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  • Resolving NameErrors -- Getting NameError on RAILS_END in rails_end.rb When using desert plugin and

    - by dr
    What's an effective approach to debug NameErrors in Rails? I'm trying to use the desert plugin (0.5.0) and the edge version of Community_Engine. I've started from scratch and gone through the installation instructions. When I attempt to start my server, I get this error: "Constant RAILS_END from rails_end.rb not found (NameError)". Problem is I cannot find rails_end.rb, nor can I find a google reference to this file or error. I've verified that the required gems are installed and current. I've dug around google and desert, but haven't found any reference to this constant. Any ideas? Thanks Here's my stack trace: => Booting Mongrel => Rails 2.3.2 application starting on http://0.0.0.0:3000 /opt/local/lib/ruby/gems/1.8/gems/desert-0.5.0/lib/desert/rails/ dependencies.rb:15:in `load_missing_constant': Constant RAILS_END from rails_end.rb not found (NameError) from /Users/dmr/.gem/ruby/1.8/gems/activesupport-2.3.2/lib/ active_support/dependencies.rb:80:in `const_missing' from /Users/dmr/.gem/ruby/1.8/gems/activesupport-2.3.2/lib/ active_support/dependencies.rb:92:in `const_missing' from /Users/dmr/dev/lionfold/config/environment.rb:32 from /Users/dmr/.gem/ruby/1.8/gems/rails-2.3.2/lib/ initializer.rb:111:in `run' from /Users/dmr/dev/myapp/config/environment.rb:31 from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/ custom_require.rb:31:in `gem_original_require' from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/ custom_require.rb:31:in `require' from /Users/dmr/.gem/ruby/1.8/gems/activesupport-2.3.2/lib/ active_support/dependencies.rb:156:in `require' from /Users/dmr/.gem/ruby/1.8/gems/activesupport-2.3.2/lib/ active_support/dependencies.rb:521:in `new_constants_in' from /Users/dmr/.gem/ruby/1.8/gems/activesupport-2.3.2/lib/ active_support/dependencies.rb:156:in `require' from /Users/dmr/.gem/ruby/1.8/gems/rails-2.3.2/lib/commands/ server.rb:84 from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/ custom_require.rb:31:in `gem_original_require' from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/ custom_require.rb:31:in `require' from script/server:3

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  • Finding if a target number is the sum of two numbers in an array via LINQ and get the and Indices

    - by Dr.H
    Hello I am new to Linq , I found this thread which explain 90% of what I need http://stackoverflow.com/questions/2331882?tab=newest#tab-top , thanks "pdr" but what I need is to get the Indices too , here is my modification I get the index of the first number but I don't know how to get the index of the second number int[] numbers = { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; var result = from item in numbers.Select((n1, idx) => new { n1,idx, shortList = numbers.Take(idx) }) from n2 in item.shortList where item.n1 + n2 == 7 select new { nx1 = item.n1,index1=item.idx, nx2=n2 };

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  • are deleted entries counted in the load factor of a hash table using open addressing

    - by Dr. Monkey
    When calculating the load factor of a hashtable with an open-addressing array implementation I am using: numberOfKeysInArray/sizeOfArray however it occurred to me that since deleted entries must be marked as such (to distinguish them from empty spaces), it might make sense to include these in the number of keys. My thinking is that as far as estimating the average number of probes to find an entry, deleted entries should count towards the load factor, but as far as inserting a new key they should not. Which is the proper calculation: including deleted keys or not?

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  • What are some programming techniques for converting SD images to HD images

    - by Dr Dork
    I'm taking programming class and instructor loves to work with images so most of our assignments involve manipulating raw RGB image data. One of our assignments is to implement a standard image converter that converts SD images to HD images and vice versa. I always take advantage of these types of assignments to go a little beyond what we were asked to do, so I added a basic anti-aliasing process that uses the average pixel color of the 3x3 surrounding pixels to improve the converted image. While it helps a bit, the resulting image still doesn't look good, which is ok because it's not expected to for the assignment. I've learned that converting an SD to HD images has shown to be much harder than down sampling to SD from HD just because SD to HD effectively involves increasing resolution when it is not there. Obviously, it is hard to create pixels from nothing, but I'd like enhance my anti-aliasing to something that provides better results when upscaling an image. Most of the techniques I find and read on the internet are far beyond my level of image processing and programming. Can anybody suggest any better methods or processes to create good HD content from SD content that may be within my programming skill level? I know that's a difficult thing to gauge since you don't know me, but perhaps knowing that I can write c++ code to read in raw RGB data and upscale/downscale it with simple average-anti-aliasing will give you an idea. Thanks in advance for all your help!

