd); } if (FD_ISSET(raw_fd, &fds)) { read_packet(raw_fd); modify_packet_if_needed(); write_packet(tap_fd); } } Does this look possible, or are there other better ways of achieving the same thing? (TCP packet bridging and modification.)

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• Parsec: backtracking not working

  - by Nathan Sanders

  I am trying to parse F# type syntax. I started writing an [F]Parsec grammar and ran into problems, so I simplified the grammar down to this: type ::= identifier | type -> type identifier ::= [A-Za-z0-9.`]+ After running into problems with FParsec, I switched to Parsec, since I have a full chapter of a book dedicated to explaining it. My code for this grammar is typeP = choice [identP, arrowP] identP = do id <- many1 (digit <|> letter <|> char '.' <|> char '`') -- more complicated code here later return id arrowP = do domain <- typeP string "->" range <- typeP return $ "("++domain++" -> "++range++")" run = parse (do t <- typeP eof return t) "F# type syntax" The problem is that Parsec doesn't backtrack by default, so > run "int" Right "int" -- works! > run "int->int" Left "F# type syntax" unexpected "-" expecting digit, letter, ".", "`" or end of input -- doesn't work! The first thing I tried was to reorder typeP: typeP = choice [arrowP, identP] But this just stack overflows because the grammar is left-recursive--typeP never gets to trying identP because it keeps trying arrowP over and over. Next I tried try in various places, for example: typeP = choice [try identP, arrowP] But nothing I do seems to change the basic behaviours of (1) stack overflow or (2) non-recognition of "-" following an identifier. My mistake is probably obvious to anybody who has successfully written a Parsec grammar. Can somebody point it out?

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• Hiding a UINavigationController's UIToolbar during viewWillDisappear:

  - by Nathan de Vries

  I've got an iPhone application with a UITableView menu. When a row in the table is selected, the appropriate view controller is pushed onto the application's UINavigationController stack. My issue is that the MenuViewController does not need a toolbar, but the UIViewControllers which are pushed onto the stack do. Each UIViewController that gets pushed calls setToolbarHidden:animated: in viewDidAppear:. To hide the toolbar, I call setToolbarHidden:animated: in viewWillDisappear:. Showing the toolbar works, such that when the pushed view appears the toolbar slides up and the view resizes correctly. However, when the back button is pressed the toolbar slides down but the view does not resize. This means that there's a black strip along the bottom of the view as the other view transitions in. I've tried adding the toolbar's height to the height of the view prior to hiding the toolbar, but this causes the view to be animated during the transition so that there's still a black bar. I realise I can manage my own UIToolbar, but I'd like to use UINavigationControllers built in UIToolbar for convenience. This forum post mentions the same issue, but no workaround is mentioned.

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• PHP PCRE differences on testing and hosting servers

  - by Gary Pearman

  Hi all, I've got the following regular expression that works fine on my testing server, but just returns an empty string on my hosted server. $text = preg_replace('~[^\\pL\d]+~u', $use, $text); Now I'm pretty sure this comes down to the hosting server version of PCRE not being compiled with Unicode property support enabled. The differences in the two versions are as follows: My server: PCRE version 7.8 2008-09-05 Compiled with UTF-8 support Unicode properties support Newline sequence is LF \R matches all Unicode newlines Internal link size = 2 POSIX malloc threshold = 10 Default match limit = 10000000 Default recursion depth limit = 10000000 Match recursion uses stack Hosting server: PCRE version 4.5 01-December-2003 Compiled with UTF-8 support Newline character is LF Internal link size = 2 POSIX malloc threshold = 10 Default match limit = 10000000 Match recursion uses stack Also note that the version on the hosting server (the same version PHP is compiled against) is pretty old. What confuses me though, is that pcretest fails on both servers from the command line with re> ~[^\\pL\d]+~u ** Unknown option 'u' although this regexp works fine when run from PHP on my server. So, I guess my questions are does the regular expression fail on the hosting server because of the lack of Unicode properties? Or is there something else that I'm missing? Thanks all, Gaz.

