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Articles indexed Thursday December 30 2010

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• Will learning to use Fedora also teach me my way around Redhat (CentOS)?

  - by Matt Untsaiyi

  I want to dive into the open source world and start using a Linux distro while learning to program. I've looked over the options and it pretty much boils down to Fedora or CentOS. The reasoning behind it is I'm hoping to kill two birds with one stone... Redhat seems to be "the choice" for servers, so I figure as I learn to program, I can also learn my way around Linux... or Redhat more specifically... and get that under my belt too. I want to use Fedora, and be on the frontier of new software (since I'm not doing anything critical), but if it's completely different than Redhat I'd rather just use CentOS. So is it? Or can I use one and know the other?

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• Concatenate two mp4 videos into one file

  - by Jer

  I recently ripped my DVD collection to play them on my media center PC, and several of them are two-disc movies (i.e. The Lord of the Rings). Since I ripped each DVD individually, that gives me two video files for some movies. I am using Ubuntu Linux - how can I concatenate these two MP4/H.264 videos into a single MP4 video file? Preferably from the command line, and without re-encoding everything during the process (although I can try figuring out a video editor like Pitivi if that's the only solution.)

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• Excel formula - sometimes array formula, sometimes not

  - by Jonas

  I want to write some data to an Excel file, and I want the first page to show a summary of the data that are spread all over the sheets. The individual data items on a sheet can be included or excluded, and I want the summary to be calculated only on the included values. Thus, I thought I'd use a formula like this to show, for example, an average (for which empty fields shouldn't be counted, either): =AVERAGE(IF('dataSheet1'!$B:$B=1,IF('dataSheet1'!$I:$I<>"",'dataSheet1'!$I:$I,""),"")) If I have this formula in dataSheet1, everything works fine. If I have this formula in the summary sheet, I need to enter it as an array formula, and I have to specify the exact ranges to make it work. Is there a way (aside from adding the average in dataSheet, and then referencing the result in summary) to make the formula work without having it turn into an array formula?

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• How to query a DHCP server to get the local DNS serves

  - by Dan Berlyoung

  I have a ClarkConnect (CentOS based) box running as my home router on a RR connection. I had the DNS servers set up to use Google's DNS server. I want to change them back to the local DNS servers but I can't find an obvious/easy way to get those address short of a)reconfiguring the router's network to DHCP them (would rather not interrupt everyone) or b)calling their T/S (kill me now!). Is there a command line tool/command I can use to query the DHCP server on the external NIC to see what DNS servers it would set me up with w/o munging my existing setup?

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• Auto switching between wired and wireless connections

  - by Joe

  How about this situation. Our business deals a lot with medical information. And some of our clients have demands based off HIPPA, etc. There is one now where they do not want an employee to have both wired and wireless on at same time. If the wireless is on the wired needs to be turned off automatically and vice versa. However, this can not be up to the end user to manage! I have looked for third party applications and only have found http://www.wirelessautoswitch.com Does anyone know of anything else that is out there? Or possible something that can be done via group policy, etc.?

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• Make Chrome always open PDFs itself

  - by jdm

  Hi, I'm looking for a way to make Google Chrome always open PDFs with its internal viewer when I click a link, as opposed to downloading it to the default location. It works with most URLs, but some servers set a special header to force the file to be downloaded ("Content-Disposition: attachment;", e.g. http://www.uni-goettingen.de/en/46260.html). What I want is the opposite of this question: Stop PDFs from displaying inside Google Chrome, or what is asked for here, but applied to Chrome: How to ignore “Content-Disposition: attachment” in Firefox Btw., I'm running Chrome 8.0.552.0 dev on Ubuntu 10.4.

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• Spécial Rétrospective 2010 sur Développez : quels événements IT vous ont le plus marqué cette année ?

