from quickfix import *

def sendOrderCancelRequest:
        message = quickfix.Message();
        header = message.getHeader();

        header.setField(quickfix.BeginString("FIX.4.2"))
        header.setField(quickfix.SenderCompID(TW))
        header.setField(quickfix.TargetCompID("TARGET"))
        header.setField(quickfix.MsgType("D"))
        message.setField(quickfix.OrigClOrdID("123"))
        message.setField(quickfix.ClOrdID("321"))
        message.setField(quickfix.Symbol("LNUX"))
        message.setField(quickfix.Side(Side_BUY))
        message.setField(quickfix.Text("Cancel My Order!"))

        Session.sendToTarget(message)