Java: Encrypt or Decrypt PDF Files
For PDF documents that contain confidential or sensitive information, you may want to password protect these documents to ensure that only the designated person can access the information. This article will demonstrate how to programmatically encrypt a PDF document and decrypt a password-protected document using Spire.PDF for Java.
Install Spire.PDF for Java
First of all, you're required to add the Spire.Pdf.jar file as a dependency in your Java program. The JAR file can be downloaded from this link. If you use Maven, you can easily import the JAR file in your application by adding the following code to your project's pom.xml file.
<repositories>
<repository>
<id>com.e-iceblue</id>
<name>e-iceblue</name>
<url>https://repo.e-iceblue.com/nexus/content/groups/public/</url>
</repository>
</repositories>
<dependencies>
<dependency>
<groupId>e-iceblue</groupId>
<artifactId>spire.pdf</artifactId>
<version>12.3.9</version>
</dependency>
</dependencies>
Encrypt a PDF File with Password
There are two kinds of passwords for encrypting a PDF file - open password and permission password. The former is set to open the PDF file, while the latter is set to restrict printing, contents copying, commenting, etc. If a PDF file is secured with both types of passwords, it can be opened with either password.
The PdfDocument.getSecurity().encrypt(java.lang.String openPassword, java.lang.String permissionPassword, java.util.EnumSet<PdfPermissionsFlags> permissions, PdfEncryptionKeySize keySize) method offered by Spire.PDF for Java allows you to set both open password and permission password to encrypt PDF files. The detailed steps are as follows.
- Create a PdfDocument instance.
- Load a sample PDF file using PdfDocument.loadFromFile() method.
- Set open password, permission password, encryption key size and permissions.
- Encrypt the PDF file using PdfDocument.getSecurity().encrypt(java.lang.String openPassword, java.lang.String permissionPassword, java.util.EnumSet<PdfPermissionsFlags> permissions, PdfEncryptionKeySize keySize) method.
- Save the result file using PdfDocument.saveToFile () method.
- Java
import java.util.EnumSet;
import com.spire.pdf.PdfDocument;
import com.spire.pdf.security.PdfEncryptionKeySize;
import com.spire.pdf.security.PdfPermissionsFlags;
public class EncryptPDF {
public static void main(String[] args) {
// Input file path
String input = "data/encryption.pdf";
// Output file path
String output = "output/encryption_output.pdf";
// Create a new PDF document object
PdfDocument doc = new PdfDocument();
// Load the PDF document from the input file path
doc.loadFromFile(input);
// Create a password-based security policy with open and permission passwords
PdfSecurityPolicy securityPolicy = new PdfPasswordSecurityPolicy("openPwd", "permissionPwd");
// Set the encryption algorithm to AES 256-bit
securityPolicy.setEncryptionAlgorithm(PdfEncryptionAlgorithm.AES_256);
// Set document privilege to forbid all actions
securityPolicy.setDocumentPrivilege(PdfDocumentPrivilege.getForbidAll());
// Allow degraded printing
securityPolicy.getDocumentPrivilege().setAllowDegradedPrinting(true);
// Allow modification of annotations
securityPolicy.getDocumentPrivilege().setAllowModifyAnnotations(true);
// Allow document assembly
securityPolicy.getDocumentPrivilege().setAllowAssembly(true);
// Allow modification of document contents
securityPolicy.getDocumentPrivilege().setAllowModifyContents(true);
// Allow filling form fields
securityPolicy.getDocumentPrivilege().setAllowFillFormFields(true);
// Allow printing
securityPolicy.getDocumentPrivilege().setAllowPrint(true);
// Allow printing
doc.encrypt(securityPolicy);
// Save the encrypted document to the output file path
doc.saveToFile(output, FileFormat.PDF);
// Dispose of the document resources
doc.dispose();
}
}
Remove Password to Decrypt a PDF File
When you need to remove the password from a PDF file, you can set the open password and permission password to empty while calling the PdfDocument.getSecurity().encrypt(java.lang.String openPassword, java.lang.String permissionPassword, java.util.EnumSet<PdfPermissionsFlags> permissions, PdfEncryptionKeySize keySize, java.lang.String originalPermissionPassword) method. The detailed steps are as follows.
