Re: change function

"Larry" <>
Sat, 30 Jan 2010 02:21:42 +0100
"Larry" <> ha scritto nel messaggio

this is what I have figure out so far: (untested)

#include <algorithm>

int Socket::ReceiveBytes(char * buffer, int buffersize)
 if(buffersize > 32768)
  buffersize = 32768;

 char temp[32768];

 u_long arg = 0;

 if (ioctlsocket(s_, FIONREAD, &arg) != 0)
  return -1;

 if (arg == 0)
  return 0;

 if (arg > buffersize)
  arg = buffersize;

 int rv = recv (s_, temp, arg, 0);

 if (rv <= 0)
  return -1;

 if (rv == 0)
  return 0;

 if (rv > 0)
  std::copy(temp, temp + rv, buffer);



Determine the amount of data which can be read atomically from socket s.
argp points to an unsigned long in which ioctlsocket stores the result. If s
is stream oriented (for example, type SOCK_STREAM), FIONREAD returns an
amount of data which can be read in a single recv; this may or may not be
the same as the total amount of data queued on the socket. If s is message
oriented (for example, type SOCK_DGRAM), FIONREAD returns the size of the
first datagram (message) queued on the socket.

So I basically I will recv according to ioctlsocket. if the latter is > then
buffersize I will read buffersize (arg = buffersize) if it's just happy with that...if it's 0 or less don't even bother
copying the buffer and return accordingly.

that's all

what about my idea?


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