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• Trying to build automatic audio-conferencing capability into a WebApp

  - by Keller

  Hey all, I'm working with a team of relatively novice programmers, and we are trying to create a site that will have audio-conferencing capabilities such that whenever someone visits the page, they will immediately have audio-conferencing capabilities with everyone else on the page (5 people max). Can anyone point us in a general direction? Should we be looking into building a custom app, leveraging audio conferencing software, or trying to mimic a webex program? Would Adobe Stratus be useful in getting this kind of functionality? Does anyone have any ideas about how we would design something like this on a macro level? Sorry for the noobish question, but any guidance would be deeply appreciated. Thanks, Keller

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• Can you let users upload Sinatra apps and run them inside Rails as middleware?

  - by Brian Armstrong

  I want to let users write small custom apps (think themes or plugins on Wordpress) and upload/run them on my site. I'm thinking about using Sinatra apps for this since it would give the users a lot of flexibility, and then running them as middleware inside my rails app. But I can't figure out the security implications of this. I tried creating a simple sinatra app as middleware, and it has access to all the rails models and everything - so that is bad. Is there a way for rack to keep these separate so that the sinatra apps are effectively sandboxed and can't do any bad things (outside of an API or some specific way I setup for them to communicate)? There may be an easier way to accomplish this that I haven't thought of too, so ideas welcome. Thanks!

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• UITableView and keyboard scrolling problem

  - by Jonathan

  after a lot of trial and error, I'm giving up and asking the question. I've seen a lot of people with similar problems but can't get all the answers to work right. I have a UITableView which is composed of custom cells. The cells are made of 5 text fields next to each other (sort of like a grid). When I try to scroll and edit the cells at the bottom of the UITableView, I can't manage to get my cells properly positioned above the keyboard. I have seen many answers talking about changing view sizes,etc... but none of them has worked nicely so far. Could anybody clarify the "right" way to do this with a concrete code example? Thanks in advance, Jonathan

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• Google Gadgets and external scripts

  - by Brandon Durham

  I'm trying to create my first custom Google Gadget to be used privately in my company's Google Sites intranet. Ideally I'd like to just show a thumbnail that the user can click that will open a modal window with the full video. This requires my including a couple of small JS libraries in my widget. For my widget I created this XML: <?xml version="1.0" encoding="UTF-8"?> <Module> <ModulePrefs title="Video Demos" /> <Content view="url" href="http://www.website.com/_gadgets/video.php"> </Content> </Module> The "video.php" page has simple HTML on it and includes two JS files for the modal window using but doesn't work. Are you not able to include external scripts like this? If not, what are my options here?

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• Decoration View *above* cells in UICollectionView

  - by Dhiraj Gupta

  I've got a decoration view showing the way I want, in my UICollectionView. The position and size is right. The decoration view stays at the frame I'm setting for it in my layout. But, I want the decoration view to be above the cells, not below them. I tried setting the zIndex property on the UICollectionViewLayoutAttributes for the decoration view, but this has no effect - I tried logging out the zindex of the cells, and they're all returning 0, and my decoration view's zIndex is set to 20. I'm guessing having decoration views above the cells is not supported, at least in UICollectionViewFlowLayout? Someone please confirm this, thanks! In the meantime, I'm going back to having a custom UIView subclass as a subview in the parent controller of the collection view and laying out the frame of it in the - (void) viewWillLayoutSubviews() method.

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• How to keep the session of user login?

  - by YaW

  Hi, I have an app that requires user to register. I've got the app conected to PHP in my server to do the logic of register/login and so, this is not problem at all. But, I want to keep a session of the user in local, so the user doesn't have to login again every time he runs the app. So, I want something like this: First time user, he opens the app, register and login. Do some stuff with the app and closes it. Open the app again, the user is recognized so he doesn't need to login again. I only need to store an ID and a Username (both fetched from the DB in the login php method). What's the best way to do this?? I've thought about doing a custom preference, store the data in files or even a local DB (sqlite). Any suggestions?

