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  • Empty list in appengine datastore: java vs python

    - by lOranger
    I have the following java model class in AppEngine: public class Xyz ... { @Persistent private Set<Long> uvw; } When saving an object Xyz with an empty set uvw in Java, I get a "null" field (as listed in the appengine datastore viewer). When I try to load the same object in python (through remote_api), as defined by the following python model class: class Xys(db.Model): uvw = db.ListProperty(int) I get a "BadValueError: Property uvw is required". When saving another object of the same class in python with an empty uvw list, the datastore viewer print a "missing" field. Apparently empty lists storage handling differs between Java and python and lead to "incompatible" objects. Thus my question: Is there a way to, either: force Java to store an empty list as a "missing" field, force Python to gracefully accept a "null" list as an empty list when loading the object? Or any other suggestion on how to handle empty list field in both languages. Thanks for your answers!

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  • Best jQuery/Prototype book for complex ajax?

    - by Burton Kent
    I've been working on a complex app with one main dashboard. I don't particularly like the design because it tries to do too much on one page. So the lead developer thought it would be a good idea to use ajax - because the page is so big. Refreshing part of it is far faster than loading it again. Problem is there's several ways data can be used. Adding items Editing rows Performing actions on selected rows (selected using a checkbox) Changing single items (like location, phone) My problem is making GENERALIZABLE ajax code that can operate on the data in a div, using class names to assemble the proper information for the ajax call. I did pretty well, but can't help but want to see if there's a better way to do it.

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  • Frame.Navigate to an embedded resource F#

    - by akaphenom
    I have a 100% silverlight 3.0 / f# 2.0 application I am wrapping my brain around. I have the base application loading correctly - and now I want to add the naigation controls to it. My page is stored as an embedded resource - but the Frame.Navigate takes a URI. I know what I have is wrong but here it is: let nav : Frame = mainGrid ? mainFrame let url = "/page1.xaml" let uri = new System.Uri(url, System.UriKind.Relative) ; nav.Navigate uri Any thoughts?

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  • Automatically release resources RAII-style in Perl

    - by Philip Potter
    Say I have a resource (e.g. a filehandle or network socket) which has to be freed: open my $fh, "<", "filename" or die "Couldn't open filename: $!"; process($fh); close $fh or die "Couldn't close filename: $!"; Suppose that process might die. Then the code block exits early, and $fh doesn't get closed. I could explicitly check for errors: open my $fh, "<", "filename" or die "Couldn't open filename: $!"; eval {process($fh)}; my $saved_error = $@; close $fh or die "Couldn't close filename: $!"; die $saved_error if $saved_error; but this kind of code is notoriously difficult to get right, and only gets more complicated when you add more resources. In C++ I would use RAII to create an object which owns the resource, and whose destructor would free it. That way, I don't have to remember to free the resource, and resource cleanup happens correctly as soon as the RAII object goes out of scope - even if an exception is thrown. Unfortunately in Perl a DESTROY method is unsuitable for this purpose as there are no guarantees for when it will be called. Is there a Perlish way to ensure resources are automatically freed like this even in the presence of exceptions? Or is explicit error checking the only option?

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  • In Haskell, will calling length on a Lazy ByteString force the entire string into memory?

    - by me2
    I am reading a large data stream using lazy bytestrings, and want to know if at least X more bytes is available while parsing it. That is, I want to know if the bytestring is at least X bytes long. Will calling length on it result in the entire stream getting loaded, hence defeating the purpose of using the lazy bytestring? If yes, then the followup would be: How to tell if it has at least X bytes without loading the entire stream? EDIT: Originally I asked in the context of reading files but understand that there are better ways to determine filesize. Te ultimate solution I need however should not depend on the lazy bytestring source.

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  • Blog Engine .NET with XML Data Storage How is it so fast ?

    - by Kubi
    I am looking for a way to embed a blog engine into my own application and I am too curious about Blog Engine algorithm. This may not be the correct place to ask but, How is that possible to store blog entry data in an XML file like BlogEngine.Net with Default Configuration. It must be getting slower everyday while the file is getting larger and larger. I am wondering the algorithm behind that. Is it loading with a different way ? Or Am I wrong with the time estimation ? I know it is open source but I thought it would be better to see a discussion here for some others might be thinking the same and this thread can be a reference.