- Create a PdfDocument object.
- Load the encrypted PDF file with password using PdfDocument.loadFromFile(java.lang.String filename, java.lang.String password) method.
- Decrypt the PDF file by setting the open password and permission password to empty using PdfDocument.getSecurity().encrypt(java.lang.String openPassword, java.lang.String permissionPassword, java.util.EnumSet<PdfPermissionsFlags> permissions, PdfEncryptionKeySize keySize, java.lang.String originalPermissionPassword) method.
- Save the result file using PdfDocument.saveToFile() method.
- Java
import com.spire.pdf.PdfDocument;
import com.spire.pdf.security.PdfEncryptionKeySize;
import com.spire.pdf.security.PdfPermissionsFlags;
public class DecryptPDF {
public static void main(String[] args) throws Exception {
// Specify the input and output file paths
String input = "data/decryption.pdf";
String output = "output/decryption_result.pdf";
//load the pdf document.
PdfDocument doc = new PdfDocument();
doc.loadFromFile(input, "test");
//decrypt the document
doc.decrypt();
//save the file
doc.saveToFile(output, FileFormat.PDF);
// Close the PDF document to release resources
doc.close();
// Dispose of the PDF document to free up system resources
doc.dispose();
}
}
Apply for a Temporary License
If you'd like to remove the evaluation message from the generated documents, or to get rid of the function limitations, please request a 30-day trial license for yourself.
Get Paragraphs by Style Name in Word in C#, VB.NET
By using Spire.Doc, you can not only retrieve the style names of all paragraphs in a Word document, but also get the paragraphs with a specific style name. This is useful especially when you need to get the text in Title, Heading 1, Subtitle, etc.
| Paragraph Style Names in Word | Paragraph Style Names in Spire.Doc |
| Title | Title |
| Heading 1 | Heading1 |
| Heading 2 | Heading2 |
| Heading 3 | Heading3 |
| Heading 4 | Heading3 |
| Subtitle | Subtitle |
Step 1: Load a sample Word file when initializing the Document object.
Document doc = new Document("sample.docx");
Step 2: Traverse the sections and paragraphs in the document and determine if the paragraph style name is "Heading1", if so, write the paragraph text on screen.
foreach (Section section in doc.Sections)
{
foreach (Paragraph paragraph in section.Paragraphs)
{
if (paragraph.StyleName == "Heading1")
{
Console.WriteLine(paragraph.Text);
}
}
}
Output:
Full Code:
using Spire.Doc;
using Spire.Doc.Documents;
using System;
namespace GetParagh
{
class Program
{
static void Main(string[] args)
{
Document doc = new Document("sample.docx");
foreach (Section section in doc.Sections)
{
foreach (Paragraph paragraph in section.Paragraphs)
{
if (paragraph.StyleName == "Heading1")
{
Console.WriteLine(paragraph.Text);
}
}
}
}
}
}
Imports Spire.Doc
Imports Spire.Doc.Documents
Namespace GetParagh
Class Program
Private Shared Sub Main(args As String())
Dim doc As New Document("sample.docx")
For Each section As Section In doc.Sections
For Each paragraph As Paragraph In section.Paragraphs
If paragraph.StyleName = "Heading1" Then
Console.WriteLine(paragraph.Text)
End If
Next
Next
End Sub
End Class
End Namespace
Replace Bookmark with a Table in Word Documents in C#, VB.NET
Bookmarks are a great way to specify important locations on a Word document. Spire.Doc supports to access the bookmarks within the document and insert objects such as text, image and table at the bookmark location. This article will show you how to access a specific bookmark and replace the current bookmark content with a table.
Step 1: Load a template Word document.
Document doc = new Document(); doc.LoadFromFile(@"C:\Users\Administrator\Desktop\employee.docx");
Step 2: Create a Table object.
Table table = new Table(doc,true);
Step 3: Fill the table with sample data.
