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• Why packets injected with libpcap are duplicated?

  - by r0u1i

  I'm using sharppcap in order to send packets as part of a monitoring system. Usually it works well but I've encountered the strangest bug on a hosted vista machine and I would like your help. On that virtual vista machine, injected packets are duplicated. That is, if I send a ping request using libpcap, it somehow gets duplicated and I get two requests on the destination machine. The two requests are almost identical byte-wise, and the only difference between them is that the second packet's TTL field is one minus the original packet's value. Using wireshark I can see the packet gets duplicated before it (and its clone) leave the vista machine. The problem is manifested even when using other tools for injecting packets using libpcap (namely PlayCap). Any ideas?

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• MySQLdb not INSERTING, _mysql does fine.

  - by Mad_Casual

  Okay, I log onto the MySQL command-line client as root. I then open or otherwise run a python app using the MySQLdb module as root. When I check the results using python (IDLE), everything looks fine. When I use the MySQL command-line client, no INSERT has occurred. If I change things around to _mysql instead of MySQLdb, everything works fine. I'd appreciate any clarification(s). "Works" until IDLE/Virtual machine is reset: <pre><code>import MySQLdb db = MySQLdb.connect(user='root', passwd='*******',db='test') cursor = db.cursor() cursor.execute("""INSERT INTO test VALUES ('somevalue');""",)</code></end> Works: <pre><code>import _mysql db = _mysql.connect(user='root', passwd='*******',db='test') db.query("INSERT INTO test VALUES ('somevalue');")</code></end> System info: Intel x86 WinXP Python 2.5 MySQL 5.1.41 MySQL-Python 1.2.2

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• Marshal a C++ class to C#

  - by Adam Haile

  I need to access code in a native C++ DLL in some C# code but am having issues figuring out the marshaling. I've done this before with code that was straight C, but seem to have found that it's not directly possible with C++ classes. Made even more complicated by the fact that many of the classes contain virtual or inline functions. I even tried passing the headers through the PInvoke Interop Assistant, but it would choke on just about everything and not really no what to do... I'm guessing because it's not really supported. So how, if at all possible, can you use a native C++ class DLL from .NET code. If I have to use some intermediary (CLR C++?) that's fine.

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• In writing games that deal with scancodes, what do I need to know to support international keyboards

  - by sludge

  I am writing an input system for a game that needs to be able to handle keyboard schemes that are not just qwerty. In designing the system, I must take into consideration: Two types of input: standard shooter controls (lots of buttons being pressed and raw samples collected) and flight sim controls (the button's label is what the user presses to toggle something) Alternative software keyboard layouts (dvorak, azerty, etc) as supplied by the OS Alternative hardware keyboard layouts that supply Unicode characters My initial inclination is to sample the USB HID unicode scancodes. Interested on thoughts on what I need to do to be compatible with the world's input devices and recommendation of input APIs on both platforms.

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• What's wrong with my logic here?

  - by stu

  In java they say don't concatenate Strings, instead you should make a stringbuffer and keep adding to that and then when you're all done, use toString() to get a String object out of it. Here's what I don't get. They say do this for performance reasons, because concatenating strings makes lots of temporary objects. But if the goal was performance, then you'd use a language like C/C++ or assembly. The argument for using java is that it is a lot cheaper to buy a faster processor than it is to pay a senior programmer to write fast efficient code. So on the one hand, you're supposed let the hardware take care of the inefficiencies, but on the other hand, you're supposed to use stringbuffers to make java more efficient. While I see that you can do both, use java and stringbuffers, my question is where is the flaw in the logic that you either use a faster chip or you spent extra time writing more efficient software.

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• InvalidOperationException When XML Serializing Inherited Class

  - by Nick

  I am having an issue serializing a c# class to an XML file that has a base class... here is a simple example: namespace Domain { [Serializable] public class ClassA { public virtual int MyProperty { get; set; } } } namespace Derived { public class ClassA : Domain.ClassA { public override int MyProperty { get { return 1; } set { /* Do Nothing */ } } } } When I attempt to serialize an instance of Derived.ClassA, I receive the following exception: InvalidOperationException(Types 'Domain.ClassA' and 'Derived.ClassA' both use the XML type name 'ClassA', from the namespace ". Use XML attributes to specify a unique XML name and/or namespace for the type.) The problem is that I want to create a single base class that simply defines the structure of the XML file, and then allow anyone else to derive from that class to insert business rules, but that the formatting will come through from the base. Is this possible, and if so, how do I attribute the base class to allow this?

