fix:修复MeasurementDataManager析构时出现的'QObject::startTimer: Timers can only be used with threads started with QThread‘错误

dataPanel/dpBarsChart.cpp

@@ -211,7 +211,8 @@ void dpBarsChart::setDateTime(const QDateTime& dateTime)
             if(data.timestamp == 0)
                 continue;
 
-            static double marginFactor = 1.0;
+            //qDebug() << it.key() << ": " << data.value;
+            static double marginFactor = 0.0;
             double dData = data.value;
             Bars bar = it.value();
             //调整所在轴的范围

include/measurementDataManager.h

@@ -5,7 +5,6 @@
 #include <QObject>
 #include <QHash>
 #include <QUrl>
-#include <QTimer>
 
 class QSettings;
 class QNetworkAccessManager;
@@ -19,6 +18,7 @@ class MeasurementDataManager : public QObject
 
 public:
     static MeasurementDataManager* instance();
+    static void destroyInstance();
 
     void requestData(const QStringList& measurements, QObject* requester);
     void cancelRequest(const QStringList& measurements, QObject* requester);
@@ -71,6 +71,20 @@ private:
     explicit MeasurementDataManager();
     ~MeasurementDataManager();
 
+    static MeasurementDataManager* m_instance;
+
+    class CGarbo
+    {
+    public:
+        CGarbo() {};
+        ~CGarbo()
+        {
+            if(m_instance)
+                delete m_instance;
+            m_instance = nullptr;
+        }
+    };
+
     void initialize();
     //实时数据
     void buildSubscriptionRequest(const QString& action, const QStringList& measurements);

include/measurementDataUtils.h

@@ -4,6 +4,7 @@
 #include "networkCommon.h"
 #include <QObject>
 #include <QWebSocket>
+#include <QTimer>
 
 struct MeasurementDataPoint
 {
@@ -59,7 +60,6 @@ private:
  *
  * 负责与后台数据服务建立WebSocket连接，接收实时数据
  */
-class QTimer;
 class WebSocketClient : public QObject
 {
     Q_OBJECT
@@ -97,7 +97,7 @@ private:
     QUrl m_serverUrl;
 
     //重连相关
-    QTimer* m_reconnectTimer;
+    QTimer m_reconnectTimer;
     int m_reconnectInterval;
     int m_reconnectAttempts;
     int m_maxReconnectAttempts;

source/main.cpp

@@ -3,6 +3,7 @@
 #include <QApplication>
 #include <QScreen>
 #include <QSysInfo>
+#include "measurementDataManager.h"
 
 int main(int argc, char *argv[])
 {
@@ -28,5 +29,7 @@ int main(int argc, char *argv[])
     QApplication a(argc, argv);
     MainWindow w;
     w.showMaximized();
-    return a.exec();
+    int ret = a.exec();
+    MeasurementDataManager::destroyInstance();
+    return ret;
 }

source/measurementDataManager.cpp

@@ -14,10 +14,25 @@
 #include <QJsonParseError>
 #include <QCoreApplication>
 
+MeasurementDataManager* MeasurementDataManager::m_instance = nullptr;
+
 MeasurementDataManager* MeasurementDataManager::instance()
 {
-    static MeasurementDataManager instance;
+    // static MeasurementDataManager instance;
-    return &instance;
+    // return &instance;
+
+    //不采用静态局部变量的方式实现，因为QTimer析构时需要依赖事件循环，静态局部变量的释放实在main函数之后，此时事件循环已退出(app.exec())
+    //所以增加destroyInstance()，在main函数退出之前显示调用，即可规避此问题
+    if(!m_instance)
+        m_instance = new MeasurementDataManager();
+    return m_instance;
+}
+
+void MeasurementDataManager::destroyInstance()
+{
+    if(m_instance)
+        delete m_instance;
+    m_instance = nullptr;
 }
 
 MeasurementDataManager::MeasurementDataManager()
@@ -25,12 +40,14 @@ MeasurementDataManager::MeasurementDataManager()
     , m_networkManager(new QNetworkAccessManager(this))
     , m_webSocketClient(new WebSocketClient(this))
 {
+    //static CGarbo garbo;
     initialize();
     connect(m_webSocketClient, &WebSocketClient::dataReceived, this, &MeasurementDataManager::onReceiveRealtimeData);
 }
 
 MeasurementDataManager::~MeasurementDataManager()
-{}
+{
+}
 
 void MeasurementDataManager::initialize()
 {
@@ -59,6 +76,7 @@ void MeasurementDataManager::initialize()
     //开启缓存数据的定期清理
     m_dataCleanupInterval = 10 * 1000;
     m_dataCleanupTimer.setInterval(m_dataCleanupInterval);
+    m_dataCleanupTimer.start();
     connect(&m_dataCleanupTimer, &QTimer::timeout, this, &MeasurementDataManager::cleanUpDataCache);
 }
 

source/measurementDataUtils.cpp

@@ -67,15 +67,15 @@ WebSocketClient::WebSocketClient(QObject* parent)
     , m_webSocket(nullptr)
     , m_connected(false)
     , m_connectionStatus(ConnectionStatus::Disconnected)
-    , m_reconnectTimer(new QTimer(this))
+    //, m_reconnectTimer(new QTimer(this))
     , m_reconnectInterval(5000) //默认5秒重连
     , m_reconnectAttempts(0)
     , m_maxReconnectAttempts(10) //默认最多重连10次
 {
     setupWebSocket();
 
-    m_reconnectTimer->setSingleShot(true);
+    m_reconnectTimer.setSingleShot(true);
-    connect(m_reconnectTimer, &QTimer::timeout, this, &WebSocketClient::onReconnectTimeout);
+    connect(&m_reconnectTimer, &QTimer::timeout, this, &WebSocketClient::onReconnectTimeout);
 }
 
 WebSocketClient::~WebSocketClient()
@@ -166,7 +166,8 @@ void WebSocketClient::scheduleReconnect()
         // 限制最大延迟为5分钟
         delay = qMin(delay, 300000);*/
 
-        m_reconnectTimer->start(delay);
+        // m_reconnectTimer->start(delay);
+        m_reconnectTimer.start(delay);
         m_reconnectAttempts++;
         m_connectionStatus = ConnectionStatus::Reconncting;
     }
@@ -174,8 +175,10 @@ void WebSocketClient::scheduleReconnect()
 
 void WebSocketClient::resetReconnect()
 {
-    if(m_reconnectTimer->isActive())
+    // if(m_reconnectTimer->isActive())
-        m_reconnectTimer->stop();
+    //     m_reconnectTimer->stop();
+    if(m_reconnectTimer.isActive())
+        m_reconnectTimer.stop();
     m_reconnectAttempts = 0;
 }