Function projectm_set_preset_switch_failed_event_callback 

pub unsafe extern "C" fn projectm_set_preset_switch_failed_event_callback(
    instance: projectm_handle,
    callback: projectm_preset_switch_failed_event,
    user_data: *mut c_void,
)

@brief Sets a callback function that will be called when a preset change failed.

Only one callback can be registered per projectM instance. To remove the callback, use NULL.

@param instance The projectM instance handle. @param callback A pointer to the callback function. @param user_data A pointer to any data that will be sent back in the callback, e.g. context information.