An application sends an LB_SETITEMHEIGHT message to set the height, in pixels, of items in a list box. If the list box has the LBS_OWNERDRAWVARIABLE style, this message sets the height of the item specified by the index parameter. Otherwise, this message sets the height of all items in the list box.
LB_SETITEMHEIGHT wParam = (WPARAM) index; // item index lParam = MAKELPARAM(cyItem, 0); // item height
Windows 95: The wParam parameter is limited to 16-bit values.
This means list boxes cannot contain more than 32,767 items. Although the
number of items is restricted, the total size in bytes of the items in a
listbox is limited only by available memory.
If the index or height is invalid, the return value is LB_ERR.