访问组合框数据模型

Question

我正在将 QJsonArray 从 C++ 发送到 QML 组合框：

netlib.h

void discoveryResultChanged(const QJsonArray jsonArray);

netlib.cpp

QByteArray answer_ba = reply->readAll();
QJsonDocument answer_json_doc = QJsonDocument::fromJson(answer_ba);
QJsonObject answer_json_obj = answer_json_doc.object();
QJsonArray answer_json_array = answer_json_obj["printers_array"].toArray();
qDebug() << __func__ << "JSON array: " << answer_json_array;
emit discoveryResultChanged(answer_json_array);

*.qml

    ColumnLayout {
        id: printersColumn
        width: parent.width
        spacing: 8
        Layout.bottomMargin: 8
        Layout.topMargin: 8

        visible: !netlib.discoveryInProgress

        RowLayout {
            width: parent.width

            ComboBox {
                id: printers
                width: parent.width
                anchors.margins: 4
                textRole: "name"
            }

            Connections {
                target: netlib
                onDiscoveryResultChanged: {
                    printers.model = jsonArray // ComboBox model is set to QJsonArray
                }
            }
        }

        RowLayout {
            TextArea {
                text: printers.currentText
                // How to access `printers` ComboBox data model here?
                // I need to access key/values of QJsonArray ... how?
            }
        }

    }

样本QJsonArray是

QJsonArray([{"ip":"10.10.2.22","name":"N 0","port":4000,"profiles_array":[{"config":"0 blah blah blah","id":0,"name":"Profile 0-0"},{"config":"1 blah blah blah","id":1,"name":"Profile 0-1"},{"config":"2 blah blah blah","id":2,"name":"Profile 0-2"}]},{"ip":"192.168.1.1","name":"N 1","port":4001,"profiles_array":[{"config":"0 blah blah blah","id":0,"name":"Profile 1-0"},{"config":"1 blah blah blah","id": 1,"name":"Profile 1-1"},{"config":"2 blah blah blah","id":2,"name":"Profile 1-2"}] },{"ip":"172.16.1.1","name":"N 2","port":4003,"profiles_array":[{"config":" 0 等等等等等等","id":0,"name":"Profile 2-0"},{"config":"1 等等等等等等","id":1,"name":"Profile 2-1"},{"config":"2 blah blah blah","id":2,"name":"Profile 2-2"}]}])

如何从我的 QML 代码的 TextArea 中访问 ComboBox 模型 QJsonArray 的 key/values？

Answer 1

这样，我可以从我的 TextArea:

中访问 ID 为 printers 的 ComboBox 的 JsonArray 模型 key/values

 TextArea {
     text: "Printer IP: " + printers.model[printers.currentIndex].ip +
         "\nPrinter Port: " + printers.model[printers.currentIndex].port
 }

访问组合框数据模型

Accessing combo box data model

qt

combobox

qml

qjson