Updated sample code for live editor

Digital Signature/Digital-Signature-Validation/.NET/Digital-Signature-Validation/Digital-Signature-Validation.csproj

@@ -12,4 +12,22 @@
     <PackageReference Include="Syncfusion.Pdf.Net.Core" Version="*" />
   </ItemGroup>
 
+  <ItemGroup>
+    <None Update="Data\Input.pdf">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="Data\Intermediate0.cer">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="Data\Intermediate1.cer">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="Data\Root.cer">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="Output\gitkeep.txt">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
 </Project>

Digital Signature/Digital-Signature-Validation/.NET/Digital-Signature-Validation/Program.cs

@@ -3,44 +3,31 @@
 using System.Security.Cryptography.X509Certificates;
 using System.Text;
 
-string dataPath = Path.GetFullPath(@"Data/");
-
-// Load signed PDF document
+//Open the signed PDF document.
 using PdfLoadedDocument ldoc = new PdfLoadedDocument(Path.GetFullPath(@"Data/Input.pdf"));
-
-// Get signature field
+//Retrieve the signature field from the document form.
 PdfLoadedSignatureField lSigFld = ldoc.Form.Fields[0] as PdfLoadedSignatureField;
-
-// Root and Intermediate Certificates
+//Create a collection to store the root and intermediate certificates.
 X509CertificateCollection collection = new X509CertificateCollection();
-
 string[] certificates =
 {
     "Root.cer",
     "Intermediate0.cer",
     "Intermediate1.cer"
 };
-
+//Load certificates and add them to the certificate collection.
 foreach (string certFile in certificates)
 {
-    byte[] certData = File.ReadAllBytes(Path.Combine(dataPath, certFile));
-
-    X509Certificate2 certificate = new X509Certificate2(certData);
-
-    collection.Add(certificate);
+    collection.Add(new X509Certificate2(File.ReadAllBytes(Path.GetFullPath(@"Data/" + certFile))));
 }
-
-// Validate signature
+//Verify the digital signature using the certificate chain.
 PdfSignatureValidationResult result = lSigFld.ValidateSignature(collection);
-
 StringBuilder builder = new StringBuilder();
-
 builder.AppendLine("Signature is " + result.SignatureStatus);
 builder.AppendLine();
 builder.AppendLine("----------Validation Summary----------");
 builder.AppendLine();
-
-// Modified check
+//Check whether the signed document has been modified.
 if (result.IsDocumentModified)
 {
     builder.AppendLine("The document has been altered or corrupted since the signature was applied.");
@@ -49,64 +36,49 @@
 {
     builder.AppendLine("The document has not been modified since the signature was applied.");
 }
-
-// Certificate details
+//Add signer certificate information to the report.
 builder.AppendLine("Digitally signed by: " + lSigFld.Signature.Certificate.IssuerName);
-
 builder.AppendLine("Valid From: " + lSigFld.Signature.Certificate.ValidFrom);
-
 builder.AppendLine("Valid To: " + lSigFld.Signature.Certificate.ValidTo);
-
 builder.AppendLine("Signature Algorithm: " + result.SignatureAlgorithm);
-
 builder.AppendLine("Hash Algorithm: " + result.DigestAlgorithm);
-
-// Revocation details
+//Include revocation status details.
 builder.AppendLine("OCSP Revocation Status: " + result.RevocationResult.OcspRevocationStatus);
-
 if (result.RevocationResult.OcspRevocationStatus == RevocationStatus.None && result.RevocationResult.IsRevokedCRL)
 {
     builder.AppendLine("CRL is revoked.");
 }
-
 builder.AppendLine();
 builder.AppendLine("--------Revocation Information---------");
 builder.AppendLine();
-
+//Extract OCSP and CRL validation details for each signer certificate.
 foreach (PdfSignerCertificate signerCertificate in result.SignerCertificates)
 {
     if (signerCertificate.OcspCertificate != null)
     {
         builder.AppendLine("------------OCSP Certificate-------------");
-
         foreach (X509Certificate2 item in signerCertificate.OcspCertificate.Certificates)
         {
             builder.AppendLine("The OCSP Response was signed by: " + item.SubjectName.Name);
         }
-
         builder.AppendLine("Is Embedded: " + signerCertificate.OcspCertificate.IsEmbedded);
-
         builder.AppendLine("Valid From: " + signerCertificate.OcspCertificate.ValidFrom);
-
         builder.AppendLine("Valid To: " + signerCertificate.OcspCertificate.ValidTo);
-
         builder.AppendLine();
     }
 
