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  • What is the Action returned by the subscribe parameter of IObservable.Create actually for?

    - by James Hay
    The method definition of IObservable.Create is: public static IObservable<TSource> Create<TSource>( Func<IObserver<TSource>, Action> subscribe ) I get that the function is called once the observable is subscribed to, where by I can then call OnNext, OnError and OnComplete on the observer. But why do I need to return an Action from the subscibe parameter and when will it actually be called?

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  • Carbon, LSUIElement, and showing a window

    - by James Turner
    I have a Carbon LSUIElement application, which runs in the background (possibly with an icon in the menubar, depending on a pref) and occasionally needs to show a dialog to the user - sometimes in response to a user event, but sometimes in response to a background task failing or similar. (I'm using Qt 4.5, so the application is Carbon based; With Qt 4.6 things will be Cocoa based, but it sounds as if the problem may exist there too). The problem is that when I open a window, and show it, it doesn't get brought to the front. I assume this is an artefect of being an LSUIElement app. Qt uses SelectWindow in Carbon, and [makeKeyAndOrderFront] in Cocoa, to bring a window (and the app) to the front. To work around the problem, I tried going direct to the window server: (the first few steps are to get the WindowID, this will be simpler with Qt-Cocoa, since I can use NSWindow:nativeWindow) WindowRef ref = HIViewGetWindow((HIViewRef) aWidget->winId()); CGSWindow wid = GetNativeWindowFromWindowRef(ref); CGSConnection cid =_CGSDefaultConnection(); CGSOrderWindow(cid, wid, 1 /* above everything */, 0 /* NULL */); This works, sort of - the window comes to the front, but it's not highlighted or keyboard focused. Are there additional steps to fix those issues, or is there a simpler solution to the whole problem?

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  • How to initialize F# list when size is unknown, using while..do loop

    - by James Black
    I have a function that will parse the results of a DataReader, and I don't know how many items are returned, so I want to use a while..do loop to iterate over the reader, and the outcome should be a list of a certain type. (fun(reader) -> [ while reader.Read() do new CityType(Id=(reader.GetInt32 0), Name=(reader.GetString 1), StateName=(reader.GetString 2)) ]) This is what I tried, but the warning I get is: This expression should have type 'unit', but has type 'CityType'. Use 'ignore' to discard the result of the expression, or 'let' to bind the result to a name. So what is the best way to iterate over a DataReader and create a list?

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  • How can one prevent page breaks between Tables in SQL Reporting Services 2005?

    - by James
    I've been developing an SSRS 2005 report (a form letter) that contains two tables. The first "table" uses DataSet "A" to populate address fields on letterhead. The second table uses DataSet "B" to display a basic list of records that pertain to the addressed party. Even though the two tables are within the same page and all PageBreak* properties are set to "False", SSRS renders the report as two pages. How can I force both tables to render in series, without any forced page breaks?

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  • Scrum stories and behind the scenes features

    - by James P.
    As I understand things, the Scrum backlog is composed of a series of Stories that represent something for the end user and this is further decomposed into Features. If this is the case, where does all the behind the scenes features go that aren't really linked to a story but are still useful? For example, say I'm making an application that catalogs the contents of a hard drive. A story wouldn't require it but having an md5 hash on each file would be a nice feature.

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  • XML Parsing in Groovy strips attribute new lines

    - by Bill James
    I'm writing code where I retrieve XML from a web api, then parse that XML using Groovy. Unfortunately, it seems that both XmlParser and XmlSlurper for Groovy strip newline characters from the attributes of nodes when .text() is called. How can I get at the text of the attribute including the newlines? Sample code: def xmltest = ''' <snippet> <preSnippet att1="testatt1" code="This is line 1 This is line 2 This is line 3" > <lines count="10" /> </preSnippet> </snippet>''' def parsed = new XmlParser().parseText( xmltest ) println "Parsed" parsed.preSnippet.each { pre -> println pre.attribute('code'); } def slurped = new XmlSlurper().parseText( xmltest ) println "Slurped" slurped.children().each { preSnip -> println [email protected]() } the output of which is: Parsed This is line 1 This is line 2 This is line 3 Slurped This is line 1 This is line 2 This is line 3

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  • Reading value of cookie using curl in php

    - by james
    Hello, Im using Firefox 3.5.9. When i visit a url , it sets a cookie on my computer.I can see this cookie in Firefox by going to Tools-Options-Privacy,then clicking on 'Remove Individual Cookies'. There is a folder called xyz,which contains a cookie named JSessionId and which has some Content value . If i use curl in my php code to navigate to that website,is there a way i can read the Content value of that cookie programmatically ? . Some sample code would be really appreciated. Thank You

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  • Regex for Searching for Text Not Preceeded By a Specific String

    - by James
    Hi, I am working on a web site with several other developers and we have had problems where people commit JavaScript code with AJAX calls that use URL's relative to the site root. An example would be /Home/Index which will not work if the site is hosted in a virtual directory. To get round the problem we use a $.url() method to convert it to a full path, e.g. $("#container").load($.url("/Home/Index")) I am trying to write a unit test that will search each JavaScript file and find places where the $.url method is not being used. The only problem is that I cannot seem to write a regex expression to do this. I have tried the following: (?!\$\.url\()"(/\w*)+" But this does not work. I cannot find a way to say that I don't want the $.url in front. Does anyone know if this is possible? Note that I need regular expressions that are compatible with .NET Thanks.

