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/****************************************************************************
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/
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** This file is part of the QtQml module of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL$
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** GNU Lesser General Public License Usage
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** This file may be used under the terms of the GNU Lesser General Public
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** License version 2.1 as published by the Free Software Foundation and
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** appearing in the file LICENSE.LGPL included in the packaging of this
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** file. Please review the following information to ensure the GNU Lesser
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** General Public License version 2.1 requirements will be met:
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU General
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** Public License version 3.0 as published by the Free Software Foundation
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** and appearing in the file LICENSE.GPL included in the packaging of this
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** file. Please review the following information to ensure the GNU General
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** Public License version 3.0 requirements will be met:
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** http://www.gnu.org/copyleft/gpl.html.
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** Alternatively, this file may be used in accordance with the terms and
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** conditions contained in a signed written agreement between you and Nokia.
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****************************************************************************/
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#include "qdebugmessageservice_p.h"
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#include "qqmldebugservice_p_p.h"
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#include <QDataStream>
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Q_GLOBAL_STATIC(QDebugMessageService, qmlDebugMessageService)
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void DebugMessageHandler(QtMsgType type, const QMessageLogContext &ctxt,
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QDebugMessageService::instance()->sendDebugMessage(type, ctxt, buf);
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class QDebugMessageServicePrivate : public QQmlDebugServicePrivate
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QDebugMessageServicePrivate()
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, prevState(QQmlDebugService::NotConnected)
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QMessageHandler oldMsgHandler;
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QQmlDebugService::State prevState;
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QDebugMessageService::QDebugMessageService(QObject *parent) :
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QQmlDebugService(*(new QDebugMessageServicePrivate()),
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QStringLiteral("DebugMessages"), 2, parent)
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Q_D(QDebugMessageService);
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if (state() == Enabled) {
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d->oldMsgHandler = qInstallMessageHandler(DebugMessageHandler);
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d->prevState = Enabled;
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QDebugMessageService *QDebugMessageService::instance()
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return qmlDebugMessageService();
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void QDebugMessageService::sendDebugMessage(QtMsgType type,
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const QMessageLogContext &ctxt,
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Q_D(QDebugMessageService);
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//We do not want to alter the message handling mechanism
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//We just eavesdrop and forward the messages to a port
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//only if a client is connected to it.
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QDataStream ws(&message, QIODevice::WriteOnly);
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ws << QByteArray("MESSAGE") << type << QString::fromLocal8Bit(buf).toUtf8();
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ws << QString::fromLatin1(ctxt.file).toUtf8();
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ws << ctxt.line << QString::fromLatin1(ctxt.function).toUtf8();
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sendMessage(message);
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if (d->oldMsgHandler)
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(*d->oldMsgHandler)(type, ctxt, buf);
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void QDebugMessageService::stateChanged(State state)
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Q_D(QDebugMessageService);
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if (state != Enabled && d->prevState == Enabled) {
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QMessageHandler handler = qInstallMessageHandler(d->oldMsgHandler);
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// has our handler been overwritten in between?
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if (handler != DebugMessageHandler)
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qInstallMessageHandler(handler);
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} else if (state == Enabled && d->prevState != Enabled) {
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d->oldMsgHandler = qInstallMessageHandler(DebugMessageHandler);
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d->prevState = state;