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• BindData to ITemplate for GridView in code behind

  - by tbischel

  How do I programmatically bind data to a custom item template column for a GridView? So far, I've done something similar to this: TemplateField foo = new TemplateField(); foo.ItemTemplate = new bar(); this.GridView1.Columns.Add(foo); where bar is like this: public class bar : ITemplate { public bar() { } public void InstantiateIn(Control container) { DropDownList ddl = new DropDownList(); container.Controls.Add(ddl); } } (the actual dropdownlist is populated) But ITemplate doesn't contain any kind of data binding properties to implement, and the TemplateField class doesn't seem to have any either... What do I do?

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• KO 2.3.4 - Accessing validation array from callbacks in models

  - by kenny99

  Hi, Apologies if this is an oversight or sheer stupidity on my part but I can't quite figure out how to access the validation array from a callback in a model (using ORM and KO 2.3.4). I want to be able to add specific error messages to the validation array if a callback returns false. e.g This register method: public function register(array & $array, $save = FALSE) { // Initialise the validation library and setup some rules $array = Validation::factory($array) ->pre_filter('trim') ->add_rules('email', 'required', 'valid::email', array($this, 'email_available')) ->add_rules('confirm_email', 'matches[email]') ->add_rules('password', 'required', 'length[5,42]') ->add_rules('confirm_password', 'matches[password]'); return ORM::validate($array, $save); } Callback: public function email_available($value) { return ! (bool) $this->db ->where('email', $value) ->count_records($this->table_name); } I can obviously access the current model from the callback, but I was wondering what the best way to add custom error from the callback would be?

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• Sharepoint-Log on to Remote Desktop-Webpart

  - by Hari Gillala

  Hi, I have to develop a webpart which will be deployed in the live Environment. I have to login to a remote server(windows 2003) and open up Sql Management Studio and Log on to the another server(SQL server using the IP address). I have to open a specific store procedure and change one of the parameter to true and exceute the stored Procedure. I know it is very easy to accomplish but, where do I start? Could anybody direct me in right direction Please? I will be using c#.net and VS 2008 to develop this custom webpart. Many Thanks Hari Gillala

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• When is a C++ terminate handler the Right Thing(TM)?

  - by Joseph Garvin

  The C++ standard provides the std::set_terminate function which lets you specify what function std::terminate should actually call. std::terminate should only get called in dire circumstances, and sure enough the situations the standard describes for when it's called are dire (e.g. an uncaught exception). When std::terminate does get called the situation seems analagous to being out of memory -- there's not really much you can sensically do. I've read that it can be used to make sure resources are freed -- but for the majority of resources this should be handled automatically by the OS when the process exits (e.g. file handles). Theoretically I can see a case for if say, you needed to send a server a specific message when exiting due to a crash. But the majority of the time the OS handling should be sufficient. When is using a terminate handler the Right Thing(TM)? Update: People interested in what can be done with custom terminate handlers might find this non-portable trick useful.

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• Cannot change the Label text!

  - by BDotA

  I have created a custom control and added a label property to it so at design time we can pick a Label and assign it to that control. so basically I want that if a label is assigned to that control, its text should change as below and also its text should change to bold font, so here is that code: private Label assignedLabel; public Label AssignedLabel { get { return assignedLabel; } set { assignedLabel = value; assignedLabel.Text = @"*" + assignedLabel.Text; assignedLabel.Font = new Font(AssignedLabel.Font, FontStyle.Bold); AssignedLabel.Refresh(); } } the problem is that based on the code above the Font of that assigned label is correctly changing to Bold font, but its Text is not taking affect. why is that happening? how can I fix this issue?

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• API access to a manually-created Google Map

  - by rutherford

  I have a number of public custom Google Maps created via http://maps.google.com/ - obviously associated with my google account. Can I access these maps via the Google Maps javascript api? The api doesn't appear to work with the manually created maps located on maps.google.com from what I can tell? And if not, is there another way to store overlay data (markers, etc) that the javascript api can grab and load into the map on the client's browser? Am thinking a service like dabbleDB, except that I don't think they offer write access via javascript (this would be necessary for the user adding markers to the map, for example) Obviously I could create a db layer on my server, but am looking for a 'cloud' solution that removes the strain from my databases!!

