Class: Win32API

Inherits:
Object
  • Object
show all
Defined in:
lib/Win32API.rb

Constant Summary collapse

DLL =
{}
TYPEMAP =
{"0" => Fiddle::TYPE_VOID, "S" => Fiddle::TYPE_VOIDP, "I" => Fiddle::TYPE_LONG}
POINTER_TYPE =
Fiddle::SIZEOF_VOIDP == Fiddle::SIZEOF_LONG_LONG ? 'q*' : 'l!*'

Instance Method Summary collapse

Constructor Details

#initialize(dllname, func, import, export = "0", calltype = :stdcall) ⇒ Win32API

Returns a new instance of Win32API.


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# File 'lib/Win32API.rb', line 13

def initialize(dllname, func, import, export = "0", calltype = :stdcall)
  @proto = [import].join.tr("VPpNnLlIi", "0SSI").sub(/^(.)0*$/, '\1')
  handle = DLL[dllname] ||= Fiddle.dlopen(dllname)

  @func = Fiddle::Function.new(
    handle[func],
    @proto.chars.map { |win_type| TYPEMAP[win_type.tr("VPpNnLlIi", "0SSI")] },
    TYPEMAP[export.tr("VPpNnLlIi", "0SSI")],
    Fiddle::Importer.const_get(:CALL_TYPE_TO_ABI)[calltype]
  )
rescue Fiddle::DLError => e
  raise LoadError, e.message, e.backtrace
end

Instance Method Details

#call(*args) ⇒ Object Also known as: Call


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# File 'lib/Win32API.rb', line 27

def call(*args)
  import = @proto.split("")
  args.each_with_index do |x, i|
    args[i], = [x == 0 ? nil : x].pack("p").unpack(POINTER_TYPE) if import[i] == "S"
    args[i], = [x].pack("I").unpack("i") if import[i] == "I"
  end
  ret, = @func.call(*args)
  return ret || 0
end