The DIEFFECT structure is defined as :-

struct DIEFFECT {
DWORD dwSize;
DWORD dwFlags;
DWORD dwDuration;
DWORD dwSamplePeriod;
DWORD dwGain;
DWORD dwTriggerButton;
DWORD dwTriggerRepeatInterval;
DWORD cAxes;
LPDWORD rgdwAxes;
LPLONG rglDirection;
LPDIENVELOPE lpEnvelope;
DWORD cbTypeSpecificParams;
LPVOID lpvTypeSpecificParams;
DWORD dwStartDelay;
};