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• Objective-C memory management issue

  - by Toby Wilson

  I've created a graphing application that calls a web service. The user can zoom & move around the graph, and the program occasionally makes a decision to call the web service for more data accordingly. This is achieved by the following process: The graph has a render loop which constantly renders the graph, and some decision logic which adds web service call information to a stack. A seperate thread takes the most recent web service call information from the stack, and uses it to make the web service call. The other objects on the stack get binned. The idea of this is to reduce the number of web service calls to only those appropriate, and only one at a time. Right, with the long story out of the way (for which I apologise), here is my memory management problem: The graph has persistant (and suitably locked) NSDate* objects for the currently displayed start & end times of the graph. These are passed into the initialisers for my web service request objects. The web service call objects then retain the dates. After the web service calls have been made (or binned if they were out of date), they release the NSDate*. The graph itself releases and reallocates new NSDates* on the 'touches ended' event. If there is only one web service call object on the stack when removeAllObjects is called, EXC_BAD_ACCESS occurs in the web service call object's deallocation method when it attempts to release the date objects (even though they appear to exist and are in scope in the debugger). If, however, I comment out the release messages from the destructor, no memory leak occurs for one object on the stack being released, but memory leaks occur if there are more than one object on the stack. I have absolutely no idea what is going wrong. It doesn't make a difference what storage symantics I use for the web service call objects dates as they are assigned in the initialiser and then only read (so for correctness' sake are set to readonly). It also doesn't seem to make a difference if I retain or copy the dates in the initialiser (though anything else obviously falls out of scope or is unwantedly released elsewhere and causes a crash). I'm sorry this explanation is long winded, I hope it's sufficiently clear but I'm not gambling on that either I'm afraid. Major big thanks to anyone that can help, even suggest anything I may have missed?

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• Are defining many JQuery event handlers "expensive?" Internally Implemented at C/C++ or JavaScrip

  - by Pete Alvin

  I have a long a web form. I'm wondering if I should bind() to each element separately (what I really want) or should I only define one bind() all of the input elements then do an if-then inside the handler to handle the specific element?

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• How can I deny users to add/modify/remove printers to cups ?

  - by ajcaruana

  Hi, I am using Mac OS X 10.6. I wrote a program which will add and remove printers to a CUPS server using libcups. It works, but now I am considering the security aspects. This program takes a user name and password to authenticate on the CUPS server. Whatever user name and password I use, it works as long as it is valid on the system. How do I restrict access to only a specific user ? Regards Alan

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• Horizontal scrolling in a wx.RichTextCtrl

  - by Sam

  I have a RichTextCtrl created as follows: self.userlist = wx.richtext.RichTextCtrl(self, style=wx.TE_MULTILINE|wx.TE_READONLY|wx.HSCROLL) It all works fine, except for the wx.HSCROLL style. If I change the RichTextCtrl to a regular TextCtrl, it correctly horizontal scrolls on long lines, rather than wrapping, but on the RichTextCtrl it wraps regardless. Is there an easy way to make it scroll horizontally? (I do, unfortunately, need the RichTextCtrl's featureset for this object.)

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• What's a good xmlns alias for the WpfApplication1.Properties namespace?

  - by CannibalSmith

  I know I can call it whatever, but just like there is a convention for project's namespace (xmlns:local), is there a good name I could call the Properties namespace so that any coder could walk up to my code and instantly recognize it? Currently, I use xmlns:Properties, but that's too long in my opinion.

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• Scroll to a position in a listView

  - by klaus-vlad

  Hi, I have a long listView that the user scrolls around and then returns to the previous menu . What I want is that when the user opens this list View again the list to be scrolled to where the it was previously left. Any ideas on how this can be achieved ?

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• Better alternative to autonumber primary keys

  - by Comrad_Durandal

  I am looking for a better primary key than the autonumber data type, namely for the reason that it's limited to a long integer, when I really just need the field to reflect a number or text string that will never ever repeat, no matter HOW many records are added or deleted from the table. The problem is I am not sure how to implement something like turning the current date and time into a hexadecimal string and using that as a unique field I can use as a primary key. Am I just being too paranoid about running out of space?

