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• C Remove the first line from a text file without rewriting file

  - by Tom Van den Bon

  Hi, I've got a service which runs all the time and also keeps a log file. It basically adds new lines to the log file every few seconds. I'm written a small file which reads these lines and then parses them to various actions. The question I have is how can I delete the lines which I have already parsed from the log file without disrupting the writing of the log file by the service? Usually when I need to delete a line in a file then I open the original one and a temporary one and then I just write all the lines to the temp file except the original which I want to delete. Obviously this method will not word here. So how do I go about deleting them ?

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• To "null" or not to "null" my class's attributes

  - by Helper Method

  When I write a class in Java, I like to initialize the attributes which are set to a default value directly and attributes which are set by the caller in the constructor, something like this: public class Stack<E> { private List<E> list; private size = 0; public Stack(int initialCapacity) { list = new ArrayList<E>(initialCapacity); } // remainder omitted } Now suppose I have a Tree class: public class Tree<E> { private Node<E> root = null; // no constructor needed, remainder omitted } Shall I set the root attribute to null, to mark that it is set to null by default, or omit the null value?

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• Using Nokogiri to scrape groupon deal

  - by hyngyn

  I'm following the Nokogiri railscast to write a scraper for Groupon. I keep on getting the following error when I run my rb file. traveldeal_scrape.rb:10: warning: regular expression has ']' without escape: /\[0-9 \.]+/ Flamingo Conference Resort and Spa Deal of the Day | Groupon Napa / Sonoma traveldeal_scrape.rb:9:in `block in <main>': undefined local variable or method `item' for main:Object (NameError) Here is my scrape file. require 'rubygems' require 'nokogiri' require 'open-uri' url = "http://www.groupon.com/deals/ga-flamingo-conferences-resort-spa?c=all&p=0" doc = Nokogiri::HTML(open(url)) puts doc.at_css("title").text doc.css(".deal").each do |deal| title = deal.at_css("#content//a").text price = deal.at_css("#amount").text[/\[0-9\.]+/] puts "#{title} - #{price}" puts deal.at_css(".deal")[:href] end I used the exact same rubular expression as the tutorial. I am also unsure of whether or not my CSS tags are correct. Thanks!

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• Can I program Nvidia's CUDA using only Python or do I have to learn C?

  - by Aquateenfan

  I guess the question speaks for itself. I'm interested in doing some serious computations but am not a programmer by trade. I can string enough python together to get done what I want. But can I write a program in python and have the GPU execute it using CUDA? Or do I have to use some mix of python and C? The examples on Klockner's (sp) "pyCUDA" webpage had a mix of both python and C, so I'm not sure what the answer is. If anyone wants to chime in about Opencl, feel free. I heard about this CUDA business only a couple of weeks ago and didn't know you could use your video cards like this. thx

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• how to choose which row to insert with same id in sql?

  - by user1429595

  so Basically I have a table called "table_1" : ID Index STATUS TIME DESCRIPTION 1 15 pending 1:00 Started Pending 1 16 pending 1:05 still in request 1 17 pending 1:10 still in request 1 18 complete 1:20 Transaction has been completed 2 19 pending 2:25 request has been started 2 20 pending 2:30 in progress 2 21 pending 2:35 in progess still 2 22 pending 2:40 still pending 2 23 complete 2:45 Transaction Compeleted I need to insert these data into my second table "table_2" where only start and compelete times are included, so my "table_2" should like this: ID Index STATUS TIME DESCRIPTION 1 15 pending 1:00 Started Pending 1 18 complete 1:20 Transaction has been completed 2 19 pending 2:25 request has been started 2 23 complete 2:45 Transaction Compeleted if anyone can help me write sql query for this I would highly appreciate it. Thanks in advance

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• Does MultiThreading in Java takes much time for task completion?

  - by Geeta

  I have to search for a string in 10 large size files (in zip format 70 MB) and have to print the lines with the search string to corresponding 10 output files.(i.e. file 1 output should be in output_file1...file2--- output_file2). The same program takes 15 mins for a single file. But if use 10 threads to read 10 files and to write in 10 different files it should complete in 15 mins but its taking 40 mins. How can I solve this. Or multithreading will take this much time only?