DataTable dt = new DataTable();
dt.Columns.Add("id", typeof(string));
dt.Columns.Add("name", typeof(string));
dt.Columns.Add("job", typeof(string));
dt.Columns.Add("email", typeof(string));
dt.Columns.Add("salary", typeof(string));
dt.Rows.Add(new string[] { "Emp_ID", "Name", "Job", "E-mail", "Salary" });
dt.Rows.Add(new string[] { "0241","Andrews", "Engineer", "andrews@outlook.com" ,"3.8K"});
dt.Rows.Add(new string[] { "0242","White", "Manager", "white@outlook.com","4.2K" });
dt.Rows.Add(new string[] { "0243","Martin", "Secretary", "martin@gmail.com", "3.5K" });
table.ResetCells(dt.Rows.Count, dt.Columns.Count);
for (int i = 0; i < dt.Rows.Count; i++)
{
for (int j = 0; j < dt.Columns.Count; j++)
{
table.Rows[i].Cells[j].AddParagraph().AppendText(dt.Rows[i][j].ToString());
}
}
Step 4: Get the specific bookmark by its name.
BookmarksNavigator navigator = new BookmarksNavigator(doc);
navigator.MoveToBookmark("bookmark_employee");
Step 5: Create a TextBodyPart instance and add the table to it.
TextBodyPart part = new TextBodyPart(doc); part.BodyItems.Add(table);
Step 6: Replace the current bookmark content with the TextBodyPart object.
navigator.ReplaceBookmarkContent(part);
Step 7: Save the file.
doc.SaveToFile("output.docx", FileFormat.Docx2013);
Result:
Full Code:
using Spire.Doc;
using Spire.Doc.Documents;
using System.Data;
namespace ReplaceBookmark
{
class Program
{
static void Main(string[] args)
{
Document doc = new Document();
doc.LoadFromFile(@"C:\Users\Administrator\Desktop\employee.docx");
Table table = new Table(doc, true);
DataTable dt = new DataTable();
dt.Columns.Add("id", typeof(string));
dt.Columns.Add("name", typeof(string));
dt.Columns.Add("job", typeof(string));
dt.Columns.Add("email", typeof(string));
dt.Columns.Add("salary", typeof(string));
dt.Rows.Add(new string[] { "Emp_ID", "Name", "Job", "E-mail", "Salary" });
dt.Rows.Add(new string[] { "0241", "Andrews", "Engineer", "andrews@outlook.com", "3.8K" });
dt.Rows.Add(new string[] { "0242", "White", "Manager", "white@outlook.com", "4.2K" });
dt.Rows.Add(new string[] { "0243", "Martin", "Secretary", "martin@gmail.com", "3.5K" });
table.ResetCells(dt.Rows.Count, dt.Columns.Count);
for (int i = 0; i < dt.Rows.Count; i++)
{
for (int j = 0; j < dt.Columns.Count; j++)
{
table.Rows[i].Cells[j].AddParagraph().AppendText(dt.Rows[i][j].ToString());
}
}
BookmarksNavigator navigator = new BookmarksNavigator(doc);
navigator.MoveToBookmark("bookmark_employee");
TextBodyPart part = new TextBodyPart(doc);
part.BodyItems.Add(table);
navigator.ReplaceBookmarkContent(part);
doc.SaveToFile("output.docx", FileFormat.Docx2013);
System.Diagnostics.Process.Start("output.docx");
}
}
}
Imports Spire.Doc
Imports Spire.Doc.Documents
Imports System.Data
Namespace ReplaceBookmark
Class Program
Private Shared Sub Main(args As String())
Dim doc As New Document()
doc.LoadFromFile("C:\Users\Administrator\Desktop\employee.docx")
Dim table As New Table(doc, True)
Dim dt As New DataTable()
dt.Columns.Add("id", GetType(String))
dt.Columns.Add("name", GetType(String))
dt.Columns.Add("job", GetType(String))
dt.Columns.Add("email", GetType(String))
dt.Columns.Add("salary", GetType(String))
dt.Rows.Add(New String() {"Emp_ID", "Name", "Job", "E-mail", "Salary"})
dt.Rows.Add(New String() {"0241", "Andrews", "Engineer", "andrews@outlook.com", "3.8K"})
dt.Rows.Add(New String() {"0242", "White", "Manager", "white@outlook.com", "4.2K"})
dt.Rows.Add(New String() {"0243", "Martin", "Secretary", "martin@gmail.com", "3.5K"})
table.ResetCells(dt.Rows.Count, dt.Columns.Count)
For i As Integer = 0 To dt.Rows.Count - 1
For j As Integer = 0 To dt.Columns.Count - 1
table.Rows(i).Cells(j).AddParagraph().AppendText(dt.Rows(i)(j).ToString())
Next
Next
Dim navigator As New BookmarksNavigator(doc)
navigator.MoveToBookmark("bookmark_employee")
Dim part As New TextBodyPart(doc)
part.BodyItems.Add(table)
navigator.ReplaceBookmarkContent(part)
doc.SaveToFile("output.docx", FileFormat.Docx2013)
System.Diagnostics.Process.Start("output.docx")
End Sub
End Class
End Namespace
Detect if a PDF file is PDF/A in C#
Spire.PDF provides developers two methods to detect if a PDF file is PDF/A. The one is to use PdfDocument.Conformance property, the other is to use PdfDocument.XmpMetaData property. The following examples demonstrate how we can detect if a PDF file is PDF/A using these two methods.
