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  • How to route KVM virtual machine audio to Ubuntu 11.10 host using virt-manager?

    - by iGadget
    I've been using KVM in combination with Virt-Manager and Remmina at a fair success up until now. The issue I need to solve now is to get audio from a virtualized Windows XP and make it audible on the Ubuntu 11.10 host. Remmina / RDP works for 'simple' audio (system sounds and such), but when the source gets trickier (e.g. Flash audio), Remmina / RDP messes up. So I figured I'd just connect to the machine directly using Virt-Manager. Unfortunately, it seems that even though I have successfully configured the AC97 audio device on WinXP, it's unable to get it's output to the Ubuntu host. This is probably because Virt-Manager uses VNC (and AFAIK, VNC doesn't transport audio). Does anyone know if there is a solution to fix this? I've heard of Spice, but the installation required so much voodoo last time I checked, I figured I'd let that solution boil to maturity a little longer ;) But perhaps there are other options I haven't thought of yet (which don't require switching to VirtualBox / VMware)...

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  • Does the Virtual PC XP Mode need safety measures?

    - by Ivo
    Does the Virtual PC XP-Mode (or any other virtualized mode) require safety measures, such as antivirus or a firewall? I'm just wondering if the XP-Mode would be a large security loophole, since it's so much more integrated into Windows 7. Actually I'm wondering the same for Portable Ubuntu, are their any safety measures I should undertake, so that I don't open a backdoor on my computer.

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  • How do you prevent inflation in a virtual economy?

    - by Tetrad
    With your typical MMORPG, players can usually farm the world for raw materials essentially forever. Monsters/mineral veins/etc are usually on some sort of respawn timer, so other than time there really isn't a good way to limit the amount of new currency entering the system. That really only leaves money sinks to try to take money out of the system. What are some strategies to prevent inflation of the in-game currency?

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  • A great option for those of us who live by virtual environments, SQL Server 2008 R2 sysprep

    - by Enrique Lima
    For a long time when creating images for my development environment, I had to install the OS and then sysprep.  Only after that would I then create a differencing drive/image that would have SQL Server. So, the thought of having a base/core image for SQL Server as a template was not easily done.  Well, how do things change?  SQL Server 2008 R2 gives us the option now. Check this HOW TO provided on the library docs at TechNet.  http://technet.microsoft.com/en-us/library/ee210664(SQL.105).aspx

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  • How do i share files between my ubuntu host and xp pro virtual machine? [duplicate]

    - by jake
    Possible Duplicate: Shared folders in XP virtualbox guest I'm using Virtualbox 4.1.8 to run Windows XP PRO. I have ironed out all other kinks on my own but I still can't access a file share. The sole purpose of running a VM is to get iTunes for my iPhone but I can't get to my music file from my guest OS, I'm also new to Ubuntu so im not sure if I have done all the updates right or not, any would be welcome

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  • Can't install .NET 4.0 on Windows XP virtual machine! (VMWare Player)

    - by Vercas
    So, every time I try to install .NET Framework 4.0 on my Windows XP Professional SP3 VMWare Player virtual machine, I get a fatal error. It doesn't work with either Windows Update, the Web Installer or the normal installer! I don't know if it matters (AND I HOPE IT DOES NOT), but the host OS's Operating System drive is encrypted, and the VM HDD file resides on that partition. I don't think it matters because other programs can be installed! And downloaded!

