标签:防止 for 重复 dev com exce draw 二维码 get
添加引用:
ThoughtWorks.QRCode.dll
System.Drawing
using System; using System.Collections.Generic; using System.Linq; using System.Threading.Tasks; using Microsoft.AspNetCore.Authorization; using Microsoft.AspNetCore.Cors; using Microsoft.AspNetCore.Mvc; using System.Drawing; using System.Text; using ThoughtWorks.QRCode.Codec; using System.IO; namespace App.Web.APIControllers { /// <summary> /// 生成二维码 /// </summary> public class QRCodeController : Controller { /// <summary> /// 生成二维码 /// </summary> /// <param name="enCodeString">要生成二维码的文字</param> /// <returns></returns> [HttpGet] [AllowAnonymous] public string QRCode(string enCodeString) { Bitmap bt; QRCodeEncoder qrCodeEncoder = new QRCodeEncoder(); qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;//编码方式(注意:BYTE能支持中文,ALPHA_NUMERIC扫描出来的都是数字) qrCodeEncoder.QRCodeScale = 10;//大小(值越大生成的二维码图片像素越高) qrCodeEncoder.QRCodeVersion = 0;//版本(注意:设置为0主要是防止编码的字符串太长时发生错误) qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;//错误效验、错误更正(有4个等级) qrCodeEncoder.QRCodeBackgroundColor = Color.White;//背景色 qrCodeEncoder.QRCodeForegroundColor = Color.Black;//前景色 bt = qrCodeEncoder.Encode(enCodeString, Encoding.UTF8); string filename = enCodeString;// "code"; string file_path = AppDomain.CurrentDomain.BaseDirectory + "QRCode\\"; string codeUrl = file_path + filename + ".jpg"; //根据文件名称,自动建立对应目录 if (!System.IO.Directory.Exists(file_path)) { System.IO.Directory.CreateDirectory(file_path); } ////防止内容重复,导致名称重复问题, ////若要每次更新,可去掉本段代码 ↓↓↓↓↓ //int i = 1; //while (System.IO.File.Exists(codeUrl)) //{ // string _filename = filename + "("+i+")"; // codeUrl = file_path + _filename + ".jpg"; // i++; //} //// ↑↑↑↑↑↑↑ bt.Save(codeUrl);//保存图片 return codeUrl; } /// <summary> /// 生成二维码【方法二】 /// </summary> /// <param name="qrCodeScale">尺寸4-15</param> /// <param name="qrCodeVersion">复杂级别3-12</param> /// <param name="qrCodeErrorCorrect">容错量"H","L","M","Q"</param> /// <param name="enCodeString">二维码信息</param> /// <returns></returns> [HttpGet] [AllowAnonymous] public string CreateEQcoder(int qrCodeScale, int qrCodeVersion, string qrCodeErrorCorrect, string enCodeString) { QRCodeEncoder qrCodeEncoder = new QRCodeEncoder(); qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE; qrCodeEncoder.QRCodeScale = qrCodeScale; qrCodeEncoder.QRCodeVersion = qrCodeVersion; switch (qrCodeErrorCorrect) { case "H": qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H; break; case "L": qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L; break; case "M": qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M; break; case "Q": qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.Q; break; } qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L; Bitmap bmPhoto = qrCodeEncoder.Encode(enCodeString, System.Text.Encoding.GetEncoding("UTF-8")); string fileName = enCodeString+"_"+ qrCodeScale+"_"+qrCodeVersion+"_"+ qrCodeErrorCorrect; string file_path = AppDomain.CurrentDomain.BaseDirectory + "QRCode\\"; string savePath = file_path + fileName + ".jpg"; try { if (!Directory.Exists(file_path)) { Directory.CreateDirectory(file_path); } //防止内容重复,导致名称重复问题,若要每次更新,可去掉本段代码 ↓↓↓↓↓ int i = 1; while (System.IO.File.Exists(savePath)) { string _filename = fileName + "(" + i + ")"; savePath = file_path + _filename + ".jpg"; i++; } //↑↑↑↑↑↑↑ bmPhoto.Save(savePath); bmPhoto.Dispose(); return savePath ; } catch (Exception) { return ""; } finally { bmPhoto.Dispose(); } } } }
原文链接:https://www.cnblogs.com/dyhao/p/11595714.html
标签:防止 for 重复 dev com exce draw 二维码 get
原文地址:https://www.cnblogs.com/duhaoran/p/13879168.html