Oleg:
Hello! Sounds very promising. I'm *very* much of
the mind that we should remove MFC classes in as many
places as possible. I'm glad this one showed so much of
a performance problem that it requires retro-fitting.
-Scott
PS: Will Igor be joining the Kaboodle-Devel list I hope?
On Thu, 29 Nov 2001, Oleg Lyapin wrote:
> 29 nov 2001 Status report
> -----------------------------
> We managed to establish the three-step connection:
>
> [VNC Viewer] - [Kaboodle] - [Kaboodle] - [VNC Server]
> \__________pc1__________/ \___pc2__/ \___pc3____/
>
> We temporarily moved the VNC Server (pc3) apart from Kaboodle (pc2) for
> debuging purposes. And the scheme really started breathing. On pc1, we
> observed fragments of the screen image of the remote machine pc3 and had the
> communication logs.
> There is one problem now, yet solvable (I believe). Everything works
> abnormally slow, we could not even manage to get the whole screen image.
> Analysis of the logs showed that the delays occur in the CAsyncSocket's
> callback function OnReceive(int nErrCode). After all the necessary
> connections have been established, the image transfer begins; we are getting
> real time log info. It often shows the following message coming from
> OnReceive: "A non-blocking socket operation could not be completed
> immediately". This only occurs at the Kaboodle when receiving from VNC
> Server.
> Here is the bottom line: we use an MFC socket class while VNS uses
> straight sockets (the source code is available and we found it out). Here
> are the four connection cases (I designated MFC socket as M and
> non-MFC socket as N):
>
> N - N: ok
> M - M: ok
> M - N: ok
> N - M: delays over 3 seconds.
>
> If the problem is really due to socket incompatibility then it could be
> solved by simply borrowing the socket implementation from the native VNC
> code (luckily we have the source). So we are busy trying it now.
>
> -Oleg
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