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• [NSCFNumber _isNaturallyRTL]: unrecognized selector sent to instance 0x605ac10

  - by Risma

  my app got crashed an showed that keyword. There is no error and warning. can some body help me?? this is stack that showed : Call stack at first throw: ( 0 CoreFoundation 0x012ccbe9 __exceptionPreprocess + 185 1 libobjc.A.dylib 0x014215c2 objc_exception_throw + 47 2 CoreFoundation 0x012ce6fb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187 3 CoreFoundation 0x0123e366 ___forwarding___ + 966 4 CoreFoundation 0x0123df22 _CF_forwarding_prep_0 + 50 5 UIKit 0x0042d35e -[UITextField setText:] + 53 6 Koder232_risma_edited 0x0006427a -[FilePropertiesViewController viewWillAppear:] + 442 7 UIKit 0x003c4d52 -[UIView(Hierarchy) _willMoveToWindow:withAncestorView:] + 207 8 UIKit 0x003cfa2b -[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:] + 378 9 UIKit 0x003cfa5c -[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:] + 427 10 UIKit 0x003cfa5c -[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:] + 427 11 UIKit 0x003c6b36 -[UIView(Internal) _addSubview:positioned:relativeTo:] + 370 12 UIKit 0x003c514f -[UIView(Hierarchy) addSubview:] + 57 13 UIKit 0x006ad8ae -[UIPopoverView presentFromRect:inView:contentSize:backgroundStyle:animated:] + 1920 14 UIKit 0x006a0a4c -[UIPopoverView presentFromRect:inView:animated:] + 236 15 UIKit 0x006d9b20 -[UIPopoverController presentPopoverFromRect:inView:permittedArrowDirections:animated:] + 1046 16 Koder232_risma_edited 0x0001f90f -[codeViewController arrangeTabWithTypeGesture:andNumtag:] + 4683 17 Koder232_risma_edited 0x0001e68f -[codeViewController setTap2:] + 99 18 UIKit 0x0061e9c7 -[UIGestureRecognizer _updateGestureWithEvent:] + 727 19 UIKit 0x0061a9d6 -[UIGestureRecognizer _delayedUpdateGesture] + 47 20 UIKit 0x00620fa5 _UIGestureRecognizerUpdateObserver + 584 21 UIKit 0x0062118a _UIGestureRecognizerUpdateGesturesFromSendEvent + 51 22 UIKit 0x003bc6b4 -[UIWindow _sendGesturesForEvent:] + 1292 23 UIKit 0x003b7f87 -[UIWindow sendEvent:] + 105 24 UIKit 0x0039b37a -[UIApplication sendEvent:] + 447 25 UIKit 0x003a0732 _UIApplicationHandleEvent + 7576 26 GraphicsServices 0x0191fa36 PurpleEventCallback + 1550 27 CoreFoundation 0x012ae064 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52 28 CoreFoundation 0x0120e6f7 __CFRunLoopDoSource1 + 215 29 CoreFoundation 0x0120b983 __CFRunLoopRun + 979 30 CoreFoundation 0x0120b240 CFRunLoopRunSpecific + 208 31 CoreFoundation 0x0120b161 CFRunLoopRunInMode + 97 32 GraphicsServices 0x0191e268 GSEventRunModal + 217 33 GraphicsServices 0x0191e32d GSEventRun + 115 34 UIKit 0x003a442e UIApplicationMain + 1160 35 Koder232_risma_edited 0x00002680 main + 102 36 Koder232_risma_edited 0x00002611 start + 53 37 ??? 0x00000001 0x0 + 1 )

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• nasm/yasm arguments, linkage to C++