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  • PostGIS - can't create spatially-enabled database

    - by itgorilla
    I'm using Ubuntu 10.10, PostgreSQL 9.0 and PostGIS 1.5. I've installed PostGIS 1.5 from: https://launchpad.net/~ubuntugis/+archive/ubuntugis-unstable I used PPA first then the command: sudo apt-get install postgis to install postgis. I've been following these instructions to create a spatially-enabled database: http://ostgis.refractions.net/docs/ch02.html#id2630100 I got to the point where it's saying: Now load the PostGIS object and function definitions into your database by loading the postgis.sql definitions file (located in [prefix]/share/contrib as specified during the configuration step). psql -d [yourdatabase] -f postgis.sql Well, there is no postgis.sql on my server after the installation. I did an sudo updatedb to make sure I can find postgis.sql but it's not there. Any ideas? Thank you!

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  • Limited IList<> implementation ?

    - by Wam
    Hello people, I'm doing some work with stats, and want to refactor the following method : public static blah(float[] array) { //Do something over array, sum it for example. } However, instead of using float[] I'd like to be using some kind of indexed enumerable (to use dynamic loading from disk for very large arrays for example). I had created a simple interface, and wanted to use it. public interface IArray<T> : IEnumerable<T> { T this[int j] { get; set; } int Length { get; } } My problem is : float[] only inherits IList, not IArray, and AFAIK there's no way to change that. I'd like to ditch IArray and only use IList, but my classes would need to implement many methods like Add, RemoveAt although they are fixed size And then my question : how can float[] implement IList whereas it doesn't have these methods ? Any help is welcome. Cheers

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  • get the expanding node in a treeview

    - by Iulian
    I have a treeview control that functions like a folder browser. Because loading the entire folder structer from disk is taking a lot of time i'm trying to load only one level at a time. So i have a function that adds nodes for all the folders in the current node. I thought that the best method would be to run it on the BeforeExpand event of the treeview. UpdateTreeView(TreeView.SelectedNode); is not working because clicking the + sign to expand is not selecting the node also. So how to find the node that is expanding.

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  • HTTP redirect fallback

    - by Ondrej Stastny
    Hi, Is there a way to provide fallback URL when HTTP redirect times out? What I'm trying to achieve is that when I hit the original url, I would respond with HTTP redirect (300, 307?) giving the browser new URL and the fallback URL in case the new URL times out? I was also considering doing this client side but it just does not seem to be very effective (in terms of speed, client support). What I would do is probably have a tiny 1x1px image on each server, try loading it and then check with javascript which server is up and redirect there. Any other ideas? Thanks

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  • how to remove dynamically loaded images in javascript

    - by jesse
    I'm loading in 3 images (named 1.jpg, 2.jpg, 3jpg) dynamically to 3 divs called "div1", "div2" and "div3". function loadImages() { for (var i = 1; i < 3; i++ ) { var img = document.createElement("img"); img.src = "vegetables/"+i+".jpg"; img.id = "a"+i+""; var divName = "div"+i+""; document.getElementById(divName).appendChild(img); } } That works, but the removing part I can't seem to get to work.. function removeImages() { for (var i = 1; i < 3; i++ ) { var oldImages = "a"+i+""; var divName = "div"+i+""; document.getElementById(divName).removeChild(oldImages); } } Thank you.

