On Sat, 4 Sep 2010, raje...@cse.iitm.ac.in wrote:
Hi,
I have the following piece of code,
repeat{
ss-read.socket(sockfd);
if(ss==) break
output-paste(output,ss)
}
but somehow, output is not receiving all the data that is coming through the
socket.My suspicion is on the if statement. what happens if a white space
occurs in between the string arriving over the socket?
That's not the problem. The problem occurs when R reads faster than the data
are provided -- R will read and there will not be any new data available, so ss
will be the empty string and the program will end.
In general you can't rely on the sender transmitting data fast enough to keep
ahead of R. The example in make.socket() is reading a very small amount of
data, so it worked reasonably well back in the days when the finger daemon was
more widely active. You need some more precise way of knowing when the data
stream is over. This could be some sort of 'end of transmission' marker or a
count of the number of bytes or lines to be expected.
-thomas
Thomas Lumley
Professor of Biostatistics
University of Washington, Seattle
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