getDoubleWithDefault
open fun getDoubleWithDefault(key: String, def: <Error class: unknown class>): <Error class: unknown class>
Returns the floating point number represented by the value that is associated with @key, or @default_val if the value does not represent a floating point number.
Floating point numbers are parsed with g_ascii_strtod().
Return
the floating point number associated with @key
Parameters
key
a key
def
the default value