使用QRencode做二维码QR码生成

//qr.h
#ifndef QR_H
#define QR_H#include <qrencode.h>
#include <qimage.h>
#include <qstring.h>class QR
{
public:QR();//生产二维码QImage produceQR(const QString &info);public :static QImage produceQrTest(const QString &info);
};#endif // QR_H

//qr.cpp
#include "qr.h"#include <QPainter>
#include <QImage>QR::QR()
{}QImage  QR::produceQrTest(const QString &info)
{//放置二维码QImage dst;//绘制方块大小int scale = 4;//将字符串转字符集合，同时定义编码格式为UTF8QByteArray info_date = info.toUtf8();//调用libqrencode库进行编码QRcode* qr = QRcode_encodeString(info_date.constData(), 0, QR_ECLEVEL_Q, QR_MODE_8, 1);//绘制if (qr && qr->width > 0){//设置图像大小int img_width = qr->width * scale;//创建画布dst = QImage(img_width, img_width, QImage::Format_Mono);//创建油漆工QPainter painter(&dst);//填充白色背景painter.fillRect(0, 0, img_width, img_width, Qt::white);//设置画笔painter.setPen(Qt::NoPen);//设置黑色刷子painter.setBrush(Qt::black);//绘制二维码for (int y = 0; y < qr->width; y++){for (int x = 0; x < qr->width; x++){//绘制黑块if (qr->data[y*qr->width + x] & 1){QRect r(x*scale, y*scale, scale, scale);painter.drawRect(r);}}}QRcode_free(qr);}return dst;}

//调用
QImage qr = QR::produceQrTest(qstr);int x = ui->label_QRCode->size().width() - 20;
int y = ui->label_QRCode->size().height() - 20;
QSize size = QSize(x, y);m_QR_img = qr.scaled(size, Qt::KeepAspectRatio);ui->label_QRCode->setPixmap(QPixmap::fromImage(m_QR_img));