improvements

README.rdoc

@@ -1,6 +1,6 @@
 = SANE FFI
 
-Scanner Access Now Easier in Ruby.
+Scanner Access Now Easier in Ruby using FFI. This gem provides bindings
 
 == Copyright
 

lib/sane.rb

@@ -155,6 +155,14 @@ class Sane
     API::Parameters.new(parameters_pointer).to_hash
   end
 
+  def set_io_mode(handle, non_blocking)
+    check_status!(API.sane_set_io_mode(handle, non_blocking ? 1 : 0))
+  end
+
+  def cancel(handle)
+    API.sane_cancel(handle)
+  end
+
   def ensure_not_initialized!
     raise("SANE library is already initialized") if initialized?
   end

lib/sane/device.rb

@@ -1,5 +1,7 @@
 class Sane
   class Device
+    attr_reader :name, :vendor, :model, :type
+
     def initialize(options)
       @name = options[:name]
       @vendor = options[:vendor]
@@ -44,6 +46,21 @@ class Sane
       Sane.instance.send(:read, @handle)
     end
 
+    def cancel
+      ensure_open!
+      Sane.instance.send(:cancel, @handle)
+    end
+
+    def sync
+      ensure_open!
+      Sane.instance.send(:set_io_mode, @handle, false)
+    end
+
+    def async
+      ensure_open!
+      Sane.instance.send(:set_io_mode, @handle, true)
+    end
+
     def option_count
       ensure_open!
       Sane.instance.send(:get_option, @handle, 0)
@@ -76,16 +93,18 @@ class Sane
       option_count.times.map do |i|
         begin
           self[i]
-        rescue Error
-          nil # we can't read values of some options (i.e. buttons), ignore them
+        rescue Error => e
+          if e.status == :inval
+            nil # we can't read values of some options (i.e. buttons), ignore them
+          else
+            raise e
+          end
         end
       end
     end
 
     def options
-      result = {}
-      option_count.times { |i| hash[option_names[i]] = option_values[i] }
-      result
+      Hash[*option_names.zip(option_values).flatten]
     end
 
     def option_lookup(option_name)

lib/sane/version.rb

@@ -1,3 +1,3 @@
-module Sane
+class Sane
   VERSION = "0.1.0"
 end