Unsubscribing from Common Events in C

When to Use

After completing service requirements, subscribers need to unsubscribe from common events.

Available APIs

For details about the APIs, see oh_commonevent.h.

API	Description
CommonEvent_ErrCode OH_CommonEvent_UnSubscribe(const CommonEvent_Subscriber* subscriber)	Unsubscribes from a common event.

How to Develop

1. Include header files.

   #include "hilog/log.h"
   #include "BasicServicesKit/oh_commonevent.h"
   

   common_event_unsubscribe.h

2. Add dynamic link libraries to the CMake script.

   target_link_libraries(entry PUBLIC
       libace_napi.z.so
       libhilog_ndk.z.so
       libohcommonevent.so
   )
   

3. Unsubscribe from a common event.

   After a subscriber subscribes to a common event and meets service requirements, the subscriber can use OH_CommonEvent_UnSubscribe to unsubscribe from the event.

   void Unsubscribe(CommonEvent_Subscriber *subscriber)
   {
       // Unsubscribe from a common event by passing a subscriber.
       int32_t ret = OH_CommonEvent_UnSubscribe(subscriber);
       OH_LOG_Print(LOG_APP, LOG_INFO, 1, "CES_TEST", "OH_CommonEvent_UnSubscribe ret <%{public}d>.", ret);
   }
   

   common_event_unsubscribe.cpp