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• How to know my wireless card has injection enabled?

  - by shrimpy

  I am playing around with aircrack. And was trying to see whether my wireless card on my laptop can pass the injection test And I end up seeing the following... does it mean my wireless card is not able to run aircrack? root@myubuntu:/home/myubuntu# iwconfig lo no wireless extensions. eth0 no wireless extensions. eth1 IEEE 802.11bg ESSID:"" Nickname:"" Mode:Managed Frequency:2.437 GHz Access Point: Not-Associated Bit Rate:54 Mb/s Tx-Power:24 dBm Retry min limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=5/5 Signal level=0 dBm Noise level=-57 dBm Rx invalid nwid:0 Rx invalid crypt:781 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0 root@myubuntu:/home/myubuntu# aireplay-ng -9 eth1 ioctl(SIOCSIWMODE) failed: Invalid argument ARP linktype is set to 1 (Ethernet) - expected ARPHRD_IEEE80211, ARPHRD_IEEE80211_FULL or ARPHRD_IEEE80211_PRISM instead. Make sure RFMON is enabled: run 'airmon-ng start eth1 <#>' Sysfs injection support was not found either. root@myubuntu:/home/myubuntu#

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• Get Average Using LINQ

  - by obautista

  Hoping someone can help me with the LINQ syntax to calculate an average. For example, I have the following LINQ query: var rates = from rating in ctx.Rates where rating.Id == Id select new { UserId = rating.UserId, Rating = rating.Rating }; If 10 records are returned, I need to calculate average on the Rating field. It is defined as as a Double in my DB. I am using LINQ to EF. So I would be assigning the UserId, MiscId, and the Rating would be the average on the records returned. I am passing one object back to the client code.

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• AS3: creating a class with multiple and optional parameters?

  - by redconservatory

  I'm creating a slideshow where each slide can have: - a video or a still - 1 audio track or many (up to 3) - 1 button or many (up to 3) I was thinking that each slide can be it's own object, and then I would pass the video, audio, buttons, etc., into it as parameters: package { import flash.media.Video; public class Section { public function Section (video:Video, still:myPhotoClass, audiotrack:Sound, button:myButtonClass) { // can have video OR a still // can have 1 audio track or several // can have 1 button or more } } I'm not sure how to go about approaching this since there can be multiples of certain items (audio, buttons) and also two items are sort-of-optional in the sense that there can be ONE or the OTHER (video/still). For example, is this something that I should just avoid passing as parameters altogether, using a different approach (getters/setters, maybe)?

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• How do set default values in django for an HttpRequest.GET?

  - by Mike

  I have a webpage that displays data based on a default date. The user can then change their view of the data by slecting a date with a date picker and clicking a submit button. I already have a variable set so that if no date is chosen, a default date is used.... so what's the problem? The problem comes if the user trys to type in the url page without a parameter... like so: http://mywebpage/viewdata (example A) instead of http://mywebpage/viewdata?date= (example B) I tried using: if request.method == 'GET': but apparently, even example A still returns true. I'm sure I'm doing some obvious beginner's mistake but I'll ask anyway... Is there a simpler way to handle example A other than passing the url to a string and checking the string for "?date="?

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• Extracting public key from private key in OpenSSL

  - by ereOn

  Hello, I need to extract the RSA public key from a RSA private key using OpenSSL. I'm currently using RSAPublicKey_dup() passing the RSA* private key to get the public key. However, while the call seems to work, I cannot load (or use) this public key using the openssl command-line tool. If I generate the public key using the command-line tool ("$ openssl rsa -in private.pem -pubout > public.pem"), I can use it and it works like a charm. Do you guys know how I can get this work ? Maybe another function ? The OpenSSL documentation is quite hard to browse... Thank you.