  Spécial Rétro 2010 Quels événements IT vous ont le plus marqué cette année ? En collaboration avec Idelways Cloud computing, mobiles, réseaux sociaux, HTML5, Wikileaks... l'année 2010 touche à sa fin et force est de constater qu'elle fut riche en rebondissements dans le domaine du développement et dans l'IT d'une manière générale. Cette année a tout particulièrement été marquée par le retour fracassant d'Oracle sur le devant de la scène médiatique. Rachats, poursuites judiciaires, forks, déclarations assassines, abandons et lancement de produits... bref, Oracle était partout en 2010. Tout a vraiment commencé après la

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• Vers le premier réseau de Command and Control sur Android ? Un Trojan chinois avec des capacités de botnet repéré

  Vers le premier réseau de Command and Control sur Android ? Un malware chinois ayant des capacités de botnet repéré par Lookout Mobile Security Un malware chinois touchant le système d'exploitation mobile Android vient d'être découvert. Le trojan, baptisé « Geinimi »,transmet les données recueillies sur les téléphones des utilisateurs à un serveur distant. D'après l'éditeur de sécurité Lookout Mobile Security, Geinimi serait le malware le plus sophistiqué touchant l'OS de Google. C'est en effet la première fois qu'un malware sur Android affiche des capacités semblable à celles d'un botnet. Actuellement le trojan est distribué en étant greffé sur des versions ...

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• Quel est le bogue le plus récalcitrant que vous ayez rencontré ? Improbable ou impossible à reproduire, racontez-nous tout

  Quel est le bug le plus récalcitrant que vous ayez rencontré ? Improbable ou impossible à reproduire, racontez-nous votre meilleure histoire de débogage Si le débogage est l'art d'enlever les bogues, la programmation doit être l'art de les créer. Une expression chère à beaucoup de développeurs qui souligne à quel point le débogage d'une application peut être important et... problématique. C'est ce que relate Patrick Thomson, un développeur blogueur qui raconte ce qu'il qualifie de "meilleure histoire de débogage qu'il ait jamais entendue". Il s'agit d'une mésaventure vécue dans les année 80 par le père de l'auteur, avec un ordinateur ancestrale ut...

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• How do you manage the testing of your Android software on physical devices?

  - by Philip Regan

  I'm in charge of managing mobile application development at my company, and I am currently building a mobile device "library" for testing. Essentially, we want to have a representative device in-house for each of the OSes we are developing for, currently iOS (iPhone-only), Blackberry, and Android. Simulators only go so far, but I'm placing into the process a step to test software on the devices themselves. The problem we're finding is with Android. I don't think any of us here ever really understood just how fragmented the whole platform is until we started looking at devices to acquire. We are going to wait until v2.3 of Android is released, but which products to choose? Do we go by the most popular by market share? Do we get a small range of products by specs from least to most powerful overall? We're trying to avoid having to manage a dozen different devices to test each app, if not because of cost if only for the repeated time sink. How do you manage the testing of your Android software on physical devices?

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• Why does it take so long to finalize the HTML 5 spec?

  - by EpsilonVector

  I was reading this and one sentence caught my eye (emphasis mine): So Ian Hickson, XHTML’s biggest critic, fathered HTML 5, an action-oriented toddler specification that won’t reach adulthood until 2022, although some of it can be used today. Is that true? Is that really the HTML 5 development cycle? Why is it taking so long? What makes it so difficult to get right that it won't be final until 11 years from now?

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• GRE subject Computer science

  - by Maddy.Shik

  How do I prepare for the GRE Computer Science subject test? Are there any standard text books I should follow? Agree that its under graduation level and one doesn't need to dig to deep for it. I have done my computer engineering from a college who ranks in top 20 in India. So may be my curriculum has not been that good as compared to international students. Since now i want to get admission in to world renowned university's Ph. D. program. I want to enhance my basic skills up to a level to beat other international students in competition. I want to know good book references which are recommended by professors in international school like CMU, MIT, Standford etc. Like for Algorithms Coreman is considered very good. Good books builds concepts from very basic so that one doesn't need to mug up even a basic concepts. Coreman is just too good with good blend of Mathematics and programming concepts. Definitely Test paper are must but that can be practiced once one has read text books thoroughly. Besides its been 2 years i passed out from college so its is essential for me to revise all concepts from text books. Please tell me standard text books for each subject like Computer Architecture, Database Design, Operating Systems, Discrete Maths etc.

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• design pattern for unit testing?

  - by Maddy.Shik

  I am beginner in developing test cases, and want to follow good patterns for developing test cases rather than following some person or company's specific ideas. Some people don't make test cases and just develop the way their senior have done in their projects. I am facing lot problems like object dependencies (when want to test method which persist A object i have to first persist B object since A is child of B). Please suggest some good books or sites preferably for learning design pattern for unit test cases. Or reference to some good source code or some discussion for Dos and Donts will do wonder. So that i can avoid doing mistakes be learning from experience of others.

