TB_HITTEST message

Determines where a point lies in a toolbar control.

Parameters

wParam

Must be zero.

lParam

Pointer to a POINT structure that contains the x-coordinate of the hit test in the x member and the y-coordinate of the hit test in the y member. The coordinates are relative to the toolbar's client area.

Return value

Returns an integer value. If the return value is zero or a positive value, it is the zero-based index of the nonseparator item in which the point lies. If the return value is negative, the point does not lie within a button. The absolute value of the return value is the index of a separator item or the nearest nonseparator item.

Requirements