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  • How to catch segmentation fault in Linux?

    - by Alex Farber
    I need to catch segmentation fault in third party library cleanup operations. This happens sometimes just before my program exits, and I cannot fix the real reason of this. In Windows programming I could do this with __try - __catch. Is there cross-platform or platform-specific way to do the same? I need this in Linux, gcc.

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  • Don't know why this small shell script wont work

    - by tominated
    Hi, I'm trying to make a small script to start up gunicorn for a python website I'm making. I have modified the script found at https://github.com/benoitc/gunicorn/blob/master/examples/gunicorn_rc slightly. Here's my version. #!/bin/sh GUNICORN=/usr/local/bin/gunicorn ROOT=/srv/mobile-site/app PID=/var/run/gunicorn.pid APP=mobilecms:app if [ -f $PID ]; then rm $PID fi cd $ROOT exec $GUNICORN -b 127.0.0.1:8080 -w 8 -k gevent --pidfile=$PID $APP When I try to run the script though, it shows this error /etc/init.d/gunicorn: 13: Syntax error: end of file unexpected (expecting "fi") Does anyone know what's wrong?

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  • Effects of HTTP/TCP connection handshakes and server performance

    - by Blankman
    When running apache bench on the same server as the website like: ab -n 1000 -c 10 localhost:8080/ I am most probably not getting accurate results when compared to users hitting the server from various locations. I'm trying to understand how or rather why this will effect real world performance since a user in china will have different latency issues when compared to someone in the same state/country. Say my web server has a maximum thread limit of 100. Can someone explain in detail how end user latency can/will effect server performance. I'm assuming here that each request will be computed equally at say 10ms. What I'm not understand is how external factors can effect overal server performance, specifically internet connections (location, or even device like mobile) and http/tcp handshakes etc.

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  • Get 2 recoeds from PLSQL Cursor

    - by Hany
    Hi Guys... my Question is short, I create a cursor to get some values from my table I want to get the current record of cursor (the fetched record) and the next record from the cursor without fetching it, cause I want to make a calculation over the current record and the next record. in traditional Programming it's a simple operation you can do it with for index by increasing it by 1. do you have any suggestion :) thx

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  • pass by reference or pass by value?

    - by Sven
    When learning a new programming language, one of the possible roadblocks you might encounter is the question whether the language is, by default, pass-by-value or pass-by-reference So here is my question to all of you, in your favorite language, how is it actually done? and what are the possible pitfalls? your favorite language can, of course, be anything you have ever played with: popular, obscure, esoteric, new, old ...

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  • Is MVVM pointless?

    - by joebeazelman
    Is orthodox MVVM implementation pointless? I am creating a new application and I considered Windows Forms and WPF. I chose WPF because it's future-proof and offer lots of flexibility. There is less code and easier to make significant changes to your UI using XAML. Since the choice for WPF is obvious, I figured that I may as well go all the way by using MVVM as my application architecture since it offers blendability, separation concerns and unit testability. Theoretically, it seems beautiful like the holy grail of UI programming. This brief adventure; however, has turned into a real headache. As expected in practice, I’m finding that I’ve traded one problem for another. I tend to be an obsessive programmer in that I want to do things the right way so that I can get the right results and possibly become a better programmer. The MVVM pattern just flunked my test on productivity and has just turned into a big yucky hack! The clear case in point is adding support for a Modal dialog box. The correct way is to put up a dialog box and tie it to a view model. Getting this to work is difficult. In order to benefit from the MVVM pattern, you have to distribute code in several places throughout the layers of your application. You also have to use esoteric programming constructs like templates and lamba expressions. Stuff that makes you stare at the screen scratching your head. This makes maintenance and debugging a nightmare waiting to happen as I recently discovered. I had an about box working fine until I got an exception the second time I invoked it, saying that it couldn’t show the dialog box again once it is closed. I had to add an event handler for the close functionality to the dialog window, another one in the IDialogView implementation of it and finally another in the IDialogViewModel. I thought MVVM would save us from such extravagant hackery! There are several folks out there with competing solutions to this problem and they are all hacks and don’t provide a clean, easily reusable, elegant solution. Most of the MVVM toolkits gloss over dialogs and when they do address them, they are just alert boxes that don’t require custom interfaces or view models. I’m planning on giving up on the MVVM view pattern, at least its orthodox implementation of it. What do you think? Has it been worth the trouble for you if you had any? Am I just a incompetent programmer or does MVVM not what it's hyped up to be?

