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Socket Buffer length

Posted on 1998-07-08
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Last Modified: 2013-11-19
Is there any way to tell the length of the in-Buffer for a socket without disturbing the data in the buffer?
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Question by:andy79
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by:andy79
ID: 1318874
Edited text of question
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piano_boxer earned 50 total points
ID: 1318875
You can get the number of bytes pending in the sockets inputbuffer by calling CAsyncSocket::IOCtl():

"FIONREAD Determine the maximum number of bytes that can be read with one Receive call from this socket. The lpArgument parameter points at a DWORD in which IOCtl stores the result. If this socket is of type SOCK_STREAM, FIONREAD returns the total amount of data which can be read in a single Receive; this is normally the same as the total amount of data queued on the socket. If this socket is of type SOCK_DGRAM, FIONREAD returns the size of the first datagram queued on the socket".

CSomeSocket sock;

DWORD dwBytesAvail = 0;
sock.IOCtl(FIONREAD, &dwBytesAvail);
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Author Comment

by:andy79
ID: 1318876
I mean, the number of bytes in the buffer that are ready to be read.
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Expert Comment

by:piano_boxer
ID: 1318877
Thats it!
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