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  • C struct print, decode this code?

    - by pauliwago
    I am in the process of studying for a test, and I'm trying to work through some practice problems. I've been working on this a while now..but can't figure it out. Please take a look at the code fragment: union { int i; short x; unsigned short u; float f; } testout; testout.i=0xC0208000; Before I ask the question, can someone please explain to me how the above code works?? My guess is that testout.i=0xC0208000 puts either an int, short, unsigned short, or float and puts the result in that address. (?) The question is what prints out if we write printf("%d", testout.x)? I know we should expect digits....but I have no idea where they are getting the digits from....there is no output. Any explanation would be greatly appreciated. Thanks!

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  • JSON Syntax, what is this?

    - by danp
    I understand concepts of JSON ok, but after starting to use ebay's api, I came across a notation which I've not seen before, and was wondering if anyone could explain what's going on with it? { "findItemsByKeywordsResponse": [ { "ack": [ "Success" ], "version": [ "1.5.0" ], "timestamp": [ "2010-06-16T08:42:21.468Z" ], "searchResult": [ { "@count": "0" } ], "paginationOutput": [ { "pageNumber": [ "0" ], "entriesPerPage": [ "10" ], "totalPages": [ "0" ], "totalEntries": [ "0" ] } ] } ] } What's the "@count" thing? I noticed when I reference it in chrome, it throws an error: But in Firefox not. JSON Lint reports it's valid, as I'd expect... ;)

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  • Access USB devices through Delphi in Windows XP standard

    - by Lex Dean
    I'm into pis18f's and Delphi Support out their is for everything but Delphi from my point of view as a hobbyist and many like me Delphi connecting to a pic's has many advantages I write in Mikro Pascal I'm fully familiar with MSDN and connecting to windows The small/medium programs out their made in Delphi is enormous think what that can do for pics. This project needs to me written to connect to old windows XP in kernel mode I think and not SP2 or SP3 dependent as thats all you can buy now. I would like it to be a Delphi DCU file for delphi simplisity But I expect some how it to be a DLL in the end. Can any one out their help me with any advice please Email:- lexdeanair At hotmail.com

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  • How should I deal with sqlite errors?

    - by Dustin
    I have a long running application written in a mix of C and C++ that stores data in sqlite. While I am confident that committed data will remain available (barring mechanical failure) and uncommitted data will not be, it's not clear to me what I can do with this sort of middle state. I do a large number of inserts in a transaction and then commit it. When an error occurs on a given statement, I can schedule it to be attempted at some point in the future. It sounds like some errors might implicitly rollback my transaction (which would be undesirable if true). A larger problem is what happens when my commit itself fails. Currently, I'm just going to continue to retry it until it works. I would expect that whatever would cause my commit to fail may very well also cause a rollback to fail. What is the recommended mechanism for error handling in such a situation?

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  • Need advice on cron job'ing a very large process

    - by Arms
    I have a PHP script that grabs data from an external service and saves data to my database. I need this script to run once every minute for every user in the system (of which I expect to be thousands). My question is, what's the most efficient way to run this per user, per minute? At first I thought I would have a function that grabs all the user Ids from my database, iterate over the ids and perform the task for each one, but I think that as the number of users grow, this will take longer, and no longer fall within 1 minute intervals. Perhaps I should queue the user Ids, and perform the task individually for each one? In which case, I'm actually unsure of how to proceed. Thanks in advance for any advice.

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  • Why did the following linq to sql query generate a subquery?

    - by Xaisoft
    I did the following query: var list = from book in books where book.price > 50 select book; list = list.Take(50); I would expect the above to generate something like: SELECT top 50 id, title, price, author FROM Books WHERE price > 50 but it generates: SELECT [Limit1].[C1] as [C1] [Limit1].[id] as [Id], [Limit1].[title] as [title], [Limit1].[price] as [price], [Limit1].[author] FROM (SELECT TOP (50) [Extent1].[id] as as [Id], [Extent1].[title] as [title], [Extent1].[price] as [price], [Extent1].[author] as [author] FROM Books as [Extent1] WHERE [Extent1].[price] > 50 ) AS [Limit1] Why does the above linq query generate a subquery and where does the C1 come from?

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  • How do I get the sequence of numbers in a sorted-set that are between two integers in clojure?