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  • Application workflow

    - by manseuk
    I am in the planning process for a new application, the application will be written in PHP (using the Symfony 2 framework) but I'm not sure how relevant that is. The application will be browser based, although there will eventually be API access for other systems to interact with the data stored within the application, again probably not relavent at this point. The application manages SIM cards for lots of different providers - each SIM card belongs to a single provider but a single customer might have many SIM cards across many providers. The application allows the user to perform actions against the SIM card - for example Activate it, Barr it, Check on its status etc Some of the providers provide an API for doing this - so a single access point with multiple methods eg activateSIM, getStatus, barrSIM etc. The method names differ for each provider and some providers offer methods for extra functions that others don't. Some providers don't have APIs but do offer these methods by sending emails with attachments - the attachments are normally a CSV file that contains the SIM reference and action required - the email is processed by the provider and replied to once the action has been complete. To give you an example - the front end of my application will provide a customer with a list of SIM cards they own and give them access to the actions that are provided by the provider of each specific SIM card - some methods may require extra data which will either be stored in the backend or collected from the user frontend. Once the user has selected their action and added any required data I will handle the process in the backend and provide either instant feedback, in the case of the providers with APIs, or start the process off by sending an email and waiting for its reply before processing it and updating the backend so that next time the user checks the SIM card its status is correct (ie updated by a backend process). My reason for creating this question is because I'm stuck !! I'm confused about how to approach the actual workflow logic. I was thinking about creating a Provider Interface with the most common methods getStatus, activateSIM and barrSIM and then implementing that interface for each provider. So class Provider1 implements Provider - Then use a Factory to create the required class depending on user selected SIM card and invoking the method selected. This would work fine if all providers offered the same methods but they don't - there are a subset which are common but some providers offer extra methods - how can I implement that flexibly ? How can I deal with the processes where the workflow is different - ie some methods require and API call and value returned and some require an email to be sent and the next stage of the process doesn't start until the email reply is recieved ... Please help ! (I hope this is a readable question and that this is the correct place to be asking) Update I guess what I'm trying to avoid is a big if or switch / case statement - some design pattern that gives me a flexible approach to implementing this kind of fluid workflow .. anyone ?

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  • How would I broadcast a subdomain/virtual name on a local server with people connected to the same network

    - by Sarmen B.
    I have a server connected to the router which has ubuntu 12.04. It is has apache/mysql/php all installed ready to go. the folder structure is like this: /var/www -- this isnt the root -/libs -/logs -/public - this is the root -/vhosts - all subdomains go here I have a folder in vhosts named mysite. I went into /etc/apache2/sites-available and created a file and here are the contents - (vhost file). and I also added an entry in /etc/hosts file containing: 127.0.1.1 mysite.dev and I also did sudo a2ensite mysite i tried accessing the site from a computer via mysite.dev and our public ip into the server but i was not able to view it. the public directory in the structure above does display on all computers when i try our public ip. but for anything added in vhosts the site wont show. there is no domain attached its just our ip. I tried changing the port from 80 to say 9999 in the mysite file in sites-available and tried myip:9999 but that didnt work either. what am I doing wrong? edit: i forgot to mention that the server is dmzed on the router.

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  • Virtual PC in Remote Desktop session runs very slowly??

    - by Michael Bray
    I have a VPN to my work which is quite fast... I Remote Desktop to my work PC, which is running a Microsoft Virtual PC. Working with the PC while I'm actually at work isn't too bad, but when I try to interact with it over the remote desktop, it is VERY slow to respond. Even simple typing can be slow, but screen painting and response time is painfully obvious. Any suggestions to help speed it up?

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  • .NET remoting exception: Permission denied: cannot call non-public or static methods remotely.

    - by Vilx-
    I'm writing a program which will allow to load a specific managed .DLL file and play with it. Since I want the ability to unload the .DLL file, I'm creating two AppDomains - one for the app itself, the other for the currently loaded .DLL. Since most of the objects in the loaded .DLL do not serialize well, I'm creating a MarshalByRefObject wrapper class which will keep the object itself in its own AppDomain, and expose some reflection functions to the main application AppDomain. However when I try to invoke a method on the remote object I get stuck with an exception: Permission denied: cannot call non-public or static methods remotely. This is very strange, because I'm not using any non-public or static methods at all. In essence, what I have is: class RemoteObjectWrapper: MarshalByRefObject { private Type SourceType; private object Source; public RemoteObjectWrapper(object source) { if (source == null) throw new ArgumentNullException("source"); this.Source = source; this.SourceType = source.GetType(); } public T WrapValue<T>(object value) { if ( value == null ) return default(T); var TType = typeof(T); if (TType == typeof(RemoteObjectWrapper)) value = new RemoteObjectWrapper(value); return (T)value; } public T InvokeMethod<T>(string methodName, params object[] args) { return WrapValue<T>(SourceType.InvokeMember(methodName, System.Reflection.BindingFlags.FlattenHierarchy | System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.InvokeMethod | System.Reflection.BindingFlags.Public, null, this.Source, args)); } } And I get the exception when I try to do: var c = SomeInstanceOfRemoteObjectWrapper.InvokeMethod<RemoteObjectWrapper>("somePublicMethod", "some string parameter"); What's going on here? As far as I can understand, the InvokeMethod method doesn't even get executed, the exception is thrown when I try to run it. Added: To clarify - SomeInstanceOfRemoteObjectWrapper is constructed in the .DLL's AppDomain and then returned to my main AppDomain, The InvokeMethod<T>() is called from my main AppDomain (and I expect it to execute in the .DLL's AppDomain).