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• Set the path for the location of media files in program

  - by Zaheer Boovaji

  I have made a Java Swing Desktop application in Netbeans which can play media files I have put the videos in my workspace resources location and in my java program I am calling those media files using an URL which is something like this: C:/users/Dell/My Documents /NetBeansProjects/Media/src/resources/ MediaFiles/ddd.mpg This works well when I run in my IDE and also i have made Jar for this it works well on my computer but the problem is when i copy this jar file on my friends system the interface is coming but when I click a button to play a media file it says: C:/users/Dell/MyDocuments/NetBeansProjects/Media/src/resources/ MediaFiles/ddd.mpg does not exist So, please provide me a solution of how to set the default path so that when I run a jar file on other systems it should play the media file location I am passing as in my program. How to set the path for the location of media files in program? Update The videos are in the jar file.

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• Filtering results and pagination

  - by alj

  I have a template that shows a filter form and below it a list of the result records. I bind the form to the request so that the filter form sets itself to the options the user submitted when the results are returned. I also use pagination. Using the code in the pagination documentation means that when the user clicks for the next page, the form data is lost. What is the best way of dealing with pagination and filtering in this way? Passing the querystring to the paginiation links. Change the pagination links to form buttons and therefore submit the filter form at the same time, but this assumes that the user hasn't messed about with the filter options. As above but with the original data as hidden fields. ALJ

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• A c# Generics question involving Controllers and Repositories

  - by UpTheCreek

  I have a base repository class which contains all the common repository methods (as generic): public abstract class BaseRepository<T, IdType> : IBaseRepository<T, IdType> My repositories from this base e.g.: public class UserRepository : BaseRepository<User, int>, IUserRepository I also have a base controller class containing common actions, and inherit from this in controllers. The repository is injected into this by DI. E.g. public class UserController : BaseController<User> { private readonly IUserRepository userRepository; public UserController (IUserRepository userRepository) { this.userRepository= userRepository; } My question is this: The base controller needs to be able to access the repository methods that are defined in the base repository. However I'm passing in via DI a different repository type for each controller (even though they all inherrit from the base repository). How can the base controller somehow access the repository that is passed in (regardless of what type it is), so that it can access the common base methods?

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• 2 Classes need each other declared C++

  - by Prodigga

  I have a "Game" class which holds all the games settings and manages the game. I have a "Grid" class which is the grid the game is played on. The "Game" class initializes a "Grid" object as one of its members (passing itself ("this") as one of the parameters for "Grid"s constructor).. The "Grid" object therefor needs to deal with a "Game*" pointer. To do this it needs to know what "Game" is; i need to declare it before "Grid". But "Game" uses "Grid"...so it also needs "Grid" declared before it. so confused on how to include headers/etc correctly here..

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• Do I need multiple template specializations if I want to specialize for several kinds of strings?

  - by romkyns

  For example: template<typename T> void write(T value) { mystream << value; } template<> void write<const char*>(const char* value) { write_escaped(mystream, value); } template<> void write<char*>(char* value) { write_escaped(mystream, value); } template<> void write<std::string>(std::string value) { write_escaped(mystream.c_str(), value); } This looks like I'm doing it wrong, especially the two variants for const and non-const char*. However I checked that if I only specialize for const char * then passing a char * variable will invoke the non-specialized version, when called like this in VC++10: char something[25]; strcpy(something, "blah"); write(something); What would be the proper way of doing this?

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• Storing datetime in database?

  - by Curtis White

  I'm working on a blog and want to show my posts in eastern time zone. i figured that storing everything UTC would be the proper way. This creates a few challenges though: I have to convert all times from UTC to Eastern. This is not a biggie but adds a lot of code. And the "biggie" is that I use a short-date time to reference the posts by passing in a query, ala blogger. The problem is that there is no way to convert the short date time to the proper UTC date because I'm lacking the posted time info. Hmm, any problem to just storing all dates in eastern time? This would certainly make it easier for the rest of the application but if I needed to change time zones everything would be stored wrong.

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• Is there a RAR extractor (for multiple rar files like .r00 etc.) that will use all of my quad cores?

  - by Christopher Done

  I've got a quad core Intel processor. I've got a big file split into little ones as RAR files, foo.r00, foo.r01, etc. which the RAR program extracts into one file/directory. Is there a RAR program that I can specify like "use four cores" in the extract process? At the moment it sits there using 100% of one core. I recognise the bottleneck might be my hard drive anyway, but I don't see a lot of HD usage and suspect the decompression process is more intensive than waiting on I/O. For example, GNU Make accepts a (-j, I think) argument to tell it how many cores to use, which I used to compile PHP 6 really quickly.