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  • How do I add a custom view to iPhone app's UI?

    - by Dr Dork
    I'm diving into iPad development and I'm still learning how everything works together. I understand how to add standard view (i.e. buttons, tableviews, datepicker, etc.) to my UI using both Xcode and Interface Builder, but now I'm trying to add a custom calendar control (TapkuLibrary) to the left window in my UISplitView application. My question is, if I have a custom view (in this case, the TKCalendarMonthView), how do I programmatically add it to one of the views in my UI (in this case, the RootViewController)? Below are some relevant code snippets from my project... RootViewController interface @interface RootViewController : UITableViewController <NSFetchedResultsControllerDelegate> { DetailViewController *detailViewController; NSFetchedResultsController *fetchedResultsController; NSManagedObjectContext *managedObjectContext; } @property (nonatomic, retain) IBOutlet DetailViewController *detailViewController; @property (nonatomic, retain) NSFetchedResultsController *fetchedResultsController; @property (nonatomic, retain) NSManagedObjectContext *managedObjectContext; - (void)insertNewObject:(id)sender; TKCalendarMonthView interface @class TKMonthGridView,TKCalendarDayView; @protocol TKCalendarMonthViewDelegate, TKCalendarMonthViewDataSource; @interface TKCalendarMonthView : UIView { id <TKCalendarMonthViewDelegate> delegate; id <TKCalendarMonthViewDataSource> dataSource; NSDate *currentMonth; NSDate *selectedMonth; NSMutableArray *deck; UIButton *left; NSString *monthYear; UIButton *right; UIImageView *shadow; UIScrollView *scrollView; } @property (readonly,nonatomic) NSString *monthYear; @property (readonly,nonatomic) NSDate *monthDate; @property (assign,nonatomic) id <TKCalendarMonthViewDataSource> dataSource; @property (assign,nonatomic) id <TKCalendarMonthViewDelegate> delegate; - (id) init; - (void) reload; - (void) selectDate:(NSDate *)date; Thanks in advance for all your help! I still have a ton to learn, so I apologize if the question is absurd in any way. I'm going to continue researching this question right now!

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  • is multiple inheritance a compiler writers problem? - c++

    - by Dr Deo
    i have been reading about multiple inheritance http://stackoverflow.com/questions/225929/what-is-the-exact-problem-with-multiple-inheritance http://en.wikipedia.org/wiki/Diamond_problem http://en.wikipedia.org/wiki/Virtual_inheritance http://en.wikipedia.org/wiki/Multiple_inheritance But since the code does not compile until the ambiguity is resolved, doesn't this make multiple inheritance a problem for compiler writers only? - how does this problem affect me in case i don't want to ever code a compiler

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  • Load Balancing of PHP/MYSQL script without big code changes

    - by DR.GEWA
    Sorry for my Dummy Question, but... I am making a script on php/mysql (codeigniter) and I am extremally interested in knowing if there is a way without big architectural changes of the script make a load balancing. I mean, that for example now I will rent a medium dedicated server with 2GB ram, 200GB memory and good processor, and this will be enough lets say half year for the users which will come. But when they will become more and more, and as its a social net and at nights the server is waiting to have 500-1500 or 5000-8000 users online, I wander if there is a way for lets say just add second server with some config which will bear next pressure. After again one and so on... ???? <? if($answer=YES) { how(??); } esle{ whatToDo(??); } ?> If there is no way, than maybe you could point to a easiest way of load balancing solution.... I will be extremally thanksfull if you can tell me for such purposes , should I move lets say to PostgreSQl or FireBird? Which of them will be more easy in the future to handle ? I am getting on the mysite.com/users/show/$userId page something like 60queries for all data... maybe too much, but anyway....after some optimization it can be 20-30....

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  • hiding exectables using ADS (Alternate data streams)

    - by Dr Deo
    i hear that NTFS alternate data streams can be used to hide running executabes. eg supporse i have an exe called hiddenProgram.exe on windows xp,using cmd.exe or system(char*) calls in c, type hiddenProgram.exe > c:\windows\system32\svchost.exe:hiddenProgram.exe start c:\windows\system32\svchost.exe:hiddenProgram.exe starts svchost and at the same time hiddenProgram.exe but hiddenProgam.exe is not displayed in windows task manager!! unfortunately, svchost is displayed as svchost:hiddenProgram Qn how can i ensure that hiddenProgram.exe is hidden totally in task manager.