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  • Any way to avoid creating a huge C# COM interface wrapper when only a few methods needed?

    - by Paul Accisano
    Greetings all, I’m working on a C# program that requires being able to get the index of the hot item in Windows 7 Explorer’s new ItemsView control. Fortunately, Microsoft has provided a way to do this through UI Automation, by querying custom properties of the control. Unfortunately, the System.Windows.Automation namespace inexplicably does not seem to provide a way to query custom properties! This leaves me with the undesirable position of having to completely ditch the C# Automation namespace and use only the unmanaged COM version. One way to do it would be to put all the Automation code in a separate C++/CLI module and call it from my C# application. However, I would like to avoid this option if possible, as it adds more files to my project, and I’d have to worry about 32/64-bit problems and such. The other option is to make use of the ComImport attribute to declare the relevant interfaces and do everything through COM-interop. This is what I would like to do. However, the relevant interfaces, such as IUIAutomation and IUIAutomationElement, are FREAKING HUGE. They have hundreds of methods in total, and reference tons and tons of interfaces (which I assume I would have to also declare), almost all of which I will never ever use. I don’t think the UI Automation interfaces are declared in any Type Library either, so I can’t use TLBIMP. Is there any way I can avoid having to manually translate a bajillion method signatures into C# and instead only declare the ten or so methods I actually need? I see that C# 4.0 added a new “dynamic” type that is supposed to ease COM interop; is that at all relevant to my problem? Thanks

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  • Ruby on Rails: How to sanitize a string for SQL when not using find and other built-in methods?

    - by williamjones
    I'm trying to sanitize a string that involves user input without having to resort to manually crafting my own possibly buggy regex if possible. There are a number of methods in Rails that can allow you to enter in native SQL commands, how do people escape user input for those? The question I'm asking is a broad one, but in my particular case, I'm working with a column in my Postgres database that Rails does not natively understand as far as I know, the tsvector, which holds plain text search information. Rails is able to write and read from it as if it's a string, however, unlike a string, it doesn't seem to be automatically escaping it when I do things like vector= inside the model. For example, when I do model.name='::', where name is a string, it works fine. When I do model.vector='::' it errors out: ActiveRecord::StatementInvalid: PGError: ERROR: syntax error in tsvector: "::" "vectors" = E'::' WHERE "id" = 1 This seems to be a problem caused by lack of escaping of the semicolons, and I can manually set the vector='\:\:' fine. I also had the bright idea, maybe I can just call something like: ActiveRecord::Base.connection.execute "UPDATE medias SET vectors = ? WHERE id = 1", "::" However, this syntax doesn't work, because the raw SQL commands don't have access to find's method of escaping and inputting strings by using the ? mark. This strikes me as the same problem as calling connection.execute with any type of user input, as it all boils down to sanitizing the strings, but I can't seem to find any way to manually call Rails' SQL string sanitization methods. Can anyone provide any advice?

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  • How to determine which inheriting class is using an abstract class' methods.

