Class: Undll32::Win32API

Inherits:
Object
  • Object
show all
Defined in:
lib/undll32.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!*'
WIN32_TYPES = 
'VPpNnLlIi'
DL_TYPES = 
'0SSI'

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/undll32.rb', line 21

def initialize(dllname, func, import, export = '0', calltype = :stdcall)
  @proto = [import].join.tr(WIN32_TYPES, DL_TYPES).sub(/^(.)0*$/, '\1')
  import = @proto.chars.map { |e| TYPEMAP[e.tr(WIN32_TYPES, DL_TYPES)] }
  export = TYPEMAP[export.tr(WIN32_TYPES, DL_TYPES)]
  calltype = Fiddle::Importer.const_get(:CALL_TYPE_TO_ABI)[calltype]
  handle = DLL[dllname] ||=
    begin
      Fiddle.dlopen(dllname)
    rescue Fiddle::DLError
      raise unless File.extname(dllname).empty?
      Fiddle.dlopen("#{dllname}.dll")
    end
  @func = Fiddle::Function.new(handle[func], import, export, 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/undll32.rb', line 38

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