C++ QMetaMethod::returnType方法代码示例

void Bindable::checkReturnType(const QMetaMethod &method, const int typeId)
{
	Q_ASSERT_X(typeId != QMetaType::UnknownType, "Bindable::wait",
			   "Requested return type is not registered, please use the Q_DECLARE_METATYPE "
			   "macro to make it known to Qt's meta-object system");
	Q_ASSERT_X(
		method.returnType() == typeId ||
			QMetaType::hasRegisteredConverterFunction(method.returnType(), typeId),
		"Bindable::wait",
		qPrintable(
			QString("Requested return type (%1) is incompatible method return type (%2)")
				.arg(QMetaType::typeName(typeId), QMetaType::typeName(method.returnType()))));
}

// Creates a string, describing an object, using meta-object introspection
QString objToString(const QObject *obj) {
    QStringList result;
    const QMetaObject *meta = obj->metaObject();
    result += QString("class %1 : public %2 {").arg(meta->className())
            .arg(meta->superClass()->className());
    for (auto i=0; i < meta->propertyCount(); ++i) {
        const QMetaProperty property = meta->property(i);
        QVariant value = obj->property(property.name());
        if (value.canConvert(QVariant::String))
            result += QString("  %1 %2 = %3;")
                    .arg(property.typeName())
                    .arg(property.name())
                    .arg(value.toString());
    }

    QString signalPrefix("");
    for (auto i=0; i < meta->methodCount(); ++i) {
        const QMetaMethod method = meta->method(i);
        const QMetaMethod::MethodType methodType = method.methodType();
        if (methodType == QMetaMethod::Signal)
            signalPrefix = QStringLiteral("Q_SIGNAL");
        else if (methodType == QMetaMethod::Slot)
            signalPrefix = QStringLiteral("Q_SLOT");
        result += QString("  %1 %2 %3;")
                .arg(signalPrefix)
                .arg(QVariant::typeToName(method.returnType()))
                .arg(QString(method.methodSignature()));
    }
    result += "};";
    return result.join("\n");
}

void QDeclarativePropertyCache::Data::load(const QMetaMethod &m)
{
    coreIndex = m.methodIndex();
    relatedIndex = -1;
    flags |= Data::IsFunction;
    if (m.methodType() == QMetaMethod::Signal)
        flags |= Data::IsSignal;
    propType = m.returnType();

    QList<QByteArray> params = m.parameterTypes();
    if (!params.isEmpty())
        flags |= Data::HasArguments;
    revision = m.revision();
}

error *objectInvoke(QObject_ *object, const char *method, int methodLen, DataValue *resultdv, DataValue *paramsdv, int paramsLen)
{
    QObject *qobject = reinterpret_cast<QObject *>(object);

    QVariant result;
    QVariant param[MaxParams];
    QGenericArgument arg[MaxParams];
    for (int i = 0; i < paramsLen; i++) {
        unpackDataValue(&paramsdv[i], &param[i]);
        arg[i] = Q_ARG(QVariant, param[i]);
    }
    if (paramsLen > 10) {
        panicf("fix the parameter dispatching");
    }

    const QMetaObject *metaObject = qobject->metaObject();
    // Walk backwards so descendants have priority.
    for (int i = metaObject->methodCount()-1; i >= 0; i--) {
        QMetaMethod metaMethod = metaObject->method(i);
        QMetaMethod::MethodType methodType = metaMethod.methodType();
        if (methodType == QMetaMethod::Method || methodType == QMetaMethod::Slot) {
            QByteArray name = metaMethod.name();
            if (name.length() == methodLen && qstrncmp(name.constData(), method, methodLen) == 0) {
                if (metaMethod.parameterCount() < paramsLen) {
                    // TODO Might continue looking to see if a different signal has the same name and enough arguments.
                    return errorf("method \"%s\" has too few parameters for provided arguments", method);
                }

