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BluetoothSocket.cs
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BluetoothSocket.cs
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/*
* Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
*
* 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.
*/
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
namespace Tizen.Network.Bluetooth
{
/// <summary>
/// The IBluetoothServerSocket interface handles the server socket operations.
/// </summary>
/// <since_tizen> 3 </since_tizen>
public interface IBluetoothServerSocket
{
/// <summary>
/// Event handler to receive data over bluetooth socket.
/// This event occurs when the socket server receives data from the client.
/// </summary>
/// <since_tizen> 3 </since_tizen>
event EventHandler<SocketDataReceivedEventArgs> DataReceived;
/// <summary>
/// Event handler method to receive bluetooth socket connection state changed events.
/// This event occurs when the connection state between two devices is changed.
/// </summary>
/// <since_tizen> 3 </since_tizen>
event EventHandler<SocketConnectionStateChangedEventArgs> ConnectionStateChanged;
/// <summary>
/// Method to send data over bluetooth socket
/// </summary>
/// <returns>The number of bytes written (zero indicates nothing was written).</returns>
/// <remarks>
/// The connection must be established.
/// </remarks>
/// <param name="data">The data to be sent.</param>
/// <since_tizen> 3 </since_tizen>
[Obsolete("Deprecated since API level 7. Please use SendData(byte[] data) method.")]
int SendData(string data);
/// <summary>
/// Method to send data over bluetooth socket
/// </summary>
/// <returns>The number of bytes written (zero indicates nothing was written).</returns>
/// <remarks>
/// The connection must be established.
/// </remarks>
/// <param name="data">The data to be sent.</param>
/// <since_tizen> 7 </since_tizen>
int SendData(byte[] data);
}
/// <summary>
/// The IBluetoothClientSocket interface handles the client socket operations.
/// </summary>
/// <since_tizen> 3 </since_tizen>
public interface IBluetoothClientSocket : IBluetoothServerSocket
{
/// <summary>
/// Connect client socket to server socket on remote device.
/// </summary>
/// <since_tizen> 3 </since_tizen>
void Connect();
/// <summary>
/// Disconnect client socket from server socket.
/// </summary>
/// <since_tizen> 3 </since_tizen>
void Disconnect();
}
internal class BluetoothSocket : IBluetoothClientSocket, IDisposable
{
private event EventHandler<SocketDataReceivedEventArgs> _dataReceived;
private event EventHandler<SocketConnectionStateChangedEventArgs> _connectionStateChanged;
private Interop.Bluetooth.DataReceivedCallback _dataReceivedCallback;
private Interop.Bluetooth.SocketConnectionStateChangedCallback _connectionStateChangedCallback;
private bool disposed = false;
internal int connectedSocket;
internal string remoteAddress;
internal string serviceUuid;
/// <summary>
/// This event occurs when the socket server receives data from the client.
/// </summary>
/// <exception cref="InvalidOperationException">Thrown when the Bluetooth is not enabled
/// or when the register data received callback fails.</exception>
public event EventHandler<SocketDataReceivedEventArgs> DataReceived
{
add
{
if (_dataReceived == null)
{
RegisterDataReceivedEvent();
}
_dataReceived += value;
}
remove
{
_dataReceived -= value;
if (_dataReceived == null)
{
UnregisterDataReceivedEvent();
}
}
}
/// <summary>
/// This event occurs when the connection state between two devices is changed.
/// </summary>
/// <exception cref="InvalidOperationException">Thrown when the Bluetooth is not enabled
/// or when the register connection changed callback fails.</exception>
public event EventHandler<SocketConnectionStateChangedEventArgs> ConnectionStateChanged
{
add
{
if (_connectionStateChanged == null)
{
RegisterConnectionStateChangedEvent();
}
_connectionStateChanged += value;
}
remove
{
_connectionStateChanged -= value;
if (_connectionStateChanged == null)
{
UnregisterConnectionStateChangedEvent();
}
}
}
private void RegisterDataReceivedEvent()
{
_dataReceivedCallback = (ref SocketDataStruct socketData, IntPtr userData) =>
{
Log.Info(Globals.LogTag, "DataReceivedCallback is called");
if (_dataReceived != null)
{
GCHandle handle2 = (GCHandle) userData;
_dataReceived(handle2.Target as IBluetoothServerSocket, new SocketDataReceivedEventArgs(BluetoothUtils.ConvertStructToSocketData(socketData)));
}
};
GCHandle handle1 = GCHandle.Alloc (this);
IntPtr uData = (IntPtr) handle1;
int ret = Interop.Bluetooth.SetDataReceivedCallback(_dataReceivedCallback, uData);
if (ret != (int)BluetoothError.None)
{
Log.Error(Globals.LogTag, "Failed to set data received callback, Error - " + (BluetoothError)ret);
BluetoothErrorFactory.ThrowBluetoothException(ret);
}
}
private void UnregisterDataReceivedEvent()
{
int ret = Interop.Bluetooth.UnsetDataReceivedCallback();
if (ret != (int)BluetoothError.None)
{
