Socket.getAvailableBytes

Get the amount of data pending in the OS input buffer, without blocking.

If socket is a UDP or SCTP socket, this will return the size of just the next packet, even if additional packets are buffered after that one.

Note that on Windows, this function is rather inefficient in the UDP case, and so if you know any plausible upper bound on the size of the incoming packet, it is better to just do a Socket.receive with a buffer of that size, rather than calling Socket.getAvailableBytes first and then doing a receive of exactly the right size.

class Socket
ptrdiff_t
getAvailableBytes
()

Return Value

Type: ptrdiff_t

the number of bytes that can be read from the socket without blocking or truncating, or -1 on error.

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Since

2.32