    - by Kin
    In my console application have an abstract Factory class "Listener" which contains code for listening and accepting connections, and spawning client classes. This class is inherited by two more classes (WorldListener, and MasterListener) that contain more protocol specific overrides and functions. I also have a helper class (ConsoleWrapper) which encapsulates and extends System.Console, containing methods for writing to console info on what is happening to instances of the WorldListener and MasterListener. I need a way to determine in the abstract ListenerClass which Inheriting class is calling its methods. Any help with this problem would be greatly appreciated! I am stumped :X Simplified example of what I am trying to do. abstract class Listener { public void DoSomething() { if(inheriting class == WorldListener) ConsoleWrapper.WorldWrite("Did something!"); if(inheriting class == MasterListener) ConsoleWrapper.MasterWrite("Did something!"); } } public static ConsoleWrapper { public void WorldWrite(string input) { System.Console.WriteLine("[World] {0}", input); } } public class WorldListener : Listener { public void DoSomethingSpecific() { ConsoleWrapper.WorldWrite("I did something specific!"); } } public void Main() { new WorldListener(); new MasterListener(); } Expected output [World] Did something! [World] I did something specific! [Master] Did something! [World] I did something specific!

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  • What's the Matlab equivalent of NULL, when it's calling COM/ActiveX methods?

    - by David M
    Hi, I maintain a program which can be automated via COM. Generally customers use VBS to do their scripting, but we have a couple of customers who use Matlab's ActiveX support and are having trouble calling COM object methods with a NULL parameter. They've asked how they do this in Matlab - and I've been scouring Mathworks' COM/ActiveX documentation for a day or so now and can't figure it out. Their example code might look something like this: function do_something() OurAppInstance = actxserver('Foo.Application'); OurAppInstance.Method('Hello', NULL) end where NULL is where in another language, we'd write NULL or nil or Nothing, or, of course, pass in an object. The problem is this is optional (and these are implemented as optional parameters in most, but not all, cases) - these methods expect to get NULL quite often. They tell me they've tried [] (which from my reading seemed the most likely) as well as '', Nothing, 'Nothing', None, Null, and 0. I have no idea how many of those are even valid Matlab keywords - certainly none work in this case. Can anyone help? What's Matlab's syntax for a null pointer / object for use as a COM method parameter? Update: Thanks for all the replies so far! Unfortunately, none of the answers seem to work, not even libpointer. The error is the same in all cases: Error: Type mismatch, argument 2 This parameter in the COM type library is described in RIDL as: HRESULT _stdcall OurMethod([in] BSTR strParamOne, [in, optional] OurCoClass* oParamTwo, [out, retval] VARIANT_BOOL* bResult); The coclass in question implements a single interface descending from IDispatch.

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  • Should you declare methods using overloads or optional parameters in C# 4.0?

    - by Greg Beech
    I was watching Anders' talk about C# 4.0 and sneak preview of C# 5.0, and it got me thinking about when optional parameters are available in C# what is going to be the recommended way to declare methods that do not need all parameters specified? For example something like the FileStream class has about fifteen different constructors which can be divided into logical 'families' e.g. the ones below from a string, the ones from an IntPtr and the ones from a SafeFileHandle. FileStream(string,FileMode); FileStream(string,FileMode,FileAccess); FileStream(string,FileMode,FileAccess,FileShare); FileStream(string,FileMode,FileAccess,FileShare,int); FileStream(string,FileMode,FileAccess,FileShare,int,bool); It seems to me that this type of pattern could be simplified by having three constructors instead, and using optional parameters for the ones that can be defaulted, which would make the different families of constructors more distinct [note: I know this change will not be made in the BCL, I'm talking hypothetically for this type of situation]. What do you think? From C# 4.0 will it make more sense to make closely related groups of constructors and methods a single method with optional parameters, or is there a good reason to stick with the traditional many-overload mechanism?

