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• Where to start when programming process synchronization algorithms like clone/fork, semaphores

  - by David

  I am writing a program that simulates process synchronization. I am trying to implement the fork and semaphore techniques in C++, but am having trouble starting off. Do I just create a process and send it to fork from the very beginning? Is the program just going to be one infinite loop that goes back and forth between parent/child processes? And how do you create the idea of 'shared memory' in C++, explicit memory address or just some global variable? I just need to get the overall structure/idea of the flow of the program. Any references would be appreciated.

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• set date error on uidatepicker

  - by Matt Facer

  Hi guys, I've been stumped by the code below. I pass a string date to a UIDatePicker which seems to work on most devices, yet on some, it crashes the app. here's the code NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init]; [dateFormat setDateFormat:@"HH:mm"]; NSDate *date = [dateFormat dateFromString:dateStr]; [timePicker setDate:date]; [dateFormat release]; I have a function which passes the "dateStr" variable, as follows, dateStr = @"0:0"; I cannot see what's wrong - as it works for me! (iphone 3.1.3) but it doesnt work for my tester (ipod touch 3.1.3) Can anyone see anything wrong with the code? Thanks v much. any ideas?

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• How do I respond to a specific sequence of key presses?

  - by Sergio Tapia

  The end result is very simple, I have to have something happen when a user types in the letter "n" "o" "t" "e" in that order. 'Note' is the word. I'm making a little application for a friend that will help him take notes, and I want my application to become visible when he types in "note" from anywhere on the machine. Here's what I've got so far: if (e.KeyCode == neededLetter as Keys) { neededLetter = "o"; } I initialize the neededLetter variable with "N" but I'm stuck there. Any help?

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• Sending Subversion Change Log Info Via Hudson

  - by GrumpyCanuck

  I'm trying to integrate Hudson into our development process, and everything is going smooth except for one thing. I had been using Phing to do deployments, and one of the things that was being triggered was an email to our tech support email address containing a list of all the commit messages between the last time code was deployed and the present SVN revision. I was doing something like this: read in a file from the root directory of the currently-deployed application that contains the SVN revision when the app was deployed place that value in a Phing variable insert that value into a command to send the SVN commit messages via email create a file in the root directory of the newly-deployed application that contains the current SVN revision I'd like to be able to add that information to the email that gets sent out by Hudson when a successful build goes out. Any pointers on how to accomplish this task in Hudson would be greatly appreciated.

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• Check if hydrated doctrine result is NULL

  - by iggnition

  Hi, I'm trying to check if a result in my DQL is NULL. I got the following DQL query: $q = self::createQuery("l") ->select('i.*, s.aantal, m.naam, c.cat_naam, a.app_id') ->from('InstalledBase i, i.Spare s, i.Apparaat a, a.Categorie c, a.Merk m') ->execute(); return $q; Now i want to check if the s.aantal is NULL so i do: if(is_null($installedbase->Spare->spare_id)) when the variable is NOT null everything works, but when it is actually NULL i get a E notice message: Notice: Trying to get property of non-object in \installedbase\templates\_index.php on line 29 It does see that it is null though because the if condition is executed. Weird thing is i'm doing the exact same thing on another page where it works no problem. But i must be doing something wrong or stupid since those messages generally don't show for nothing. So can anybody explain this to me? :)

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• protect php result

  - by siko

  hii i had simple php file to protect wmv files from downloading and stolen the file is like this <?php // get-file.php $id = (isset($_GET["id"])) ? strval($_GET["id"]) : "1"; // lookup $url[1] = 'http://mlfat.ledawy.net/Files/eng/moslslat/mosque/1.wmv'; $url[2] = 'URL'; $url[3] = 'URL'; header('Content-Type: text/plain'); echo("$url[$id]"); ?> and i embedd the movies like this http:// mlfat.ledawy.net/Files/eng/moslslat/mosque/mosque.php?id=1 but if you call this link you can find the source url can i have some protection ?? tried a lot of adding a php session variable so that the script can not be accessed directly. thank you

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• jQuery style Constructors in PHP

  - by McB

  Is there a way to instantiate a new PHP object in a similar manner to those in jQuery? I'm talking about assigning a variable number of arguments when creating the object. For example, I know I could do something like: ... //in my Class __contruct($name, $height, $eye_colour, $car, $password) { ... } $p1 = new person("bob", "5'9", "Blue", "toyota", "password"); But I'd like to set only some of them maybe. So something like: $p1 = new person({ name: "bob", eyes: "blue"}); Which is more along the lines of how it is done in jQuery and other frameworks. Is this built in to PHP? Is there a way to do it? Or a reason I should avoid it?

