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>I am acquiring data
>from a USB device using the standard Windows call
>WinApi.DeviceIoControl. This call appears to be blocking,
>i.e., it does not return unless the device sends the
>requested data. In case the device does not have data,
>the call stalls, and as a consequence BlackBox becomes
>unresponsive (an hour glass appears on screen).
Couldn't you simply use Blackbox's "Services.Action"
routines to prevent the Blackbox framework from
being unresponsive?
Although I'll always second any suggestion to improve
the multi-threading capabilities of Blackbox -- I've been
suggesting this since 1996! In my case, I have a long
running command which calls a Fortran DLL which in
turns calls my Blackbox code. Unfortunately, whenever
the Fortran DLL is being executed, the Blackbox
framework becomes unresponsive and I can no longer
do anything in it until the Fortran DLL is finished.
And there doesn't appear to be any way to use the
"Services.Action" routines to fix this. I also once
tried using Windows process threads to try to workaround
this, but this caused the Blackbox framework to crash.
Marc Martin
marc.martin{([at]})nowhere.xy
Boeing Commercial Space Company
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Received on Thu Feb 20 2003 - 02:25:26 UTC