hwnd (HWND) - input

Handle of window whose update rectangle is to be queried.

prclPrc (PRECTL) - output

Update region that bounds the rectangle (in window coordinates).

Note: The value of each field in this structure must be in the range -32 768 through 32 767. The data type WRECT may also be used, if supported by the language.

rc (BOOL) - returns

Success indicator.

TRUE

Successful completion
FALSE
Error occurred, or window has no update region; it is wholly valid, therefore prclPrc is NULL.

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