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• How to write a Media Center plugin like the Netflix plugin? Source code/reference samples?

  - by Vin

  I am looking to write a Windows Media Center plugin just like the Netflix WMC plugin. Once logged in, I know the streaming urls that I need to hook in to. Any source code, reference samples would be great. Found one on codeplex for swedish TV channels, but right now it's not working for some reason... Previously asked the following question, with no answers, so updated with a question asked in a easy to relate fashion Host a streaming video in my client, from a streaming url that is behind a login session? I am building a Silverlight 4 desktop client to show streaming video from a site that is login based. So that website has a Silverlight player that does streaming video, the player is behind a login sesion, so just by getting the url from fiddler and trying to play it in my Silverlight 4 desktop client won't work. Actually after that, I want to build a Windows Media Center plugin to build a Netflix-like client, that allows login through WMC and then allows you to watch streaming video. Any pointers on how to go about doing any of this?

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• WPF ICommand over a button

  - by toni

  I have implemented a custom IComand class for one of my buttons. The button is placed in a page 'MyPage.xaml' but its custom ICommand class is placed in another class, not in the MyPage code behind. Then from XAML I want to bind the button with its custom command class and then I do: MyPage.xaml: <Page ...> <Page.CommandBindings> <CommandBinding Command="RemoveAllCommand" CanExecute="CanExecute" Executed="Execute" /> </Page.CommandBindings> <Page.InputBindings> <MouseBinding Command="RemoveAllCommand" MouseAction="LeftClick" /> </Page.InputBindings> <...> <Button x:Name="MyButton" Command="RemoveAllCommand" .../> <...> </Page> and the custom command button class: // Here I derive from MyPage class because I want to access some objects from // Execute method public class RemoveAllCommand : MyPage, ICommand { public void Execute(Object parameter) { <...> } public bool CanExecute(Object parameter) { <...> } public event EventHandler CanExecuteChanged { add { CommandManager.RequerySuggested += value; } remove { CommandManager.RequerySuggested -= value; } } } My problem is how to say MyPage.xaml that Execute and CanExecute methods for the button is in another class and not the code behind where is placed the button. How to say these methods are in RemoveAllCommand Class in XAML page. Also I want to fire this command when click mouse event is produced in the button so I do an input binding, is it correct? Thanks

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• How to set binding in xaml to my own variable

  - by Victor

  Hello. I have an object in the code: public class UserLogin { bool _IsUserLogin = false; public bool IsUserLogin { get { return _IsUserLogin; } set { _IsUserLogin = value; } } public UserLogin() { _IsUserLogin = false; } } .... public static UserLogin LoginState; ..... LoginState = new UserLogin(); And I need to set bindings to Button.IsEnabled property. I.e. when user not login yet - some buttons are disabled. How can this been done? I have try in xaml: <Button DataContext="LoginState" IsEnabled="{Binding Path=IsUserLogin}"> but, this dos't work and OutputWindow says: System.Windows.Data Error: 39 : BindingExpression path error: 'IsUserLogin' property not found on 'object'. I also have try to set Button.DataContext property to LoginState in the code, but have XamlParseException. I also read this one [http://stackoverflow.com/questions/1829758/wpf-binding-in-xaml-to-an-object-created-in-the-code-behind][1] but still can't set bindings. [1]: http://stackoverflow.com/questions/1829758/wpf-binding-in-xaml-to-an-object-created-in-the-code-behind. Please help!