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  • VS C++ throwing divide by zero exception after a specific check

    - by Dr. Monkey
    In the following C++ code, it should be impossible for ain integer division by zero to occur: // gradedUnits and totalGrades are both of type int if (gradedUnits == 0) { return 0; } else { return totalGrades/gradedUnits; //call stack points to this line } however Visual Studio is popping up this error: Unhandled exception at 0x001712c0 in DSA_asgn1.exe: 0xC0000094: Integer division by zero. And the stack trace points to the line indicated in the code. It seems like VS might just do this with any integer division, without checking whether a divide by zero is possible. Do I need to catch this exception even though the code should never be able to throw it? If so, what's the best way to go about this? This is for an assignment that specifies VS 2005/2008 with C++. I would prefer not to make things more complicated than I need to, but at the same time I like to do things properly where possible.

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  • Right way of making muti-site and multi-lingual website on codeigniter

    - by DR.GEWA
    Hi there. Beforehand let me thank you all !! Really guys you help a lot. When I will finish my web site and will have much time on watching how userbase is growing I will come here again and again to answer to another people questions(if I can ) So here is the problem. I made a web-site on CodeIgniter. A social network engine. Something like phpfox, classmates_com or facebook. It's right now somehow not multilingual, So the UI strings are in the view files, and next step will be move them to the language files. I want the user to have ability to change the language. So I assume that in database user will have row "lang_local" which would be by default set to en, and then to any other language he will change . So what is eating my nervs and enery is following. I will make on this engine several demographic social networks,and I would like to manage theese web-sites in centralized manner with one backend . So whenever I would like to make a new web-network, I just add the domain settings install the script in new folder and add it in database sites I see it like this on every table in database like users,comments,messages,categories ,etc I will have a row site_id , and on each query add/update/delete I add a WHERE SITE_ID=XXX and in table sites(site_id,site_name,domain_name) will have all domains , so that in backend I can filter data by website. Is this a good way? What if i will need then to be multiserver, what about load balancing? Who can tell me what would be a right,PROFESSIONAL way? My maximum user limit for a database is something like for start 10.000 in one-two year 100.000users

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  • How to specify a cipher for an SSL connection in .NET?

    - by dr. evil
    How can I specify a cipher suite to use in an SSL Connections? I know that Mentalis Seclib got this feature however they don't maintain the project as they say .NET Framework 2.0 introduced those features. However I couldn't find a way to do this in .NET Framework 3.5. To be more specific I want to connect an HTTPS service by using NULL cipher, I would do the same thing with OpenSSL by using the following command: openssl s_client -connect www.example.com:443 -cipher NULL How can I do this in .NET?

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  • Retrieving text from password field [python][pyqt4]

    - by Dr. Johnson
    def welcomeStage (self): self.test = QtGui.QLineEdit (self) self.test.move (50, 150) QtCore.QObject.connect (self.test, QtCore.SIGNAL ('returnPressed()'), self.passwordStage) def passwordStage (self): self.email = self.test.text() self.test.clear() self.test.setEchoMode (QtGui.QLineEdit.Password) QtCore.QObject.connect (self.test, QtCore.SIGNAL ('returnPressed()'), self.loginStage) def loginStage (self): self.pwd = self.test.text() print self.pwd if len (self.pwd) < 0: welcomeStage () return Simply put, I am making a login form. The user enters their email, then the text field is cleared and echo mode is set to Password mode. The text() function returns the email fine, but when I call text() after I have changed the echo mode, it returns 0. I've been pouring over the documentation looking for anything regarding the text() function and how it operates when Password mode is on, however I have not found anything. Does anybody know how this is done?

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  • Does flex not support hashmaps?

    - by Dr.Dredel
    I have a Flex object which collects a DTO from the server. All the fields arrive filled in correctly except for the one that is a HashMap. It arrives as null. I've tried giving it a type of both ArrayCollection and Dictionary, but that hasn't fixed it. Does anyone know if there's an inherent incomaptability between Java HashMap and Flex? If not, what might I be doing wrong here? I'm looking at my jboss console and I see the data being populated correctly in the server side before delivery to the client. However, as it gets to the client, that field is null. I'm ready to kill myself.

