6.7 Identifier reference

invalidateRect

The ML function invalidateRect corresponds to the C function InalidateRect in the Windows SDK. It has the following type:

val invalidateRect : hwnd * rect MLWorks.Option.option * bool
                     -> unit

Whereas the Windows function returns a BOOL, the ML function returns unit, and raises an exception if the function fails. Furthermore, the ML function passes the actual rect structure, whereas the Windows function passes a pointer.

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