参考了：http://blog.csdn.net/smartsmile2012/article/details/17119755
这里写一下二维码和条形码的帮助类。
CodeHelper
首先 通过nuget下载
PS: 这里是ZXing，不是google的那个
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Configuration;
using ThoughtWorks.QRCode.Codec;
using ZXing;
using ZXing.Common;
namespace WebTest
{
public class Common
{
//QRCode
private static string QRCodeImgUrl_Relative = WebConfigurationManager.AppSettings["QRCodeImgUrl"];
//BarCode
private static string BarCodeImgUrl_Relative = WebConfigurationManager.AppSettings["BarCodeImgUrl"];
//Logo
private static string LogoImgUrl_Relative = WebConfigurationManager.AppSettings["LogoImgUrl"];
private static string QRCodeImgUrl = System.Web.HttpContext.Current.Request.MapPath(QRCodeImgUrl_Relative);
private static string BarCodeImgUrl = System.Web.HttpContext.Current.Request.MapPath(BarCodeImgUrl_Relative);
private static string LogoImgUrl = System.Web.HttpContext.Current.Request.MapPath(LogoImgUrl_Relative);
/// <summary>
/// 二维码
/// </summary>
/// <returns></returns>
public string CreateQRCode(string Code, bool HasLogo = false, int Size = 50)
{
Bitmap image = Create_ImgCode(Code, Size);
System.IO.MemoryStream MStream = new System.IO.MemoryStream();
image.Save(MStream, System.Drawing.Imaging.ImageFormat.Png);
if (HasLogo)
{
System.IO.MemoryStream MStream1 = new System.IO.MemoryStream();
CombinImage(image, LogoImgUrl).Save(MStream1, System.Drawing.Imaging.ImageFormat.Png);
}
string imgPath = SaveImg(QRCodeImgUrl, image);
return imgPath;
}
/// <summary>
/// 二维码(内存)
/// </summary>
/// <returns></returns>
public MemoryStream CreateQRCodeMS(string Code, bool HasLogo = false, int Size = 50)
{
Bitmap image = Create_ImgCode(Code, Size);
if (HasLogo)
{
System.IO.MemoryStream MStream1 = new System.IO.MemoryStream();
CombinImage(image, LogoImgUrl).Save(MStream1, System.Drawing.Imaging.ImageFormat.Png);
return MStream1;
}
System.IO.MemoryStream MStream = new System.IO.MemoryStream();
image.Save(MStream, System.Drawing.Imaging.ImageFormat.Png);
return MStream;
}
/// <summary>
/// 条形码(一维码)
/// </summary>
/// <returns></returns>
public string CreateBarCode(string Code)
{
string filename = Uri.EscapeUriString(Code) + ".png";//文件名进行encode,防止特殊字符
string saveFileName = BarCodeImgUrl + filename;
string httpFileName = BarCodeImgUrl_Relative + filename;
if (!File.Exists(saveFileName))
{
EncodingOptions options = new EncodingOptions();
options.Width = 2;
options.Height = 100;
options.PureBarcode = true;
BarcodeWriter writer = new BarcodeWriter();
writer.Options = options;
writer.Format = BarcodeFormat.CODE_128;
Bitmap img = writer.Write(Code);
//判断目录是否存在
if (!Directory.Exists(BarCodeImgUrl))
{
Directory.CreateDirectory(BarCodeImgUrl);
}
img.Save(saveFileName);
}
return httpFileName;
}
/// <summary>
/// 条形码(一维码)(内存)
/// </summary>
/// <returns></returns>
public MemoryStream CreateBarCodeMS(string Code)
{
MemoryStream ms = new MemoryStream();
EncodingOptions options = new EncodingOptions();
options.Width = 2;
options.Height = 100;
options.PureBarcode = true;
BarcodeWriter writer = new BarcodeWriter();
writer.Options = options;
writer.Format = BarcodeFormat.CODE_128;
Bitmap img = writer.Write(Code);
img.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
return ms;
}
/// <summary>
/// 保存图片
/// </summary>
/// <param name="strPath"></param>
/// <param name="img"></param>
private string SaveImg(string strPath, Bitmap img)
{
//保存图片到目录
if (!Directory.Exists(strPath))
{
Directory.CreateDirectory(strPath);
}
//文件名称
string guid = Guid.NewGuid().ToString().Replace("-", "") + ".png";
img.Save(strPath + guid);
return QRCodeImgUrl_Relative + guid;
}
/// <summary>
/// 生成二维码图片
/// </summary>
/// <param name="codeNumber">要生成二维码的字符串</param>
/// <param name="size">大小尺寸</param>
/// <returns>二维码图片</returns>
private Bitmap Create_ImgCode(string codeNumber, int size)
{
//创建二维码生成类
QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
//设置编码模式
qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
//设置编码测量度
qrCodeEncoder.QRCodeScale = size;
//设置编码版本
qrCodeEncoder.QRCodeVersion = 0;
//设置编码错误纠正
qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
//生成二维码图片
System.Drawing.Bitmap image = qrCodeEncoder.Encode(codeNumber);
return image;
}
/// <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 != 200 || img.Width != 200)
{
img = KiResizeImage(img, 200, 200, 0);
}
Graphics g = Graphics.FromImage(imgBack);
g.DrawImage(imgBack, 0, 0, imgBack.Width, imgBack.Height);
g.DrawImage(img, (imgBack.Width - img.Width) / 2, (imgBack.Width - 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;
}
}
}
}调用方法：
一 ，使用缓存显示图片
前台：
<img style="margin: 5px; 230px;" src="GetImg?qrCode=@Model.ListNo">后台：
public ActionResult GetImg(string qrCode)
{
CodeHelper ch = new CodeHelper();
var q = ch.CreateQRCodeMS(qrCode);
return File(q.ToArray(), "image/jpeg");
}二 ，使用文件显示图片
前台：
<img style="margin: 5px; 230px;" src="<%=imgBarCode.ImageUrl %>">后台：
public void makeQRCode(string code){
CodeHelper codeHelper=new CodeHelper();
var imgUrl=codeHelper.CreateQRCode(code,true);
//全局变量，提供给页面调用
imgBarCode.ImageUrl = imgUrl;
}