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  • Reject (Hard 404) ASP.NET MVC-style URLs

    - by James D
    Hi, ASP.NET MVC web app that exposes "friendly" URLs: http://somesite.com/friendlyurl ...which are rewritten (not redirected) to ASP.NET MVC-style URLs under the hood: http://somesite.com/Controller/Action The user never actually sees any ASP.NET MVC style URLS. If he requests one, we hard 404 it. ASP.NET MVC is (in this app) an implementation detail, not a fundamental interface. My question: how do you examine an arbitrary incoming URL and determine whether or not that URL matches a defined ASP.NET MVC path? For extra credit: how do you do it from inside an ASP.NET-style IHttpModule, where you're getting invoked upstream from the ASP.NET MVC runtime? Thanks!

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  • Live streaming using Flash

    - by James
    Hi, I was working on an application that streams live video using Flash client and Wowza media server. As of now, I use an independent desktop based encoder(Flash Media Live Encoder) to publish my live stream. I wanted to know if it is possible to do the encoding part in the browser? My application would be a used by many to publish their streams so I cannot ask everyone to use FMLE to publish. I was wondering how do the other web based video chat applications do the encoding part over the web. Please help. Thanks

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  • How do you unpack gems using jruby on rails 2.3?

    - by James Moore
    I'm trying to unpack all the system gems to end up with a standalone Rails directory including all the rails gems and all the system gems. I'm starting with a bare rails setup; just did a jruby -S rails and a 'generate jdbc'. I then add a config.gem 'jdbc-mysql' to environment.rb and do the jruby -S rake gems:unpack:dependencies. After unpacking, if I do a rake I get: no such file to load -- jdbc-mysql Is there something else you need to do to get the jdbc gem unpacked? I'm using jruby 1.4.0 (and moving to 1.5 is on my todo list) and rails 2.3.8.

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  • While using ConcurrentQueue, trying to dequeue while looping through in parallel

    - by James Black
    I am using the parallel data structures in my .NET 4 application and I have a ConcurrentQueue that gets added to while I am processing through it. I want to do something like: personqueue.AsParallel().WithDegreeOfParallelism(20).ForAll(i => ... ); as I make database calls to save the data, so I am limiting the number of concurrent threads. But, I expect that the ForAll isn't going to dequeue, and I am concerned about just doing ForAll(i => { personqueue.personqueue.TryDequeue(...); ... }); as there is no guarantee that I am popping off the correct one. So, how can I iterate through the collection and dequeue, in a parallel fashion. Or, would it be better to use PLINQ to do this processing, in parallel?

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  • Android: Help with tabs view

    - by James
    So I'm trying to build a tabs view for an Android app, and for some reason I get a force close every time I try to run it on the emulator. When I run the examples, everything shows fine, so I went as far as to just about copy most of the layout from the examples(a mix of Tabs2.java and Tabs3.java), but for some reason it still wont run, any ideas? Here is my code(List1.class is a copy from the examples for testing purposes). It all compiles fine, just gets a force close the second it starts: package com.jvavrik.gcm; import android.app.TabActivity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.TabHost; import android.widget.TextView; public class GCM extends TabActivity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); final TabHost tabHost = getTabHost(); tabHost.addTab(tabHost.newTabSpec("tab1") .setIndicator("g", getResources().getDrawable(R.drawable.star_big_on)) .setContent(new Intent(this, List1.class))); tabHost.addTab(tabHost.newTabSpec("tab2") .setIndicator("C") .setContent(new Intent(this, List1.class)) ); tabHost.addTab(tabHost.newTabSpec("tab3") .setIndicator("S") .setContent(new Intent(this, List1.class)) ); tabHost.addTab(tabHost.newTabSpec("tab4") .setIndicator("A") .setContent(new Intent(this, List1.class)) ); } }

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  • Getting the Leftmost Bit

    - by James
    I have a 5 bit integer that I'm working with. Is there a native function in Objective-C that will let me know which bit is the leftmost? i.e. I have 01001, it would return 8 or the position. Thanks

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  • Is there a generic way of dealing with varying connection strings in C#?

