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• Does RabbitMq do round-robin from the exchange to the queues

  - by Lancelot

  Hi, I am currently evaluating message queue systems and RabbitMq seems like a good candidate, so I'm digging a little more into it. To give a little context I'm looking to have something like one exchange load balancing the message publishing to multiple queues. I don't want to replicate the messages, so a fanout exchange is not an option. Also the reason I'm thinking of having multiple queues vs one queue handling the round-robin w/ the consumers, is that I don't want our single point of failure to be at the queue level. Sounds like I could add some logic on the publisher side to simulate that behavior by editing the routing key and having the appropriate bindings in place. But that's kind of a passive approach that wouldn't take the pace of the message consumption on each queue into account, potentially leading to fill up one queue if the consumer applications for that queue are dead. I was looking for a more pro-active way from the exchange entity side, that would decide where to send the next message based on each queue size or something of that nature. I read about Alice and the available RESTful APIs but that seems kind of a heavy duty solution to implement fast routing decisions. Anyone knows if round-robin between the exchange the queues is feasible w/ RabbitMQ then? Thanks.

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• Mixing NIO with IO

  - by Steffen Heil

  Hi Usually you have a single bound tcp port and several connections on these. At least there are usually more connections as bound ports. My case is different: I want to bind a lot of ports and usually have no (or at least very few) connections. So I want to use NIO to accept the incoming connections. However, I need to pass the accepted connections to the existing jsch ssh library. That requires IO sockets instead of NIO sockets, it spawns one (or two) thread(s) per connection. But that's fine for me. Now, I thought that the following lines would deliver the very same result: Socket a = serverSocketChannel.accept().socket(); Socket b = serverSocketChannel.socket().accep(); SocketChannel channel = serverSocketChannel.accpet(); channel.configureBlocking( true ); Socket c = channel.socket(); Socket d = serverSocket.accept(); However the getInputStream() and getOutputStream() functions of the returned sockets seem to work different. Only if the socket was accepted using the last call, jsch can work with it. In the first three cases, it fails (and I am sorry: I don't know why). So is there a way to convert such a socket? Regards, Steffen

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• ASP.NET MVC Concurrency with RowVersion in Edit Action

  - by Jorin

  I'm wanting to do a simple edit form for our Issue Tracking app. For simplicity, the HttpGet Edit action looks something like this: // Issues/Edit/12 public ActionResult Edit(int id) { var thisIssue = edmx.Issues.First(i => i.IssueID == id); return View(thisIssue); } and then the HttpPost action looks something like this: [HttpPost] public ActionResult Edit(int id, FormCollection form) { // this is the dumb part where I grab the object before I update it. // concurrency is sidestepped here. var thisIssue = edmx.Issues.Single(c => c.IssueID == id); TryUpdateModel(thisIssue); if (ModelState.IsValid) { edmx.SaveChanges(); TempData["message"] = string.Format("Issue #{0} successfully modified.", id); return RedirectToAction("Index"); } return View(thisIssue); } Which works wonderfully. However, the concurrency check doesn't work because in the Post, I'm re-retreiving the current entity right before I attempt to update it. However, with EF, I don't know how to use the fanciness of SaveChanges() but attach my thisIssue to the context. I tried to call edmx.Issues.Attach(thisIssue) but I get The object cannot be attached because it is already in the object context. An object can only be reattached when it is in an unchanged state. How do I handle concurrency in MVC with EF and/or how do I properly Attach my edited object to the context? Thanks in advance

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• Java Simple Chat Box

  - by Allen

  I am trying to create a very simple chat window that simply has the ability to display some text, which i add to from time to time. However I get the following run time error when attempting to append text to the window: java.lang.ClassCastException: javax.swing.JViewport cannot be cast to javax.swing.JTextPane at ChatBox.getTextPane(ChatBox.java:41) at ChatBox.getDocument(ChatBox.java:45) at ChatBox.addMessage(ChatBox.java:50) at ImageTest2.main(ImageTest2.java:160) Here is the class to handle the basic operations: public class ChatBox extends JScrollPane { private Style style; public ChatBox() { StyleContext context = new StyleContext(); StyledDocument document = new DefaultStyledDocument(context); style = context.getStyle(StyleContext.DEFAULT_STYLE); StyleConstants.setAlignment(style, StyleConstants.ALIGN_LEFT); StyleConstants.setFontSize(style, 14); StyleConstants.setSpaceAbove(style, 4); StyleConstants.setSpaceBelow(style, 4); JTextPane textPane = new JTextPane(document); textPane.setEditable(false); this.add(textPane); } public JTextPane getTextPane() { return (JTextPane) this.getComponent(0); } public StyledDocument getDocument() { return (StyledDocument) getTextPane().getStyledDocument(); } public void addMessage(String speaker, String message) { String combinedMessage = speaker + ": " + message; StyledDocument document = getDocument(); try { document.insertString(document.getLength(), combinedMessage, style); } catch (BadLocationException badLocationException) { System.err.println("Oops"); } } } if there is a simpler way to do this, by all means let me know. I only need the text to be of a single font type, and uneditable by the user. Aside from that, I just need to be able to append text on the fly.

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• How to Convert using of SqlLit to Simple SQL command in C#

  - by Nasser Hajloo

  I want to get start with DayPilot control I do not use SQLLite and this control documented based on SQLLite. I want to use SQL instead of SQL Lite so if you can, please do this for me. main site with samples http://www.daypilot.org/calendar-tutorial.html The database contains a single table with the following structure CREATE TABLE event ( id VARCHAR(50), name VARCHAR(50), eventstart DATETIME, eventend DATETIME); Loading Events private DataTable dbGetEvents(DateTime start, int days) { SQLiteDataAdapter da = new SQLiteDataAdapter("SELECT [id], [name], [eventstart], [eventend] FROM [event] WHERE NOT (([eventend] <= @start) OR ([eventstart] >= @end))", ConfigurationManager.ConnectionStrings["db"].ConnectionString); da.SelectCommand.Parameters.AddWithValue("start", start); da.SelectCommand.Parameters.AddWithValue("end", start.AddDays(days)); DataTable dt = new DataTable(); da.Fill(dt); return dt; } Update private void dbUpdateEvent(string id, DateTime start, DateTime end) { using (SQLiteConnection con = new SQLiteConnection(ConfigurationManager.ConnectionStrings["db"].ConnectionString)) { con.Open(); SQLiteCommand cmd = new SQLiteCommand("UPDATE [event] SET [eventstart] = @start, [eventend] = @end WHERE [id] = @id", con); cmd.Parameters.AddWithValue("id", id); cmd.Parameters.AddWithValue("start", start); cmd.Parameters.AddWithValue("end", end); cmd.ExecuteNonQuery(); } }

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• Android:Multi touch doesn't work as expected?

