Hello, I'm writing a application in D2006 and build a communication dll for it. The communications dll encapsulates different communication methods (for USB, ethernet...). Ethernet communication is done via ICS TWSocket, the version included on the partner cd.
The DLL has a data module which has one single TWSocket for all incomming data and for each outgoing connection a TWSocket is created dynamically. The instance of this socket is stored in a TObjectList together with other relevant information. When the first connection is opened a seperate thread within the DLL is created for handling of the windows messages (needed by TWSocket and other components as well). This works so far until the point is reached where the DLL is freed. The DLL is used statically in another DLL which has a thread for each connection too. This 2nd dll is loaded dynamically. When it is freed via free library, its finalization checks if there are any open connections thus threads) left. If yes, they all get freed and by freeing them each connection in the first dll should get closed too. With TWSocket this doesn't work, because socket.close seems to hang and the 1st DLL never reaches the statement after the close. Pseudo code is like this: - write a marker to the windows eventlog (debug output) - call socket.close; - sleep(25); - write a marker to the windows eventlog (debug output) - call socket.free; The 2nd marker is never reached!!! In my test app. it's as follows: a connection is opened, data is send and when closing the form, freelibrary for the 2nd dll is called. It hangs the application for some time and a look in the eventlog reveals that the 2nd marker never gets written. If you try to close the app. again after halfe a minute itgets closed like nothing had hapened. If one does the same thing (same test app.) but uses a RS232 connection instead of the UPD one via TWSocket it works well when you close the app. What can this be? I think the bug was already in the dll back when I used D2005 for development, I don't think it's specific to the ICS version on the D2006 partner DVD. Greetings Markus Humm -- To unsubscribe or change your settings for TWSocket mailing list please goto http://www.elists.org/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
