这期内容当中小编将会给大家带来有关C#中怎么给PDF 添加可视化和不可见数字签名,文章内容丰富且以专业的角度为大家分析和叙述,阅读完这篇文章希望大家可以有所收获。
鼠标右键点击“引用”,“管理Nuget包”
点击“浏览”,在搜索框中输入“Spire.PDF ”,点击选择搜索到的包,点击“安装”。
在弹出的窗口点击“OK”
等待安装完成。安装结果如图:
C#
using Spire.Pdf; using Spire.Pdf.Graphics; using Spire.Pdf.Interactive.DigitalSignatures; using System.Drawing; using System.Security.Cryptography.X509Certificates; namespace VisibleDigitalSignature { class Program { static void Main(string[] args) { //加载PDF测试文档 PdfDocument pdf = new PdfDocument(); pdf.LoadFromFile("test.pdf"); //获取PDF文档中的第5页 PdfPageBase page = pdf.Pages[4]; //在页面中的指定位置添加可视化签名 X509Certificate2 x509 = new X509Certificate2("cer.pfx", "e-iceblue"); PdfOrdinarySignatureMaker signatureMaker = new PdfOrdinarySignatureMaker(pdf, x509); IPdfSignatureAppearance signatureAppearance = new PdfCustomSignatureAppearance(); signatureMaker.MakeSignature("signName_" , page, page.ActualSize.Width-240,page.ActualSize.Height-200,150,150, signatureAppearance); //保存文档 pdf.SaveToFile("VisibleDigitalSignature.pdf", FileFormat.PDF); System.Diagnostics.Process.Start("VisibleDigitalSignature.pdf"); pdf.Close(); } public class PdfCustomSignatureAppearance : IPdfSignatureAppearance { public void Generate(PdfCanvas g) { float fontSize = 15; PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("Arial", fontSize), true); float lineHeight = fontSize; g.DrawString("Sign Here:", font, PdfBrushes.Black, new PointF(0, 0)); g.DrawImage(PdfImage.FromFile("sign.png"), new PointF(20, 20)); } } } }
Vb.net
Imports Spire.Pdf Imports Spire.Pdf.Graphics Imports Spire.Pdf.Interactive.DigitalSignatures Imports System.Drawing Imports System.Security.Cryptography.X509Certificates Namespace VisibleDigitalSignature Class Program Private Shared Sub Main(args As String()) '加载PDF测试文档 Dim pdf As New PdfDocument() pdf.LoadFromFile("test.pdf") '获取PDF文档中的第5页 Dim page As PdfPageBase = pdf.Pages(4) '在页面中的指定位置添加可视化签名 Dim x509 As New X509Certificate2("cer.pfx", "e-iceblue") Dim signatureMaker As New PdfOrdinarySignatureMaker(pdf, x509) Dim signatureAppearance As IPdfSignatureAppearance = New PdfCustomSignatureAppearance() signatureMaker.MakeSignature("signName_", page, page.ActualSize.Width - 240, page.ActualSize.Height - 200, 150, 150, _ signatureAppearance) '保存文档 pdf.SaveToFile("VisibleDigitalSignature.pdf", FileFormat.PDF) System.Diagnostics.Process.Start("VisibleDigitalSignature.pdf") pdf.Close() End Sub Public Class PdfCustomSignatureAppearance Implements IPdfSignatureAppearance Public Sub Generate(g As PdfCanvas) Dim fontSize As Single = 15 Dim font As New PdfTrueTypeFont(New Font("Arial", fontSize), True) Dim lineHeight As Single = fontSize g.DrawString("Sign Here:", font, PdfBrushes.Black, New PointF(0, 0)) g.DrawImage(PdfImage.FromFile("sign.png"), New PointF(20, 20)) End Sub End Class End Class End Namespace
可视化数字签名效果:
C#
using Spire.Pdf; using Spire.Pdf.Interactive.DigitalSignatures; using System.Security.Cryptography.X509Certificates; namespace InvisibleDigitalSignature { class Program { static void Main(string[] args) { //初始化一个PdfDocument实例 PdfDocument pdf = new PdfDocument(); //加载PDF文档 pdf.LoadFromFile("test.pdf"); //添加签名 X509Certificate2 x509 = new X509Certificate2("cer.pfx", "e-iceblue"); PdfOrdinarySignatureMaker signatureMaker = new PdfOrdinarySignatureMaker(pdf, x509); signatureMaker.MakeSignature("signName"); signatureMaker.SetLocation("Chengdu"); signatureMaker.SetReason("Edit limited"); //保存文档 pdf.SaveToFile("result.pdf", FileFormat.PDF); System.Diagnostics.Process.Start("result.pdf"); } } }
Vb.net
Imports Spire.Pdf Imports Spire.Pdf.Interactive.DigitalSignatures Imports System.Security.Cryptography.X509Certificates Namespace InvisibleDigitalSignature Class Program Private Shared Sub Main(args As String()) '初始化一个PdfDocument实例 Dim pdf As New PdfDocument() '加载PDF文档 pdf.LoadFromFile("test.pdf") '添加签名 Dim x509 As New X509Certificate2("cer.pfx", "e-iceblue") Dim signatureMaker As New PdfOrdinarySignatureMaker(pdf, x509) signatureMaker.MakeSignature("signName") signatureMaker.SetLocation("Chengdu") signatureMaker.SetReason("Edit limited") '保存文档 pdf.SaveToFile("result.pdf", FileFormat.PDF) System.Diagnostics.Process.Start("result.pdf") End Sub End Class End Namespace
不可见数字签名效果:
上述就是小编为大家分享的C#中怎么给PDF 添加可视化和不可见数字签名了,如果刚好有类似的疑惑,不妨参照上述分析进行理解。如果想知道更多相关知识,欢迎关注亿速云行业资讯频道。
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