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  • delphi prism online resources

    - by omair iqbal
    google search on ''delphi prism' , ''delphi prism resources'' or ''delphi prism code snippets'' reveal almost no good site at all are there any good programming site(s) with some good amount of code snippets and tutorials on delphi prism thanks in advance

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  • A good web data extraction/screen scraper program?

    - by Taylor
    I need to capture product data from a site on a regular basis and wondered if any one knows of a good software program? I've trialed Mozenda but its a monthly subscription and pricey in the long term. Obviously something thats free would be best but I don't mind paying either. Just need a decent program thats reliable and doesn't require much programming knowledge.

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  • Rails on server syntax error?

    - by Danny McClelland
    Hi Everyone, I am trying to get my rails application running on my web server, but when I run the rake db:migrate I get the following error: r oot@oak [/home/macandco/rails_apps/survey_manager]# rake db:migrate (in /home/macandco/rails_apps/survey_manager) == Baseapp: migrating ======================================================== -- create_table(:settings, {:force=>true}) -> 0.0072s -- create_table(:users) -> 0.0072s -- add_index(:users, :login, {:unique=>true}) -> 0.0097s -- create_table(:profiles) -> 0.0084s -- create_table(:open_id_authentication_associations, {:force=>true}) -> 0.0067s -- create_table(:open_id_authentication_nonces, {:force=>true}) -> 0.0064s -- create_table(:roles) -> 0.0052s -- create_table(:roles_users, {:id=>false}) -> 0.0060s rake aborted! An error has occurred, all later migrations canceled: 555 5.5.2 Syntax error. g9sm2526951gvc.8 Has anyone come across this before? Thanks, Danny Main Migration file c lass Baseapp < ActiveRecord::Migration def self.up # Create Settings Table create_table :settings, :force => true do |t| t.string :label t.string :identifier t.text :description t.string :field_type, :default => 'string' t.text :value t.timestamps end # Create Users Table create_table :users do |t| t.string :login, :limit => 40 t.string :identity_url t.string :name, :limit => 100, :default => '', :null => true t.string :email, :limit => 100 t.string :mobile t.string :signaturenotes t.string :crypted_password, :limit => 40 t.string :salt, :limit => 40 t.string :remember_token, :limit => 40 t.string :activation_code, :limit => 40 t.string :state, :null => :false, :default => 'passive' t.datetime :remember_token_expires_at t.string :password_reset_code, :default => nil t.datetime :activated_at t.datetime :deleted_at t.timestamps end add_index :users, :login, :unique => true # Create Profile Table create_table :profiles do |t| t.references :user t.string :real_name t.string :location t.string :website t.string :mobile t.timestamps end # Create OpenID Tables create_table :open_id_authentication_associations, :force => true do |t| t.integer :issued, :lifetime t.string :handle, :assoc_type t.binary :server_url, :secret end create_table :open_id_authentication_nonces, :force => true do |t| t.integer :timestamp, :null => false t.string :server_url, :null => true t.string :salt, :null => false end create_table :roles do |t| t.column :name, :string end # generate the join table create_table :roles_users, :id => false do |t| t.column :role_id, :integer t.column :user_id, :integer end # Create admin role and user admin_role = Role.create(:name => 'admin') user = User.create do |u| u.login = 'admin' u.password = u.password_confirmation = 'advices' u.email = '[email protected]' end user.register! user.activate! user.roles << admin_role end def self.down # Drop all BaseApp drop_table :settings drop_table :users drop_table :profiles drop_table :open_id_authentication_associations drop_table :open_id_authentication_nonces drop_table :roles drop_table :roles_users end end

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  • Anonymous methods/functions: a fundamental feature or a violation of OO principles?

