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  • Does ssh key need to be named id_rsa?

    - by dustyprogrammer
    I have come across this problem a couple of times when creating build servers with keyed authentication. I was wondering if anyone else has experience this. I have a couple of keys for my current user that may connect to different machines. Let say machine1 and machine2. I have pasted my public key into their respective authorized_keys file. The first one I have named the first key id_rsa and the second key bender. When I try to connect to bender I get the following output with my verbose ssh connection debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey debug1: Next authentication method: publickey debug1: Trying private key: /home/bozo/.ssh/.ssh/identity debug1: Trying private key: /home/bozo/.ssh/.ssh/id_rsa debug1: Trying private key: /home/bozo/.ssh/id_dsa debug1: No more authentication methods to try. Permission denied (publickey). It only offers the id_rsa key, as you can see above. Is this correct? If so why? How do I get it to offer more keys? I know it is a problem I see intermittently, because I at home I have multiple keys without much trouble. I would also appreciate a overview on how the pub and private keys interact with the client and server. I thought I had a pretty decent idea, but apparently I am missing something. Please and thank you.

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  • Named output parameters vs return values

    - by Abyx
    Which code is better: // C++ void handle_message(...some input parameters..., bool& wasHandled) void set_some_value(int newValue, int* oldValue = nullptr) // C# void handle_message(...some input parameters..., out bool wasHandled) void set_some_value(int newValue, out int oldValue) or bool handle_message(...some input parameters...) ///< Returns -1 if message was handled //(sorry, this documentation was broken a year ago and we're too busy to fix it) int set_some_value(T newValue) // (well, it's obvious what this function returns, so I didn't write any documentation for it) The first one doesn't have and need any documentation. It's a self-documenting code. Output value clearly says what it means, and it's really hard to make a change like this: - void handle_message(Message msg, bool& wasHandled) { - wasHandled = false; - if (...) { wasHandled = true; ... + void handle_message(Message msg, int& wasHandled) { + wasHandled = -1; + if (...) { wasHandled = ...; With return values such change could be done easily /// Return true if message was handled - bool handle_message(Message msg) { + int handle_message(Message msg) { ... - return true; + return -1; Most of compilers don't (and can't) check documentation written in comments. Programmers also tend to ignore comments while editing code. So, again, the question is: if subroutine has single output value, should it be a procedure with well-named self-documenting output parameter, or should it be a function which returns an unnamed value and have a comment describing it?

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  • Why isn't the static constructor of the parent class called when invoking a method on a nested class

    - by Ryan Ische
    Given the following code, why isn't the static constructor of "Outer" called after the first line of "Main"? namespace StaticTester { class Program { static void Main( string[] args ) { Outer.Inner.Go(); Console.WriteLine(); Outer.Go(); Console.ReadLine(); } } public static partial class Outer { static Outer() { Console.Write( "In Outer's static constructor\n" ); } public static void Go() { Console.Write( "Outer Go\n" ); } public static class Inner { static Inner() { Console.Write( "In Inner's static constructor\n" ); } public static void Go() { Console.Write( "Inner Go\n" ); } } } }

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  • What is the difference between a constructor and a procedure in Delphi records?

    - by HMcG
    Is there difference in behavior between a constructor call and a procedure call in Delphi records? I have a D2010 code sample I want to convert to D2009 (which I am using). The sample uses a parameterless constructor, which is not permitted in Delphi 2009. If I substitute a simple parameterless procedure call, is there any functional difference for records? I.E. TVector = record private FImpl: IVector; public constructor Create; // not allowed in D2009 end; becomes TVector = record private FImpl: IVector; public procedure Create; // so change to procedure end; As far as I can see this should work, but I may be missing something.

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  • How are Flash library symbols constructed? Why are width/height already available in constructor?

    - by Triynko
    Suppose I draw a square on the stage, convert it to a symbol, export it for ActionScript with a classname of "MySquare" (and of course a base class of MovieClip). How is it that in the MySquare constructor, the width and height of this MovieClip are already available? In fact, any named instances in the clip are also available. I'm confused about how the Flash player seems to be able to pre-construct my movie clip by populating its properties and child clips before my constructor for the class ever runs. I thought that it would have to first construct the clip, calling my constructor code, and then construct and add any children, but obviously the player is doing something special for clips designed in the Flash authoring environment.

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  • Why does this Rails named scope return empty (uninitialized?) objects?

