以下是生成二维码的方法，我只用其中一个方法 这个需要引用ZXing.DLL
链接：https://pan.baidu.com/s/1mCTwHiAm_awtsPcibAotZw
提取码：ufp6
public class QRcode
{
//需要引用ZXing.DLL 可以百度一下 一个很好用的二维码生成程序集《DLL文件啦》
//使用案例：Bitmap img3 = GenByZXingNet("");
//使用案例：img3.Save(Server.MapPath(@"\testImg\erweima.png"));
/// <summary>
/// 生成二维码
/// </summary>
/// <param name="msg">二维码信息</param>
/// <param name="codeSizeInPixels">正方形 边长</param>
/// <returns>图片</returns>
public static Bitmap GenByZXingNet(string msg, int codeSizeInPixels = )
{
BarcodeWriter writer = new BarcodeWriter();
writer.Format = BarcodeFormat.QR_CODE;
writer.Options.Hints.Add(EncodeHintType.CHARACTER_SET, "UTF-8");//编码问题
writer.Options.Hints.Add(EncodeHintType.ERROR_CORRECTION, ZXing.QrCode.Internal.ErrorCorrectionLevel.H); writer.Options.Height = writer.Options.Width = codeSizeInPixels;
writer.Options.Margin = ;//设置边框1 ZXing.Common.BitMatrix bm = writer.Encode(msg);
Bitmap img = writer.Write(msg);
return img;
} #endregion #region C#生成带有Log的二维码
/// <summary>
/// 生成带Logo的二维码
/// </summary>
/// <param name="text">文本内容</param>
static void Generate(string text, string LogoPth, string serverPth, ImageFormat imgFrt)
{
//Logo 图片
Bitmap logo = new Bitmap(LogoPth);
//构造二维码写码器
MultiFormatWriter writer = new MultiFormatWriter();
Dictionary<EncodeHintType, object> hint = new Dictionary<EncodeHintType, object>();
hint.Add(EncodeHintType.CHARACTER_SET, "UTF-8");
hint.Add(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); //生成二维码
BitMatrix bm = writer.encode(text, BarcodeFormat.QR_CODE, , , hint);
BarcodeWriter barcodeWriter = new BarcodeWriter();
Bitmap map = barcodeWriter.Write(bm); //获取二维码实际尺寸（去掉二维码两边空白后的实际尺寸）
int[] rectangle = bm.getEnclosingRectangle(); //计算插入图片的大小和位置
int middleW = Math.Min((int)(rectangle[] / 3.5), logo.Width);
int middleH = Math.Min((int)(rectangle[] / 3.5), logo.Height);
int middleL = (map.Width - middleW) / ;
int middleT = (map.Height - middleH) / ; //将img转换成bmp格式，否则后面无法创建Graphics对象
Bitmap bmpimg = new Bitmap(map.Width, map.Height, PixelFormat.Format32bppArgb);
using (Graphics g = Graphics.FromImage(bmpimg))
{
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
g.DrawImage(map, , );
}
//将二维码插入图片
Graphics myGraphic = Graphics.FromImage(bmpimg);
//白底
myGraphic.FillRectangle(Brushes.White, middleL, middleT, middleW, middleH);
myGraphic.DrawImage(logo, middleL, middleT, middleW, middleH); //保存成图片
bmpimg.Save(serverPth, imgFrt);
}
#endregion #region ZXing生成条形码
/// <summary>
/// 文本内容
/// </summary>
/// <param name="text">只支持数字 只支持偶数个 最大长度80</param>
/// <param name="ServerPTh">存储路径 @"H:\桌面\截图\generate2.png"</param>
public static void Generate(string text, string ServerPth, ImageFormat imgFrt)
{
BarcodeWriter writer = new BarcodeWriter();
//使用ITF 格式，不能被现在常用的支付宝、微信扫出来
//如果想生成可识别的可以使用 CODE_128 格式
//writer.Format = BarcodeFormat.ITF;
writer.Format = BarcodeFormat.CODE_128;
EncodingOptions options = new EncodingOptions()
{
Width = ,
Height = ,
Margin =
};
writer.Options = options;