    - by Greg Rogers
    Say I have a sorted-set of integers, xs, and I want to retrieve all the integers in xs that are [x, y), ie. between x and y. I can do: (select #(and (>= % x) (< % y)) xs) But this is inefficient - O(n) when it could be O(log n), I expect the number of elements returned to be small. Using take-while and drop-while would let me exit once I've reached y, but I still can't jump to x efficiently. I am just learning clojure so here is how I would do it in C++: set<int>::iterator first = xs.lower_bound(x); set<int>::iterator last = xs.lower_bound(y); for (; first != last; ++first) // do something with *first Can I do this in clojure?

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  • C#/XNA Giant Memory Leak

    - by user1440926
    this is my first post here. I'm making a game in Visual Studio 2010 using XNA, and i've hit a giant memory leak. My game starts out using 17k ram and then after ten minutes it's upto 65k. I ran some memory profilers, and they all say that new instances of the String object are being created, but they aren't live. The amount of live instances of String hasn't changed at all. It's also creating instances of Char[] (which i'd expect from it), Object[], and StringBuilder. My game is pretty new but there's too much code to post here. I have no idea how to get rid of instances that aren't live, please help!

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  • Are C++ Templates just Macros in disguise?

    - by Roddy
    I've been programming in C++ for a few years, and I've used STL quite a bit and have created my own template classes a few times to see how it's done. Now I'm trying to integrate templates deeper into my OO design, and a nagging thought keeps coming back to me: They're just a macros, really... You could implement (rather UGLY) auto_ptrs using #defines, if you really wanted to. This way of thinking about templates helps me understand how my code will actually work, but I feel that I must be missing the point somehow. Macros are meant evil incarnate, yet "template metaprogramming" is all the rage. So, what ARE the real distinctions? and how can templates avoid the dangers that #define leads you into, like Inscrutable compiler errors in places where you don't expect them? Code bloat? Difficulty in tracing code? Setting Debugger Breakpoints?

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  • SSAS Reporting Services - Set specific language / translation

    - by Chris
    Hi all, in the data warehouse there's a default language for the measures, and I added a translation for German captions. In a Visual Studio Report Server project, when creating a query with my German OS, the cube and its measures are displayed in German language. When dragging measures to the mdx query windows, the default measure name is used. That's what I want and what I expect, since when writing MDX queries I would like to use the default measure names. But when executing the query, the columns created for each measure is translated to German again. This resuls in having German columns names within my dataset, which I dont want. I'd like to have the english column names. I already tried to change the connection string to: Data Source=server;Initial Catalog=DataWarehouse;LocaleIdentifier=1033 But that doesn't help, I still see German translations. Anyone knows how to set a specific translation?

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  • PHP: How do I access child properties from a method in a base object?

    - by Nick
    I'd like for all of my objects to be able to return a JSON string of themselves. So I created a base class for all of my objects to extend, with an AsJSON() method: class BaseObject { public function AsJSON() { $JSON=array(); foreach ($this as $key = $value) { if(is_null($value)) continue; $JSON[$key] = $value; } return json_encode($JSON); } } And then extend my child classes from that: class Package extends BaseObject { ... } So in my code, I expect to do this: $Box = new Package; $Box-SetID('123'); $Box-SetName('12x8x6'); $Box-SetBoxX('12'); $Box-SetBoxY('8'); $Box-SetBoxZ('6'); echo $Box-AsJSON(); But the JSON string it returns only contains the BaseClass's properties, not the child properties. How do I modify my AsJSON() function so that $this refers to the child's properties, not the parent's?

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  • session variable not available in global before(:each, :type => :controller)

    - by Rob
    Hi, I'm refactoring some specs, in controller specs I have a before(:each) which sets up things required in the session my before filter is... config.before(:each, :type => :controller) do ... session[:current_user] = @user session[:instance] = @instance ... end @user and @instance are also set in the before(:each) i've just hidden them for readability here I get the following error when running the controller tests undefined method `session' for nil:NilClass I would expect the global before callbacks to have the same things as the ones in the individual tests but I guess maybe they are loaded before the rails environment has been initialised? Thanks

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  • How to get correct table format ? Jquery ques..