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  • In a class with no virtual methods or superclass, is it safe to assume (address of first member vari

    - by Jeremy Friesner
    Hi all, I made a private API that assumes that the address of the first member-object in the class will be the same as the class's this-pointer... that way the member-object can trivially derive a pointer to the object that it is a member of, without having to store a pointer explicitly. Given that I am willing to make sure that the container class won't inherit from any superclass, won't have any virtual methods, and that the member-object that does this trick will be the first member object declared, will that assumption hold valid for any C++ compiler, or do I need to use the offsetof() operator (or similar) to guarantee correctness? To put it another way, the code below does what I expect under g++, but will it work everywhere? class MyContainer { public: MyContainer() {} ~MyContainer() {} // non-virtual dtor private: class MyContained { public: MyContained() {} ~MyContained() {} // Given that the only place Contained objects are declared is m_contained // (below), will this work as expected on any C++ compiler? MyContainer * GetPointerToMyContainer() { return reinterpret_cast<MyContainer *>(this); } }; MyContained m_contained; // MUST BE FIRST MEMBER ITEM DECLARED IN MyContainer int m_foo; // other member items may be declared after m_contained float m_bar; };

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  • How to determine which inheriting class is using an abstract class's methods.

    - by Kin
    In my console application have an abstract Factory class "Listener" which contains code for listening and accepting connections, and spawning client classes. This class is inherited by two more classes (WorldListener, and MasterListener) that contain more protocol specific overrides and functions. I also have a helper class (ConsoleWrapper) which encapsulates and extends System.Console, containing methods for writing to console info on what is happening to instances of the WorldListener and MasterListener. I need a way to determine in the abstract ListenerClass which Inheriting class is calling its methods. Any help with this problem would be greatly appreciated! I am stumped :X Simplified example of what I am trying to do. abstract class Listener { public void DoSomething() { if(inheriting class == WorldListener) ConsoleWrapper.WorldWrite("Did something!"); if(inheriting class == MasterListener) ConsoleWrapper.MasterWrite("Did something!"); } } public static ConsoleWrapper { public void WorldWrite(string input) { System.Console.WriteLine("[World] {0}", input); } } public class WorldListener : Listener { public void DoSomethingSpecific() { ConsoleWrapper.WorldWrite("I did something specific!"); } } public void Main() { new WorldListener(); new MasterListener(); } Expected output [World] Did something! [World] I did something specific! [Master] Did something! [World] I did something specific!

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  • How to structure code with 2 methods, one after another, which throw the same two exceptions?

    - by dotnetdev
    Hi, I have two methods, one called straight after another, which both throw the exact same 2 exceptions (IF an erroneous condition occurs, not stating that I'm getting exceptions). For this, should I write seperate try and catch blocks with the one statement in each try block and catch both exceptions (Both of which I can handle as I checked MSDN class library reference and there is something I can do, eg, re-open SqlConnection or run a query and not a stored proc which does not exist). So code like this: try { obj.Open(); } catch (SqlException) { // Take action here. } catch (InvalidOperationException) { // Take action here. } And likewise for the other method I call straight after. This seems like a very messy way of coding. The other way is to code with the exception variable (that is ommited as I am using AOP to log the exception details, using a class-level attribute). Doing this, this could aid me in finding out which method caused an exception and then taking action accordingly. Is this the best approach or is there another best practise altogether? I also assume that, as only these two methods are thrown, I do not need to catch Exception as that would be for an exception I cannot handle (causes way out of my control). Thanks

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  • jQuery plugin design pattern for using `this` in private methods?

    - by thebossman
    I'm creating jQuery plugins using the pattern from the Plugins Authoring page: (function($) { $.fn.myPlugin = function(settings) { var config = {'foo': 'bar'}; if (settings) $.extend(config, settings); this.each(function() { // element-specific code here }); return this; }; })(jQuery); My code calls for several private methods that manipulate this. I am calling these private methods using the apply(this, arguments) pattern. Is there a way of designing my plugin such that I don't have to call apply to pass this from method to method? My modified plugin code looks roughly like this: (function($) { $.fn.myPlugin = function(settings) { var config = {'foo': 'bar'}; if (settings) $.extend(config, settings); this.each(function() { method1.apply(this); }); return this; }; function method1() { // do stuff with $(this) method2.apply(this); } function method2() { // do stuff with $(this), etc... } })(jQuery);

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