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Articles indexed Tuesday March 23 2010

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  • shared library path inconsistent from one host to another

    - by yan bellavance
    I built my qt app so that all the Qt modules it uses are contained in the same directory as the executable. It works on the machine I used to build the app and I made sure to test this by removing those shared libraries everywhere except in the current directory of the app. Doing a ldd shows that its looking for those libraries in the current directory and putting the executable by itself fails to open the exectuable. So this is all good but when I transfer this directory to a host machine it still cant find those libraries. what could be the problem?

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  • C# programmer - necessary to learn C/C++?

    - by Kurresmack
    Hey, I have been programming now for a couple of years. But never any low level language. I started off with some java and some VB. Then I went over to VB.NET and now for a while I have been writing C#. As you see, I have never written any low level language where I had to deal with memory management. Is this something I should do, like a route of passage that every programmer should go through? I am a bit keen on trying to perhaps writing in assembler directly. This would suit me personally good as I have 2 parents that have been writing assembler for ages. Is it necessary for a professional programmer these days to know how to manually manage memory?

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  • JSF/Seam - new component instance on submit?

    - by purecharger
    And my confusion with JSF continues. This is a continuation of a question asked yesterday, but I feel it warrants a new question. I have a single seam component that expects a URL parameter to be injected for retrieving a List<String> from a method. This works perfectly on the first navigation to the page. The List is used to display many different selectOneRadio groups that populate a <h:form/>. Now on the submit, I cannot get the URL parameter to be injected or otherwise set on the component! Adding <h:inputHidden/> causes FacesExceptions to be thrown. Then I tried setting the List as an instance variable on the object, and when the subsequent call is made on the submit (which I also do not understand why that is done) I check to see if the variable is non-null: if it isn't, return it. Now I found that a new instance of the component is created on submit!!! getList() called this.toString(): .BeanAction@5fd98420 #### This is when submit is clicked getList() called this.toString(): .BeanAction@22aacbce The component has the following annotations: Stateful @Scope(ScopeType.CONVERSATION) @Name("bean") @Restrict("#{identity.loggedIn}") Can someone explain why there is a new instance of the component created? I'm really not quite sure how to go about handling this. I thought the hidden parameter would work, because that is how I would do it with straight HTML, and I'm a little surprised that its not working for JSF/Seam.

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  • server controlled or Synchronized web slide show?

    - by Gnome Guru
    I am creating a e-learning application , where the students (wireless) connect to the teachers machine, the teacher hosts a tomcat server. the teacher has a set of HTML web-pages(each of which can be thought of as a slide). and the students can view a web slide-show on his/her browser... the problem is.... i want the pages on the students browser to be redirected according to the teachers input.. in short: i want the server to automatically redirect all the client browsers to the next page when the teacher wants it to be so... how do i do it?? [i am using JSP/javascript/Java/Tomcat/Eclipse]

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  • Within an aray of objects can one create a new instance of an object at an index?

    - by David
    Here's the sample code: class TestAO { int[] x; public TestAO () { this.x = new int[5] ; for (int i = 0; i<x.length; i++) x[i] = i; } public static void main (String[]arg) { TestAO a = new TestAO (); System.out.println (a) ; TestAO c = new TestAO () ; c.x[3] = 35 ; TestAO[] Z = new TestAO[3] ; Z[0] = a ; Z[1] = (TestAO b = new TestAO()) ; Z[2] = c ; } } When i try to compile this i get an error message at the line Z[1] which reads as follows: TestAO.java:22: ')' expected Z[1] = (TestAO b = new TestAO()) ; ^ What i'm trying to do here is create an instance of the object TestAO that i want to be in that index within the assignment of the value at that index instead of creating the instance of the object outside of the array like i did with a. Is this legal and i'm just making some syntax error that i can't see (thus causing the error message) or can what i'm trying to do just not be done?

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  • How to free control inside its event handler?