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  • Jquery qtip ajax issue

    - by user272899
    Hi All, I am trying to post the value of an input box (In this case a imdb link) to my imdbgrabber.php page and have it return the info of that movie into a qtip box. Everything works fine until i try and post the variable to the imdbgrabber page. This is the code. Javascript: var link = $("#link").val(); var imdbLink = 'link='+ link; $(".moviebox").qtip({ style: { name: 'cream' }, content: { method: 'GET', data: imdbLink, url: '/includes/imdbgrabber.php', text: '<img class="throbber" src="/images/loading.gif" alt="Loading..." />' }, position: { corner: { target: 'bottomright', tooltip: 'bottomleft' } } }); HTML: <!--start moviebox--> <div class="moviebox"> <a href="#"> <img src="http://1.bp.blogspot.com/_mySxtRcQIag/S6deHcoChaI/AAAAAAAAObc/Z1Xg3aB_wkU/s200/rising_sun.jpg" /> <form method="get" action=""> <input type="text" name="link" id="link" style="display:none" value="http://www.imdb.com/title/tt0367882"/> </form> </a> </div> <!--end moviebox--> and finally the php: <?php $url=$_GET['link']; //$url = 'http://www.imdb.com/title/tt0367882/'; //get the page content $imdb_content = get_data($url); //parse for product name $name = get_match('/<title>(.*)<\/title>/isU',$imdb_content); $director = strip_tags(get_match('/<h5[^>]*>Director:<\/h5>(.*)<\/div>/isU',$imdb_content)); $plot = get_match('/<h5[^>]*>Plot:<\/h5>(.*)<\/div>/isU',$imdb_content); $release_date = get_match('/<h5[^>]*>Release Date:<\/h5>(.*)<\/div>/isU',$imdb_content); $mpaa = get_match('/<a href="\/mpaa">MPAA<\/a>:<\/h5>(.*)<\/div>/isU',$imdb_content); $run_time = get_match('/Runtime:<\/h5>(.*)<\/div>/isU',$imdb_content); $rating = get_match('/<div class="starbar-meta">(.*)<\/div>/isU',$imdb_content); ////build content //$content = '<h2>Film</h2><p>'.$name.'</p>' // . '<h2>Director</h2><p>'.$director.'</p>' // . '<h2>Plot</h2><p>'.substr($plot,0,strpos($plot,'<a')).'</p>' // . '<h2>Release Date</h2><p>'.substr($release_date,0,strpos($release_date,'<a')).'</p>' // . '<h2>MPAA</h2><p>'.$mpaa.'</p>' // . '<h2>Run Time</h2><p>'.$run_time.'</p>' // . '<h2>Full Details</h2><p><a href="'.$url.'" rel="nofollow">'.$url.'</a></p>'; //gets the match content function get_match($regex,$content) { preg_match($regex,$content,$matches); return $matches[1]; } //gets the data from a URL function get_data($url) { $ch = curl_init(); $timeout = 5; curl_setopt($ch,CURLOPT_URL,$url); curl_setopt($ch,CURLOPT_RETURNTRANSFER,1); curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout); $data = curl_exec($ch); curl_close($ch); return $data; } ?> <!--start infobox--> <div class="info"> <span> <?php echo '<strong>'.$name.'</strong>' ?> </span> <img src="http://1.bp.blogspot.com/_mySxtRcQIag/S6deHcoChaI/AAAAAAAAObc/Z1Xg3aB_wkU/s200/rising_sun.jpg" /> <div class="plot"> <?php echo ''.substr($plot,0,strpos($plot,'<a')).'</div>' ?> </div> <div class="runtime"> <?php echo'<strong>Run Time</strong><br />'.$run_time.'</div>' ?> </div> <div class="releasedate"> <?php echo '<strong>Release Date</strong><br />'.substr($release_date,0,strpos($release_date,'<a')).'</div>' ?> </div> <div class="director"> <?php echo '<strong>Director</strong><br />'.$director.'' ?> </div> <div class="rating"> <?php echo '<strong>Rating</strong><br />'.$rating.'' ?> </div> </div> <!--end infobox--> I am sure it is a simple mistake somewhere but after hours of looking i thought i would ask the experts.

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  • Why in landscape orientation in simulator all the subviews appear out of order?

    - by wolverine
    I was doing a sample app in ipad. I added about 4 to 5 imageviews to the left side of the view vertically. This view will appear when we select the corresponding entry in the splitviewcontroller. In ipad simulator too, all the images were loading and all are working fine in portrait orientation. But when I rotate the simulator to landscape orientation, these imageviews doesnt appear where i placed them. Some of them overlapping each other, some have half of their part in the navigation bar and all. Has gone completely out of order. I am confused why is all this happening. Can anyone help me solve this issue?

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  • How to get the Focus on one of Buttons of JQuery Dialog on ASP.NET MVC page?

    - by Rita
    Hi I have an ASP.NET MVC page(Registration). On loading the page, i am calling Jquery Dialog with Agree and Disagree buttons on that Dialog. 1). How to set the focus to Agree button by default? 2). How to disable the X (Close) Mark that is on Top right corner? (So that i don't want the user to close that dialog simply). Code: $("#dialog-confirm").dialog({ closeOnEscape: false, autoOpen: <%= ViewData["autoOpen"] %>, height: 400, width: 550, modal: true, buttons: { 'Disagree': function() { location.href = "/"; }, 'Agree': function() { $(this).dialog('close'); $(this).focus(); } }, beforeclose: function(event, ui) { var i = event.target.id; var j = 0; } }); Appreciate your responses. Thanks

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  • Choosing random action, Flash AS3

    - by esryl
    I have 2 actions in a Flash file that I would like to test for conversion. One is opening a link in a tab/window, the other loading the content in a Colorbox iframe over the page. How do I randomly choose one of the following actions? I currently listen for a click on a button: clickJoin.addEventListener(MouseEvent.CLICK,toJoin); My two actions are: navigateToURL(new URLRequest("http://www.google.com/"), '_blank'); and ExternalInterface.call('$.fn.colorbox({ href: "http://www.google.com/", width:"80%", height:"80%", iframe:true, onLoad:function(){ $("#player").css({"visibility":"hidden"}); }, onClosed:function(){ $("#player").css({"visibility":"visible"}); }}) ');

