public static extern bool PlayM4_SetFileEndCallback(int nPort, FileEndCallback feCallback, IntPtr pUser);
public static extern bool PlayM4_SetFileEndCallback(uint nPort, FileEndCallback callback, IntPtr ptr);
public static extern bool PlayM4_SetFileEndCallback(int nPort, FileEndCallback feCallback, IntPtr pUser);
public static extern bool PlayM4_SetFileEndCallback(uint nPort, FileEndCallback callback, IntPtr ptr);