On Jan 2, 2007, at 4:05 PM, Thom McGrath wrote:
I'm trying to build a synchronous socket inside a thread which does
some lengthy file transfers and such. I do this to try to keep the
UI responsive throughout the process.
Everything is working well, but I am having a problem with keeping
track of the progress of transfers. If I simply keep track of
BytesLeftToSend, this simply isn't accurate because this becomes 0
long before the receiving end gets the last bytes. So is this
simply showing me the number of bytes left to copy into the
internal buffer? How can I track the number of bytes actually sent
to the other end without asking it for continuous feedback?
I don't think you can. Maybe you could with some declares. The trick
is that TCP will retransmit if it does not get an acknowledgment from
the other party. So your app could hand it's data to the socket and
then the socket sends it. However, you don't know it's been received
yet until the other side sends the acknowledgment back.
The benefit to this is that if this side sends it, it will keep
sending it until it gets an acknowledgment or it times out. So
ordinarily if the connection is made at all, it will all get to the
other side barring a network failure or some other catastrophic failure.
I think Aaron reads the forum and not the list, so if you want a more
definitive answer about what RBs sockets tell you, then you might
want to ask there.
Kevin
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