qt qml和c++的互相调用方式

#include "mainwindow.h" #include <QApplication> #include <QUrl> #include <QQmlApplicationEngine> #include <QObject> #include <QQmlContext> // qml中和c++互相调用的类； #include <sdpsystrayicon.h> #include <SDPHttpRequest.h> #include <SDPWorkThread.h> // qml中和c++互相调用的类； end； int main(int argc, char *argv[]) { QApplication app(argc, argv); // MainWindow w; // w.show(); int runMode = 0; if(argc == 2) runMode = atoi(argv[1]); // qml使用demo： QQmlApplicationEngine engine; //注册C++线程类为Qml的组件 qmlRegisterType<WorkTaskPool>("MyWorkTaskPool", 1,0, "MyWorkTaskPool"); // qml里面的异步线程； const QUrl url(QUrl("qrc:/qml/main.qml")); QObject::connect(&engine, &QQmlApplicationEngine::objectCreated, &app, [url](QObject *obj, const QUrl &objUrl) { if (!obj && url == objUrl) QCoreApplication::exit(-1); }, Qt::QueuedConnection); engine.load(url); QObject* root = NULL; QList<QObject*> rootObjects = engine.rootObjects(); for(int i = 0; i<rootObjects.size();i++) { if(rootObjects.at(i)->objectName() == "rootObject") { root = rootObjects.at(i); break; } } //暴露http请求对象给qml QScopedPointer<myHttpRequest> myHttprequest(new myHttpRequest(runMode)); engine.rootContext()->setContextProperty("myHttprequest",myHttprequest.data()); //暴露系统托盘类 QScopedPointer<SDPSysTrayIcon> mySysTrayIcon(new SDPSysTrayIcon(root)); engine.rootContext()->setContextProperty("mySysTrayIcon",mySysTrayIcon.data()); return app.exec(); }