Re: SetSockOpt with SO_REUSEADDR parameter
- From: Joseph M. Newcomer <newcomer@xxxxxxxxxxxx>
- Date: Fri, 23 Mar 2007 01:00:31 -0500
While UDP is probably the correct choice, his error is that he is using a TCP article to
build his server, and missing most of the key points of how TCP and UDP differ.
joe
On Thu, 22 Mar 2007 05:36:28 -0500, "Mubashir Khan" <mubi@xxxxxxxxx> wrote:
Yes udp is the correct option for this scenerio ..... for both realtimeJoseph M. Newcomer [MVP]
audio and video. We once worried about the data reliability and we used tcp
for VOIP communication in one of our systems .... the voice data was too
much and too rapid for the tcp buffer at target pc and we were having all
sorts of problems. Later on we switched to UDP. In heavy traffic time, few
packets will be missed and voice at the other end may cut for few moments,
in telephony language we called it distortion in line... other wise every
thing went fine ....
interesting article
http://msdn2.microsoft.com/en-us/library/ms740621.aspx
It says you may be using Bind after setting socket option.
"mmlab_js" <mmlabjs@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:0F1E014C-41F4-4498-B008-CA1E951B610D@xxxxxxxxxxxxxxxx
********
This concept does not exist. So whatever you are trying to do, it won't
work. There is
no concept that allows you to create multipe sockets with the same port
number. What is
happening is that you are throwing away the old socket and replacing it
with the new
socket.
I write a server application to send real-time video frame to client(s).
When a client logins into server, I will create a UDP socket to send
real-time video frame to it.
So, I think I will use multiple sockets with the same port to send frame.
Is this concept wrong?
****
NEVER, EVER, UNDER ANY CIRCUMSTANCES IMAGINABLE, EVER WRITE SOMETHING LIKE*****
THIS!
THIS IS ALWAYS AN ERROR!!!
It make no sense at all to compare a boolean value to TRUE or FALSE; it is
as pointless as writing
if( (a > 0) == TRUE)
instead of writing
if(a > 0)
since a boolean value always stands for, well, a boolean value. Comparing
a boolean value
to TRUE is ALWAYS an error, since ANY non-zero value is non-FALSE, but you
have
erroneously insisted that it be equal to the literal TRUE!
LOSE THIS BAD PROGRAMMING STYLE IMMEDIATELY!!!!
Thanks for your suggestions. I will remember and change my bad programming
style.
I'm not sure what you are doing here or why you are needing to reuse theThe reason I use mutiple UDP is the beginning of this response.
address for
multiple connections, because UDP is a connectionless protocol.
Because I will send real-time video frame, I use UDP socket.
I will re-describe my idea. The basic architecture is based on the source
[http://support.microsoft.com/kb/192570]
1) Server listen on port 9898
2) Client spawns a thread, which connects to the server
3) Server accepts the connection and spawns a thread to handle the socket
communication and send real-time frame
4) The thread creates a UDP socket with port 9899
5) The thread sends the real-time frame with UDP socket to client.
So, I think I need one UDP socket for one client.
After I change the following code:
==============================================================
void CUdpSendSocket::CreateSocket(UINT nPort)
{
CString szError;
BOOL bRet = Create(nPort, SOCK_DGRAM, FD_WRITE);
if (bRet > 0) {
szError.Format(_T("Send Socket Create() failed: %d"),
::GetLastError());
AfxMessageBox(szError);
return;
}
m_nPortNum = nPort;
BOOL reuse = TRUE;
if (!SetSockOpt(SO_REUSEADDR ,&reuse, sizeof(int))) {
szError.Format(_T("SetSockOpt failed to set SO_REUSEADDR:%d"),
::GetLastError());
AfxMessageBox (szError);
}
}
==============================================================
It still can't work for create UDP sockets with the same port. What shall
I
do?
email: newcomer@xxxxxxxxxxxx
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm
.
- References:
- Re: SetSockOpt with SO_REUSEADDR parameter
- From: Joseph M . Newcomer
- Re: SetSockOpt with SO_REUSEADDR parameter
- From: mmlab_js
- Re: SetSockOpt with SO_REUSEADDR parameter
- From: Mubashir Khan
- Re: SetSockOpt with SO_REUSEADDR parameter
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