  - by arionik

  Hello everybody, I've got a question concerning nasm and its linkage to C++. I declare a litte test function as extern "C" void __cdecl myTest( byte i1, byte i2, int stride, int *width ); and I call it like this: byte i1 = 1, i2 = 2; int stride = 3, width = 4; myTest( i1, i2, stride, &width ); the method only serves to debug assembly and have a look at how the stack pointer is used to get the arguments. beyond that, the pointer arguments value shall be set to 7, to figure out how that works. This is implemented like this: global _myTest _myTest: mov eax, [esp+4] ; 1 mov ebx, [esp+8] ; 2 mov ecx, dword [esp+16] ; width mov edx, dword [esp+12] ; stride mov eax, dword [esp+16] mov dword [eax], 7 ret and compiled via yasm -f win32 -g cv8 -m x86 -o "$(IntDir)\$(InputName).obj" "$(InputPath)" , then linked to the c++ app. In debug mode, everything works fine. the function is called a couple of times and works as expected, whereas in release mode the function works once, but subsequent programm operations fail. It seems to me that something's wrong with stack/frame pointers, near/far, but I'm quite new to this subject and need a little help. thanks in advance! a.

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• Error displaying a WinForm in Design mode with a custom control on it.

  - by George

  I have a UserControl that is part of a Class library. I reference this project from my solution. This adds a control from the referenced project to my toolbox. I add tghe control to a form. Everything looks good, I compile all and run. Perfect... But when I close the .frm with the control on it and re-open it, I get this error. The code continues to run. It may have something to do with namespaces. The original namespace was simply "Design" and this was ambiguous and conflicting so i decided to rename it. I think that's when my problems began. To prevent possible data loss before loading the designer, the following errors must be resolved: 2 Errors Ignore and Continue Why am I seeing this page? Could not find type 'Besi.Winforms.HtmlEditor.Editor'. Please make sure that the assembly that contains this type is referenced. If this type is a part of your development project, make sure that the project has been successfully built using settings for your current platform or Any CPU. Instances of this error (1) 1. There is no stack trace or error line information available for this error. Help with this error Could not find an associated help topic for this error. Check Windows Forms Design-Time error list Forum posts about this error Search the MSDN Forums for posts related to this error The variable 'Editor1' is either undeclared or was never assigned. Go to code Instances of this error (1) 1. BesiAdmin frmOrder.Designer.vb Line:775 Column:1 Show Call Stack at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.Error(IDesignerSerializationManager manager, String exceptionText, String helpLink) at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeExpression(IDesignerSerializationManager manager, String name, CodeExpression expression) at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeExpression(IDesignerSerializationManager manager, String name, CodeExpression expression) at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeStatement(IDesignerSerializationManager manager, CodeStatement statement) Help with this error MSDN Help Forum posts about this error Search the MSDN Forums for posts related to this error

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• Xcode raises exception when refactoring