    - by lyborko
    Hi, Does anybody know the trick, how to free control inside its event handler ? According delphi help it is not possible... I want to free dynamicaly created TEdit, when Self.Text=''. TAmountEdit = class (TEdit) . . public procedure KeyUp(var Key: Word; Shift :TShiftState); end; procedure TAmountEdit.KeyUp(var Key: Word; Shift :TShiftState); begin inherited; if Text='' then Free; // after calling free, an exception arises end; How should do to achieve the same effect? Thanx

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  • polymorphism pass instantiated base to deriver

    - by Eric
    I was wondering how to do this, consider the following classes public class Fruit { public string Name { get; set; } public Color Color { get; set; } } public class Apple : Fruit { public Apple() { } } How can I instantiate a new fruit but upcast to Apple, is there a way to instantiate a bunch of Fruit and make them apples with the name & color set. Do I need to manually deep copy? Of course this fails Fruit a = new Fruit(); a.Name = "FirstApple"; a.Color = Color.Red; Apple wa = a as Apple; System.Diagnostics.Debug.Print("Apple name: " + wa.Name); Do I need to pass in a Fruit to the AppleCTor and manually set the name and color( or 1-n properties) Is there an better design to do this?

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  • Comparing large strings in JavaScript with a hash

    - by user4815162342
    I have a form with a textarea that can contain large amounts of content (say, articles for a blog) edited using one of a number of third party rich text editors. I'm trying to implement something like an autosave feature, which should submit the content through ajax if it's changed. However, I have to work around the fact that some of the editors I have as options don't support an "isdirty" flag, or an "onchange" event which I can use to see if the content has changed since the last save. So, as a workaround, what I'd like to do is keep a copy of the content in a variable (let's call it lastSaveContent), as of the last save, and compare it with the current text when the "autosave" function fires (on a timer) to see if it's different. However, I'm worried about how much memory that could take up with very large documents. Would it be more efficient to store some sort of hash in the lastSaveContent variable, instead of the entire string, and then compare the hash values? If so, can you recommend a good javascript library/jquery plugin that implements an appropriate hash for this requirement?

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  • Explaining the need to avoid horizontal scroll

    - by Bradley Herman
    I need help explaining to my boss why her design is poor on a client's website. She has no knowledge of the web, and it can be difficult as a web developer working with a woman who is a graphic designer (not even a web designer really). On a current site she has designed, an image bar "needs" to be ~1200px according to her, though it isn't necessary with the content. A quick sketch to illustrate what's going on: As you see, the banner spills out past the 960px of the content and as wide as 1200px. This creates a horizontal scroll when all the content is viewable within the 960px wide viewport. I need to make this an <img and not a CSS background because it's a jQuery slideshow that fades from image to image. I think this is a big problem because a lot of people are going to get a horizontal scroll bar imposed in their browser when they're still able to see all the relevant content. She thinks no one will notice and it'll be fine; I think it's very bad practice and confusing to the end user. How do I explain the problem to her?

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  • How are a session identifiers generated?

    - by Asaf R
    Most web applications depend on some kind of session with the user (for instance, to retain login status). The session id is kept as a cookie in the user's browser and sent with every request. To make it hard to guess the next user's session these session-ids need to be sparse and somewhat random. The also have to be unique. The question is - how to efficiently generate session ids that are sparse and unique? This question has a good answer for unique random numbers, but it seems not scalable for a large range of numbers, simply because the array will end up taking a lot of memory.

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  • Python: HTTP Post a large file with streaming

    - by Daniel Von Fange
    I'm uploading potentially large files to a web server. Currently I'm doing this: import urllib2 f = open('somelargefile.zip','rb') request = urllib2.Request(url,f.read()) request.add_header("Content-Type", "application/zip") response = urllib2.urlopen(request) However, this reads the entire file's contents into memory before posting it. How can I have it stream the file to the server?

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  • How can I allow anonymous access to OTRS FAQ area?

    - by robbie
    I have been searching for this for quite some time now. I am using OTRS 2.4.7 and installed the FAQ package version 1.6.5. Everything seems to work fine. When I am logged in, I can create articles and other users have the ability to browse the articles. I want to be able to allow access to any anonymous non-user to be able to read these articles. Can anyone shed some light on how to allow this type of access? Thanks

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  • how can I unload a swf with AS3?

