Hi, I want to write a program that plays a sound when a computer, specified by it's ip address, comes online/is turned on. It would be great if I wouldn't have to write a client for the observed computer. I just want to know if there is someone at the end of the line at 188.8.131.525(just an example and a fake ip address of course). I could use functionality similar to the MS-Dos ping command, but my friend Google already told me that Java doesn't support such a low-level protocol as used for the ping requests. Do you know any solution where the observed computer doesn't have to have something in it's autostart that listens on a port just for such higher-level ping requests? Thanks in advance
Hello. What about trying to connect to a port of the host? If the result is "java.net.ConnectException: Connection refused: no further information" that means the computer is reachable though there is no process listening at that port. You might use the connect method that is able to throw a SocketTimeoutException.