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• Convince teammates to follow standards

  - by folone

  There's always one or two guys, who think, they are great programmers, and they don't need any literature/specifications/etc. They usually write awful code, that makes you want to hurt them. They catch and suppress Throwable's, return null's, concatenate String's in large loops, do other stupid stuff. So the question is — How do I make such a person follow best practices and specifications? He does not listen (cause he's the best programmer), team lead does not give a damn ("It actually works, so why changing it?.."), and I'm actually tired of rewriting that awful code on my own. What do I do? What would you do?

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• how to send multiple commands to a file in cron??

  - by developer

  I have a file that is having some multiple dynamic parameters.I want to send these parameters at the time of writing a file in main cron file. Something like this - */15 * * * * /usr/bin/php /a/b/c.php parameter1 parameter2 parameter3 parameter4 Now i tried working this up but my file is not executing. What im concerned about is that how will my php file will fetch these parameters ?? And how will i write this command when there is only 2 parameters to be passes parameter1 and parameter4??? and how will my cron and php will recognoze that which parameter is for which data and all?? please advice!!

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• What's the benefit of calling new on an object instance?

  - by Geo

  I'm reading [Programming Perl][1], and I found this code snippet: sub new { my $invocant = shift; my $class = ref($invocant) || $invocant; my $self = { color => "bay", legs => 4, owner => undef, @_, # Override previous attributes }; return bless $self, $class; } With constructors like this one, what's the benefit of calling new on an object instance? I assume that it's what it's for, right? My guess is that if anyone would want to write such a constructor, he would have to add some more code that copies the attributes of the first object to the one about to be created.

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• asp.net web service OneWay definition not working

  - by jbrook10

  When I specify <SoapDocumentMethod(OneWay:=True)> on my webservice it doesn't seem to get called. If I remove that the webservice works properly. Also, everything works fine on the development machine just not on the server. Here is my web method: <SoapDocumentMethod(OneWay:=True)> _ <WebMethod()> _ Public Sub Write(ByVal processGroupId As Integer) xslClass.xslHelper.writeDatabase(processGroupId) ', processGroupName) End Sub Here is my calling code: Dim svc As New svcWriteFiles.WriteDatabaseService svc.WriteAsync(e.CommandArgument) Any ideas?

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• The best way to ensure only 1 copy of bash script is running?

  - by depesz

  What is the simplest/best way to ensure only 1 copy of given script is running - assuming it's bash on linux? At the moment I'm doing: ps -C script.name.sh > /dev/null 2>&1 || ./script.name.sh but it has several issues: it puts the check outside of script it doesn't let me run the same script from separate accounts - which I would like sometimes. -C checks only first 14 characters of process name Of course I can write my own pidfile handling, but I sense that there should be some simple way to do it.

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• Precision problems of real numbers in Fortran

  - by saladoil

  I've been trying to use Fortran for my research project, with the GNU Fortran compiler (gfortran), latest version, but I've been encountering some problems in the way it processes real numbers. If you have for example the code: program test implicit none real :: y = 23.234, z z = y * 100000 write(*,*) y, z end program You'll get as output: 23.23999 2323400.0. I find this really strange. Can someone tell me what's exactly happening here? Looking at z I can see that y does retain its precision, so for calculations that shouldn't be a problem I suppose. But why is the output of y not exactly the same as the value that I've specified, and what can I do to make it exactly the same?

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• Why is url not registered?(Drupal 6.x)

  - by Andrew

  I'm using hook_menu to register new url so that accessing this url would return some data to ajax function. As title suggested, this url is not registered. How do I know that? I've tried typing this in address bar but, drupal, return main template only rather than the tests string that I created. I'm positive that my module is working for php issues error if I intentionally write wrong syntax. And, yes, I clear cache whenever I make changes. Here's the code - function test_menu() { $my_form['test'] = array( 'title' => 'Test address', 'page callback' => 'test', 'access arguments' => array('access content'), 'type' => MENU_CALLBACK, ); return $my_form; } function test(){ $a= "testing"; return $a; }

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• Reading and writing dates to the registry for trial version purposes.

