* R0 = Window handle
R1 = Icon handle
R2 = Base if ³ 2 AND £ 36, otherwise ignored
* R0 = Value
Not re-entrant.
Get the numerical value of an inderected icon's text.
Note: ddUtil versions <0.37 returned an error if the icon was empty; now it returns 0
Basic example
SYS "ddu_GIV",Window,Icon TO Value
SYS "ddu_GIV",Window,Icon,16 TO Value
(see OS_ReadUnsigned (PRM 1-448) for a description of R2, possible errors and on how the value is treated)
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