  - by Sam Gwydir

  When I run a refactor on my code in xcode, all the files are correctly refactored except one, and when I click to check the changes made in that file, the following 'Internal Error Occurs': Uncaught Exception: Invalid parameter not satisfying: fileName Stack Backtrace: The stack backtrace has been logged to the console. Here is what it spat out in the console: 4/7/10 06:47:30 Xcode[35355] [MT] Uncaught Exception: Invalid parameter not satisfying: fileName Backtrace: 0 0x92842bbd __raiseError (in CoreFoundation) 1 0x914b9509 objc_exception_throw (in libobjc.A.dylib) 2 0x92842908 +[NSException raise:format:arguments:] (in CoreFoundation) 3 0x98801dc3 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] (in Foundation) 4 0x98db0f8e -[NSDocument(NSDeprecated) initWithContentsOfFile:ofType:] (in AppKit) 5 0x0075c07e -[PBXTextFileDocument initWithContentsOfFile:ofType:] (in DevToolsInterface) 6 0x007dc5be -[PBXFileDocument initWithFileReference:usingType:] (in DevToolsInterface) 7 0x00b1c0f8 -[XCRefactoringFileChangeSet(XCRefactoringModule_HelperMethods) referencedTextFileDocument] (in DevToolsInterface) 8 0x00b1d1f4 -[XCRefactoringEditableExistingTextFileChangeSet populateComparator:] (in DevToolsInterface) 9 0x00ab19b7 -[XCRefactoringModuleFileItem populateComparator:previewFinished:] (in DevToolsInterface) 10 0x00aa4606 -[XCRefactoringModule(MasterListDelegate) outlineViewSelectionDidChange:] (in DevToolsInterface) 11 0x987381cb _nsnote_callback (in Foundation) 12 0x927ca3f9 __CFXNotificationPost (in CoreFoundation) 13 0x927c9e2a _CFXNotificationPostNotification (in CoreFoundation) 14 0x9872d098 -[NSNotificationCenter postNotificationName:object:userInfo:] (in Foundation) 15 0x9873a475 -[NSNotificationCenter postNotificationName:object:] (in Foundation) 16 0x98af1de2 -[NSTableView _enableSelectionPostingAndPost] (in AppKit) 17 0x98bd11d0 -[NSTableView mouseDown:] (in AppKit) 18 0x98bcfeea -[NSOutlineView mouseDown:] (in AppKit) 19 0x007596c3 -[PBXExtendedOutlineView mouseDown:] (in DevToolsInterface) 20 0x98b6e548 -[NSWindow sendEvent:] (in AppKit) 21 0x00757a06 -[XCWindow sendEvent:] (in DevToolsInterface) 22 0x98a871af -[NSApplication sendEvent:] (in AppKit) 23 0x006f6dec -[PBXExtendedApplication sendEvent:] (in DevToolsInterface) 24 0x98a1ac4f -[NSApplication run] (in AppKit) 25 0x98a12c85 NSApplicationMain (in AppKit) 26 0x0000eee1 27 0x000021a5 If you would like to take a look at the project I'm working on, here is a link to download my xcodeproject: Tea Timer.zip To recreate my problem, open Timer.h, attempt to refactor timeField to minuteField, use the preview function of refactor and then select Timer.m, to look at the changes supposedly made within. It will then raise this error without editing the file.

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• Removing padding from structure in kernel module