    - by Ole Media
    Any body can help on how I can do to unload a swf before I load the next one? var mLoader:Loader = new Loader(); function loadSWF(e:Event):void { var imageId:Array = e.target.name.split("_"); var targetId:int = imageId[0]; var caption:int = imageId[1]; txt = arrayText[caption]; dynText1.text = ""; dynText1.text = arrayText[caption]; dynText1.setTextFormat(textFormatMain); var swf:String = "swf/" + xmlList[targetId].image[caption].@swf; if (mLoader.content != null) { swfLoad.swfArea.mLoader.unload(); swfLoad.swfArea.mLoader.load(null); } mLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, onCompleteHandler); mLoader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, onProgressHandler); mLoader.load(new URLRequest(swf)); } //-------------------------------------------------------------------------// function onCompleteHandler(loadEvent:Event):void { swfLoad.swfArea.addChild(loadEvent.currentTarget.content); TweenLite.to(swfLoad, 0.5, {alpha:1}); } function onProgressHandler(mProgress:ProgressEvent):void { //var percent:Number = mProgress.bytesLoaded/mProgress.bytesTotal; //trace(percent); }

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  • Greek characters, Regular Expressions, and C#

    - by craigmoliver
    I'm building a CMS for a scientific journal and that uses a lot of Greek characters. I need to validate a field to include a specific character set and Greek characters. Here's what I have now: [^a-zA-Z0-9-()/\s] How do I get this to include Greek characters in addition to alphanumeric, '(', ')', '-', and '_'? I'm using C#, by the way.

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  • Form repeats values

    - by Tunji Gbadamosi
    I have a dynamically generated form to accept guest details and store the results into the a session array. However, when I retrieve the details, I keep finding that the last two guest details are always the same even though different inputs were given. Here's my form for getting the values (guests.php): <?php session_start(); require_once 'FormDB.php'; include 'connect.php'; include 'guests_.php'; ?> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Enter guest details</title> <script language="JavaScript" type="text/javascript" src="validation_functions.js"></script> </head> <body> <?php if($_SESSION['logged_in']){ //print '<script type="text/javascript">'; //print 'alert("You have successfully logged in '. $_SESSION['volunteer']['first_name'].'")'; //print '</script>'; $first_name="first_name"; $surname="surname"; $sex="sex"; $age = "age"; echo $error; //echo '<form name="choose" action="tables.php" method="post" onsubmit="return validate_guests(this);">'; echo '<form name="choose" action="guests.php" method="post" onsubmit="return validate_guests(this);">'; echo '<input type="hidden" name="hidden_value" value="'.$_SESSION['no_guests'].'" />'; if($_SESSION['no_guests'] >= 1){ echo '<table border="1">'; echo '<th>First Name</th>'; echo '<th>Surname</th>'; echo '<th>Day of Birth</th>'; echo '<th>Month of Birth</th>'; echo '<th>Year of Birth</th>'; echo '<th>Sex</th>'; //echo '<div id="volunteer">'; echo '<tr>'; echo '<td>'; echo $_SESSION['volunteer']['first_name']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['surname']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['dob_day']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['dob_month']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['dob_year']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['sex']; echo '</td>'; echo '</tr>'; //echo '</div>'; for($i=0;$i<$_SESSION['no_guests'];$i++){ //$guest = "guest_".