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  • Violation of primary key constraint, multiple users

    - by MC.
    Lets say UserA and UserB both have an application open and are working with the same type of data. UserA inserts a record into the table with value 10 (PrimaryKey='A'), UserB does not currently see the value UserA entered and attempts to insert a new value of 20 (PrimaryKey='A'). What I wanted in this situation was a DBConcurrencyException, but instead what I have is a primary key violation. I understand why, but I have no idea how to resolve this. What is a good practice to deal with such a circumstance? I do not want to merge before updating the database because I want an error to inform the user that multiple users updated this data.

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  • Tools for displaying text, powerpoint style, in linux

    - by Will Mc
    I have a problem where I need a way to display a repeating series of "images" on a computer monitor. Specifically, given a series of text files, I'd like a way to display the contents of said files on a screen in a way much like a powerpoint would. My current thoughts are to find some tool that will take in a text file of some format, and then output an image which contains the text from the file. Then I'd put it in a directory and have some Slideshow program continuously go between the images in that directory. It's a very hacky solution, obviously. So, does anyone know of tools that would do such a thing? Or is there a better way to do this? I've looked into the library libgd2, but it doesn't seem to support text-wrapping for images, which is something I'd need. Thanks!

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  • ASP.NET WebAPI Security 2: Identity Architecture

    - by Your DisplayName here!
    Pedro has beaten me to the punch with a detailed post (and diagram) about the WebAPI hosting architecture. So go read his post first, then come back so we can have a closer look at what that means for security. The first important takeaway is that WebAPI is hosting independent-  currently it ships with two host integration implementations – one for ASP.NET (aka web host) and WCF (aka self host). Pedro nicely shows the integration into the web host. Self hosting is not done yet so we will mainly focus on the web hosting case and I will point out security related differences when they exist. The interesting part for security (amongst other things of course) is the HttpControllerHandler (see Pedro’s diagram) – this is where the host specific representation of an HTTP request gets converted to the WebAPI abstraction (called HttpRequestMessage). The ConvertRequest method does the following: Create a new HttpRequestMessage. Copy URI, method and headers from the HttpContext. Copies HttpContext.User to the Properties<string, object> dictionary on the HttpRequestMessage. The key used for that can be found on HttpPropertyKeys.UserPrincipalKey (which resolves to “MS_UserPrincipal”). So the consequence is that WebAPI receives whatever IPrincipal has been set by the ASP.NET pipeline (in the web hosting case). Common questions are: Are there situations where is property does not get set? Not in ASP.NET – the DefaultAuthenticationModule in the HTTP pipeline makes sure HttpContext.User (and Thread.CurrentPrincipal – more on that later) are always set. Either to some authenticated user – or to an anonymous principal. This may be different in other hosting environments (again more on that later). Why so generic? Keep in mind that WebAPI is hosting independent and may run on a host that materializes identity completely different compared to ASP.NET (or .NET in general). This gives them a way to evolve the system in the future. How does WebAPI code retrieve the current client identity? HttpRequestMessage has an extension method called GetUserPrincipal() which returns the property as an IPrincipal. A quick look at self hosting shows that the moral equivalent of HttpControllerHandler.ConvertRequest() is HttpSelfHostServer.ProcessRequestContext(). Here the principal property gets only set when the host is configured for Windows authentication (inconsisteny). Do I like that? Well – yes and no. Here are my thoughts: I like that it is very straightforward to let WebAPI inherit the client identity context of the host. This might not always be what you want – think of an ASP.NET app that consists of UI and APIs – the UI might use Forms authentication, the APIs token based authentication. So it would be good if the two parts would live in a separate security world. It makes total sense to have this generic hand off point for identity between the host and WebAPI. It also makes total sense for WebAPI plumbing code (especially handlers) to use the WebAPI specific identity abstraction. But – c’mon we are running on .NET. And the way .NET represents identity is via IPrincipal/IIdentity. That’s what every .NET developer on this planet is used to. So I would like to see a User property of type IPrincipal on ApiController. I don’t like the fact that Thread.CurrentPrincipal is not populated. T.CP is a well established pattern as a one stop shop to retrieve client identity on .NET.  That makes a lot of sense – even if the name is misleading at best. There might be existing library code you want to call from WebAPI that makes use of T.CP (e.g. PrincipalPermission, or a simple .Name or .IsInRole()). Having the client identity as an ambient property is useful for code that does not have access to the current HTTP request (for calling GetUserPrincipal()). I don’t like the fact that that the client identity conversion from host to WebAPI is inconsistent. This makes writing security plumbing code harder. I think the logic should always be: If the host has a client identity representation, copy it. If not, set an anonymous principal on the request message. Btw – please don’t annoy me with the “but T.CP is static, and static is bad for testing” chant. T.CP is a getter/setter and, in fact I find it beneficial to be able to set different security contexts in unit tests before calling in some logic. And, in case you have wondered – T.CP is indeed thread static (and the name comes from a time where a logical operation was bound to a thread – which is not true anymore). But all thread creation APIs in .NET actually copy T.CP to the new thread they create. This is the case since .NET 2.0 and is certainly an improvement compared to how Win32 does things. So to sum it up: The host plumbing copies the host client identity to WebAPI (this is not perfect yet, but will surely be improved). or in other words: The current WebAPI bits don’t ship with any authentication plumbing, but solely use whatever authentication (and thus client identity) is set up by the host. WebAPI developers can retrieve the client identity from the HttpRequestMessage. Hopefully my proposed changes around T.CP and the User property on ApiController will be added. In the next post, I will detail how to add WebAPI specific authentication support, e.g. for Basic Authentication and tokens. This includes integrating the notion of claims based identity. After that we will look at the built-in authorization bits and how to improve them as well. Stay tuned.