  - by LeeW

  Hi all, Here's what I want to do, I want to store the date the first time the program is installed and also store a date when was the program was last run. I want the code to check to see if it was more than 30 days since the installation so I can turn off features. I also want to check if the system date is less than the last opened date and if so write the installed date to 1/1/1901 to prevent the program from running. Keeping in mind that this is not a consumer program but a business program I don't expect hackers to crack it, they may do but that is fine I simply want to give potential customers a reason to consider purchasing the program and the end of the trial will prompt this. 1: Does this sound reasonable? 2: How should I hide the fact this is a date so it's not easily changed? Many thanks Lee

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• Passing Global Variable value to Facebook - Gets NULL only

  - by Viral

  hi all friends, I am making a game application in that I want to pass my score on wall of face book. I've completed all the things (the log in and message passing part) but when I passes the score via global variable, I am getting only null as a value and not the score that I want. Is there any way to pass data or string to Face book and write on a wall? My code is (void)viewDidLoad { static NSString* kApiKey = @"be60415be308e2b44c0ac1db83fe486b"; static NSString* kApiSecret = @"4f880c7e100321f808c41b1d3c813dfa"; _session = [[FBSession sessionForApplication:kApiKey secret:kApiSecret delegate:self] retain]; score = [NSString stringWithFormat:@"%@",appDelegate.myTextView]; [_session resume]; [super viewDidLoad]; } whre score is NSString and myTextView is NSString in other viewcontrollerfile, And appDelegate is global variable. Any help?? thanks in advance.

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• Named keywords in decorators?

  - by wheaties

  I've been playing around in depth with attempting to write my own version of a memoizing decorator before I go looking at other people's code. It's more of an exercise in fun, honestly. However, in the course of playing around I've found I can't do something I want with decorators. def addValue( func, val ): def add( x ): return func( x ) + val return add @addValue( val=4 ) def computeSomething( x ): #function gets defined If I want to do that I have to do this: def addTwo( func ): return addValue( func, 2 ) @addTwo def computeSomething( x ): #function gets defined Why can't I use keyword arguments with decorators in this manner? What am I doing wrong and can you show me how I should be doing it?

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• Ruby-Graphwiz does not render png

  - by auralbee

  I just tried the ruby-graphwiz gem (http://github.com/glejeune/Ruby-Graphviz). I followed the instructions (installed Graphwiz, gem and dependencies) and tried the example from the Github page. Unfortunately I am not able to render any output image (png,dot). # Create a new graph g = GraphViz.new( :G, :type => :digraph ) # Create two nodes hello = g.add_node( "Hello" ) world = g.add_node( "World" ) # Create an edge between the two nodes g.add_edge( hello, world ) # Generate output image g.output( :png => "hello_world.png" ) When I run the skript from the console I get no error message but also no output as expected. What could be the problem? Folders have read/write access for everybody. Thanks in advance. By the way, I´m working on a Mac (Leopard 10.6).

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• Merge Primary Keys - Cascade Update

  - by Chris Jackson

  Is there a way to merge two primary keys into one and then cascade update all affected relationships? Here's the scenario: Customers (idCustomer int PK, Company varchar(50), etc) CustomerContacts (idCustomerContact int PK, idCustomer int FK, Name varchar(50), etc) CustomerNotes (idCustomerNote int PK, idCustomer int FK, Note Text, etc) Sometimes customers need to be merged into one. For example, you have a customer with the id of 1 and another with the id of 2. You want to merge both, so that everything that was 2 is now 1. I know I could write a script that updates all affected tables one by one, but I'd like to make it more future proof by using the cascade rules, so I don't have to update the script every time there is a new relationship added. Any ideas?