  - by user187532

  Hi folks, Help me in resolving the below issue. I have three image buttons on screen. All these three buttons controlled under ontouchlistner as below. buttonOne.setOnTouchListener(this); buttonTwo.setOnTouchListener(this); buttonThree.setOnTouchListener(this); I override "public boolean onTouch(View v, MotionEvent event)". Under this i check for these three image buttons touch events like below. ImageButton imageBtn = (ImageButton) v; if ( imageBtn == buttonOne ) // first button touch ..Log.. else if ( imageBtn == buttonTwo ) ..Log.. else if ( imageBtn == buttonThree ) // first button touch ..Log.. My problem is, as it is under multi touch event handler like above, it does not detect when touch all three button at a time to try to produce multi touch effect, instead it detects only one imagebutton touch at a time even though i touch all three image buttons. As i am developing this project on Android 1.6 SDK, is there any problem accessing my requirement(multi touch) (or) it is a known issue? I am hoping that, when it works for single button touch, why shouldn't it work when clicking three imagebuttons at a time to produce three logs printed as per my above code? How do i resolve it for my case? Please don't question me why i am still developing on 1.6 for such a requirement. Thank you. Appreciate your suggestions !

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• Nonblocking Tcp server

  - by hoodoos

  It's not a question really, i'm just looking for some guidelines :) I'm currently writing some abstract tcp server which should use as low number of threads as it can. Currently it works this way. I have a thread doing listening and some worker threads. Listener thread is just sits and wait for clients to connect I expect to have a single listener thread per server instance. Worker threads are doing all read/write/processing job on clients socket. So my problem is in building efficient worker process. And I came to some problem I can't really solve yet. Worker code is something like that(code is really simple just to show a place where i have my problem): List<Socket> readSockets = new List<Socket>(); List<Socket> writeSockets = new List<Socket>(); List<Socket> errorSockets = new List<Socket>(); while( true ){ Socket.Select( readSockets, writeSockets, errorSockets, 10 ); foreach( readSocket in readSockets ){ // do reading here } foreach( writeSocket in writeSockets ){ // do writing here } // POINT2 and here's the problem i will describe below } it works all smothly accept for 100% CPU utilization because of while loop being cycling all over again, if I have my clients doing send-receive-disconnect routine it's not that painful, but if I try to keep alive doing send-receive-send-receive all over again it really eats up all CPU. So my first idea was to put a sleep there, I check if all sockets have their data send and then putting Thread.Sleep in POINT2 just for 10ms, but this 10ms later on produces a huge delay of that 10ms when I want to receive next command from client socket.. For example if I don't try to "keep alive" commands are being executed within 10-15ms and with keep alive it becomes worse by atleast 10ms :( Maybe it's just a poor architecture? What can be done so my processor won't get 100% utilization and my server to react on something appear in client socket as soon as possible? Maybe somebody can point a good example of nonblocking server and architecture it should maintain?

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• simple Stata program

  - by Cyrus S

  I am trying to write a simple program to combine coefficient and standard error estimates from a set of regression fits. I run, say, 5 regressions, and store the coefficient(s) and standard error(s) of interest into vectors (Stata matrix objects, actually). Then, I need to do the following: Find the mean value of the coefficient estimates. Combine the standard error estimates according to the formula suggested for combining results from "multiple imputation". The formula is the square root of the formula for "T" on page 6 of the following document: http://bit.ly/b05WX3 I have written Stata code that does this once, but I want to write this as a function (or "program", in Stata speak) that takes as arguments the vector (or matrix, if possible, to combine multiple estimates at once) of regression coefficient estimates and the vector (or matrix) of corresponding standard error estimates, and then generates 1 and 2 above. Here is the code that I wrote: (breg is a 1x5 vector of the regression coefficient estimates, and sereg is a 1x5 vector of the associated standard error estimates) mat ones = (1,1,1,1,1) mat bregmean = (1/5)*(ones*breg’) scalar bregmean_s = bregmean[1,1] mat seregmean = (1/5)*(ones*sereg’) mat seregbtv = (1/4)*(breg - bregmean#ones)* (breg - bregmean#ones)’ mat varregmi = (1/5)*(sereg*sereg’) + (1+(1/5))* seregbtv scalar varregmi_s = varregmi[1,1] scalar seregmi = sqrt(varregmi_s) disp bregmean_s disp seregmi This gives the right answer for a single instance. Any pointers would be great! UPDATE: I completed the code for combining estimates in a kXm matrix of coefficients/parameters (k is the number of parameters, m the number of imputations). Code can be found here: http://bit.ly/cXJRw1 Thanks to Tristan and Gabi for the pointers.

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• Is there more to HTML forms than http://www.w3schools.com/html/html_forms.asp ?

  - by mawg

  I am creating a form designer. It will generate PHP code which will produce an HTML form. Users will fill in fields and the PHP will store user input in a MySql database (and, of course, they can use the designer to generate forms which query the database). I am using Borland C++ Builder (very similar to Delphi & and you can get the same idea from VB, MSVC, Qt ... any IDE with a RAD GUI designer). Looking at the W3C page http://www.w3schools.com/html/html_forms.asp it seems that the components I can use for my form and retrieve data from are - edit box / TEdit / <input type="text" - memo / TMemo / <input type="textarea" - check box / TCheckBox / <input type="CheckBox" - Combo box / TComboBox / <select ... <option... - Radio group / TRadioGroup / <input type="radio" - Group box / TGroupBox / <fieldset ... <legend ... - Panel / TPanel / <fieldset ... I am unsure whether to allow button / TButton/ input type="button" - other than a single submit button which my form designer program automatically adds to the end of the generated form. But my real question is - did I miss any? It might be nice to have masked edit which only accepts numbers, or maybe some form of "spin control" (TUpDown, or slider + linked read only TEdit), so that the user can click & hold to increment/decrement an integer value. And a calendar component would be nice. Very important: I want to implement it all server-side in PHP, so no client-side JS or Ajax or the likes. If there anything else that I can add to make my generated forms look more impressive in the browser?

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• Complex data types in WCF?