                bool ok;
                if (metaMethod.returnType() == QMetaType::Void) {
                    ok = metaMethod.invoke(qobject, Qt::DirectConnection, 
                        arg[0], arg[1], arg[2], arg[3], arg[4], arg[5], arg[6], arg[7], arg[8], arg[9]);
                } else {
                    ok = metaMethod.invoke(qobject, Qt::DirectConnection, Q_RETURN_ARG(QVariant, result),
                        arg[0], arg[1], arg[2], arg[3], arg[4], arg[5], arg[6], arg[7], arg[8], arg[9]);
                }
                if (!ok) {
                    return errorf("invalid parameters to method \"%s\"", method);
                }

                packDataValue(&result, resultdv);
                return 0;
            }
        }
    }

    return errorf("object does not expose a method \"%s\"", method);
}

void Nuria::ObjectWrapperResourcePrivate::addMethodToPropertyList (QMetaMethod method, Method &descriptor) {
	Nuria::Resource::Property::Type type = (method.methodType () == QMetaMethod::Signal)
	                                       ? Nuria::Resource::Property::Signal
	                                       : Nuria::Resource::Property::Slot;
	QString name = QString::fromLatin1 (method.name ());
	int resultType = method.returnType ();
	Nuria::Resource::ArgumentTypeMap args;
	
	// Convert descriptor to argument type map
	for (int i = 0; i < descriptor.names.length (); i++) {
		args.insert (descriptor.names.at (i), descriptor.types.at (i));
	}
	
	// Add to list
	descriptor.propertyIndex = this->propertyList.length ();
	this->propertyList.append (Nuria::Resource::Property (type, name, args, resultType));
	
}

void tst_QQmlMetaObject::method()
{
    QFETCH(QString, testFile);
    QFETCH(QString, signature);
    QFETCH(QMetaMethod::MethodType, methodType);
    QFETCH(int, returnType);
    QFETCH(QString, returnTypeName);
    QFETCH(QList<int>, parameterTypes);
    QFETCH(QList<QByteArray>, parameterTypeNames);
    QFETCH(QList<QByteArray>, parameterNames);

    QCOMPARE(parameterTypes.size(), parameterTypeNames.size());
    QCOMPARE(parameterTypeNames.size(), parameterNames.size());

    QQmlEngine engine;
    QQmlComponent component(&engine, testFileUrl(testFile));
    QObject *object = component.create();
    QVERIFY(object != 0);

    const QMetaObject *mo = object->metaObject();
    QVERIFY(mo->superClass() != 0);
    QVERIFY(QByteArray(mo->className()).contains("_QML_"));
    QCOMPARE(mo->methodOffset(), mo->superClass()->methodCount());
    QCOMPARE(mo->methodCount(), mo->superClass()->methodCount() + 1);

    QMetaMethod method = mo->method(mo->methodOffset());
    QCOMPARE(method.methodType(), methodType);
    QCOMPARE(QString::fromUtf8(method.methodSignature().constData()), signature);
    QCOMPARE(method.access(), QMetaMethod::Public);

    QString computedName = signature.left(signature.indexOf('('));
    QCOMPARE(QString::fromUtf8(method.name()), computedName);

    QCOMPARE(method.parameterCount(), parameterTypes.size());
    for (int i = 0; i < parameterTypes.size(); ++i)
        QCOMPARE(method.parameterType(i), parameterTypes.at(i));
    QCOMPARE(method.parameterTypes(), parameterTypeNames);
    QCOMPARE(method.tag(), "");

    QCOMPARE(QString::fromUtf8(method.typeName()), returnTypeName);
    QCOMPARE(method.returnType(), returnType);

    delete object;
}

void QObjectHandler::process(QHttpSocket *socket, const QString &path)
{
    // Only POST requests are accepted - reject any other methods but ensure
    // that the Allow header is set in order to comply with RFC 2616
    if(socket->method() != "POST") {
        socket->setHeader("Allow", "POST");
        socket->writeError(QHttpSocket::MethodNotAllowed);
        return;
    }

    // Determine the index of the slot with the specified name - note that we
    // don't need to worry about retrieving the index for deleteLater() since
    // we specify the "QVariantMap" parameter type, which no parent slots use
    int index = metaObject()->indexOfSlot(QString("%1(QVariantMap)").arg(path).toUtf8().data());