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• Day dreaming about automatic RGB color function in PHP

  - by Sam

  Hello fellow earthlings. A quesion about RGB color and its usefulness in a simple tiny php code: Imagine I have variable $colorA containning a valid six char color. say B1B100, a greenish natural color. Now If I would like to make a new color from that, which is, say, ten steps lighter thatn that original color, roughly. $colorA = B1B100 // original color php code with little color engine lightening stuff up goes here $colorB = ?????? // original color lightened up Is there a php ready function that KNOWS rgb colors something like php function RGB ( input color, what to do, output color) Where what to do could be +/- 255 values of brightness etc etc. Is something like this already possible or am I day dreaming? rgb($colorA, +10, $colorB) If this does not exist, what would be the shortest code for doing this? Link suffices. Suggestions and ideas are answers to me. Thanks.

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• c# application and configuration settings

  - by Maks

  Hi, I never used Settings class before but I found some articles on CodeProject which I'm currently reading (for example http://www.codeproject.com/KB/cs/PropertiesSettings.aspx) but so far I didn't see how to save string array for getting it after application is started next time. For example my application has several FileSystemWatcher instances, with each instance several other directories are connected (for example one FSW instance is monitoring one directory for a change and when it happens it copies some file to several other directories), so I would have one string array with watched paths representing FSW instances, and string array for each of those paths, representing directories that are affected. My question is, what should I use (Settings class or something else), and how should I use that for storing application configuration that is variable number of string arrays? Emphasize is on something I could use very soon as I don't have too much time to make custom class (but would have to if I cannot find solution) or dig into some obscure hacks. Any tutorial link, code snippet would be very helpful. Thanks.

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• Error : The Type Initializer of Deamon.Global threw an exception in c#

  - by srk

  I am using the below class file, where some variables are declared to use in the entire application. Now i used that variable [BlockLogOut] in another class file to make the value True. I just put this below line and getting error in it.. "TypeInitializationException" Global.BlockLogOut = True; The wired thing is, it was working fine for many months and i am getting this error now on the above line. Of course i was modifying some other stuffs in the application, but surely not this class file. What would have been the problem ? namespace Daemon { class Global { public static bool BlockLogOut = false; } }

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• How to pass Endpoint parameter to Endpoint defined as bean in Spring conext

  - by sempa

  I have camel Fileendpoint defined in following way: <bean id="hotfolderEndpoint" class="org.apache.camel.component.file.FileEndpoint" factory-bean="camel" factory-method="getEndpoint"> <constructor-arg ref="hotfolder" /> </bean> I want to define some File parameters such as preMove, move etc. Variable hotfolder is String taken from JNDI and I have no impact on it. When I define property as <bean id="moveExp" class="org.apache.camel.model.language.SimpleExpression"> <property name="expression" value="done/${file:name}"/> </bean> it is not correctly parsed and the file get name done/name

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• How to gain Access to member variables of a class using void pointer but Not Object

  - by mahesh

  Hi, I am trying to access member variables of a class without using object. please let me know how to go about. class TestMem { int a; int b; public: TestMem(){} void TestMem1() { a = 10; b = 20; } }; void (TestMem::*pMem)(); int main(int argc, char* argv[]) { TestMem o1; pMem = &(TestMem::TestMem1); void *p = (void*)&pMem; // How to access a & b member variables using variable p getch(); return 0; }

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• SWT Filedialog Open into home folder

  - by Ivan

  I want to open a FileDialog window into the user home folder (i.e. /home/user or /Users/unsername) I read the user home folder, using System.getProperty: String homefolder = System.getProperty(user.home); And the variable containts the correct home folder. But when i set the filterpath in FileDialog, it opens (in linux) only the /home level not entering into the user home dir. This is the source code: FileDialog dialog = new FileDialog(shell); dialog.setText("Choose a certificate"); String platform = SWT.getPlatform(); String homefolder = System.getProperty("user.home"); dialog.setFilterPath(homefolder); Any idea? Here a screenshot:

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• struts validation problem in IE

  - by user265201

  I am using Struts 2.1.8 and facing validation problem in IE. I am getting the following error An exception occurred: Error. Error message: Invalid argument. I tried out to figure out the cause and found the following. My generated javascript code is: field = form.elements['district.name']; var error = "Enter only alphabets for district"; if (continueValidation && field.value != null && !field.value.match("^[a-zA-Z ]*$")) { addError(field, error); errors = true; } I tried to mock up by putting the same code in a function and calling it in onclick event. The method addError() throws the exception and the reason is field variable. If I change it to field[0], it works fine. How to fix this error?

