I've made an application that obeys UDP using Datagram Socket in android. I'm trying to use Camera's setPreviewCallback function to send bytes to a (c#) client, using Datagram Socket;
But,
The problem is : it throws an exception "The datagram was too big to fit the specified buffer,so truncated" and no bytes are received on client.
I've changed the size of buffer to different values but none work. Now :
Is Datagram approach is right?
What alternatives/approach I'd use to achieve the task?
What's the ideal solution for this?
Android Server :
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
videoView = (VideoView) findViewById(R.id.videoView1);
start = (Button)findViewById(R.id.start);
stop = (Button)findViewById(R.id.stop);
setTitle(GetCurrentIP());
mainList = new LinkedList<byte[]>();
secondaryList = new LinkedList<byte[]>();
mCam = null;
mCam = Camera.open();
if (mCam == null) {
Msg("Camera is null");
} else {
if (!Bind()) {
Msg("Bind Error.");
} else {
Msg("Bound Success.");
start.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
try {
mCam.setPreviewDisplay(videoView.getHolder());
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
Msg(e1.getMessage());
}
mCam.setPreviewCallback(new PreviewCallback() {
@Override
public void onPreviewFrame(byte[] data, Camera camera) {
// TODO Auto-generated method stub
DatagramPacket pack;
try {
pack = new DatagramPacket(data, data.length, InetAddress.getByName(clientIP), clientPort);
me.send(pack);
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Msg(e.getMessage());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Msg(e.getMessage());
}
}
});
mCam.startPreview();
}
});
}
}
}
private boolean Bind(){
try {
me = new DatagramSocket(MY_PORT);
return true;
} catch (SocketException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Msg(e.getMessage());
}
return false;
}
private String GetCurrentIP(){
WifiManager wifiMgr = (WifiManager) getSystemService(WIFI_SERVICE);
return Formatter.formatIpAddress(wifiMgr.getConnectionInfo().getIpAddress());
}
public void Msg(String msg){
Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_SHORT).show();
Log.v(">>>>>", msg);
}
}
C# client :
public partial class Form1 : Form
{
const int MY_PORT = 55566;
IPAddress MY_IP;
Thread Receiver;
Socket me;
EndPoint myEndPoint;
EndPoint serverEndPoint;
byte[] buffer;
public Form1()
{
InitializeComponent();
}
private IPAddress GetCurrentIPAddress()
{
IPAddress[] ips = Dns.GetHostAddresses(Dns.GetHostName());
var selectedIPs = from ip in ips
where ip.AddressFamily == AddressFamily.InterNetwork
select ip;
return selectedIPs.First();
}
private bool Bind()
{
try
{
myEndPoint = new IPEndPoint(MY_IP, MY_PORT);
me.Bind(myEndPoint);
return true;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
return false;
}
private void Form1_Load(object sender, EventArgs e)
{
try
{
MY_IP = GetCurrentIPAddress();
this.Text = MY_IP.ToString()+":"+MY_PORT;
me = new Socket
(
AddressFamily.InterNetwork,
SocketType.Dgram,
ProtocolType.Udp
);
if (!Bind())
Task.Run(()=> MessageBox.Show("Bind() error."));
else
Task.Run(() => MessageBox.Show("Bind success."));
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
//private void AddToListBox(String msg)
//{
// this.Invoke((Action)delegate() { this.listBox1.Items.Add((this.listBox1.Items.Count+1)+" : "+msg); });
//}
private void buttonStart_Click(object sender, EventArgs e)
{
serverEndPoint = new IPEndPoint(IPAddress.Parse(textBoxmyIP.Text), int.Parse(textBoxmyPort.Text));
Receiver = new Thread(new ThreadStart(Receive));
Receiver.Start();
}
private Image ByteToImage(byte[] bytes)
{
MemoryStream ms = new MemoryStream(bytes);
return Image.FromStream(ms);
}
private void Receive()
{
while (true)
{
buffer = new byte[100];
int nobs = me.ReceiveFrom(buffer, ref serverEndPoint);
if (nobs>0)
{
Task.Run(() => MessageBox.Show("Bytes received"));
//AddToListBox(Encoding.Default.GetString(buffer));
//AddToPictureBox(buffer);
}
Thread.Sleep(100);
}
}
private void AddToPictureBox(byte[] buffer)
{
this.BeginInvoke
(
(Action)
delegate()
{
pictureBox1.Image = ByteToImage(buffer);
}
);
}
}