    // If the index is invalid, the "resource" was not found
    if(index == -1) {
        socket->writeError(QHttpSocket::NotFound);
        return;
    }

    // Ensure that the return type of the slot is QVariantMap
    QMetaMethod method = metaObject()->method(index);
    if(method.returnType() != QMetaType::QVariantMap) {
        socket->writeError(QHttpSocket::InternalServerError);
        return;
    }

    // Check to see if the socket has finished receiving all of the data yet
    // or not - if so, jump to invokeSlot(), otherwise wait for the
    // readChannelFinished() signal
    if(socket->bytesAvailable() >= socket->contentLength()) {
        d->invokeSlot(socket, index);
    } else {

        // Add the socket and index to the map so that the latter can be
        // retrieved when the readChannelFinished() signal is emitted
        d->map.insert(socket, index);
        connect(socket, SIGNAL(readChannelFinished()), d, SLOT(onReadChannelFinished()));
    }
}

void tst_QMetaMethod::method()
{
    QFETCH(QByteArray, signature);
    QFETCH(int, returnType);
    QFETCH(QByteArray, returnTypeName);
    QFETCH(QList<int>, parameterTypes);
    QFETCH(QList<QByteArray>, parameterTypeNames);
    QFETCH(QList<QByteArray>, parameterNames);
    QFETCH(QMetaMethod::MethodType, methodType);
    QFETCH(QMetaMethod::Access, access);

    QVERIFY(parameterTypes.size() == parameterTypeNames.size());
    QVERIFY(parameterTypes.size() == parameterNames.size());

    const QMetaObject *mo = &MethodTestObject::staticMetaObject;
    int index = (methodType == QMetaMethod::Constructor)
                ? mo->indexOfConstructor(signature) : mo->indexOfMethod(signature);
    QVERIFY(index != -1);
    QMetaMethod method = (methodType == QMetaMethod::Constructor)
                         ? mo->constructor(index) : mo->method(index);
    QVERIFY(method.isValid());
    QCOMPARE(method.methodType(), methodType);
    QCOMPARE(method.access(), access);

    QVERIFY(!method.methodSignature().isEmpty());
    if (method.methodSignature() != signature) {
        // QMetaMethod should always produce a semantically equivalent signature
        int signatureIndex = (methodType == QMetaMethod::Constructor)
                ? mo->indexOfConstructor(method.methodSignature())
                : mo->indexOfMethod(method.methodSignature());
        QCOMPARE(signatureIndex, index);
    }

    QByteArray computedName = signature.left(signature.indexOf('('));
    QCOMPARE(method.name(), computedName);

    QCOMPARE(method.tag(), "");
    QCOMPARE(method.returnType(), returnType);
    QVERIFY(method.typeName() != 0);
    if (QByteArray(method.typeName()) != returnTypeName) {
        // QMetaMethod should always produce a semantically equivalent typename
        QCOMPARE(QMetaType::type(method.typeName()), QMetaType::type(returnTypeName));
    }

    if (method.parameterTypes() != parameterTypeNames) {
        // QMetaMethod should always produce semantically equivalent typenames
        QList<QByteArray> actualTypeNames = method.parameterTypes();
        QCOMPARE(actualTypeNames.size(), parameterTypeNames.size());
        for (int i = 0; i < parameterTypeNames.size(); ++i) {
            QCOMPARE(QMetaType::type(actualTypeNames.at(i)),
                     QMetaType::type(parameterTypeNames.at(i)));
        }
    }
    QCOMPARE(method.parameterNames(), parameterNames);

    QCOMPARE(method.parameterCount(), parameterTypes.size());
    for (int i = 0; i < parameterTypes.size(); ++i)
        QCOMPARE(method.parameterType(i), parameterTypes.at(i));

    {
        QVector<int> actualParameterTypes(parameterTypes.size());
        method.getParameterTypes(actualParameterTypes.data());
        for (int i = 0; i < parameterTypes.size(); ++i)
            QCOMPARE(actualParameterTypes.at(i), parameterTypes.at(i));
    }