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• CrossDomain error

  - by Jayesh

  Hi, I have hosted my Silverlight application in IIS, now when I try to access the application I get the following error System.ServiceModel.CommunicationException: an error occured while trying to make request to URI This could be due to attempting to access a service in a cross-domain way without proper cross-domain policy in place, or policy that is unsuitable for SOAP services..... I have placed the cross-domain policy properly in wwwroot as well as in the virtual directory. <?xml version="1.0"?> <cross-domain-policy> <allow-http-request-headers-from domain="*" headers="*"/> </cross-domain-policy> Please help! Thanks

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• Other users on my Server?

  - by Jennifer Weinberg

  I'm buying a Server from a person (that I don't know really well) and I want to make sure that the previous owner hasn't got any access anymore. It's an Ubuntu Virtual Server and I already received the admin access (via shell). How can I find out if there are still other accounts left, who are still able to access my server (e.g. with a still existing shell account, ftp or another type of user account)? And how can I delete them if these accounts exist? Best regards, Jennifer

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• django username in url, instead of id

  - by dana

  Hello, in a mini virtual community, i have a profile_view function, so that i can view the profile of any registered user. The profile view function has as a parameter the id of the user wich the profile belongs to, so that when i want to access the profile of user 2 for example, i call it like that: http://127.0.0.1:8000/accounts/profile_view/2/ My problem is that i would like to have the username in the url, and NOT the id. I try to modify my code as follows, but it doesn't work still. Here is my code: view: def profile_view(request, user): u = User.objects.get(pk=user) up = UserProfile.objects.get(created_by = u) cv = UserProfile.objects.filter(created_by = User.objects.get(pk=user)) blog = New.objects.filter(created_by = u) replies = Reply.objects.filter(reply_to = blog) vote = Vote.objects.filter(voted=blog) following = Relations.objects.filter(initiated_by = u) follower = Relations.objects.filter(follow = u) return render_to_response('profile/publicProfile.html', { 'vote': vote, 'u':u, 'up':up, 'cv': cv, 'ing': following.order_by('-date_initiated'), 'er': follower.order_by('-date_follow'), 'list':blog.order_by('-date'), 'replies':replies }, context_instance=RequestContext(request)) and my url: urlpatterns = patterns('', url(r'^profile_view/(?P<user>\d+)/$', profile_view, name='profile_view'), thanks in advance!

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• Why is this default template parameter not allowed?

  - by Matt Joiner

  I have the following class: template <typename Type = void> class AlignedMemory { public: AlignedMemory(size_t alignment, size_t size) : memptr_(0) { int iret(posix_memalign((void **)&memptr_, alignment, size)); if (iret) throw system_error("posix_memalign"); } virtual ~AlignedMemory() { free(memptr_); } operator Type *() const { return memptr_; } Type *operator->() const { return memptr_; } //operator Type &() { return *memptr_; } //Type &operator[](size_t index) const; private: Type *memptr_; }; And attempt to instantiate an automatic variable like this: AlignedMemory blah(512, 512); This gives the following error: src/cpfs/entry.cpp:438: error: missing template arguments before ‘buf’ What am I doing wrong? Is void not an allowed default parameter?

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• What 'best practices' exist for handing enum heirarchies?

  - by FerretallicA

  I'm curious as to any solutions out there for addressing enum heirarchies. I'm working through some docs on Entity Framework 4 and trying to apply it to a simple inventory tracking program. The possible types for inventory to fall into are as follows: INVENTORY ITEM TYPES: Hardware PC Desktop Server Laptop Accessory Input (keyboards, scanners etc) Output (monitors, printers etc) Storage (USB sticks, tape drives etc) Communication (network cards, routers etc) Software What recommendations are there for handling enums in a situation like this? Are enums even the solution? I don't really want to have a ridiculously normalised database for such a relatively simple experiment (eg tables for InventoryType, InventorySubtype, InventoryTypeToSubtype etc). I don't really want to over-complicate my data model with each subtype being inherited even though no additional properties or methods are included (except PC types which would ideally have associated accessories and software but that's probably out of scope here). It feels like there should be a really simple, elegant solution to this but I can't put my finger on it. Any assistance or input appreciated!

