首先建一个asp.net页面，里面包含生成所需的logo上传file控件：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="QrLogCode.aspx.cs" Inherits="AdminTest_QrLogCode" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>二维码生成工具（带log）</title>
<script type="text/javascript" src="../Jscript/admin/jquery-1.4.2.js"></script>
<script src="../Jscript/admin/jquery.form.js" type="text/javascript"></script>
<style type="text/css">
.style1
{
width: 100%;
min-width: 800px;
text-align: left;
}
.txt
{
width: 40%;
}
</style>
</head>
<body>
<form id="form1" enctype="multipart/form-data">
<div>
<table class="style1">
<tr>
<td style="text-align: right; width: 20%;">
输入要生成二维码的内容：
</td>
<td>
<input type="text" id="txt_qr" name="txt_qr" value="https://www.zhengdecai.com/" class="txt" /> <span>请使用生成“<a
href="BarCode.aspx">条形码</a>”</span>
</td>
</tr>
<tr>
<td style="text-align: right;">
二维码图片：
</td>
<td>
<img id="qrimg" alt="二维码图片" src="../images/20130424105224.jpg" />
</td>
</tr>
<tr>
<td style="text-align: right;">
log图片：
</td>
<td>
<input type="file" id="fileLog" name="fileLog" />
</td>
</tr>
<tr>
<td style="text-align: right;">
尺寸大小：
</td>
<td>
<input id="txt_size" name="txt_size" type="text" value="4" class="txt" />
</td>
</tr>
<tr>
<td colspan="4">
<div style="text-align: left; padding-left: 200px; margin-top: 50px;">
<input id="btnSubmit" type="button" value="生成二维码" /></div>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
<script type="text/javascript">
$(function () {
$("#btnSubmit").click(function () {
/*if ($("[id$='fileLog']").val() == "") {
alert("请选择log图片的文件!");
return false;
}*/
var txt_qr = $("#txt_qr").val();
var txt_size = $("#txt_size").val();
$("[id$='form1']").ajaxSubmit({
url: "../AjaxUrl/Admin/QrLogCode.ashx",
type: "post",
dataType: 'text',
resetForm: "true",
success: function (data) {
var dataObj = data;
if ($(dataObj).text() != "") {
$("#qrimg").attr("src", "../File/" + $(dataObj).text());
}
else {
$("#qrimg").attr("src", "../File/" + dataObj);
}
$("#txt_qr").val(txt_qr);
$("#txt_size").val(txt_size);
},
error: function (request, message, ex) {
alert("错误：" + message);
}
});
});
});
</script>
建一个一般处理程序进行生成二维码图片和logo图片，把logo图片水印到二维码图片上，得到带有logo的二维码
<%@ WebHandler Language="C#" Class="QrLogCode" %>
using System;
using System.Web;
using ThoughtWorks.QRCode.Codec;
using ThoughtWorks.QRCode.Codec.Data;
using System.Drawing;
using System.Text.RegularExpressions;
using System.Text;
using System.IO;
using System.Collections;
using System.Web.Services;
public class QrLogCode : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
int resultVal = (int)ReturnVal.Failed;
string fileAbsPath = "";
string filename = "";
string filepath = "";
try
{
HttpPostedFile myFile = context.Request.Files["fileLog"];
if (myFile != null)
{
if (myFile.InputStream.Length != 0)
{
string originalFileName = Path.GetExtension(myFile.FileName); //原文件名
string newFileName = DateTime.Now.ToString("yyyyMMddhhmmss") + originalFileName;
fileAbsPath = context.Server.MapPath(@"~\File") + "\\" + newFileName; //绝对路径
myFile.SaveAs(fileAbsPath);
resultVal = (int)ReturnVal.Succeed;
}
else
{
resultVal = (int)ReturnVal.FileEmpty;
}
}
else
{
resultVal = (int)ReturnVal.NotSelected;
}
}
catch (Exception)
{
resultVal = (int)ReturnVal.Failed;
}
string txt_qr = ConverToGB(context.Request["txt_qr"].ToString().Trim(), 16);
string qrEncoding = "Byte";
string Level = "M";
string txt_ver = "7";
string txt_size = context.Request["txt_size"].ToString();
QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
String encoding = qrEncoding;
if (encoding == "Byte")
{
qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
}
try
{
int scale = Convert.ToInt16(txt_size);
qrCodeEncoder.QRCodeScale = scale;
}
catch (Exception ex)
{
return;
}
try
{
int version = Convert.ToInt16(txt_ver);
qrCodeEncoder.QRCodeVersion = version;
}
catch (Exception ex)
{
return;
}
string errorCorrect = Level;
if (errorCorrect == "L")
qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;
Image image;
String data = txt_qr;
image = qrCodeEncoder.Encode(data);
filename = DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";