  - by Hojou

  I've run into a problem trying to return an object that holds a collection of childobjects that again can hold a collection of grandchild objects. I get an error, 'connection forcibly closed by host'. Is there any way to make this work? I currently have a structure resembling this: pseudo code: Person: IEnumerable<Order> Order: IEnumberable<OrderLine> All three objects have the DataContract attribute and all public properties i want exposed (including the IEnumerable's) have the DataMember attribute. I have multiple OperationContract's on my service and all the methods returning a single object OR an IEnumerable of an object works perfectly. It's only when i try to nest IEnumerable that it turns bad. Also in my client service reference i picked the generic list as my collection type. I just want to emphasize, only one of my operations/methods fail with this error - the rest of them work perfectly. EDIT (more detailed error description): [SocketException (0x2746): An existing connection was forcibly closed by the remote host] [IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.] [WebException: The underlying connection was closed: An unexpected error occurred on a receive.] [CommunicationException: An error occurred while receiving the HTTP response to http://myservice.mydomain.dk/MyService.svc. This could be due to the service endpoint binding not using the HTTP protocol. This could also be due to an HTTP request context being aborted by the server (possibly due to the service shutting down). See server logs for more details.] I tried looking for logs but i can't find any... also i'm using a WSHttpBinding and an http endpoint.

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• C# wrapper and Callbacks

  - by fergs

  I'm in the process of writing a C# wrapper for Dallmeier Common API light (Camera & Surviellance systems) and I've never written a wrapper before, but I have used the Canon EDSDK C# wrapper. So I'm using the Canon wrapper as a guide to writing the Dallmeier wrapper. I'm currently having issues with wrapping a callback. In the API manual it has the following: dlm_connect int(unsigned long uLWindowHandle, const char * strIP, const char* strUser1, const char* strPwd1, const char* strUser2, const char* strPwd2, void (*callback)(void *pParameters, void *pResult, void *pInput), void * pInput) Arguments - ulWindowhandle - handle of the window that is passed to the ViewerSDK to display video and messages there - strUser1/2 - names of the users to log in. If only single user login is used strUser2 is - NULL - strPwd1/2 - passwords of both users. If strUser2 is NULL strPwd2 is ignored. Return This function creates a SessionHandle that has to be passed Callback pParameters will be structured: - unsigned long ulFunctionID - unsigned long ulSocketHandle, //handle to socket of the established connection - unsigned long ulWindowHandle, - int SessionHandle, //session handle of the session created - const char * strIP, - const char* strUser1, - const char* strPwd1, - const char* strUser2, - const char * strPWD2 pResult is a pointer to an integer, representing the result of the operation. Zero on success. Negative values are error codes. So from what I've read on the Net and Stack Overflow - C# uses delegates for the purpose of callbacks. So I create a my Callback function : public delegate uint DallmeierCallback(DallPparameters pParameters, IntPtr pResult, IntPtr pInput); I create the connection function [DllImport("davidapidis.dll")] public extern static int dlm_connect(ulong ulWindowHandle, string strIP, string strUser1, string strPwd1, string strUser2, string strPwd2, DallmeierCallback inDallmeierFunc And (I think) the DallPParameters as a struct : [StructLayout(LayoutKind.Sequential)] public struct DallPParameters { public ulong ulfunctionID; public ulong ulsocketHandle; public ulong ulWindowHandle; ... } All of this is in my wrapper class. Am I heading in the right direction or is this completely wrong?

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• Visual Studio project using the Quality Center API remains in memory

  - by Traveling Tech Guy

  Hi, Currently developing a connector DLL to HP's Quality Center. I'm using their (insert expelative) COM API to connect to the server. An Interop wrapper gets created automatically by VStudio. My solution has 2 projects: the DLL and a tester application - essentially a form with buttons that call functions in the DLL. Everything works well - I can create defects, update them and delete them. When I close the main form, the application stops nicely. But when I call a function that returns a list of all available projects (to fill a combo box), if I close the main form, VStudio still shows the solution as running and I have to stop it. I've managed to pinpoint a single function in my code that when I call, the solution remains "hung" and if I don't, it closes well. It's a call to a property in the TDC object get_VisibleProjects that returns a List (not the .Net one, but a type in the COM library) - I just iterate over it and return a proper list (that I later use to fill the combo box): public List<string> GetAvailableProjects() { List<string> projects = new List<string>(); foreach (string project in this.tdc.get_VisibleProjects(qcDomain)) { projects.Add(project); } return projects; } My assumption is that something gets retained in memory. If I run the EXE outside of VStudio it closes - but who knows what gets left behind in memory? My question is - how do I get rid of whatever calling this property returns? Shouldn't the GC handle this? Do I need to delve into pointers? Things I've tried: getting the list into a variable and setting it to null at the end of the function Adding a destructor to the class and nulling the tdc object Stepping through the tester function application all the way out, whne the form closes and the Main function ends - it closes, but VStudio still shows I'm running. Thanks for your assistance!

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• Mapping parent-child relationships with iBatis

  - by agnul

  I have the classic setup public class Parent { Integer id; ... // No generics Collection someCollectionAttribute; ... public void setChildren(Collection c) { ... } } public class Child { Integer id; ... } and I'm trying to map this on the usual table setup using iBatis (version 2.30... don't ask). create table parents ( ID integer primary key ... ) create table children ( ID integer primary key PARENT_ID integer references parents(id) ... ) My mapping file looks like this <resultMap id="ParentResult" groupBy="id"> <result property="id" column="ID" /> ... <result property="children" resultMap="ChildResult" /> </resultMap> <resultMap id="ChildResult"> <result property="id" column="ID" /> <result property="parentId" column="PARENT_ID" /> ... </result> <sql id="loadParent" resultMap="ParentResult"> select P.ID as p1, ..., C.ID as c1, C.PARENT_ID as c2 ... from parents P join children C on (P.ID = C.PARENT_ID) where P.ID = #id# order by P.ID </sql> Doing the usual sqlMap.queryForObject("loadParent", new Integer(42)) at first caused a NullPointerException inside the setChildren setter which apparently is called with a null argument (my bad). Fixing the setter everything works fine, but the logs show that setChildren is called only once before even running a single SQL statement, still with a null argument, so I'm wondering what's going on here. Anyone has any clues?

