hwnd (HWND) - input

Window handle.

lDx (LONG) - input

Amount of horizontal scroll to the right (in device units).

lDy (LONG) - input

Amount of vertical scroll upward (in device units).

prclScroll (PRECTL) - input

Scroll rectangle.

If this is NULL, the entire window is scrolled.

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.

prclClip (PRECTL) - input

Clip rectangle.

If not NULL, this defines a clip rectangle that clips the destination of the scroll.

hrgnUpdateRgn (HRGN) - input

Update region.

If not NULLHANDLE, this contains the region uncovered by the scroll when returned.

prclUpdate (PRECTL) - in/out

Update rectangle.

If not NULL, this contains the bounding rectangle of the invalid bits uncovered by the scroll when returned.

flOptions (ULONG) - input

Scroll options.

SW_SCROLLCHILDREN

Unless this is set, child windows are not scrolled. If this is set, and prclScroll is NULL, all the child windows are scrolled by lDx and lDy units. If prclScroll is not NULL, only those child windows that intersect prclScroll are scrolled.
SW_INVALIDATERGN
The invalid region created as a result of the scroll is added to the update regions of those windows affected. This may result in sending WM_PAINT messages to CS_SYNCPAINT windows before the call returns.

lComplexity (LONG) - returns

Complexity of resulting region/error indicator.

RGN_NULL

NULL rectangle invalid
RGN_RECT
Simple rectangle invalid
RGN_COMPLEX
Complex rectangle invalid
RGN_ERROR
Error.

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