filepath = context.Server.MapPath(@"~\File") + "\\" + filename;
System.IO.FileStream fs = new System.IO.FileStream(filepath, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write);
image.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg);
fs.Close();
image.Dispose();
if (resultVal == 1)
{
string imgFile = ImageWatermark(filepath, fileAbsPath, 30);
if (File.Exists(fileAbsPath))
{
File.Delete(fileAbsPath);
}
if (File.Exists(imgFile))
{
File.Delete(imgFile);
}
}
context.Response.Clear();
context.Response.Write(filename.Trim());
}
#region 返回值
/// <summary>
/// 返回值
/// </summary>
private enum ReturnVal : int
{
/// <summary>
/// 不能上传 0 K大小的文件
/// </summary>
FileEmpty = -2,
/// <summary>
/// 未选中文件
/// </summary>
NotSelected = -1,
/// <summary>
/// 上传失败
/// </summary>
Failed = 0,
/// <summary>
/// 成功
/// </summary>
Succeed = 1
}
#endregion
/// <summary>
/// 10进制或16进制转换为中文
/// </summary>
/// <param name="name">要转换的字符串</param>
/// <param name="fromBase">进制（10或16）</param>
/// <returns></returns>
public string ConverToGB(string text, int fromBase)
{
string value = text;
MatchCollection mc;
System.Text.StringBuilder sb = new System.Text.StringBuilder();
switch (fromBase)
{
case 10:
MatchCollection mc1 = Regex.Matches(text, @"&#([\d]{5})", RegexOptions.Compiled | RegexOptions.IgnoreCase);
foreach (Match _v in mc1)
{
string w = _v.Value.Substring(2);
w = Convert.ToString(int.Parse(w), 16);
byte[] c = new byte[2];
string ss = w.Substring(0, 2);
int c1 = Convert.ToInt32(w.Substring(0, 2), 16);
int c2 = Convert.ToInt32(w.Substring(2), 16);
c[0] = (byte)c2;
c[1] = (byte)c1;
sb.Append(Encoding.Unicode.GetString(c));
}
value = sb.ToString();
break;
case 16:
mc = Regex.Matches(text, @"\\u([\w]{2})([\w]{2})", RegexOptions.Compiled | RegexOptions.IgnoreCase);
if (mc != null && mc.Count > 0)
{
foreach (Match m2 in mc)
{
string v = m2.Value;
string w = v.Substring(2);
byte[] c = new byte[2];
int c1 = Convert.ToInt32(w.Substring(0, 2), 16);
int c2 = Convert.ToInt32(w.Substring(2), 16);
c[0] = (byte)c2;
c[1] = (byte)c1;
sb.Append(Encoding.Unicode.GetString(c));
}
value = sb.ToString();
}
break;
}
return value;
}
/// <summary>
/// 图片水印处理方法
/// </summary>
/// <param name="path">需要加载水印的图片路径（绝对路径）</param>
/// <param name="waterpath">水印图片（绝对路径）</param>
/// <param name="waterpath">水印图片最大宽度</param>
/// <returns></returns>
private string ImageWatermark(string path, string waterpath, int maxW)
{
//获取文件扩展名
string kz_name = Path.GetExtension(path);
string fileNames = "";
//暂时只支持给.JPG,.BMP,.JPEG格式加水印
if (kz_name == ".jpg" || kz_name == ".bmp" || kz_name == ".jpeg" || kz_name == ".png" || kz_name == ".gif")
{
//设置新的文件名
DateTime time = DateTime.Now;
string filename = "" + time.Year.ToString() + time.Month.ToString() + time.Day.ToString() + time.Hour.ToString() + time.Minute.ToString() + time.Second.ToString() + time.Millisecond.ToString();
//加载需要加载水印的图片
Image img = Bitmap.FromFile(path);
//加载水印图片
Image waterimg = Image.FromFile(waterpath);
//添加水印
Graphics g = Graphics.FromImage(img);
//获取水印位置设置
ArrayList loca = new ArrayList();
int x = 0;
int y = 0;
int width = maxW;
int height = waterimg.Height / (waterimg.Width / maxW);
int cH = 0;
if (height < maxW)
{
cH = maxW - height;
}
x = img.Width / 2 - width / 2;
y = img.Height / 2 - height / 2 + cH / 2;
loca.Add(x);
loca.Add(y);
StringFormat sf = new StringFormat();
sf.Alignment = StringAlignment.Center; //这里是矩形框居中
sf.LineAlignment = StringAlignment.Center; //这里是文本居中
g.DrawImage(waterimg, new Rectangle(int.Parse(loca[0].ToString()), int.Parse(loca[1].ToString()), width, height));
//释放资源
waterimg.Dispose();
g.Dispose();
//保存水印图片
string newpath = Path.GetDirectoryName(path) + "\\" + filename + kz_name;
fileNames = filename + kz_name;
img.Save(newpath);
img.Dispose();
//将水印复制到原有图片
//将水印图片替换原有图片
File.Copy(newpath, path, true);
//删除水印
if (File.Exists(newpath))
{
File.Delete(newpath);
}
}
else
{
fileNames = "";
}
return fileNames;
}
public bool IsReusable
{
get
{
return false;
}
}
}
显示效果：
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