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• Plot in GNU PLOT

  - by guddi

  I have to plot many lines in GNU PLOT.No problem with the X axis. The problem that I am facing is that most of the plotted lines are at yscale [0-0.05] ,few at range 60-70 and rest at 600-700. These numbers correspond to the y axis scale values. But after I plot I can see only 3 sets of lines all messed up. There is no clearity between the lines. Line at 0 and the line at 0.003 look like one single line. If I set yrange[0:0.05], the lines between this range are clearly vissible. But I want all the lines in the same graph. I have heard of breaking axis's and multi plotting..Can they be useful? how to implement them. Anyone pls help me. Below is the sript set terminal png size 1300,1200 enhanced font 'Verdana,20 set output ' output .png’ set key font 'Verdana,16' set key bottom outside set yrange[500:1000] set xtics("25k" 25000,"50k" 50000,"75k" 75000,"100k" 100000) set grid set title 'Performance Metrics' set ylabel 'Metrices' set xlabel 'FES' plot ' input ' using 1:2 title ' A' with linespoints linewidth 4, ' input ' using 1:3 title B'with linespoints linewidth 4, 'input ' using 1:4 title ' c' with linespoints linewidth 4, 'input ' using 1:5 title 'D' with linespoints linewidth 4, ' input ' using 1:6 title 'E' with linespoints linewidth 4, ' input ' using 1:7 title 'F' with linespoints linewidth 4, ' input ' using 1:8 title 'G' with linespoints linewidth 4, ' input ' using 1:9 title ' H ' with linespoints linewidth 4, ' input ' using 1:10 title ' I' Metric ' with linespoints linewidth 4 set output set terminal windows input.dat is something like this: 25 0.002 0.05 899 455 444 0.08 0.00004 900 700 0.003 This way i have other rows. I have shown only the first one

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• Proving f (f bool) = bool

  - by Marcus Whybrow

  How can I in coq, prove that a function f that accepts a bool true|false and returns a bool true|false (shown below), when applied twice to a single bool true|false would always return that same value true|false: (f:bool -> bool) For example the function f can only do 4 things, lets call the input of the function b: Always return true Always return false Return b (i.e. returns true if b is true vice versa) Return not b (i.e. returns false if b is true and vice vera) So if the function always returns true: f (f bool) = f true = true and if the function always return false we would get: f (f bool) = f false = false For the other cases lets assum the function returns not b f (f true) = f false = true f (f false) = f true = false In both possible input cases, we we always end up with with the original input. The same holds if we assume the function returns b. So how would you prove this in coq? Goal forall (f:bool -> bool) (b:bool), f (f b) = f b.

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• Mutability design patterns in Objective C and C++

  - by Mac

  Having recently done some development for iPhone, I've come to notice an interesting design pattern used a lot in the iPhone SDK, regarding object mutability. It seems the typical approach there is to define an immutable class NSFoo, and then derive from it a mutable descendant NSMutableFoo. Generally, the NSFoo class defines data members, getters and read-only operations, and the derived NSMutableFoo adds on setters and mutating operations. Being more familiar with C++, I couldn't help but notice that this seems to be a complete opposite to what I'd do when writing the same code in C++. While you certainly could take that approach, it seems to me that a more concise approach is to create a single Foo class, mark getters and read-only operations as const functions, and also implement the mutable operations and setters in the same class. You would then end up with a mutable class, but the types Foo const*, Foo const& etc all are effectively the immutable equivalent. I guess my question is, does my take on the situation make sense? I understand why Objective-C does things differently, but are there any advantages to the two-class approach in C++ that I've missed? Or am I missing the point entirely? Not an overly serious question - more for my own curiosity than anything else.

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• Creating a WCF ServiceHost object takes three to four minutes on some PCs

  - by Steve

  Hello, I have created a WCF service which does not use the app.config to configure itself. However, it takes three to four minutes on some PCs to construct the ServiceHost object. Thinking there was something wrong with my service, I constructed a simple Hello, World service and tried it with that. I have the same issue. According to the profiler, all this time is spent reading in configuration for the service. So I have two questions really. Is it possible to disable reading config from the XML? More importantly, does anyone have any idea why this might be taking such an inordinate amount of time? Here is the sample service: [ServiceContract] public interface IMyService { [OperationContract] string GetString(); } [ServiceBehavior(InstanceContextMode=InstanceContextMode.Single)] public class MyService : IMyService { public string GetString() { return "Hello, world!"; } } class Program { static void Main(string[] args) { Uri epAddress = new Uri("http://localhost:8731/Test"); Uri[] uris = new Uri[] { epAddress }; MyService srv = new MyService(); ServiceHost host = new ServiceHost(srv, uris); // this line takes 3-4 minutes host.AddServiceEndpoint(typeof(IMyService), new WSHttpBinding(), "Test"); ServiceMetadataBehavior smb = new ServiceMetadataBehavior(); smb.HttpGetEnabled = true; host.Description.Behaviors.Add(smb); host.Open(); return; } } I need for design reasons to create the service and pass it in as an object, rather than passing it in as a type. If there's any more information that can be of use, please let me know. Many thanks.

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• What is the most important thing you weren't taught in school?

  - by Alexandre Brisebois

  What is the most important thing you weren't taught in school? What topics are missing from the CS/IS education? Posted so far How to sell an idea Principles: Often, good enough is better than perfect. Making mistakes is actually a Good Thing™ -- as long as they're new mistakes. If a user can break your code they will. In the Real World™ they're all open-book exams Self confidence is way more important in getting ahead than intelligence. Always prefer simplicity over complexity. The best code is the code that you don't write. You never know when you'll meet someone again ... or where. It's always worthwhile to treat people with respect and kindness. Be aware of what you don't know and don't be afraid to ask questions when you need to Missing knowledge: How to communicate effectively. Lack of source control Lack of Softskills experience How to productize code How to write secure code How to formulate problems How to self-measurement. To evaluate ones true competences and market worth. How to debug code How important is backup How to read code on a large scale (being able to adapt and build upon existing projects) Good Regular expressions comprehension How to teach others effectively TDD/Unit testing Critical thinking How to integrate different skills and languages in a single project

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• function getting wrong values

  - by frankie

  so i have this function in C to calculate a power, and i'm using visual c++ 2010 power.h void power(); float get_power(float a, int n); power.c void power() { float a, r; int n; printf("-POWER-\n"); printf("The base: "); scanf("%f", &a); n = -1; while (n < 0) { printf("The power: "); scanf("%d", &n); if (n < 0) { printf("Power must be equal or larger than 0!\n"); } else { r = get_power(a, n); printf("%.2f ^ %d = %.2f", a, n, r); } }; } float get_power(float a, int n) { if (n == 0) { return 1; } return a * get_power(a, n-1); } not the best way to do it, i know, but that's not it when i debug it the values are scanned correctly (that is, the values are correct until just before the function call) but then upon entering the function a becomes 0 and n becomes 1074790400, and you can guess what happens next... the first function is being called from the main file, i included the full code because i really have no idea what could be going on, and i can't even think on how to google for it... strangely, i wrote the function in a single file and it works fine, but it definitely should work both ways any idea why this is happening?