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• Showing a Toast using "setUncaughtExceptionHandler"

  - by VitalyB

  Hi everyone, I'm trying to do a simple global exception handler in my Android app and I am having troubles: public class TicTacToe extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Thread.currentThread().setUncaughtExceptionHandler(new UncaughtExceptionHandler() { @Override public void uncaughtException(Thread thread, Throwable ex) { Toast.makeText(this, "TOAST", Toast.LENGTH_LONG); } }); setContentView(R.layout.main); } } I'm a rather new with both Android AND java but in .NET that would work. Can't I access local variable from anonymous methods in java? If so, how should I rewrite it? Thanks, Vitaly

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• SoundPlayer causing Memory Leaks?

  - by Nick Udell

  I'm writing a basic writing app in C# and I wanted to have the program make typewriter sounds as you typed. I've hooked the KeyPress event on my RichTextBox to a function that uses a SoundPlayer to play a short wav file every time a key is pressed, however I've noticed after a while my computer slows to a crawl and checking my processes, audiodlg.exe was using 5 GIGABYTES of RAM. The code I'm using is as follows: I initialise the SoundPlayer as a global variable on program start with SoundPlayer sp = new SoundPlayer("typewriter.wav") Then on the KeyPress event I simply call sp.Play(); Does anybody know what's causing the heavy memory usage? The file is less than a second long, so it shouldn't be clogging the thing up too much.

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• Boolean with html helpers

  - by Martin

  What's up with this? The viewmodel variable is a bool with value true. <%= Html.HiddenFor(m => m.TheBool) %> <%= Html.Hidden("IsTimeExpanded",Model.TheBool) %> <input type="hidden" value="<%=Model.TheBool%>" name="TheBool" id="TheBool"> Results in: <input id="TheBool" name="TheBool" value="False" type="hidden"> <input id="TheBool" name="TheBool" value="False" type="hidden"> <input value="True" name="TheBool" id="TheBool" type="hidden"> What am I doing wrong?

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• [jquery/javascript] Trigger function when mouse click inside textarea AND type stop typing...

  - by marc

  Welcome, In short, my website use BBcode system, and i want allow users to preview message without posting it. I'm using JQuery library. I need 3 actions. 1) When user click in textarea i want display DIV what will contain preview, i want animate opening. 2) When user typing, i want dynamical load parsed by PHP code to DIV. (i'm still thinking what will be best option... refresh every 2 seconds, or maybe we can detect and refresh after 1 second of inactivity [stop typing]) 3) When user click outside textarea i want close preview div with animation. For example the PHP parser will have patch /api/parser.php and variable by POST called $_POST['message']. Any idea my digital friends ?

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• Java generics SuppressWarnings("unchecked") mystery

  - by Johannes Ernst

  Why does code alternative(1) compile without warnings, and code alternative(2) produce an "unchecked cast" warning? Common for both: class Foo<T> { Foo( T [] arg ) { } } Alternative (1): class Bar<T> extends Foo<T> { protected static final Object [] EMPTY_ARRAY = {}; @SuppressWarnings("unchecked") Bar() { super( (T []) EMPTY_ARRAY ); } } Alternative (2): class Bar<T> extends Foo<T> { @SuppressWarnings("unchecked") Bar() { super( (T []) EMPTY_ARRAY ); } protected static final Object [] EMPTY_ARRAY = {}; } Alternative (2) produces: javac -Xlint:unchecked Foo.java Bar.java Bar.java:4: warning: [unchecked] unchecked cast super( (T []) EMPTY_ARRAY ); ^ required: T[] found: Object[] where T is a type-variable: T extends Object declared in class Bar 1 warning This is: java version "1.7.0_07" Java(TM) SE Runtime Environment (build 1.7.0_07-b10) Java HotSpot(TM) 64-Bit Server VM (build 23.3-b01, mixed mode)

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• How to calculate real-time stats?