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  • Java File and ByteArray or InputStream - please quick help

    - by Peter Perhác
    I want to use jFuge to play some MIDI music in an applet. There's a class for the MIDI pattern - Pattern - and the only method to load the pattern is from a File. Now, I don't know how applets load files and what not, but I am using a framework (PulpCore) that makes loading assets a simple task. If I need to grab an asset from a ZIP catalogue, I can use the Assets class which provides get() and getAsStream() methods. get() returns the given asset as a ByteArray, the other as an InputStream. I need jFuge to load the pattern from either ByteArray or InputStream. In pseudo-code, I would like to do this: Pattern.load(new File(Assets.get("mymidifile.midi"))); however there is no File constructor that would take a ByteArray. Suggestions, please?

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  • IE7 Animated GIF Appears as a Static Image?

    - by Abs
    Hello all, After a button is clicked to start a process on my web app, I show a small loading gif (animated) that rotates to indicate to the user something is happening. I put the gif img in place of the button like this using JQuery: $('#btn_holder').html('<img src="images/loading2.gif" style="margin-left:40px; margin-top:7px;" />'); This works great in all browsers (Firefox, IE8, Chrome) except IE7 on a windows server 2003. In IE, the gif appears but it is not animated. What's going on with IE7? How can I test what the problem is? Thanks all

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  • Preload a lot of tiny pics

    - by clorz
    I'm thinking about how to approach the problem at hand. There's a flash movie that requires a lot of relativly small images and I'm trying to optimize the time it takes for them to be preloaded. One thing I've considered it turning on KeepAlive in Apache on the server side. That works. But my mind still wonders if there's anything else ;-) So, what other approaches I may try? Is there a way to compress all those images and then unpack on client side? I have full control on both server and client side. Can even try installing something other than Apache. Cache is not an option because it already works and it's first time loading that bothers me here.

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  • Correct way to trigger object clone/memento when property changes

    - by Jay
    Hi, I have a big doubt about the correct way to save an object state (clone object), if necessary to rollback the changes, when a property has changed. I know that the IEditableObject interface exists for those cases but during some tests the BeginEdit would just fire like crazy (I have a DataGrid whose values can be edited but I won't need to keep the state of the object in these cases). I'm following the MVP design pattern in my project and the view's DataContext is a wrapper of my presenter.Let's say I have a CheckBox/TextBox in my UI and when that textbox's value changes, the property bound in the wrapper gets set.Currently, before setting the new value i'm raising an event to the presenter (something like PropertyChanging) that clones my wrapper. I'm doing this because I don't think that job should be done by the wrapper itself but by the presenter.Is this a correct approach? Raising the event is an acceptable solution? I thought of other possible ideas: Interface between presenter and wrapper; Use explicit binding and trigger the binding after saving object's state; What is your opinion about the best way to do this? Should I just keep IEditableObject, is this the best way? Best Regards

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  • What is the rationale to non allow overloading of C++ conversions operator with non-member functio

    - by Vicente Botet Escriba
    C++0x has added explicit conversion operators, but they must always be defined as members of the Source class. The same applies to the assignment operator, it must be defined on the Target class. When the Source and Target classes of the needed conversion are independent of each other, neither the Source can define a conversion operator, neither the Target can define a constructor from a Source. Usually we get it by defining a specific function such as Target ConvertToTarget(Source& v); If C++0x allowed to overload conversion operator by non member functions we could for example define the conversion implicitly or explicitly between unrelated types. template < typename To, typename From operator To(const From& val); For example we could specialize the conversion from chrono::time_point to posix_time::ptime as follows template < class Clock, class Duration operator boost::posix_time::ptime( const boost::chrono::time_point& from) { using namespace boost; typedef chrono::time_point time_point_t; typedef chrono::nanoseconds duration_t; typedef duration_t::rep rep_t; rep_t d = chrono::duration_cast( from.time_since_epoch()).count(); rep_t sec = d/1000000000; rep_t nsec = d%1000000000; return posix_time::from_time_t(0)+ posix_time::seconds(static_cast(sec))+ posix_time::nanoseconds(nsec); } And use the conversion as any other conversion. So the question is: What is the rationale to non allow overloading of C++ conversions operator with non-member functions?

