Qt实现字符串生成二维码功能

QString qExePath = QCoreApplication::applicationDirPath();
QDir::setCurrent(qExePath);

#include <QPainter>
#include <xstring>
class CQRCodeOperation
{
public:
    CQRCodeOperation();
    ~CQRCodeOperation();
    QImage GeneratedGraphics(std::string sData, QSize nsize); //生成图形
private:
    QPixmap m_imgIcon;
};

QImage image(nsize, QImage::FORMat_RGB32);
image.fill(QColor("#000000"));

QPainter painter(&image);
if (!painter.isActive())
{
	return image;
}

QRcode *qrCode = QRcode_encodeString(sData.c_str(), 1, QR_ECLEVEL_L, QR_MODE_8, 1);

QColor colorForPoint("#FFB6C1");
QColor colorForBackground("#ffffff");

painter.setBrush(colorForBackground);
painter.setPen(Qt::NoPen);
painter.drawRect(0, 0, image.width(), image.height());

painter.setBrush(colorForPoint);

const double &&s = (qrCode->width > 0) ? (qrCode->width) : (1);
const double &&aspect = image.width() / image.height();
const double &&scale = ((aspect > 1.0) ? image.height() : image.width()) / s;

for (int y = 0; y < s; ++y)
{
	const int &&yy = static_cast<int>(y * s);
	for (int x = 0; x < s; ++x)
	{
		const int &&xx = yy + x;
		const unsigned char &b = qrCode->data[xx];

		if (b & 0x01)
		{
			const double rx1 = x * scale, ry1 = y * scale;
			QRectF r(rx1, ry1, scale, scale);
			painter.drawRects(&r, 1);
		}
	}
}

QRcode_free(qrCode);

painter.setRenderHint(QPainter::Antialiasing, true); //抗锯齿
int nLeft = (nsize.width() - 30) / 2;
int nTop = (nsize.height() - 30) / 2;
QRect rectPng(nLeft, nTop,30,30);
painter.drawPixmap(rectPng, m_imgIcon);

painter.end();

CQRCodeOperation dlg;
QImage img = dlg.GeneratedGraphics(sText, QSize(250, 250));
ui.labpng->setPixmap(QPixmap::fromImage(img));