    - by mipadi
    In a Rails app, I have a model, Machine, that contains the following named scope: named_scope :needs_updates, lambda { { :select => self.column_names.collect{|c| "\"machines\".\"#{c}\""}.join(','), :group => self.column_names.collect{|c| "\"machines\".\"#{c}\""}.join(','), :joins => 'LEFT JOIN "machine_updates" ON "machine_updates"."machine_id" = "machines"."id"', :having => ['"machines"."manual_updates" = ? AND "machines"."in_use" = ? AND (MAX("machine_updates"."date") IS NULL OR MAX("machine_updates"."date") < ?)', true, true, UPDATE_THRESHOLD.days.ago] } } This named scope works fine in development mode. In production mode, however, it returns the 2 models as expected, but the models are empty or uninitialized; that is, actual objects are returned (not nil), but all the fields are nil. For example, when inspecting the return value of the named scope in the console, the following is returned: [#<Machine >, #<Machine >] But, as you can see, all the fields of the objects returned are set to nil. The production and development environments are essentially the same. Both are using a SQLite database. Any ideas what's going wrong?

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  • SQL Server 2005 - Enabling both Named Pipes & TCP/IP protocols?

    - by Clinemi
    We have a SQL Server 2005 database, and currently all our users are connecting to the database via the TCP/IP protocol. The SQL Server Configuration Manager allows you to "enable" both Named Pipes, and TCP/IP connections at the same time. Is this a good idea? My question is not whether we should use named pipes instead of TCP/IP, but are there problems associated with enabling both? One of our client's IT guys, says that enabling database communication with both protocols will limit the bandwidth that either protocol can use - to like 50% of the total. I would think that the bandwidth that TCP/IP could use would be directly tied (inversely) to the amount of traffic that Named Pipes (or any of the other types of traffic) were occupying on the network at that moment. However, this IT person is indicating that the fact that we have enabled two protocols on the server, artificially limits the bandwidth that TCP/IP can use. Is this correct? I did Google searches but could not come up with an answer to this question. Any help would be appreciated.

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  • BIND zones and named files

    - by preethika
    I've installed BIND in my Windows server2003. i've configured the named file in C:\named\etc\named.conf as: options { directory "c:\named\zones"; allow-transfer { none; }; recursion no; }; zone "tisdns.com" IN { type master; file "db.tisdns.com.txt"; allow-transfer { none; }; }; My zone file is configured in C:\named\zones\db.tisdns.com.txt as: $TTL 6h @ IN SOA ns1.tisdns.com. hostmaster.tisdns.co… ( 2010010901 10800 3600 604800 86400 ) @ NS ns1.tisdns.com. ns1 IN A 192.168.0.17 mug IN A 192.168.0.103 key "rndc-key" { algorithm hmac-md5; secret "M0oW24WFQZhMu9wTq8qepw=="; }; controls { inet 127.0.0.1 port 53 allow { 127.0.0.1; } keys { "rndc-key"; }; }; In the above i've given the name to the domain as "tisdns". i want to create a new domain name in a different zone file. how can i create it?

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  • Quickly Copy Movie Files to Individually Named Folders

    - by DigitalGeekery
    Some HTPC media manager applications require movie files to be in stored in separate folders to properly store information such as cover art images and other metadata. Here we look at copying movie files to individual folders. If you already have a large movie collection stored in a single folder, we’ll show you how to quickly move those files into their own individually named folders. File2Folder FIle2folder is a handy portable app that automatically creates and moves movie files into a folder of the same filename. There is no installation needed. Simply download and run the .exe file (link below). Enter the current movie directory, or browse for the folder. File2folder now supports both local and network shares. When you are ready to create the folders and move the files, click Move! You’ll see the move progress displayed in the window. When the process is finished, you’ll have all your movie file in individual folders.   Change your mind? Just click the Undo! button…   …and the move and folder creation process will be undone. If you would like to have the folder monitored for new files, click the Start button. File2folder will process any new files it discovers every 180 seconds. To turn it off, click Stop. This simple little program is a huge timesaver for those looking to organize movie collections for their HTPC. We should also note that this will work with any files, not just videos. Download file2folder Similar Articles Productive Geek Tips Hack: Turn Off Debug Mode in VMWare Workstation 6 BetaAdd Images and Metadata to Windows 7 Media Center Movie LibraryAdd Folders to the Movie Library in Windows 7 Media CenterAutomatically Mount and View ISO files in Windows 7 Media CenterMove the Public Folder in Windows Vista TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips HippoRemote Pro 2.2 Xobni Plus for Outlook All My Movies 5.9 CloudBerry Online Backup 1.5 for Windows Home Server Identify Fonts using WhatFontis.com Windows 7’s WordPad is Actually Good Greate Image Viewing and Management with Zoner Photo Studio Free Windows Media Player Plus! – Cool WMP Enhancer Get Your Team’s World Cup Schedule In Google Calendar Backup Drivers With Driver Magician

