Fun Way to Catch All Vid Rebol Errors
I stumbled upon this and just wanted to make sure it wasn't a glitch in Rebol's design. I have the following code that seems to successfully catch all program errors in the VID environment.
view layout [
across
label "Rebol Command:"
f: field [
do f/text
focus f
] return
button "Error 1" [
print this-is-an-error-1
]
button "Error 2" [
print this-is-error-2
]
time-sensor: sensor 0x0 rate 1000
feel [
engage: func [face action event] [
if action = 'time [
time-sensor/rate: none
show face
if error? err: try [
do-events
true ; to make the try happy
][
the-error: disarm :err
? the-error
; reset sensor to fire again
time-sensor/rate: 1000
show face
focus f
]
]
]
]
do [
focus f
]
]
+3
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1 answer
This is not a glitch - it do-events
really is a dispatcher that will run until an error occurs. I would suggest decoupling the error handler from the layout model itself, though:
view/new layout [
across
label "Rebol Command:"
f: field [
do f/text
focus f
] return
button "Error 1" [
print this-is-an-error-1
]
button "Error 2" [
print this-is-error-2
]
do [
focus f
]
]
forever [
either error? err: try [
do-events
][
the-error: disarm :err
? the-error
focus f
][
break
]
]
+3
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