做的好看的统一登录网站,旅游网站建设与实现,手机软件app制作的三种方式,网站建设规范方案qml端使用C对象类型、qml端调用C函数/c端调用qml端函数、qml端发信号-连接C端槽函数、C端发信号-连接qml端函数等。 代码资源下载#xff1a; https://download.csdn.net/download/TianYanRen111/88779433 若无法下载#xff0c;直接拷贝以下代码测试即可。
main.cpp
#incl…qml端使用C对象类型、qml端调用C函数/c端调用qml端函数、qml端发信号-连接C端槽函数、C端发信号-连接qml端函数等。 代码资源下载 https://download.csdn.net/download/TianYanRen111/88779433 若无法下载直接拷贝以下代码测试即可。
main.cpp
#include QGuiApplication
#include QQmlApplicationEngine
#include QQmlContext
#include MyObject.h
#include TestObject.hint main(int argc, char *argv[])
{QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);QGuiApplication app(argc, argv);QQmlApplicationEngine engine;const QUrl url(QStringLiteral(qrc:/main.qml));QObject::connect(engine, QQmlApplicationEngine::objectCreated,app, [url](QObject *obj, const QUrl objUrl) {if (!obj url objUrl)QCoreApplication::exit(-1);}, Qt::QueuedConnection);qmlRegisterTypeMyObject(com.mycompany.qmlcomponents, 1, 0, MyObject);qmlRegisterTypeTestObject(com.mycompany.qmlcomponents, 1, 0, TestObject);engine.load(url);//auto objs engine.rootObjects();auto window objs.first();// c 绑定信号槽C端发信号// 此种形式必须将信号设置为 QVariant类型MyObject obj;QObject::connect(obj, SIGNAL(sendCpp2(QVariant, QVariant)), window, SLOT(slotCpp(QVariant, QVariant)));obj.test2(); // 发送信号// c端调用qml端函数qDebug()objs.first()-objectName();QVariant ret;QVariant arg1 123333;QVariant arg2 zhangsan;QMetaObject::invokeMethod(window, qmlFunc, Q_RETURN_ARG(QVariant, ret),Q_ARG(QVariant, arg1),Q_ARG(QVariant, arg2));return app.exec();
}
MyObject.h
#ifndef MYOBJECT_H
#define MYOBJECT_H#include QObject
#include QDebugclass MyObject : public QObject
{Q_OBJECTQ_PROPERTY(int num READ num WRITE setNum NOTIFY numChanged)Q_PROPERTY(QString name READ name WRITE setName NOTIFY nameChanged)public:explicit MyObject(QObject *parent nullptr); int num() const;QString name() const;Q_INVOKABLE void printMessage();Q_INVOKABLE void test1() {emit sendCpp1(--------------111111-------);}void test2() {emit sendCpp2(---------2222222222------------series, 222222222222);}public slots:void setNum(int num);void setName(QString name);void onMsg(QString msg, int value);signals:void numChanged(int num);void nameChanged(QString name);void sendCpp1(QString message);void sendCpp2(QVariant message, QVariant value);private:int m_num;QString m_name;
};#endif // MYOBJECT_H
MyObject.cpp
#include MyObject.hMyObject::MyObject(QObject *parent) : QObject(parent)
{}int MyObject::num() const
{return m_num;
}QString MyObject::name() const
{return m_name;
}void MyObject::printMessage()
{qDebug() message is: 11111111111;
}void MyObject::setNum(int num)
{if (m_num num)return;m_num num;emit numChanged(m_num);
}void MyObject::setName(QString name)
{if (m_name name)return;m_name name;emit nameChanged(m_name);
}void MyObject::onMsg(QString msg, int value)
{qDebug() ################ msg:value is: msg value;
}
TestObject.h
#ifndef TESTOBJECT_H
#define TESTOBJECT_H#include QObjectclass TestObject : public QObject
{Q_OBJECTQ_PROPERTY(QString message READ message WRITE setMessage NOTIFY messageChanged)public:explicit TestObject(QObject *parent nullptr);QString message() const {return m_message;}public slots:void setMessage(QString message) {{if (m_message message)return;m_message message;emit messageChanged(m_message);}}signals:void messageChanged(QString message);private:QString m_messsage;QString m_message;
};#endif // TESTOBJECT_H
main.qml
import QtQuick 2.0
import QtQuick.Controls 2.12
import QtQuick.Window 2.12
import QtQuick.Layouts 1.3
import QtQml 2.12
import com.mycompany.qmlcomponents 1.0Window {id: windowobjectName: myWindowvisible: truewidth: 600height: 250title: qsTr(Hello World)signal sendMsg(string msg, int value)function slotCpp(message, value) {console.log(... message value)}function qmlFunc(msg, value) {console.log(......qml function... msg:value: , msg, value)}MyObject {id: myObjectnum: 101name: zhangSanonNumChanged: {console.log(...new num is: , num)}onNameChanged: {console.log(...new name is: , name)}Component.onCompleted: {console.log(...init num and name is: num name)}}TestObject {id: testObjectmessage: HelloWorld...onMessageChanged: {console.log(...new message is: , message)}Component.onCompleted: {console.log(...init message is: message)}}Column {spacing: 10Button {text: qml中测试c对象类型onClicked: {myObject.num 102myObject.name wangtestObject.message HelloWorld, I love you...}}Button {text: qml端调用C端函数onClicked: {myObject.printMessage()}}Button {text: qml端发送信号, 连接C端槽函数onClicked: {sendMsg(...qml signal, 66666666)}}Button {text: C端发送信号, 连接qml端槽函数onClicked: {myObject.test1()}}}// qml信号连接C槽函数方式一// Connections {// target: window// onSendMsg: {// myObject.onMsg(...qml signal, 8888888)// }// }//qml信号连接C槽函数方式二Component.onCompleted: {window.sendMsg.connect(myObject.onMsg)}Connections {target: myObjectonSendCpp1: {console.log(...... message)}}
} 参考文章 https://blog.csdn.net/wzz953200463/article/details/129504685