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  • Configuring Unity with a closed generic constructor parmater

    - by fearofawhackplanet
    I've been trying to read the article here but I still can't understand it. I have a constructor resembling the following: IOrderStore orders = new OrderStore(new Repository<Order>(new OrdersDataContext())); The constructor for OrderStore: public OrderStore(IRepository<Order> orderRepository) Constructor for Repository<T>: public Repository(DataContext dataContext) How do I set this up in the Unity config file? UPDATE: I've spent the last few hours banging my head against this, and although I'm not really any closer to getting it right I think at least I can be a little more specific about the problem. I've got my IRespository<T> working ok: <typeAlias alias="IRepository" type="MyAssembly.IRepository`1, MyAssembly" /> <typeAlias alias="Repository" type="MyAssembly.Repository`1, MyAssembly" /> <typeAlias alias="OrdersDataContext" type="MyAssembly.OrdersDataContext, MyAssembly" /> <types> <type type="OrdersDataContext"> <typeConfig> <constructor /> <!-- ensures paramaterless constructor used --> </typeConfig> </type> <type type="IRepository" mapTo="Repository"> <typeConfig> <constructor> <param name="dataContext" parameterType="OrdersDataContext"> <dependency /> </param> </constructor> </typeConfig> </type> </types> So now I can get an IRepository like so: IRepository rep = _container.Resolve(); and that all works fine. The problem now is when trying to add the configuration for IOrderStore <type type="IOrderStore" mapTo="OrderStore"> <typeConfig> <constructor> <param name="ordersRepository" parameterType="IRepository"> <dependency /> </param> </constructor> </typeConfig> </type> When I add this, Unity blows up when trying to load the config file. The error message is OrderStore does not have a constructor that takes the parameters (IRepository`1). What I think this is complaining about is because the OrderStore constructor takes a closed IRepository generic type, ie OrderStore(IRepository<Order>) and not OrderStore(IRepository<T>) I don't have any idea how to resolve this.

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  • How to add :format options to a named route in Rails?

    - by Alfred Nerstu
    I've got a named route called profile and I would like to be able to access it as json. But when I look at my rake routes output I see that the (.:format) is missing. How do I add it to a named route? user GET /users/:id(.:format) {:action=>"show", :controller=>"users"} profile /:username {:action=>"show", :controller=>"users"} Thanks in advance!

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  • Explicit constructor still has default values even though a default constructor is not invoked.

    - by Phoenix
    According to my understanding a default constructor initializes the state of the object to default values, so if i provide an explicit no-arg public constructor like this then how are the values of d and e still getting initialized to zero because in this case the default constructor is not invoked. public class B extends A{ private int d; private int e; public B() { System.out.println(d); System.out.println(e); } } EDIT:: The only thing default constructor does is call to super() then how come if i have a explicitly mentioned a constructor here and A has a protected variable say c which is initialized to 17 in its constructor. Should I not be explicitly calling super() to be able to see that change since I'm using my own constructor ? Why is B still getting the value of 17 through inheritance ?

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  • Calling child constructor by casting (ChildClass)parentObject; to track revisions

    - by FreshCode
    To track revisions of a Page class, I have a PageRevision class which inherits from Page and adds a revision ID (Guid RevisionID;). If possible, how should I cast an existing Page object to a PageRevision and ensure that the PageRevision constructor is called to create a new revision ID? I could could have a PageRevision(Page page) constructor which generates the Guid and copies all the Page attributes, but I want to automate it, especially if a Page class has many attributes (and I later add one, and forget to modify the copy constructor). Desired use Page page = new Page(123, "Page Title", "Page Body"); // where 123 is page ID PageRevision revision = (PageRevision)page; // now revision.RevisionID should be a new Guid. Page, PageRevision classes: public class Page { public int ID { get; set; } public string Title { get; set; } public string Body { get; set; } } public class PageRevision : Page { public Guid RevisionID { get; set; } public PageRevision() { this.RevisionID = Guid.NewGuid(); } }

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  • Constructor parameter validation in C# - Best practices

    - by MPelletier
    What is the best practice for constructor parameter validation? Suppose a simple bit of C#: public class MyClass { public MyClass(string text) { if (String.IsNullOrEmpty(text)) throw new ArgumentException("Text cannot be empty"); // continue with normal construction } } Would it be acceptable to throw an exception? The alternative I encountered was pre-validation, before instantiating: public class CallingClass { public MyClass MakeMyClass(string text) { if (String.IsNullOrEmpty(text)) { MessageBox.Show("Text cannot be empty"); return null; } else { return new MyClass(text); } } }

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  • How to read/write from erlang to a named pipe ?

