Mega Code Archive
Saving file with QDataStream
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Foundations of Qt Development\Chapter08\datastream\main.cpp
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of APress nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <QFile>
#include <QDataStream>
#include <QList>
#include <QColor>
#include <QtDebug>
struct ColorText
{
QString text;
QColor color;
};
QDataStream &operator<<( QDataStream &stream, const ColorText &data )
{
stream << data.text << data.color;
return stream;
}
QDataStream &operator>>( QDataStream &stream, ColorText &data )
{
stream >> data.text;
stream >> data.color;
return stream;
}
void saveList()
{
QList<ColorText> list;
ColorText data;
data.text = "Red";
data.color = Qt::red;
list << data;
data.text = "Blue";
data.color = Qt::blue;
list << data;
data.text = "Yellow";
data.color = Qt::yellow;
list << data;
data.text = "Green";
data.color = Qt::green;
list << data;
QFile file( "test.dat" );
if( !file.open( QIODevice::WriteOnly ) )
return;
QDataStream stream( &file );
stream.setVersion( QDataStream::Qt_4_2 );
stream << list;
file.close();
}
void loadList()
{
QList<ColorText> list;
QFile file( "test.dat" );
if( !file.open( QIODevice::ReadOnly ) )
return;
QDataStream stream( &file );
stream.setVersion( QDataStream::Qt_4_2 );
stream >> list;
file.close();
foreach( ColorText data, list )
qDebug() << data.text << "("
<< data.color.red() << ","
<< data.color.green() << ","
<< data.color.blue() << ")";
}
int main( int argc, char **argv )
{
saveList();
loadList();
return 0;
}
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