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• ASP.NET MVC does not add ModelError when invoking from unit test

  - by Tomas Lycken

  I have a model item public class EntryInputModel { ... [Required(ErrorMessage = "Description is required.", AllowEmptyStrings = false)] public virtual string Description { get; set; } } and a controller action public ActionResult Add([Bind(Exclude = "Id")] EntryInputModel newEntry) { if (ModelState.IsValid) { var entry = Mapper.Map<EntryInputModel, Entry>(newEntry); repository.Add(entry); unitOfWork.SaveChanges(); return RedirectToAction("Details", new { id = entry.Id }); } return RedirectToAction("Create"); } When I create an EntryInputModel in a unit test, set the Description property to null and pass it to the action method, I still get ModelState.IsValid == true, even though I have debugged and verified that newEntry.Description == null. Why doesn't this work?

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• How does operating system software maintains time clocks?

  - by Neeraj

  Hi everyone, This may sound a bit less relevant but I couldn't think of a better place to ask this question. Now consider this situation, you install an OS on your system, set the timezone and time, do some stuff and turn it off. (Note that there is no power going in to the computer). Now next time (say after some hours or days) you turn it on again, and you see the updated time. How is this possible even when my computer is not connected to the internet and was consuming no power during the period it was down.(Is there some kind of hardware hack?) please clarify!

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• Dns caching for sockets

  - by Poma

  I'm connecting to some websites through socks proxy server. In my case its very good to implement dns cache, so proxy don't need to resolve website's ip address. So, I performed DNS lookup, but don't know where to supply IP address. mySocket.Connect uses proxy's ip address so it isn't right place. I tried to place it in http header GET http://11.22.33.44/index.html HTTP/1.1 - this doesn't work (even in browser) since website is on virtual hosting. It seems that Host header is right place for resolved ip address. Am I right? Will proxy resolve host name (since it's still there in GET header) or not?

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• Delphi 2010: whatever happened to TRTTIConstructor?

  - by conciliator

  I've got two questions (of which at least one is regarding RTTI in D2010 and dynamic instancing) I was reading what appears to be the foils for a conference talk by Barry Kelly, and found on p. 13 something that looked really interesting: TRTTIConstructor.Invoke. In an adjacent bullet point, on finds "Dynamically construct instances without needing virtual constructors and metaclasses". This seems like a great feature (and exactly what I need, btw)! However, when I look in the D2010 docs (ms-help://embarcadero.rs2010/vcl/Rtti.html), I can't find it. Did it get revoked? What is the minimal way of creating an instance of a class, provided the class name is stored in a string?

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• Macintosh XCode Sharing

  - by Umair Ashraf

  I got a macbook pro and I want to share it with some of my friend located at the other side of internet. He can use Internet. Now I want him to give access to my whole Macbook (XCode for most) so he can do developments at his location using my macbook. Now I need to ask is there a way we can both utilize the samme macbook having two virtual OS (one for me and one for him) without affecting each others' privacy? Is it possible to share the macbook across more than 1 user? I don't mean Remote Desktop like of thing in Windows.

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• Java bytecode compiler benchmarks

  - by Dave Jarvis

  Q.1. What free compiler produces the fastest executable Java bytecode? Q.2. What free virtual machine executes Java bytecode the fastest (on 64-bit multi-core CPUs)? Q.3. What other (currently active) compiler projects are missing from this list: http://www.ibm.com/developerworks/java/jdk/ http://gcc.gnu.org/java/ http://openjdk.java.net/groups/compiler/ http://java.sun.com/javase/downloads/ http://download.eclipse.org/eclipse/downloads/ Q.4. What performance improvements can compilers do that JITs cannot (or do not)? Q.5. Where are some recent benchmarks, comparisons, or shoot-outs (for Q1 or Q2)? Thank you!

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• Drawing individual pixels with iphone sdk.

  - by blob8108

  Hi, I've been trying to figure out how to make a powder toy style game on the iPhone. My problem is how to draw pixels to the screen. From what I've read, OpenGL is better for games as it is faster/hardware accelerated, but there is no method to draw pixels directly to the screen. Apparently drawing pixels to an off-screen frame buffer is the way to go, but how do I then pass this to OpenGL? Do I use a texture? (this is assuming I have no previous knowledge of iPhone graphics programming). Thanks!