  - by Diego Jancic

  I have a site with millions of users (well, actually it doesn't have any yet, but let's imagine), and I want to calculate some stats like "log-ins in the past hour". The problem is similar to the one described here: http://highscalability.com/blog/2008/4/19/how-to-build-a-real-time-analytics-system.html The simplest approach would be to do a select like this: select count(distinct user_id) from logs where date>='20120601 1200' and date <='20120601 1300' (of course other conditions could apply for the stats, like log-ins per country) Of course this would be really slow, mainly if it has millions (or even thousands) of rows, and I want to query this every time a page is displayed. How would you summarize the data? What should go to the (mem)cache? EDIT: I'm looking for a way to de-normalize the data, or to keep the cache up-to-date. For example I could increment an in-memory variable every time someone logs in, but that would help to know the total amount of logins, not the "logins in the last hour". Hope it's more clear now.

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• Where does complexity bloat from?

  - by AareP

  Many of our design decisions are based on our gut feeling about how to avoid complexity and bloating. Some of our complexity-fears are true, we have plenty of painful experience on throwing away deprecated code. Other times we learn that some particular task isn't really that complex as we though it to be. We notice for example that upkeeping 3000 lines of code in one file isn't that difficult... or that using special purpose "dirty flags" isn't really bad OO practice... or that in some cases it's more convenient to have 50 variables in one class that have 5 different classes with shared responsibilities... One friend has even stated that adding functions to the program isn't really adding complexity to your system. So, what do you think, where does bloated complexity creep from? Is it variable count, function count, code line count, code line count per function, or something else?

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• Paging doesn't work in the Joomla Article Manager in the admin section

  - by SkippyFire

  I inherited a Joomla site that is having a problem with the article manager in the admin section. The pagination doesn't work! If I click the page number, forward, back, or page size, nothing happens! So I found out that someone had previously installed the iJoomla SEO plugin, but it never worked so they removed it. I think it is incompatible with the version I have. I setup a local environment with almost the same setup (I have 5.2.11 vs the servers 5.2.13) with Wamp Server, and I found that some of the session variables are missing! When dumped via print_r(), the $_SESSION variable is missing the "com_content", "global", and "com_plugins" arrays! So I guess that is the reason that paging doesn't work, because the "com_content" array looks like it has paging info in it. (maybe I'm wrong) So I'm running Version 1.5.13 on PHP Version 5.2.13 Anyone know why this would happen? Thanks in advance!

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• Classic ASP result set - ultimate confusion!

  - by Paul

  Consider a simple result set from a mysql query. rs("description") and rs("description").Value should be considered as the same thing. However, depending on how you access them, you get different results (!!) Access rs("description") directly and you are returned a "Field" object. Or, more importantly, use it directly in a call, and you are returned a "Field" object. mydescription = rs("description") + " is the description" Assign it to another variable, and the Value of that object is assigned... mydescription = rs("description") the contents of "mydescription" is a string. Why this difference? At one point in the life of ASP they must have both worked exactly the same, so why have they changed, and how can I change it back?

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• MVC Implementation PHP Zend PDF generation

  - by zod

  Am using Zend framework and PHP Am going to generate a PDF using Zend . So the View is PDF.There is no PHTML. But if i dont use PHTML in view , is it a perfect MVC? if i want to be a perfect MVC shall i do the db retrieval and variable declaration and assigning in controller and use view and use all pdf functions in view phtml file will it make a perfect MVC? What is the advantage of MVC in this case? :-) can i do the include of zend pdf in phtml file or controller php file? what is the difference ?

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• Sending elements of an array as arguments to a method call

  - by Bryce

  I have a method that accepts the splat operator: def hello(foo, *bar) #... do some stuff end I have an array with a variable length that I'd like to send into this hello method: arr1 = ['baz', 'stuff'] arr2 = ['ding', 'dong', 'dang'] I'd like to call the method with arr1 and arr2 as arguments to that method but I keep getting hung up in that *bar is being interpreted as an array instead of individual arguments. To make things more fun, I can't change the hello method at all. I'm looking for something similar to this SO question but in ruby.

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