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  • How to pass an event to a method and then subscribe to it?

    - by Ryan Peschel
    Event Handler public void DeliverEvent(object sender, EventArgs e) { } #1: This Works public void StartListening(Button source) { source.Click += DeliverEvent; } #2: And so does this.. public void StartListening(EventHandler eventHandler) { eventHandler += DeliverEvent; } But in #2, you cannot call the method because if you try something like this: StartListening(button.Click); You get this error: The event 'System.Windows.Forms.Control.Click' can only appear on the left hand side of += or -= Is there any way around that error? I want to be able to pass the event and not the object housing the event to the StartListening method.

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  • How can I dynamically inject code into event handlers in Delphi?

    - by mjustin
    For debugging / performance tests I would like to dynamically add logging code to all event handlers of components of a given type. For example, for all Dataset components located ona TDatamodule, I would like to add some code for the BeforeOpen and the AfterOpen event to store the start and end time and send a line to a logger with the elapsed time in the AfterOpen event. I would prefer to do this dynamically (no component subclassing), so that I can add this to all existing datamodules and forms with minimal effort only when needed. Iterating all components and filtering by their type is easy, but for the components which already have event handlers assigned, I need a way to store the existing event handlers, and assign a new modified event handler which first does the logging and then will invoke the original code which was already present. Is there a design pattern which can be applied, or even some example code which shows how to implement this in Delphi?

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  • Dynamic filling WrapPanel buttons from DB, setting the event handlers

    - by Anry
    I have a table: I'm using NHibernate. The class of entity: public class PurchasedItem { public virtual int Id { get; set; } public virtual Product Product { get; set; } public virtual int SortSale { get; set; } } I want to get all the records table PurchasedItems (my method returns an IList ). Records are sorted in descending order (column SortSale). How to fill WrapPanel buttons from the list IList ? For each button assign the event handler. By pressing the button display a message with the name of the product.

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  • C#, WinForms: What would prevent KeyDown events from chaining up from focused control up to main For

    - by blak3r
    As i understand it, when a keyboard button is pressed it should invoke the KeyDown event for the control which has focus. Then, the KeyDown for the parent control, so on and so forth until it reaches main form. UNLESS - along the chain one of the EventHandlers did: e.SuppressKeyPress = true; e.Handled = true; In my case, KeyDown events never get to the main form. I have Form - Panel - button for example. Panel doesn't offer a KeyDown Event, but it shouldn't stop it from reaching the main form right? Right now as a work around I set every single control to call an event handler I wrote. I'm basically trying to prevent Alt-F4 from closing the application and instead minimize it.

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  • Debugging stack data not assigned to a named variable

    - by gibbss
    Is there a way to view stack elements like un-assigned return values or exceptions that not assigned to a local variable? (e.g. throw new ...) For example, suppose I have code along the lines of: public String foo(InputStream in) throws IOException { NastyObj obj = null; try { obj = new NastyObj(in); return (obj.read()); } finally { if (obj != null) obj.close(); } } Is there any way to view the return or exception value without stepping to a higher level frame where it is assigned? This is particularly relevant with exceptions because you often have to step back up through a number of frames to find an actual handler. I usually use the Eclipse debugging environment, but any answer is appreciated. Also, if this cannot be done, can you explain why? (JVM, JPDA limitation?)

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  • FF extension: displaying an array of string elements in a sidebar

    - by sujay-jain
    I am developing a ff extension which displays a list of elements from an array (dynamic) in the sidebar. The array is dynamic and needs to be constructed in a function everytime the sidebar is opened (or any other event handler). Later, i will need to implement link functionality on parts of the string. What is the best way to go about this? I have created an empty sidebar and just know the label element as of now. menu, and menuitem dont work. What other elements can i use to display text in a good way which supports dynamic contruction. Is there some good tutorial/sample extension which i can see and learn?

