implemented get/set methods

master
Jakub Kuźma 2011-05-31 19:25:18 +02:00
parent 4a4769822e
commit e7db196a29
2 changed files with 55 additions and 5 deletions

View File

@ -32,6 +32,61 @@ module Sane
API.sane_close(device_handle)
end
def get_option_descriptor(device_handle, option)
result = API.sane_get_option_descriptor(device_handle, option)
API::OptionDescriptor.new(result)
end
def get_option(device_handle, option)
descriptor = get_option_descriptor(device_handle, option)
case descriptor[:type]
when :string
value_pointer = FFI::MemoryPointer.new(:pointer)
when :bool, :int, :fixed
value_pointer = FFI::MemoryPointer.new(:int)
else
return nil
end
check_status!(API.sane_control_option(device_handle, option, :get_value, value_pointer, FFI::Pointer::NULL))
case descriptor[:type]
when :string
value_pointer.read_string
when :bool
!value_pointer.read_int.zero?
when :int, :fixed
value_pointer.read_int
end
end
def set_option(device_handle, option, value)
descriptor = get_option_descriptor(device_handle, option)
case descriptor[:type]
when :string
value_pointer = FFI::MemoryPointer.from_string(value)
when :int, :fixed
value_pointer = FFI::MemoryPointer.new(:int).write_int(value)
when :bool
value_pointer = FFI::MemoryPointer.new(:int).write_int(value ? 1 : 0)
else
return nil
end
check_status!(API.sane_control_option(device_handle, option, :set_value, value_pointer, FFI::Pointer::NULL))
case descriptor[:type]
when :string
value_pointer.read_string
when :bool
!value_pointer.read_int.zero?
when :int, :fixed
value_pointer.read_int
end
end
def check_status!(status)
raise Error.new(API.sane_strstatus(status), status) if status != :good
end

View File

@ -1,5 +0,0 @@
module Scanner
module Sane
end
end