Qt 使用QRencode生成二维码图片并显示

1）根据字符串生成QPixmap数据

QPixmap OBSBasic::createQRCode(const QString &text)
{
 int margin = 2;
 if (text.length() == 0)
 {
  return QPixmap();
 }
 QRcode *qrcode = QRcode_encodeString(text.toLocal8Bit(), 2, QR_ECLEVEL_L, QR_MODE_8, 0);
 if (qrcode == NULL) {
  return QPixmap();
 }
 unsigned char *p, *q;
 p = NULL;
 q = NULL;
 int x, y, bit;
 int realwidth;

 realwidth = qrcode->width;
 QImage image = QImage(realwidth, realwidth, QImage::Format_Indexed8);
 QRgb value;
 value = qRgb(255, 255, 255);
 image.setColor(0, value);
 value = qRgb(0, 0, 0);
 image.setColor(1, value);
 image.setColor(2, value);
 image.fill(0);
 p = qrcode->data;
 for (y = 0; ywidth; y++) {
  bit = 7;
  q += margin / 8;
  bit = 7 - (margin % 8);
  for (x = 0; xwidth; x++) {
   if ((*p & 1) << bit)
    image.setPixel(x, y, 1);
   else
    image.setPixel(x, y, 0);
   bit--;
   if (bit < 0)
   {
    q++;
    bit = 7;
   }
   p++;
  }
 }
 return QPixmap::fromImage(image.scaledToWidth(200));
}

 

2）显示数据

label->setPixmap(createQRCode(shared_qr_code));