    - by Sakti
    This code prints output as given below... code: $('#calendar').append('<table><thead><tr>'); var i; for(i=0;i<=6;i++) { $('#calendar').append('<td>'+week[i]+'</td>'); } $('#calendar').append('</tr></thead>'); $('#calendar').append('</table>'); output: <section id="calendar"><table><thead><tr></tr></thead></table><td>Sunday</td><td>Monday</td><td>Tuesday</td><td>Wednesday</td><td>Thursday</td><td>Friday</td><td>Saturday</td></section> But i expect something in this structure.. <table><thead><tr><td>...</td></tr></thead></table>

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  • Rails 3 ActiveRecord group_by sort by count

    - by Craig
    The following view code generates a series of links with totals (as expected): <% @jobs.group_by(&:employer_name).sort.each do |employer, jobs| %> <%= link_to employer, jobs_path() %> <%= "(#{jobs.length})" %> <% end %> However, when I refactor the view's code and move the logic to a helper, the code doesn't work as expect. view: <%= employer_filter(@jobs_clone) %> helper: def employer_filter(jobs) jobs.group_by(&:employer_name).sort.each do |employer,jobs| link_to employer, jobs_path() end end The following output is generated: <Job:0x10342e628>#<Job:0x10342e588>#<Job:0x10342e2e0>Employer A#<Job:0x10342e1c8>Employer B#<Job:0x10342e0d8>Employer C#<Job:0x10342ded0>Employer D# What am I not understanding? At first blush, the code seems to be equivalent.

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  • Filtering with joined tables

    - by viraptor
    I'm trying to get some query performance improved, but the generated query does not look the way I expect it to. The results are retrieved using: query = session.query(SomeModel). options(joinedload_all('foo.bar')). options(joinedload_all('foo.baz')). options(joinedload('quux.other')) What I want to do is filter on the table joined via 'first', but this way doesn't work: query = query.filter(FooModel.address == '1.2.3.4') It results in a clause like this attached to the query: WHERE foos.address = '1.2.3.4' Which doesn't do the filtering in a proper way, since the generated joins attach tables foos_1 and foos_2. If I try that query manually but change the filtering clause to: WHERE foos_1.address = '1.2.3.4' AND foos_2.address = '1.2.3.4' It works fine. The question is of course - how can I achieve this with sqlalchemy itself?

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  • update value of a variable outside a class in VB.NET

    - by dpp
    I have a class derived from a Form, it has textbox for username and password and an OK button. I want it to behave like an InputBox so I can use it like this: Dim Username As String = "" Dim Password As String = "" Dim authorization As New Authorization(Username, Password) authorization.ShowDialog() 'The user will click OK and I will expect the Username and Password to change based on the user input MsgBox(Username & " " & Password) The Authorization class: Public Class Authorization Dim RefUsername As String Dim RefPassword As String Public Sub New(ByRef Username As String, ByRef Password As String) InitializeComponent() RefUsername = Username 'I'm trying to pass reference instead of value RefPassword = Password 'I'm trying to pass reference instead of value End Sub Private Sub OKButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AuthorizeButton.Click RefUsername = Username.Text 'I'm trying to change value of variable outside the class RefPassword = Password.Text 'I'm trying to change value of variable outside the class Me.Close() End Sub End Class In short, I want to change the value of variables outside the class when the user clicks the OK, how am I going to accomplish that?

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  • In C#: How to declare a generic Dictionary whose key and value types have a common constraint type?

    - by Marcel
    Hi all, I want to declare a dictionary that stores typed IEnumerable's of a specific type, with that exact type as key, like so: private IDictionary<T, IEnumerable<T>> _dataOfType where T: BaseClass; //does not compile! The concrete classes I want to store, all derive from BaseClass, therefore the idea to use it as constraint. The compiler complains that it expects a semicolon after the member name. If it would work, I would expect this would make the later retrieval from the dictionary simple like: IEnumerable<ConcreteData> concreteData; _sitesOfType.TryGetValue(typeof(ConcreteType), out concreteData); How to define such a dictionary?

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  • With vim, how can I use autocmd's for files in subdirectories of a specific path?

    - by René Nyffenegger
    I am trying to figure out how I can define an autocmd that influences all files under a specific path. The autocmd I have tried is something like autocmd BufNewFile,BufRead /specificPath/** imap <buffer> .... Now, I'd expect this autocmd to be used if I edited, say, /foo/bar/specificPath/baz/something/bla.txt, but not if I edited /foo/bar/here/and/there/moreBla.txt If I start vim being in a directory 'above' specificPath, this works as I want it. But it doesn't if I am below that directory. Obviously, the autocmd's pattern is matched against the relative file name, not the absolute one.