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• Visibility of Class field-data of Mouse Clicked ImageButton located within WrapPanel

  - by Bill

  I am attempting to obtain the class-data behind an ImageButton that is mouse-clicked; which ImageButton is located within a WrapPanel filled with ImageButtons. The problem I am having is obtaining the visibility of the field data within the class behind the image-button. Although I can see the class, I can neither see nor access the field data. Can anyone please point me in the right direction? // Handles the ImageButton mouseClick event within the WrapPanel. private void SolarSystem_Click(Object sender, RoutedEventArgs e) { FrameworkElement fe = e.OriginalSource as FrameworkElement; SelectedPlanet PlanetSelected = new SelectedPlanet(fe); PlanetSelected.Owner = this; MessageBox.Show(PlanetSelected.PlanetName); } // Used to initiate instance of Class and some field data. public SelectedPlanet(FrameworkElement fe) { InitializeComponent(); string sPlanetName = ((PlanetClass)(fe)).PlanetName; return sPlanetName } // Class Data public class PlanetClass { string planetName; public PlanetClass(string planetName) { PlanetName = planetName; } public string PlanetName { set { planetName = value; } get { return planetName; } } }

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• ASP.NET Content Web Form - content from placeholder disappears

  - by Naeem Sarfraz

  I'm attempting to set a class on the body tag in my asp.net site which uses a master page and content web forms. I simply want to be able to do this by adding a bodycssclass property (see below) to the content web form page directive. It works through the solution below but when i attempt to view Default.aspx the Content1 control loses its content. Any ideas why? Here is how I'm doing it. I have a master page with the following content: <%@ Master Language="C#" ... %> <html><head>...</head> <body id=ctlBody runat=server> <asp:ContentPlaceHolder ID="cphMain" runat="server" /> </body> </html> it's code behind looks like: public partial class Site : MasterPageBase { public override string BodyCssClass { get { return ctlBody.Attributes["class"]; } set { ctlBody.Attributes["class"] = value; } } } it inherits from: public abstract class MasterPageBase : MasterPage { public abstract string BodyCssClass { get; set; } } my default.aspx is defined as: <%@ Page Title="..." [master page definition etc..] bodycssclass="home" %> <asp:Content ID="Content1" ContentPlaceHolderID="cphMain" runat="server"> Some content </asp:Content> the code behind for this file looks like: public partial class Default : PageBase { ... } and it inherits from : public class PageBase : Page { public string BodyCssClass { get { MasterPageBase mpbCurrent = this.Master as MasterPageBase; return mpbCurrent.BodyCssClass; } set { MasterPageBase mpbCurrent = this.Master as MasterPageBase; mpbCurrent.BodyCssClass = value; } } }

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• Heroku taps push weirdness...

  - by holden

  I have the strangest experience using taps to move data between my machine and heroku. It works fine except that it seems to loose 0s directly behind the decimal place for my geo coordinates. Ie 50.0519322 for some reason gets set to 50.519322... no idea why. When I pull the data from the remote location ie. heroku db:pull... it works fine, all decimal places intact on my machine, however, when i push it back to the remote server it loses these zeros. Especially directly behind the decimal place, though I haven't noticed it elsewhere yet. At first I was storing the lat and lng as simply numeric but refined it to: change_column :places, :lat, :numeric, :precision => 15, :scale => 10 change_column :places, :lng, :numeric, :precision => 15, :scale => 10 With no result, any ideas what's going on? From the console on the remote server i get the lat as being: #<BigDecimal:2aebcc5967c0,'0.50519322E2',18(18)> and my machine as: #<BigDecimal:10232f7c8,'0.50519322E2',12(16)> which is also odd, the second one because it shows up as 50.0519322 when i edit it thru my view but when i do to_f via console it gives me 50.519322

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• codingBat separateThousands using regex (and unit testing how-to)

