一、前言
ZXing.Net的一个可移植软件包，是一个开源的、多格式的1D/2D条形码图像处理库，最初是用Java实现的。已经过大量优化和改进，它已经被手动移植。它与.Net 2.0、.Net 3.5、.Net 4.x、.Net 5.x、.Net 6.x、.Net 7.x、Windows RT类库和组件、UWP、.Net Standard 1.x和2.0x、.Net Core App 3.x、Silverlight 4、Silverlight 5、Windows Phone 7.x和Windows Phone 8.x以及Xamarin.Android兼容。
二、项目环境和搭建
项目框架：.NET Framework 4.6.1
项目依赖：ZXing.Net
项目结构和界面设计：
三、实现核心代码
ZXing帮助类
/// <summary>
/// ZXing.NET 二维码帮助类
/// </summary>
public class ZXingHelper
{
/// <summary>
/// 站点二维码的目录
/// </summary>
private static string QRCodeDirectory = "QRCode";
/// <summary>
/// 使用zxing动态库生成二维码
/// </summary>
/// <param name="conetnt">二维码内容</param>
/// <param name="errorMessage">异常信息</param>
/// <param name="logoPath">logo图片路径，默认为空。为空时生成的二维码不带logo</param>
/// <param name="height">二维码图片高度，默认240 单位 pixels</param>
/// <param name="width">二维码图片宽度，默认240 单位 pixels</param>
/// <param name="margin">二维码图片边距，默认为0</param>
/// <returns></returns>
public static Bitmap GenerateQRCode(string conetnt, out string errorMessage, string logoPath = "", int height = 240, int width = 240, int margin = 0)
{
errorMessage = string.Empty;
try
{
BarcodeWriter barCodeWriter = new BarcodeWriter();
barCodeWriter.Format = BarcodeFormat.QR_CODE;
barCodeWriter.Options.Hints.Add(EncodeHintType.CHARACTER_SET, "UTF-8");
barCodeWriter.Options.Hints.Add(EncodeHintType.ERROR_CORRECTION, ZXing.QrCode.Internal.ErrorCorrectionLevel.H);
barCodeWriter.Options.Height = height;
barCodeWriter.Options.Width = width;
barCodeWriter.Options.Margin = margin;
BitMatrix bm = barCodeWriter.Encode(conetnt);
Bitmap qrCodeImage = barCodeWriter.Write(bm);
if (!string.IsNullOrEmpty(logoPath))
{
// 添加Logo
Bitmap logo = new Bitmap(logoPath);
int logoSize = (int)(qrCodeImage.Width * 0.2); // Logo大小为二维码大小的1/5
int logoX = (qrCodeImage.Width - logoSize) / 2;
int logoY = (qrCodeImage.Height - logoSize) / 2;
Graphics qrGraphics = Graphics.FromImage(qrCodeImage);
qrGraphics.DrawImage(logo, new Rectangle(logoX, logoY, logoSize, logoSize));
}
return qrCodeImage;
}
catch (Exception ex)
{
errorMessage = $"Exception raised when generating QRCode,, Exception;{ex}";
return null;
}
}
/// <summary>
/// 使用zxing动态库解析:二维码，条形码......