Below is the screenshot of the sample file we used for demonstration:
Using PdfDocument.Conformance
using Spire.Pdf;
using System;
namespace Detect
{
class Program
{
static void Main(string[] args)
{
//Initialize a PdfDocument object
PdfDocument pdf = new PdfDocument();
//Load the PDF file
pdf.LoadFromFile("Example.pdf");
//Get the conformance level of the PDF file
PdfConformanceLevel conformance = pdf.Conformance;
Console.WriteLine("This PDF file is " + conformance.ToString());
}
}
}
Output:
Create a Cross-Reference to Bookmark in Word in C#, VB.NET
A cross-reference refers to related information elsewhere in the same document. You can create cross-references to any existing items such as headings, footnotes, bookmarks, captions, and numbered paragraphs. This article will show you how to create a cross-reference to bookmark using Spire.Doc with C# and VB.NET.
Step 1: Create a Document instance.
Document doc = new Document(); Section section = doc.AddSection();
Step 2: Insert a bookmark.
Paragraph paragraph = section.AddParagraph();
paragraph.AppendBookmarkStart("MyBookmark");
paragraph.AppendText("Text inside a bookmark");
paragraph.AppendBookmarkEnd("MyBookmark");
Step 3: Create a cross-reference field, and link it to the bookmark through bookmark name.
Field field = new Field(doc); field.Type = FieldType.FieldRef; field.Code = @"REF MyBookmark \p \h";
Step 4: Add a paragraph, and insert the field to the paragraph.
paragraph = section.AddParagraph();
paragraph.AppendText("For more information, see ");
paragraph.ChildObjects.Add(field);
Step 5: Insert a FieldSeparator object to the paragraph, which works as separator in a field.
FieldMark fieldSeparator= new FieldMark(doc, FieldMarkType.FieldSeparator); paragraph.ChildObjects.Add(fieldSeparator);
Step 6: Set the display text of the cross-reference field.
TextRange tr = new TextRange(doc); tr.Text = "above"; paragraph.ChildObjects.Add(tr);
Step 7: Insert a FieldEnd object to the paragraph, which is used to mark the end of a field.
FieldMark fieldEnd = new FieldMark(doc, FieldMarkType.FieldEnd); paragraph.ChildObjects.Add(fieldEnd);
Step 8: Save to file.
doc.SaveToFile("output.docx", FileFormat.Docx2013);
Output:
The cross-reference appears as a link that takes the reader to the referenced item.