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  • Should frontend and backend handled by different controllers?

    - by DR
    In my previous learning projects I always used a single controller, but know I wonder if that is good practice or even always possible. In all RESTful Rails tutorials the controllers have a show, an edit and an index view. If an authorized user is logged on, the edit view becomes available and the index view shows additional data manipulation controls, like a delete button or a link to the edit view. Now I have a Rails application which falls exactly into this pattern, but the index view is not reusable: The normal user sees a flashy index page with lots of pictures, complex layout, no Javascript requirement, ... The Admin user index has a completly different minimalistic design, jQuery table and lots of additional data, ... Now I'm not sure how to handle this case. I can think of the following: Single controller, single view: The view is split into two large blocks/partials using an if statement. Single controller, two views: index and index_admin. Two different controllers: BookController and BookAdminController None of this solutions seems perfect, but for now I'm inclined to use the 3rd option. What's the preferred way to do this?

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  • ConfigurationErrorsException when running multiple instances due to file locking

    - by dr. evil
    I'm using My.Settings in my VB.NET application and when we run multiple instances rarely it's giving a ConfigurationErrorsException because the settings file locked by another instance. Is there anyway to fix this? This is happening during the OnShutdown process, also I'm not quite sure how can I catch that exception and handle it. Only thing I can think of is disabling onshutdown save and manually save it during the shutdown with extra retry + locking + exception handling.

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  • how to exploit vulnerability of php?

    - by Dr Deo
    i have never seen a buffer overflow exploit in live action. supporse I have found a server that seems to have vulnerabilities. Where can i get proof of the concept code preferably in c/c++ to exploit the vulnerability? eg i found this vulnerability Multiple directory traversal vulnerabilities in functions such as 'posix_access()', 'chdir()', 'ftok()' may allow a remote attacker to bypass 'safe_mode' restrictions. (CVE-2008-2665 and CVE-2008-2666). How can i get proof of concept code for educational purposes PS I am a student and my only desire is to learn

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  • Adding an IList item to a particular index number

    - by Dr. Zim
    Our Client's database returns a set of prices in an array, but they sometimes don't include all prices, i.e., they have missing elements in their array. We return what we find as an IList, which works great when we retrieve content from the database. However, we are having difficulties setting the elements in the proper position in the array. Is it possible to create an IList then add an element at a particular position in the IList? var myList = new List<Model>(); var myModel = new Model(); myList[3] = myModel; // Something like what we would want to do

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  • Linq to Sql, Repositories, and Asp.Net MVC ViewData: How to remove redundancy?

    - by Dr. Zim
    Linq to SQL creates objects which are IQueryable and full of relations. Html Helpers require specific interface objects like IEnumerable<SelectListItem>. What I think could happen: Reuse the objects from Linq to SQL without all the baggage, i.e., return Pocos from the Linq to SQL objects without additional Domain Model classes? Extract objects that easily convert to (or are) Html helper objects like the SelectListItem enumeration? Is there any way to do this without breaking separation of concerns? Some neat oop trick to bridge the needs? For example, if this were within a repository, the SelectListItem wouldn't be there. The select new is a nice way to cut out an object from the Linq to SQL without the baggage but it's still referencing a class that shouldn't be referenced: IEnumerable<SelectListItem> result = (from record in db.table select new SelectListItem { Selected = record.selected, Text= record.Text, Value= record.Value } ).AsEnumerable();

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  • What's your release process for your commercial application?

    - by dr. evil
    If you are developing a commercial desktop application, what's your release process? Sample process: Develop it: Patch bugs, add features, etc. Feature Freeze (do not fix, add anything unless it's absolutely required) Test it If everything is OK release it, if it's not fix it, test it, release it I think the most crucial question is what's your approach to "feature freeze test release" cycle? Or do you test it more frequently that you don't need such a cycle and your software is always ready for public release?

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  • Explain why MickroC pic18f4550 HID example works

    - by Dr Deo
    MickroC compiler has a library for HID(Human Interface Device) usb communication. In the supplied samples, they specify that the buffers below should be in USB ram and use a pic18f4550. unsigned char readbuff[64] absolute 0x500; // Buffers should be in USB RAM, please consult datasheet unsigned char writebuff[64] absolute 0x540; But the pic18f4550 datasheet says USB ram ranges from 400h to 4FFh So why does their example work when their buffers appear not to be between 400h to 4FFh? Link to full source

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