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  • Django syncdb not making tables for my app

    - by Rosarch
    It used to work, and now it doesn't. python manage.py syncdb no longer makes tables for my app. From settings.py: INSTALLED_APPS = ( 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.sites', 'mysite.myapp', 'django.contrib.admin', ) What could I be doing wrong? The break appeared to coincide with editing this model in models.py, but that could be total coincidence. I commented out the lines I changed, and it still doesn't work. class MyUser(models.Model): user = models.ForeignKey(User, unique=True) takingReqSets = models.ManyToManyField(RequirementSet, blank=True) takingTerms = models.ManyToManyField(Term, blank=True) takingCourses = models.ManyToManyField(Course, through=TakingCourse, blank=True) school = models.ForeignKey(School) # minCreditsPerTerm = models.IntegerField(blank=True) # maxCreditsPerTerm = models.IntegerField(blank=True) # optimalCreditsPerTerm = models.IntegerField(blank=True) UPDATE: When I run python manage.py loadddata initial_data, it gives an error: DeserializationError: Invalid model identifier: myapp.SomeModel Loading this data had worked fine before. This error is thrown on the very first data object in the data file.

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  • How to get the playing file total time duration Media player

    - by Geetha
    Hi All, I use media player control to play mp3 files in asp.net application. I want to find When the playing process gets end and the total time require to finish the file using javascript. Code: <object id="mediaPlayer" classid="clsid:22D6F312-B0F6-11D0-94AB-0080C74C7E95" codebase="http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#Version=5,1,52,701" height="1" standby="Loading Microsoft Windows Media Player components..." type="application/x-oleobject" width="1"> <param name="fileName" value="" /> <param name="animationatStart" value="true" /> <param name="transparentatStart" value="true" /> <param name="autoStart" value="true" /> <param name="showControls" value="true" /> <param name="volume" value="100" /> <param name="loop" value="true" /> </object> Geetha.

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  • JAAS and WebLogic 10.3: Granting specific codebase permissions to a JAR bundled within an EAR

    - by Jason
    Here's my scenario: I have a JAR within the APP-INF/lib of my EAR, to be deployed within WebLogic 10g Release 3 against which I wish to grant specific permissions. e.g., grant codebase "file:/c:/somedir/my.jar" { permission java.net.SocketPermission "*:-","accept,connect,listen, resolve"; permission java.net.SocketPermission "localhost:-","accept,connect,listen,resolve"; permission java.net.SocketPermission "127.0.0.1:-","accept,connect,listen,resolve"; permission java.net.SocketPermission "230.0.0.1:-","accept,connect,listen,resolve"; permission java.util.PropertyPermission "*", "read,write"; permission java.lang.RuntimePermission "*"; permission java.io.FilePermission "<<ALL FILES>>","read,write,delete"; permission javax.security.auth.AuthPermission "*"; permission java.security.SecurityPermission "*"; }; Questions: Where is the best place to define this grant - in the java.policy of the JRE, WL server's weblogic.policy, or within a XML packaged within the EAR How do I define the codebase URL to the JAR? The examples I have seen have an explicit reference to the JAR on the file system, however I am deploying the JAR packaged up within an EAR. Thanks!

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  • fb:request-form in iframe redirects away from facebook

    - by IkimashoZ
    I have an <fb:requestform> in an iFrame Facebook app. I have set target="_parent", so that the callback will target the parent iFrame and not itself, which seems to work as expected. But, instead of my desired file loading, I get redirected to my server. Checking the response of the requestform's POST in Firebug revealed this: <script type="text/javascript"> top.location.href = "http://www.facebook.com/login.php?api_key=***&v=1.0&req_perms=&next=http%3A%2F%2F***"; </script> I have already had this same problem when sending jQuery AJAX requests to update various elements in an iFrame. I solved the problem by making sure my headers contain P3P: CP="CAO PSA OUR". That is indeed set for this call as well (can be seen clearly in Firebug), but I still get redirected to facebook.com/login.php.

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  • iPhone – How to import/drawing UI graphic elements? CGContextDrawPDFPage?

    - by Ross
    Hello, What is the best way to use the custom UI graphics on the iPhone? I've come across CGContextDrawPDFPage and Panic's Shrinkit. Should I be using storing my vector ui graphics as PDF's and loading them using CGContextDrawPDFPage to draw them. I did previously asked what way Apple store their UI graphics and was answered crushed png. The options as I see it, but I would really want to know what technique other people use. This question is for vector graphics only. Looking for what is standard / most effective / most efficient. PNG (bitmapped image) Custom UIView drawing code (generated from Opacity) PDF (I've not used this method, is it with CGContextDrawPDFPage?) Many thanks Ross

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