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[英]QML access C++ model from parent component in nested object
[英]Access to existing QML component from C++
我是QML的新手,無法解決一個簡單的問題。 我想從C ++訪問QML組件,但不能。 指針test
始終為0。這可能是什么原因?
代碼如下:
main.cpp
int main(int argc, char *argv[])
{
QGuiApplication &app=reg6::Bonder::BonderGuiApplication::instance();
QQmlApplicationEngine engine;
engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
QObject* test=engine.rootObjects().first()->findChild<QObject*> ("cameraArea");
test->setProperty("color","black");
return app.exec();
}
main.qml
import QtQuick 2.5
import QtQuick.Controls 1.4
import QtQuick.Dialogs 1.2
import QtQuick.Layouts 1.0
ApplicationWindow {
visible: true
width: 1800
height: 900
SplitView
{
anchors.fill: parent
orientation: Qt.Vertical
SplitView {
Layout.fillHeight: true
SplitView {
orientation: Qt.Vertical
width:400
Layout.minimumWidth: 400
Layout.maximumWidth: 500
Camera {
id: cameraArea
height: 400
Layout.maximumHeight: 400
Layout.minimumHeight: 300
}
List {
id: listArea
}
}
Bonder {
id: mainArea
Layout.fillWidth: true
}
Properties {
id: propertiesArea
Layout.minimumWidth: 300
Layout.maximumWidth: 400
}
}
Error {
id: errorArea
Layout.minimumHeight: 100
height: 200
}
}
}
Camera.qml
import QtQuick 2.5
Rectangle {
color: "lightblue"
}
你必須設置的objectName
也QML組件的屬性來獲取一個有效的指針到您QObject
因為T QObject::findChild(const QString &name = QString(), Qt::FindChildOptions options = Qt::FindChildrenRecursively) const
需要objectName
不是ID
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