|Microsoft DirectX 9.0|
Removes the effect from the device. If the effect is playing, it is automatically stopped before it is unloaded.
If the method succeeds, the return value is DI_OK.
If the method fails, the return value can be one of the following error values:
DIERR_INPUTLOST Access to the input device has been lost. It must be reacquired. DIERR_INVALIDPARAM An invalid parameter was passed to the returning function, or the object was not in a state that permitted the function to be called. This value is equal to the E_INVALIDARG standard Component Object Model (COM) return value. DIERR_NOTEXCLUSIVEACQUIRED The operation cannot be performed unless the device is acquired in DISCL_EXCLUSIVE mode. DIERR_NOTINITIALIZED The object has not been initialized.