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Re: timers without widgets [message #43551]

Fri, 22 April 2005 09:38

Rick Towler
Messages: 821
Registered: August 1998

Senior Member

Hi Benjamin,

> does anyone know if it is possible to have timed events without using
> widgets?

I don't think it is... There is no way to register callback in IDL
except within the widget system. I should say I'm on pretty shaky
ground since I haven't looked at this in a long time but I wanted to
implement a simple callback in a dlm and the only way I could figure out
how to do it was by using WIDGET_STUB to send events to IDL's widget
event system.

I understand that 95% of events are generated by a GUI but it would be
nice to have some sort of mechanism to handle the other 5%. Timers and
socket I/O come to mind.

-Rick

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Re: timers without widgets [message #43733 is a reply to message #43551]

Fri, 22 April 2005 15:37

Benjamin Hornberger is currently offline

Benjamin Hornberger
Messages: 258
Registered: March 2004

Senior Member

Rick Towler wrote:
>
> I understand that 95% of events are generated by a GUI but it would be
> nice to have some sort of mechanism to handle the other 5%. Timers and
> socket I/O come to mind.

Socket I/O is exactly our problem. We use a timer to continuously
(actually frequently rather than continuously) read from a socket to
implement a listening socket. But there are many problems with that,
like IDL not reacting while it tries to read (looks like crashed).

I guess IDL is just made for data analysis and not instrument control
which involves interaction with device drivers and the OS on a deeper
level :-(.

Benjamin

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