#!/usr/bin/perl -w
use Win32::EventLog;
$area = 'System';  # Default
$host = $ENV{'ComputerName'};

$log_handle = Win32::EventLog->new($area, $host)or die "Cannot open $area event log $!\n";

$log_handle->GetOldest($record_base) or die "Error getting oldest record, $!\n";

$log_handle->GetNumber($num_records) or die "Error getting number records, $!\n";

for ($rec = 0; $rec < $num_records; $rec++ ) {
    $log_handle->Read(EVENTLOG_FORWARDS_READ|EVENTLOG_SEEK_READ,
        $record_base + $rec,\%hash)or die "Cannot read event log entry $rec, $!\n";
    print_error_log( \%hash );
}

$log_handle->Close();

sub print_error_log {
    my($hash_ref) = $_[0];
    my(%hash) = %$hash_ref;
    my($time_str);
    my($time_value);

    if ( exists( $hash{'EventType'} ) ) {
        if ( $hash{'EventType'} eq EVENTLOG_ERROR_TYPE ) {
            my($source) = $hash{'Source'};
            $time_value = $hash{'TimeGenerated'};
            $time_str = localtime( $time_value );
            my($rec_number) = $hash{'RecordNumber'};
            my($msg) =Win32::EventLog::GetMessageText( \%hash );
            if (defined($msg) ) {
                print "    $rec_number $source $time_str\n";
                print "$msg\n";
            } else {
                # Print raw strings used to create message.
                print "    $rec_number $source $time_str\n";
                print "$hash{'Strings'}";
            }
        }
    }
}