socket programming in android got Fatal Exception

Question

I tried to get the image from my pc so that I wrote C# and android code to do that.

But when I start running, I got fatal exception from my android. I can't figure out what it's meaning...

18469-18469/roman10.tutorial.tcpcommserver E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.RuntimeException: Unable to start activity ComponentInfo{roman10.tutorial.tcpcommserver/roman10.tutorial.tcpcommserver.TcpServer}: java.lang.NegativeArraySizeException: -1991225785
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java)
            at android.app.ActivityThread.access$600(ActivityThread.java)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java)
            at android.os.Handler.dispatchMessage(Handler.java)
            at android.os.Looper.loop(Looper.java)
            at android.app.ActivityThread.main(ActivityThread.java)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.NegativeArraySizeException: -1991225785
            at roman10.tutorial.tcpcommserver.TcpServer.readBytes(TcpServer.java:72)
            at roman10.tutorial.tcpcommserver.TcpServer.runTcpServer(TcpServer.java:54)
            at roman10.tutorial.tcpcommserver.TcpServer.onCreate(TcpServer.java:27)
            at android.app.Activity.performCreate(Activity.java)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java)
            at android.app.ActivityThread.access$600(ActivityThread.java)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java)
            at android.os.Handler.dispatchMessage(Handler.java)
            at android.os.Looper.loop(Looper.java)
            at android.app.ActivityThread.main(ActivityThread.java)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java)
            at dalvik.system.NativeStart.main(Native Method)

And this is my android code

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        imageView = (ImageView) this.findViewById(R.id.imageView);
        try{
            runTcpServer();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static final int TCP_SERVER_PORT = 13233;
    private void runTcpServer() throws IOException {

        ServerSocket serverSocket = null;

        try {
            serverSocket = new ServerSocket(TCP_SERVER_PORT);
        } catch (IOException ex) {
            System.out.println("Can't setup server on this port number. ");
        }

        Socket socket = null;
        InputStream in = null;
        try {
            socket = serverSocket.accept();
        } catch (IOException ex) {
            System.out.println("Can't accept client connection. ");
        }

        try {
            in = socket.getInputStream();
            byte[] imageData = readBytes(in);
            Bitmap bmp = BitmapFactory.decodeByteArray(imageData, 0, imageData.length);
            imageView.setImageBitmap(bmp);
        } catch (IOException ex) {
            System.out.println("Can't get socket input stream. ");
        }

        in.close();
        socket.close();
        serverSocket.close();

    }

    public byte[] readBytes(InputStream in) throws IOException {
        DataInputStream dis = new DataInputStream(in);

        int len = dis.readInt();
        byte[] data = new byte[len];
        if (len > 0) {
            dis.readFully(data);
        }
        return data;
    }

Alexander · Accepted Answer · 2015-09-19 07:14:53Z

1

int len = dis.readInt();

Here len is negative for some reason

answered Sep 19, 2015 at 7:14

Alexander

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1 Comment

user207421 Over a year ago

@user5121761 Here len is negative for exactly one reason: you've reached end of stream. Similarly, there is exactly one solution. The test should be before the allocation.

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