Hi everybody,
i am using IDL 4.01 on an UltraSparc running Solaris 2.5.
Recently i created a WIDGET_SLIDER with a preset MIN of 0
and an undefined MAX (which defaults to 100). As i tried to
change the MAX-value with WIDGET_CONTROL,,/SET_SLIDER_MAX,
values LE 3 caused a segmentation fault.
The same error occurred with completely uninitialized
MIN/MAX values.
Only after i set the initial MAX value to 1, the segmentation
fault disappeared.
b = widget_base()
s = widget_slider(b, min=0, xsize=200, /suppress_value)
widget_control, b, /realize
print,5 & widget_control,s,set_slider_max=5
print,4 & widget_control,s,set_slider_max=4
print,3 & widget_control,s,set_slider_max=3
print,2 & widget_control,s,set_slider_max=2
print,1 & widget_control,s,set_slider_max=1
and the IDL output:
IDL> b = widget_base()
IDL> s = widget_slider(b, min=0, xsize=200, /suppress_value)
IDL> widget_control, b, /realize
IDL> print,5 & widget_control,s,set_slider_max=5
5
IDL> print,4 & widget_control,s,set_slider_max=4
4
IDL> print,3 & widget_control,s,set_slider_max=3
3
% Program caused arithmetic error: Floating illegal operand
% Detected at $MAIN$
Segmentation Fault
If you use the following:
b = widget_base()
s = widget_slider(b, min=0, max=1, xsize=200, /suppress_value)
widget_control, b, /realize
print,5 & widget_control,s,set_slider_max=5
print,4 & widget_control,s,set_slider_max=4
print,3 & widget_control,s,set_slider_max=3
print,2 & widget_control,s,set_slider_max=2
print,1 & widget_control,s,set_slider_max=1
you will get the expected result:
IDL> b = widget_base()
IDL> s = widget_slider(b, min=0, max=1, xsize=200, /suppress_value)
IDL> widget_control, b, /realize
IDL> print,5 & widget_control,s,set_slider_max=5
5
IDL> print,4 & widget_control,s,set_slider_max=4
4
IDL> print,3 & widget_control,s,set_slider_max=3
3
IDL> print,2 & widget_control,s,set_slider_max=2
2
IDL> print,1 & widget_control,s,set_slider_max=1
1
IDL>
Did anybody else came across this error and/or knows a reason
for this behavior?
----
H.-M. v.Stockhausen
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