     if (signerCertificate.CrlCertificate != null)
     {
         builder.AppendLine("------------CRL Certificate--------------");
-
         foreach (X509Certificate2 item in signerCertificate.CrlCertificate.Certificates)
         {
             builder.AppendLine("The CRL was signed by: " + item.SubjectName.Name);
         }
-
         builder.AppendLine("Is Embedded: " + signerCertificate.CrlCertificate.IsEmbedded);
         builder.AppendLine("Valid From: " + signerCertificate.CrlCertificate.ValidFrom);
         builder.AppendLine("Valid To: " + signerCertificate.CrlCertificate.ValidTo);
         builder.AppendLine();
     }
 }
-//Save to file
-File.WriteAllText(Path.GetFullPath(@"Output/Output.txt"),builder.ToString());
+//Write the validation report to a text file.
+File.WriteAllText(Path.GetFullPath(@"Output/Output.txt"), builder.ToString());

Digital Signature/Multiple-digital-signature/.NET/Multiple-digital-signature/Program.cs

@@ -5,57 +5,39 @@
 
 // Open the existing PDF document.
 PdfLoadedDocument loadedDocument = new PdfLoadedDocument(Path.GetFullPath(@"Data/SignatureFields.pdf"));
-
 // Retrieve the first page from the PDF document.
 PdfLoadedPage page = loadedDocument.Pages[0] as PdfLoadedPage;
-
 // Access the first signature field available in the PDF form.
 PdfLoadedSignatureField signatureField1 = loadedDocument.Form.Fields[0] as PdfLoadedSignatureField;
-
 // Create a certificate object using the PFX file and its password.
 PdfCertificate certificate1 = new PdfCertificate(Path.GetFullPath(@"Data/PDF.pfx"), "syncfusion");
-
 // Digitally sign the first signature field.
 signatureField1.Signature = new PdfSignature(loadedDocument, page, certificate1, "Signature1", signatureField1);
-
 // Load the signature image for the first signer.
 FileStream imageStream1 = new FileStream(Path.GetFullPath(@"Data/Student Signature.jpg"), FileMode.Open, FileAccess.Read);
-
 PdfBitmap signatureImage = new PdfBitmap(imageStream1);
-
-
 // Render the signature image within the signature field appearance.
 signatureField1.Signature.Appearance.Normal.Graphics.DrawImage(signatureImage, 0, 0, signatureField1.Bounds.Width, signatureField1.Bounds.Height);
-
 // Save the signed PDF into a memory stream.
 MemoryStream stream = new MemoryStream();
 loadedDocument.Save(stream);
-
 // Close the original PDF document instance.
 loadedDocument.Close(true);
 
 // Reopen the partially signed PDF from the memory stream.
 PdfLoadedDocument signedDocument = new PdfLoadedDocument(stream);
-
 // Retrieve the first page of the signed document.
 PdfLoadedPage loadedPage = signedDocument.Pages[0] as PdfLoadedPage;
-
 // Access the second signature field in the PDF form.
 PdfLoadedSignatureField signatureField2 = signedDocument.Form.Fields[1] as PdfLoadedSignatureField;
-
 // Apply a digital signature to the second signature field.
 signatureField2.Signature = new PdfSignature(signedDocument, loadedPage, certificate1, "Signature2", signatureField2);
-
 // Load the signature image for the second signer.
 FileStream imageStream2 = new FileStream(Path.GetFullPath(@"Data/Teacher Signature.png"), FileMode.Open, FileAccess.Read);
-
 PdfBitmap signatureImage1 = new PdfBitmap(imageStream2);
-
 // Display the signature image in the second signature field appearance.
 signatureField2.Signature.Appearance.Normal.Graphics.DrawImage(signatureImage1, 0, 0, signatureField2.Bounds.Width, signatureField2.Bounds.Height);
-
 // Save the fully signed PDF document.
 signedDocument.Save(Path.GetFullPath(@"Output/Output.pdf"));
-
 // Close the signed PDF document.
 signedDocument.Close(true);