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  • How do I create a customized keyboard layout for Windows?

    - by Pedro Palhoto
    On Linux you can create any layout you wish by editing the appropriate ASCII configuration files. On Windows the keyboard layout definitions are binary. Is there any tool that can create these binary keyboard layout configuration files? I grew up on the Macintosh international keyboard layout, which used the option key extensively, and now I would like to use the same layout on Windows. On Linux this Mac international keyboard layout exists for both the console as well as for X.Org. On Windows, the most similar layout is US International, which is not the same.

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  • Ubuntu bash command

    - by pedro
    List in long form files in the directory "/ etc" for the file "ETCDIR" and view them, while the monitor sequential manner. how i can do it? with commands tee and more

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  • Security in shared hosting vs VPS 'virtual appliances'

    - by Pedro Loureiro
    I have to change my hosting provider. Right now I have a shared hosting account but I'm considering trying the LAMP stack appliance from turnkeylinux.org. I'm very comfortable with using linux, I've been using it for a long time. I have no problem ssh'ing into remote machines and do whatever I have to do (coding, reading logs, moving files, deploying, etc). The problem is that none of those tasks have involved securing the server/firewall. My experience has been as a desktop user or developer deploying apps/files in remote servers. Ignoring the security in the application logic (read: any scripts, frameworks, websites I might have created or installed) - I'm worried about things like base configuration of deamons, firewall, ports, executable scripts being readable from the outside and whatnot. My question is: how do you compare the (expected) out of the box security of the LAMP stack from turnkey and the (expected) security of a "regular" shared hosting provider? I was hoping to find some guides with a list of steps to do to protect my server but the only documentation I found was simply referring to ubuntu's documentation.

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  • split command on Ubuntu command-line

    - by pedro
    I want to split a file into multiple files with at most 25 lines each. I'm using this: split -l 25 /etc/adduser.conf > /home/ubuntu/PL/trab3/rc_ But I do not get the files I expect. How can I get files with filenames like rc_01, rc_02, etc.?

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  • Redirect local service to custom proxy

    - by Pedro Laguna
    Hello, I'm trying to create a custom proxy program but I have a problem. My program connects to a fixed port from a random port and I need to tunnel all this traffic by my local proxy. I think the solution is using iptables, but all the topics I found are related to redirect incoming connections, not outbounds. How can I redirect all the traffic from a local port to another local port and later to the internet? Thanks,

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  • split shell command ubuntu

    - by pedro
    Hi...i wanna split the file adduser.conf with 25 line to a file that start with rc_01, rc_02, etc I'm using this: split -l 25 /etc/adduser.conf /home/ubuntu/PL/trab3/rc_ but don't work what is wrong?

