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Articles indexed Sunday April 25 2010

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  • How easy is it to write a Flash app and what tools are needed?

    - by J Lynch
    I have been wanting to learn to write a Flash app so that it can be embedded inside a webpage. But is it hard to write one, say, just to show a circle bouncing around the walls of the 4 sides of the Flash window (no gravity, but just like the dot in the game "Pong"), and what tools are needed (and are they free?). Thanks very much.

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  • Given two lines on a plane, how to find integer points closest to their interseciton?

    - by Lukasz Lew
    I can't solve it: You are given 8 integers: A, B, C representing a line on a plane with equation A*x + B*y = C a, b, c representing another line x, y representing a point on a plane The two lines are not parallel therefore divide plane into 4 pieces. Point (x, y) lies inside of one these pieces. Problem: Write a fast algorithm that will find a point with integer coordinates in the same piece as (x,y) that is closest to the cross point of the two given lines. Note: This is not a homework, this is old Euler-type task that I have absolutely no idea how to approach.

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  • How to controll (and emulate) monitor/projector on Linux?

    - by klew
    I would like to write some C/C++ program to controll monitor/projector attached to my computer. I've googled around, but I couldn't find almost anything that would lead me in some direction. Do you know where I can learn about it? What I would like to do is to write "Hello world" on an external monitor. It would be also nice to have some "monitor emulator" that will act as physicaly attached monitor (or to write program to emulate it). I'm not sure if it is possible. I couldn't find anything like this. I'm working on Ubuntu 9.10 with Gnome.

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  • How do I dynamically define an instance variable?

    - by Moses
    Hi everyone, I have two classes (class1 and class2) that just store data, no methods. I have a third class that has an instance variable that, depending on some user input, will be set to one of the two classes. So, in the third class I declare the variable generically as NSObject *aClass; and during runtime set it to whatever it should be. aClass = [[Class1 alloc] init]; // or aClass = [[Class2 alloc] init]; However, when I try to access fields from aClass NSString *str = aClass.field1; It gives me the error: request for member 'field1' in something not a structure or a union. Field1 is declared in both class1 and class2. When I try to cast aClass aClass = (Class1 *) aClass; it gives the same error. What am I doing wrong, is there a better way to do this?

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  • What do I gain by filtering URLs through Perl's URI module?

    - by sid_com
    Do I gain something when I transform my $url like this: $url = URI-new( $url )? #!/usr/bin/env perl use warnings; use strict; use 5.012; use URI; use XML::LibXML; my $url = 'http://stackoverflow.com/'; $url = URI->new( $url ); my $doc = XML::LibXML->load_html( location => $url, recover => 2 ); my @nodes = $doc->getElementsByTagName( 'a' ); say scalar @nodes;

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  • C# dealing with invalid user input

    - by Zka
    Have a simple console app where user is asked for several values to input. Input is read via console.readline(). Ex Name: Fred //string Lastname: Ashcloud //string Age: 28 //int I would like to make sure that int and double types are entered and if the user enters garbage, lets him repeat the procedure. Example, if the user enters "28 years old" where age expects int the app will crash. What is the best way to check for these inputs? Right now I can only think of: while (!Int32.TryParse(text, out number)) { Console.WriteLine("Error write only numbers"); text = Console.ReadLine(); } Is there any other way to do this? try catch statements if one wants to give a more detailed feedback to the user? How in that case?

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  • Why is this Scala example of implicit paremeter not working?

    - by Alex R
    simple REPL test... def g(a:Int)(implicit b:Int) = {a+b} Why do neither of these attempted usages work? 1. scala class A { var b:Int =8; var c = g(2) } :6: error: could not find implicit value for parameter b: Int class A { var b:Int =8; var c = g(2) } 2. scala class A(var b:Int) { var c = g(2) } :6: error: could not find implicit value for parameter b: Int class A(var b:Int) { var c = g(2) } ^ Thanks

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  • Problems with ASP.NET State Service version; state service is 1.1, website is 3.5

    - by Mick Byrne
    Hi there, I have a ASP.NET 3.5 website running on Windows Server 2003 and I'm using the ASP.NET State Service to manage sessions. It will appear to be working then I regularly get an error saying my code needs to have version 2.0 of the State Service running to work (I think that's what it said, I've temporarily switched back to storing sessions InProc). Refresh the page and the error goes away (for a bit, it's bound to come back). So I looked at the properties of the ASP.NET State Service in the Services interface and it's mapping to a .exe in the 1.1 framework folder: C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\aspnet_state.exe There's a corresponding version in the 2.0 framework folder, but I don't know how to add it as a new service. I'm also not sure that adding the 2.0 version (and stopping and/or removing the 1.1 version) will solve the problem. Thanks in advance for any help anyone can provide. Mick

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  • Need themes for the WPF Toolkit controls (espeically DataGrid)

    - by DanM
    I just downloaded the nice themes collection from the Codeplex WPF Themes site. I like the WhisterBlue and BureauBlue themes a lot, but neither contain any styles for the new controls included in the WPF Toolkit (DataGrid, DatePicker, and Calendar). It seems like someone out there must have extended the themes to cover these controls, but I've had no luck finding them. So, if you have any leads, I'd love to hear them. I should also mention that I've been trying to port a Silverlight version of the BureauBlue DataGrid theme to WPF (see: http://stackoverflow.com/questions/1611135/how-do-you-port-a-theme-from-silverlight-to-wpf), but that has been quite unsuccessful so far.

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  • Why does this MSDN example for Func<> delegate have a superfluous Select() call?