    - by James Wiseman
    I have an application that needs to connect to a SQL database, and execute a SQL Agent Job. The connection string I am trying to access is stored in the registry, which is easily enough pulled out. This appliction is to be run on multiple computers, and I cannot guarantee the format of this connection string being consistent across these computers. Two that I have pulled out for example are: Data Source=Server1;Initial Catalog=DB1;Integrated Security=SSPI; Data Source=Server2;Initial Catalog=DB1;Provider=SQLNCLI.1;Integrated Security=SSPI;Auto Translate=False; I can use an object of type System.Data.SqlClient.SqlConnection to connect to the database with the first connection string, howevever, I get the following error when I pass the second to it: keyword not supported: 'provider' Similarly, I can use the an object of type System.Data.OleDb.OleDbConnection to connect to the database with the second connection string, howevever, I get the following error when I pass the first to it: An OLEDB Provider was not specified in the ConnectionString' I can solve this by scanning the string for 'Provider' and doing the connect conditionally, however I can't help but feel that there is a better way of doing this, and handle the connection strings in a more generic fashion. Does anyone have any suggestions?

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  • Retrieving top 50 rows from Table using LINQ

    - by James
    Hey, Am new to LINQ, and am trying to retrieve the top 50 rows of a particular table. In SQL Server using an actual query i coudl say "Select TOP 50 from Transactions" , but not sure how i need to do that with LinQ Any pointers that could help ? Thanks !

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  • jQuery validation with submit handler

    - by James
    I setup the form validation using jQuery validation plug-in's validate method and I have a submit handler that modifies the input element's value (I use YUI editor and it needs saveHTML() call to copy the iframe's content to the textarea element.). When submitting the form, I want the validator to validate the form after executing my submit handler. But it doesn't execute my submit handler if it is registered after the validate call. For example, <form id="form1" action="/test"> <input type="text" name="txt1" id="txt1" /> <input type="submit" value="submit" /> $(document).ready(function() { $("#form1").submit(function() { $("#txt1").val("123456"); }); $("#form1").validate({ rules: { txt1: { maxlength: 5 } } }); }); The form is validated after my submit handler so submit is canceled. $(document).ready(function() { $("#form1").validate({ rules: { txt1: { maxlength: 5 } } }); $("#form1").submit(function() { $("#txt1").val("123456"); }); }); However if I change the order the form is validated before my submit handler.

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  • Exception calling UpdateModel - Value cannot be null or empty

    - by James Alexander
    This is probably something silly I'm missing but I'm definitely lost. I'm using .NET 4 RC and VS 2010. This is also my first attempt to use UpdateModel in .NET 4, but every time I call it, I get an exception saying Value cannont be null or empty. I've got a simple ViewModel called LogOnModel: [MetadataType(typeof(LogOnModelMD))] public class LogOnModel { public string Username { get; set; } public string Password { get; set; } public class LogOnModelMD { [StringLength(3), Required] public object Username { get; set; } [StringLength(3), Required] public object Password { get; set; } } } My view uses the new strongly typed helpers in MVC2 to generate a textbox for username and one for the password. When I look at FormCollection in my controller method, I see values for both coming through. And last but not least, here's are post controller methods: // POST: /LogOn/ [HttpPost] public ActionResult Index(FormCollection form) { var lm = new LogOnModel(); UpdateModel(lm, form); var aservice = new AuthenticationService(); if (!aservice.AuthenticateLocal(lm.Username, lm.Password)) { ModelState.AddModelError("User", "The username or password submitted is invalid, please try again."); return View(lm); } return Redirect("~/Home"); } Can someone please lend some insight into why UpdateModel would be throwing this exception? Thanks!

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  • How to give a no-Administrator user rights to manage IIS?

    - by James Weng
    The organization policy does not allow normal users be assigned to Administrators group of some Windows Server. But some of them need rights to manage the IIS service of these server via RDP. What kind of permission should I give to these users to let them could manage IIS without add them to Administrators group? All these servers are not in Domain.

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  • Nested Select in Rails

    - by James
    I am working on a Rails application which uses categories for items. My category model is self-joined so that categories can be nested: class Category < ActiveRecord::Base has_many :items # Self Join (categories can have subcategories) has_many :subcategories, :class_name => "Category", :foreign_key => "parent_id" belongs_to :parent, :class_name => "Category" ... end I have a form which allows a user to create an item which currently lists all categories in a select, but they are all listed together: <%= f.label :category_id %> <%= select :item, :category_id, Category.all.collect {|c| [ c.title, c.id ]} %> So the select looks something like this: Category1 Category2 Category3BelongsTo2 Category4BelongsTo1 But what I want is: Category1 - Category4BelongsTo1 Category2 - Category3BelongsTo2 Is there a helper for this (which would be awesome!)? If not, how could I accomplish this? Thanks!

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  • Writing a new line to file in PHP

    - by James P
    My code: $i = 0; $file = fopen('ids.txt', 'w'); foreach ($gemList as $gem) { fwrite($file, $gem->getAttribute('id') . '\n'); $gemIDs[$i] = $gem->getAttribute('id'); $i++; } fclose($file); For some reason, it's writing \n as a string, so the file looks like this: 40119\n40122\n40120\n42155\n36925\n45881\n42145\n45880 From Google'ing it tells me to use \r\n, but \r is a carriage return which doesn't seem to be what I want to do. I just want the file to look like this: 40119 40122 40120 42155 36925 45881 42145 45880 Thanks.

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