asp.net(C#)利用QRCode生成二维码(续)-在二维码图片中心加Logo或图像

Posted 2020-08-05 fiting

<%@ WebHandler Language="C#" Class="GetQRCode" %>  
  
using System;  
using System.Web;  
  
using ThoughtWorks.QRCode.Codec;  
using ThoughtWorks.QRCode.Codec.Data;  
using ThoughtWorks.QRCode.Codec.Util;  
using System.IO;  
using System.Text;  
using System.Drawing;  
using System.Drawing.Drawing2D;  
  
public class GetQRCode : IHttpHandler  
{  
  
    public void ProcessRequest(HttpContext context)  
    {  
  
        String data = context.Request["CodeText"];  
        if (!string.IsNullOrEmpty(data))  
        {  
            QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();  
            qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;  
            qrCodeEncoder.QRCodeScale = 4;  
            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/201292891051540.jpg")).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 Image CombinImage(Image imgBack, string destImg)  
    {  
        Image img = Image.FromFile(destImg);        //照片图片      
        if (img.Height != 65 || img.Width != 65)  
        {  
            img = KiResizeImage(img, 65, 65, 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 Image KiResizeImage(Image bmp, int newW, int newH, int Mode)  
    {  
        try  
        {  
            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;  
        }  
    }  
}