Bitmap map = writer.Write(text);
string filename = ServerPth;//请注意 保存格式和文件扩展名一致性
map.Save(filename, imgFrt);
} /// <summary>
/// 文本内容 生成条形码
/// </summary>
/// <param name="text">只支持数字 最大长度80</param>
/// <param name="ServerPTh">文件夹名称</param>
/// <param name="fileName">文件名</param>
public static string GenerateTxm(string text, string category, string fileName, ImageFormat imgFrt)
{
var uploadPath = System.Configuration.ConfigurationSettings.AppSettings["UploadPath"]; //文件保存目录路径
string dirTempPath = uploadPath + "//" + category;
if (!Directory.Exists(dirTempPath))
{
Directory.CreateDirectory(dirTempPath);
}
string ServerPth = dirTempPath + "//" + fileName;//文件绝对路径
BarcodeWriter writer = new BarcodeWriter();
//使用ITF 格式，不能被现在常用的支付宝、微信扫出来
//如果想生成可识别的可以使用 CODE_128 格式
//writer.Format = BarcodeFormat.ITF;
writer.Format = BarcodeFormat.CODE_128;
EncodingOptions options = new EncodingOptions()
{
Width = ,
Height = ,
Margin =
};
writer.Options = options;
Bitmap map = writer.Write(text);
string filename = ServerPth;//请注意 保存格式和文件扩展名一致性
map.Save(filename, imgFrt);
return ServerPth;
}
#endregion #region 二维码 条形码读取
/// <summary>
/// 二维码 条形码读取
/// </summary>
/// <param name="filename">文件路径</param>
/// <returns></returns>
public static string Read(string filename)
{
BarcodeReader reader = new BarcodeReader();
reader.Options.CharacterSet = "UTF-8";
Bitmap map = new Bitmap(filename);
Result result = reader.Decode(map);
return result == null ? "" : result.Text;
}
#endregion #region C#生成特定颜色二维码-基础版本
//需要引用ZXing.DLL 可以百度一下 一个很好用的二维码生成程序集《DLL文件啦》
//使用案例：Bitmap img3 = GenByZXingNet("");
//使用案例：img3.Save(Server.MapPath(@"\testImg\erweima.png"));
/// <summary>
/// 生成二维码
/// </summary>
/// <param name="msg">二维码信息</param>
/// <param name="codeSizeInPixels">正方形 边长</param>
/// <returns>图片</returns>
public static Bitmap GenByZXingNet_Color(string msg, int codeSizeInPixels = )
{
BarcodeWriter writer = new BarcodeWriter();
writer.Renderer = new ZXing.Rendering.BitmapRenderer { Background = Color.Red, Foreground = Color.Blue };
writer.Format = BarcodeFormat.QR_CODE;
writer.Options.Hints.Add(EncodeHintType.CHARACTER_SET, "UTF-8");//编码问题
writer.Options.Hints.Add(EncodeHintType.ERROR_CORRECTION, ZXing.QrCode.Internal.ErrorCorrectionLevel.H); writer.Options.Height = writer.Options.Width = codeSizeInPixels;
writer.Options.Margin = ;//设置边框1 ZXing.Common.BitMatrix bm = writer.Encode(msg);
Bitmap img = writer.Write(msg);
return img;
} }
Bitmap b = QRcode.GenByZXingNet("二维码内容字符串");
MemoryStream ms = new MemoryStream();
b.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
byte[] bytes = ms.GetBuffer();
string textString = System.Convert.ToBase64String(bytes);//存DBd的字符串
ms.Close();
string ImgString;//存DB的字符串
byte[] arrBuffer = System.Convert.FromBase64String(ImgString);//转换成文件流
页面上展示
<img src="data:image/jpeg;base64,{{Data.ImgString}}">
我上面是后端的写法，现在用下面的写法比较简单
使用jquery.qrcode生成二维码
https://www.cnblogs.com/zhengweijie/p/6911834.html