Contains type-specific information for effects that are marked as DIEFT_RAMPFORCE. The structure describes a ramp force effect.
A pointer to a single DIRAMPFORCE structure for an effect is passed in the lpvTypeSpecificParams member of the DIEFFECT structure.
typedef struct DIRAMPFORCE { LONG lStart; LONG lEnd; } DIRAMPFORCE, *LPDIRAMPFORCE;
The dwDuration for a ramp force effect cannot be INFINITE.