harmony 鸿蒙Subscribing to Freeze Events (C/C++)

  • 2025-06-12
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Subscribing to Freeze Events (C/C++)

Available APIs

For details about how to use the APIs (such as parameter usage restrictions and value ranges), see HiAppEvent.

Subscription APIs

API Description
int OH_HiAppEvent_AddWatcher (HiAppEvent_Watcher *watcher) Adds a watcher to listen for application events.
int OH_HiAppEvent_RemoveWatcher (HiAppEvent_Watcher *watcher) Removes a watcher to unsubscribe from application events.

How to Develop

The following describes how to subscribe to the freeze event triggered by a button click.

  1. Create a native C++ project and import the jsoncpp file to the project. The directory structure is as follows:
   entry:
     src:
       main:
         cpp:
           - json:
               - json.h
               - json-forwards.h
           - types:
               libentry:
                 - index.d.ts
           - CMakeLists.txt
           - napi_init.cpp
           - jsoncpp.cpp
         ets:
           - entryability:
               - EntryAbility.ets
           - pages:
               - Index.ets
  1. In the CMakeLists.txt file, add the source file and dynamic libraries.
   # Add the jsoncpp.cpp file, which is used to parse the JSON strings in the subscription events.
   add_library(entry SHARED napi_init.cpp jsoncpp.cpp)
   # Add libhiappevent_ndk.z.so and libhilog_ndk.z.so (log output).
   target_link_libraries(entry PUBLIC libace_napi.z.so libhilog_ndk.z.so libhiappevent_ndk.z.so)
  1. Import the dependency files to the napi_init.cpp file, and define LOG_TAG.
   #include "napi/native_api.h"
   #include "json/json.h"
   #include "hilog/log.h"
   #include "hiappevent/hiappevent.h"
   
   #undef LOG_TAG
   #define LOG_TAG "testTag"

  1. Subscribe to system events.

    • Watcher of the onReceive type:

    In the napi_init.cpp file, define the methods related to the watcher of the onReceive type.

     // Define a variable to cache the pointer to the created watcher.
 static HiAppEvent_Watcher *systemEventWatcher; 


 static void OnReceive(const char *domain, const struct HiAppEvent_AppEventGroup *appEventGroups, uint32_t groupLen) {
     for (int i = 0; i < groupLen; ++i) {
         for (int j = 0; j < appEventGroups[i].infoLen; ++j) {
             OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.domain=%{public}s", appEventGroups[i].appEventInfos[j].domain);
             OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.name=%{public}s", appEventGroups[i].appEventInfos[j].name);
             OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.eventType=%{public}d", appEventGroups[i].appEventInfos[j].type);
             if (strcmp(appEventGroups[i].appEventInfos[j].domain, DOMAIN_OS) == 0 && 
                 strcmp(appEventGroups[i].appEventInfos[j].name, EVENT_APP_FREEZE) == 0) {
                 Json::Value params;
                 Json::Reader reader(Json::Features::strictMode());
                 Json::FastWriter writer;
                 if (reader.parse(appEventGroups[i].appEventInfos[j].params, params)) {
                     auto time = params["time"].asInt64();
                     auto foreground = params["foreground"].asBool();
                     auto bundleVersion = params["bundle_version"].asString();
                     auto bundleName = params["bundle_name"].asString();
                     auto processName = params["process_name"].asString();
                     auto pid = params["pid"].asInt();
                     auto uid = params["uid"].asInt();
                     auto uuid = params["uuid"].asString();
                     auto exception = writer.write(params["exception"]);
                     auto hilogSize = params["hilog"].size();
                     auto handleSize =  params["event_handler"].size();
                     auto handleSize3s =  params["event_handler_size_3s"].asString();
                     auto handleSize6s =  params["event_handler_size_6s"].asString();
                     auto peerBindSize =  params["peer_binder"].size();
                     auto threadSize =  params["threads"].size();
                     auto memory =  writer.write(params["memory"]);
                     auto externalLog = writer.write(params["external_log"]);
                     auto logOverLimit = params["log_over_limit"].asBool();
                     OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.time=%{public}lld", time);
                     OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.foreground=%{public}d", foreground);
                     OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.bundle_version=%{public}s", bundleVersion.c_str());
                     OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.bundle_name=%{public}s", bundleName.c_str());
                     OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.process_name=%{public}s", processName.c_str());
                     OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.pid=%{public}d", pid);
                     OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.uid=%{public}d", uid);
                     OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.uuid=%{public}s", uuid.c_str());
                     OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.exception=%{public}s", exception.c_str());
                     OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.hilog.size=%{public}d", hilogSize);
                     OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.event_handler.size=%{public}d", handleSize);
                     OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.event_handler_3s.size=%{public}s", handleSize3s.c_str());
                     OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.event_handler_6s.size=%{public}s", handleSize6s.c_str());
                     OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.peer_binder.size=%{public}d", peerBindSize);
                     OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.threads.size=%{public}d", threadSize);
                     OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.memory=%{public}s", memory.c_str());
                     OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.external_log=%{public}s", externalLog.c_str());
                     OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.log_over_limit=%{public}d", logOverLimit);
                 }
             }
         }
     }
 }


