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LB_ITEMFROMPOINT
An application sends this message to retrieve the zero-based index of the item
nearest the specified point in a list box.
LB_ITEMFROMPOINT
wParam = 0; // not used, must be zero
lParam = (LPARAM) MAKELPARAM(xPos, yPos); // coordinates of point
Parameters
xPos
Value of the low-order word of lParam. Specifies the x-coordinate of a point, relative to the upper-left corner of
the client area of the list box.
yPos
Value of the high-order word of lParam. Specifies the y-coordinate of a point, relative to the upper-left corner of
the client area of the list box.
Return Values
The return value contains the index of the nearest item in the low-order word.
The high-order word is zero if the specified point is in the client area of
the list box, or one if it is outside the client area.
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