生成二维码与返回流
using System;using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Web;
namespace Glonee.Handler
{
/// <summary>
/// ErWeiMa 的摘要说明
/// </summary>
public class ErWeiMa : IHttpHandler
{
public void Proce***equest(HttpContext context)
{
context.Response.ContentType = "text/plain";
string strSource = context.Request.Params["strSource"];
string text = "";
int width = 250;
int height = 250;
string fontName = "楷体";
Image image = (GetTwoDimensionCode(strSource,text,width,height,fontName));
context.Response.ContentType = "image/jpeg";
image.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
image.Dispose();
}
public bool IsReusable
{
get
{
return false;
}
}
public static Bitmap GetTwoDimensionCode(string strSource,
string text, int width, int height, string fontName)
{
// 创建Bitmap对象
Bitmap bmp = new Bitmap(width, height);
// 从image创建 Graphics对象
Graphics objGraphics = Graphics.FromImage(bmp);
// 填上背景色
objGraphics.FillRectangle(Brushes.White, 0, 0, bmp.Width, bmp.Height);
//
ThoughtWorks.QRCode.Codec.QRCodeEncoder qrCodeEncoder =
new ThoughtWorks.QRCode.Codec.QRCodeEncoder();
// 设置编码方法
qrCodeEncoder.QRCodeEncodeMode =
ThoughtWorks.QRCode.Codec.QRCodeEncoder.ENCODE_MODE.BYTE;
// 设置大小
qrCodeEncoder.QRCodeScale = 3;
// 适用于信息量较少的情形，图像越小保存的信息量越少
// qrCodeEncoder.QRCodeScale = 4;
// 设置版本
qrCodeEncoder.QRCodeVersion = 0;
// 设置错误校验的级别，正因为二维码有纠错能力，才能够加入logo
qrCodeEncoder.QRCodeErrorCorrect =
ThoughtWorks.QRCode.Codec.QRCodeEncoder.ERROR_CORRECTION.M;
Image image = qrCodeEncoder.Encode(strSource, Encoding.GetEncoding("utf-8"));
// 写入二维码
int x = (int)(width - image.Width) / 2;
int y = (int)(height - image.Height) / 2;
objGraphics.DrawImage(image, new Point(x, y));
// 添加Logo图标
image = Image.FromFile(@"G:\ASP.net\S2结业项目\MI\MI\img\logo-footer.png");
x = (int)(width - image.Width) / 2;
y = (int)(height - image.Height) / 2;
objGraphics.DrawImage(image, new Point(x, y));
// 写入字符串
//objGraphics.DrawString(text, new Font(fontName, 13, FontStyle.Bold),
// Brushes.Black, new PointF(43, 15));
return bmp;
}
}
}
想要使用这个返回的值 就直接src 去访问这个handler
文档来源：51CTO技术博客https://blog.51cto.com/u_15316096/3209767
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