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• How to set the application path to the running program?

  - by Y_Y

  Hello, I have a program that is executed by another program. The program that is being executed needs files located at its own location [same folder]. If I call myfile.open("xpo.dll") I might get an error because I am not passing the [fullpath + name + extension]. The program that is being executed can vary paths depending on the installation path. Therefore, I was wondering if there is a way to get the application path [where the application is located] and set it so that when another program executes from another path everything might work properly...? [Using C++ without .NET Framework] Thanks.

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• Is there a way to use template specialization to separate new from new[]?

  - by Marlon

  I have an auto pointer class and in the constructor I am passing in a pointer. I want to be able to separate new from new[] in the constructor so that I can properly call delete or delete[] in the destructor. Can this be done through template specialization? I don't want to have to pass in a boolean in the constructor. template <typename T> class MyAutoPtr { public: MyAutoPtr(T* aPtr); }; // in use: MyAutoPtr<int> ptr(new int); MyAutoPtr<int> ptr2(new int[10]);

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• Is the a pattern for iterating over lists held by a class (dynamicly typed OO languages)

  - by Roman A. Taycher

  If I have a class that holds one or several lists is it better to allow other classes to fetch those lists(with a getter) or to implement a doXList/eachXList type method for that list that take a function and call that function on each element of the list contained by that object. I wrote a program that did a ton of this and I hated passing around all these lists sometimes with method in class a calling method in class B to return lists contained in class C, B contains a C or multiple C's (note question is about dynamically typed OO languages languages like ruby or smalltalk) ex. (that came up in my program) on a Person class containing scheduling preferences and a scheduler class needing to access them.

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• No-overflow cast on x64

  - by Cheeso

  I have an existing C codebase that works on x86. I'm now compiling it for x64. What I'd like to do is cast a size_t to a DWORD, and throw an exception if there's a loss of data. Q: Is there an idiom for this? Here's why I'm doing this: A bunch of Windows APIs accept DWORDs as arguments, and the code currently assumes sizeof(DWORD)==sizeof(size_t). That assumption holds for x86, but not for x64. So when compiling for x64, passing size_t in place of a DWORD argument, generates a compile-time warning. In virtually all of these cases the actual size is not going to exceed 2^32. But I want to code it defensively and explicitly. This is my first x64 project, so... be gentle.

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• C++: Cannot convert from foo& to foo*

  - by Rosarch

  I have a method: odp(foo& bar); I'm trying to call it: foo baz; odp(&baz); I get a compiler error: error C2664: "odp" cannot convert parameter 1 from 'foo *' to 'foo &' What am I doing wrong? Aren't I passing in a reference to baz? UPDATE: Perhaps I have a misconception about the relationship between pointers and references. I thought that they were the same, except references couldn't be null. Is that incorrect?

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• Is it okay to pass injected EntityManagers to EJB bean's helper classes and use it?

  - by Zwei steinen

  We have some JavaEE5 stateless EJB bean that passes the injected EntityManager to its helpers. Is this safe? It has worked well until now, but I found out some Oracle document that states its implementation of EntityManager is thread-safe. Now I wonder whether the reason we did not have issues until now, was only because the implementation we were using happened to be thread-safe (we use Oracle). @Stateless class SomeBean { @PersistenceContext private EntityManager em; private SomeHelper helper; @PostConstruct public void init(){ helper = new SomeHelper(em); } @Override public void business(){ helper.doSomethingWithEm(); } } Actually it makes sense.. If EntityManager is thread-unsafe, a container would have to do inercept business() this.em = newEntityManager(); business(); which will not propagate to its helper classes. If so, what is the best practice in this kind of a situation? Passing EntityManagerFactory instead of EntityManager?