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• Poor performance / speed of regex with lookahead

  - by Hugo Zaragoza

  I have been observing extremely slow execution times with expressions with several lookaheads. I suppose that this is due to underlying data structures, but it seems pretty extreme and I wonder if I do something wrong or if there are known work-arounds. The problem is determining if a set of words are present in a string, in any order. For example we want to find out if two terms "term1" AND "term2" are somewhere in a string. I do this with the expresion: (?=.*\bterm1\b)(?=.*\bterm2\b) But what I observe is that this is an order of magnitude slower than checking first just \bterm1\b and just then \bterm2\b This seems to indicate that I should use an array of patterns instead of a single pattern with lookaheads... is this right? it seems wrong... Here is an example test code and resulting times: public static void speedLookAhead() { Matcher m, m1, m2; boolean find; int its = 1000000; // create long non-matching string char[] str = new char[2000]; for (int i = 0; i < str.length; i++) { str[i] = 'x'; } String test = str.toString(); // First method: use one expression with lookaheads m = Pattern.compile("(?=.*\\bterm1\\b)(?=.*\\bterm2\\b)").matcher(test); long time = System.currentTimeMillis(); ; for (int i = 0; i < its; i++) { m.reset(test); find = m.find(); } time = System.currentTimeMillis() - time; System.out.println(time); // Second method: use two expressions and AND the results m1 = Pattern.compile("\\bterm1\\b").matcher(test); m2 = Pattern.compile("\\bterm2\\b").matcher(test); time = System.currentTimeMillis(); ; for (int i = 0; i < its; i++) { m1.reset(test); m2.reset(test); find = m1.find() && m2.find(); } time = System.currentTimeMillis() - time; System.out.println(time); } This outputs in my computer: 1754 150

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• how to convert a binary data into interger?

  - by kaki

  when I am using the wave_read.readframes() I am getting the result in binary data such as /x00/x00/x00:/x16#/x05" etc a very long string when asked for single frame it gives @/x00 or \xe3\xff or so I want this individual frame data in integer how can I convert them into integer to store them into array.

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• Easy Python input question

  - by Josh K

  I'd like to have something similar to the following pseudo code: while input is not None and timer < 5: input = getChar() timer = time.time() - start if timer >= 5: print "took too long" else: print input Anyway to do this without threading? I would like an input method that returns whatever has been entered since the last time it was called, or None (null) if nothing was entered.

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• How can I background the R process in ESS / Emacs?

  - by Conor

  I often run long R scripts when I start my R environment. I would like to be able to load / run the R script in Emacs / ESS and continue other work in another buffer. When I press C-g or C-c C-c the process is interrupted, and I must restart the script. What is the best way to background the R process in ESS / Emacs?

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• How can i received the Lat / Lng points on -ANY- mobile device?

  - by Frederico

  Google Latitude does a great job with this, i'm trying to access this information as well.. it seems like their service has a much better way of finding the lat long on phones that don't have the html5 capability.. Thank you in advance.

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• crowd website simulation on localhost for a php/mysql project

  - by Mac Taylor

  hey guys I searched for a while on how to find a benchmarking software that can simulate crowd website with more than 1000 users online to find out leaks in my php/mysql script . as long as i ran my script for a huge community and it wasn't successful enough and lots of RAM usage happened , now I need a way to simulate that much usage to benchmark my script and optimize it . I am using XAMMP Local Server and my project written in PHP&MYSQL. thanks in advance

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• Is there a simpler way to redirect using a route while adding paramters in Kohana?

  - by Darryl Hein

  I find myself doing the following or similar quite often: Request::instance()->redirect(Route::get('route')->uri(array('action' => 'action'))); Or: Request::instance()->redirect(Route::get(Route::name(Request::instance()->route))->uri(array('action' => 'action'))); I'm wondering if there's any short, easier, simpler way of doing this. I love the Route functionality, but it makes for some long lines of PHP.

