PDF Split is always needed by programmers and developers. It is very convenient to split a PDF file to multiple files by using online PDF split tools, you can split PDF in a page range as well as only extract a unique page. However, if you want to split a huge PDF document to hundreds of files, you have to try at least dozens of times, which, undoubtedly, takes too much time. Furthermore, when the network goes slowly, an error is likely to occur, sometimes, the file is reported to be damaged or corrupted. While using Spire.PDF for WPF, you can easily split huge PDF document up to hundreds of pages without any worry of the document safety in your WPF application.

By using Spire.PDF, you can achieve the effect as below:

Spire.PDF for WPF, as a WPF PDF component, allows users to create, read, write and manipulate PDF documents without using Adobe Acrobat or any third party component library. As for PDF split task, you can realize it by below methods:

doc.Split(pattern):

When splitting a PDF document to multiple PDF files, each PDF file is made of one page from the original PDF file. Split method works well since it can quickly split your PDF file and there is only one parameter passed to provide a template name of the destination PDF file.

String.Format(pattern, doc.Pages.Count - 1):

"String.Format" method provides great convenience for you to preview an existing file by returning the PDF file name that you want to process. The second parameter String.Format method is used to point out the index item which starts from 0.

The key step of PDF split task only requires four lines of code, before your start your PDF split project, please download Spirel.PDF for WPF first, then you can invoke the key code below to split any PDF you want.

        String pattern = "SplitDocument-{0}.pdf";
        doc.Split(pattern);
        String lastPageFileName= String.Format(pattern, doc.Pages.Count - 1);
        doc.Close();

	Dim pattern As String = "SplitDocument-{0}.pdf"
	doc.Split(pattern)
	Dim lastPageFileName As String = String.Format(pattern, doc.Pages.Count - 1)
	doc.Close()

Obviously, using this WPF PDF component, PDF can be split absolutely according to your requirements. Enjoy fast speed, high quality and free choices to build your application to split PDF right now.

OLE, short for Object Linking and Embedding, is a powerful technology integrated into Microsoft Word and other Microsoft Office applications. Its primary purpose is to seamlessly integrate objects from external programs directly into your documents. These objects can range from simple images or charts to more complex items like spreadsheets, presentations, multimedia files and more. In this article, we will demonstrate how to insert OLE objects as well as extract OLE objects in Word documents in C# using Spire.Doc for .NET.

• Insert OLE Objects in Word in C#
• Extract OLE Objects from Word in C#

Install Spire.Doc for .NET

To begin with, you need to add the DLL files included in the Spire.Doc 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.Doc

Insert OLE Objects in Word in C#

Spire.Doc for .NET offers the Paragraph.AppendOleObject(string pathToFile, DocPicture olePicture), OleObjectType type) method, which allows you to insert various types of documents (including Excel spreadsheets, PDF files, Word documents, PowerPoint presentations, and more) as OLE objects into a Word document.

The detailed steps are as follows:

• Create an instance of the Document class.
• Load a Word document using the Document.LoadFromFile() method.
• Get a specific section using the Document.Sections[index] property.
• Add a paragraph to the section using the Section.AddParagraph() method.
• Create an instance of the DocPicture class.
• Load an image that will be used as the icon of the embedded object using the DocPicture.LoadImage() method, and then set image width and height.
• Append an Excel spreadsheet as an OLE object to the paragraph using the Paragraph.AppendOleObject(string pathToFile, DocPicture olePicture, OleObjectType type) method.
• Repeat the above 4-7 steps to add more paragraphs and append more types of documents, like a PDF file, a PowerPoint presentation, and a Word document as OLE objects.
• Save the result file using the Document.SaveToFile() method.

using Spire.Doc;
using Spire.Doc.Documents;
using Spire.Doc.Fields;

namespace InsertOleObjects
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // Create an instance of the Document class
            Document doc = new Document();
            // Load a Word document
            doc.LoadFromFile("Example.docx");

            // Get the first section
            Section section = doc.Sections[0];

            // Add a paragraph to the section
            Paragraph para1 = section.AddParagraph();
            para1.AppendText("Excel File: ");
            // Load an image that will be used as the icon of the OLE object
            DocPicture picture1 = new DocPicture(doc);
            picture1.LoadImage("Excel-Icon.png");
            picture1.Width = 50;
            picture1.Height = 50;
            // Append an Excel spreadsheet to the paragraph as an OLE object
            para1.AppendOleObject("Budget.xlsx", picture1, OleObjectType.ExcelWorksheet);

            // Add a paragraph to the section
            Paragraph para2 = section.AddParagraph();
            para2.AppendText("PDF File: ");
            // Load an image that will be used as the icon of the OLE object
            DocPicture picture2 = new DocPicture(doc);
            picture2.LoadImage("PDF-Icon.png");
            picture2.Width = 50;
            picture2.Height = 50;
            // Append a PDF file to the paragraph as an OLE object
            para2.AppendOleObject("Report.pdf", picture2, OleObjectType.AdobeAcrobatDocument);

