年末更新！PDF开发API-Spire.PDF for .NET新版发布！支持通过外部服务进行数字签名

Spire.PDF for .NET更新至v6.12.20，该版本支持通过外部服务进行数字签名并且支持设置PDF包中文件的字段并对文件进行排序。此外还增强了PDF转换到PDF/A 和PDF/A -3b的功能，以及修复了在查找文本中出现的问题，欢迎下载体验。

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新功能

• 支持通过外部服务进行数字签名。

  void Sign()        {            PdfDocument doc = new PdfDocument();            doc.LoadFromFile(inputPath);            //Load the certificate            X509Certificate2 cert = new X509Certificate2(certPath, passwd);            CustomPKCS7SignatureFormatter customPKCS7SignatureFormatter = new CustomPKCS7SignatureFormatter(cert);            PdfSignature signature = new PdfSignature(doc, doc.Pages[0], customPKCS7SignatureFormatter, "signature0");            signature.Bounds = new RectangleF(new PointF(90, 550), new SizeF(270, 90));            //Set the dispay mode of graphics, if not set any, the default one will be applied            signature.GraphicsMode = GraphicMode.SignDetail;            signature.NameLabel = "Signer:";            signature.Name = "gary";            signature.ContactInfoLabel = "ContactInfo:";            signature.DateLabel = "Date:";            signature.Date = DateTime.Now;            signature.LocationInfoLabel = "Location:";            signature.LocationInfo = "Chengdu";            signature.ReasonLabel = "Reason: ";            signature.Reason = "The certificate of this document";            signature.DistinguishedNameLabel = "DN: ";            signature.DocumentPermissions = PdfCertificationFlags.AllowFormFill | PdfCertificationFlags.ForbidChanges;            signature.SignDetailsFont = new PdfFont(PdfFontFamily.TimesRoman, 10f);            signature.SignNameFont = new PdfFont(PdfFontFamily.Courier, 15);            signature.SignImageLayout = SignImageLayout.None;            //Save pdf file.            doc.SaveToFile(outputPath, Spire.Pdf.FileFormat.PDF);        }        class CustomPKCS7SignatureFormatter : IPdfSignatureFormatter        {            ////// If encapsulate is true, a copy of the message will be included in the signature.            ///private bool m_encapsulate = true;            ////// The signing certificate.            ///private X509Certificate2 m_certificate = null;            public Dictionary m_parameters = new Dictionary();            ////// Parameters for the encoding of the signature.            /// 1.Key:Filter,String            /// Required            /// The name of the preferred signature handler to use when validating this signature.            /// 2.SubFilter,String            /// Required            /// A name that describes the encoding of the signature value.            /// PDF 1.6 defines the following values for public-key cryptographic signatures: adbe.x509.rsa_sha1, adbe.pkcs7.detached, and adbe.pkcs7.sha1            /// 3.Cert,X509Certificate2            /// Required when SubFilter is adbe.x509.rsa_sha1            ///public Dictionary Parameters            {                get                { return m_parameters; }            }            ////// Construct a new instance.            //////The signing certificate.////// If encapsulate is true, a copy of the message will be included in the signature.            ///public CustomPKCS7SignatureFormatter(X509Certificate2 certificate)            {                if (null == certificate)                { throw new ArgumentNullException("certificate"); }                m_certificate = certificate;                Parameters.Add("Filter", "Adobe.PPKMS");                Parameters.Add("SubFilter", m_encapsulate "adbe.pkcs7.sha1" : "adbe.pkcs7.detached");            }            ////// Sign.            //////The data that contains signature content.///The signaturepublic byte[] Sign(byte[] content)            {                CmsSigner cmsSigner = new CmsSigner(m_certificate);                SHA1 sha1 = SHA1.Create();                SignedCms signedCms = new SignedCms(new ContentInfo(m_encapsulate sha1.ComputeHash(content) : content), !m_encapsulate);                signedCms.ComputeSignature(cmsSigner, true);                byte[] result = signedCms.Encode();                return result;            }        }

