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Used to construct C classes (CUnion, CStruct, etc)
DL::Importer#struct and DL::Importer#union wrap this functionality in an easy-to-use manner.
Construct a new class given a C:
class klass
(CUnion, CStruct, or
other that provide an entity_class)
types
(DL:TYPE_INT, DL::TYPE_SIZE_T, etc., see the C types
constants)
corresponding members
DL::Importer#struct and DL::Importer#union wrap this functionality in an easy-to-use manner.
Example:
require 'dl/struct' require 'dl/cparser' include DL::CParser types, members = parse_struct_signature(['int i','char c']) MyStruct = DL::CStructBuilder.create(CUnion, types, members) obj = MyStruct.allocate
# File dl/lib/dl/struct.rb, line 50 def create(klass, types, members) new_class = Class.new(klass){ define_method(:initialize){|addr| @entity = klass.entity_class.new(addr, types) @entity.assign_names(members) } define_method(:to_ptr){ @entity } define_method(:to_i){ @entity.to_i } members.each{|name| define_method(name){ @entity[name] } define_method(name + "="){|val| @entity[name] = val } } } size = klass.entity_class.size(types) new_class.module_eval(<<-EOS, __FILE__, __LINE__+1) def new_class.size() #{size} end def new_class.malloc() addr = DL.malloc(#{size}) new(addr) end EOS return new_class end