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)); }
	        
	        byte[] btSymName = "Main.strText".getBytes();
	        JNIByteBuffer symbuff = new JNIByteBuffer(btSymName.length);
	        symbuff.setByteArray(btSymName);
	        final int buffsize = 256; //String
	        JNIByteBuffer databuff = new JNIByteBuffer(buffsize);
	        JNIByteBuffer hdlbuff = new JNIByteBuffer(4);
	         nErr = 0;
	        int symHandle = 0;

	     
	          //get handle by symbol name (symbol like "MAIN.iCounter" name in symbuff)
	          nErr = AdsCallDllFunction.adsSyncReadWriteReq(addr, 0xF003, 0x0,
	              hdlbuff.getUsedBytesCount(), hdlbuff,  //buffer for getting handle
	              symbuff.getUsedBytesCount(), symbuff); //buffer containg symbolpath
	          byte[] byteArr = new byte[4];
	          byteArr = hdlbuff.getByteArray();
	          symHandle = Convert.ByteArrToInt(byteArr);

	          // read variable by handle
	          nErr = AdsCallDllFunction.adsSyncReadReq(addr, 0xF005, symHandle,
	            databuff.getUsedBytesCount(), databuff);

	          byte[] byteArr1 = new byte[buffsize];
	          byteArr1 = databuff.getByteArray();
	          String strVal = Convert.ByteArrToString(byteArr1);
	          System.out.print(strVal);

	      

	        // 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");
	        }
	    }


}