BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  TCustomWinSocket          BorlandTalk.com Forum Index -> C++ Builder (Native API) View previous topic :: View next topic   Author Message Robert G. Hoover Guest Posted: Fri Oct 28, 2005 6:44 pm    Post subject: TCustomWinSocket Hello All, I've got a weird symptom that I really need some advice on... I'm developing a live video socket-based application. I've got an impressive framerate with a 1 megapixel color image. But, I see a 2 second lag in my video feed across a 100MPS LAN connection. I've traced this lag to "whatever happens after TCustomWinSocket::SendBuf()". I tried to call Application->ProcessMessages() to force windows to process the sending event immediately, but it had no effect. My assumption is that the SendBuf command posts the event message to Windows and Windows doesn't get around to actually sending bytes across the LAN cable for 2 seconds. Is there a way to kick Windows in the pants to process my event immediately? Or is this a typical Windows overhead issue? I'm hoping for the former... :( Thanks so much! Rob Back to top Remy Lebeau (TeamB) Guest Posted: Fri Oct 28, 2005 8:39 pm    Post subject: Re: TCustomWinSocket "Robert G. Hoover" <not.a.real.address (AT) anywhere (DOT) sorry> wrote Quote: I've traced this lag to "whatever happens after TCustomWinSocket::SendBuf()". SendBuf() calls the winsock API send() function. By default, a socket will buffer outgoing data and not send it immediately. This allows the socket to send efficient packets. This is known as "send coalescing", also known as the Nagle algorithm. Have a look at the socket API setsockopt() function for details on the TCP_NODELAY option. Quote: I tried to call Application->ProcessMessages() to force windows to process the sending event immediately, but it had no effect. My assumption is that the SendBuf command posts the event message to Windows Your assumptions is not correct. Socket writes do not use window messages at all. Calling ProcessMessages() has no effect on an outgoing socket transmission, other than to slow down the code that surrounds the writing. Quote: Windows doesn't get around to actually sending bytes across the LAN cable for 2 seconds. That is a very likely possibility. Quote: Is there a way to kick Windows in the pants to process my event immediately? See above. Gambit Back to top Robert G. Hoover Guest Posted: Tue Nov 01, 2005 2:39 pm    Post subject: Re: TCustomWinSocket Thanks for the tip... I've been looking through the documentation for TWinServerSocket and I'm not seeing anything similar to the SOCKET parameter that setsockopt() accepts. Is the SocketHandle the same thing, and int address of the SOCKET structure? Is there a way to translate the TWinServerSocket into a SOCKET struct? Thanks! Rob Remy Lebeau (TeamB) wrote: SendBuf() calls the winsock API send() function. By default, a socket will buffer outgoing data and not send it immediately. This allows the socket to send efficient packets. This is known as "send coalescing", also known as the Nagle algorithm. Have a look at the socket API setsockopt() function for details on the TCP_NODELAY option. Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Tue Nov 01, 2005 5:26 pm    Post subject: Re: TCustomWinSocket "Robert G. Hoover" <not.a.real.address (AT) anywhere (DOT) sorry> wrote Quote: I've been looking through the documentation for TWinServerSocket and I'm not seeing anything similar to the SOCKET parameter that setsockopt() accepts. Yes, you have. Quote: Is the SocketHandle the same thing, and int address of the SOCKET structure? Yes. As per Borland's doc: "Use SocketHandle for Windows socket API calls that require the handle to the socket." Quote: Is there a way to translate the TWinServerSocket into a SOCKET struct? Simply cast the SocketHandle to a SOCKET. Gambit Back to top Robert G. Hoover Guest Posted: Tue Nov 01, 2005 5:40 pm    Post subject: Re: TCustomWinSocket Thanks for clarifying... I saw "descriptor" as the SOCKET constructor return and didn't realize it was the same thing as the int SocketHandle. I had hoped that it was a simple typecast, as you later verified. Thanks again! Rob Remy Lebeau (TeamB) wrote: Quote: "Robert G. Hoover" <not.a.real.address (AT) anywhere (DOT) sorry> wrote in message news:43677e1a (AT) newsgroups (DOT) borland.com... I've been looking through the documentation for TWinServerSocket and I'm not seeing anything similar to the SOCKET parameter that setsockopt() accepts. Yes, you have. Is the SocketHandle the same thing, and int address of the SOCKET structure? Yes. As per Borland's doc: "Use SocketHandle for Windows socket API calls that require the handle to the socket." Is there a way to translate the TWinServerSocket into a SOCKET struct? Simply cast the SocketHandle to a SOCKET. 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