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Midi Music Flash Cards 1.0.1 (Default branch)
07-26-2008
Midi Music Flash Cards is a music sight-reading trainer. It generates flashcards dynamically according to "modes" as specified through a handful of menus across the top. In auto-mode it continuously generates flashcards, with controllable time intervals between MIDI playback and a further time interval between displaying written feedback about the key and notes. License: GNU General Public License v2 Changes:|
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Net::DBus::Error(3pm) User Contributed Perl Documentation Net::DBus::Error(3pm) NAME
Net::DBus::Error - Error details for remote method invocation SYNOPSIS
package Music::Player::UnknownFormat; use base qw(Net::DBus::Error); # Define an error type for unknown track encoding type # for a music player service sub new { my $proto = shift; my $class = ref($proto) || $proto; my $self = $class->SUPER::new(name => "org.example.music.UnknownFormat", message => "Unknown track encoding format"); } package Music::Player::Engine; ...snip... # Play either mp3 or ogg music tracks, otherwise # thrown an error sub play { my $self = shift; my $url = shift; if ($url =~ /.(mp3|ogg)$/) { ...play the track } else { die Music::Player::UnknownFormat->new(); } } DESCRIPTION
This objects provides for strongly typed error handling. Normally a service would simply call die "some message text" When returning the error condition to the calling DBus client, the message is associated with a generic error code or "org.freedesktop.DBus.Failed". While this suffices for many applications, occasionally it is desirable to be able to catch and handle specific error conditions. For such scenarios the service should create subclasses of the "Net::DBus::Error" object providing in a custom error name. This error name is then sent back to the client instead of the genreic "org.freedesktop.DBus.Failed" code. METHODS
my $error = Net::DBus::Error->new(name => $error_name, message => $description); Creates a new error object whose name is given by the "name" parameter, and long descriptive text is provided by the "message" parameter. The "name" parameter has certain formatting rules which must be adhered to. It must only contain the letters 'a'-'Z', '0'-'9', '-', '_' and '.'. There must be at least two components separated by a '.', For example a valid name is 'org.example.Music.UnknownFormat'. $error->name Returns the DBus error name associated with the object. $error->message Returns the descriptive text/message associated with the error condition. $error->stringify Formats the error as a string in a manner suitable for printing out / logging / displaying to the user, etc. AUTHOR
Daniel P. Berrange COPYRIGHT
Copyright (C) 2005-2011 Daniel P. Berrange SEE ALSO
Net::DBus, Net::DBus::Object perl v5.14.2 2011-06-30 Net::DBus::Error(3pm)