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• Apache and backslashes in mod_rewrite

  - by NuCalTone

  I want to process all incoming requests through a single script (index.php in web-root). So, the following is what currently happens: http://localhost/foo/bar/baz Is routed by Apache (through .htaccess) to: http://localhost/index.php?url=foo/bar/baz This works well, however, in Firefox I am able to do this: http://localhost/foo\ - notice the backslash. And Apache, instead of doing: /index.php?url=foo\ Emits a generic error page saying: Object not found! The requested URL was not found on this server. If you entered the URL manually please check your spelling and try again. If you think this is a server error, please contact the webmaster. Error 404 localhost Apache/2.2.14 (Win32) DAV/2 mod_ssl/2.2.14 OpenSSL/0.9.8l mod_autoindex_color PHP/5.3.1 mod_apreq2-20090110/2.7.1 mod_perl/2.0.4 Perl/v5.10.1 Directly going to: http://localhost/index.php?url=foo\ works without issues, however. All the sites that I've seen on the internet seem to be able to handle backslashes gracefully (e.g., http://stackoverflow.com/tags/php\\\\\). I consider this behavior a bug and I want to force Apache to forward backslashes correctly. Here's my .htaccess file in its entirety: RewriteEngine On RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(.*)$ index.php?url=$1 [L] How can I make this work properly?

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• Sql Querying, group relationships

  - by Jordan

  Hi, Suppose I have two tables: Group ( id integer primary key, someData1 text, someData2 text ) GroupMember ( id integer primary key, group_id foreign key to Group.id, someData text ) I'm aware that my SQL syntax is not correct :) Hopefully is clear enough. My problem is this: I want to load a group record and all the GroupMember records associated with that group. As I see it, there are two options. A single query: SELECT Group.id, Group.someData1, Group.someData2 GroupMember.id, GroupMember.someData FROM Group INNER JOIN GroupMember ... WHERE Group.id = 4; Two queries: SELECT id, someData2, someData2 FROM Group WHERE id = 4; SELECT id, someData FROM GroupMember WHERE group_id = 4; The first solution has the advantage of only being one database round trip, but has the disadvantage of returning redundant data (All group data is duplicated for every group member) The second solution returns no duplicate data but involves two round trips to the database. What is preferable here? I suppose there's some threshold such that if the group sizes become sufficiently large, the cost of returning all the redundant data is going to be greater than the overhead involved with an additional database call. What other things should I be thinking about here? Thanks, Jordan

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• Android Runtime Layout Tutorial

  - by Ryan

  Does anyone know how to perform or have a good reference for doing an activity layout at runtime in android? Here is the code for my activity. I'm sure I'm just neglecting to do something here: package com.isi.sa; import android.app.Activity; import android.os.Bundle; import android.widget.LinearLayout; import android.widget.TextView; public class SimpleAssessmentTest extends Activity { LinearLayout layout; TextView question; @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); layout = new LinearLayout(this); question = new TextView(this); layout.setBackgroundColor(R.color.black); question.setTextColor(R.color.white); question.setText("This is question1"); layout.addView(question); } } As you can see I'm just trying to add a linear layout with a single text view (just for testing purposes) however, when the activity starts I just get a black screen with a title bar of my app name. Thanks

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• Best way to convert wpf triggers to silverlight?

  - by Stewart Armbrecht

  I have developed several custom controls in a wpf application that use triggers. what is the fastest way to convert the code so that I have a single code base that works both in the wpf application and the silverlight applicaiton. Here is a sample of the code: <Style x:Key="sButtonAction" TargetType="Button"> <!--<Setter Property="BitmapEffect" Value="{StaticResource BannerEffect}" />--> <Setter Property="Height" Value="25" /> <Setter Property="Margin" Value="4" /> <Setter Property="Cursor" Value="Hand" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="Button"> <Border x:Name="PART_Border" CornerRadius="10" BorderThickness="{StaticResource sBorderThicknessStandard}" BorderBrush="{StaticResource bColorBorder}" Background="{StaticResource ButtonActionBackground}"> <TextBlock x:Name="PART_TextBlock" Margin="5,2,5,2" HorizontalAlignment="Center" VerticalAlignment="Center" Foreground="White"> <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" /></TextBlock> </Border> <ControlTemplate.Triggers> <Trigger Property="IsMouseOver" Value="True"> <Setter TargetName="PART_TextBlock" Property="Foreground" Value="#990000"></Setter> </Trigger> <Trigger Property="IsPressed" Value="True"> <Setter TargetName="PART_Border" Property="Background" Value="{StaticResource ButtonActionBackgroundSelected}"></Setter> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style>

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• Broken tables in RichTextBox control (word wrap)

  - by Ben Robbins

  We are having problems with the Windows.Forms.RichTextBox control in Visual Studio 2008. We are trying to display text supplied as an RTF file by a 3rd party in a windows forms application (.NET 3.5). In this RTF text file there are tables, which contain text that spans multiple lines. The RTF file displays correctly when opened with either WordPad or Word 2003. However, when we load the RTF file into the RichTextBox control, or copy & paste the whole text (including the table) into the control, the table does not display correctly - the cells are only single line, without wrapping. Here are links to images showing the exact problem: Correctly displayed in WordPad Incorrectly displayed in RichTextBox control I have googled for solutions and 3rd party .net RTF controls without success. I have found this exact problem asked on another forum without an answer (in fact that's where the link to the images come from) so I'm hoping stack overflow does better ;-) My preferred solution would be to use code or a 3rd party control that can correctly render the RTF. However, I suspect the problem is that the RichTextBox control only supports a subset of the full RTF spec, so another option would be to modify the RTF directly to remove the unsupported control codes or otherwise fix the RTF file itself (in which case any information as to what control codes need to be removed or modified would be a huge help).