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  • iPhone Full and Lite version without StoreKit

    - by beryllium
    Hi there! I have a Full and Lite applications that were built from the same code. Lite version has a button Upgrade. What code I should place in button's handler for checking users payment and update application to Full version?? I know StoreKit framework that allow to unblock some features, but I need just 2 different applications. Maybe there is tutorial on this topic, but I found nothing. If anyone has reference link pls provide None of those applications has not yet uploaded to Appstore. Thanks.

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  • How do you refresh the contents of an R gWidget?

    - by Richie Cotton
    I'm creating a GUI in R using gWidgets (more specifically gWidgetstcltk). I'd like to know how to update the contents of selection-type widgets, such as gdroplist and gtable. I currently have a rather hackish method of deleting the widget and re-creating it. I'm sure there's a better way. This simple example displays all the variables in the global environment. library(gWidgets) library(gWidgetstcltk) create.widgets <- function() { grp <- ggroup(container = win) ddl <- gdroplist(ls(envir = globalenv()), container = grp) refresh <- gimage("refresh", dirname = "stock", container = grp, handler = function(h, ...) { if(exists("grp") && !is.null(grp)) { delete(win, grp) rm(grp) } grp <- create.widgets() } ) } win <- gwindow() grp <- create.widgets()

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  • Email notifications of exceptions happening in a Python app?

    - by ming yeow
    Hi folks, I want to set up email notifications when there is an error happening in my application. In ruby, there is a very elegant solution called ExceptionNotifier, which wraps around the exception handler and uses the built-in mailer to send an email. What is the best way of doing this in Python? I know that this is a very common issue, so would love for any tips that you folks can share! PS: Code samples, pointers to modules would be AWESOME! Thanks!

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  • Chaining jQuery animations using recursion crashes browser

    - by Rob Sobers
    Here's the basic idea of what I'm trying to do: Set the innerHTML of a DIV to some value X Animate the DIV When the animation finishes, change the value of X and repeat N times If I do this in a loop, what ends up happening is, because the animations occur asynchronously, the loop finishes and the DIV is set to its final value before the animations have had a chance to run for each value of X. As this question notes, the best way to solve this problem is to make a recursive call to the function in the callback handler for the animation. This way the value of the DIV doesn't change until the animation of the previous value is complete. This works perfectly...to a point. If I animate a bunch of these DIVs at the same time, my browser gets overwhelmed and crashes. Too much recursion. Can anyone think of a way to do this without using recursion?

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  • AudioRecord doesn't work for Motorola Milestone

    - by hcpl
    I'm having this problem only on Motorola Milestone. Code: // init recorder recordInstance = new AudioRecord(MediaRecorder.AudioSource.MIC, 8000, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, 8000); recordInstance.startRecording(); //more code here recordInstance.stop(); The errorinformation I have (can't find more for the moment since I don't have a milestone myself for debugging): Uncaught handler: thread main exiting due to uncaught exception java.lang.IllegalStateException: stop() called on an uninitialized AudioRecord. at android.media.AudioRecord.stop(AudioRecord.java:51 6) Apparantly I'm not the only one with this problem. Some very similar threads I found (without solution): http://groups.google.com/group/android-developers/browse_thread/thread/6dd24aeb484b2e40 http://androidcommunity.com/forums/f2/problem-using-audiorecord-in-motorola-milestone-30935/ http://community.developer.motorola.com/t5/Android-App-Development-for/Problem-using-AudioRecord-on-Milestone-device/m-p/3889 http://www.fring.com/forums/showthread.php?t=16194

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  • AJAX CascadingDropdown - Setting the selected index

    - by RPM1984
    I have a CascadingDropDown on an ASP.NET page. Now, the prompt text is "Select State". (list of states). However, on a different version of this page (ie querystring), i might want to set the selected index to "California" for example. How can i do this? The web service used by the ajax control (ie GetStates) gets invoked at the same time the jquery document.ready function is triggered (ie asynchronously). So when i try and set the selected index in jquery, the items are not yet bound. Is there a way to attach a handler to the ajax dropdown so that i can set the selected index once the webservice call has completed, and the items are bound?

