正常行驶的bitmap类型的二维码格式,加载到PDF中,将会导致二维码失真,无法扫描。
矢量图可根据尺寸大小进行调节,不会出现失真模糊情况
所用依赖
<PackageReference Include="FreeSpire.PDF" Version="8.6.0" />//操作PDF依赖
<PackageReference Include="QRCoder" Version="1.4.3" />//生成二维码SVG依赖
//以下为代码说明
#region 生成svg格式的矢量二维码 public static string GetSvgQRCode(string plainText, int pixel)
{
var generator = new QRCodeGenerator();
var qrCodeData = generator.CreateQrCode(plainText, QRCodeGenerator.ECCLevel.Q);
var qrcode = new SvgQRCode(qrCodeData);
return qrcode.GetGraphic(pixel);
}
#endregion
#region
public IActionResult GetSvgQRPic()
{
var svgText = QRCodeService.GetSvgQRCode("http://www.baidu.com", 15); string svgName = $"{Guid.NewGuid().ToString()}.svg";
string filePath = "E:\\ZGQM\\QRCODE\\"+ svgName;
System.IO.File.WriteAllText(filePath, svgText);
byte[] byts = System.IO.File.ReadAllBytes(filePath);
return File(byts, "image/svg", svgName);
}
public IActionResult SvgTOPdf()
{
string pdfname = "shuangcengSingle.pdf";
string rootPath = "E:\\ZGQM\\QRCODE\\";
//加载示例SVG图片
PdfDocument doc1 = new PdfDocument();
doc1.LoadFromSvg(rootPath + "a2.svg");
//加载示例PDF文档
PdfDocument doc2 = new PdfDocument();
doc2.LoadFromFile(rootPath + pdfname);
//设置图片在文档中的位置和大小59
var pdfwidth = doc2.Pages[0].Size.Width;
var pdfheight = doc2.Pages[0].Size.Height;
//计算两厘米二维码的磅值
double zb = 0;
if(pdfwidth<=pdfheight)
zb = 20 / (pdfwidth * 25.4 / 72);
else
zb = 20/ (pdfheight * 25.4 / 72);
double twocodezb = zb * (pdfwidth<= pdfheight?pdfwidth:pdfheight);
int twotruecode = Convert.ToInt32(Math.Round(twocodezb));
var doctemp = doc1.Pages[0].CreateTemplate();
var p2 = new System.Drawing.PointF(0, 0);
var di = new System.Drawing.SizeF(twotruecode, twotruecode);
PdfCanvas d2z = doc2.Pages[0].Canvas;
d2z.DrawTemplate(doctemp, p2, di);
//保存PDF文档
doc2.SaveToFile(rootPath + "AddSVGImagetoPDF-"+pdfname+".pdf", FileFormat.PDF);
doc1.Close();
doc2.Close();
return null;
}
#endregion
以上可实现将矢量图进行绑定到PDF中,并且保证不失真。
参考部分连接
https://www.e-iceblue.cn/pdf_java_conversion/convert-svg-to-pdf-and-add-a-svg-image-to-pdf-in-java.html
https://cloud.tencent.com/developer/article/1518580?from=15425&areaSource=102001.24&traceId=X5ThA0l7o2dpqbZKzQB2_