I did some test.
This code will cause indicator invisible
IndicatorSetDouble(INDICATOR_MAXIMUM, 0.0);
IndicatorSetDouble(INDICATOR_MINIMUM, 0.0);
And this code will cause MT5 (build 249) crash!
IndicatorSetDouble(INDICATOR_MAXIMUM, EMPTY_VALUE);
IndicatorSetDouble(INDICATOR_MINIMUM, EMPTY_VALUE);
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Why there are not IndicatorGetXXX function?
How to get MAXIMUM or MINIMUM of a indicator?
If I set MAXIMUM or MINIMUM of a indicator, how to clear them at runtime?
If I set some levels of a indicator, how to delete these levels at runtime?