• 支持设置PDF包中文件的字段并对文件进行排序。

  string[] files = Directory.GetFiles(@"files");string inputFile = @"input.pdf";string outputFile = @"result.pdf";using (PdfDocument doc = new PdfDocument(inputFile)){    //添加字段    doc.Collection.AddCustomField("No", "序 ", Spire.Pdf.Collections.CustomFieldType.NumberField);    doc.Collection.AddFileRelatedField("FileName", "文件名称", Spire.Pdf.Collections.FileRelatedFieldType.FileName);    doc.Collection.AddFileRelatedField("Desc", "文件描述", Spire.Pdf.Collections.FileRelatedFieldType.Desc);    doc.Collection.AddFileRelatedField("CreateDate", "创建时间", Spire.Pdf.Collections.FileRelatedFieldType.CreationDate);    doc.Collection.AddFileRelatedField("ModDate", "修改时间", Spire.Pdf.Collections.FileRelatedFieldType.ModDate);    doc.Collection.AddFileRelatedField("FileSize", "文件大小", Spire.Pdf.Collections.FileRelatedFieldType.Size);    doc.Collection.AddCustomField("FileType", "文件类型", Spire.Pdf.Collections.CustomFieldType.TextField);    doc.Collection.AddCustomField("FileDate", "自定义时间", Spire.Pdf.Collections.CustomFieldType.DateField);    //根据字段对附件排序    doc.Collection.Sort(new string[] { "No", "fileName", "Desc", "CreateDate", "ModDate", "FileSize", "FileType", "FileDate" }, new bool[] { false, true, true, true, true, true, true, true });    for (int i = 0; i < files.Length; i++) { PdfAttachment attachment = new PdfAttachment(files[i]); doc.Collection.AddAttachment(attachment); } int n = 1; //设置字段值 foreach (PdfAttachment att in doc.Collection.AssociatedFiles) { att.SetFieldValue("No", n); att.Description = n + "文件描述"; att.SetFieldValue("FileDate", DateTime.Today); att.SetFieldValue("FileType", n + "文件"); n++; } doc.SaveToFile(outputFile, FileFormat.PDF); doc.Dispose(); }

• 支持添加附件时，指定文档关系。

  PdfDocument doc = new PdfDocument();doc.LoadFromFile(inputPath);PdfAttachment attachment = new PdfAttachment(attachmentPath);doc.Attachments.Add(attachment,doc,Spire.Pdf.General.PdfAttachmentRelationship.Alternative);doc.SaveToFile(outputPath);

• 支持在指定区域内查找文本。

  PdfDocument pdf = new PdfDocument();pdf.LoadFromFile(inputFile, FileFormat.PDF);RectangleF rctg = new RectangleF(0, 0, 200, 100);PdfTextFindCollection findCollection = pdf.Pages[0].FindText(rctg, "DEPOSIT", TextFindParameter.WholeWord);PdfTextFindCollection findCollectionOut = pdf.Pages[0].FindText(rctg, "agreement", TextFindParameter.WholeWord);foreach (PdfTextFind find in findCollection.Finds){ find.ApplyHighLight(Color.Green); }foreach (PdfTextFind findOut in findCollectionOut.Finds){ findOut.ApplyHighLight(Color.Yellow); }pdf.SaveToFile(outputFile, FileFormat.PDF);

Bug修复

• 修复了转换含附件的PDF到PDF/A-3b不符合规范的问题。
• 修复了转换含动作的PDF到PDF/A不符合规范的问题。
• 修复了获取书签时程序挂起的问题。
• 调整了.NET Standard平台下的PdfTrueTypeFont类的初始化方法。
• 修复了注释无法删除的问题。
• 修复了添加上下标导致字符间距不正确的问题。
• 修复了查找文本抛“NullReferenceException”的问题。
• 修复了查找文本失败的问题。

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