/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the QtDBus module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 3 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL3 included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 3 requirements ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 2.0 or (at your option) the GNU General ** Public license version 3 or any later version approved by the KDE Free ** Qt Foundation. The licenses are as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 ** included in the packaging of this file. Please review the following ** information to ensure the GNU General Public License requirements will ** be met: https://www.gnu.org/licenses/gpl-2.0.html and ** https://www.gnu.org/licenses/gpl-3.0.html. ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "qdbusreply.h" #include "qdbusmetatype.h" #include "qdbusmetatype_p.h" #include #ifndef QT_NO_DBUS QT_BEGIN_NAMESPACE /*! \class QDBusReply \inmodule QtDBus \since 4.2 \brief The QDBusReply class stores the reply for a method call to a remote object. A QDBusReply object is a subset of the QDBusMessage object that represents a method call's reply. It contains only the first output argument or the error code and is used by QDBusInterface-derived classes to allow returning the error code as the function's return argument. It can be used in the following manner: \snippet code/src_qdbus_qdbusreply.cpp 0 If the remote method call cannot fail, you can skip the error checking: \snippet code/src_qdbus_qdbusreply.cpp 1 However, if it does fail under those conditions, the value returned by QDBusReply::value() is a default-constructed value. It may be indistinguishable from a valid return value. QDBusReply objects are used for remote calls that have no output arguments or return values (i.e., they have a "void" return type). Use the isValid() function to test if the reply succeeded. \sa QDBusMessage, QDBusInterface */ /*! \fn template QDBusReply::QDBusReply(const QDBusMessage &reply) Automatically construct a QDBusReply object from the reply message \a reply, extracting the first return value from it if it is a success reply. */ /*! \fn template QDBusReply::QDBusReply(const QDBusPendingReply &reply) Constructs a QDBusReply object from the pending reply message, \a reply. */ /*! \fn template QDBusReply::QDBusReply(const QDBusPendingCall &pcall) Automatically construct a QDBusReply object from the asynchronous pending call \a pcall. If the call isn't finished yet, QDBusReply will call QDBusPendingCall::waitForFinished(), which is a blocking operation. If the return types patch, QDBusReply will extract the first return argument from the reply. */ /*! \fn template QDBusReply::QDBusReply(const QDBusError &error) Constructs an error reply from the D-Bus error code given by \a error. */ /*! \fn template QDBusReply::operator=(const QDBusReply &other) Makes this object be a copy of the object \a other. */ /*! \fn template QDBusReply::operator=(const QDBusError &dbusError) Sets this object to contain the error code given by \a dbusError. You can later access it with error(). */ /*! \fn template QDBusReply::operator=(const QDBusMessage &reply) Makes this object contain the \a reply message. If \a reply is an error message, this function will copy the error code and message into this object If \a reply is a standard reply message and contains at least one parameter, it will be copied into this object, as long as it is of the correct type. If it's not of the same type as this QDBusError object, this function will instead set an error code indicating a type mismatch. */ /*! \fn template QDBusReply::operator=(const QDBusPendingCall &pcall) Makes this object contain the reply specified by the pending asynchronous call \a pcall. If the call is not finished yet, this function will call QDBusPendingCall::waitForFinished() to block until the reply arrives. If \a pcall finishes with an error message, this function will copy the error code and message into this object If \a pcall finished with a standard reply message and contains at least one parameter, it will be copied into this object, as long as it is of the correct type. If it's not of the same type as this QDBusError object, this function will instead set an error code indicating a type mismatch. */ /*! \fn template bool QDBusReply::isValid() const Returns \c true if no error occurred; otherwise, returns \c false. \sa error() */ /*! \fn template const QDBusError& QDBusReply::error() const Returns the error code that was returned from the remote function call. If the remote call did not return an error (i.e., if it succeeded), then the QDBusError object that is returned will not be a valid error code (QDBusError::isValid() will return false). \sa isValid() */ /*! \fn template const QDBusError& QDBusReply::error() \overload */ /*! \fn template QDBusReply::value() const Returns the remote function's calls return value. If the remote call returned with an error, the return value of this function is undefined and may be undistinguishable from a valid return value. This function is not available if the remote call returns \c void. */ /*! \fn template QDBusReply::operator Type() const Returns the same as value(). This function is not available if the remote call returns \c void. */ /*! \internal Fills in the QDBusReply data \a error and \a data from the reply message \a reply. */ void qDBusReplyFill(const QDBusMessage &reply, QDBusError &error, QVariant &data) { error = QDBusError(reply); if (error.isValid()) { data = QVariant(); // clear it return; } if (reply.arguments().count() >= 1 && reply.arguments().at(0).userType() == data.userType()) { data = reply.arguments().at(0); return; } const char *expectedSignature = QDBusMetaType::typeToSignature(data.userType()); const char *receivedType = nullptr; QByteArray receivedSignature; if (reply.arguments().count() >= 1) { if (reply.arguments().at(0).userType() == QDBusMetaTypeId::argument()) { // compare signatures instead QDBusArgument arg = qvariant_cast(reply.arguments().at(0)); receivedSignature = arg.currentSignature().toLatin1(); if (receivedSignature == expectedSignature) { // matched. Demarshall it QDBusMetaType::demarshall(arg, data.userType(), data.data()); return; } } else { // not an argument and doesn't match? int type = reply.arguments().at(0).userType(); receivedType = QMetaType::typeName(type); receivedSignature = QDBusMetaType::typeToSignature(type); } } // error if (receivedSignature.isEmpty()) receivedSignature = ""; QString errorMsg; if (receivedType) { errorMsg = QLatin1String("Unexpected reply signature: got \"%1\" (%4), " "expected \"%2\" (%3)") .arg(QLatin1String(receivedSignature), QLatin1String(expectedSignature), QLatin1String(data.typeName()), QLatin1String(receivedType)); } else { errorMsg = QLatin1String("Unexpected reply signature: got \"%1\", " "expected \"%2\" (%3)") .arg(QLatin1String(receivedSignature), QLatin1String(expectedSignature), QLatin1String(data.typeName())); } error = QDBusError(QDBusError::InvalidSignature, errorMsg); data = QVariant(); // clear it } QT_END_NAMESPACE #endif // QT_NO_DBUS