Full Code:
using Spire.Doc;
using Spire.Doc.Documents;
using Spire.Doc.Fields;
namespace CreatCR
{
class Program
{
static void Main(string[] args)
{
Document doc = new Document();
Section section = doc.AddSection();
//create a bookmark
Paragraph paragraph = section.AddParagraph();
paragraph.AppendBookmarkStart("MyBookmark");
paragraph.AppendText("Text inside a bookmark");
paragraph.AppendBookmarkEnd("MyBookmark");
//insert line breaks
for (int i = 0; i < 4; i++)
{
paragraph.AppendBreak(BreakType.LineBreak);
}
//create a cross-reference field, and link it to bookmark
Field field = new Field(doc);
field.Type = FieldType.FieldRef;
field.Code = @"REF MyBookmark \p \h";
//insert field to paragraph
paragraph = section.AddParagraph();
paragraph.AppendText("For more information, see ");
paragraph.ChildObjects.Add(field);
//insert FieldSeparator object
FieldMark fieldSeparator = new FieldMark(doc, FieldMarkType.FieldSeparator);
paragraph.ChildObjects.Add(fieldSeparator);
//set display text of the field
TextRange tr = new TextRange(doc);
tr.Text = "above";
paragraph.ChildObjects.Add(tr);
//insert FieldEnd object to mark the end of the field
FieldMark fieldEnd = new FieldMark(doc, FieldMarkType.FieldEnd);
paragraph.ChildObjects.Add(fieldEnd);
//save file
doc.SaveToFile("output.docx", FileFormat.Docx2013);
}
}
}
Imports Spire.Doc
Imports Spire.Doc.Documents
Imports Spire.Doc.Fields
Namespace CreatCR
Class Program
Private Shared Sub Main(args As String())
Dim doc As New Document()
Dim section As Section = doc.AddSection()
'create a bookmark
Dim paragraph As Paragraph = section.AddParagraph()
paragraph.AppendBookmarkStart("MyBookmark")
paragraph.AppendText("Text inside a bookmark")
paragraph.AppendBookmarkEnd("MyBookmark")
'insert line breaks
For i As Integer = 0 To 3
paragraph.AppendBreak(BreakType.LineBreak)
Next
'create a cross-reference field, and link it to bookmark
Dim field As New Field(doc)
field.Type = FieldType.FieldRef
field.Code = "REF MyBookmark \p \h"
'insert field to paragraph
paragraph = section.AddParagraph()
paragraph.AppendText("For more information, see ")
paragraph.ChildObjects.Add(field)
'insert FieldSeparator object
Dim fieldSeparator As New FieldMark(doc, FieldMarkType.FieldSeparator)
paragraph.ChildObjects.Add(fieldSeparator)
'set display text of the field
Dim tr As New TextRange(doc)
tr.Text = "above"
paragraph.ChildObjects.Add(tr)
'insert FieldEnd object to mark the end of the field
Dim fieldEnd As New FieldMark(doc, FieldMarkType.FieldEnd)
paragraph.ChildObjects.Add(fieldEnd)
'save file
doc.SaveToFile("output.docx", FileFormat.Docx2013)
End Sub
End Class
End Namespace
Highlight Duplicate and Unique Values in Excel Using C#
Using Excel conditional formatting, we can quickly find and highlight the duplicate and unique values in a selected cell range. In this article, we’re going to show you how to programmatically highlight duplicate and unique values with different colors using Spire.XLS and conditional formatting.
Detail steps:
Step 1: Initialize an object of Workbook class and Load the Excel file.
Workbook workbook = new Workbook();
workbook.LoadFromFile("Input.xlsx");
Step 2: Get the first worksheet.
Worksheet sheet = workbook.Worksheets[0];
Step 3: Use conditional formatting to highlight duplicate values in range "A2:A10" with IndianRed color.
XlsConditionalFormats xcfs1 = sheet.ConditionalFormats.Add(); xcfs1.AddRange(sheet.Range["A2:A10"]); IConditionalFormat format1 = xcfs1.AddCondition(); format1.FormatType = ConditionalFormatType.DuplicateValues; format1.BackColor = Color.IndianRed;
Step 4: Use conditional formatting to highlight unique values in range "A2:A10" with Yellow color.
IConditionalFormat format2 = xcfs1.AddCondition(); format2.FormatType = ConditionalFormatType.UniqueValues; format2.BackColor = Color.Yellow;"
Step 5: Save the file.