$i; //echo '<div class="'.$guest.'">'; echo '<tr>'; echo '<td>'; echo '<input type="text" name="guest['.$i.']['.$first_name.']" id="fn'.$i.'">'; echo '</td>'; echo '<td>'; echo '<input type="text" name="guest['.$i.']['.$surname.']" id="surname'.$i.'">'; echo '</td>'; echo '<td>'; echo '<select name="guest['.$i.'][dob_day]" id="dob_day'.$i.'">'; for($j=1;$j<32;$j++){ echo"<option value='$j'>$j</option>"; } echo '</select>'; echo '</td>'; echo '<td>'; echo '<select name="guest['.$i.'][dob_month] id="dob_month'.$i.'">'; for($j=0;$j<sizeof($month);$j++){ $value = ($j + 1); echo"<option value='$value'>$month[$j]</option>"; } echo '</select>'; echo '</td>'; echo '<td>'; echo '<select name="guest['.$i.'][dob_year] id="dob_year'.$i.'">'; for($j=1900;$j<$year_limit;$j++){ echo"<option value='$j'>$j</option>"; } echo '</select>'; echo '</td>'; echo '<td>'; echo '<select name="guest['.$i.']['.$sex.']" id="sex'.$i.'">'; echo '<option>Female</option>'; echo '<option>Male</option>'; echo '</select>'; echo '</td>'; echo '</tr>'; //echo '</div>'; } echo '</table>'; } else{ echo '<table border="1">'; echo '<th>First Name</th>'; echo '<th>Surname</th>'; echo '<th>Day of Birth</th>'; echo '<th>Month of Birth</th>'; echo '<th>Year of Birth</th>'; echo '<th>Sex</th>'; echo '<th>Table</th>'; echo '<th>Seat</th>'; echo '<th>Menu</th>'; //echo '<div id="volunteer">'; echo '<tr>'; echo '<td>'; echo $_SESSION['volunteer']['first_name']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['surname']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['dob_day']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['dob_month']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['dob_year']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['sex']; echo '</td>'; echo '</tr>'; //echo '</div>'; } echo '</table>'; echo '<input type="submit" value="Submit">'; echo '</form>'; } else{ print '<script type="text/javascript">'; print 'alert("You have not successfully logged in '. $_SESSION['volunteer']['first_name'].'")'; print '</script>'; } ?> </body> Here's my code for processing the details (guests_.php): <?php $error = ""; if($_POST){ //$guests = array(); $guests = isset($_POST['guest']) ? $_POST['guest'] : null; if($guests){ foreach($guests as &$guest){ $guest['first_name'] = ucwords(strip_tags($guest['first_name'])); $guest['surname'] = ucwords(strip_tags($guest['surname'])); $guest['dob_day'] = ucwords(strip_tags($guest['dob_day'])); $guest['dob_month'] = ucwords(strip_tags($guest['dob_month'])); $guest['dob_year'] = ucwords(strip_tags($guest['dob_year'])); $guest['sex'] = ucwords(strip_tags($guest['sex'])); } } foreach($guests as $guest){ $date = $form->create_date($guest['dob_day'], $guest['dob_month'], $guest['dob_year']); $exist = $form->user_exists($guest['first_name'], $guest['surname'], $date, $guest['sex']); if($exist != ""){ $error .= $exist; } } if($error == ""){ //$_SESSION['existent_guests'] = FALSE; $_SESSION['guests'] = $guests; $form->set_guests($_SESSION['guests']); //$form->set_volunteer($_SESSION['volunteer']); header("location: tables.php"); exit(); } } ?>

