WM_HITTEST - Parameters

ptspointerpos (POINTS)

Pointer position.

The pointer position is in window coordinates relative to the bottom-left corner of the window.

ulReserved (ULONG)

Reserved value, should be 0.

ulresult (ULONG)

Hit-test indicator.

The application may return one of these values:

HT_NORMAL

The message should be processed as normal. A WM_MOUSEMOVE, WM_BUTTON2DOWN, or WM_BUTTON1DOWN message is posted to the window.
HT_TRANSPARENT
The part of the window underneath the pointer is transparent; hit-testing should continue on windows underneath this window, as if the window did not exist.
HT_DISCARD
The message should be discarded; no message is posted to the application.
HT_ERROR
As HT_DISCARD, except that if the message is a button-down message, an alarm sounds and the window concerned is brought to the foreground.

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