/// <summary>
/// Connect to a VNC Host and determine which type of Authentication it uses. If the host uses Password Authentication, a call to Authenticate() will be required.
/// </summary>
/// <param name="host">The IP Address or Host Name of the VNC Host.</param>
/// <param name="display">The Display number (used on Unix hosts).</param>
/// <param name="port">The Port number used by the Host, usually 5900.</param>
/// <param name="viewOnly">True if mouse/keyboard events are to be ignored.</param>
/// <returns>Returns True if the VNC Host requires a Password to be sent after Connect() is called, otherwise False.</returns>
public async Task <bool> ConnectAsync(string host, int display, int port, bool viewOnly, CancellationToken ct = default)
{
if (host == null)
{
throw new ArgumentNullException(nameof(host));
}
// If a diplay number is specified (used to connect to Unix servers)
// it must be 0 or greater. This gets added to the default port number
// in order to determine where the server will be listening for connections.
if (display < 0)
{
throw new ArgumentOutOfRangeException(nameof(display), display, "Display number must be non-negative.");
}
port += display;
this.CreateRfbProtocol(viewOnly);
// Connect and determine version of server, and set client protocol version to match
try
{
await rfb.ConnectAsync(host, port, ct).ConfigureAwait(false);
return(await this.ContinueConnectAsync(ct).ConfigureAwait(false));
} catch (Exception e) {
throw new VncProtocolException("Unable to connect to the server. Error was: " + e.Message, e);
}
}