Log.Error(Globals.LogTag, "Failed to unset data received callback, Error - " + (BluetoothError)ret);
BluetoothErrorFactory.ThrowBluetoothException(ret);
}
}
private void RegisterConnectionStateChangedEvent()
{
_connectionStateChangedCallback = (int result, BluetoothSocketState connectionState, ref SocketConnectionStruct socketConnection, IntPtr userData) =>
{
Log.Info(Globals.LogTag, "ConnectionStateChangedCallback is called");
if (_connectionStateChanged != null)
{
connectedSocket = socketConnection.SocketFd;
GCHandle handle2 = (GCHandle) userData;
_connectionStateChanged(handle2.Target as IBluetoothServerSocket, new SocketConnectionStateChangedEventArgs((BluetoothError)result, connectionState, BluetoothUtils.ConvertStructToSocketConnection(socketConnection)));
}
};
GCHandle handle1 = GCHandle.Alloc(this);
IntPtr data = (IntPtr) handle1;
int ret = Interop.Bluetooth.SetConnectionStateChangedCallback(_connectionStateChangedCallback, data);
if (ret != (int)BluetoothError.None)
{
Log.Error(Globals.LogTag, "Failed to set connection state changed callback, Error - " + (BluetoothError)ret);
BluetoothErrorFactory.ThrowBluetoothException(ret);
}
}
private void UnregisterConnectionStateChangedEvent()
{
int ret = Interop.Bluetooth.UnsetSocketConnectionStateChangedCallback();
if (ret != (int)BluetoothError.None)
{
Log.Error(Globals.LogTag, "Failed to unset connection state changed callback, Error - " + (BluetoothError)ret);
BluetoothErrorFactory.ThrowBluetoothException(ret);
}
}
/// <summary>
/// Connects to a specific RFCOMM based service on a remote Bluetooth device UUID.
/// </summary>
/// <remarks>
/// The bluetooth must be enabled, discoverable with StartDiscovery(), and bonded with the remote device using CreateBond(). The ConnectionStateChanged event is raised once this API is called.
/// </remarks>
/// <exception cref="InvalidOperationException">Thrown when the Bluetooth is not enabled
/// or when the connect socket attempt to remote device fails, or when the service UUID is not supported by the remote device.</exception>
void IBluetoothClientSocket.Connect()
{
int ret = Interop.Bluetooth.ConnectSocket(remoteAddress, serviceUuid);
if (ret != (int)BluetoothError.None)
{
Log.Error(Globals.LogTag, "Failed to connect to socket, Error - " + (BluetoothError)ret);
BluetoothErrorFactory.ThrowBluetoothException(ret);
}
}
/// <summary>
/// Disconnects the RFCOMM connection with the given file descriptor of the conneted socket.
/// </summary>
/// <remarks>
/// The connection must be established.
/// </remarks>
/// <exception cref="InvalidOperationException">Thrown when the Bluetooth is not enabled
/// or when the socket disconnect to remote device fails.</exception>
void IBluetoothClientSocket.Disconnect()
{
int ret = Interop.Bluetooth.DisconnectSocket(connectedSocket);
if (ret != (int)BluetoothError.None)
{
Log.Error(Globals.LogTag, "Failed to disconnect socket, Error - " + (BluetoothError)ret);
BluetoothErrorFactory.ThrowBluetoothException(ret);
}
}
/// <summary>
/// Sends data to the connected device.
/// </summary>
/// <returns>The number of bytes written (zero indicates nothing was written).</returns>
/// <remarks>
/// The connection must be established.
/// </remarks>
/// <param name="data">The data to be sent.</param>
/// <exception cref="InvalidOperationException">Thrown when the Bluetooth is not enabled
/// or when the remote device is not connected, or the send data procedure fails.</exception>
[Obsolete("Deprecated since API level 7. Please use SendData(byte[] data) method.")]
public int SendData(string data)
{
int ret = Interop.Bluetooth.SendData(connectedSocket, data, data.Length);
if (ret < 0)
{
Log.Error(Globals.LogTag, "Failed to send data, Error - " + (BluetoothError)ret);
BluetoothErrorFactory.ThrowBluetoothException(ret);
}
return ret;
}
/// <summary>
/// Sends data to the connected device.
/// </summary>
/// <returns>The number of bytes written (zero indicates nothing was written).</returns>
/// <remarks>
/// The connection must be established.
/// </remarks>
/// <param name="data">The data to be sent.</param>
/// <exception cref="InvalidOperationException">Thrown when the Bluetooth is not enabled
/// or when the remote device is not connected, or the send data procedure fails.</exception>
public int SendData(byte[] data)
{
int ret = Interop.Bluetooth.SendData(connectedSocket, data, data.Length);
if (ret < 0)
{
Log.Error(Globals.LogTag, "Failed to send data, Error - " + (BluetoothError)ret);
BluetoothErrorFactory.ThrowBluetoothException(ret);
}
return ret;
}
~BluetoothSocket()
{
Dispose(false);
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
private void Dispose(bool disposing)
{
if (disposed)
return;
if (disposing)
{
// Free managed objects.
}
//Free unmanaged objects
RemoveRegisteredEvents();
disposed = true;
}
private void RemoveRegisteredEvents()
{
//unregister all remaining events when this object is released.
if (_dataReceived != null)
{
UnregisterDataReceivedEvent();
}
if (_connectionStateChanged != null)
{
UnregisterConnectionStateChangedEvent();
}
}
}
}