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  • Ubuntu bash command

    - by pedro
    Hello i want to show the number of lines, words and characters of all configuration files "/ Etc / * conf" (command "wc"). How can i modify the command to not view the messages error.

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  • split shell command

    - by pedro
    I want split a file into multiple files with at most 25 lines each. I'm using this: split -l 25 /etc/adduser.conf /home/ubuntu/PL/trab3/rc_ But I do not get the files I expect. How can files with the filenames like rc_01, rc_02, etc.?

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  • SendMail not working in CentOs 6.4

    - by Kane
    I am trying to send e-mails from my CentOS 6.4 but it does not work. My knowledge about servers is quite limited, so I hope someone can help me. Here is what I did: First i tried to send an email using the "mail" command, but it was not in the OS so I installed it. # yum install mailx After that, I tried sending an email using the "mail" command, but it did not send anything. I checked it on the internet and I realized I needed an e-mail server like sendmail, so I installed it. # yum install sendmail sendmail-cf sendmail-doc sendmail-devel After that, I configured it following some tutorials. First, sendmail.mc file. # vi /etc/mail/sendmail.mc Commented out the next line: BEFORE # DAEMON_OPTIONS('Port=smtp, Name=MTA') dnl AFTER # dnl DAEMON_OPTIONS('Port=smtp, Name=MTA') dnl Check that the next lines are correct: # FEATURE(`virtusertable', `hash -o /etc/mail/virtusertable.db')dnl # ... # FEATURE(use_cw_file)dnl # ... # FEATURE(`access_db', `hash -T<TMPF> -o /etc/mail/access.db')dnl Update sendmail.cf # m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf Open the port 25 adding the proper line in the iptables file # vi /etc/sysconfig/iptables # -A INPUT -m state --state NEW -m tcp --dport 25 -j ACCEPT restart iptables and sendmail # service iptables restart # service sendmail restart So i thought that would be ok, but when i tried: # mail '[email protected]' # Subject: test subject # test content #. I checked the mail log: # vi /var/log/maillog And that is what I found: Aug 14 17:36:24 dev-admin-test sendmail[20682]: r7D8RItS019578: to=<[email protected]>, ctladdr=<[email protected]> (0/0), delay=1+00:09:06, xdelay=00:00:00, mailer=esmtp, pri=2460500, relay=alt4.gmail- smtp-in.l.google.com., dsn=4.0.0, stat=Deferred: Connection timed out with alt4.gmail-smtp-in.l.google.com. I do not understand why there is a connection time out. Am I missing something? Can anyone help me, please? Thank you.

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  • Running two Magentos installations, one of which has 3 stores set up as multi-store. Which server?

    - by Pedro Peixoto
    I want to run 4 Magento stores in 2 different installations. 1 is a standalonne installation with 3 languages. The other is a multi-store with 3 different online stores in different domains. At the moment we have a VPS with 1GB memory, would that be enough? I ask because I've finished the standalone store and already put it online, and the server is already running on 62% memory. The ideal would be that this is enough as my company wouldn't like to move to a Dedicated Server (as it involves costs). I'm sure I can try to optimize Magento to run on lower memory (I'm expecting visits averaging 2000/day on all sites), if I could have some tips on the best way to do that Id appreciate it too.

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  • Design-time failure: WPF, Usercontrols and Namespaces

