QT 字元串轉二維碼

1.主要是調用了qrencode-3.4.4庫來生成的二維碼。

該庫需要導入到工程中的檔案如下：

QPixmap paintTwoCode(const QString str)
{
    QRcode *qrcode;
    qrcode = QRcode_encodeString(str.toStdString().c_str(), 2, QR_ECLEVEL_Q, QR_MODE_8, 1);

    qint32 temp_width = 140;
    qint32 temp_height= 140;
    qint32 qrcode_width = qrcode->width > 0 ? qrcode->width : 1;
    double scale_x = (double)temp_width / (double)qrcode_width;
    double scale_y =(double) temp_height /(double) qrcode_width;
    QImage mainimg=QImage(temp_width,temp_height,QImage::Format_ARGB32);

    QPainter painter(&mainimg);
    QColor background(Qt::white);
    painter.setBrush(background);
    painter.setPen(Qt::NoPen);
    painter.drawRect(0, 0, temp_width, temp_height);
    QColor foreground(Qt::black);
    painter.setBrush(foreground);
    for( qint32 y = 0; y < qrcode_width; y ++)
    {
        for(qint32 x = 0; x < qrcode_width; x++)
        {
            unsigned char b = qrcode->data[y * qrcode_width + x];
            if(b & 0x01)
            {
                QRectF r(x * scale_x, y * scale_y, scale_x, scale_y);
                painter.drawRects(&r, 1);
            }
        }
    }
    QPixmap mainmap=QPixmap::fromImage(mainimg);
    return mainmap;
}