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• Calling C function from DTrace scripts

  - by dmeister

  DTrace is impressive, powerful tracing system originally from Solaris, but it is ported to FreeBSD and Mac OSX. DTrace uses a high-level language called D not unlike AWK or C. Here is an example: io:::start /pid == $1/ { printf("file %s offset %d size %d block %llu\n", args[2]->fi_pathname, args[2]->fi_offset, args[0]->b_bcount, args[0]->b_blkno); } Using the command line sudo dtrace -q -s <name>.d <pid> all IOs originated from that process are logged. My question is if and how it is possible to call custom C functions from a DTrace script to do advanced operations with that tracing data during the tracing itself.

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• iPhone filesystem permissions POSIX-compliant?

  - by Seva Alekseyev

  Hi all, I'm trying to pass some files from one app to another. I communicate the path (via a custom URL). The target application cannot read the file, citing errno 13 (permission denied). I've checked the permissions on file - they're 0644 (O+R), the permissions on directories all the way up to the root are 755 (O+RX). From a POSIX perspective, the file should be readable to any process and any user. Yet it's not. Any ideas, please? I can think of some workarounds. I could use a Web service (upload, get a cookie, communicate the cookie to the other app, other app downloads). I could also pass the actual file data in the URL - unelegant, and probably subject to length limitations. Clipboard is not supported on iPhone OS 2 IIRC.

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• Building static nav in concrete5

  - by hollyb

  I've inherited a site built with the CMS concrete5. I'm just starting to dissect it but was hit with a wicked short deadline on a complete overhaul to the nav. So, I want to build out a static nav and then go back when I have more time and integrate it with the auto-nav. Does anybody have experience working with concrete5? If so: Where would I drop my custom static nav? Is it possible to select it from the admin (so that the current one is still available if the client wants to switch back via the admin)? Thanks!

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• Problem with signals and slots

  - by Jen

  I am creating a class with custom slots in Qt: class CustomEdit : public QTextEdit { Q_OBJECT public: CustomEdit(QWidget* parent); public slots: void onTextChanged (); }; However, I'm getting thise linker error: undefined reference to 'vtable for CustomEdit' The documentation says: if you get compiler errors along the lines of "undefined reference to vtable for LcdNumber", you have probably forgotten to run the moc or to include the moc output in the link command. ... but it is not obvious what that means. Is there something I need to add to my class, or to the .pro file?

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• How to Serialize a WPF Drawing?

  - by Néstor Sánchez A.

  Hi, maybe I'm missing something. I believed that WPF vector-based Drawings (like DrawingGroup, DrawingGeometry, etc.) were ready to be serialized. But they are not. So, should I navigate all these drawing childrens, and store they points, lines, brushes (that also are not serializable) and so on, and then made my custom serialization? Is really that difficult or I'm missing something pretty obvious? I mean, even serializing Bitmap images is easy. I thinked serializing vector-based drawings were easier (no quality loss, just descriptive info, no massive data). Thanks for your practical answers, alternate-way suggestions and comments!

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• Stop propagating deletes

  - by Mark

  Is it just me or is anyone else finding EF very difficult to use in a real app :( I'm using it as the data layer and have created custom business objects. I'm having difficulty converting the business objects back to EF objects and updating/adding/deleting from the database. Does anyone know a good, simple example of doing this? Actually the current problem that's driving me nuts is when I delete something EF tries to delete other related stuff as well. For example, if I delete an invoice it will also delete the associated customer! Seems odd. I can't figure out how to stop it doing this. // tried: invoiceEfData.CustomerReference = null; // also tried invoiceEfData.Customer = null; context.DeleteObject(invoiceEfData); context.SaveChanges(); // at this point I get a database error due to it attempting to delete the customer

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• creating my own context processor in django

  - by dotty

  Hay, I have come to a point where i need to pass certain variables to all my views (mostly custom authentication type variables). I was told writing my own context processor was the best way to do this, but i am having some issues. My settings file looks like this TEMPLATE_CONTEXT_PROCESSORS = ( "django.contrib.auth.context_processors.auth", "django.core.context_processors.debug", "django.core.context_processors.i18n", "django.core.context_processors.media", "django.contrib.messages.context_processors.messages", "sandbox.context_processors.say_hello", ) As you can see i have a module called 'context_processors' and a function within that called 'say_hello'. This looks like def say_hello(request): return { 'say_hello':"Hello", } Am i right to assume i can now do this within my views {{ say_hello }} because it doesn't return anything.