    - by Simon Woods
    Hi I have a very simple WPF project comprising a Window and Usercontrol. I'm very much in a learning phase. It works fine when I run it. However, I am unable to see the form in design time. The problem, I believe is something to do with namespaces, but I don't understand where. It may well be a simple error Main Window XML <Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:views="clr-namespace:UserLogin" x:Class="UserLogin.MainView" x:Name="MainViewWindow" mc:Ignorable="d" Title="Login" Height="141" Width="347" > <Grid> <views:LoginView /> </Grid> </Window> Main Window CodeBehind Imports Microsoft.VisualBasic Imports System Imports System.Windows Imports UserLogin Namespace UserLogin Partial Public Class MainView Inherits System.Windows.Window Public Sub New() InitializeComponent() End Sub End Class End Namespace Usercontrol XAML <UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" x:Class="UserLogin.LoginView" x:Name="LoginViewControl" mc:Ignorable="d" d:DesignHeight="96" d:DesignWidth="298"> <Grid Height="96" Width="298"> <Button Command="{Binding OKCommand}" Height="21" Margin="0,0,90,16" Name="btnOK" VerticalAlignment="Bottom" HorizontalAlignment="Right" Width="76">OK</Button> <Button Command="{Binding CancelCommand}" Height="21" HorizontalAlignment="Right" Margin="0,0,9,16" Name="btnCancel" VerticalAlignment="Bottom" Width="75">Cancel</Button> <Label Height="23" HorizontalAlignment="Left" Margin="10,5,0,0" Name="Label1" VerticalAlignment="Top" Width="85">Name:</Label> <Label HorizontalAlignment="Left" Margin="10,32,0,0" Name="Label2" Width="85" Height="29" VerticalAlignment="Top">Password:</Label> <TextBox Margin="0,31,6,0" Name="txtPassword" Height="22" VerticalAlignment="Top" HorizontalAlignment="Right" Width="182" /> <ComboBox Height="22" Margin="110,6,6,0" Name="cboNames" VerticalAlignment="Top" /> </Grid> </UserControl> Usercontrol CodeBehind Imports Microsoft.VisualBasic Imports System Imports UserLogin Namespace UserLogin Partial Public Class LoginView Inherits System.Windows.Controls.UserControl Public Sub New() InitializeComponent() End Sub End Class End Namespace I think I'm missing something this namespace xmlns:views="clr-namespace:UserLogin" since intellisense doesn't give me the usercontrol declared within it in the XAML designer but rather reports the error "Unable to load the metadata for the assembly ... etc etc" Thx for any suggestions Simon

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  • Adding marker to the retrieved location

    - by Rahul Varma
    I have displayed the map in my app by using the following code. I have retrieved info from the database and displayed the map. Now i want to add marker to the retrieved location... googleMao.java public class googleMap extends MapActivity{ private MapView mapView; private MapController mc; GeoPoint p; long s; Cursor cur; SQLiteDatabase db; createSqliteHelper csh; String qurry; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.map); // String qurry=getIntent().getStringExtra("value"); //here is calling the map string qurry s = getIntent().getLongExtra("value",2); map(); mapView = (MapView) findViewById(R.id.mapview1); LinearLayout zoomLayout = (LinearLayout)findViewById(R.id.zoom); View zoomView = mapView.getZoomControls(); zoomLayout.addView(zoomView, new LinearLayout.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); //mapView.displayZoomControls(true); mapView.setBuiltInZoomControls(true); mc = mapView.getController(); String coordinates[] = {"1.352566007", "103.78921587"}; double lat = Double.parseDouble(coordinates[0]); double lng = Double.parseDouble(coordinates[1]); Geocoder geoCoder = new Geocoder(this, Locale.getDefault()); try { List<Address> addresses = geoCoder.getFromLocationName(qurry,5); String add = ""; if (addresses.size() > 0) { p = new GeoPoint( (int) (addresses.get(0).getLatitude() * 1E6), (int) (addresses.get(0).getLongitude() * 1E6)); mc.animateTo(p); mapView.invalidate(); mc.setZoom(6); } } catch (IOException e) { e.printStackTrace(); } } @Override protected boolean isRouteDisplayed() { // Required by MapActivity return false; } public void map() { String[] str={"type"}; int[] i={R.id.type}; csh=new createSqliteHelper(this); db=csh.getReadableDatabase(); cur=db.rawQuery("select type from restaurants where _id="+s,null); if(cur.moveToFirst()) { qurry=cur.getString(cur.getColumnIndex("type")); } } }

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  • Random position without overlapping

    - by Hwang
    How to stop MCs from overlapping each other? private function loadWishes():void { for (i; i } } private function checkOverlap(wishB:MovieClip) { wishB.x=Math.random()*stage.stageWidth; wishB.y=Math.random()*stage.stageHeight; for (var i:uint=0; i This doesn't seems to be working cause the amount of it checking whether MC is overlapping is about the amount of MC on stage. how to make it keep checking till everything's fine?