    - by RD1
    Is the recent movement towards anonymous methods/functions by mainstream languages like perl and C# something important, or a weird feature that violates OO principles? Are recent libraries like the most recent version of Intel's Thread Building Blocks and Microsofts PPL and Linq that depend on such things a good thing, or not? Are languages that currently reject anonymous methods/functions, like Java, making wise choices in sticking with a purely OO model, or are they falling behind by lacking a fundamental programming feature?

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  • How can I limit my data usage over tethering on Windows?

    - by Casebash
    The excess data charges if I go over my tethering data limit are ridiculously. Fennec already stated the question well. Because of this, and on general principle, I'd like to have some tools which permit me to do things like: Monitor the amount of bandwidth that I've used I think I can do this from Sprint too, but on-the-computer is nice too on-the-computer gives me a possibility of breaking it down by application See what sort of programs are using the Internet connection I could use, like, Wireshark, but that's a bit too micro-level to be practical Keep those programs, and the operating system, from doing things like "downloading an operating system update" while on the mobile hotspot Related I want to monitor and limit OS X's data transfer while I'm tethering via my iPhone

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  • Code to send email not working.

    - by RPK
    When I am trying to execute following code to email the contact form details, it is not executing properly. Instead, when the contact form's Submit button is clicked, it just shows the below source code in the browser. What's wrong? <?php error_notice(E_ALL^E_NOTICE); $firstname = $_POST['fname']; $emailaddress = $_POST['eaddress']; $mobile = $_POST['cellno']; $phone = $_POST['landline']; $country = $_POST['ucountry']; $city = $_POST['ucity']; $subjects = $_POST['usubjects']; $message = $_POST['umessage']; // EDIT THE 2 LINES BELOW AS REQUIRED $email_to = "[email protected]"; $email_subject = $subjects; function died($error) { // your error code can go here echo "We are very sorry, but there were error(s) found with the form your submitted. "; echo "These errors appear below.<br /><br />"; echo $error."<br /><br />"; echo "Please go back and fix these errors.<br /><br />"; die(); } // validation expected data exists if(!isset($firstname) || !isset($emailaddress) || !isset($subjects) || !isset($message)) { died('We are sorry, but there appears to be a problem with the form your submitted.'); } $error_message = ""; $email_exp = "^[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$"; if(!eregi($email_exp,$emailaddress)) { $error_message .= 'The Email Address you entered does not appear to be valid.<br />'; } $string_exp = "^[a-z .'-]+$"; if(!eregi($string_exp,$firstname)) { $error_message .= 'The First Name you entered does not appear to be valid.<br />'; } if(strlen($message) < 2) { $error_message .= 'The Comments you entered do not appear to be valid.<br />'; } $string_exp = "^[0-9 .-]+$"; if(!eregi($string_exp,$phone)) { $error_message .= 'The Telphone Number you entered does not appear to be valid.<br />'; } if(strlen($error_message) > 0) { died($error_message); } $email_message = "Form details below.\n\n"; function clean_string($string) { $bad = array("content-type","bcc:","to:","cc:","href"); return str_replace($bad,"",$string); } $email_message .= "First Name: ".clean_string($firstname)."\n"; $email_message .= "Last Name: ".clean_string($mobile)."\n"; $email_message .= "Email: ".clean_string($emailaddress)."\n"; $email_message .= "Telephone: ".clean_string($phone)."\n"; $email_message .= "City: ".clean_string($city)."\n"; $email_message .= "Telephone: ".clean_string($country)."\n"; $email_message .= "Comments: ".clean_string($message)."\n"; // create email headers $headers = 'From: '.$email_from."\r\n". 'Reply-To: '.$email_from."\r\n" . 'X-Mailer: PHP/' . phpversion(); @mail($email_to, $email_subject, $email_message, $headers); ?>

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  • UUID library for C?

