c/c++语言开发共享Qt实现字符串生成二维码功能

目录

• 前言
• 开发环境
• 实现步骤
• 资源包数据
• 配置属性
• 二维码操作
• 总结

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));