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ReceiveFromMax.java
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ReceiveFromMax.java
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//
// Copyright 2013 Frederik Vanggaard
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//
// ReceiveFromMax.java
//
//
// Created by Frederik Vanggaard on 2013/04/29
//
// Contact: contact@drudoo.com
//
//
/*----------------------------
Known Bugs:
* Can't use values higher than 65535. 65536 is 0. 65537 is 1 and so on.
* Doesn't like negative values. -1 is 65535. -2 is 65534 and so on.
* Can't use floats or doubles. Only accepts Integers from Max.
-----------------------------*/
import java.io.*;
import java.net.*;
public class ReceiveFromMax {
private int integerNumberFirst;
private int integerNumberSecond;
private int integerNumberTotal;
private int port;
/* Used for tentative float calculations. Not yet supported
private double a = 0;
private double b = 0;
private double c = 0;
private double d = 0;
*/
public ReceiveFromMax(int port) { //The constructor needs a number as argument. This number will be the port.
this.port = port;
returnData();
}
public int getReturnData() { //Instead of using public variables we use a kind of get/set.
if (integerNumberTotal == 0) {
integerNumberTotal = 1; //Can't use 0. Remove if-statement if you want to use 0.
}
/* Use if you want to have negative numbers from -1 to -5535. Positive numbers will go from 1-59999.
if (integerNumberTotal >= 60000) {
integerNumberTotal = integerNumberTotal-65536;
}
*/
return integerNumberTotal;
}
private void closeConnection(DatagramSocket socket) { //Always close the connection so it can be reused on the same port.
socket.disconnect();
socket.close();
}
private int returnData() {
try {
DatagramSocket socket = new DatagramSocket(port); //Set up the connection.
byte[] buffer = new byte[512]; //Create a buffer
for (; ; ) { //Run a for loop until we receive a number from Max 6.
DatagramPacket packet = new DatagramPacket(buffer, buffer.length); //Create a new packet and store it in the buffer with the buffer length.
socket.receive(packet); //Receive the data from the socket (port) and store it in the packet.
ByteArrayInputStream bin = new ByteArrayInputStream(packet.getData()); //Make a new bytearray from the packets data.
boolean isFloat = false;
for (int i = 0; i < packet.getLength(); i++) { //Run through the packet and read the data.
int data = bin.read(); //Read the next byte of data from this input steam.
if (data == -1) { //If the data is equal to -1, we have reached EOF.
break;
} else {
if (packet.getLength() > 12) {
//Our number is a float and cannot be translated or returned.
/* Tentative float calculations.
if (i == 12) {
switch ((int)data) {
case 61: a = 0.03125;
break;
case 62: a = 0.125;
break;
case 63: a = 0.5;
break;
case 64: a = 2;
break;
case 65: a = 8;
break;
case 66: a = 32;
break;
case 67: a = 128;
break;
}
}
if (i == 13) b = (int) data;
if (i == 14) c = (int) data;
if (i == 15) d = (int) data;
*/
isFloat = true;
}
if (packet.getLength() < 13) {
if (i == 10) integerNumberSecond = (int) data;
if (i == 11) integerNumberFirst = (int) data;
}
}
}
if (isFloat) {
/* Used for tentative float calculations. Not yet supported.
if b or c or d is larger than 128 we will have a margin of error -/+ 0.1-0.25.
double temp;
temp = a + ((b/128)*a) + ((c/128)*(a/256)) + ((d/128)*(a/(256*256)));
System.out.println(temp);
*/
System.out.println("Trying to parse float value...\nCannot return value");
closeConnection(socket);
break;
}
integerNumberTotal = (256*integerNumberSecond)+integerNumberFirst;
closeConnection(socket);
break;
}
} catch(Exception e) {
System.out.println("\n_______\tERROR MESSAGE START...\t____");
System.out.println("\t" + e.getMessage());
System.out.println("_______\tERROR MESSAGE ENDS...\t____\n");
}
return 0;
}
}