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• NSOperationQueue bug with dependencies

  - by Daniel

  I am using NSOperation and NSOperationQueue for performing a sequence of operations, all dependent on each other (2 on 1, 3 on 2, etc...). I set the dependency after I create the operations. I am encountering problems when the queue completes: the program crashes in the _release part of the code, apparently when the NSOperations are getting released. Note that they all get released at the end by the queue, because it is only after the very last one which depends on the second last one, which depends on etc... that they can be released. If I remove any dependency, the code runs fine. If I change waitUntilFinished: to NO, it crashes, if it is YES, it does not. I have isolated the problem to the following code which does not use any of my custom classes. NSOperation by default is a class that does absolutely nothing. Yet, this still crashes when all operations have completed. Therefore, it appears I am not using NSOperationQueue properly but can't see what is wrong. I am running on 10.9 and I have noticed that in general Maverick 10.9 is much more sensitive to these issues than 10.8. I call this method from the main Thread with a Menu item: - (void) testOperations:(id)object { NSOperationQueue* queue = [ [ NSOperationQueue alloc ] init ]; NSMutableArray* array = [ NSMutableArray array ]; for ( int i = 0; i < 10000; i++) [ array addObject: [[[ NSOperation alloc ] init ] autorelease ] ]; for ( int i = 1; i < [ array count ]; i++) [[ array objectAtIndex:i ] addDependency:[array objectAtIndex:i-1]]; // remove this and no crash [ queue addOperations: array waitUntilFinished:NO ]; // Change to YES, no crash [ queue autorelease ]; // or release, it does not make a difference, in fact leaking the memory makes no difference: the code crashes when the queue is removing the NSOperations } This will crash every single time with: bool objc::DenseMapBase , objc_object*, unsigned long, objc::DenseMapInfo, true: (EXC_BAD_ACCESS) The full stack is: #0 0x9104d81b in objc::DenseMapBase<objc::DenseMap<objc_object*, unsigned long, true, objc::DenseMapInfo<objc_object*> >, objc_object*, unsigned long, objc::DenseMapInfo<objc_object*>, true>::find(objc_object* const&) () #1 0x910384e3 in _objc_rootReleaseWasZero () #2 0x9104d5d9 in -[NSObject release] () #3 0x99e41224 in CFRelease () #4 0x99e56277 in -[__NSArrayM dealloc] () #5 0x9104d5ef in -[NSObject release] () #6 0x97f62b22 in -[__NSOperationInternal dealloc] () #7 0x9104d5ef in -[NSObject release] () #8 0x97f62ac8 in -[NSOperation dealloc] () #9 0x9104d5ef in -[NSObject release] () #10 0x99e41224 in CFRelease () #11 0x99e56277 in -[__NSArrayM dealloc] () #12 0x9104d5ef in -[NSObject release] () #13 0x97f62b22 in -[__NSOperationInternal dealloc] () #14 0x9104d5ef in -[NSObject release] () #15 0x97f62ac8 in -[NSOperation dealloc] () #16 0x9104d5ef in -[NSObject release] () #17 0x99e41224 in CFRelease () #18 0x99e56277 in -[__NSArrayM dealloc] () #19 0x9104d5ef in -[NSObject release] () #20 0x97f62b22 in -[__NSOperationInternal dealloc] () #21 0x9104d5ef in -[NSObject release] () #22 0x97f62ac8 in -[NSOperation dealloc] () #23 0x9104d5ef in -[NSObject release] () #24 0x99e41224 in CFRelease () #25 0x99e56277 in -[__NSArrayM dealloc] () #26 0x9104d5ef in -[NSObject release] () #27 0x97f62b22 in -[__NSOperationInternal dealloc] () #28 0x9104d5ef in -[NSObject release] () #29 0x97f62ac8 in -[NSOperation dealloc] () #30 0x9104d5ef in -[NSObject release] () #31 0x99e41224 in CFRelease () #32 0x99e56277 in -[__NSArrayM dealloc] () #33 0x9104d5ef in -[NSObject release] () #34 0x97f62b22 in -[__NSOperationInternal dealloc] () #35 0x9104d5ef in -[NSObject release] () #36 0x97f62ac8 in -[NSOperation dealloc] () #37 0x9104d5ef in -[NSObject release] () #38 0x99e41224 in CFRelease () #39 0x99e56277 in -[__NSArrayM dealloc] () #40 0x9104d5ef in -[NSObject release] () #41 0x97f62b22 in -[__NSOperationInternal dealloc] () #42 0x9104d5ef in -[NSObject release] () #43 0x97f62ac8 in -[NSOperation dealloc] () #44 0x9104d5ef in -[NSObject release] () #45 0x99e41224 in CFRelease () #46 0x99e56277 in -[__NSArrayM dealloc] () #47 0x9104d5ef in -[NSObject release] () #48 0x97f62b22 in -[__NSOperationInternal dealloc] () #49 0x9104d5ef in -[NSObject release] () #50 0x97f62ac8 in -[NSOperation dealloc] () #10722 0x9104d5ef in -[NSObject release] () #10723 0x97f62b22 in -[__NSOperationInternal dealloc] () #10724 0x9104d5ef in -[NSObject release] () #10725 0x97f62ac8 in -[NSOperation dealloc] () #10726 0x9104d5ef in -[NSObject release] () #10727 0x99e41224 in CFRelease () #10728 0x99e56277 in -[__NSArrayM dealloc] () #10729 0x9104d5ef in -[NSObject release] () #10730 0x97f62b22 in -[__NSOperationInternal dealloc] () #10731 0x9104d5ef in -[NSObject release] () #10732 0x97f62ac8 in -[NSOperation dealloc] () #10733 0x9104d5ef in -[NSObject release] () #10734 0x99e41224 in CFRelease () #10735 0x99e56277 in -[__NSArrayM dealloc] () #10736 0x9104d5ef in -[NSObject release] () #10737 0x97f62b22 in -[__NSOperationInternal dealloc] () #10738 0x9104d5ef in -[NSObject release] () #10739 0x97f62ac8 in -[NSOperation dealloc] () #10740 0x9104d5ef in -[NSObject release] () #10741 0x99e41224 in CFRelease () #10742 0x99e56277 in -[__NSArrayM