    - by Dan
    The MSDN gives this code example in the article on the Func Generic Delegate: Func<String, int, bool> predicate = ( str, index) => str.Length == index; String[] words = { "orange", "apple", "Article", "elephant", "star", "and" }; IEnumerable<String> aWords = words.Where(predicate).Select(str => str); foreach (String word in aWords) Console.WriteLine(word); I understand what all this is doing. What I don't understand is the Select(str => str) bit. Surely that's not needed? If you leave it out and just have IEnumerable<String> aWords = words.Where(predicate); then you still get an IEnumerable back that contains the same results, and the code prints the same thing. Am I missing something, or is the example misleading?

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  • Python script repeated auto start up.

    - by Ali
    I am designing a python web app, where people can have an email sent to them on a particular day. So a user puts in his emai and date in a form and it gets stored in my database. My script would then search through the database looking for all records of todays date, retrive the email, sends them out and deletes the entry from the table. Is it possible to have a setup, where the script starts up automatically at a give time, say 1 pm everyday, sends out the email and then quits? If I have a continuously running script, i might go over the CPU limit of my shared web hosting. Or is the effect negligible? Ali

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  • string parsing and substring in c

    - by Josh
    I'm trying to parse the string below in a good way so I can get the sub-string stringI-wantToGet: const char *str = "Hello \"FOO stringI-wantToGet BAR some other extra text"; str will vary in length but always same pattern - FOO and BAR What I had in mind was something like: const char *str = "Hello \"FOO stringI-wantToGet BAR some other extra text"; char *probe, *pointer; probe = str; while(probe != '\n'){ if(probe = strstr("\"FOO")!=NULL) probe++ else probe = ""; // Nulterm part if(pointer = strchr(probe, ' ')!=NULL) pointer = '\0'; // not sure here, I was planning to separate it with \0's } Any help will be appreciate it.

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  • $_SERVER["SCRIPT_URI"] not working? alternative?

    - by Ahmad Fouad
    Hi, This is odd, but for some reason the $_SERVER["SCRIPT_URI"] will not return the domain name when I am in child/sub-pages but will only work on the main page. Not sure if its due to the script (WordPress) or host, but please can you suggest any reliable solution to retrieve the domain name with PHP? I am very thankful in advance, Regards

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  • How to Edit Permission on "Create"? SharePoint

    - by DanSogaard
    When you go to Lists, and Create. I'd like to show the "Custom Lists" column only to specific group. I don't want the users to be able to create Web Pages, Document Libs .. etc But I'm not able to see how, I tried to create a custom group and edit permission level, but I cant find where exactly. does enabling "Create" to specific group opens all settings inside that you can't eliminate certain settings from showing to this group?.

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  • [LaTeX] How to remove \hyphenpenalty & \pretolerance influence on section/subsection headers

    - by oleg-strikov
    Hi there, In my latex document i've set \hyphenpenalty=15000 and \pretolerance=10000 to remove word hyphenation and make text bounds even. But I can't disable this effect for section/subsection headers. All headers looks badly due to big spaces between words (image). Are there any solution to disable \hyphenpenalty=15000 and \pretolerance=10000 effect for headers? Thank you!

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  • Cant fetch production db results using Google app engine remote_api

    - by Alon
    Hey, im trying to work out with /remote_api with a django-patch app engine app i got running. i want to select a few rows from my online production app locally. i cant seem to manage todo so, everything authenticates fine, it doesnt breaks on imports, but when i try to fetch something it just doesnt print anything. Placed the test python inside my local app dir. #!/usr/bin/env python # import os import sys # Hardwire in appengine modules to PYTHONPATH # or use wrapper to do it more elegantly appengine_dirs = ['myworkingpath'] sys.path.extend(appengine_dirs) # Add your models to path my_root_dir = os.path.abspath(os.path.dirname(__file__)) sys.path.insert(0, my_root_dir) from google.appengine.ext import db from google.appengine.ext.remote_api import remote_api_stub import getpass APP_NAME = 'Myappname' os.environ['AUTH_DOMAIN'] = 'gmail.com' os.environ['USER_EMAIL'] = '[email protected]' def auth_func(): return (raw_input('Username:'), getpass.getpass('Password:')) # Use local dev server by passing in as parameter: # servername='localhost:8080' # Otherwise, remote_api assumes you are targeting APP_NAME.appspot.com remote_api_stub.ConfigureRemoteDatastore(APP_NAME, '/remote_api', auth_func) # Do stuff like your code was running on App Engine from channel.models import Channel, Channel2Operator myresults = mymodel.all().fetch(10) for result in myresults: print result.key() it doesnt give any error or print anything. so does the remote_api console example google got. when i print the myresults i get [].

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  • ATI Catalyst setting to stretch Windows XP start bar across both displays

    - by scunliffe
    I have a Lenovo T400 laptop with an ATI Mobility Radeon HD 3400 Series video card, using the ATI Catalyst Control Center to span my Windows XP display over the laptop display and a Dell flatpanel LCD. This works fine, but I'm used to NVIDIA multi-desktop that let me control the "Start bar" to either exist on only 1 screen... be duplicated on both, or (what I want), stretched across both. Is this possible with the ATI card/Catalyst Software? If not, are there any utilities out there that will handle this for me? That is, what I have: +----------+ +----------+ | | | | | Lenovo | | Dell | | (primary)| | | +----------+ | | |Start Tray| | | +----------+ +----------+ And this is what I want: +----------+ +----------+ | | | | | Lenovo | | Dell | | (primary)| | | +----------+ +----------+ |Start | | Tray| +----------+ +----------+

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  • How to install MinGW Correctly on Windows

    - by Ell
    Hello all, I have recently started learning C++ but I require a compiler. I have tried the one packaged with Code::Blocks but I have been told it is out of date. I have tried reading the instructions on the website but I simply don't know which files to download and un-zip. Does anyone know of a list of files to download? (latest version) and a folder structure I need? thanks in advance, ell.

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