Module: Fzeet::Windows::COM::Callback

Defined in:

lib/fzeet/windows/com/Common.rb

Class Method Summary

• .[](iface) ⇒ Object

Class Method Details

.[](iface) ⇒ Object

# File 'lib/fzeet/windows/com/Common.rb', line 213

def self.[](iface)
  Class.new(iface) {
    send(:include, Helpers)

    def initialize(opts = {})
      @vtbl, @refc = self.class::VTBL.new, 1

      @vtbl.members.each { |name|
        @vtbl[name] = instance_variable_set("@fn#{name}",
          FFI::Function.new(*@vtbl.class::SPEC[name].reverse, convention: :stdcall) { |*args|
            send(name, *args[1..-1])
          }
        )
      }

      self[:lpVtbl] = @vtbl

      begin
        yield self
      ensure
        Release()
      end if block_given?
    end

    attr_reader :vtbl, :refc

    def QueryInterface(riid, ppv)
      if [IUnknown::IID, self.class::IID].any? { |iid| Windows.memcmp(riid, iid, iid.size) == 0 }
        ppv.write_pointer(self)
      else
        ppv.write_pointer(0); return E_NOINTERFACE
      end

      AddRef(); S_OK
    end

    def AddRef
      @refc += 1
    end

    def Release
      @refc -= 1
    end

    (self::VTBL.members - IUnknown::VTBL.members).each { |name|
      define_method(name) { |*args|
        E_NOTIMPL
      }
    }
  }
end