connect() [3/3]

void xtd::net::sockets::udp_client::connect	(	const xtd::string &	hostname,
		uint16	port
	)

Establishes a default remote host using the specified hostname and port number.

Parameters

hostname	the hostname to connect to.
port	The port number to which you intend send data

Exceptions

xtd::net::sockets::socket_exception	An error occurred when attempting to access the underlying socket.
xtd::object_closed_exception	The underlying xtd::net::sockets::socket has been closed.

Remarks

The xtd::net::sockets::udp_client::connect method establishes a default remote host using the values specified in the addr and port parameters. Once established, you do not have to specify a remote host in each call to the xtd::net::sockets::udp_client::send method.

Establishing a default remote host is optional. Specifying a default remote host limits you to that host only. If you want to send datagrams to a different remote host, you must make another call to the xtd::net::sockets::udp_client::connect method or create another xtd::net::sockets::udp_client without a default remote host. If you have established a default remote host and you also provide a remote host in your call to the xtd::net::sockets::udp_client::send method, xtd::net::sockets::udp_client::send will throw a xtd::net::sockets::socket_exception. If you receive a xtd::net::sockets::socket_exception, use xtd::net::sockets::socket_exception.ErrorCode to obtain the specific error code. Once you have obtained this code, you can refer to the Windows Sockets version 2 API error code documentation for a detailed description of the error.

If you call the xtd::net::sockets::udp_client::connect method, any datagrams that arrive from an address other than the specified default will be discarded. You cannot set the default remote host to a broadcast address using this method unless you inherit from xtd::net::sockets::udp_client, use the client method to obtain the underlying xtd::net::sockets::socket, and set the socket option to SocketOptionName.Broadcast.

You can however, broadcast data to the default broadcast address, 255.255.255.255, if you specify xtd::net::ip_address::broadcast in your call to the xtd::net::sockets::udp_client::send method. If your application requires greater control over broadcast addresses, you can also revert to using the xtd::net::sockets::socket class.

Note

Since the UDP protocol is connectionless, the xtd::net::sockets::udp_client::connect method does not block. Do not call the xtd::net::sockets::udp_client::connect method if you intend to receive multicasted datagrams.

If you receive a xtd::net::sockets::socket_exception, use the xtd::net::sockets::socket_exception::error_code property to obtain the specific error code. After you have obtained this code, refer to the Windows Sockets version 2 API error code documentation in the MSDN library for a detailed description of the error.