qt-everywhere-src-5.14.1/qtbase/src/plugins/printsupport/cocoa/main.cpp

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#include <QtCore/QMetaMethod>
#include <QtGui/QGuiApplication>
#include <qpa/qplatformnativeinterface.h>
#include <qpa/qplatformprintplugin.h>

QT_BEGIN_NAMESPACE

class QCocoaPrinterSupportPlugin : public QPlatformPrinterSupportPlugin
{
    Q_OBJECT
    Q_PLUGIN_METADATA(IID QPlatformPrinterSupportFactoryInterface_iid FILE "cocoa.json")

public:
    QPlatformPrinterSupport *create(const QString &);
};

QPlatformPrinterSupport *QCocoaPrinterSupportPlugin::create(const QString &key)
{
    if (key.compare(key, QLatin1String("cocoaprintersupport"), Qt::CaseInsensitive) != 0)
        return 0;
    QGuiApplication *app = qobject_cast<QGuiApplication *>(QCoreApplication::instance());
    if (!app)
        return 0;
    QPlatformNativeInterface *platformNativeInterface = app->platformNativeInterface();
    int at = platformNativeInterface->metaObject()->indexOfMethod("createPlatformPrinterSupport()");
    if (at == -1)
        return 0;
    QMetaMethod createPlatformPrinterSupport = platformNativeInterface->metaObject()->method(at);
    QPlatformPrinterSupport *platformPrinterSupport = 0;
    if (!createPlatformPrinterSupport.invoke(platformNativeInterface, Q_RETURN_ARG(QPlatformPrinterSupport *, platformPrinterSupport)))
        return 0;
    return platformPrinterSupport;
}

QT_END_NAMESPACE

#include "main.moc"