  - by polygenelubricants

  This question is a combination of regex practice and unit testing practice. Regex part I authored this problem separateThousands for personal practice: Given a number as a string, introduce commas to separate thousands. The number may contain an optional minus sign, and an optional decimal part. There will not be any superfluous leading zeroes. Here's my solution: String separateThousands(String s) { return s.replaceAll( String.format("(?:%s)|(?:%s)", "(?<=\\G\\d{3})(?=\\d)", "(?<=^-?\\d{1,3})(?=(?:\\d{3})+(?!\\d))" ), "," ); } The way it works is that it classifies two types of commas, the first, and the rest. In the above regex, the rest subpattern actually appears before the first. A match will always be zero-length, which will be replaceAll with ",". The rest basically looks behind to see if there was a match followed by 3 digits, and looks ahead to see if there's a digit. It's some sort of a chain reaction mechanism triggered by the previous match. The first basically looks behind for ^ anchor, followed by an optional minus sign, and between 1 to 3 digits. The rest of the string from that point must match triplets of digits, followed by a nondigit (which could either be $ or \.). My question for this part is: Can this regex be simplified? Can it be optimized further? Ordering rest before first is deliberate, since first is only needed once No capturing group Unit testing part As I've mentioned, I'm the author of this problem, so I'm also the one responsible for coming up with testcases for them. Here they are: INPUT, OUTPUT "1000", "1,000" "-12345", "-12,345" "-1234567890.1234567890", "-1,234,567,890.1234567890" "123.456", "123.456" ".666666", ".666666" "0", "0" "123456789", "123,456,789" "1234.5678", "1,234.5678" "-55555.55555", "-55,555.55555" "0.123456789", "0.123456789" "123456.789", "123,456.789" I haven't had much experience with industrial-strength unit testing, so I'm wondering if others can comment whether this is a good coverage, whether I've missed anything important, etc (I can always add more tests if there's a scenario I've missed).

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• Binding ListBox to List (Collection) in XAML

  - by david2tm

  Hello, I'm learning WPF, so I'm kind of n00b in this. I saw some examples about how to do what I want to do, but nothing exactly... The question: I want to bind List to ListBox. I want to do it in XAML, w/o coding in code behind. How can I achieve that? Right now I do it that way: <!-- XAML --> <ListBox x:Name="FileList"> <ListBox.ItemTemplate> <DataTemplate> <Label Content="{Binding Path=.}"/> </DataTemplate> </ListBox.ItemTemplate> </ListBox> // Code behind public MainWindow() { // ... files = new List<string>(); FileList.ItemsSource = files; } private void FolderBrowser_TextChanged(object sender, RoutedEventArgs e) { string folder = FolderBrowser.Text; files.Clear(); files.AddRange(Directory.GetFiles(folder, "*.txt", SearchOption.AllDirectories)); FileList.Items.Refresh(); } But I want to get rid of FileList.ItemsSource = files; and FileList.Items.Refresh(); in C# code. Thanks

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• Backreferences in lookbehind

  - by polygenelubricants

  Can you use backreferences in a lookbehind? Let's say I want to split wherever behind me a character is repeated twice. String REGEX1 = "(?<=(.)\\1)"; // DOESN'T WORK! String REGEX2 = "(?<=(?=(.)\\1)..)"; // WORKS! System.out.println(java.util.Arrays.toString( "Bazooka killed the poor aardvark (yummy!)" .split(REGEX2) )); // prints "[Bazoo, ka kill, ed the poo, r aa, rdvark (yumm, y!)]" Using REGEX2 (where the backreference is in a lookahead nested inside a lookbehind) works, but REGEX1 gives this error at run-time: Look-behind group does not have an obvious maximum length near index 8 (?<=(.)\1) ^ This sort of make sense, I suppose, because in general the backreference can capture a string of any length (if the regex compiler is a bit smarter, though, it could determine that \1 is (.) in this case, and therefore has a finite length). So is there a way to use a backreference in a lookbehind? And if there isn't, can you always work around it using this nested lookahead? Are there other commonly-used techniques?