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• Finding files with bash and copy to another location and reducing depth of folders

  - by Kevin F

  I'm trying to recover a mates hard drive, there is no structure what so ever so music and images are everywhere but in named folders sometimes 5 folders deep, I've managed to write a one-liner that finds the files and copies them to a mounted drive but it preserves the file structure completely. What I'm after is a bit of code that searches the drive and copies to another location and copies just the parent folder with the mp3/jpg files within and not the complete path. The other issue I have is the music is /folder/folder/folder/Artist/1.mp3..2.mp3..10.mp3 etc etc so I have to preserve the folder 'Artist' to give him any hope of finding his tracks again. What I have working currently: find /media/HP/ -name *.mp3 -fprintf /media/HP/MUSIC/Script.sh 'mkdir -p "/media/HP/MUSIC/%h" \n cp "%h/%f" "/media/HP/MUSIC/%h/"\n' I then run the script.sh and it does all the copying. Many Thanks

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• How do I make a project in Django? Beginner

  - by ggfan

  Okay I just started with Django and it's totally different from PHP. I installed Python 2.6 and Django. Both are located in my C drive. C: Django build django docs Python26 I am doing the django site tutorial and when they say to write django-admin.py startproject mysite from my Python command line, I keep getting: Syntax error: invalid syntax >>>django-admin.py startproject mysite FILE "<stdin>", line 1 django-admin.py startproject mysite ^ My django-admin.py is in the django/bin folder. I installed Python via python setup.py. Am I suppose to use my window's CP? When I do that, I get window's can't open a .py file. I thought I was just creating a folder? How do I create a project with django? Thanks :)

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• How to find out the dimensionality of print paper in javascript

  - by tzador

  I am generating reports in HTML formats, and want to print them automatically using Qt (qt has a webkit based browser, and one can render its contents to a PDF file). I want to position the elements of the report depending on the target page size. For that i need to access the size of the paper (preferably in pixels). Since i am using webkit, it has all the latest html5 and css3 features. is there some api available to access printed page properties inside javascript. for example, would be nice to write: window.print_paper.width or window.print_paper.height Thank you in advance

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• A section of a program designed to swap the values of two variables [closed]

  - by gary

  Line 1.var numberOne; 2.var numberTwo; 3.numberOne = 9; 4.numberTwo = 1; 5.numberOne = numberTwo; 6.numberTwo = numberOne; For each of the lines in the program above, give the values held by numberOne and numberTwo at that point in the program. You do not need to write any JavaScript. Help me pls. Thank you.

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• Serialization java to c#

  - by tom

  Hi, I have manged to serialize an arraylist in java using xstream, send it to my c# application via http and then write that to file (just for now). The serialized data was an arraylist in java. I want to try and re form this arraylist in c# from the xml i have. I have been looking at http://code.google.com/p/xstream-dot-net/ to do this. Does anyone know if that is the right way to go or is there a better way of reforming the serialized data in c#?

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• ASP.NET MVC - how to modify requested URLs?

  - by Marek

  The baidu spider seems to be adding ¤ to end of some crawled urls (it seems that it happens with urls containing single unicode character as the last character) The baidu-requested url looks like this: site.com/abc/ä¤ while site.com/abc/ä is the valid url and as linked from many places on my site. The internal problem is that a different route is matched for this kind of url and an unhandled exception occurs. I would not like to lose baidu because of too many 500 errors on the site. I would like to change the requested URL to a different URL by removing the added character before any ASP.NET MVC processing of the request starts. Can I write a request filter/http module or something similar in ASP.NET MVC to remove the trailing '¤' from the urls? I would not like to alter my routes to counter-hack this behavior.

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• Is it kEatSpeed or kSpeedEat?

  - by bobobobo

  I have a bunch of related constants that are not identical. What's the better way to name them? way #1 kWalkSpeed kRunSpeed kEatSpeed kDrinkSpeed Or, way #2 kSpeedWalk kSpeedRun kSpeedEat kSpeedDrink If we evaluate these based on readability understandability not bug prone with subtle errors due to using wrong variable name I think way #1 wins readability, they tie for understandability, and way #2 wins for not bug prone. I'm not sure how often it happens to others, but when variable names like this get long, then its easy to write kSpeedEatingWhenInAHurry when you really meant kSpeedEatingWhenInHome, especially when using autocomplete. Any perspectives?

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