    // Bogus indexes
    QCOMPARE(method.parameterType(-1), 0);
    QCOMPARE(method.parameterType(parameterTypes.size()), 0);
}

static QString generateInterfaceXml(const QMetaObject *mo, int flags, int methodOffset, int propOffset)
{
    QString retval;

    // start with properties:
    if (flags & (QDBusConnection::ExportScriptableProperties |
                 QDBusConnection::ExportNonScriptableProperties)) {
        for (int i = propOffset; i < mo->propertyCount(); ++i) {
            static const char *accessvalues[] = {0, "read", "write", "readwrite"};

            QMetaProperty mp = mo->property(i);

            if (!((mp.isScriptable() && (flags & QDBusConnection::ExportScriptableProperties)) ||
                  (!mp.isScriptable() && (flags & QDBusConnection::ExportNonScriptableProperties))))
                continue;

            int access = 0;
            if (mp.isReadable())
                access |= 1;
            if (mp.isWritable())
                access |= 2;

            int typeId = mp.userType();
            if (!typeId)
                continue;
            const char *signature = QDBusMetaType::typeToSignature(typeId);
            if (!signature)
                continue;

            retval += QString::fromLatin1("    <property name=\"%1\" type=\"%2\" access=\"%3\"")
                      .arg(QLatin1String(mp.name()))
                      .arg(QLatin1String(signature))
                      .arg(QLatin1String(accessvalues[access]));

            if (QDBusMetaType::signatureToType(signature) == QVariant::Invalid) {
                const char *typeName = QMetaType::typeName(typeId);
                retval += QString::fromLatin1(">\n      <annotation name=\"org.qtproject.QtDBus.QtTypeName\" value=\"%3\"/>\n    </property>\n")
                          .arg(typeNameToXml(typeName));
            } else {
                retval += QLatin1String("/>\n");
            }
        }
    }

    // now add methods:
    for (int i = methodOffset; i < mo->methodCount(); ++i) {
        QMetaMethod mm = mo->method(i);

        bool isSignal;
        if (mm.methodType() == QMetaMethod::Signal)
            // adding a signal
            isSignal = true;
        else if (mm.access() == QMetaMethod::Public && (mm.methodType() == QMetaMethod::Slot || mm.methodType() == QMetaMethod::Method))
            isSignal = false;
        else
            continue;           // neither signal nor public slot

        if (isSignal && !(flags & (QDBusConnection::ExportScriptableSignals |
                                   QDBusConnection::ExportNonScriptableSignals)))
            continue;           // we're not exporting any signals
        if (!isSignal && (!(flags & (QDBusConnection::ExportScriptableSlots | QDBusConnection::ExportNonScriptableSlots)) &&
                          !(flags & (QDBusConnection::ExportScriptableInvokables | QDBusConnection::ExportNonScriptableInvokables))))
            continue;           // we're not exporting any slots or invokables

        QString xml = QString::fromLatin1("    <%1 name=\"%2\">\n")
                      .arg(isSignal ? QLatin1String("signal") : QLatin1String("method"))
                      .arg(QString::fromLatin1(mm.name()));

        // check the return type first
        int typeId = mm.returnType();
        if (typeId != QMetaType::UnknownType && typeId != QMetaType::Void) {
            const char *typeName = QDBusMetaType::typeToSignature(typeId);
            if (typeName) {
                xml += QString::fromLatin1("      <arg type=\"%1\" direction=\"out\"/>\n")
                       .arg(typeNameToXml(typeName));

                // do we need to describe this argument?
                if (QDBusMetaType::signatureToType(typeName) == QVariant::Invalid)
                    xml += QString::fromLatin1("      <annotation name=\"org.qtproject.QtDBus.QtTypeName.Out0\" value=\"%1\"/>\n")
                        .arg(typeNameToXml(QMetaType::typeName(typeId)));
            } else {
                qWarning() << "Unsupported return type" << typeId << QMetaType::typeName(typeId) << "in method" << mm.name();
                continue;
            }
        }
        else if (typeId == QMetaType::UnknownType) {
            qWarning() << "Invalid return type in method" << mm.name();
            continue;           // wasn't a valid type
        }

