package adsjava;



	import de.beckhoff.jni.Convert;
	import de.beckhoff.jni.JNIByteBuffer;
	import de.beckhoff.jni.tcads.AmsAddr;
	import de.beckhoff.jni.tcads.AdsCallDllFunction;

	public class ads
	{
	    public static void main(String[] args)
	    {
	        long nPort, nErr;
	        AmsAddr addr = new AmsAddr();
	        JNIByteBuffer dataBuff = new JNIByteBuffer(200);

	        // Open communication
	        nPort = AdsCallDllFunction.adsPortOpen();
	        nErr = AdsCallDllFunction.getLocalAddress(addr);
	        addr.setPort(801);
	        if(nErr!=0) { System.out.println("Error: Open Communication: 0x"
	                                            + Long.toHexString(nErr)); }

	        // Read value by IndexGroup and IndexOffset
	        nErr = AdsCallDllFunction.adsSyncReadReq(addr,
	                                            0x4040,     // Index Group
	                                            0x0,        // Index Offset
	                                            200,
	                                            dataBuff);
	        if(nErr!=0)
	        {
	            System.out.println("Error: Read by handle: 0x"
	                                + Long.toHexString(nErr));
	        }
	        else
	        {
	            for (int i = 0; i < dataBuff.getUsedBytesCount(); i=i+2)
	            {
	                // PLC datatype int consists of two bytes. Get them.
	                byte lowByte = dataBuff.getByteArray()[i];
	                byte highByte = dataBuff.getByteArray()[i+1];
	                // Create new byte[]. Little endian!
	                byte[] valBytes = { lowByte, highByte };
	                // Integer value: byte[] to int
	                int valInt = Convert.ByteArrToShort(valBytes);
	                System.out.println("Value of PLCVar[" + i/2 + "]: " + valInt);
	            }
	        }

	        // Close communication
	        nErr = AdsCallDllFunction.adsPortClose();
	        if(nErr!=0) { System.out.println("Error: Close Communication: 0x"
	                                            + Long.toHexString(nErr)); }

	        try{
	            System.in.read();
	        }
	        catch (Exception e){
	            System.out.println("Error: Close program");
	        }
	    }


}