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• Namespace Problem

  - by Tarik

  Hello, Normally we all do use using System.Linq; and using System.Data.Linq; for example on the code-behind and expect we can reach the members of these namespaces from Source Code like <%= Something.First()%> but when I wrote it, asp.net said it couldn't find First() in the context and I had to add <%@ Import Namespace="System.Linq" which looked very weird to me but it worked out. Since they are targeting at the same class why they both need separate namespace importing. Code-behind : using System; using System.Data.Linq; using System.Linq; using System.Text namespace Something { class Items : System.Web.UI { //... } } but also I need to add the same Linq namespace on the Html Source part <%@Import Namespace="System.Linq"%> Do I know something wrong or this is some kind of bug in asp.net. I thought when the page is compiling, asp.net combines these two classes and converts html source code into cs class and indicates the control in Control c= new Control(); hierarchy. Thanks in advance.

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• Hg: How to do a rebase like git's rebase

  - by jpswain09

  Hey guys, In Git I can do this: 1. Start working on new feature: $ git co -b newfeature-123 # (a local feature development branch) do a few commits (M, N, O) master A---B---C \ newfeature-123 M---N---O 2. Pull new changes from upstream master: $ git pull (master updated with ff-commits) master A---B---C---D---E---F \ newfeature-123 M---N---O 3. Rebase off master so that my new feature can be developed against the latest upstream changes: (from newfeature-123) $ git rebase master master A---B---C---D---E---F \ newfeature-123 M---N---O I want to know how to do the same thing in Mercurial, and I've scoured the web for an answer, but the best I could find was this: http://www.selenic.com/pipermail/mercurial/2007-June/013393.html That link provides 2 examples: 1. I'll admit that this: (replacing the revisions from the example with those from my own example) hg up -C F hg branch -f newfeature-123 hg transplant -a -b newfeature-123 is not too bad, except that it leaves behind the pre-rebase M-N-O as an unmerged head and creates 3 new commits M',N',O' that represent them branching off the updated mainline. Basically the problem is that I end up with this: master A---B---C---D---E---F \ \ newfeature-123 \ M'---N'---O' \ newfeature-123 M---N---O this is not good because it leaves behind local, unwanted commits that should be dropped. The other option from the same link is hg qimport -r M:O hg qpop -a hg up F hg branch newfeature-123 hg qpush -a hg qdel -r qbase:qtip and this does result in the desired graph: master A---B---C---D---E---F \ newfeature-123 M---N---O but these commands (all 6 of them!) seem so much more complicated than $ git rebase master I want to know if this is the only equivalent in Hg or if there is some other way available that is simple like Git. Thanks!! Jamie

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• Extension methods in class library project

  - by Mostafa

  I've implemented some extension methods and put those in separate Class Library project. Imagine I have a simple extension method like this in class library called MD.Utility: namespace MD.Utility { public static class ExtenMethods { public static bool IsValidEmailAddress(this string s) { Regex regex = new Regex(@"^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$"); return regex.IsMatch(s); } } } But nowhere in WebApp like App_code folder or WebFroms code-behind page I can't use this Extension method. If I do like this: using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using MD.Utility; public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { string email = "[email protected]"; if (email.IsValidEmailAddress()) { //To do } } } The compiler doesn't recognize IsValidEmailAddress() and even no intellisense support. While if I put my extension method in App_Code folder it's ok for using in another cs file in App_code Folder or Web Form code-behind pages.

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• How do you think while formulating Sql Queries. Is it an experience or a concept ?

  - by Shantanu Gupta

  I have been working on sql server and front end coding and have usually faced problem formulating queries. I do understand most of the concepts of sql that are needed in formulating queries but whenever some new functionality comes into the picture that can be dont using sql query, i do usually fails resolving them. I am very comfortable with select queries using joins and all such things but when it comes to DML operation i usually fails For every query that i never done before I usually finds uncomfortable with that while creating them. Whenever I goes for an interview I usually faces this problem. Is it their some concept behind approaching on formulating sql queries. Eg. I need to create an sql query such that A table contain single column having duplicate record. I need to remove duplicate records. I know i can find the solution to this query very easily on Googling, but I want to know how everyone comes to the desired result. Is it something like Practice Makes Man Perfect i.e. once you did it, next time you will be able to formulate or their is some logic or concept behind. I could have get my answer of solving above problem simply by posting it on stackoverflow and i would have been with an answer within 5 to 10 minutes but I want to know the reason. How do you work on any new kind of query. Is it a major contribution of experience or some an implementation of concepts. Whenever I learns some new thing in coding section I tries to utilize it wherever I can use it. But here scenario seems to be changed because might be i am lagging in some concepts.

