SLM_QUERYTICKSIZE - Syntax

This message queries for the size of a tick mark for the primary scale. All tick marks default to a size of 0 (invisible) if not set by the application with the SLM_SETTICKSIZE message.

param1
     USHORT  usTickNum   /*  Tick mark location. */

param2
     ULONG   ulReserved  /*  Reserved value, should be 0. */