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  • EventSetter - error XAML in Visual Studio designer

    - by pileggi
    Hi! I've done my TreeView all with XAML but now I'd like to manage an event with code-behind. The HierarchicalDataTemplate contains an Image. I need to capture the events MouseEnter / MouseLeave on the Image. I've tried in this way: <Image x:Name="imgArticolo" Source="{Binding imgArt}"> <Image.Style> <Style TargetType="{x:Type Image}"> <EventSetter Event="MouseEnter" Handler="iArt_MouseEnter"/> </Style> </Image.Style> </Image> But in the designer of Visual Studio appear the error: "Impossible to load a file XAML with EventSetter". How can I remedy? Thank you! Pileggi

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  • How do I exclude things that match the specified path for an HttpHandler in ASP.Net?

    - by Tim Goodman
    I know that if I want to have requests for MyPage.aspx go to the class called MyHandler in the assembly called MyAssembly, I can add this to my web.config file: <configuration> <system.web> <httpHandlers> <add verb="*" path="MyPage.aspx" type="MyHandler, MyAssembly"/> </system.web> </configuration> This works for any MyPage.aspx at the (made up) URL: www.mycoolsite.com/MyProject/[SomePathHere]/MyPage.aspx What if I want to do it for every MyPage.aspx except www.mycoolsite.com/MyProject/NoHandler/MyPage.aspx Is there a way to exclude that path from the handler?

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  • Google app engine error when I login.

    - by zjm1126
    i am using http://code.google.com/p/gaema/source/browse/#hg/demos/webapp, and this is my traceback: Traceback (most recent call last): File "D:\Program Files\Google\google_appengine\google\appengine\ext\webapp\__init__.py", line 510, in __call__ handler.get(*groups) File "D:\gaema\demos\webapp\main.py", line 31, in get google_auth.get_authenticated_user(self._on_auth) File "D:\gaema\demos\webapp\gaema\auth.py", line 641, in get_authenticated_user OpenIdMixin.get_authenticated_user(self, callback) File "D:\gaema\demos\webapp\gaema\auth.py", line 83, in get_authenticated_user url = self._OPENID_ENDPOINT + "?" + urllib.urlencode(args) File "D:\Python25\lib\urllib.py", line 1250, in urlencode v = quote_plus(str(v)) UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-1: ordinal not in range(128) how to do this thanks updated i change the code from args = dict((k, v[-1]) for k, v in self.request.arguments.iteritems()) args["openid.mode"] = u"check_authentication" url = self._OPENID_ENDPOINT + "?" + urllib.urlencode(args) to args = dict((k, v[-1].encode('utf-8')) for k, v in self.request.arguments.iteritems()) args["openid.mode"] = u"check_authentication" url = self._OPENID_ENDPOINT + "?" + urllib.urlencode(args) but also error.

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  • C# Event Handlers automatically created by WinForms Designer

    - by RHaguiuda
    Just moved from VB.NET to C#. In VB to connect and Event Handler to a Sub we use the Handles clause. From what it seems, this do not exist in C#. After creating a simple application with a button I realize that Window Forms Designer automatically created an EventHandler to my button1_Click function (after I double clicked it), in Form1.Designer.cs with this code: this.button1.Click += new System.EventHandler(this.button1_Click); But, in VB, the WinForms Designer create the Handles clause in my class, in the function header. So, C# create the default EventHandler in designer file, while VB creates in main class with control resides. Is this correct? Am I missing something here?

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  • HSQLDB and in-memory files

    - by lewap
    Is it possible to setup HSQLDB in a way, so that the files with the db information are written into memory instead of using actual files? I want to use hsqldb to export some data structures together with hibernate mappings. Is is, however, not possible to write temporary files, so that I need to generate the files in-memory and return a stream with their contents as a response. Setting hsqldb to use nio seems not to be a solution, because there is no way to get hold of those files before they get written onto the filesystem. What I'm thinking of is a protocol handler for hsqldb, but I didn't find a suitable solution yet. Just to describe in other words: A hack solution would be to pass hsqldb a stream or several streams. It would then during its operation write data into those streams. After all data is written, the user of the db could then use those streams to send it back over the network.