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  • How to access a named element of a derived user control in silverlight ?

    - by Mrt
    Hello, I have a custom base user control in silverlight. <UserControl x:Class="Problemo.MyBaseControl" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400"> <Grid x:Name="LayoutRoot" Background="White"> <Border Name="HeaderControl" Background="Red" /> </Grid> </UserControl> With the following code behind public partial class MyBaseControl : UserControl { public UIElement Header { get; set; } public MyBaseControl() { InitializeComponent(); Loaded += MyBaseControl_Loaded; } void MyBaseControl_Loaded(object sender, RoutedEventArgs e) { HeaderControl.Child = Header; } } I have a derived control. <me:MyBaseControl x:Class="Problemo.MyControl" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" xmlns:me="clr-namespace:Problemo" d:DesignHeight="300" d:DesignWidth="400"> <me:MyBaseControl.Header> <TextBlock Name="header" Text="{Binding Text}" /> </me:MyBaseControl.Header> </me:MyBaseControl> With the following code behind. public partial class MyControl : MyBaseControl { public string Text { get; set; } public MyControl(string text) { InitializeComponent(); Text = text; } } I'm trying to set the text value of the header textblock in the derived control. It would be nice to be able to set both ways, i.e. with databinding or in the derived control code behind, but neither work. With the data binding, it doesn't work. If I try in the code behind I get a null reference to 'header'. This is silverlight 4 (not sure if that makes a difference) Any suggestions on how to do with with both databinding and in code ? Cheers

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  • AS3 car race game?

    - by ashok patidar
    I am trying to make a racing game with an overhead view looking down. There will be a separate mc for the ground and another separate mc for the players car. How can I do this? O ya and just in case i am thinking the way I did: I tried to "rotate" the ground but when the car moves down the ground it moves away from the registration point, so therefore it rotates non relative to the car i want to make this game in as3.

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  • Symfony2 - PdfBundle not working

    - by ElPiter
    Using Symfony2 and PdfBundle to generate dynamically PDF files, I don't get to generate the files indeed. Following documentation instructions, I have set up all the bundle thing: autoload.php: 'Ps' => __DIR__.'/../vendor/bundles', 'PHPPdf' => __DIR__.'/../vendor/PHPPdf/lib', 'Imagine' => array(__DIR__.'/../vendor/PHPPdf/lib', __DIR__.'/../vendor/PHPPdf/lib/vendor/Imagine/lib'), 'Zend' => __DIR__.'/../vendor/PHPPdf/lib/vendor/Zend/library', 'ZendPdf' => __DIR__.'/../vendor/PHPPdf/lib/vendor/ZendPdf/library', AppKernel.php: ... new Ps\PdfBundle\PsPdfBundle(), ... I guess all the setting up is correctly configured, as I am not getting any "library not found" nor anything on that way... So, after all that, I am doing this in the controller: ... use Ps\PdfBundle\Annotation\Pdf; ... /** * @Pdf() * @Route ("/pdf", name="_pdf") * @Template() */ public function generateInvoicePDFAction($name = 'Pedro') { return $this->render('AcmeStoreBundle:Shop:generateInvoice.pdf.twig', array( 'name' => $name, )); } And having this twig file: <pdf> <dynamic-page> Hello {{ name }}! </dynamic-page> </pdf> Well. Somehow, what I just get in my page is just the normal html generated as if it was a normal Response rendering. The Pdf() annotation is supposed to give the "special" behavior of creating the PDF file instead of rendering normal HTML. So, having the above code, when I request the route http://www.mysite.com/*...*/pdf, all what I get is the following HTML rendered: <pdf> <dynamic-page> Hello Pedro! </dynamic-page> </pdf> (so a blank HTML page with just the words Hello Pedro! on it. Any clue? Am I doing anything wrong? Is it mandatory to have the alternative *.html.twig apart from the *.pdf.twig version? I don't think so... :(

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