C++ QDataStream::version方法代码示例

bool QSvgIconEngine::read(QDataStream &in)
{
    d = new QSvgIconEnginePrivate;
    d->svgBuffers = new QHash<int, QByteArray>;

    if (in.version() >= QDataStream::Qt_4_4) {
        int isCompressed;
        QHash<int, QString> fileNames;  // For memoryoptimization later
        in >> fileNames >> isCompressed >> *d->svgBuffers;
#ifndef QT_NO_COMPRESS
        if (!isCompressed) {
            foreach(int key, d->svgBuffers->keys())
                d->svgBuffers->insert(key, qCompress(d->svgBuffers->value(key)));
        }

void tst_QPicture::serialization()
{
    QDataStream stream;
    const int thisVersion = stream.version();

    for (int version = QDataStream::Qt_1_0; version <= thisVersion; ++version) {
        const QDataStream::Version versionEnum = static_cast<QDataStream::Version>(version);

        {
            // streaming of null pictures
            ensureSerializesCorrectly(QPicture(), versionEnum);
        }
        {
            // picture with a simple line, checking bitwise equality
            QPicture picture;
            QPainter painter(&picture);
            painter.drawLine(10, 20, 30, 40);
            ensureSerializesCorrectly(picture, versionEnum);
        }
    }

    {
        // Test features that were added after Qt 4.5, as that was hard-coded as the major
        // version for a while, which was incorrect. In this case, we'll test font hints.
        QPicture picture;
        QPainter painter;
        QFont font;
        font.setStyleName("Blah");
        font.setHintingPreference(QFont::PreferFullHinting);
        painter.begin(&picture);
        painter.setFont(font);
        painter.drawText(20, 20, "Hello");
        painter.end();

        Picture customPicture;
        painter.begin(&customPicture);
        picture.play(&painter);
        const QFont actualFont = ((PaintEngine*)customPicture.paintEngine())->font();
        painter.end();
        QCOMPARE(actualFont.styleName(), QStringLiteral("Blah"));
        QCOMPARE(actualFont.hintingPreference(), QFont::PreferFullHinting);
    }
}

//.........这里部分代码省略.........
		int no = objects.find( *b );
		if ( no != -1 ) {
		    packUInt16( out2, a.key() );
		    packUInt16( out2, no );
		}
		++b;
	    }
	    ++a;
	}
    }

    if ( !connectionsElem.isNull() ) {
	QString prevLanguage = "C++";
	int prevSenderNo = 0;
	QString prevSignal = "clicked()";
	int prevReceiverNo = 0;
	QString prevSlot = "accept()";

	QDataStream out2( connectionsBlock, IO_WriteOnly );
	QDomElement f = connectionsElem.firstChild().toElement();
	while ( !f.isNull() ) {
	    if ( f.tagName() == "connection" ) {
		QMap<QString, QString> argMap;

		QDomElement g = f.firstChild().toElement();
		while ( !g.isNull() ) {
		    argMap[g.tagName()] = g.firstChild().toText().data();
		    g = g.nextSibling().toElement();
		}

		QString language = f.attribute( "language", "C++" );
		int senderNo = objects.find( argMap["sender"], widgetNo );
		int receiverNo = objects.find( argMap["receiver"], widgetNo );
		QString signal = UibHack::normalize( argMap["signal"] );
		QString slot = UibHack::normalize( argMap["slot"] );

		Q_UINT8 connectionFlags = 0;
		if ( language != prevLanguage )
		    connectionFlags |= Connection_Language;
		if ( senderNo != prevSenderNo )
		    connectionFlags |= Connection_Sender;
		if ( signal != prevSignal )
		    connectionFlags |= Connection_Signal;
		if ( receiverNo != prevReceiverNo )
		    connectionFlags |= Connection_Receiver;
		if ( slot != prevSlot )
		    connectionFlags |= Connection_Slot;
		out2 << connectionFlags;

		if ( connectionFlags & Connection_Language )
		    packString( strings, out2, language );
		if ( connectionFlags & Connection_Sender )
		    packUInt16( out2, senderNo );
		if ( connectionFlags & Connection_Signal )
		    packStringSplit( strings, out2, signal, '(' );
		if ( connectionFlags & Connection_Receiver )
		    packUInt16( out2, receiverNo );
		if ( connectionFlags & Connection_Slot )
		    packStringSplit( strings, out2, slot, '(' );

		prevLanguage = language;
		prevSenderNo = senderNo;
		prevSignal = signal;
		prevReceiverNo = receiverNo;
		prevSlot = slot;
	    } else if ( f.tagName() == "slot" ) {
		// ###
	    }
	    f = f.nextSibling().toElement();
	}
    }

    {
	QDataStream out2( introBlock, IO_WriteOnly );
	out2 << introFlags;
	out2 << defaultMargin;
	out2 << defaultSpacing;
	packUInt16( out2, objects.count() );
	packCString( strings, out2, className );
    }

    out << UibMagic;
    out << (Q_UINT8) '\n';
    out << (Q_UINT8) '\r';
    out << (Q_UINT8) out.version();
    outputBlock( out, Block_Strings, strings.block() );
    outputBlock( out, Block_Intro, introBlock );
    outputBlock( out, Block_Images, imagesBlock );
    outputBlock( out, Block_Widget, widgetBlock );
    outputBlock( out, Block_Slots, slotsBlock );
    outputBlock( out, Block_Tabstops, tabstopsBlock );
    outputBlock( out, Block_Actions, actionsBlock );
    outputBlock( out, Block_Menubar, menubarBlock );
    outputBlock( out, Block_Toolbars, toolbarsBlock );
    outputBlock( out, Block_Variables, variablesBlock );
    outputBlock( out, Block_Functions, functionsBlock );
    outputBlock( out, Block_Buddies, buddiesBlock );
    outputBlock( out, Block_Connections, connectionsBlock );
    out << (Q_UINT8) Block_End;
}