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CHAPTER 6: External Communication Tools Socket object reference 198

listen()

socketObj.listen (port [, encoding]);

port

Number. The TCP/IP port number to listen on. Valid port numbers are 1 to 65535.

Typical values are 80 for a Web server, 23 for a Telnet server and so on.

encoding

Optional. String. The encoding to be used for the connection. Typical values are

“ASCII,” “binary,” or “UTF-8.” Default is “ASCII.”

Instructs the object to start listening for an incoming connection.

The call to

open() and the call to listen() are mutually exclusive. Call one function or the other,

not both.

Returns true on success.

open()

socketObj.open (host [, encoding]);

host

String. The name or IP address of the remote computer, followed by a colon and the

port number to connect to. The port number is required. Valid computer names are,

for example, “www.adobe.com:80” or “192.150.14.12:80”.

encoding

Optional. String. The encoding to be used for the connection. Typical values are

“ASCII,” “binary,” or “UTF-8.” Default is “ASCII.”

Opens the connection for subsequent read/write operations.

The call to

open() and the call to listen() are mutually exclusive. Call one function or the other,

not both.

Returns true on success.

poll()

socketObj.poll ();

Checks a listening object for a new incoming connection. If a connection request was detected, the

method returns a new

Socket object that wraps the new connection. Use this connection object to

communicate with the remote computer. After use, close the connection and delete the JavaScript

object. If no new connection request was detected, the method returns

null.

Returns a

Socket object or null.

read()

socketObj.read ([count]);

count

Optional. Number. The number of characters to read; default is 0. If negative, the call is

equivalent to

readln()

Reads up to the specified number of characters from the connection, waiting if necessary. Ignores

CR characters unless encoding

is set to BINARY.

Returns a string that contains up to the number of characters that were supposed to be read, or the

number of characters read before the connection closed or timed out.

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