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• Loading and binding a serialized view model to a WPF window?

  - by generalt

  Hello all. I'm writing a one-window UI for a simple ETL tool. The UI consists of the window, the code behind for the window, a view model for the window, and the business logic. I wanted to provide functionality to the users to save the state of the UI because the content of about 10-12 text boxes will be reused between sessions, but are specific to the user. I figured I could serialize the view model, which contains all the data from the textboxes, and this works fine, but I'm having trouble loading the information in the serialized XML file back into the text boxes. Constructor of window: public ETLWindow() { InitializeComponent(); _viewModel = new ViewModel(); this.DataContext = _viewModel; _viewModel.State = Constants.STATE_IDLE; Loaded += new RoutedEventHandler(MainWindow_Loaded); } XAML: <TextBox x:Name="targetDirectory" IsReadOnly="true" Text="{Binding TargetDatabaseDirectory, UpdateSourceTrigger=PropertyChanged}"/> ViewModel corresponding property: private string _targetDatabaseDirectory; [XmlElement()] public string TargetDatabaseDirectory { get { return _targetDatabaseDirectory; } set { _targetDatabaseDirectory = value; OnPropertyChanged(DataUtilities.General.Utilities.GetPropertyName(() => new ViewModel().TargetDatabaseDirectory)); } Load event in code behind: private void loadState_Click(object sender, RoutedEventArgs e) { string statePath = this.getFilePath(); _viewModel = ViewModel.LoadModel(statePath); } As you can guess, the LoadModel method deserializes the serialized file on the user's drive. I couldn't find much on the web regarding this issue. I know this probably has something to do with my bindings. Is there some way to refresh on the bindings on the XAML after I deserialize the view model? Or perhaps refresh all properties on the view model? Or am I completely insane thinking any of this could be done? Thanks.

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• Are we DELPHI, VCL or Pascal programmers?

  - by José Eduardo

  i´ve been a delphi database programmer since D2. Now i´m facing some digital imaging and 3D challenges that make me to start study OpenGL, DirectX, Color Spaces and so on. I´m really trying but nobody seems to use Delphi for this kind of stuff, just the good-old-paycheck Database programming. ok, i know that we have some very smart guys behind some clever components, some of this open-source. Is there any PhotoShop, Blender, Maya, Office, Sonar, StarCraft, Call of Dutty written in Delphi? Do i have to learn C++ to have access to zillions of books about that kind of stuff? What is the fuzz/hype behind this: int *varName = &anhoterThing? Why pointers seems to be the holy graal to this apps? I´ve downloaded MSVC++ Express and start to learn some WPF and QT integration, and i think: "Man, Delphi does this kind of stuff, with less code, less headaches, since the wheels were invented" This lead my mind to the following... Do you ever tried to write a simple notepad program using just notepad and dcc32 in Pascal/Delphi? if so embarcadero could make our beloved pascal compiler free, and sell just the ide, the vcl, the customer support ... and back to the question: Are we DELPHI, VCL or Pascal programmers?