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  • when i click on checkbox ,the image should be hiden though i dont make it happen somehow and i can g

    - by user309381
    function Psend() { new Ajax.Request('Handler.ashx', { method: 'get', onSuccess: function(transport) { var response = transport.responseText || "no response text"; //alert("Success! \n\n" + response); var obj = response.evalJSON(true); for (i = 0; i < 4; i++) { DeCheBX = $('MyDiv').insert(new Element('input', { 'type': 'checkbox', 'id': "Img" + obj[i].Nam, 'value': obj[i].IM, 'onClick': 'SayHi(this,i)' })); document.body.appendChild(DeCheBX); DeImg = $('MyDiv').insert(new Element('img', { 'id': "img" + obj[i].Nam, 'src': obj[i].IM })); document.body.appendChild(DeImg); SayHi = function(x,i) { try { if ($(x).checked == true) { img = "img" + obj[i].Nam; alert(img); $('img').hide(); } } catch (e) { alert("error"); } }; } }, onFailure: function() { alert('Something went wrong...') } }); }

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  • clicking a button via javascript does not cause a post

    - by Andreas Niedermair
    hi there! <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.js"></script> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.2/jquery-ui.js"></script> </head> <body> <form id="fooForm"> <script type="text/javascript"> function FooMethod() { alert('hello'); } var fooButton; var fooForm; $(document).ready(function() { InitializeVariables(); InitiliazeDialog(); InitiliazeForm(); }); function InitializeVariables() { fooButton = $('#fooButton'); fooForm = $('#fooForm'); } function InitiliazeDialog() { var dialog = $('<div/>'); dialog.css('display', 'none'); var content = $('<p/>'); var icon = $('<span/>'); icon.addClass('ui-icon ui-icon-alert'); icon.css('float', 'left'); icon.css('margin', '0px 7px 20px 0px'); content.text('do you really want to hurt me?'); icon.prependTo(content); content.appendTo(dialog); var dialogOpenMethod = function () { dialog.dialog('open'); return false; }; var dialogOpenHandlerMethod = function (event, ui) { var widget = dialog.dialog('widget'); widget.appendTo(fooForm); var overlay = widget.prev(); overlay.css('z-index', 999); overlay.appendTo(fooForm); widget.css('position', 'fixed'); widget.css('top', '50%'); widget.css('margin-top', widget.height() / 2 * -1); widget.css('left', '50%'); widget.css('margin-left', widget.width() / 2 * -1); }; var submitMethod = function () { dialog.dialog('option', 'closeOnEscape', false); var widget = dialog.dialog('widget'); var yesButton = $(':button:eq(0)', widget); var noButton = $(':button:eq(1)', widget); var closeButton = $('a.ui-dialog-titlebar-close', widget); noButton.remove(); closeButton.remove(); fooButton.unbind('click', dialogOpenMethod); fooButton.click(); }; dialog.dialog({ autoOpen: false, modal: true, buttons: { 'Ja': submitMethod, 'Nein': function () { dialog.dialog('close'); } }, open: dialogOpenHandlerMethod }); fooButton.bind('click', dialogOpenMethod); } function InitiliazeForm() { fooButton.button(); fooForm.submit(function () { alert('doing a submit'); }); } </script> <input type="submit" id="fooButton" value="submit it!" onclick="FooMethod();"></input> </form> </body> </html> what am i doing? i want a modal-confirmation: user clicks on button, confirmation "do you really want to...?", user clicks "yes", this click unbinds the original click-handler and clicks the button again (which should cause a submit). what/why is not working? indeed you need a special case. this demo won't work, unless you set modal: false. interesting to mention: the original handler (onclick="FooMethod();") is called in modal and non-modal dialog. can anybody help me out? thanks in advance! i also opened a ticket on jqueryUI for this

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  • How can you block access form internet explorer in asp mvc

    - by Chase Aucoin
    I love microsoft development products! I hate microsoft browsers... I have made the decision to cut ties with internet explorer until they add support for some common W3 approved items. Namely 'multiple' in forms as well as about 5 other things... and as such I would like to urge my visitors to use a better browser. is there a way to setup an http handler or perhaps something in the asax file to route all ie users to a custom page? Thanks for the help! p.s. microsoft why must you make me love you and hate you.

