艺海无涯,学无止境。欢迎一起探讨技术和人生,了解我

ASP.NET 生成二维码 带中心logo图标

ThoughtWorks.QRCode.dll (5.92 mb)下载

QRCodeHandler.ashx 代码如下

<%@ WebHandler Language="C#" Class="QRCodeHandler" %>

using System;
using System.Web;
using ThoughtWorks.QRCode.Codec;
using System.Drawing;
using System.Drawing.Drawing2D;

public class QRCodeHandler : IHttpHandler {

    public void ProcessRequest(HttpContext context)
    {
        String data = context.Request["url"];
        if (!string.IsNullOrEmpty(data))
        {
            QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
            qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
            qrCodeEncoder.QRCodeScale = 2;
            qrCodeEncoder.QRCodeVersion = 8;
            qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
            System.Drawing.Image image = qrCodeEncoder.Encode(data);
            System.IO.MemoryStream MStream = new System.IO.MemoryStream();
            image.Save(MStream,System.Drawing.Imaging.ImageFormat.Png);

            System.IO.MemoryStream MStream1 = new System.IO.MemoryStream();
            CombinImage(image, context.Server.MapPath("~/images/favicon.ico")).Save(MStream1, System.Drawing.Imaging.ImageFormat.Png);
            context.Response.ClearContent();
            context.Response.ContentType = "image/png";
            context.Response.BinaryWrite(MStream1.ToArray());

            //image.Dispose();  
            MStream.Dispose();
            MStream1.Dispose();
        }

        context.Response.Flush();
        context.Response.End();
    }

    /// <summary>    
    /// 调用此函数后使此两种图片合并,类似相册,有个    
    /// 背景图,中间贴自己的目标图片    
    /// </summary>    
    /// <param name="imgBack">粘贴的源图片</param>    
    /// <param name="destImg">粘贴的目标图片</param>    
    public static System.Drawing.Image CombinImage(System.Drawing.Image imgBack, string destImg)
    {
        System.Drawing.Image img = System.Drawing.Image.FromFile(destImg);        //照片图片      
        if (img.Height != 65 || img.Width != 65)
        {
            img = KiResizeImage(img, 32, 32, 0);
        }
        Graphics g = Graphics.FromImage(imgBack);

        g.DrawImage(imgBack, 0, 0, imgBack.Width, imgBack.Height);      //g.DrawImage(imgBack, 0, 0, 相框宽, 相框高);     

        //g.FillRectangle(System.Drawing.Brushes.White, imgBack.Width / 2 - img.Width / 2 - 1, imgBack.Width / 2 - img.Width / 2 - 1,1,1);//相片四周刷一层黑色边框    

        //g.DrawImage(img, 照片与相框的左边距, 照片与相框的上边距, 照片宽, 照片高);    

        g.DrawImage(img, imgBack.Width / 2 - img.Width / 2, imgBack.Width / 2 - img.Width / 2, img.Width, img.Height);
        GC.Collect();
        return imgBack;
    }


    /// <summary>    
    /// Resize图片    
    /// </summary>    
    /// <param name="bmp">原始Bitmap</param>    
    /// <param name="newW">新的宽度</param>    
    /// <param name="newH">新的高度</param>    
    /// <param name="Mode">保留着,暂时未用</param>    
    /// <returns>处理以后的图片</returns>    
    public static System.Drawing.Image KiResizeImage(System.Drawing.Image bmp, int newW, int newH, int Mode)
    {
        try
        {
            System.Drawing.Image b = new Bitmap(newW, newH);
            Graphics g = Graphics.FromImage(b);
            // 插值算法的质量    
            g.InterpolationMode = InterpolationMode.HighQualityBicubic;
            g.DrawImage(bmp, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel);
            g.Dispose();
            return b;
        }
        catch
        {
            return null;
        }
    }
 
    public bool IsReusable {
        get {
            return false;
        }
    }

}