OCR/.NET/Perform-OCR-on-PDF-with-multiple-languages/Perform-OCR-on-PDF-with-multiple-languages/Perform-OCR-on-PDF-with-multiple-languages.csproj

@@ -12,4 +12,34 @@
     <PackageReference Include="Syncfusion.PDF.OCR.Net.Core" Version="*" />
   </ItemGroup>
 
+  <ItemGroup>
+    <None Update="Data\ARIALUNI.ttf">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="Data\Input.pdf">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="Output\gitkeep.txt">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="Tessdata\ara.traineddata">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="Tessdata\deu.traineddata">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="Tessdata\ell.traineddata">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="Tessdata\eng.traineddata">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="Tessdata\fra.traineddata">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="Tessdata\grc.traineddata">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
 </Project>

OCR/.NET/Perform-OCR-on-PDF-with-multiple-languages/Perform-OCR-on-PDF-with-multiple-languages/Program.cs

@@ -2,19 +2,19 @@
 using Syncfusion.Pdf.Graphics;
 using Syncfusion.Pdf.Parsing;
 
-// Load the PDF document
+//Open the existing PDF document.
 using (PdfLoadedDocument loadedDocument = new PdfLoadedDocument(Path.GetFullPath(@"Data/Input.pdf")))
 {
-    // Initialize OCR processor
+    //Create an OCR processor instance.
     OCRProcessor processor = new OCRProcessor();
-    //Sets Unicode font to preserve the Unicode characters in a PDF document.
+    //Assign a Unicode font to retain multilingual characters in the OCR output PDF.
     processor.UnicodeFont = new PdfTrueTypeFont(Path.GetFullPath(@"Data/ARIALUNI.ttf"), 8);
-    // Set OCR language
+    //Specify the languages to be recognized during OCR processing.
     processor.Settings.Language = "eng+deu+ara+ell+fra"; // English, German, Arabic, Greek, French
-    // Set the path to the Tesseract language data folder
+    //Set the directory containing Tesseract language data files.
     processor.TessDataPath = Path.GetFullPath(@"Tessdata");
-    // Perform OCR
+    //Run OCR on the PDF document and make its content searchable.
     processor.PerformOCR(loadedDocument);
-    // Save the PDF document
+    //Save the OCR-processed PDF to the output location.
     loadedDocument.Save(Path.GetFullPath(@"Output/Output.pdf"));
 }

OCR/.NET/Perform-OCR-on-image-file/Perform-OCR-on-image-file/Perform-OCR-on-image-file.csproj

@@ -13,9 +13,6 @@
   </ItemGroup>
 
   <ItemGroup>
-    <None Update="Data\ARIALUNI.TTF">
-      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
-    </None>
     <None Update="Data\Input.jpg">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>

OCR/.NET/Perform-OCR-on-image-file/Perform-OCR-on-image-file/Program.cs

@@ -1,22 +1,14 @@
 using Syncfusion.OCRProcessor;
-using Syncfusion.Pdf.Graphics;
 
-//Initialize the OCR processor by providing the path of the tesseract binaries.
+//Create an OCR processor instance.
 using (OCRProcessor processor = new OCRProcessor())
 {
-    //Get stream from the image file.
+    //Open the input image as a file stream.
     FileStream stream = new FileStream(Path.GetFullPath(@"Data/Input.jpg"), FileMode.Open);
-
-    //Set OCR language to process.
+    //Specify English as the language for text recognition.
     processor.Settings.Language = Languages.English;
-
-    //Sets Unicode font to preserve the Unicode characters in a PDF document.
-    FileStream fontStream = new FileStream(Path.GetFullPath(@"Data/ARIALUNI.ttf"), FileMode.Open);
-
-    processor.UnicodeFont = new PdfTrueTypeFont(fontStream, 8);
-
-    //Perform the OCR process for an image steam.
+    //Extract text from the image using the OCR engine and tessdata path.
     string ocrText = processor.PerformOCR(stream, processor.TessDataPath);
-
-    System.IO.File.WriteAllText(Path.GetFullPath(@"Output/Output.txt"), ocrText);  
+    //Save the recognized text to a text file.
+    File.WriteAllText(Path.GetFullPath(@"Output/Output.txt"), ocrText);
 }