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• Audio/video streaming on Windows platform

  - by bushtucker

  I'm building an interactive language learning application to be used in a classroom environment. The idea is that a teacher should be able to talk to the students (=audio stream to all students), let students talk to each other (= audio P2P) in groups of two or more, let students watch a video coming from a the DVD player or coming from a media server. It should be possible to save the audio/video streams. The teacher should also be able to monitor, take-over or block the desktop of the students. The platform is Windows and it's a desktop application, no web application. The audio delay should be as minimal as poosible. Optionally a student sitting at home should be supported, but it's not a high priority. I am now finished with the classroom control part of the application (login, monitor, block, ...) and want to start the audio and video part. I've been evaluating several options like DirectX, GStreamer and SIP but now I have to make a decision. DirectX seems an obvious choice for the Windows platform, but it only lets me capture and playback audio and video. The encoding/decoding/network part I should do myself. GStreamer contains all kinds of options to capture/encode/stream/save audio and video streams. I've experimented a bit with it (ossbuild) and it does seem to involve a lot of trial and error to make something work: - microphone capture (via directsoundsrc) produces cracking noises on some computers - rtpL16 payloader didn't work well - streaming raw audio over the network only working at a sampling rate of 8000, no higher - there are a lot of errors when receiving mpeg4 video (bad I-frame), on some computers worse than others It is my impression that gstreamer is primary targetted at linux platforms. Development and support for the Windows platform seems to be a little behind. Nevertheless it's a powerful framework that could save me months and years of work. SIP seems to be able to do everything I want, but it is targeted towards telephony and IM. I don't know how flexible SIP is. It seems to me that the SIP layer would just be overhead as I already have a central (teacher) application that can control and setup all the streams. The interesting parts of frameworks like opalvoip and freeswitch are the actual audio/video capture, the encoding and transmission. Does anyone know how these interesting parts relate a framework like gstreamer? Are they easy to integrate into a custom application? Are they flexible enough? Does anyone have experience with all or one of these technologies? Maybe there are even other options I can look at? Many thanks for your advice

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• Glowing Label Controls On A Glass Surface

  - by j-t-s

  Is there any way, and any tutorials, articles, samples around that allow each and every new Label Control created at runtime to have a Glow around it, just like on Vista/7? Thank you

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• Android mock location on device?

  - by Isaac Waller

  How can I mock my location on a physical device (Nexus One)? I know you can do this with the emulator in the Emulator Control panel, but this doesn't work for a physical device.

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• Question about Architecture for Viewing Images in ASP.NET MVC App

  - by Charlie Flowers

  I have an approach in mind for an image viewer in a web app, and want to get a sanity check and any thoughts you stackoverflowers might have. Here's the whirlwind nutshell summary: I'm working on an ASP.NET MVC application that will run in my company's retail stores. Even though it is a web application, we own the store machines and have control over them. We have a "windows agent" running on the store machine which we can talk to from the browser via javascript (it is a WCF service, and our web app has permission to talk to it from the browser). One of the web pages needs to be an "image viewer" page with some common things like Rotate & Zoom. Now, there are some WebForms controls that offer Rotate and Zoom. However, they take up server resources and generate a good bit of traffic between the server and the browser. For example, the Rotate function would cause an ajax call to the server, which would then generate a new image written to a .NET Canvas object, which would then be written to a file on the server, which would then be returned from the ajax call and refreshed inside the browser. Normally, that's a pretty good way of doing things. But in our case, we have code running on the store machine that we can communicate with. This leads me to consider the following approach: When the user asks to view an image, we tell our "windows agent" to download it from our image server to the store machine. We then redirect our browser to our image viewer page, which will pull the image from the local file we just wrote to the store machine. When the user clicks "Rotate", we cause JavaScript code in the browser to call our "windows agent" software, asking it to perform the "Rotate" function. The "windows agent" does the rotation using the same kind of imaging control that would formerly have been used on the server, but it does so now on the store machine. Javascript in the browser then refreshes the image on the page to show the newly rotated image. Zoom and similar features would be implemented the same way. This seems to be much more efficient, scalable, and responsive for the end-users. However, I've never heard of anything like it being done, mostly because it's rare to have this combination of a web app plus a "windows agent" on the client machine. What do you think? Feasible? Reasonable? Any pitfalls I overlooked or improvements / suggestions you can see? Has anyone done anything like this who would like to offer the wisdom of experience? Thanks!

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• How to enable haptic feedback on button view

  - by Funkyidol

  Hi, I want to add haptic feedback to my application buttons and control them programatically to show button state (enabled and disabled) The default haptic feedback setter works only for long press. How can i make it work for simple button clicks. Amd is there a way to have haptic feedback on events like touch move??