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• Using idle time in turn-based (RPG) games for updating

  - by The Communist Duck

  If you take any turn based RPG game there will be large periods of time when nothing is happening because the game is looping over 'wait_for_player_input'. Naturally it seems sensible to use this time to update things. However, this immediately seems to suggest that it would need to be threaded. Is this sort of design possible in a single thread? loop: if not check_something_pressed: update_a_very_small_amount else keep going But if we says 'a_very_small_amount' is only updating a single object each loop, it's going to be very slow at updating. How would you go about this, preferably in a single thread? EDIT: I've tagged this language-agnostic as that seems the sensible thing, though anything more specific to Python would be great. ;-)

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• Putting together CSV Cells in Excel with a macro

  - by Eric Kinch

  So, I have a macro to export data into CSV format and it's working great (Code at the bottom). The problem is the data I am putting into it. When I put the data in question in it comes out Firstname,Lastname,username,password,description I'd like to change it so I get Firstname Lastname,Firstname,Lastname,username,password,description What I'd like to do is manipulate my existing macro so to accomplish this. I'm not so good at VBS so any input or a shove in the right direction would be fantastic. Thanks! Sub Make_CSV() Dim sFile As String Dim sPath As String Dim sLine As String Dim r As Integer Dim c As Integer r = 1 'Starting row of data sPath = "C:\CSVout\" sFile = "MyText_" & Format(Now, "YYYYMMDD_HHMMSS") & ".CSV" Close #1 Open sPath & sFile For Output As #1 Do Until IsEmpty(Range("A" & r)) 'You can also Do Until r = 17 (get the first 16 cells) sLine = "" c = 1 Do Until IsEmpty(Cells(1, c)) 'Number of Columns - You could use a FOR / NEXT loop instead sLine = sLine & """" & Replace(Cells(r, c), ";", ":") & """" & "," c = c + 1 Loop Print #1, Left(sLine, Len(sLine) - 1) 'Remove the trailing comma r = r + 1 Loop Close #1 End Sub

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• Are there predifined styles for making arrow buttons in windows phone 7?

  - by Micah

  I want to make some buttons in my app that look like the common round buttons with the arrows found all over the win 7 apps. Anyone know where I can find resources for these? UPDATE Here's a great tutorial on creating round buttons in WP7. This is exactly what I was trying to do, but I will use the images mentioned by John Gardner below: http://blogs.msdn.com/b/priozersk/archive/2010/08/13/creating-round-button-for-wp7-part-1.aspx http://blogs.msdn.com/b/priozersk/archive/2010/08/14/creating-round-image-button-for-wp7-part-1.aspx Thakns!

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• Windows Phone 7 applications - Orientation Change

  - by Peter Perhác

  Hello there fellow developers! I am working on a Windows Phone 7 app and I can't figure out what I believe is a simple problem for the more seasoned ones. Say I have a layout consisting of two elements: a ListBox (filled with an abundance of items) and a TextBlock (providing the user with some basic instructions). I want these to be one above the other when the device is in Portrait orientation and I want these to be next to each other when the device orientation changes to Landscape. For the Portrait orientation I am using a Grid layout manager, as it lets me define the rows' heights like so... row 0 Height="2*", row 1 Height="*" Listbox sits in row 0, TextBlock in row 1. Now, what would be really neat is to simple change the RowDefinitions into ColumnDefinitions and reassign the listbox/textblock to the grid's columns instead of rows for when the device switches into Landscape. But that's just my idea. I don't know how to get this done elegantly. Maybe there's a better approach to this? Or maybe this is the correct approach and there is some method built for exactly this purpose? Thank you for your suggestions!

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• In Android how to get CheckBox onCheckedChanged from other activity

  - by user538837

  hi im using this, the first one - 16.1 Example A Preferences (sorry for the link) Cant for the love of android not get this to work I want to click that CheckBox witch is connected to the autosave PreferenceActivity and at the same time clicking it I want to fire an event to a method in the Activity that started the PreferenceActivity. There i will start a service. `` Sigh hope you understand the probl.