    - by ptomato
    I'm looking for a UUID library for programming in C, that has a reasonable probability of being installed (or at least installable by package manager) on most modern Linux desktops, and works with pkg-config. The following two possibilities seem most obvious: OSSP UUID Libuuid from e2fsprogs Does anybody have experience with these two and can recommend one over the other, or a third possiblity?

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  • How to set android lock screen image

    - by robintw
    Hi, I'm just getting started with android programming, and want to see if there is a way to programmatically set the lock screen image. I've found various ways of setting the wallpaper in the API, but I can't seem to find the equivalent ways of setting the lock screen image. I've seen various posts saying that customising the lock screen by adding widgets or bits of applications is not possible, but surely there must be a way to set the image programmatically? Cheers, Robin

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  • Get two records from PLSQL cursor

    - by Hany
    My question is short. I create a cursor to get some values from my table. I want to get the current record of cursor (the fetched record) and the next record from the cursor without fetching it, because I want to make a calculation over the current record and the next record. In traditional programming it's a simple operation; you can do it with a for index by increasing it by 1. Do you have any suggestions?

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  • Stuck on Checking battery state at startup in Ubuntu, have splash screen no startup

    - by jeffhsu3
    I am running Ubuntu 10.04 LTS. When I boot up the computer it goes to the splash but there is no login screen, just the purple background and the mouse cursor. "Checking battery state" is the last line that does not have an "[OK]". When I press Ctr-alt-shift-F1 I can login and sudo stop gdm and startx. However this makes it so that the applets don't show. Error: "The panel encountered a problem while loading "OAFIID:GNOME_notificationAreaApplet" and does it for every single applet. Everything else works fine though. I get a EHCI: BIOS handoff failed twice in the dmesg as well. The laptop has intel mobile integrated graphics. UPDATE: Now my desktop has the exact same problem. Things that I have tried: Changing to GRUB_CMDLINE_LINUX_DEFAULT="i915.modeset=1 acpi=off"

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  • c++ FFT Beat detection library?

    - by mokaschitta
    Hi, I am currently looking around for a good allround beat detection library / source code in C++ since I found it really hard to achieve satisfying results with the beat detection code I wrote myself using this tutorial: http://www.gamedev.net/reference/programming/features/beatdetection/ It's especially really hard if you want to make it work with any kind of music so I was wondering if there is something usable out there allready? Thanks!

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  • Looking for a good book on microprocessor internals

    - by David Holm
    I'm looking for a good book on how modern microprocessors are designed and work as I would like to increase my understanding of what makes them tick. Something that covers pipelines, superscalar architectures, caches etc. A book that is suitable for a programmer with several years of experience and has done and understands assembly programming and machine language, so basically not "CPUs for Dummies" or anything such. What books do people who design today's processors read for instance?

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  • What are interesting ideas for experimenting with Artificial Neural Networks?

    - by Gerald Kaszuba
    I'm after a list of possible neural network implementations that one can do to learn how to use it. What other possibilities are there? Here's the list so far: Games tic-tac-toe Connect 4 Chess Go Visual recognition Character recognition (typefaces, letters, numbers, etc) Facial recognition Audio recognition Language detection Male vs female Word recognition Language detection (natural, programming)

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  • Open-stackoverflow installation/download info

    - by fmsf
    Hey, You probably already know about this I guess it's a programming question. I've been trying to find with google the info, but the amount of results using "open stackoverflow" pointing to questions here in stackoverflow is making the search a bit hard. So what better place to ask than here. Where can i find information/documentation on how to install/use/extend the SO q&a system? I want to create a clone for a local community from my city.

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