        QList<QByteArray> names = mm.parameterNames();
        QVector<int> types;
        QString errorMsg;
        int inputCount = qDBusParametersForMethod(mm, types, errorMsg);
        if (inputCount == -1) {
            qWarning() << "Skipped method" << mm.name() << ":" << qPrintable(errorMsg);
            continue;           // invalid form
        }
        if (isSignal && inputCount + 1 != types.count())
            continue;           // signal with output arguments?
//.........这里部分代码省略.........

int QServiceProxy::qt_metacall(QMetaObject::Call c, int id, void **a)
{
    id = QServiceProxyBase::qt_metacall(c, id, a);
    if (id < 0 || !d->meta)
        return id;

    if (c == QMetaObject::InvokeMetaMethod) {

        const int mcount = d->meta->methodCount() - d->meta->methodOffset();
        const int metaIndex = id + d->meta->methodOffset();

        QMetaMethod method = d->meta->method(metaIndex);

        const int returnType = method.returnType();

        //process arguments
        const QList<QByteArray> pTypes = method.parameterTypes();
        const int pTypesCount = pTypes.count();
        QVariantList args ;
        if (pTypesCount > 10) {
            qWarning() << "Cannot call" << method.methodSignature() << ". More than 10 parameter.";
            return id;
        }
        for (int i=0; i < pTypesCount; i++) {
            const QByteArray& t = pTypes[i];

            int variantType = QMetaType::type(t);

            if (variantType == QMetaType::QVariant) {  //ignore whether QVariant is declared as metatype
                args << *reinterpret_cast<const QVariant(*)>(a[i+1]);
            } else if ( variantType == 0 ){
                qWarning("%s: argument %s has unknown type. Use qRegisterMetaType to register it.",
                        method.methodSignature().constData(), t.data());
                return id;
            } else {
                args << QVariant(variantType, a[i+1]);
            }
        }

        if (returnType == QMetaType::Void) {

            qServiceLog() << "event" << "nonblocking void call"
                          << "method" << QString::fromLatin1(method.methodSignature())
                          << "endpoint" << d->endPoint->objectName();

            d->endPoint->invokeRemote(d->localToRemote[metaIndex], args, returnType);
        } else {
            //TODO: invokeRemote() parameter list needs review

            qServiceLog() << "event" << "nonblocking call"
                          << "method" << QString::fromLatin1(method.methodSignature())
                          << "endpoint" << d->endPoint->objectName();

            QVariant result = d->endPoint->invokeRemote(d->localToRemote[metaIndex], args, returnType);
            if (result.type() != QVariant::Invalid){
                if (returnType != QMetaType::QVariant) {
                    QByteArray buffer;
                    QDataStream stream(&buffer, QIODevice::ReadWrite);
                    QMetaType::save(stream, returnType, result.constData());
                    stream.device()->seek(0);
                    QMetaType::load(stream, returnType, a[0]);
                } else {
                    if (a[0]) *reinterpret_cast< QVariant*>(a[0]) = result;
                }
            }
        }
        id-=mcount;
    } else if ( c == QMetaObject::ReadProperty
            || c == QMetaObject::WriteProperty
            || c == QMetaObject::ResetProperty ) {
        const int pCount = d->meta->propertyCount() - d->meta->propertyOffset();
        const int metaIndex = id + d->meta->propertyOffset();
        QMetaProperty property = d->meta->property(metaIndex);
        if (property.isValid()) {
            int pType = property.userType();

            QVariant arg;
            if ( c == QMetaObject::WriteProperty ) {

                qServiceLog() << "event" << "property write"
                              << "property" << property.name()
                              << "endpoint" << d->endPoint->objectName();

                if (pType == QMetaType::QVariant)
                    arg =  *reinterpret_cast<const QVariant(*)>(a[0]);
                else if (pType == 0) {
                    qWarning("%s: property %s has unkown type", property.name(), property.typeName());
                    return id;
                } else {
                    arg = QVariant(pType, a[0]);
                }
            }
            QVariant result;
            if (c == QMetaObject::ReadProperty) {

                qServiceLog() << "event" << "property read"
                              << "property" << property.name()
                              << "endpoint" << d->endPoint->objectName();

                result = d->endPoint->invokeRemoteProperty(metaIndex, arg, pType, c);
//.........这里部分代码省略.........