workbook.SaveToFile("HighlightDuplicates.xlsx", ExcelVersion.Version2013);
Screenshot:
Full code:
using Spire.Xls;
using Spire.Xls.Core;
using Spire.Xls.Core.Spreadsheet.Collections;
using System.Drawing;
namespace HighlightDuplicateandUniqueValues
{
class Program
{
static void Main(string[] args)
{
//Load the Excel file
Workbook workbook = new Workbook();
workbook.LoadFromFile("Input.xlsx");
//Get the first worksheet
Worksheet sheet = workbook.Worksheets[0];
//Use conditional formatting to highlight duplicate values in range "A2:A10" with IndianRed color
XlsConditionalFormats xcfs1 = sheet.ConditionalFormats.Add();
xcfs1.AddRange(sheet.Range["A2:A10"]);
IConditionalFormat format1 = xcfs1.AddCondition();
format1.FormatType = ConditionalFormatType.DuplicateValues;
format1.BackColor = Color.IndianRed;
//Use conditional formatting to highlight unique values in range "A2:A10" with Yellow color
IConditionalFormat format2 = xcfs1.AddCondition();
format2.FormatType = ConditionalFormatType.UniqueValues;
format2.BackColor = Color.Yellow;
//Save the file
workbook.SaveToFile("HighlightDuplicates.xlsx", ExcelVersion.Version2013);
}
}
}
Convert PDF to SVG with Custom Width and Height in C#, VB.NET
We've have demonstrated how to convert PDF page to SVG file format in the previous post. This guidance shows you how we can specify the width and height of output file using the latest version of Spire.PDF with C# and VB.NET.
Step 1: Load a sample PDF document to PdfDocument instance.
PdfDocument document = new PdfDocument();
document.LoadFromFile("pdf-sample.pdf");
Step 2: Specify the output file size through ConvertOptions.SetPdfToSvgOptions() method.
PdfToSvgConverter converter = new PdfToSvgConverter(inputFile);
converter.SvgOptions.ScaleX = (float)0.5;
converter.SvgOptions.ScaleY = (float)0.5;
converter.Convert(outputFile);
Step 3: Save PDF to SVG file format.
document.SaveToFile("result.svg", FileFormat.SVG);
Output:
Full Code:
using Spire.Pdf;
using Spire.Pdf.Conversion;
namespace ConvertPDFtoSVG
{
class Program
{
static void Main(string[] args)
{
PdfDocument document = new PdfDocument();
PdfToSvgConverter converter = new PdfToSvgConverter(inputFile);
converter.SvgOptions.ScaleX = (float)0.5;
converter.SvgOptions.ScaleY = (float)0.5;
converter.Convert(outputFile);
}
}
}
Imports Spire.Pdf
Imports Spire.Pdf.Conversion
Namespace ConvertPDFtoSVG
Class Program
Private Shared Sub Main(args As String())
Dim document As New PdfDocument()
document.LoadFromFile("pdf-sample.pdf")
' Specify the width And height of output SVG file
Dim Converter As New PdfToSvgConverter(inputFile)
Converter.SvgOptions.ScaleX = CSng(0.5)
Converter.SvgOptions.ScaleY = CSng(0.5)
Converter.Convert(outputFile)
document.SaveToFile("result.svg", FileFormat.SVG)
End Sub
End Class
End Namespace
How to toggle the visibility of PDF layer in C#
We have already demonstrated how to use Spire.PDF to add multiple layers to PDF file and delete layer in PDF in C#. We can also toggle the visibility of a PDF layer while creating a new page layer with the help of Spire.PDF. In this section, we're going to demonstrate how to toggle the visibility of layers in new PDF document in C#.
Step 1: Create a new PDF document and add a new page to the PDF document.
PdfDocument pdf = new PdfDocument(); PdfPageBase page = pdf.Pages.Add();
Step 2: Add a layer named "Blue line" to the PDF page and set the layer invisible.
PdfLayer layer = pdf.Layers.AddLayer(""Green line"", PdfVisibility.Off);
PdfPen pen = new PdfPen(Color.Green, 1f);
PdfCanvas pcA = layer.CreateGraphics(page.Canvas);
pcA.DrawLine(pen, new PointF(0, 30), new PointF(300, 30));
Step 3: Add a layer named "Ellipse" to the PDF page and set the layer visible.
layer = pdf.Layers.AddLayer(""Ellipse"", PdfVisibility.On);
PdfPen pen2 = new PdfPen(Color.Green, 1f);
PdfBrush brush2 = new PdfSolidBrush(Color.Green);
PdfCanvas pcB = layer.CreateGraphics(page.Canvas);
pcB.DrawEllipse(pen2, brush2, 50, 70, 200, 60);
Step 4: Save the document to file.