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• Doctrine generate models - problem with relation type

  - by mrok

  I am trying generate doctrine models from yaml schema I have schema like that: Product: columns: id: type: integer(5) primary: true unsigned: true autoincrement: true activation_time: type: datetime notnull: true enduser_id: type: integer(5) unsigned: true notnull: true relations: Enduser: foreignType: one type: one foreignAlias: Product Hostid: columns: id: type: integer(5) primary: true unsigned: true autoincrement: true value: type: string(32) fixed: true notnull: true Order: columns: id: type: integer(5) primary: true autoincrement: true unsigned: true expire_date: type: datetime description: type: clob Enduser: columns: id: type: integer(5) primary: true unsigned: true autoincrement: true hostid_id: type: integer(5) unsigned: true notnull: true order_id: type: integer(5) unsigned: true notnull: true relations: Order: foreignAlias: Endusers Hostid: foreignAlias: Endusers and the problem is that models generated by doctrine generate-models-yaml are wrong in BaseEnduser $Product is defined as Doctrine_Collection $this-hasMany('Product', array( 'local' = 'id', 'foreign' = 'enduser_id')); instead just Product object what did I wrong? relation is defined as foreignType: one type: one

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• Are ternary operators not valid for linq-to-sql queries?

  - by KallDrexx

  I am trying to display a nullable date time in my JSON response. In my MVC Controller I am running the following query: var requests = (from r in _context.TestRequests where r.scheduled_time == null && r.TestRequestRuns.Count > 0 select new { id = r.id, name = r.name, start = DateAndTimeDisplayString(r.TestRequestRuns.First().start_dt), end = r.TestRequestRuns.First().end_dt.HasValue ? DateAndTimeDisplayString(r.TestRequestRuns.First().end_dt.Value) : string.Empty }); When I run requests.ToArray() I get the following exception: Could not translate expression ' Table(TestRequest) .Where(r => ((r.scheduled_time == null) AndAlso (r.TestRequestRuns.Count > 0))) .Select(r => new <>f__AnonymousType18`4(id = r.id, name = r.name, start = value(QAWebTools.Controllers.TestRequestsController). DateAndTimeDisplayString(r.TestRequestRuns.First().start_dt), end = IIF(r.TestRequestRuns.First().end_dt.HasValue, value(QAWebTools.Controllers.TestRequestsController). DateAndTimeDisplayString(r.TestRequestRuns.First().end_dt.Value), Invoke(value(System.Func`1[System.String])))))' into SQL and could not treat it as a local expression. If I comment out the end = line, everything seems to run correctly, so it doesn't seem to be the use of my local DateAndTimeDisplayString method, so the only thing I can think of is Linq to Sql doesn't like Ternary operators? I think I've used ternary operators before, but I can't remember if I did it in this code base or another code base (that uses EF4 instead of L2S). Is this true, or am I missing some other issue?

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• How to implement Pentago AI algorithm

  - by itsho

  Hi, i'm trying to develop Pentago-game in c#. right now i'm having 2 players mode which working just fine. the problem is, that i want One player mode (against computer), but unfortunately, all implements of minimax / negamax are for one step calculated. butin Pentago, every player need to do two things (place marble, and rotate one of the inner-boards) I didn't figure out how to implement both rotate part & placing the marble, and i would love someone to guide me with this. if you're not familiar with the game, here's a link to the game. if anyone want's, i can upload my code somewhere if that's relevant. thank you very much in advance

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• iPad: Displaying UIActionSheet with UIPickerView as subview

  - by E-Madd

  I'm in the process of migrating an iPhone app to a universal app. On one of my views, I present a UIActionSheet with a UIPickerView as a subview. On the iPhone this always worked just fine. Of course, on the iPad I had to change a little to present the ActionSheet in a popover control. Here's some psuedo-code to outline where I'm at... actionSheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil]; pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0,44,0,0)]; pickerView.delegate = self; pickerView.dataSource = self; pickerView.showsSelectionIndicator = YES; [actionSheet addSubview:pickerView]; if (UI_USER_INTERFACE_IDIOM() != UIUserInterfaceIdiomPad){ [actionSheet showInView:self.view]; [actionSheet setBounds:actRect]; }else{ [actionSheet showFromRect:buttonRect inView:[UIApplication sharedApplication].keyWindow animated:YES]; } The resulting popover on the iPad is very small and only the very top of the UIPickerView is visible. How can I set the size of the popover?