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• Programmer's obligation of the software developed for a client.

  - by jeffreyandlilia

  Am i obligated to give the source code and support of the software I have created for a client especially if the client wanted to add some functionalities? For how long?

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• Store password temporarily in memory

  - by Nils

  Hello, I'm looking for a way in an Android application to store a password within the memory as long as the application is running (cf. different activities). I was first thinking about the SharedPreferences, but then it's saved in the flash memory, which isn't that good for a password, I guess. I'm unsure, what's the best way. What would you recommend me?

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• MySQL - Calculate the net time difference between two date-times while excluding breaks?

  - by John M

  In a MySQL query I am using the timediff/time_to_sec functions to calculate the total minutes between two date-times. For example: 2010-03-23 10:00:00 - 2010-03-23 08:00:00 = 120 minutes What I would like to do is exclude any breaks that occur during the selected time range. For example: 2010-03-23 10:00:00 - 2010-03-23 08:00:00 - (break 08:55:00 to 09:10:00) = 105 minutes Is there a good method to do this without resorting to a long list of nested IF statements?

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• How does Cell Minute Tracker work?

  - by embedded

  It's been a mystery how does Cell Minute Tracker manage to fetch AT&T users data. Maybe someone here has the long waited answer. I'm really curious rather they got a confirmation to scrape user’s cellular report And how they can fire up multiple requests to AT&T site without being banned? I'm waiting for someone who could shed some light on this mystery Thanks link: http://www.uquery.com/apps/311637771-cell-minute-tracker-for-att

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• Does SQL Server have any kind of magic undo feature?

  - by Andrew G. Johnson

  Long story short is I tried to quickly update a single row in SQL Server using the Management studio and just typed UPDATE table SET column='value' and forgot the WHERE other_column='other_value' portion. Went for lunch, came back and theres 15 unread emails waiting for me. Happened about an hour ago, waiting for the database guy to come back to see when the last backup was. There's no magic UNDO feature though is there?

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• How to bring a form in the top of desktop?

  - by Kovu

  hi, I will let popup a form in C#.net 2.0 and it should be so long in front of the desktop until the user clicks the close button. How to do? I tried the code from here: http://dotnet-snippets.de/dns/fenster-wirklich-in-den-vordergrund-des-desktops-bringen-SID1005.aspx But it didn't work. My system is Win7.

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• Good value for declaring "Position reached" in geo coords

  - by poeschlorn

  Hi Guys, I've written a kind of navigation system for pedestrians. The only thing is, that I need a criterion to finish the navigation. My values are gives as lat/long pairs. What would you assume would be a good value to say, both positions are equal/near enough to tell the user that he has reached the goal? Please keep also in mind, that it's idfficult to say "directly equal", because GPS modules may have variances... greetz from europe, poeschlorn

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• How to display a route between two geocoords in google maps? (Android)

  - by poeschlorn

  Hi guys, I'm just writing an App for displaying the route between two coords (lat, long) in google maps view. Displaying an single coord (even with a marker) works fine, but how to do this with 2 ones and the route between them? I must admit that I'm quite new to Android and the maps-API...

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• Corpus/data set of English words with syllabic stress information?

  - by endtime

  I know this is a long shot, but does anyone know of a dataset of English words that has stress information by syllable? Something as simple as the following would be fantastic: AARD vark A ble a BOUT ac COUNT AC id ad DIC tion ad VERT ise ment ... Thanks in advance!

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• Forcing postback on selection of a radio button

  - by coffeeaddict

  I know this is simple as cake but I've been using ASP.NET controls for way too long. I assume you have to do this via javascript with a regular XHTML input tag?

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• unique hash of string

  - by Aly

  Hi, I want to create a unique hash (16 chars long) of an arbitrary length String. Is there a good library that implements MD5 or SHA-1 for C++ with which I can achieve this? (and possibly an example of how to use it)

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