pdf.SaveToFile("LayerVisibility.pdf", FileFormat.PDF);
Effective screenshot after toggle the visibility of PDF layer:
Full codes:
using Spire.Pdf;
using Spire.Pdf.Graphics;
using System.Drawing;
namespace LayerVisibility
{
class Program
{
static void Main(string[] args)
{
PdfDocument pdf = new PdfDocument();
PdfPageBase page = pdf.Pages.Add();
PdfLayer layer = pdf.Layers.AddLayer("Green line", PdfVisibility.Off);
PdfPen pen = new PdfPen(Color.Green, 1f);
PdfCanvas pcA = layer.CreateGraphics(page.Canvas);
pcA.DrawLine(pen,new PointF(0, 30), new PointF(300, 30));
layer = pdf.Layers.AddLayer("Ellipse", PdfVisibility.On);
PdfPen pen2 = new PdfPen(Color.Green, 1f);
PdfBrush brush2 = new PdfSolidBrush(Color.Green);
PdfCanvas pcB = layer.CreateGraphics(page.Canvas);
pcB.DrawEllipse(pen2, brush2, 50, 70, 200, 60);
pdf.SaveToFile("LayerVisibility.pdf", FileFormat.PDF);
}
}
}
Remove conditional format from Excel in C#
With the help of Spire.XLS, we can set the conditional format the Excel cell in C# and VB.NET. We can also use Spire.XLS to remove the conditional format from a specific cell or the entire Excel worksheet. This article will demonstrate how to remove conditional format from Excel in C#.
Firstly, view the original Excel worksheet with conditional formats:
Step 1: Create an instance of Excel workbook and load the document from file.
Workbook workbook = new Workbook();
workbook.LoadFromFile("Sample.xlsx");
Step 2: Get the first worksheet from the workbook.
Worksheet sheet = workbook.Worksheets[0];
Step 3: Remove the first conditional format.
sheet.ConditionalFormats.RemoveAt(0);
Step 4: Remove all the conditional formats from the whole Excel worksheet.
for (int i = sheet.ConditionalFormats.Count-1; i >= 0; i--)
{
sheet.ConditionalFormats.RemoveAt(i);
}
Step 5: Save the document to file.
workbook.SaveToFile("Result.xlsx", ExcelVersion.Version2010);
Remove the conditional format from a special Excel range B2:
Remove all the conditional formats from the entire Excel worksheet:
Full codes of how to remove the conditional formats from Excel worksheet:
using Spire.Xls;
namespace RemoveConditionalFormat
{
class Program
{
static void Main(string[] args)
{
Workbook workbook = new Workbook();
workbook.LoadFromFile("Sample.xlsx");
Worksheet sheet = workbook.Worksheets[0];
// Remove the first conditional format
//sheet.ConditionalFormats.RemoveAt(0);
// Remove all conditional formats
for (int i = sheet.ConditionalFormats.Count-1; i >= 0; i--)
{
sheet.ConditionalFormats.RemoveAt(i);
}
workbook.SaveToFile("Result.xlsx", ExcelVersion.Version2010);
}
}
}
C#: Convert PDF to HTML
PDF documents have been a popular choice for sharing information due to their cross-platform compatibility and ability to preserve the original layout and formatting. However, as the web continues to evolve, there is an increasing demand for content that can be easily integrated into websites and other online platforms. In this context, converting PDF to HTML format has become highly valuable. By converting PDF files to more flexible and accessible HTML, users gain the ability to better utilize, share, and reuse PDF-based information within the web environment. In this article, we will demonstrate how to convert PDF files to HTML format in C# using Spire.PDF for .NET.
- Convert PDF to HTML in C#
- Set Conversion Options When Converting PDF to HTML in C#
- Convert PDF to HTML Stream in C#
Install Spire.PDF for .NET
To begin with, you need to add the DLL files included in the Spire.PDF for.NET package as references in your .NET project. The DLL files can be either downloaded from this link or installed via NuGet.
PM> Install-Package Spire.PDF
Convert PDF to HTML in C#
To convert a PDF document to HTML format, you can use the PdfDocument.SaveToFile(string fileName, FileFormat.HTML) method provided by Spire.PDF for .NET. The detailed steps are as follows.