/// </summary>
/// <param name="image">二维码图像</param>
/// <returns></returns>
public static string ParseBarCode(Bitmap image)
{
BarcodeReader reader = new BarcodeReader();
Result result = reader.Decode(image);
return result.Text;
}
/// <summary>
/// 使用zxing动态库生成二维码
/// </summary>
/// <param name="conetnt">二维码内容</param>
/// <param name="logoPath">logo图片路径，默认为空。为空时生成的二维码不带logo</param>
/// <param name="height">二维码图片高度，默认240 单位 pixels</param>
/// <param name="width">二维码图片宽度，默认240 单位 pixels</param>
/// <param name="margin">二维码图片边距，默认为0</param>
/// <returns></returns>
public static void GenerateQRCode(string conetnt, string logoPath = "", int height = 240, int width = 240, int margin = 0)
{
try
{
BarcodeWriter barCodeWriter = new BarcodeWriter();
barCodeWriter.Format = BarcodeFormat.QR_CODE;
barCodeWriter.Options.Hints.Add(EncodeHintType.CHARACTER_SET, "UTF-8");
barCodeWriter.Options.Hints.Add(EncodeHintType.ERROR_CORRECTION, ZXing.QrCode.Internal.ErrorCorrectionLevel.H);
barCodeWriter.Options.Height = height;
barCodeWriter.Options.Width = width;
barCodeWriter.Options.Margin = margin;
BitMatrix bm = barCodeWriter.Encode(conetnt);
Bitmap qrCodeImage = barCodeWriter.Write(bm);
if (!string.IsNullOrEmpty(logoPath))
{
// 添加Logo
Bitmap logo = new Bitmap(logoPath);
int logoSize = (int)(qrCodeImage.Width * 0.2); // Logo大小为二维码大小的1/5
int logoX = (qrCodeImage.Width - logoSize) / 2;
int logoY = (qrCodeImage.Height - logoSize) / 2;
Graphics qrGraphics = Graphics.FromImage(qrCodeImage);
qrGraphics.DrawImage(logo, new Rectangle(logoX, logoY, logoSize, logoSize));
}
string qrCodeFile = AppDomain.CurrentDomain.BaseDirectory + QRCodeDirectory + "/" + "qrcode.jpg";
if (File.Exists(qrCodeFile))
{
File.Delete(qrCodeFile);
}
qrCodeImage.Save(qrCodeFile, System.Drawing.Imaging.ImageFormat.Jpeg);//保存二维码图片
}
catch (Exception ex)
{
}
}
}
选择logo
/// <summary>
/// 选择logo
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_selectlogo_Click(object sender, EventArgs e)
{
try
{
OpenFileDialog openFileDialog = new OpenFileDialog();
openFileDialog.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);//初始路径为桌面
openFileDialog.Filter = "Logo图片|*.png;*.jpg;*.jpeg;*.ico";
if (openFileDialog.ShowDialog() == DialogResult.OK)
{
picLogo.Image = Image.FromFile(openFileDialog.FileName);
logPath = openFileDialog.FileName;//logo文件路径
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
生成二维码
/// <summary>
/// 生成二维码
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void bt_generate_Click(object sender, EventArgs e)
{
try
{
string errorMsg = "";
string content = rtbQRCodeContent.Text;
if (string.IsNullOrWhiteSpace(content))
{
MessageBox.Show("二维码内容不能为空！");
return;
}
picQRCode.Image = ZXingHelper.GenerateQRCode(content, out errorMsg, logPath);
if (!string.IsNullOrWhiteSpace(errorMsg))
{
MessageBox.Show(errorMsg);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
识别二维码
/// <summary>
/// 识别二维码
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_identityQrCode_Click(object sender, EventArgs e)
{
try
{
if (picQRCode.Image == null)
{
MessageBox.Show("请先生成二维码！");
return;
}
Bitmap Imagemap = new Bitmap(picQRCode.Image);
string QRCodeResult = ZXingHelper.ParseBarCode(Imagemap);
rtbQRCodeResult.Text = QRCodeResult;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
保存二维码
/// <summary>
/// 保存二维码
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_save_Click(object sender, EventArgs e)
{
try
{
if (picQRCode.Image == null)
{
MessageBox.Show("请先生成二维码！");
return;
}
SaveFileDialog saveFileDialog = new SaveFileDialog();
saveFileDialog.Filter = "保存图片|*.png;*.jpg;*.jpeg";
if (saveFileDialog.ShowDialog() == DialogResult.OK)
{
picQRCode.Image.Save(saveFileDialog.FileName, ImageFormat.Png);
MessageBox.Show("保存成功！");
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
四、实现演示
文章来源：https://www.toymoban.com/news/detail-711608.html
五、源码工具获取
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