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• Setting refresh-policies in Ehcache

  - by Alex Ciminian

  Is there any to specify a data refresh policy in Ehcache? I am currently migrating an application from OSCache to Ehcache and I can't seem to find any way to specify when an element needs refreshing, besides setting timeToIdle and timeToLive. What I want is: on accessing an element from the cache, check with it's associated resource to see if it was updated later than the lastUpdateTime of the cache element. If yes, refresh the cache; else serve the content from the cache. In OSCache this was done by catching NeedsRefreshExceptions and setting custom refresh policies for the elements. I've been digging around in the docs for a while now, but I wasn't able to find any methods or examples of how I could accomplish this in Ehcache. Any help would be appreciated :). Alex

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• Adding STI to Existing Table...

  - by keruilin

  I want to add STI to an existing table using a custom type column. Let's call this taste_type whose corresponding model is Fruit. In the Fruit model I have: set_inheritance_column :taste_type In my migration to add STI I have: class AddSTI < ActiveRecord::Migration def self.up add_column :fruits, :taste_type, :string, :limit => 100, :null => false Fruit.reset_column_information Fruit.find_by_id(1).update_attributes({:taste_type => 'Sour'}) end def self.down remove_column :fruits, :taste_type end end When I run the migration, I get the following error: Mysql::Error: Column 'taste_type' cannot be null: ... Any idea what's going? I can get the migration to run if I comment the set_inheritance_column in the Fruit model, then uncomment it after I run the migration. Obviously, I don't want to do this, however.

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• Help repaiting a Component

  - by serhio

  I am working with Microsoft.VisualBasic.PowerPacks.RectangleShape, but the question is common for components or controls in general. I added to a TextRectangleShape : RectangleShape a Text property: Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs) MyBase.OnPaint(e) Dim f As Font = Me.Font Dim g As Graphics = e.Graphics Dim textRect As Rectangle = New Rectangle(Me.Location, Me.Size) Using br As New SolidBrush(Me._TextColor) g.DrawString(_Text, f, br, textRect) End Using End Sub Now when I move this control the text does not disappear from the former location. Maybe I could invalidate each time the Parent in the OnPaint, but if this is not a good solution if the parent has a time consuming repaint logic or I have a lot of my custom component moving at the same time. How do I properly repaint the component?

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• How to customize the ColorPicker class in Adobe flex3.0?

  - by Ankur Sharma

  i have to make the colorpiker tool of flex, to be a customized one, i beleive you have seen the color picker tool of flex, when you click on the colorpicker, a swatch panel gets open, right?? now in that swatch, there are three compoenents, one is thw colorbox(on top left), beside right to this is the text field holding the hex code of the color and below these two tools, is the colors present in the small rectangles, now my need is this, i want to add three more buttons on the top empty space after textfield, so that structure of the colors pciker looks like this colorbox | textfield | button1 | button2 | button3 color rectangles, showing all default colors i beleive u understood, what i meant here, so plzz help me out in making a custom colorpciker class, thanx Namaste

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• How do I create a class associated with a windows form in C#?

  - by xarzu

  Now that C++ development has become second nature to me, do I have to start from scratch with C#? Since the beginning of Visual Studio, there has been easy way to describe the shape of a Dialog (now called a Form) in the resource file and then use a wizard to create the corresponding C++ code. I kind of remember that in MFC it was pretty much a no-brainer to create a custom dialog with all the components you want and then all the associated code. If I have a C# app that has many forms that I want to bring to the screen based on the user's menu selections, how do I create a class associated with a windows form?

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• Displaying a list of Items in a WPF form using XAML

  - by Dave Colwell

  Hi guys, I am attempting to display a list of items (the style and controltemplate for these items are defined elsewhere) and i want to be able to add/remove as many as i want to. As i do not have infinite screen realestate I am displaying these in a ListBox control. This is the screen i have to date: What is going to happen is this. When i click the New button, i want the item to appear in the outlined area. So now for the problem: I want, when i click the New... Button, a new item to appear in the ListBox (outlined). Is it possible to do this using XAML? I am trying to work on seperating the business logic from the interface, so if there were some way to acheive this in XAML i would appreciate it. If not,can i use the custom templated item i have created in C# so that it will appear as the template specifies in the list box instead of like a normal ListBoxItem Thanks in advance!

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