dealloc] () #10743 0x9104d5ef in -[NSObject release] () #10744 0x97f62b22 in -[__NSOperationInternal dealloc] () #10745 0x9104d5ef in -[NSObject release] () #10746 0x97f62ac8 in -[NSOperation dealloc] () #10747 0x9104d5ef in -[NSObject release] () #10748 0x99e41224 in CFRelease () #10749 0x99e56277 in -[__NSArrayM dealloc] () #10750 0x9104d5ef in -[NSObject release] () #10751 0x97f62b22 in -[__NSOperationInternal dealloc] () #10752 0x9104d5ef in -[NSObject release] () #10753 0x97f62ac8 in -[NSOperation dealloc] () #10754 0x9104d5ef in -[NSObject release] () #10755 0x99e41224 in CFRelease () #10756 0x99e56277 in -[__NSArrayM dealloc] () #10757 0x9104d5ef in -[NSObject release] () #10758 0x97f62b22 in -[__NSOperationInternal dealloc] () #10759 0x9104d5ef in -[NSObject release] () #10760 0x97f62ac8 in -[NSOperation dealloc] () #10761 0x9104d5ef in -[NSObject release] () #10762 0x99e41224 in CFRelease () #10763 0x99e56277 in -[__NSArrayM dealloc] () #10764 0x9104d5ef in -[NSObject release] () #10765 0x97f62b22 in -[__NSOperationInternal dealloc] () #10766 0x9104d5ef in -[NSObject release] () #10767 0x97f62ac8 in -[NSOperation dealloc] () #10768 0x9104d5ef in -[NSObject release] () #10769 0x99e41224 in CFRelease () #10770 0x99e56277 in -[__NSArrayM dealloc] () #10771 0x9104d5ef in -[NSObject release] () #10772 0x97f62b22 in -[__NSOperationInternal dealloc] () #10773 0x9104d5ef in -[NSObject release] () #10774 0x97f62ac8 in -[NSOperation dealloc] () #10775 0x9104d5ef in -[NSObject release] () #10776 0x99e41224 in CFRelease () #10777 0x99e56277 in -[__NSArrayM dealloc] () #10778 0x9104d5ef in -[NSObject release] () #10779 0x97f62b22 in -[__NSOperationInternal dealloc] () #10780 0x9104d5ef in -[NSObject release] () #10781 0x97f62ac8 in -[NSOperation dealloc] () #10782 0x9104d5ef in -[NSObject release] () #10783 0x99e41224 in CFRelease () #10784 0x99e56277 in -[__NSArrayM dealloc] () #10785 0x9104d5ef in -[NSObject release] () #10786 0x97f62b22 in -[__NSOperationInternal dealloc] () #10787 0x9104d5ef in -[NSObject release] () #10788 0x97f62ac8 in -[NSOperation dealloc] () #10789 0x9104d5ef in -[NSObject release] () #10790 0x99e41224 in CFRelease () #10791 0x99e56277 in -[__NSArrayM dealloc] () #10792 0x9104d5ef in -[NSObject release] () #10793 0x97f62b22 in -[__NSOperationInternal dealloc] () #10794 0x9104d5ef in -[NSObject release] () #10795 0x97f62ac8 in -[NSOperation dealloc] () #10796 0x9104d5ef in -[NSObject release] () #10797 0x99e41224 in CFRelease () #10798 0x99e56277 in -[__NSArrayM dealloc] () #10799 0x9104d5ef in -[NSObject release] () #10800 0x97f62b22 in -[__NSOperationInternal dealloc] () #10801 0x9104d5ef in -[NSObject release] () #10802 0x97f62ac8 in -[NSOperation dealloc] () #10803 0x9104d5ef in -[NSObject release] () #10804 0x99e41224 in CFRelease () #10805 0x99e56277 in -[__NSArrayM dealloc] () #10806 0x9104d5ef in -[NSObject release] () #10807 0x97f62b22 in -[__NSOperationInternal dealloc] () #10808 0x9104d5ef in -[NSObject release] () #10809 0x97f62ac8 in -[NSOperation dealloc] () #10810 0x9104d5ef in -[NSObject release] () #10811 0x99e41224 in CFRelease () #10812 0x99e56277 in -[__NSArrayM dealloc] () #10813 0x9104d5ef in -[NSObject release] () #10814 0x97f62b22 in -[__NSOperationInternal dealloc] () #10815 0x9104d5ef in -[NSObject release] () #10816 0x97f62ac8 in -[NSOperation dealloc] () #10817 0x9104d5ef in -[NSObject release] () #10818 0x99e41224 in CFRelease () #10819 0x99e56277 in -[__NSArrayM dealloc] () #10820 0x9104d5ef in -[NSObject release] () #10821 0x97f62b22 in -[__NSOperationInternal dealloc] () #10822 0x9104d5ef in -[NSObject release] () #10823 0x97f62ac8 in -[NSOperation dealloc] () #10824 0x9104d5ef in -[NSObject release] () #10825 0x99e41224 in CFRelease () #10826 0x99e56277 in -[__NSArrayM dealloc] () #10827 0x9104d5ef in -[NSObject release] () #10828 0x97f62b22 in -[__NSOperationInternal dealloc] () #10829 0x9104d5ef in -[NSObject release] () #10830 0x97f62ac8 in -[NSOperation dealloc] () #10831 0x9104d5ef in -[NSObject release] () #10832 0x99e41224 in CFRelease () #10833 0x99e56277 in -[__NSArrayM dealloc] () #10834 0x9104d5ef in -[NSObject release] () #10835 0x97f62b22 in -[__NSOperationInternal dealloc] () #10836 0x9104d5ef in -[NSObject release] () #10837 0x97f62ac8 in -[NSOperation dealloc] () #10838 0x9104d5ef in -[NSObject release] () #10839 0x99e41224 in CFRelease () #10840 0x99e56277 in -[__NSArrayM dealloc] () #10841 0x9104d5ef in -[NSObject release] () #10842 0x97f62b22 in -[__NSOperationInternal dealloc] () #10843 0x9104d5ef in -[NSObject release] () #10844 0x97f62ac8 in -[NSOperation dealloc] () #10845 0x9104d5ef in -[NSObject release] () #10846 0x99e41224 in CFRelease () #10847 0x99e56277 in -[__NSArrayM dealloc] () #10848 0x9104d5ef in -[NSObject release] () #10849 0x97f62b22 in -[__NSOperationInternal dealloc] () #10850 0x9104d5ef in -[NSObject release] () #10851 0x97f62ac8 in -[NSOperation dealloc] () #10852 0x9104d5ef in -[NSObject release] () #10853 0x99e41224 in CFRelease () #10854 0x99e56277 in -[__NSArrayM dealloc] () #10855 0x9104d5ef in -[NSObject release] () #10856 0x97f62b22 in -[__NSOperationInternal dealloc] () #10857 0x9104d5ef in -[NSObject release] () #10858 0x97f62ac8 in -[NSOperation dealloc] () #10859 0x9104d5ef in -[NSObject release] () #10860 0x99e41224 in CFRelease () #10861 0x99e56277 