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• checkbox like radiobutton wpf c#

  - by rockenpeace

  i have investigated this problem but this is solved in design view and code-behind. but my problem is little difference: i try to do this as only code-behind because my checkboxes are dynamically created according to database data.In other words, number of my checkboxes is not stable. i want to check only one checkbox in group of checkboxes. when i clicked one checkbox,i want that ischecked property of other checkboxes become false.this is same property in radiobuttons. i take my checkboxes from a stackpanel in xaml side: <StackPanel Margin="4" Orientation="Vertical" Grid.Row="1" Grid.Column="1" Name="companiesContainer"> </StackPanel> my xaml.cs: using (var c = new RSPDbContext()) { var q = (from v in c.Companies select v).ToList(); foreach (var na in q) { CheckBox ch = new CheckBox(); ch.Content = na.Name; ch.Tag = na; companiesContainer.Children.Add(ch); } } foreach (object i in companiesContainer.Children) { CheckBox chk = (CheckBox)i; chk.SetBinding(ToggleButton.IsCheckedProperty, "DataItem.IsChecked"); } how can i provide this property in checkboxes in xaml.cs ? thanks in advance..

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• Possible to Inspect Innards of Core C# Functionality

  - by Nick Babcock

  I was struck today, with the inclination to compare the innards of Buffer.BlockCopy and Array.CopyTo. I am curious to see if Array.CopyTo called Buffer.BlockCopy behind the scenes. There is no practical purpose behind this, I just want to further my understanding of the C# language and how it is implemented. Don't jump the gun and accuse me of micro-optimization, but you can accuse me of being curious! When I ran ILasm on mscorlib.dll I received this for Array.CopyTo .method public hidebysig newslot virtual final instance void CopyTo(class System.Array 'array', int32 index) cil managed { // Code size 0 (0x0) } // end of method Array::CopyTo and this for Buffer.BlockCopy .method public hidebysig static void BlockCopy(class System.Array src, int32 srcOffset, class System.Array dst, int32 dstOffset, int32 count) cil managed internalcall { .custom instance void System.Security.SecuritySafeCriticalAttribute::.ctor() = ( 01 00 00 00 ) } // end of method Buffer::BlockCopy Which, frankly, baffles me. I've never run ILasm on a dll/exe I didn't create. Does this mean that I won't be able to see how these functions are implemented? Searching around only revealed a stackoverflow question, which Marc Gravell said [Buffer.BlockCopy] is basically a wrapper over a raw mem-copy While insightful, it doesn't answer my question if Array.CopyTo calls Buffer.BlockCopy. I'm specifically interested in if I'm able to see how these two functions are implemented, and if I had future questions about the internals of C#, if it is possible for me to investigate it. Or am I out of luck?

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• strange syntax error in python, version 2.6 and 3.1

  - by flow

  this may not be an earth-shattering deficiency of python, but i still wonder about the rationale behind the following behavior: when i run source = """ print( 'helo' ) if __name__ == '__main__': print( 'yeah!' ) #""" print( compile( source, '<whatever>', 'exec' ) ) i get :: File "<whatever>", line 6 # ^ SyntaxError: invalid syntax i can avoid this exception by (1) deleting the trailing #; (2) deleting or outcommenting the if __name__ == '__main__':\n print( 'yeah!' ) lines; (3) add a newline to very end of the source. moreover, if i have the source end without a trailing newline right behind the print( 'yeah!' ), the source will also compile without error. i could also reproduce this behavior with python 2.6, so it’s not new to the 3k series. i find this error to be highly irritating, all the more since when i put above source inside a file and execute it directly or have it imported, no error will occur—which is the expected behavior. a # (hash) outside a string literal should always represent the start of a (possibly empty) comment in a python source; moreover, the presence or absence of a if __name__ == '__main__' clause should not change the interpretation of a soure on a syntactical level. can anyone reproduce the above problem, and/or comment on the phenomenon? cheers

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• Squid handling of concurrent cache misses