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  • ChaiScript troubles

    - by Ockonal
    Hello guys, I'm using script language ChaiScript with c++ and Qt. I've defined such function: void ChaiPainter::drawRectangle(QPainter *painter, int x, int y, int height, int width) { painter.drawRect(x, y, width, height); } And in application paint-event: void MainWindow::paintEvent(QPaintEvent *event) { QPainter painter(this); chaiPainter->mChai.add(chaiscript::var(&painter), "painter"); chaiPainter->mChai.add(chaiscript::fun(&ChaiPainter::drawRectangle), "drawRect"); chaiPainter->mChai("drawRect(painter, 5, 5, 100, 100)"); } The error is: 'chaiscript::Eval_Error' what(): Error: "No matching function to dispatch to with function 'drawRect'" during evaluation at (1, 1) What I do wrong?

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  • Trouble displaying an object in WPF

    - by Scott
    I'm so new to this that I can't even phrase the question right... Anyway, I'm trying to do something very simple and have been unable to figure it out. I have the following class: public class Day : Control, INotifyPropertyChanged { public static readonly DependencyProperty DateProperty = DependencyProperty.Register("Date", typeof(int), typeof(Day)); public int Date { get { return (int)GetValue(DateProperty); } set { SetValue(DateProperty, value); if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs("Date")); } } } public static readonly DependencyProperty DayNameProperty = DependencyProperty.Register("DayName", typeof(String), typeof(Day)); public String DayName { get { return (String)GetValue(DayNameProperty); } set { SetValue(DayNameProperty, value); if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs("DayName")); } } } static Day() { DefaultStyleKeyProperty.OverrideMetadata(typeof(Day), new FrameworkPropertyMetadata(typeof(Day))); } #region INotifyPropertyChanged Members public event PropertyChangedEventHandler PropertyChanged; #endregion } I've learned that you can't call a constructor that has parameters in XAML so the only way to actually set some data for this class is through the two properties, DayName and Date. I created a ControlTemplate for Day which is as follows: <Style TargetType="{x:Type con:Day}"> <Setter Property="MinHeight" Value="20"/> <Setter Property="MinWidth" Value="80"/> <Setter Property="Height" Value="20"/> <Setter Property="Width" Value="80"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type con:Day}"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition/> <ColumnDefinition/> </Grid.ColumnDefinitions> <Rectangle Grid.ColumnSpan="2" x:Name="rectHasEntry" Fill="WhiteSmoke"/> <TextBlock Grid.Column="0" x:Name="textBlockDayName" Text="{TemplateBinding DayName}" FontFamily="Junction" FontSize="11" Background="Transparent" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,2,0,0"/> <TextBlock Grid.Column="1" x:Name="textBlockDate" Text="{TemplateBinding Date}" FontFamily="Junction" FontSize="11" Background="Transparent" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,2,0,0"/> <Rectangle Grid.ColumnSpan="2" x:Name="rectMouseOver" Fill="#A2C0DA" Opacity="0" Style="{StaticResource DayRectangleMouseOverStyle}"/> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> I then render it on screen in my MainWindow thusly: <Window x:Class="WPFControlLibrary.TestHarness.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:con="clr-namespace:WPFControlLibrary.Calendar;assembly=WPFControlLibrary" Title="MainWindow" Height="500" Width="525" WindowStartupLocation="CenterScreen"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="*"/> <ColumnDefinition Width="80"/> </Grid.ColumnDefinitions> <con:Day Grid.Column="1" Height="20" Width="80" DayName="Mon" Date="1"/> </Grid> And what I actually see is, well, nothing. If I put my cursor on the con:Day line of the XAML it'll highlight the correctly sized rectangle in the window but I don't see "Mon" on the left side of the rectangle and "1" on the right. What am I doing wrong? I suspect it's something simple but I'll be darned if I'm seeing it. My ultimate goal is to group a bunch of the Day controls within a Month control, which is then contained in a Year control as I'm trying to make a long Calendar Bar that lets you navigate through the months and years, while clicking on a Day would display any information saved on that date. But I can't even get the Day part to display independent of anything else so I'm a long way from the rest of the functionality. Any help would be greatly appreciated.

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  • The extern alias 'xxx' was not specified in a /reference option

    - by Brian Ensink
    I have two assemblies that unfortunately define the same type in the same namespace. I'm trying to use a an extern alias to work around the problem. In the Visual Studio IDE I have set the "Aliases" property of the reference to my alias. This is supposed to change the C# compiler command line to be something like this: /reference:MyAlias=MyAssembly.dll But it doesn't actually do that. The Visual Studio IDE seems to just ignore the Aliases property setting on the reference. So when I go and add the line extern alias MyAlias; at the top of my C# code file I get the error that the alias was not specified in a /reference option to the compiler. I can't figure out what I am doing wrong. Any ideas?

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  • How to manage processes-to-CPU cores affinities ?

    - by Philippe
    I use a distributed user-space filesystem (GlusterFS) and I would like to be sure GlusterFS processes will always have the computing power they need. Each execution node of my grid have 2 CPU, with 4 cores per CPU and 2 threads per core (16 "processors" are seen by Linux). My goal is to guarantee that GlusterFS processes have enough processing power to be reliable, responsive and fast. (There is no marketing here, just the dreams of a sysadmin ;-) I consider two main points : GlusterFS processes I/O for data access (on local disks, or remote disks) I thought about binding the Linux Kernel and GlusterFS instances on a specific "processor". I would like to be sure that : No grid job will impact the kernel and the GlusterFS instances Researchers jobs won't be affected by system processes (I'd like to reserve a pool of cores to job execution and be sure that no system process will use these CPUs) But what about I/O ? As we handle a huge amount of data (several terabytes), we'll have a lot of interuptions. How can I distribute these operations on my processors ? What are the "best practices" ? Thanks for your comments!

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