> Why do you use the ClientToScreen-function at all?
The mouse coordinates passed with the WM_MOUSEMOVE message are relative to
the client area of the receiving window. The WindowFromPoint function needs
screen coordinates.
When VEE is maximized, there isn't much difference between them - the client
area starts just below the menu bar in the Y direction and at the left side
of the screen in the X direction (which, since it's maximized, doesn't have
a frame. Otherwise it's just after the frame).
> Windows operating system is deep an wide.
Deep doo-doo I thought at first. Lately it's gotten a lot better. The first
time I looked at Programming Windows I thought, "I will *NEVER* be able to
understand all this stuff." Fortunately I was wrong
-SHAWN-
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The mouse coordinates passed with the WM_MOUSEMOVE message are relative to
the client area of the receiving window. The WindowFromPoint function needs
screen coordinates.
When VEE is maximized, there isn't much difference between them - the client
area starts just below the menu bar in the Y direction and at the left side
of the screen in the X direction (which, since it's maximized, doesn't have
a frame. Otherwise it's just after the frame).
> Windows operating system is deep an wide.
Deep doo-doo I thought at first. Lately it's gotten a lot better. The first
time I looked at Programming Windows I thought, "I will *NEVER* be able to
understand all this stuff." Fortunately I was wrong
-SHAWN-
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I don't remember exactly what is the throughput. However we made test and we have detected that (at least old Agilent) gateway was slower (one magnitude order) than a Agilent GPIB card. Gateway is very good for including a small device far from you want to manage data. However, if you need very speed, probably you need a PCI GPIB card into a PC. Here you can cut, paste, store and manage data. After that you could send data to the remote computer through the LAN.
I can say that we use Agilent gateway in order to get trace from a Spectrum Analyser without problems. We select Agilent because it is very easy to integrate by using SICL libraries.
Regards,
> -----Mensaje original-----
> De: Stan Bischof [mailto:rsb@soco.agilent.com]
> Enviado el: martes, 02 de diciembre de 2003 18:08
> Para: VRF
> CC: vrf@agilent.com
> Asunto: [vrf] Re: GPIB Lan Gateway
>
>
> > I am evaluating the GPIB LAN Gateway products from Agilent
> and NI. The project is a remote Telemetry System that needs
> to return spectrum analyzer and oscilloscope displays. I
> have a dedicated Ethernet for this project. Which product in
> anyone's experience provides the fastest throughput? I am
> interested in providing the best update rates I can across a
> 10 meg Ethernet. I have a P4-2.4GHz running XP Pro. I also
> have some NI 8212 PCI GPIB controller with Ethernet. Is it
> possible to use this product for the gateway?
>
>
> No idea about the 8212, but the question of thruput is
> the important one. Unfornutanely it can't be directly answered
> since the gateway itself is unlikely to bethe bottleneck. This
> will depend highly upon what instrument you are using
> and what sort of data.
>
> Most any SA or scope will be slower than GPIB speeds so
> quite likely measurement speed will be your slowest point.
> If you are sending lots of small chunks of data that 10 meg
> ethernet could easily be the bottleneck. Or if you have large
> chunks sent quickly the GPIB link could be slowest. Or conceivably
> the gateway- but it is about last in line.
>
>
> I'd suggest a few simple experiments to see which is slowest
> section for your work. Like stat by hooking the SA direct
> to a plugin card (will be faster than any network solution)
> and see what performance you get.
>
> A dedicated LAN segment driving a gateway is great for most
> applications.
>
> Since you mention remot telemtry, have you considered a wireless
> link? That should be great with the gateways also.
>
> Stan
>
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