 static napi_value RegisterWatcher(napi_env env, napi_callback_info info) {
     // Set the watcher name. The system identifies different watchers based on their names.
     systemEventWatcher = OH_HiAppEvent_CreateWatcher("onReceiverWatcher");
     // Set the event to watch to EVENT_APP_FREEZE.
     const char *names[] = {EVENT_APP_FREEZE};
     // Add the events to watch, for example, system events.
     OH_HiAppEvent_SetAppEventFilter(systemEventWatcher, DOMAIN_OS, 0, names, 1);
     // Set the implemented callback. After receiving the event, the watcher immediately triggers the OnReceive callback.
     OH_HiAppEvent_SetWatcherOnReceive(systemEventWatcher, OnReceive);
     // Add a watcher to listen for the specified event.
     OH_HiAppEvent_AddWatcher(systemEventWatcher);
     return {};
 }
    • Watcher of the onTrigger type:

    In the napi_init.cpp file, define the methods related to the watcher of the OnTrigger type.

     // Define a variable to cache the pointer to the created watcher.
 static HiAppEvent_Watcher *systemEventWatcher;


 // Implement the callback function used to return the listened events. The content pointed to by the events pointer is valid only in this function.
 static void OnTake(const char *const *events, uint32_t eventLen) {
     Json::Reader reader(Json::Features::strictMode());
     Json::FastWriter writer;
     for (int i = 0; i < eventLen; ++i) {
         Json::Value eventInfo;
         if (reader.parse(events[i], eventInfo)) {
             auto domain =  eventInfo["domain_"].asString();
             auto name = eventInfo["name_"].asString();
             auto type = eventInfo["type_"].asInt();
             OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.domain=%{public}s", domain.c_str());
             OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.name=%{public}s", name.c_str());
             OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.eventType=%{public}d", type);
             if (domain ==  DOMAIN_OS && name == EVENT_APP_FREEZE) {
                 auto time = eventInfo["time"].asInt64();
                 auto foreground = eventInfo["foreground"].asBool();
                 auto bundleVersion = eventInfo["bundle_version"].asString();
                 auto bundleName = eventInfo["bundle_name"].asString();
                 auto processName = eventInfo["process_name"].asString();
                 auto pid = eventInfo["pid"].asInt();
                 auto uid = eventInfo["uid"].asInt();
                 auto uuid = eventInfo["uuid"].asString();
                 auto exception = writer.write(eventInfo["exception"]);
                 auto hilogSize = eventInfo["hilog"].size();
                 auto handleSize =  eventInfo["event_handler"].size();
                 auto handleSize3s =  eventInfo["event_handler_size_3s"].asString();
                 auto handleSize6s =  eventInfo["event_handler_size_6s"].asString();
                 auto peerBindSize =  eventInfo["peer_binder"].size();
                 auto threadSize =  eventInfo["threads"].size();
                  auto memory =  writer.write(eventInfo["memory"]);
                 auto externalLog = writer.write(eventInfo["external_log"]);
                 auto logOverLimit = eventInfo["log_over_limit"].asBool();
                 OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.time=%{public}lld", time);
                 OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.foreground=%{public}d", foreground);
                 OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.bundle_version=%{public}s", bundleVersion.c_str());
                 OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.bundle_name=%{public}s", bundleName.c_str());
                 OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.process_name=%{public}s", processName.c_str());
                 OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.pid=%{public}d", pid);
                 OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.uid=%{public}d", uid);
                 OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.uuid=%{public}s", uuid.c_str());
                 OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.exception=%{public}s", exception.c_str());
                 OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.hilog.size=%{public}d", hilogSize);
                 OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.event_handler.size=%{public}d", handleSize);
                 OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.event_handler_3s.size=%{public}s", handleSize3s.c_str());
                 OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.event_handler_6s.size=%{public}s", handleSize6s.c_str());
                 OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.peer_binder.size=%{public}d", peerBindSize);
                 OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.threads.size=%{public}d", threadSize);
                 OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.memory=%{public}s", memory.c_str());
                 OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.external_log=%{public}s", externalLog.c_str());
                 OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.log_over_limit=%{public}d", logOverLimit);
             }
         }
     }
 }