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• how to detect grid view empty cell

  - by nCdy

  how to detect grid view empty cell ? I need it for highlighting. So I made a css .RedColored { background: FF0000; } and trying to appear it to empty GV cells this way : protected virtual GridView1_RowDataBound (_sender : object, e : System.Web.UI.WebControls.GridViewRowEventArgs) : void { e.Row.Cells[0].CssClass = "wide"; foreach(i : int in [0..e.Row.Cells.Count-1]) { when(e.Row.Cells[i].Text==null) { e.Row.Cells[i].CssClass="RedColored"; } } } but my it doesn't appears to empty cells , even I've tried Text=="" , Cell[i]==null, Cell[i].ToString()=="" and nothing helped.

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• Hosting WCF on IIS5/6

  - by Pinu

  I have developed a Web service using WCF Service Application. This service application is a part of multiple projects. we have data access , services(business logic) , testing(to test class) and WCF Service application.Where WCF Service application is just like an infterface and all the request are sent to the services project. so all the projects communicate with each other. I am new to hosting WCF application. Now to host this on IIS do i have to put the whole project in the IIS virtual directory?

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• Redirect away from HTTPS with ASP.NET MVC App

  - by Amadiere

  I'm using ASP.NET MVC 2 and have a login page that is secured via HTTPS. To ensure that the user always accesses those pages via SSL, I've added the attribute [RequiresHttps] to the controller. This does the job perfectly. When they have successfully logged in, I'd like to redirect them back to HTTP version. However, there isn't a [RequiresHttp] attribute and I'm struggling to get my head around how I might achieve this. The added (potential) complication is that the website when in production is hosted at the route of the domain, but for development and testing purposes it is within a sub directory / virtual directory / application. Am I over-thinking this and is there an easy solution staring me in the face? Or is it a little more complex?

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• NHibernate Collection Mapping - Read Only Properties

  - by Chris Meek

  I have the following class public class Person { private IList<Person> _children; public IEnumerable<Person> Children { get; } public void AddChild(Person child) { // Some business logic and adding to the internal list } } What changes would I have to make for NHibenrate to be able to persist the Child collection (apart from making everything virtual, I know that one). Do I have to add a setter to the children property which does something like a _children.Clear(); _children.AddRange(value). Currently the model expresses my intent quite nicely but I'm not sure how much alteration is need for NH to be able to help me out with persistence.

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• Why is the modal dialog in MFC actually internally modeless?

  - by pythiyam

  This question arose in my miind after reading this article: http://www.codeproject.com/Articles/3911/The-singular-non-modality-of-MFC-modal-dialogs. He mentions that the modal dialog in MFC is not strictly modal, but implemented as a modeless dialog(internally) with bells and whistles to make it behave as a modal one. Specifically, he says: The MFC command routing mechanism uses a combination of message maps and virtual functions to achieve what it does and a true modal dialog will totally wreck this mechanism because then the modal message loop is controlled outside the scope of the MFC command routing machinery Could anyone elucidate this statement? An example of what would have gone wrong if they had tried to implement a truly modal dialog would greatly clear things up.

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• HTC Hero Mouse Ball click not working on Custom ListView?

  - by UMMA

  dear friends, i have created custom list view using class EfficientAdapter extends BaseAdapter implements { private LayoutInflater mInflater; private Context context; public EfficientAdapter(Context context) { mInflater = LayoutInflater.from(context); this.context = context; } public View getView(final int position, View convertView, ViewGroup parent) { ViewHolder holder; convertView = mInflater.inflate(R.layout.adaptor_content, null); convertView.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { } }); } and other necessary methods... also } using touch screen when i click on list item OnClickListener of list item is called. but when i use Mouse Ball / Track Ball (Phone Hardware) to click on ListItem OnClickListener of list item is not called. can any one guide me is this Phone bug or My Fault? any help would be appriciated.

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• Visual Studio 2008. MFC event wizard broken

  - by G Forty

  OK, so it's almost a programming question - The VS2008 dialog event wizard has stopped working. Double-clicking on a button in an MFC dialog project does not fire the wizard as usual and a right-click to get to the 'Add Event Handler...' shows a dialog with no message types. Further to this the MFC message mapping and virtual class listing that generally appears in the properties window (Alt + Enter) is now empty. Has anyone elese seen this and if so, how'd they fix it? I have 'repaired' my VS08 installation ... Thx++ Jerry

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