- Create an instance of the PdfDocument class.
- Load a PDF document using the PdfDocument.LoadFromFile(string fileName) method.
- Save the PDF document to HTML format using the PdfDocument.SaveToFile(string fileName, FileFormat.HTML) method.
- C#
using Spire.Pdf;
namespace ConvertPdfToHtml
{
internal class Program
{
static void Main(string[] args)
{
// Create an instance of the PdfDocument class
PdfDocument doc = new PdfDocument();
// Load a PDF document
doc.LoadFromFile("Sample.pdf");
// Save the PDF document to HTML format
doc.SaveToFile("PdfToHtml.html", FileFormat.HTML);
doc.Close();
}
}
}
Set Conversion Options When Converting PDF to HTML in C#
The PdfConvertOptions.SetPdfToHtmlOptions() method allows you to customize the conversion options when transforming PDF files to HTML. This method takes several parameters that you can use to configure the conversion process, such as:
- useEmbeddedSvg (bool): Indicates whether to embed SVG in the resulting HTML file.
- useEmbeddedImg (bool): Indicates whether to embed images in the resulting HTML file. This option is applicable only when useEmbeddedSvg is set to false.
- maxPageOneFile (int): Specifies the maximum number of pages to be included per HTML file. This option is applicable only when useEmbeddedSvg is set to false.
- useHighQualityEmbeddedSvg (bool): Indicates whether to use high-quality embedded SVG in the resulting HTML file. This option is applicable when useEmbeddedSvg is set to true.
The following steps explain how to customize the conversion options when transforming a PDF to HTML using Spire.PDF for .NET.
- Create an instance of the PdfDocument class.
- Load a PDF document using the PdfDocument.LoadFromFile(string fileName) method.
- Get the PdfConvertOptions object using the PdfDocument.ConvertOptions property.
- Set the PDF to HTML conversion options using PdfConvertOptions.SetPdfToHtmlOptions(bool useEmbeddedSvg, bool useEmbeddedImg, int maxPageOneFile, bool useHighQualityEmbeddedSvg) method.
- Save the PDF document to HTML format using PdfDocument.SaveToFile(string fileName, FileFormat.HTML) method.
- C#
using Spire.Pdf;
namespace ConvertPdfToHtmlWithCustomOptions
{
internal class Program
{
static void Main(string[] args)
{
// Create an instance of the PdfDocument class
PdfDocument doc = new PdfDocument();
// Load a PDF document
doc.LoadFromFile("Sample.pdf");
// Set the conversion options to embed images in the resulting HTML and limit one page per HTML file
PdfConvertOptions pdfToHtmlOptions = doc.ConvertOptions;
pdfToHtmlOptions.SetPdfToHtmlOptions(false, true, 1);
// Save the PDF document to HTML format
doc.SaveToFile("PdfToHtmlWithCustomOptions.html", FileFormat.HTML);
doc.Close();
}
}
}
Convert PDF to HTML Stream in C#
Instead of saving a PDF document to an HTML file, you can save it to an HTML stream by using the PdfDocument.SaveToStream(Stream stream, FileFormat.HTML) method. The detailed steps are as follows.
- Create an instance of the PdfDocument class.
- Load a PDF document using the PdfDocument.LoadFromFile(string fileName) method.
- Create an instance of the MemoryStream class.
- Save the PDF document to an HTML stream using the PdfDocument.SaveToStream(Stream stream, FileFormat.HTML) method.
- C#
using Spire.Pdf;
using System.IO;
namespace ConvertPdfToHtmlStream
{
internal class Program
{
static void Main(string[] args)
{
// Create an instance of the PdfDocument class
PdfDocument doc = new PdfDocument();
// Load a PDF document
doc.LoadFromFile("Sample.pdf");
// Save the PDF document to HTML stream
using (var fileStream = new MemoryStream())
{
doc.SaveToStream(fileStream, FileFormat.HTML);
// You can now do something with the HTML stream, such as Write it to a file
using (var outputFile = new FileStream("PdfToHtmlStream.html", FileMode.Create))
{
fileStream.Seek(0, SeekOrigin.Begin);
fileStream.CopyTo(outputFile);
}
}
doc.Close();
}
}
}
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