# FFEffectEscape(_:_:) Sends a hardware-specific command to the driver. ``` func FFEffectEscape(_ effectReference: FFEffectObjectReference!, _ pFFEffectEscape: UnsafeMutablePointer!) -> HRESULT ``` ## Parameters `effectReference` An opaque reference handle to an effect object. This is obtained from a previous call to FFDeviceCreateEffect. `pFFEffectEscape` FFEFFESCAPE structure that describes the command to be sent. On success, the cbOutBuffer member contains the number of bytes of the output buffer used. ## Return Value If the method succeeds, the return value is FF_OK. If the method fails, the return value can be one of the following error values: ## Discussion FFERR_INVALIDPARAM FFERR_NOTDOWNLOADED FFERR_UNSUPPORTED Other device-specific error codes are also possible. Ask the hardware manufacturer for details ## Discussion Because each driver implements different escapes, it is the application’s responsibility to ensure that it is sending the escape to the correct driver. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)