NAME

       Glib::Error -  Exception Objects based on GError

SYNOPSIS

         eval {
            my $pixbuf = Gtk2::Gdk::Pixbuf->new_from_file ($filename);
            $image->set_from_pixbuf ($pixbuf);
         };
         if ($@) {
            print "$@\n";
            if (Glib::Error::matches ($@, 'Gtk2::Gdk::Pixbuf::Error',
                                          'unknown-format')) {
               change_format_and_try_again ();
            } elsif (Glib::Error::matches ($@, 'Glib::File::Error', 'noent')) {
               change_source_dir_and_try_again ();
            } else {
               # don't know how to handle this
               die $@;
            }
         }

DESCRIPTION

       Gtk2-Perl translates GLib's GError runtime errors into Perl exceptions, by creating exception objects
       based on Glib::Error.  Glib::Error overloads the stringification operator, so a Glib::Error object will
       act like a string if used with print() or warn(), so most code using $@ will not even know the
       difference.

       The point of having exception objects, however, is that the error messages in GErrors are often localized
       with NLS translation.  Thus, it's not good for your code to attempt to handle errors by string matching
       on the the error message.  Glib::Error provides a way to get to the deterministic error code.

       You will typically deal with objects that inherit from Glib::Error, such as Glib::Convert::Error,
       Glib::File::Error, Gtk2::Gdk::Pixbuf::Error, etc; these classes are provided by the libraries that define
       the error domains.  However, it is possible to get a base Glib::Error when the bindings encounter an
       unknown or unbound error domain.  The interface used here degrades nicely in such a situation, but in
       general you should submit a bug report to the binding maintainer if you get such an exception.

HIERARCHY

         Glib::Boxed
         +----Glib::Error

METHODS

   scalar = Glib::Error::new ($class, $code, $message)
   scalar = $class->new ($code, $message)
       •   $code (Glib::Enum) an enumeration value, depends on $class

       •   $message (string)

       Create a new exception object of type $class, where $class is associated with a GError domain.  $code
       should be a value from the enumeration type associated with this error domain.  $message can be anything
       you like, but should explain what happened from the point of view of a user.

   integer = $error->code
       This is the numeric error code.  Normally, you'll want to use "value" instead, for readability.

   string = $error->domain
       The error domain.  You normally do not need this, as the object will be blessed into a corresponding
       class.

   string = $error->location
       The source line and file closest to the emission of the exception, in the same format that you'd get from
       croak() or die().

       If there's non-ascii characters in the filename Perl leaves them as raw bytes, so you may have to put the
       string through Glib::filename_display_name for a wide-char form.

   boolean = $error->matches ($domain, $code)
       •   $domain (string)

       •   $code (scalar)

       Returns true if the exception in $error matches the given $domain and $code.  $domain may be a class name
       or domain quark (that is, the real string used in C).  $code may be an integer value or an enum nickname;
       the enum type depends on the value of $domain.

   string = $error->message
       The error message.  This may be localized, as it is intended to be shown to a user.

   Glib::Error::register ($package, $enum_package)
       •   $package (string) class name to register as a Glib::Error.

       •   $enum_package (string) class name of the enum type to use for this domain's error codes.

       Register a new error domain.  Glib::Error will be added @package::ISA for you.  enum_package must be a
       valid Glib::Enum type, either from a C library or registered with "Glib::Type::register_enum".  After
       registering an error domain, you can create or throw exceptions of this type.

   scalar = Glib::Error::throw ($class, $code, $message)
   scalar = $class->throw ($code, $message)
       •   $code (Glib::Enum) an enumeration value, depends on $class

       •   $message (string)

       Throw an exception with a Glib::Error exception object.  Equivalent to "croak (Glib::Error::new ($class,
       $code, $message));".

   string = $error->value
       The enumeration value nickname of the integer value in "$error->code", according to this error domain.
       This will not be available if the error object is a base Glib::Error, because the bindings will have no
       idea how to get to the correct nickname.

SEE ALSO

       Glib, Glib::Boxed

COPYRIGHT

       Copyright (C) 2003-2011 by the gtk2-perl team.

       This software is licensed under the LGPL.  See Glib for a full notice.