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.h"
int 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);
qmlRegisterType<MyObject>("com.mycompany.qmlcomponents", 1, 0, "MyObject");
qmlRegisterType<TestObject>("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 <QDebug>
class MyObject : public QObject
{
Q_OBJECT
Q_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.h"
MyObject::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 <QObject>
class TestObject : public QObject
{
Q_OBJECT
Q_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 1.0
Window {
id: window
objectName: "myWindow"
visible: true
width: 600
height: 250
title: 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: myObject
num: 101
name: "zhangSan"
onNumChanged: {
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: testObject
message: "HelloWorld..."
onMessageChanged: {
console.log("...new message is:> ", message)
}
Component.onCompleted: {
console.log("...init message is:>" + message)
}
}
Column {
spacing: 10
Button {
text: "qml中测试c++对象类型"
onClicked: {
myObject.num = 102
myObject.name = "wang"
testObject.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: myObject
onSendCpp1: {
console.log("......======" + message)
}
}
}
参考文章
https://blog.csdn.net/wzz953200463/article/details/129504685