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• Coroutines in Java

  - by JUST MY correct OPINION

  I would like to do some stuff in Java that would be clearer if written using concurrent routines, but for which full-on threads are serious overkill. The answer, of course, is the use of coroutines, but there doesn't appear to be any coroutine support in the standard Java libraries and a quick Google on it brings up tantalising hints here or there, but nothing substantial. Here's what I've found so far: JSIM has a coroutine class, but it looks pretty heavyweight and conflates, seemingly, with threads at points. The point of this is to reduce the complexity of full-on threading, not to add to it. Further I'm not sure that the class can be extracted from the library and used independently. Xalan has a coroutine set class that does coroutine-like stuff, but again it's dubious if this can be meaningfully extracted from the overall library. It also looks like it's implemented as a tightly-controlled form of thread pool, not as actual coroutines. There's a Google Code project which looks like what I'm after, but if anything it looks more heavyweight than using threads would be. I'm basically nervous of something that requires software to dynamically change the JVM bytecode at runtime to do its work. This looks like overkill and like something that will cause more problems than coroutines would solve. Further it looks like it doesn't implement the whole coroutine concept. By my glance-over it gives a yield feature that just returns to the invoker. Proper coroutines allow yields to transfer control to any known coroutine directly. Basically this library, heavyweight and scary as it is, only gives you support for iterators, not fully-general coroutines. The promisingly-named Coroutine for Java fails because it's a platform-specific (obviously using JNI) solution. And that's about all I've found. I know about the native JVM support for coroutines in the Da Vinci Machine and I also know about the JNI continuations trick for doing this. These are not really good solutions for me, however, as I would not necessarily have control over which VM or platform my code would run on. (Indeed any bytecode manipulation system would suffer similar problems -- it would be best were this pure Java if possible. Runtime bytecode manipulation would restrict me from using this on Android, for example.) So does anybody have any pointers? Is this even possible? If not, will it be possible in Java 7?

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• ASP .NET Multiple Custom Validators on a single page

  - by Dan7el

  Can you have more than one CustomValidator on a single page? I have two separate CustomValidators with two separate controls on one page. Both ServerValidateEventHandlers are setup for each control. The issue is that it only fires on the first event handler twice.

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• Subversion. Metrics. Get lines of added/updated code for each file in check-in programmatically

  - by w1z

  Hi all, I need your advice. In my application I need to get programmatically such metrics for users check-ins as lines of added/updated code for each file in check-in. This app is writed on c# and uses the Subversion as version control system. How can I do it? Offer me your ideas please... Thanks a lot! (:

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• Flex: How do you validate 2 password fields to make sure they match?

  - by Shawn Simon

  I want to use a validator to ensure 2 password fields match in Flex. I want the validator to highlight form fields like a normal flex validation control. Thanks.

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• Sending postback to ajax loaded user controls.

  - by Paul Knopf

  I have a set of tabs, which all of them together contain alot of data. I am making the tabs load async. I have one button above the tabs used to save changes. I need this button to send a postback to all the loaded user controls (using this). I need the user control to handle this postback so it can save changes. What do you think? Any suggestions?

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• What can you do with AppleScript?

  - by mtwisterr

  Everything I know about AppleScript I taught myself and was wondering if I missed any cool features. I know you can make the computer talk to and control applications but is there anything else it can do or is it time to move on to a new language?

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• Silverlight 4.0 PDF Viewer

  - by xscape

  Any free control to view PDF for Silverlight? or how to view pdf in silverlight from memory stream?

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• How to order actions in menus in Eclipse RCP

  - by Marcos Scriven

  If I add action within an extension point thus: <action class="com.mycompany.MyAction" id="mycompany.myaction.MyAction" menubarPath="actions" /> How can I control its ordering programatically? It looks like they are simply ordered alphabetically according to their ID. I don't want to have to give them names such as '001-z', '002-a', just to get 'z' to appear before 'a'. It would also be a nightmare re-ordering them later.

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• how to get inline javascript to fire with jQuery

  - by lloydphillips

  I have a javascript action on a div (asp.net panel) as an onkeypress attribute. This is the default action button on an asp.net Panel control. It contains the following: onkeypress="javascript:return WebForm_FireDefaultButton(event, 'ctl00_cp1_ucInvoiceSearch_btnSearch')" For some reason when I change my textbox to a jQuery textbox clicking enter no longer fires this div. Why and how can I hook it back up so when I enter text in the textbox and click enter it fires? Lloyd

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• Is ASP.NET membership, role management and Profile usable in a C# Class Library?

  - by afsharm

  I know it's possible to use this information in a winform, wpf or console application. But I rather to determine which user with what roles are running a sepecific method, so I could decide upon them and run different codes. In addition in a desktop app. how a user can login? Is there any special winform or wpf login control?

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• Properties window like visual studio in Silverlight

  - by Meysam Javadi

  suppose this scenario: there is a design panel like XAML designer that i added some Controls on it(in run-time with create instance of some element and add it to RootLayout.Children). now i like manipulate some properties of one control(that i now which one) with something like this. is there a any short approach to goal?

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• Send an onclick to a dropdown list

  - by P Nelson

  Is it possible to show the list of items in a dropdown list when the user presses the up or down arrow keys, when focus is on that dropdown control? I think this would involve sending an onclick to the dropdown list using onkeydown for Keycode 38(arrow up) & 40(arrow down)? But I cannot figure out how to do this.

