#QMLFirst
一个简单的图片展示程序主要练习C++与QMl混合编程（QML中使用c++类）
注意到的事情： d当QML想使用在C ++中定义的内容，比如方法要用Q_INVOKABLE修饰，枚举要用Q_MENUMS修饰，但是当我在用信号中传递一个我定义的枚举值时，报了一个未定义的错误，当时我是使用Q_EMNUMS的，后来我导出成qRegisterMetaType （“Handletype”）;（前面的是c++中你要导出的Metatype，后面（“Handletype”），是你qml要用的东西）就解决了，而且导导成这个之后，不写Q_EMNUMS没事，我不明白原理，现在只是单纯的记录 -2019/7/28
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