Qt:QtQuick:DECLARATIVE_EXAMPLE_MAIN

逃离我推掉我的手 2022-07-12 11:58 163阅读 0赞

![这里写图片描述][SouthEast]

在官方示例工程里大多会看到这样的代码，没有main启动函数

#include "../../shared/shared.h"
    DECLARATIVE_EXAMPLE_MAIN(demos/stocqt/stocqt)

其实不是，DECLARATIVE\_EXAMPLE\_MAIN 封装了启动过程，看看这个宏定义

#include <QDir>
    #include <QGuiApplication>
    #include <QQmlEngine>
    #include <QQmlFileSelector>
    #include <QQuickView> //Not using QQmlApplicationEngine because many examples don't have a Window{}
    #define DECLARATIVE_EXAMPLE_MAIN(NAME) int main(int argc, char* argv[]) \
    {\
        QGuiApplication app(argc,argv);\
        app.setOrganizationName("QtProject");\
        app.setOrganizationDomain("qt-project.org");\
        app.setApplicationName(QFileInfo(app.applicationFilePath()).baseName());\
        QQuickView view;\
        if (qgetenv("QT_QUICK_CORE_PROFILE").toInt()) {\
            QSurfaceFormat f = view.format();\
            f.setProfile(QSurfaceFormat::CoreProfile);\
            f.setVersion(4, 4);\
            view.setFormat(f);\
        }\
        view.connect(view.engine(), &QQmlEngine::quit, &app, &QCoreApplication::quit);\
        new QQmlFileSelector(view.engine(), &view);\
        view.setSource(QUrl("qrc:///" #NAME ".qml")); \
        if (view.status() == QQuickView::Error)\
            return -1;\
        view.setResizeMode(QQuickView::SizeRootObjectToView);\
        if (QGuiApplication::platformName() == QLatin1String("qnx") || \
              QGuiApplication::platformName() == QLatin1String("eglfs")) {\
            view.showFullScreen();\
        } else {\
            view.show();\
        }\
        return app.exec();\
    }

可以看到里面就是一个完整的启动过程，qrc:///” \#NAME “.qml” 这段代码把demos/stocqt/stocqt组合为 qrc:///qmldemos/stocqt/stocqt.qml

[SouthEast]: /images/20220710/5e33dc35aa1c45109dfd75b529cf5c4a.png