  - by Oliver H-H

  We're using a Squid cache to off-load traffic from our web servers, ie. it's setup as a reverse-proxy responding to inbound requests before they hit our web servers. When we get blitzed with concurrent requests for the same request that's not in the cache, Squid proxies all the requests through to our web ("origin") servers. For us, this behavior isn't ideal: our origin servers gets bogged down trying to fulfill N identical requests concurrently. Instead, we'd like the first request to proxy through to the origin server, the rest of the requests to queue at the Squid layer, and then all be fulfilled by Squid when the origin server has responded to that first request. Does anyone know how to configure Squid to do this? We've read through the documentation multiple times and thoroughly web-searched the topic, but can't figure out how to do it. We use Akamai too and, interestingly, this is its default behavior. (However, Akamai has so many nodes that we still see lots of concurrent requests in certain traffic spike scenarios, even with Akamai's super-node feature enabled.) This behavior is clearly configurable for some other caches, eg. the Ehcache documentation offers the option "Concurrent Cache Misses: A cache miss will cause the filter chain, upstream of the caching filter to be processed. To avoid threads requesting the same key to do useless duplicate work, these threads block behind the first thread." Some folks call this behavior a "blocking cache," since the subsequent concurrent requests block behind the first request until it's fulfilled or timed-out. Thx for looking over my noob question! Oliver

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• unable to implement HTTP Tunneling correctly in order to enable Java rmi calls over internet(and und

  - by Lokesh Kumar

  in my previous question :-How to Setup RMI Server under(NAT/ISP) Now,i m able to start my RMI server by Installing apache Tomcat 6.0 server. i have also installed servlet programs into apache Tomcat server in order to enable HTTP tunneling. my servlet codes:- (1) [SimplifiedServletHandler.java][2] (2) [ServletForwardCommand.java][3] these servlets resides inside :- C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\examples\WEB-INF\classes\ one more thing that i hv added to my CalcultorClient.java program:- try { RMISocketFactory. setSocketFactory(new sun.rmi.transport.proxy .RMIHttpToCGISocketFactory( )); }catch (IOException ignored) { System.out.println("Error :- ignored.getMessage()"); } But,when i try to make client connect with server(under ISP/NAT) i get the following Exception :- RemoteException java.rmi.UnmarshalException: Error unmarshaling return header; nested exception is: java.io.IOException: HTTP request failed i don't know the correct reason behind this Exception.. but,i think that i haven't installed or invoke my servlet programs properly on server side. so,can anybody tell me the correct reason behind this error/Exception????? and if u think that it is servlet problem then tell me the correct procedure to run my serlvet program inside tomcat server.

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• Are there scenarios where the ViewModel needs to invoke methods on the View w.r.t. MVVM in WPF?

  - by Gishu

  As per the pattern, the ViewModel exposes Properties(with change notification) and Commands (to notify the VM of user actions) that the View binds to. The only communication that flows from the VM to the View is the property change notifications (so that the View can refresh itself with updated data). In MVP or PresentationModel form of the pattern (if I'm not mistaken), the View implements a plain vanilla interface (consisting of methods, properties and/or events). With MVVM, it feels methods on the IView have been outlawed (along with IView itself). One scenario I could think of was to set the focus to a certain control in the View. (When the user does ActionX, the focus should immediately be set to FieldY). In MVP, I'd write this as IView.ActivateField(NameConstant), which the presenter or PM would invoke. In MVVM, this seems to be a fringe case that needs a workaround / little bit of code-behind. The VM implements an ActiveField Property, which it sets to NameConstant. The view picks up the change notification event and in a code-behind event handler, activates the Name control. Is the above just an exception to the norm? Or are there other such scenarios, where the VM needs to invoke a method on the View ?

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• calll html button onclick event from asp server side login authenticate event

