Module: WindowsCOM::COMCallback

Defined in:

lib/windows_com/common.rb

Class Method Summary

• .[](iface) ⇒ Object

Class Method Details

.[](iface) ⇒ Object

# File 'lib/windows_com/common.rb', line 228

def self.[](iface)
	Class.new(iface) {
		def initialize
			@vtbl = self.class::Vtbl.new
			@vtbl.members.each { |name|
				@vtbl[name] = instance_variable_set("@__ffi_func__#{name}",
					FFI::Function.new(*@vtbl.class::Spec[name].reverse, convention: :stdcall) { |*args|
						__send__(name, *args[1..-1]) # remove *this* pointer from Ruby meth call
					}
				)
			}

			@vptr = WindowsCOM::COMVptr_.new
			@vptr[:lpVtbl] = @vtbl

			@refc = 0
			AddRef()
		end

		attr_reader :refc

		def QueryInterface(iid, ppv)
			unless self.class::IID == iid || WindowsCOM::IUnknown::IID == iid
				STDERR.puts "#{self}.#{__method__} called with unsupported interface id (IID: #{iid})" if $DEBUG

				ppv.write_pointer(0)
				return WindowsCOM::E_NOINTERFACE
			end

			ppv.write_pointer(@vptr)
			AddRef()
			WindowsCOM::S_OK
		end

		def AddRef
			@refc += 1

			STDERR.puts "#{self}.#{__method__} (@refc: #{@refc})" if
				$DEBUG || WINDOWS_COM_TRACE_CALLBACK_REFCOUNT

			@refc
		end

		def Release
			@refc -= 1

			STDERR.puts "#{self}.#{__method__} (@refc: #{@refc})" if
				$DEBUG || WINDOWS_COM_TRACE_CALLBACK_REFCOUNT

			if @refc == 0
				@vtbl.pointer.free
				@vptr.pointer.free

				STDERR.puts "#{self} refcount is 0, #{@vtbl} and #{@vptr} freed" if
					$DEBUG || WINDOWS_COM_TRACE_CALLBACK_REFCOUNT
			end

			@refc
		end

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