in -[__NSArrayM dealloc] () #10862 0x9104d5ef in -[NSObject release] () #10863 0x97f62b22 in -[__NSOperationInternal dealloc] () #10864 0x9104d5ef in -[NSObject release] () #10865 0x97f62ac8 in -[NSOperation dealloc] () #10866 0x9104d5ef in -[NSObject release] () #10867 0x99e41224 in CFRelease () #10868 0x99e56277 in -[__NSArrayM dealloc] () #10869 0x9104d5ef in -[NSObject release] () #10870 0x97f62b22 in -[__NSOperationInternal dealloc] () #10871 0x9104d5ef in -[NSObject release] () #10872 0x97f62ac8 in -[NSOperation dealloc] () #10873 0x9104d5ef in -[NSObject release] () #10874 0x99e41224 in CFRelease () #10875 0x99e56277 in -[__NSArrayM dealloc] () #10876 0x9104d5ef in -[NSObject release] () #10877 0x97f62b22 in -[__NSOperationInternal dealloc] () #10878 0x9104d5ef in -[NSObject release] () #10879 0x97f62ac8 in -[NSOperation dealloc] () #10880 0x9104d5ef in -[NSObject release] () #10881 0x99e41224 in CFRelease () #10882 0x99e56277 in -[__NSArrayM dealloc] () #10883 0x9104d5ef in -[NSObject release] () #10884 0x97f62b22 in -[__NSOperationInternal dealloc] () #10885 0x9104d5ef in -[NSObject release] () #10886 0x97f62ac8 in -[NSOperation dealloc] () #10887 0x9104d5ef in -[NSObject release] () #10888 0x99e41224 in CFRelease () #10889 0x99e56277 in -[__NSArrayM dealloc] () #10890 0x9104d5ef in -[NSObject release] () #10891 0x97f62b22 in -[__NSOperationInternal dealloc] () #10892 0x9104d5ef in -[NSObject release] () #10893 0x97f62ac8 in -[NSOperation dealloc] () #10894 0x9104d5ef in -[NSObject release] () #10895 0x99e41224 in CFRelease () #10896 0x99e56277 in -[__NSArrayM dealloc] () #10897 0x9104d5ef in -[NSObject release] () #10898 0x97f62b22 in -[__NSOperationInternal dealloc] () #10899 0x9104d5ef in -[NSObject release] () #10900 0x97f62ac8 in -[NSOperation dealloc] () #10901 0x9104d5ef in -[NSObject release] () #10902 0x99e41224 in CFRelease () #10903 0x99e56277 in -[__NSArrayM dealloc] () #10904 0x9104d5ef in -[NSObject release] () #10905 0x97f62b22 in -[__NSOperationInternal dealloc] () #10906 0x9104d5ef in -[NSObject release] () #10907 0x97f62ac8 in -[NSOperation dealloc] () #10908 0x9104d5ef in -[NSObject release] () #10909 0x99e41224 in CFRelease () #10910 0x99e56277 in -[__NSArrayM dealloc] () #10911 0x9104d5ef in -[NSObject release] () #10912 0x97f62b22 in -[__NSOperationInternal dealloc] () #10913 0x9104d5ef in -[NSObject release] () #10914 0x97f62ac8 in -[NSOperation dealloc] () #10915 0x9104d5ef in -[NSObject release] () #10916 0x97f49cca in __NSOQSchedule_f () #10917 0x9c1c9e21 in _dispatch_async_redirect_invoke () #10918 0x9c1c53a6 in _dispatch_client_callout () #10919 0x9c1c7467 in _dispatch_root_queue_drain () #10920 0x9c1c8732 in _dispatch_worker_thread2 () #10921 0x960c2dab in _pthread_wqthread () The full crash context is (bold for crash line): libobjc.A.dylib`objc::DenseMapBase<objc::DenseMap<objc_object*, unsigned long, true, objc::DenseMapInfo<objc_object*> >, objc_object*, unsigned long, objc::DenseMapInfo<objc_object*>, true>::find(objc_object* const&): 0x9104d800: pushl %ebp 0x9104d801: movl %esp, %ebp 0x9104d803: pushl %esi 0x9104d804: subl $20, %esp 0x9104d807: leal -8(%ebp), %eax 0x9104d80a: movl %eax, 8(%esp) 0x9104d80e: movl 16(%ebp), %eax 0x9104d811: movl %eax, 4(%esp) 0x9104d815: movl 12(%ebp), %esi 0x9104d818: movl %esi, (%esp) **0x9104d81b: calll 0x9104d9b6 ; bool objc::DenseMapBase<objc::DenseMap<objc_object*, unsigned long, true, objc::DenseMapInfo<objc_object*> >, objc_object*, unsigned long, objc::DenseMapInfo<objc_object*>, true>::LookupBucketFor<objc_object*>(objc_object* const&, std::__1::pair<objc_object*, unsigned long> const*&) const** 0x9104d820: movl 12(%esi), %ecx 0x9104d823: shll $3, %ecx 0x9104d826: addl (%esi), %ecx 0x9104d828: movl 8(%ebp), %edx 0x9104d82b: testb %al, %al 0x9104d82d: je 0x9104d836 ; objc::DenseMapBase<objc::DenseMap<objc_object*, unsigned long, true, objc::DenseMapInfo<objc_object*> >, objc_object*, unsigned long, objc::DenseMapInfo<objc_object*>, true>::find(objc_object* const&) + 54 0x9104d82f: movl -8(%ebp), %eax 0x9104d832: movl %eax, (%edx) 0x9104d834: jmp 0x9104d838 ; objc::DenseMapBase<objc::DenseMap<objc_object*, unsigned long, true, objc::DenseMapInfo<objc_object*> >, objc_object*, unsigned long, objc::DenseMapInfo<objc_object*>, true>::find(objc_object* const&) + 56 0x9104d836: movl %ecx, (%edx) 0x9104d838: movl %ecx, 4(%edx) 0x9104d83b: addl $20, %esp 0x9104d83e: popl %esi 0x9104d83f: popl %ebp 0x9104d840: ret $4 0x9104d843: nop I tried using a pre-created queue, this makes no difference. Apparently, with dependencies, this code is a problem with XCode 5.0, 32-bit. Edit: In fact, I can isolate the problem much further. An empty Cocoa Application project in XCOde 5.0 on 10.9 with ARC on and a single method will crash. If it does not on your computer, increase 4269 to anything bigger: - (void)applicationDidFinishLaunching:(NSNotification *)aNotification { NSOperationQueue* aQueue = [[ NSOperationQueue alloc ] init ]; NSMutableArray* array = [ NSMutableArray array ]; for ( int i = 0; i < 4269; i++) [ array addObject: [ [NSOperation alloc ] init ]]; for ( int i = 1; i < [ array count ]; i++) [[ array objectAtIndex:i ] addDependency:[array objectAtIndex:i-1]]; [ aQueue addOperations: array waitUntilFinished:NO ]; }

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