XPLMRegisterAvionicsCallbacksEx

XPLMRegisterAvionicsCallbacksEx

XPLM_API XPLMAvionicsID XPLMRegisterAvionicsCallbacksEx(
                         XPLMCustomizeAvionics_t * inParams);

This routine registers your callbacks for a built-in device. This returns a handle. If the returned handle is NULL, there was a problem interpreting your input, most likely the struct size was wrong for your SDK version. If the returned handle is not NULL, your callbacks will be called according to schedule as long as your plugin is not deactivated, or unloaded, or you call XPLMUnregisterAvionicsCallbacks().

Note that you cannot register new callbacks for a device that is not a built-in one (for example a device that you have created, or a device another plugin has created).