    - by cstar
    I need my erlang application to read and write through a named pipe. Opening the named pipe as a file will fail with eisdir. I wrote the following module, but it is fragile and feels wrong in many ways. Also it fails on reading after a while. Is there a way to make it more ... elegant ? -module(port_forwarder). -export([start/2, forwarder/2]). -include("logger.hrl"). start(From, To)-> spawn(fun() -> forwarder(From, To) end). forwarder(FromFile, ToFile) -> To = open_port({spawn,"/bin/cat > " ++ ToFifo}, [binary, out, eof,{packet, 4}]), From = open_port({spawn,"/bin/cat " ++ FromFifo}, [binary, in, eof, {packet, 4}]), forwarder(From, To, nil). forwarder(From, To, Pid) -> receive {Manager, {command, Bin}} -> ?ERROR("Sending : ~p", [Bin]), To ! {self(), {command, Bin}}, forwarder(From, To, Manager); {From ,{data,Data}} -> Pid ! {self(), {data, Data}}, forwarder(From, To, Pid); E -> ?ERROR("Quitting, first message not understood : ~p", [E]) end. As you may have noticed, it's mimicking the port format in what it accepts or returns. I want it to replace a C code that will be reading the other ends of the pipes and being launched from the debugger.

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  • How to create an alias for a named SQL Server instance

    - by Svish
    On my developer computer I have an SQL Server instance named *developer_2005*. In the resource setting files of a C# application we are creating, the instance name is set to foobar (not really, but just as an example). So when I run the application (in debug or realease) it tries to connect to an SQL Server on localhost, named foobar. I am wondering if it is possible to create an alias or something like that, so that the application actually finds an SQL Server on localhost named foobar, but it is actually connecting to the instance named *developer_2005*. The connection string in the config file of the application is Data Source=localhost\foobar;Initial Catalog=barfoo;Integrated Security=True with provider name System.Data.SqlClient. If I change localhost\foobar to *localhost\developer_2005* then the application can connect like it should. How can I create an alias so that I won't have to change the string in the file? I tried, in SQL Server Management Studio, to create a Server Registration with registered server name "localhost\developer", but this didn't seem to do any good. Not even sure what that really did... But then I discovered SQL Server Configuration Manager\SQL Native Client COnfiguration\Aliases. And I kind of assume this is where the solution lies. But I can't quite figure out how to add a new one... When creating a new one, I have to provide Alias Name, Port No, Protocol and Server, and I don't really have a clue what to put in either of them.

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  • Using new to allocate an array of class elements with an overloaded constructor in C++.

    - by GordoN
    As an example say I have a class foo that does not have a default constructor but one that looks like this foo:foo(int _varA,int _varB) { m_VarA = _varA; m_VarB = _varB; } How would I allocate an array of these. I seem to remember trying somthing like this unsuccessfully. foo* MyArray = new foo[100](25,14). I don't think this will work either. foo* MyArray = new foo[100](25,14) Can this be done? I typically do this by writing the default constructor using some preset values for _varA and _varB. Then adding a function to reset _varA and _varB for each element but that will not work for this case. Thanks for the help.

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  • class classname(value); & class classname=value; difference when constructor is explicit

    - by Mahesh
    When constructor is explicit, it isn't used for implicit conversions. In the given snippet, constructor is marked as explicit. Then why in case foo obj1(10.25); it is working and in foo obj2=10.25; it isn't working ? #include <iostream> class foo { int x; public: explicit foo( int x ):x(x) {} }; int main() { foo obj(10.25); // Not an error. Why ? foo obj2 = 10.25; // Error getchar(); return 0; } error: error C2440: 'initializing' : cannot convert from 'double' to 'foo'

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  • C# Adds Optional and Named Arguments

    Earlier this month Microsoft released Visual Studio 2010, the .NET Framework 4.0 (which includes ASP.NET 4.0), and new versions of their core programming languages: C# 4.0 and Visual Basic 10. In designing the latest versions of C# and VB, Microsoft has worked to bring the two languages into closer parity. Certain features available in C# were missing in VB, and vice-a-versa. Last week I wrote about <a href="http://www.4guysfromrolla.com/articles/042110-1.aspx">Visual Basic 2010's language enhancements</a>, which include implicit line continuation, auto-implemented properties, and collection initializers - three useful features that were available in previous versions of C#. Similarly, C# 4.0 introduces new features to the C# programming language that were

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