Method: Win::Gui::Window.return_string

Defined in:
lib/win/gui/window.rb

.return_string(encode = nil) ⇒ Object

Helper method that creates def_block returning (possibly encoded) string as a result of api function call or nil if zero characters was returned by api call



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# File 'lib/win/gui/window.rb', line 85

def return_string( encode = nil )  #:nodoc:
  lambda do |api, *args|
    namespace.enforce_count( args, api.prototype, -2)
    buffer = FFI::MemoryPointer.new :char, 1024
    args += [buffer, buffer.size]
    num_chars = api.call(*args)
    return nil if num_chars == 0
    if encode
      string = buffer.get_bytes(0, num_chars*2)
      string = string.force_encoding('utf-16LE').encode(encode)
    else
      string = buffer.get_bytes(0, num_chars)
    end
    string.rstrip
  end
end