harmony 鸿蒙Subscribing to Freeze Events (C/C++)
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.
- 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
- 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)
- 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"
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 {}; }
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;
- 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();
- In the Index.ets file, add a button to trigger the freeze event.
Button("appFreeze").onClick(() => {
setTimeout(()=>{
while(true) {}
}, 1000)
})
In DevEco Studio, click the Run button to run the project. Then, click the appfreeze button to trigger a freeze event.
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
Remove the event watcher.
static napi_value RemoveWatcher(napi_env env, napi_callback_info info) { // Remove the watcher. OH_HiAppEvent_RemoveWatcher(systemEventWatcher); return {}; }
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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