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  • Is the situation with Java ME improving?

    - by mike g
    It seems to be the consensus that developing for Java ME is not as cross platform as you might expect, particularly compared to say java SE, but it is difficult to assess how the situation is evolving. Is the situation improving significantly? Are problematic implementations being patched? Are problematic implementations dying out as a proportion of mobile devices? Is the tool chain improving? Are there ways to identify at least some cross platform 'errors' without necessarily deploying to each and every device?

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  • Android App Support Options

    - by Pughjl
    I've got a free app I'm planning on submitting to the marketplace. Looking over the submission form I see they expect a web site or email for support. Users?! I've got to worry about users if I submit an app? I suppose I would like to get some abuse from users, but I don't want to go broke doing it. So what are my options? I have a web site--I suppose I could install forum software on it--that sounds like a lot of work though. Some apps reference a blogspot page--or I could use my Word Press site. They seems a bit disorganized for getting user feedback though.

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  • How detect length of a numpy array with only one element?

    - by mishaF
    I am reading in a file using numpy.genfromtxt which brings in columns of both strings and numeric values. One thing I need to do is detect the length of the input. This is all fine provided there are more than one value read into each array. But...if there is only one element in the resulting array, the logic fails. I can recreate an example here: import numpy as np a = np.array(2.3) len(a) returns an error saying: TypeError: len() of unsized object however, If a has 2 or more elements, len() behaves as one would expect. import numpy as np a = np.array([2.3,3.6]) len(a) returns 2 My concern here is, if I use some strange exception handling, I can't distinguish between a being empty and a having length = 1.

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  • getting values by time difference in SQL

    - by Maestro1024
    I want to get the difference of two values within a time frame. so I have a table like this Data Table TimeStamp DataValue 2010-06-01 21 2010-06-03 33 2010-06-05 44 So I want to first get all data over the last month which I can do with something like. ([TimeStamp] < GETDATE()-0 and ([TimeStamp] > GETDATE()-31) But I want to see how much value added on over the course of the month. So it started at 21 and went to 44. So I would expect this example to to return 23 (as in 44-21). How would I build a query like this?

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  • VS2010 patch: why it's take so much time to install it? [closed]

    - by Mendy
    Visual Studio 2010 RC has a few of patches release. For more information about them take a look here. What I'm expect from patch program, is to replace a few dll's of the program to a new fixed version of them. But when I run each of this 3 patches, they take a lot of time (5 minutes each), and you think that the program was frozen because the progress bar stay on the begging. This is question may not be so important, but it really interesting me to know, why this happens? It's really confusing to see that each VS2010 (or Microsoft in general) is frozen to 4-5 minutes.

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  • SharePoint use for web application

    - by Adam
    Hi - we are looking at developing a web application that allows users (some subscribed (authenticated) and some not (browsing)). We would like some basic document management, a wiki, a blog etc. and do not expect the app to be heavily used (DB size not an issue at this stage). I require the GUI to be customised to our corporate style and we access to .net development skills which we would like to leverage to develop the application. With this in mind I have the follwoing 3 questions: Is WSS 3.0 / SPF 2010 the correct framework to be building this app on? What are the licensing terms or are these frameworks similar to the .Net framework that once installed on our host server we can use the base services provided to develop our apps on? I hope this makes sense & thanks in advance for any responses.

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  • Is it possible to create a Service that listens for hardware key presses?

    - by VoteBrian
    I'd like to run an Android background service that will act as a keylistener from the home screen or when the phone is asleep. Is this possible? From semi-related examples online, I put together the following service, but get the error, "onKeyDown is undefined for the type Service" public class ServiceName extends Service { @Override public void onCreate() { //Stuff } public IBinder onBind(Intent intent) { //Stuff return null; } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if(event.getAction() == KeyEvent.ACTION_DOWN) { switch(keyCode) { case KeyEvent.KEYCODE_A: //Stuff return true; case KeyEvent.KEYCODE_B: //Stuff return true; //etc. } } return super.onKeyDown(keyCode, event); } } I realize Android defaults to the search bar when you type from the home screen, but this really is just for a very particular use. I don't really expect to distribute this. Also, it'd be nice to use the camera button to wake the phone.

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