Hallo,
ich brauch dazu relativ wenig schreiben. Soll ein Programm werden, was von mehreren Computern Live anzeigen soll. Quellcode (bis auf den von TableLayout.jar (LayoutManager))
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.net.*;
import javax.imageio.ImageIO;
import javax.swing.*;
import layout.TableLayout;
public class index {
/**
* @param args
*/
public static void main(String[] args) {
String[] opt1 = {„Client“,„Server“};
if(JOptionPane.showOptionDialog(null, „Ist der Rechner…“, „LAN-View v0.1 alpha“,JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null, opt1, 0) == 0){
String server = „“;
while(server == „“){
server = JOptionPane.showInputDialog(null, „Die Serveranwendung muss spätestens jetzt gestartet worden sein.\nGeben Sie die Server-IP ein:“);
boolean x = false;
InetAddress ia = null;
try {
ia = InetAddress.getByName(server);
} catch (UnknownHostException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
int cport = 1250;
JFrame clientframe = new JFrame();
clientframe.setBounds(0, 0, 500, 0);
clientframe.setTitle(„Lan-Viewer: Client (Server: „+server+“) Dieses Fenster zum Beenden schließen.“);
clientframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
clientframe.setVisible(true);
while(x == false){
try {
byte[] data_ = image_create();
System.out.println(data_.length);
DatagramPacket packet1 = new DatagramPacket( data_, data_.length, ia, cport );
DatagramSocket toSocket1;
toSocket1 = new DatagramSocket();
toSocket1.send( packet1 );
} catch (Exception e) {
e.printStackTrace();
}
}
}
} else {
int zeilen = Integer.parseInt(JOptionPane.showInputDialog(null, „Wieviele Zeilen?\n(quer)“));
int spalten = Integer.parseInt(JOptionPane.showInputDialog(null, „Wieviele Spalten?\n(hoch)“));
JOptionPane.showMessageDialog(null, spalten);
JFrame serverframe = new JFrame();
serverframe.setTitle(„LAN-View: Server (“ + getOwnIP() +") [Dieses Fester zum Beenden schließen]");
serverframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
serverframe.setVisible(true);
serverframe.setBounds(0, 0, 300, 200);
JLabel[] labels = new JLabel[spalten*zeilen];
ImageIcon[] imgs = new ImageIcon[spalten*zeilen];
double[][] ld = new double[spalten][zeilen*2];
for(int i = 0; i
Terminal:
0
Exception in thread „main“ java.lang.NullPointerException
at java.awt.Container.addImpl(Unknown Source)
at java.awt.Container.add(Unknown Source)
at javax.swing.JFrame.addImpl(Unknown Source)
at java.awt.Container.add(Unknown Source)
at index.main(index.java:79)