| Microsoft DirectX 8.1 (C++) | 
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; 
 
typedef const DIRAMPFORCE *LPCDIRAMPFORCE;
The dwDuration for a ramp force effect cannot be INFINITE.
  Windows NT/2000/XP: Requires Windows 2000.
  Windows 98/Me: Requires Windows 98 or later. Available as a redistributable for Windows 98.
  Header: Declared in Dinput.h.