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• Unit testing a controller in ASP.NET MVC 3

  - by Abdullah Al- Mansur

  public Double Invert(Double? id) { return (Double)(id / id); } I have done this for this test but fails please can anyone help with this cos just started with unit testing /* HINT: Remember that you are passing Invert an *integer* so * the value of 1 / input is calculated using integer arithmetic. * */ //Arrange var controller = new UrlParameterController(); int input = 7; Double expected = 0.143d; Double marginOfError = 0.001d; //Act var result = controller.Invert(input); //Assert Assert.AreEqual(expected, result, marginOfError); /* NOTE This time we use a different Assert.AreEqual() method, which * checks whether or not two Double values are within a specified * distance of one another. This is a good way to deal with rounding * errors from floating point arithmetic. Without the marginOfError * parameter the assertion fails. * */

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• What is the best way to detect Copy (Ctrl+C) event in an IWpfTextView?

  - by Nick U

  I am trying to detect a copy event in the text view and I have been researching the best way to do this. Is it to possibly hook into the StandardCommand Copy event somehow and detect it that way? Or is it possible to use the KeyProcessor(and simply detect Ctrl+C keypresses)? My extension is currently implementing the IWpfTextViewCreationListener; is there a way to somehow get access to the KeyProcessor or StandardCommand from the IWpfTextView that the listener is passing to me? If so, can you post a code sample that demonstrates this? Thanks, Nick

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• Can a rake task know about the other tasks in the invocation chain?

  - by andrewdotnich

  Rake (like make) is able to have many targets/tasks specified on invocation. Is it possible for a rake task to access the list of tasks the user invoked, in order to do its job? Scenario: Consider a Rake-based build tool. A help task would like to know what tasks were also specified in order to print their usage and halt the build process. The benefit of this as opposed to rake-style parameter passing are cleaner syntax (rake help build instead of rake help task=build) and chaining (rake help build run_tests would print usage for both).

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• Redeclaration of parameters

  - by Scott

  While looking through the Selenium source code I noticed the following in the PageFactory: public static <T> T initElements(WebDriver driver, Class<T> pageClassToProxy) { T page = instantiatePage(driver, pageClassToProxy); initElements(driver, page); return page; } public static void initElements(WebDriver driver, Object page) { final WebDriver driverRef = driver; initElements(new DefaultElementLocatorFactory(driverRef), page); } What is the benefit of having the following line? final WebDriver driverRef = driver; Wouldn't it have made sense to just make the parameter final, and then passing that along to the next method without declaring the new reference?

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• Using a locale-dependent sorting function in Ruby/Rails

  - by knuton

  What is a good approach to sorting an array of strings in accordance with the current locale? For example the standard Array#sort puts "Ä" after "Z", which is not correct in German. I would have expected the gem I18n to offer a hook for defining my own sorting algorithms or providing collation strings or objects. In my imagination, passing this proc or string to the sort function, would make it behave as necessary. I know that this is possible in Python, for example. Google has not helped me this time. Can you? Any advice appreciated!

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• Ruby/RoR: calling original method via super()?

  - by fearless_fool

  In a RoR app, I want to specialize ActiveRecord's update_attributes() method in one of my models, extracting some of the attributes for special handling and passing the rest of them to the original update_attributes() method. The details: class Premise < ActiveRecord::Base ... def update_attributes(attrs) attrs.each_pair do |key, val| unless has_attribute?(key) do_special_processing(key, val) attrs.delete(key) end end # use original update_attributes() to process non-special pairs super.update_attributes(attrs) end ... end The call to super.update_attributes(attr) raises an error: undefined method `update_attributes' for true:TrueClass ... which makes me suspect I really don't understand the super keyword in Ruby. What am I missing? Specifically, how do I call the original update_attributes() method?

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• How to pass json via a form element

  - by becomingGuru

  I have this swf (flash) file that provides the json that needs to be sent to the server. I wrote a very simple jQuery: function submitForm(swf_json) { $('#swfjson').val(swf_json); #swfjson is an input of type hidden $('#titleForm').submit(); } and the swf will call the submitForm above and I receive the request.POST in django as usual. But, django is interpreting the swf_json as a string "Object object" >>>type(request.POST['swfjson']) <type 'unicode'> Of course I can pass the json as a string to the view function. Doesn't seem good to me. Any other way of passing the json object to the django view?

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