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• can not access MovieClip properties in flashDevelop

  - by numerical25

  I know there is something I am doing wrong. In my controls I have keydown events that control my hero. As of right now, I am trying to rotate my hero but he refuses to turn . Below is my Hero Class, my control class, and gameobject class. pretty much all the classes associate with the controls class. package com.Objects { import com.Objects.GameObject; /** * ... * @author Anthony Gordon */ [Embed(source='../../../bin/Assets.swf', symbol='OuterRim')] public class Hero extends GameObject { public function Hero() { } } } Here is my Controls class. This is the class where I am trying to rotate my hero but he doesnt. The keydown event does work cause I trace it. package com.Objects { import com.Objects.Hero; import flash.events.*; import flash.display.MovieClip; /** * ... * @author Anthony Gordon */ public class Controls extends GameObject { private var aKeyPress:Array; public var ship:Hero; public function Controls(ship:Hero) { this.ship = ship; IsDisplay = false; aKeyPress = new Array(); engine.sr.addEventListener(KeyboardEvent.KEY_DOWN, keyDownListener); engine.sr.addEventListener(KeyboardEvent.KEY_UP,keyUpListener); } private function keyDownListener(e:KeyboardEvent):void { //trace("down e.keyCode=" + e.keyCode); aKeyPress[e.keyCode] = true; trace(e.keyCode); } private function keyUpListener(e:KeyboardEvent):void { //trace("up e.keyCode=" + e.keyCode); aKeyPress[e.keyCode]=false; } override public function UpdateObject():void { Update(); } private function Update():void { if (aKeyPress[37])//Key press left ship.rotation += 3,trace(ship.rotation ); ///DOESNT ROtate }//End Controls } } Here is GameObject Class package com.Objects { import com.Objects.Engine; import com.Objects.IGameObject; import flash.display.MovieClip; /** * ... * @author Anthony Gordon */ public class GameObject extends MovieClip implements IGameObject { private var isdisplay:Boolean = true; private var garbage:Boolean; public static var engine:Engine; public var layer:Number = 0; public function GameObject() { } public function UpdateObject():void { } public function GarbageCollection():void { } public function set Garbage(garb:Boolean):void { garbage = garb; } public function get Garbage():Boolean { return garbage } public function get IsDisplay():Boolean { return isdisplay; } public function set IsDisplay(display:Boolean):void { isdisplay = display; } public function set Layer(l:Number):void { layer = l; } public function get Layer():Number { return layer } } }

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• VWD 2008 Express : where can i set absolute positioning as a default?

  - by Justin

  So when I used Visual Web Developer 2005 Express edition, in the ribbon there was a menu option for "Layout", which you could go through and select positioning and set absolute to default. I am using Visual Web Developer 2008 Express now, and I see that you can select format from the menu bar, and set position absolute, for each individual control that you add to the design surface, but is there a place I can just set absolute as the default, like in 2005? Thanks, Justin

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• NHibernate - auto generate timestamp on create and update ?

  - by driis

  I am trying to map an entity in NHibernate, that should have an Updated column. This should be the DateTime when the entity was last written to the database (either created or updated). I'd like NHibernate to control the update of the column, so I don't need to remember to set a property to the current time before updating. Is there a built-in feature in NHibernate, that can handle this for me ?

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• Masked Input Using EditText Widget in Android

  - by Buzzy

  Is there a way I can specify an input mask to the EditText control in Android? I want be able to specify something like ### - ## - #### for a Social Security Number. This will cause any invalid input to be rejected automatically (example, I type alphabetical characters instead of numeric digits). I realize that I can add an OnKeyListener and manually check for validity. But this is tedious and I will have to handle various edge cases. Buzzy

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• How do I select a column with the latest "datetime" data type?

  - by Greg McNulty

  How do I select a column with the latest "datetime" data type, in Visual Web Developer 2008, ASP.NET 3.5 ? In the config data source WHERE option my options are greater than cookie, control, etc... but I would like to select where the datetime is the latest in the table. (Select row from table where datetime is last updated....) Thank You.

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• Insert at caret position with a Silverlight textbox

  - by Chris S

  In WPF you can insert at the caret position using the CaretIndex property. However this seems to be missing in the Silverlight textbox control. Is it possible using a different technique?

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• Need html code of GridView within C# code.

  - by IrfanRaza

  Hello friends, I am having an aspx page with a user control in it. The usercontrol contains the GridView. At some place within this usercontrol i need html code of GridView. Can anybody provide help on how i can get html code of GridView. Thanks for sharing your time.

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• WPF List - ListItem Visibility

  - by niao

  Greetings, I have a FlowDocument where List control is placed. Inside this list I have some ListItem. Is there any way to set some kind of Visibility for specific ListItem? I don't see a coressponding Property like Visibility for ListItem. When I set fontsize="0.1" then application hangs (it goes into infinite loop).

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