1、需要引入Gma.QrCodeNet.Encoding.Net35；
2、先看下图片素材
 |  |
3、结果
4、前台代码
@{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>测试</title>
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.js"></script>
<style>
#btn {
border:1px solid #ddd;
color:#333;
padding:5px 20px;
}
#img {
width:375px;
height:667px;
}
</style>
</head>
<body>
<div>
<input type="button" value="下载" id="btn"/>
<img id="img"/>
<div id="tip">
</div>
</div>
<script>
$("#btn").click(function () {
$.post("/Home/GetQrCode", {}, function (data) {
if (data.Success) {
$("#tip").append("<p>" + data.Message + "</p>");
$("#img").attr("src", data.Url);
location.href = "/Home/DownFileQrCode/" + data.Message;
} else {
alert("生成失败！");
}
});
});
</script>
</body>
</html>5、后台代码
using System.Web.Mvc;
using Gma.QrCodeNet.Encoding;
using Gma.QrCodeNet.Encoding.Windows.Render;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System;
namespace QeCodeTest.Controllers
{
public class HomeController : Controller
{
// GET: Home
public ActionResult Index()
{
return View();
}
/// <summary>
/// 图片下载
/// </summary>
/// <param name="id">文件名</param>
/// <returns></returns>
public FilePathResult DownFileQrCode(string id)
{
var path = Server.MapPath("/QrCode/" + id + ".png");
var filename = Path.GetFileName(path);
return File(path, "application/octet-stream", filename);
}
/// <summary>
/// 请求生成图片
/// </summary>
/// <returns></returns>
[HttpPost]
public ActionResult GetQrCode() {
string content = "你好啊";//二维码生成所需的内容文字
string name = DateTime.Now.ToString("yyyyMMddHHmmss");//二维码名称
//开始生成二维码
var encoder = new QrEncoder(ErrorCorrectionLevel.M);
QrCode qrCode = encoder.Encode(content);
GraphicsRenderer render = new GraphicsRenderer(new FixedModuleSize(14, QuietZoneModules.Two), Brushes.Black, Brushes.White);
DrawingSize dSize = render.SizeCalculator.GetSize(qrCode.Matrix.Width);
//将二维码信息画在GDI+位图上面
Bitmap map = new Bitmap(dSize.CodeWidth, dSize.CodeWidth);
Graphics g = Graphics.FromImage(map);
render.Draw(g, qrCode.Matrix);
//将GDI+位图转换为流数据
MemoryStream ms = new MemoryStream();
map.Save(ms, ImageFormat.Png);
//流数据可以保存
//if (!Directory.Exists(Server.MapPath("/QrCode/")))
//{
// Directory.CreateDirectory(Server.MapPath("/QrCode/"));//不存在就创建目录
//}
//map.Save(Server.MapPath("/QrCode/" + name + ".png"), ImageFormat.Png);
//获取背景图片
Image qrcodebgimg = Image.FromFile(Server.MapPath("/Comm/001.jpg"));
//获取二维码的图片
Image qrcodeimg = Image.FromStream(ms);
//获取头像的图片
Image img = Image.FromFile(Server.MapPath("/Comm/002.png"));
//将背景转换为GID+位图 准备操作
Bitmap qrcodebgmap = new Bitmap(qrcodebgimg);
//位图转换为画板
Graphics qrcodebgg = Graphics.FromImage(qrcodebgmap);
//开始画二维码和头像
//初始化一个位置
Point qrcodePoint = new Point((qrcodebgmap.Width - qrcodeimg.Width) / 2, (qrcodebgmap.Height - qrcodeimg.Height) / 2);
qrcodebgg.DrawImage(qrcodeimg, qrcodePoint.X, qrcodePoint.Y, qrcodeimg.Width, qrcodeimg.Height);
//初始化一个位置
Point iconPoint = new Point((qrcodebgmap.Width - img.Width) / 2, (qrcodebgmap.Height - img.Height) / 2);
qrcodebgg.DrawImage(img, iconPoint.X, iconPoint.Y, img.Width, img.Height);
//写字
//画刷颜色
SolidBrush txtBrush = new SolidBrush(ColorTranslator.FromHtml("#FFFFFF"));
//格式居中
StringFormat txtFromat = new StringFormat();
txtFromat.Alignment = StringAlignment.Center;
//开始画 文字 字体 画笔 位置中间
qrcodebgg.DrawString("你好啊，这段话是文字", new Font("黑体", 20), txtBrush, new Point(qrcodebgmap.Width/2, 20),txtFromat);
qrcodebgg.DrawString("点击关注", new Font("黑体", 20), txtBrush, new Point(qrcodebgmap.Width/2, 60), txtFromat);
//可转换为流数据进行操作
//MemoryStream qrcodebgms = new MemoryStream();
//qrcodebgmap.Save(qrcodebgms, ImageFormat.Png);
string Path = Server.MapPath("/QrCode/" + name + ".png");
qrcodebgmap.Save(Path, ImageFormat.Png);
return Json(new {Success=true,Message= name, Url= "/QrCode/" + name + ".png" });
}
}
}
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