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  • Mobile Safari Youtube opened via javascript

    - by Squeegy
    We have a youtube player embedded in a plage in Mobile Safari and it works great. But we need to be able to launch the youtube player by a means other than user tapping the video itself, for various reasons. So I am trying to figure out what event to trigger in javascript to make it happen with no luck. None of the following appear to work. var vid = document.getElementById('vid'); vid.click(); vid.onclick(); vid.ontouchend(); vid.ontouchstart(); vid.focus(); I tried to find an event handler added to the embedded object with this snippet, but didn't find anything. for (var key in vid) { if (typeof vid[key] == 'function') console.log(key +': '+ vid[key]); } Is this just so wrapped up in a custom plugin there is no way?

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  • How do I track images embedded in HTML?

    - by ycseattle
    Hi, I'd like to track the views/impressions of images on web pages, but still allow the images to be embedded in HTML, like in the "img src="http://mysite.com/upload/myimage.jpg"/" element. I know in Windows I can write a handler for ".jpg" so the URL will actually trigger a handling function instead of loading the images from disk. Is it possible to do that in python/django on Ubuntu server? Can web browser still cache the jpg files if it is not a straight file path? It looks to me that this is how google picasaweb handles the image file name. I'd like to get some ideas on how to implement that. Thanks! -Yi

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  • Getting 'this' pointer inside dependency property changed callback

    - by mizipzor
    I have the following dependency property inside a class: class FooHolder { public static DependencyProperty CurrentFooProperty = DependencyProperty.Register( "CurrentFoo", typeof(Foo), typeof(FooHandler), new PropertyMetadata(OnCurrentFooChanged)); private static void OnCurrentFooChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { FooHolder holder = (FooHolder) d.Property.Owner; // <- something like this // do stuff with holder } } I need to be able to retrieve a reference to the class instance in which the changed property belongs. This is since FooHolder has some event handlers that needs to be hooked/unhooked when the value of the property is changed. The property changed callback must be static, but the event handler is not.

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  • Why does my program occasionally segfault when out of memory rather than throwing std::bad_alloc?

    - by Bradford Larsen
    I have a program that implements several heuristic search algorithms and several domains, designed to experimentally evaluate the various algorithms. The program is written in C++, built using the GNU toolchain, and run on a 64-bit Ubuntu system. When I run my experiments, I use bash's ulimit command to limit the amount of virtual memory the process can use, so that my test system does not start swapping. Certain algorithm/test instance combinations hit the memory limit I have defined. Most of the time, the program throws an std::bad_alloc exception, which is printed by the default handler, at which point the program terminates. Occasionally, rather than this happening, the program simply segfaults. Why does my program occasionally segfault when out of memory, rather than reporting an unhandled std::bad_alloc and terminating?

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  • Is there a way to animate on a Home Widget?

    - by David
    Hi All, I want to use an animation on a Home page Widget, i.e. an AppWidgetProvider. I was hoping to use the "Frame Animation" technique: http://developer.android.com/guide/topics/graphics/2d-graphics.html#frame-animation which I've used successfully in an activity. But I can't translate that code to an AppWidgetProvider. Basically, in an AppWidgetProvider, I create and work with a RemoteViews object, which AFAIK doesn't provide me with a method to get a reference to an ImageView in the layout for me to call start() on the animation. There is also not a handler or a callback for when the widget displays so I can make the start() call. Is there another way this can be done? I suppose that I can probably do the animation on my own with very fast onUpdate() calls on the widget, but that seems awfully expensive.

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