Hello Wilfried, Well now I know the problem. The Overbyte web site says RcvdCount is unreliable. Their example shows the use of a 8192 size buffer in Data Available to receive whatever data may be there and to check the return of the Receive() call to know how much data was delivered. I assume this means that the maximum amount of data received during any Data Available event is 8192.
It's amazing how so small a thing can cost you so much time. I'm going to recode and retest now. Thanks, Robert --- On Fri, 6/5/09, robertoschler <robertosch...@yahoo.com> wrote: > From: robertoschler <robertosch...@yahoo.com> > Subject: Re: [twsocket] TWSocket stops receiving where TClientSocket just > keeps going > To: "ICS support mailing" <twsocket@elists.org> > Date: Friday, June 5, 2009, 8:10 PM > > Hello again Wilfried, > > A little extra data. My Data Available event handler > grabs the number of waiting bytes in the queue from the > RcvdCount property (I use it to size the receive > buffer). If the byte count is 0, I just ignore the > Data Available event. That is, I do nothing. I > just added code to the Data Available event handler to add a > line to my session log whenever I get a Data Available event > where the RcvdCount is 0. I'm getting a ton of Data > Available events where the RcvdCount is 0 on the plain > vanilla TWSocket instance connected to the image streaming > server. Any ideas what could cause that to happen? > > Thanks, > Robert > > --- On Fri, 6/5/09, robertoschler <robertosch...@yahoo.com> > wrote: > > > From: robertoschler <robertosch...@yahoo.com> > > Subject: Re: [twsocket] TWSocket stops receiving where > TClientSocket just keeps going > > To: "ICS support mailing" <twsocket@elists.org> > > Date: Friday, June 5, 2009, 7:43 PM > > > > Hello Wilfried, > > > > Thank you for your reply. > > > > It appears to be something with my application but I > don't > > know what. I grabbed your SocketSpy program and set > it > > up to act as a proxy between the streaming image > server and > > my program. Your log kept accumulating incoming > data > > from the server while my app, which was connected to > > SocketSpy as an incoming client, stopped firing > > DataAvailable() events after a certain number of > received > > frames, just as I described before. > > > > Now some details. My app is also a proxy server > like > > SocketSpy. I looked at the SocketSpy code and here > is > > the only crucial difference I could find between your > code > > and mine. When your server socket accepts a > connection > > you create a client socket that creates it's own > REMOTE > > client socket when a new connection is accepted. > This > > REMOTE client socket immediately connects to the other > end > > other end of the proxy link. From the client > socket's > > Data Available handler you immediately send the data > to the > > REMOTE socket and vice-a-versa. > > > > In my program when I accept a new connection with > > TWSocketServer I just create a client socket. This > > results in a message being posted to the host form > telling > > it a new client has been connected and the current > > connection count. If the client count is now > greater > > than 0 for the first time, a single plain vanilla > TWSocket > > control then connects to the streaming image server > > completing the other end of my proxy link. (Details > on > > why I use this architecture are below). > > > > To facilitate data transfer I use windows messages > posted > > to the host form. When *any* of the Clients to > > TWSocketServer fire the Data Available event, I post > a > > message to the host form notifying it of the new > data. > > The host form then calls SendStr() on the single > plain > > vanilla TWSocket control connected to the image > streaming > > server. Conversely, when the plain vanilla TWSocket > > control fires its Data Available event, a message is > posted > > to the host form who then sends the data to ALL > clients > > connected to the TWSocketServer instance. > > > > I do this so I can have a one-to-many proxy link, > where > > multiple clients can receive the image stream from the > image > > server. Also, I use the windows messaging technique > > for safety purposes so that I am not trying to send > large > > amounts of data to the other end of the proxy link > from > > within the Data Available handler itself. By using > > windows messages to trigger the sends I am moving the > send > > outside the scope of the Data Available handler. > > > > Note, I have code in *every* event handler for all > sockets, > > including for the Error and BgException events, and I > am not > > getting any error reports. I also check all > > ErrorCode's on those events that provided that > parameter, > > and report any non zero code ErrorCode occurrences. > > There have been no such occurrences. > > > > Do you have any ideas for tests or tips on trying to > > diagnose why the Data Available event on the plain > vanilla > > TWSocket component connected to the image streaming > server > > would go dead after receiving successfully for a > short > > time? > > > > Thanks for your help, > > Robert > > > > > > --- On Fri, 6/5/09, Wilfried Mestdagh <wilfr...@mestdagh.biz> > > wrote: > > > > > From: Wilfried Mestdagh <wilfr...@mestdagh.biz> > > > Subject: Re: [twsocket] TWSocket stops receiving > where > > TClientSocket just keeps going > > > To: "ICS support mailing" <twsocket@elists.org> > > > Date: Friday, June 5, 2009, 3:30 AM > > > Hello Robert, > > > > > > To be absolutely sure if it is the sending or > > receiving > > > application I > > > suggest you put SocketSpy between it. You find it > on > > user > > > made page. > > > Then we are sure in wich application is a bug and > we > > can > > > search deeper. > > > > > > --- > > > Rgds, Wilfried [TeamICS] > > > http://www.overbyte.be/eng/overbyte/teamics.html > > > http://www.mestdagh.biz > > > > > > Thursday, June 4, 2009, 17:58, robertoschler > wrote: > > > > > > > > > > I have an application that opens an > outgoing > > > connection to an MJPEG > > > > streaming server (server push using MIME > > multi-part > > > boundary method). > > > > With my TWSocket code, I connect fine and > then I > > get > > > an arbitrary > > > > number of frames until the connection > appears to > > stop > > > receiving data, > > > > permanently. The data available event > never > > > fires again until I close > > > > the connection and reconnect. This > happens > > > pretty quick. Sometimes > > > > it's a small number of frames (e.g. - 1 to > 7). > > > Other times I get a > > > > nice chunk of about 30 to 50 frames, but > always > > the > > > data reception > > > > just dries up. > > > > > > > To make sure the server was not stopping > > transmission, > > > I coded up a > > > > simple example using the included Delphi 6 > > > TClientSocket component. I > > > > set it to non-blocking mode which is how I > use > > > TWSocket too. It did > > > > not exhibit the problem. It kept > receiving > > > frames until I shut down > > > > the connection. > > > > > > > How can I diagnose and or fix the problem > with > > my > > > TWSocket code? I would prefer to use that > instead. > > > > > > > Note: I am using Delphi 6 Pro and ICS > version 5. > > > > > > > Thanks, > > > > Robert > > > > > > > > > > > > > -- > > > > To unsubscribe or change your settings for > > TWSocket > > > mailing list > > > > please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket > > > > Visit our website at http://www.overbyte.be > > > > > > -- > > > To unsubscribe or change your settings for > TWSocket > > mailing > > > list > > > please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket > > > Visit our website at http://www.overbyte.be > > > > > > > > > > > -- > > To unsubscribe or change your settings for TWSocket > mailing > > list > > please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket > > Visit our website at http://www.overbyte.be > > > > > > -- > To unsubscribe or change your settings for TWSocket mailing > list > please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket > Visit our website at http://www.overbyte.be > -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
