/// <summary>
/// GetData is just a wrapper for BeginReceive.
/// This is the public entry point for asking for data.
/// Necessary so that we can separate networking concerns from client concerns.
/// </summary>
/// <param name="state"></param>
public static void GetData(SocketState state)
{
state.theSocket.BeginReceive(state.messageBuffer, 0, state.messageBuffer.Length,
SocketFlags.None, ReceiveCallback, state);
}
/// <summary>
/// Start attempting to connect to the server
/// </summary>
/// <param name="host_name"> server to connect to </param>
/// <returns></returns>
public static SocketState ConnectToServer(Action <SocketState> connecEst, string hostName)
{
SocketState theServer;
System.Diagnostics.Debug.WriteLine("connecting to " + hostName);
// Connect to a remote device.
try
{
// Establish the remote endpoint for the socket.
IPHostEntry ipHostInfo;
IPAddress ipAddress = IPAddress.None;
// Determine if the server address is a URL or an IP
try
{
ipHostInfo = Dns.GetHostEntry(hostName);
bool foundIPV4 = false;
foreach (IPAddress addr in ipHostInfo.AddressList)
{
if (addr.AddressFamily != AddressFamily.InterNetworkV6)
{
foundIPV4 = true;
ipAddress = addr;
break;
}
}
// Didn't find any IPV4 addresses
if (!foundIPV4)
{
SocketState d = new SocketState(null, -1);
System.Diagnostics.Debug.WriteLine("Invalid addres: " + hostName);
return(d);
}
}
catch (Exception e1)
{
// see if host name is actually an ipaddress, i.e., 155.99.123.456
System.Diagnostics.Debug.WriteLine("using IP");
ipAddress = IPAddress.Parse(hostName);
}
// Create a TCP/IP socket.
Socket socket = new Socket(ipAddress.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
socket.SetSocketOption(SocketOptionLevel.IPv6, SocketOptionName.IPv6Only, false);
theServer = new SocketState(socket, 0);
//Save CallBack Delegate for connection established..
theServer.callBack = connecEst;
theServer.theSocket.BeginConnect(ipAddress, DEFAULT_PORT, ConnectedToServer, theServer);
// theServer.theSocket.Close();
return(theServer);
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine("Unable to connect to server. Error occured: " + e);
return(null);
}
}
/// <summary>
/// Start receiving more data from the socket
/// </summary>
/// <param name="ss">The socketstate to receive data from</param>
public static void GetData(SocketState ss)
{
// Starts the event loop again to receive data
ss.theSocket.BeginReceive(ss.messageBuffer, 0, ss.messageBuffer.Length, SocketFlags.None, Networking.ReceiveCallback, ss);
}
/// <summary>
/// This function (along with its helper 'SendCallback') will allow a program to send data over a socket.
/// This function needs to convert the data into bytes and then send them using socket.BeginSend.
/// </summary>
/// <param name="socket"></param>
/// <param name="data"></param>
public static void Send(SocketState ss, String data)
{
byte[] messageBytes = Encoding.UTF8.GetBytes(data + "\n");
ss.theSocket.BeginSend(messageBytes, 0, messageBytes.Length, SocketFlags.None, SendCallback, ss);
}
/// <summary>
/// Connects to a server at the given address and then performs the Action
/// </summary>
/// <param name="Action">Action to be performed hen connection occurs</param>
/// <param name="Address">IP address of the desired server</param>
/// <returns>The SocketState that is created by the connection</returns>
public static SocketState ConnectToServer(SocketState.Callback Action, String Address)
{
System.Diagnostics.Debug.WriteLine("connecting to " + Address);
SocketState resultSocket;
// Connect to a remote device.
try
{
// Establish the remote endpoint for the socket.
IPHostEntry ipHostInfo;
IPAddress ipAddress = IPAddress.None;
// Determine if the server address is a URL or an IP
try
{
ipHostInfo = Dns.GetHostEntry(Address);
bool foundIPV4 = false;
foreach (IPAddress addr in ipHostInfo.AddressList)
{
if (addr.AddressFamily != AddressFamily.InterNetworkV6)
{
foundIPV4 = true;
ipAddress = addr;
break;
}
}
// Didn't find any IPV4 addresses
if (!foundIPV4)
{
System.Diagnostics.Debug.WriteLine("Invalid address: " + Address);
return(null);
}
}
catch (Exception e1)
{
// see if host name is actually an ipaddress, i.e., 155.99.123.456
System.Diagnostics.Debug.WriteLine("using IP");
ipAddress = IPAddress.Parse(Address);
}
// Create a TCP/IP socket.
Socket socket = new Socket(ipAddress.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
// set some options
socket.SetSocketOption(SocketOptionLevel.IPv6, SocketOptionName.IPv6Only, false);
// creates the SocketState
resultSocket = new SocketState(socket, -1);
// Sets the Callback function
resultSocket.CallMe = Action;
// Begins event loop
resultSocket.theSocket.BeginConnect(ipAddress, Networking.DEFAULT_PORT, ConnectedCallback, resultSocket);
}
// catches when stuff breaks
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine("Unable to connect to server. Error occured: " + e);
throw e;
}
// return the socketstate
return(resultSocket);
}
