Any ideas, how to encode QR data into png image? - qt

Question

All I need is simple (Q)string to put it as embedded image like:
<img src="data:image/png;base64,iVBORw...">
I use: #include <qrencode.h> (linux -> apt-get install libqrencode-dev)
This is my code:
QRcode *qr=QRcode_encodeString(QString("my test string").toStdString().c_str(), 1, QR_ECLEVEL_L, QR_MODE_8,1);
QByteArray *ba = new QByteArray();
for (unsigned int y=0; y<qr->width;y++)
{
int yy=y*qr->width;
for (unsigned int x=0; x<qr->width;x++)
{
int xx=yy+x;
const unsigned char b=qr->data[xx];
///WHAT TO DO NOW??? IS IT CORRECT?
ba->push_back(b);
qDebug()<<"Char "<<b;
if(b &0x01)
{
qDebug()<<"Point +++";
}
}
}
qDebug()<<ba->toBase64();
Any ideas, how to encode qr->data into a png image?

Answer 1

I did it! :)
First version, without scaling
#include<QString>
#include<QDebug>
#include<QByteArray>
#include<QBuffer>
#include<QImage>
#include<QImageWriter>
#include<QPixmap>
#include<QPainter>
#include<QColor>
#include<QPointF>
#include<QRectF>
//ustawiam kolory
QColor bialy = Qt::white;
QColor czarny = Qt::black;
//PNG
QByteArray ImageAsByteArray;
QBuffer ImageBuffer(&ImageAsByteArray);
ImageBuffer.open(QIODevice::WriteOnly);
QRcode *qr=QRcode_encodeString(QString("afya.pl").toStdString().c_str(), 1, QR_ECLEVEL_L, QR_MODE_8,1);
QPixmap p(qr->width,qr->width);
QPainter pa;
pa.begin(&p);
pa.setRenderHints(QPainter::SmoothPixmapTransform | QPainter::HighQualityAntialiasing |QPainter::TextAntialiasing| QPainter::Antialiasing);
pa.setPen(bialy);
pa.setBrush(bialy);
//czyścimy tło
QPointF a=QPointF(0.0,0.0);
QPointF b=QPointF(p.width(),p.height());
pa.drawRect(QRectF(a,b));
pa.setPen(czarny);
for (unsigned int y=0; y<qr->width;y++)
{
int yy=y*qr->width;
for (unsigned int x=0; x<qr->width;x++)
{
int xx=yy+x;
const unsigned char b=qr->data[xx];
if(b &0x01){
a=QPointF(y,x);
pa.drawPoint(a);
}
}
}
p.save(&ImageBuffer,"PNG");
qDebug()<<ImageAsByteArray.toBase64();
}