Question

我正在将C ++类注册为QML单例，并尝试从JS调用此单例的方法。我收到此错误消息：

TypeError：对象[object Object]的属性'readAll'不是函数

我的代码：

main.cpp （只需注册单身，由书籍完成）：

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include "fileio.h"

static QObject* fileIOSingletonTypeProvider(QQmlEngine *engine, QJSEngine *scriptEngine)
{
    Q_UNUSED(engine)
    Q_UNUSED(scriptEngine)

    FileIO* example = new FileIO();
    return example;
}

static void registerQmlTypes()
{
    qmlRegisterSingletonType<FileIO>("FileIO", 1, 0, "FileIO", fileIOSingletonTypeProvider);
}


int main(int argc, char *argv[])
{
    registerQmlTypes();
    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    return app.exec();
}

fileio.cpp ：

#include "fileio.h"

FileIO::FileIO(QObject *parent) :
    QObject(parent)
{
}

void FileIO::readAll()
{
}

fileio.h ：

#ifndef FILEIO_H
#define FILEIO_H

#include <QObject>

class FileIO : public QObject
{
    Q_OBJECT

public:
    explicit FileIO(QObject *parent = 0);

    Q_INVOKABLE void readAll();
};

#endif // FILEIO_H

main.qml ：

import QtQuick 2.5
import QtQuick.Window 2.2
import "test.js" as Code

Window {
    visible: true

    Component.onCompleted: {
        Code.func();
    }
}

test.js ：

.import FileIO 1.0 as FileIO

function func() {
    FileIO.readAll();
}

Answer 1

我找到了答案here。虽然它们指的是从QML导入而我指的是从JS导入，但解决方案是相同的，即：

将方法调用为FileIO.FileIO.readAll()或从as FileIO语句中删除.import。

docs并未明显提及需要加倍FileIO限定符，也未提及删除as FileIO的可能性。{p>我reported a documentation bug to Qt。

在JS中调用C ++单例对象的方法产生“对象[object object]的TypeError：Property'foo'不是函数”

1 个答案: