.net 生成二維碼
阿新 • • 發佈:2022-05-06
需要的類
安裝包 QRCoder
1. QRCodeHelper 二維碼幫助類
namespace SmartGardon.Common.QRCode { /// <summary> /// 二維碼幫助類 /// </summary> public class QRCodeHelper { /// <summary> /// 生成二維碼圖片 /// </summary> /// <param name="str"></param> /// <returns></returns> public Bitmap CreateQRimg(string str) { QRCodeGenerator qrGenerator = new QRCodeGenerator(); QRCodeData qrCodeData = qrGenerator.CreateQrCode(str, QRCodeGenerator.ECCLevel.Q); QRCoder.QRCode qrCode = new QRCoder.QRCode(qrCodeData); Bitmap bt = qrCode.GetGraphic(20); return bt; } /// <summary> /// 生成二維碼圖片流(二維碼上含文字) /// </summary> /// <param name="str1">二維碼中要傳遞的資料(地址)</param> /// <param name="str2">二維碼上顯示的文字說明</param> public byte[] GenerateQRCode(string str1, string str2) { using (Image codeImage = CreateQRimg(str1), strImage = ConvertStringToImage(str2)) { Image img = CombineImage(600, 600, codeImage, 60, 50, strImage, 0, 530); using (var stream = new MemoryStream()) { img.Save(stream, ImageFormat.Jpeg); //輸出圖片流 return stream.ToArray(); } } } /// <summary> /// 生成二維碼圖片流(不含文字) /// </summary> /// <param name="str">二維碼中要傳遞的資料(地址)</param> /// <returns></returns> public byte[] GenerateQRCode(string str) { using (Image codeImage = CreateQRimg(str)) { using (var stream = new MemoryStream()) { codeImage.Save(stream, ImageFormat.Jpeg); return stream.ToArray(); } } } /// <summary> /// 生成文字圖片 /// </summary> /// <param name="str"></param> /// <returns></returns> public Image ConvertStringToImage(string str) { Bitmap image = new Bitmap(600, 40, PixelFormat.Format24bppRgb); Graphics g = Graphics.FromImage(image); Font font = new Font("SimHei", 14, FontStyle.Regular); g.Clear(Color.White); StringFormat format = new StringFormat(); format.Alignment = StringAlignment.Center; format.LineAlignment = StringAlignment.Center; Rectangle rectangle = new Rectangle(0, 0, 600, 40); g.DrawString(str, font, new SolidBrush(Color.Black), rectangle, format); return image; } /// <summary> /// 在畫板中合併二維碼圖片和文字圖片 /// </summary> /// <param name="width"></param> /// <param name="height"></param> /// <param name="imgLeft"></param> /// <param name="imgLeft_left"></param> /// <param name="imgLeft_top"></param> /// <param name="imgRight"></param> /// <param name="imgRight_left"></param> /// <param name="imgRight_top"></param> /// <returns></returns> public Image CombineImage(int width, int height, Image imgLeft, int imgLeft_left, int imgLeft_top, Image imgRight, int imgRight_left, int imgRight_top) { Bitmap image = new Bitmap(width, height, PixelFormat.Format24bppRgb); Graphics g = Graphics.FromImage(image); g.Clear(Color.White); g.DrawImage(imgLeft, imgLeft_left, imgLeft_top, 500, 500); g.DrawImage(imgRight, imgRight_left, imgRight_top, imgRight.Width, imgRight.Height); return image; } } }
2.使用QRCodeHelper
public virtual async Task<string> GetQRCodeAsync() { var qrCode = new QRCodeHelper();var url = "https://www.baidu.com"; var image = qrCode.GenerateQRCode(url, “顯示的文字資訊”); string result = "data:image/jpg;base64," + Convert.ToBase64String(image);return result; }