QML-将Javascript关联数组传递给C ++

Question

In my app I have a class which registered as singleton for QML . My purpose is collecting values in QML as associative array and passing this array to C++ . This is the simplified version of the class:

class Config : public QObject
{
Q_OBJECT
private:
  Config(QObject *parent = 0);
public:
  static Config *instance();
  ~Config();
  Q_INVOKABLE void sendValue (const QVariantMap &map) {
    qWarning() << map.size();
  }
}

and here I register an instance of the class as singleton:

qmlRegisterSingletonType<Config>("myNS", 1, 0, "Config", config_singletontype_provider);

In some place in QML file I try to pass javascript array back to c++;

function sendValue() {
  var arr = [];
  arr["key"] = "value";
  Config.sendValue(arr);      
}

But nothing passed. The map.size() in C++ returns 0. May be I need some additional conversion?

Answer 1

好吧，我回答我自己的问题）的文档不是那么清楚，但是，据我了解， Qt JS数组转换为QVariantList和JS对象 QVariantMap所以在我来说，我只需要创建一个对象，而不是数组：

var arr = {};