void tst_QQmlMetaObject::property()
{
    QFETCH(QString, testFile);
    QFETCH(QByteArray, cppTypeName);
    QFETCH(int, cppType);
    QFETCH(bool, isDefault);
    QFETCH(QVariant, expectedValue);
    QFETCH(bool, isWritable);
    QFETCH(QVariant, newValue);

    QQmlEngine engine;
    QQmlComponent component(&engine, testFileUrl(testFile));
    QObject *object = component.create();
    QVERIFY(object != 0);

    const QMetaObject *mo = object->metaObject();
    QVERIFY(mo->superClass() != 0);
    QVERIFY(QByteArray(mo->className()).contains("_QML_"));
    QCOMPARE(mo->propertyOffset(), mo->superClass()->propertyCount());
    QCOMPARE(mo->propertyCount(), mo->superClass()->propertyCount() + 1);

    QMetaProperty prop = mo->property(mo->propertyOffset());
    QCOMPARE(prop.name(), "test");

    QCOMPARE(QByteArray(prop.typeName()), cppTypeName);
    if (prop.userType() < QMetaType::User)
        QCOMPARE(prop.type(), QVariant::Type(cppType));
    else
        QCOMPARE(prop.type(), QVariant::UserType);
    QCOMPARE(prop.userType(), cppType);

    QVERIFY(!prop.isConstant());
    QVERIFY(!prop.isDesignable());
    QVERIFY(!prop.isEnumType());
    QVERIFY(!prop.isFinal());
    QVERIFY(!prop.isFlagType());
    QVERIFY(prop.isReadable());
    QVERIFY(!prop.isResettable());
    QVERIFY(prop.isScriptable());
    QVERIFY(!prop.isStored());
    QVERIFY(!prop.isUser());
    QVERIFY(prop.isValid());
    QCOMPARE(prop.isWritable(), isWritable);

    QCOMPARE(mo->classInfoOffset(), mo->superClass()->classInfoCount());
    QCOMPARE(mo->classInfoCount(), mo->superClass()->classInfoCount() + (isDefault ? 1 : 0));
    if (isDefault) {
        QMetaClassInfo info = mo->classInfo(mo->classInfoOffset());
        QCOMPARE(info.name(), "DefaultProperty");
        QCOMPARE(info.value(), "test");
    }

    QCOMPARE(mo->methodOffset(), mo->superClass()->methodCount());
    QCOMPARE(mo->methodCount(), mo->superClass()->methodCount() + 1); // the signal

    QVERIFY(prop.notifySignalIndex() != -1);
    QMetaMethod signal = prop.notifySignal();
    QCOMPARE(signal.methodType(), QMetaMethod::Signal);
    QCOMPARE(signal.name(), QByteArray("testChanged"));
    QCOMPARE(signal.methodSignature(), QByteArray("testChanged()"));
    QCOMPARE(signal.access(), QMetaMethod::Public);
    QCOMPARE(signal.parameterCount(), 0);
    QCOMPARE(signal.parameterTypes(), QList<QByteArray>());
    QCOMPARE(signal.parameterNames(), QList<QByteArray>());
    QCOMPARE(signal.tag(), "");
    QCOMPARE(signal.typeName(), "void");
    QCOMPARE(signal.returnType(), int(QMetaType::Void));

    QSignalSpy changedSpy(object, SIGNAL(testChanged()));
    QObject::connect(object, SIGNAL(testChanged()), object, SLOT(deleteLater()));

    if (expectedValue.isValid())
        QCOMPARE(prop.read(object), expectedValue);
    else
        QVERIFY(prop.read(object).isValid());
    QCOMPARE(changedSpy.count(), 0);

    if (isWritable) {
        QVERIFY(prop.write(object, newValue));
        QCOMPARE(changedSpy.count(), 1);
        QCOMPARE(prop.read(object), newValue);
    } else {
        QVERIFY(!prop.write(object, prop.read(object)));
        QCOMPARE(changedSpy.count(), 0);
    }

    delete object;
}