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import ctypes
import os
import string


class Logo:
    
    def __init__(self, ip, port):
        self.ip = ip
        self.port = port
        self.ph = 0         # Porthandle
        self.di = 0         # Dave Interface Handle
        self.dc = 0
        self.res = 1
        self.rack = 1       
        self.slot = 0
        self.mpi = 2
        self.dave = ""
        self.daveDB = 132
        #Pfad zur DLL
        Dateipfad = os.getcwd() 
        #DLL_LOC = Dateipfad + '/' + ('libnodave.so')
              
        if os.name == 'nt':
            DLL_LOC = Dateipfad + '/' + ('libnodave.dll')
            self.dave = ctypes.cdll.LoadLibrary(DLL_LOC)
        if os.name == 'posix':
            DLL_LOC = Dateipfad + '/' + ('libnodave.so')
            self.dave = ctypes.cdll.LoadLibrary(DLL_LOC)
        print
        print "******************************************************************"
        print "  Betriebssystem: ",os.name
        print "  Pfad zur DLL:   ",DLL_LOC
        print "******************************************************************"
            
    
    def connect(self):        
        # Open connection
        print 
        print "- Try open connection"
        self.ph = self.dave.openSocket(self.port, self.ip)
        if self.ph > 0:
            print "- Port Handle O.K."
        else:
            print "- Port Handle N.O.K."
            
        # Dave Interface handle
        self.di = self.dave.daveNewInterface(self.ph, self.ph, 'IF1', 0,  122 , 2)
        print "- Dave Interface Handle :", self.di
        
        # Init Adapter
        self.res = self.dave.daveInitAdapter(self.di)
        if self.res == 0:
            print "- Init Adapter O.K."
        else:
            print "- Init Adapter N.O.K."
            
        # dave Connection
        self.dc = self.dave.daveNewConnection(self.di, self.mpi, self.rack, self.slot )       # daveNewConnection(di, MPI, rack, slot)
        print "- Dave Connection: ", self.dc
        
        self.res = self.dave.daveConnectPLC(self.dc)
        self.dave.daveSetTimeout(self.di, 5000000)
        print "- res: ", self.res
        
        
    def readbytes(self, db, start, len):
        print "- read"
        print
        #daveReadBytes(daveConnection, int area, int DB, int start, int len, void * buffer);
        if self.res == 0:
            rd = self.dave.daveReadBytes(self.dc, self.daveDB ,db,start,len, 0)
            
            print "ReadBytes: ",len #+ str(self.res)
            for z in range(len):                
                a=self.dave.daveGetU16(self.dc)
                print z," ", a
            
        else:
            print "Bitte erst Verbindung Ueber C O N N E C T  aufbauen"
            
    def writebytes(self, db, wort, wert):
        print "- write"
        print
        u=self.dave.daveSwapIed_16(wert) 
        buffer = ctypes.c_int(int(u))
        buffer_p =  ctypes.pointer(buffer)
        #a.write_bytes(132, 1, wort, 2, buffer_p)
        a = self.dave.daveWriteManyBytes(self.dc, self.daveDB, db, wort,2, buffer_p)
        #a.write_bytes(132, 1, wort, 3, buffer_p)
    
    def disconnect(self):
        self.dave.daveDisconnectPLC(self.dc);
        self.dave.closePort(self.ph)
        print
        print "- Verbindung zur SPS beendet"







def main():
    plc = Logo('172.21.30.46', 102)
    plc.connect()

    plc.readbytes(1,0,10)
    #plc.writebytes(1,10,4040)
    plc.disconnect()
	
	

if __name__ == '__main__':
	main()