[英]return a custom object from QT C++ and print properties in QML
我需要從C ++傳遞給QML一個對象來打印它。 所以,我有這個.h:
#ifndef SETTINGSOVEN_H
#define SETTINGSOVEN_H
#include <QObject>
#include <objects/settings.h>
class settingsoven : public QObject
{
Q_OBJECT
public:
explicit settingsoven(QObject *parent = nullptr);
Q_INVOKABLE Settings loadStartPage();
Q_PROPERTY(Settings settingsObject READ getSettings WRITE setSettings NOTIFY settingsChanged)
signals:
void settingsChanged();
public slots:
Settings getSettings();
void setSettings(Settings settingsObject);
private:
Settings m_settingsObject;
};
#endif // SETTINGSOVEN_H
和我的cpp:
#include "settingsoven.h"
#include "objects/singleton.h"
#include "functions/jsonfunctions.h"
settingsoven::settingsoven(QObject *parent) : QObject(parent)
{
}
Settings settingsoven::loadStartPage()
{
singleton::instance().settingsList = JsonFunctions::getConfiguration(singleton::instance().ovenClicked.id, singleton::instance().token_type, singleton::instance().access_token);
m_settingsObject = singleton::instance().settingsList.at(0);
return m_settingsObject;
}
Settings settingsoven::getSettings()
{
return m_settingsObject;
}
void settingsoven::setSettings(Settings settingsObject)
{
m_settingsObject = settingsObject;
emit settingsChanged();
}
並按照我的qml代碼:
...
Page {
width: Screen.width
height: Screen.height
Component.onCompleted: {
settingsOvenToQML.loadStartPage();
//console.log("test:" + configuration.gmt);
console.log("proopertie print:" + settingsOvenToQML.settingsObject.id);
//i need to print here the properties
}
...
我需要在qml:settings中打印的自定義對象
#ifndef SETTINGS_H
#define SETTINGS_H
#include <QString>
#include <QVariant>
class Settings
{
public:
Settings();
QString id;
QString gmt;
QVariant rtc;
QString thing_name;
QString sw_gw;
QVariant sw_ui;
QString wlan_ip_address;
QString eth_ip_address;
QString hostname;
qint32 mdl;
quint32 mdl_code;
quint32 tmp_unit;
quint32 h2o_hdns;
quint32 oven_no;
quint32 alarm_wash_to;
qint32 clean_to;
qint8 clean_notice_to;
qint8 decal_notice_to;
bool gas_test;
bool warn_decal_on;
bool warn_prb_on;
qint8 primary_prb;
qint8 time_fmt;
qint8 date_fmt;
bool preheat_otp;
bool cooldown_opt;
qint8 ext_prb_type;
qint8 haccp_scan;
bool h2o_drain;
bool chiller_opt;
QString lang;
qint8 backlight_lvl;
QString video_ver;
QString oven_name;
QString video_build;
QString os_ver;
QString os_build;
QString q1_ver;
QString q1_build;
QString q1_check;
QString q2_ver;
QString q2_build;
QString q2_check;
QString chill_ver;
QString chill_build;
QString chill_check;
QString mac_addr;
};
#endif // SETTINGS_H
我是新的qt程序員,我想知道如何從qt打印一個對象。 我相信我的代碼是正確的,但是不起作用。 哪里我錯了? 可以直接在c ++中用qml打印自定義對象嗎? 一些幫助 ? 謝謝
我不確定你的意思是“print”,但如果你想能夠訪問一個對象的屬性,它必須是QObject
派生的,或者有Q_GADGET
宏,所以MOC可以生成必要的元數據QML需要知道對象是什么。
此外,您必須以某種方式公開屬性,公共成員將不適用於QML。 您需要Q_PROPERTY
或通過Q_INVOKABLE
getter返回值。
#define QPROP(type, name) \
Q_PROPERTY(type name MEMBER m_##name) \
type m_##name;
class Settings {
Q_GADGET
QPROP(QString, id)
QPROP(QString, gmt)
QPROP(QVariant, rtc)
// and so on
public:
Settings();
}
Q_DECLARE_METATYPE(Settings) // last but not least
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