  - by dexkid

  I am compiling a kernel module, containing a structure of size 34, using the standard command. make -C /lib/modules/$(KVERSION)/build M=$(PWD) modules The sizeof(some_structure) is coming as 36 instead of 34 i.e. the compiler is padding the structure. How do I remove this padding? Running make V=1 shows the gcc compiler options passed as make -I../inc -C /lib/modules/2.6.29.4-167.fc11.i686.PAE/build M=/home/vishal/20100426_eth_vishal/organised_eth/src modules make[1]: Entering directory `/usr/src/kernels/2.6.29.4-167.fc11.i686.PAE' test -e include/linux/autoconf.h -a -e include/config/auto.conf || ( \ echo; \ echo " ERROR: Kernel configuration is invalid."; \ echo " include/linux/autoconf.h or include/config/auto.conf are missing."; \ echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ echo; \ /bin/false) mkdir -p /home/vishal/20100426_eth_vishal/organised_eth/src/.tmp_versions ; rm -f /home/vishal/20100426_eth_vishal/organised_eth/src/.tmp_versions/* make -f scripts/Makefile.build obj=/home/vishal/20100426_eth_vishal/organised_eth/src gcc -Wp,-MD,/home/vishal/20100426_eth_vishal/organised_eth/src/.eth_main.o.d -nostdinc -isystem /usr/lib/gcc/i586-redhat-linux/4.4.0/include -Iinclude -I/usr/src/kernels/2.6.29.4-167.fc11.i686.PAE/arch/x86/include -include include/linux/autoconf.h -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Os -m32 -msoft-float -mregparm=3 -freg-struct-return -mpreferred-stack-boundary=2 -march=i686 -mtune=generic -Wa,-mtune=generic32 -ffreestanding -DCONFIG_AS_CFI=1 -DCONFIG_AS_CFI_SIGNAL_FRAME=1 -pipe -Wno-sign-compare -fno-asynchronous-unwind-tables -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -Iarch/x86/include/asm/mach-generic -Iarch/x86/include/asm/mach-default -Wframe-larger-than=1024 -fno-stack-protector -fno-omit-frame-pointer -fno-optimize-sibling-calls -g -pg -Wdeclaration-after-statement -Wno-pointer-sign -fwrapv -fno-dwarf2-cfi-asm -DTX_DESCRIPTOR_IN_SYSTEM_MEMORY -DRX_DESCRIPTOR_IN_SYSTEM_MEMORY -DTX_BUFFER_IN_SYSTEM_MEMORY -DRX_BUFFER_IN_SYSTEM_MEMORY -DALTERNATE_DESCRIPTORS -DEXT_8_BYTE_DESCRIPTOR -O0 -Wall -DT_ETH_1588_051 -DALTERNATE_DESCRIPTORS -DEXT_8_BYTE_DESCRIPTOR -DNETHERNET_INTERRUPTS -DETH_IEEE1588_TESTS -DSNAPTYPSEL_TMSTRENA_TEVENTENA_TESTS -DT_ETH_1588_140_147 -DLOW_DEBUG_PRINTS -DMEDIUM_DEBUG_PRINTS -DHIGH_DEBUG_PRINTS -DMODULE -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(eth_main)" -D"KBUILD_MODNAME=KBUILD_STR(conxt_eth)" -c -o /home/vishal/20100426_eth_vishal/organised_eth/src/eth_main.o /home/vishal/20100426_eth_vishal/organised_eth/src/eth_main.c

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• struts2: Redirect from global interceptor

  - by Dewfy

  In struts2 I have very simple task, after user is logged-in I'm checking if they profile is complete. If not user should be blocked from any other action and redirected to edit page. So I have created my default package: <package name="main" extends="tiles-default" > <interceptors> <interceptor name="checkProfile" class="my.CheckProfileInterceptor" /> <interceptor-stack name="secure"> <interceptor-ref name="defaultStack"/> <interceptor-ref name="checkProfile"/> </interceptor-stack> </interceptors> <default-interceptor-ref name="secure"/> </package> After it all my packages would include this template as a base: <package namespace="/packageA" name="packageA" extends="main"> ... <package namespace="/packageB" name="packageB" extends="main"> ... Saying editing page is /packageA/editProfile, my interceptor does following: public String intercept(ActionInvocation actionInvocation) throws Exception { if( currentUser.isOk() ) return "editProfile"; ... BUT! interceptor is global, so it raises struts2 error: No result defined for action (name of editProfile action class) When interceptor is placed inside some package - then everything ok. What should i do to declare global action?

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• What are the primitive Forth operators?

  - by Barry Brown

  I'm interested in implementing a Forth system, just so I can get some experience building a simple VM and runtime. When starting in Forth, one typically learns about the stack and its operators (DROP, DUP, SWAP, etc.) first, so it's natural to think of these as being among the primitive operators. But they're not. Each of them can be broken down into operators that directly manipulate memory and the stack pointers. Later one learns about store (!) and fetch (@) which can be used to implement DUP, SWAP, and so forth (ha!). So what are the primitive operators? Which ones must be implemented directly in the runtime environment from which all others can be built? I'm not interested in high-performance; I want something that I (and others) can learn from. Operator optimization can come later. (Yes, I'm aware that I can start with a Turing machine and go from there. That's a bit extreme.) Edit: What I'm aiming for is akin to bootstrapping an operating system or a new compiler. What do I need do implement, at minimum, so that I can construct the rest of the system out of those primitive building blocks? I won't implement this on bare hardware; as an educational exercise, I'd write my own minimal VM.

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