 // Implement the subscription callback function to apply custom processing to the obtained event logging data.
 static void OnTrigger(int row, int size) {
     // After the callback is received, obtain the specified number of received events.
     OH_HiAppEvent_TakeWatcherData(systemEventWatcher, row, OnTake);
 }


 static napi_value RegisterWatcher(napi_env env, napi_callback_info info) {
     // Set the watcher name. The system identifies different watchers based on their names.
     systemEventWatcher = OH_HiAppEvent_CreateWatcher("onTriggerWatcher");
     // Set the event to watch to EVENT_APP_FREEZE.
     const char *names[] = {EVENT_APP_FREEZE};
     // Add the events to watch, for example, system events.
     OH_HiAppEvent_SetAppEventFilter(systemEventWatcher, DOMAIN_OS, 0, names, 1);
     // Set the implemented callback function. The callback function will be triggered when the conditions set by OH_HiAppEvent_SetTriggerCondition are met.
     OH_HiAppEvent_SetWatcherOnTrigger(systemEventWatcher, OnTrigger);
     // Set the conditions for triggering the subscription callback. For example, trigger this onTrigger callback when the number of new event logs is 1.
     OH_HiAppEvent_SetTriggerCondition(systemEventWatcher, 1, 0, 0);
     // Add a watcher to listen for the specified event.
     OH_HiAppEvent_AddWatcher(systemEventWatcher);
     return {};
 }

  2. Register RegisterWatcher as an ArkTS API.

In the napi_init.cpp file, register RegisterWatcher as an ArkTS API.

   static napi_value Init(napi_env env, napi_value exports)
   {
       napi_property_descriptor desc[] = {
           { "registerWatcher", nullptr, RegisterWatcher, nullptr, nullptr, nullptr, napi_default, nullptr }
       };
       napi_define_properties(env, exports, sizeof(desc) / sizeof(desc[0]), desc);
       return exports;
   }

In the index.d.ts file, define the ArkTS API.

   export const registerWatcher: () => void;
  1. In the EntryAbility.ets file, add the following interface invocation to onCreate().
   // Import the dependent module.
   import testNapi from 'libentry.so'

   // Add the interface invocation to onCreate().
   // Register the system event watcher at startup.
   testNapi.registerWatcher();
  1. In the Index.ets file, add a button to trigger the freeze event.
   Button("appFreeze").onClick(() => {
     setTimeout(()=>{
       while(true) {}
     }, 1000)
   })

  1. In DevEco Studio, click the Run button to run the project. Then, click the appfreeze button to trigger a freeze event.

  2. The application crashes. After restarting the application, you can view the following event information in the Log window.

   HiAppEvent eventInfo.domain=OS
   HiAppEvent eventInfo.name=APP_FREEZE
   HiAppEvent eventInfo.eventType=1
   HiAppEvent eventInfo.params.time=1502049167732
   HiAppEvent eventInfo.params.foreground=1
   HiAppEvent eventInfo.params.bundle_version=1.0.0
   HiAppEvent eventInfo.params.bundle_name=com.example.myapplication
   HiAppEvent eventInfo.params.process_name=com.example.myapplication
   HiAppEvent eventInfo.params.pid=1587
   HiAppEvent eventInfo.params.uid=20010043
   HiAppEvent eventInfo.params.uuid=a78a23b20f3dd9730f18a5cfa2304deac1104ac4086755c4a59cf7c72d414e2e
   HiAppEvent eventInfo.params.exception={"message":"App main thread is not response!","name":"THREAD_BLOCK_6S"}
   HiAppEvent eventInfo.params.hilog.size=6
   HiAppEvent eventInfo.params.event_handler.size=16
   HiAppEvent eventInfo.params.event_handler_3s.size=15
   HiAppEvent eventInfo.params.event_handler_6s.size=16
   HiAppEvent eventInfo.params.peer_binder.size=0
   HiAppEvent eventInfo.params.threads.size=28
   HiAppEvent eventInfo.params.memory={"pss":0,"rss":0,"sys_avail_mem":1326520,"sys_free_mem":940588,"sys_total_mem":1992340,"vss":0}
   HiAppEvent eventInfo.params.external_log=["/data/storage/el2/log/hiappevent/APP_FREEZE_1502049185239_1587.log"]
   HiAppEvent eventInfo.params.log_over_limit=0

  1. Remove the event watcher.

    static napi_value RemoveWatcher(napi_env env, napi_callback_info info) {
    // Remove the watcher.
    OH_HiAppEvent_RemoveWatcher(systemEventWatcher);
    return {};
}

  2. Destroy the event watcher.

    static napi_value DestroyWatcher(napi_env env, napi_callback_info info) {
    // Destroy the created watcher and set systemEventWatcher to nullptr.
    OH_HiAppEvent_DestroyWatcher(systemEventWatcher);
    systemEventWatcher = nullptr;
    return {};
}

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