Fiddle::CStructBuilder

用于构建C类（CUnion，CStruct等）

Fiddle :: Importer＃struct和Fiddle :: Importer＃union以易于使用的方式包装此功能。

公共类方法

create(klass, types, members) Show source

构建一个新的类，给出一个C：

• class klass (CUnion, CStruct, or other that provide an entity_class)

• types (Fiddle::TYPE_INT, Fiddle::TYPE_SIZE_T, etc., see the C types constants)

• corresponding membersFiddle::Importer#struct and Fiddle::Importer#union wrap this functionality in an easy-to-use manner.
• 示例：require 'fiddle/struct' require 'fiddle/cparser' 包括 Fiddle::CParser types, members = parse_struct_signature(['int i','char c']) MyStruct = Fiddle::CStructBuilder.create(Fiddle::CUnion, types, members) obj = MyStruct.allocate# File ext/fiddle/lib/fiddle/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(" def new_class.size() #{size} end def new_class.malloc() addr = Fiddle.malloc(#{size}) new(addr) end ", __FILE__, __LINE__+1) return new_class endPrivate Instance Methods create(klass, types, members)
• 显示源构建一个新的类给出一个C：

• class klass (CUnion, CStruct, or other that provide an entity_class)

• types (Fiddle::TYPE_INT, Fiddle::TYPE_SIZE_T, etc., see the C types constants)

• corresponding members

Fiddle :: Importer＃struct和Fiddle :: Importer＃union以易于使用的方式包装此功能。

例：

require 'fiddle/struct'
require 'fiddle/cparser'

include Fiddle::CParser

types, members = parse_struct_signature(['int i','char c'])

MyStruct = Fiddle::CStructBuilder.create(Fiddle::CUnion, types, members)

obj = MyStruct.allocate

# File ext/fiddle/lib/fiddle/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("        def new_class.size()
          #{size}
        end
        def new_class.malloc()
          addr = Fiddle.malloc(#{size})
          new(addr)
        end
", __FILE__, __LINE__+1)
      return new_class
    end