  - by CraigJSte

  Need to programmatically click an html button from a login event (code behind? the html button sends variables to Flash using method: no response - with no postback and uses ExternalInterface API via javascript. Going from SWF ASPX is great, but need to send User.Identity to SWF from ASPX via javascript after authenticate with login event which am having impossible time getting to work... (calling HTML event from Login button) tried scripting in javascript to login event with no luck, possibly because postback clears SWF variables - so perhaps keeping separate (login then html send) would work... Here is my relevant code: function sendToActionScript(value) { swfobject.getObjectById("Property").sendToActionScript(value); } </script> <object ..// SWF File embedded> </object <form id="form1" runat="server"> <asp:Login id="login1" OnAuthenticate="login1_Authenticate"/> </form> <form id="form" onsubmit="return false;"> <input type="text" name="input" id="input" value="" runat="server" /> <button id="btnInput" runat="server" causesvalidation="false" visible="true" style="width: 51px" onclick="sendToActionScript(this.form.input.value);" >Send</button><br /> </form> // CODE BEHIND protected void Login1_Authenticate(object sender, AuthenticateEventArgs e) { // do something to get User Id and Role //bind the string (user or role) to input.value //then call the HTML button onclick event to send it to SWF file. //which I could put in separate function and call from Login_Authenticate } Can anyone help me I am out of ideas. Craig

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• Remove "Flash" between pages while using Internet Explorer modal boxes

  - by AaronS

  I have an internal web application, that is IE specific, and uses a lot of IE specific modal boxes: (window.showModalDialog). I recently received a request to remove the "flash" when navigating between pages of the site. To accomplish this, I just added a meta transition tag to my master page: <meta http-equiv="Page-Enter" content="blendTrans(duration=0.0)" /> This works perfectly except for the modal boxes. When you launch a modal box, and then move it around, the web page behind it keeps a trail of the modal box instead of re-drawing the web page content. This prevents the user from moving the modal box to read anything that was behind it. Is there a way to prevent the "flash" between pages in an IE specific site and have the site still work with modal boxes? Please note, this is a large and complex site, so re-architecting it to not use modal boxes isn't an option. This is an asp.net, c# web application, and all of my users are using IE 7 and IE 8 if it makes any difference. -Edit- To duplicate this, put the following into an html page, and open it in Internet Explorer: <html> <head> <title>Test</title> <meta content="blendTrans(duration=0.0)" http-equiv="Page-Exit"> </head> <body> <script language="javascript"> window.showModalDialog('modal.htm', window); </script> </body> </html>

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• Modal dialog focus problems on WPF application

  - by Donal

  Hi, I have a problem with my wpf application where a modal dialog will appear behind the main application causing it to hang. It is very inconsistent, where most of the time the pop-up works correctly and is shown in front but occasionally it will pop-up behind, which stops any interaction with it. I can still close the dialog using the taskbar if this happens. I have noticed that it generally occurs when lots of other applications are open and the taskbar is full. Also, I am working with two screens and the problem only occurs on the screen with the taskbar - very wierd! The dialog is a window control, which contains an injected usercontrol as it's data context. To set the owner of the window before calling ShowDialog(), the first active window in the application is used instead of Window.GetWindow(this): private static Window GetOwner() { if (Application.Current != null) { var owner = Application.Current.Windows.Cast().FirstOrDefault(w = w.IsActive); return owner ?? Application.Current.MainWindow; } return null; } Any ideas of what may be causing this problem? or even how to try and track it so I can gather more information when it happens? Thanks, Donal

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• How to estimate tomcat server requirements?

  - by Daniil

  We have a brand new webapp written that runs on Tomcat. So far, only one client is using it through the day. They run about 180 unique logins a day. Not really a lot IMO. Now, we managed to sell it to a brand new client who likes and wants to roll it out to 50,000 clients. How many of them will login at the same time - no idea. But I need to do the whole thing - allocate, create, config and maintain. OK - last is simple(errrr). The application runs off of Tomcat 5.5 on Gentoo (I'm thinking to upgrade to Tomcat 6) with MSSQL & mySQL behind. I do realize that a more enterprise ready application would be a better fit, but that's not an option at the moment. Since I've never done this before, I'm a bit lost. Can someone advice on how to go about estimating the equipment requirements for this client? Tomcat does have clustering, so that I can do. MS SQL - I'm sure they have something too. I'm thinking to stick it behind LVS (which we do use at the moment for something else too). Any help from people who deal with these details is greatly appreciated!

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