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• Any good GUI tool to easily create stored procs SQL server 2008 ?

  - by Munish Goyal

  The templates for stored-procs in SSMS do not auto-populate all input columns, again there is manual work involved. I am looking for something like right-click on table and say CREATE stored-proc, and then it allows to pick a template, based on which it can populate the parameters etc. and give check-box in GUI (like table designer, you can easily add/remove a column). Some support for change management with table undergoing alter or otherwise would also be helpful. Currently we manually write all stored-procs, which i think we should be able to save time and labor with automation. Any suggestion on other free 3rd party tools ?

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• Right-aligning button in a grid with possibly no content - stretch grid to always fill the page

  - by Peter Perhác

  Hello people, I am losing my patience with this. I am working on a Windows Phone 7 application and I can't figure out what layout manager to use to achieve the following: Basically, when I use a Grid as the layout root, I can't make the grid to stretch to the size of the phone application page. When the main content area is full, all is well and the button sits where I want it to sit. However, in case the page content is very short, the grid is only as wide as to accommodate its content and then the button (which I am desperate to keep near the right edge of the screen) moves away from the right edge. If I replace the grid and use a vertically oriented stack panel for the layout root, the button sits where I want it but then the content area is capable of growing beyond the bottom edge. So, when I place a listbox full of items into the main content area, it doesn't adjust its height to be completely in view, but the majority of items in that listbox are just rendered below the bottom edge of the display area. I have tried using a third-party DockPanel layout manager and then docked the button in it's top section and set the button's HorizontalAlignment="Right" but the result was the same as with the grid, it also shrinks in size when there isn't enough content in the content area (or when title is short). How do I do this then? ==EDIT== I tried WPCoder's XAML, only I replaced the dummy text box with what I would have in a real page (stackpanel) and placed a listbox into the ContentPanel grid. I noticed that what I had before and what WPCoder is suggesting is very similar. Here's my current XAML and the page still doesn't grow to fit the width of the page and I get identical results to what I had before: <phone:PhoneApplicationPage x:Name="categoriesPage" x:Class="CatalogueBrowser.CategoriesPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone" xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" FontFamily="{StaticResource PhoneFontFamilyNormal}" FontSize="{StaticResource PhoneFontSizeNormal}" Foreground="{StaticResource PhoneForegroundBrush}" SupportedOrientations="PortraitOrLandscape" Orientation="Portrait" mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768" xmlns:ctrls="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Toolkit" shell:SystemTray.IsVisible="True"> <Grid x:Name="LayoutRoot" Background="Transparent"> <Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition Height="*"/> </Grid.RowDefinitions> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="*" /> <ColumnDefinition Width="Auto" /> </Grid.ColumnDefinitions> <StackPanel Orientation="Horizontal" VerticalAlignment="Center" > <TextBlock Text="Browsing:" Margin="10,10" Style="{StaticResource PhoneTextTitle3Style}" /> <TextBlock x:Name="ListTitle" Text="{Binding DisplayName}" Margin="0,10" Style="{StaticResource PhoneTextTitle3Style}" /> </StackPanel> <Button Grid.Column="1" x:Name="btnRefineSearch" Content="Refine Search" Style="{StaticResource buttonBarStyle}" FontSize="14" /> </Grid> <Grid x:Name="ContentPanel" Grid.Row="1"> <ListBox x:Name="CategoryList" ItemsSource="{Binding Categories}" Style="{StaticResource CatalogueList}" SelectionChanged="CategoryList_SelectionChanged"/> </Grid> </Grid> </phone:PhoneApplicationPage> This is what the page with the above XAML markup looks like in the emulator:

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• getElementById does return null

  - by pbcoder

  I have following function: $('canvas').createWindow('xyz', 500, 600); And js-code behind is: var $ = function(element) { if (this.constructor !== $) { return new $(element); } alert(element); var windowObj = document.getElementById(element); this.createWindow = function(src, width, height) { if(width != "" && height != "") { windowWidth = windowObj.style.width = width + 'px'; windowHeight = windowObj.style.height = height + 'px'; } }; }; But the problem is that JS says windowObj is null, alert(element) works fine! Thanks for your help!

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