            // Add a paragraph to the section
            Paragraph para3 = section.AddParagraph();
            para3.AppendText("PPT File: ");
            // Load an image that will be used as the icon of the OLE object
            DocPicture picture3 = new DocPicture(doc);
            picture3.LoadImage("PPT-Icon.png");
            picture3.Width = 50;
            picture3.Height = 50;
            // Append a PowerPoint presentation to the paragraph as an OLE object
            para3.AppendOleObject("Plan.pptx", picture3, OleObjectType.PowerPointPresentation);

            // Add a paragraph to the section
            Paragraph para4 = section.AddParagraph();
            para4.AppendText("Word File: ");
            // Load an image that will be used as the icon of the OLE object
            DocPicture picture4 = new DocPicture(doc);
            picture4.LoadImage("Word-Icon.png");
            picture4.Width = 50;
            picture4.Height = 50;
            // Append a Word document to the paragraph as an OLE object
            para4.AppendOleObject("Introduction.docx", picture4, OleObjectType.WordDocument);

            doc.SaveToFile("InsertOLE.docx", FileFormat.Docx2013);
            doc.Close();
        }
    }
}

Extract OLE Objects from Word in C#

To extract OLE objects from a Word document, you need to locate the OLE objects within the document first. Once located, identify the file format of each OLE object. Finally, save the data of each OLE object to a file in its original format.

The detailed steps are as follows:

• Create an instance of the Document class.
• Load a Word document using the Document.LoadFromFile() method.
• Iterate through all sections of the document.
• Iterate through all child objects in the body of each section.
• Identify the paragraphs within each section.
• Iterate through the child objects in each paragraph.
• Locate the OLE object within the paragraph.
• Determine the file format of the OLE object.
• Save the data of the OLE object to a file in its native file format.

using Spire.Doc;
using Spire.Doc.Documents;
using Spire.Doc.Fields;
using System;

namespace InsertOrExtractOleObjects
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // Create an instance of the Document class
            Document doc = new Document();
            // Load a Word document
            doc.LoadFromFile("InsertOLE.docx");

            int i = 1;
            // Iterate through all sections of the Word document
            foreach (Section sec in doc.Sections)
            {
                // Iterate through all child objects in the body of each section
                foreach (DocumentObject obj in sec.Body.ChildObjects)
                {
                    // Check if the child object is a paragraph
                    if (obj is Paragraph par)
                    {
                        // Iterate through the child objects in the paragraph
                        foreach (DocumentObject o in par.ChildObjects)
                        {
                            // Check if the child object is an OLE object
                            if (o is DocOleObject ole)
                            {
                                string s = ole.ObjectType;
                                string ext = "";

                                // Check if the OLE object is a PDF file
                                if (s.StartsWith("AcroExch.Document"))
                                {
                                    ext = ".pdf";
                                }
                                // Check if the OLE object is an Excel spreadsheet
                                else if (s.StartsWith("Excel.Sheet"))
                                {
                                    ext = ".xlsx";
                                }
                                // Check if the OLE object is a PowerPoint presentation
                                else if (s.StartsWith("PowerPoint.Show"))
                                {
                                    ext = ".pptx";
                                }
                                // Check if the OLE object is a Word document
                                else if (s.StartsWith("Word.Document"))
                                {
                                    ext = ".docx";
                                }
                                else
                                {
                                    continue;
                                }

                                // Write the data of OLE into a file in its native format
                                using (var file = System.IO.File.OpenWrite($"Output/OLE{i}{ext}"))
                                {
                                    file.Write(ole.NativeData, 0, ole.NativeData.Length);
                                }

                                i++;
                            }
                        }
                    }
                }
            }

            doc.Close();
        }
    }
}

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.

Digital signature is more advanced and more popular to detect forgery and tampering today compared with traditional handwritten signature. Especially in business world, digital signature becomes an effective method to safeguard and authenticate your documents. As long as a digital signature is created and singed, the document has not been tampered and the recipients can view both the document version history and any changes that were made to it. Now, it is time to see how to create a PDF digital signature via a WPF PDF component Spire.PDF for WPF.

Spire.PDF for WPF, as a PDF component, enables you to create PDF digital signature in a simple way which can not only ensure your data information has not been altered since it was sent but also verify the signer's digital identity. The key procedure only requires six lines of code. Please preview the effective screenshot below, and then, view the key code.

Please feel free to Download Spire.PDF for WPF first before the key code below. In this solution, for constructing one instance of a Spire.Pdf.Sercurity.PdfCertificate class named cert, we reference a certificate file and its file protect password as parameters. Then, cert is applied to create an instance of a PdfSignature class we name it signature. Setting signature “page” parameter allows you to sign the digital signature of any PDF page. And DocumentPermissions, one property of signature, can be set: AllowComments, AllowFormFill and ForbidChanges.

Core Code:

String pfxPath = @"..\Data\Demo.pfx";
PdfCertificate cert = new PdfCertificate(pfxPath, "e-iceblue");
PdfSignature signature = new PdfSignature(doc, page, cert, "demo");
signature.ContactInfo = "Harry Hu";
signature.Certificated = true;
signature.DocumentPermissions = PdfCertificationFlags.AllowFormFill;

Dim pfxPath As String = "..\Data\Demo.pfx"
Dim cert As New PdfCertificate(pfxPath, "e-iceblue")
Dim signature As New PdfSignature(doc, page, cert, "demo")
signature.ContactInfo = "Harry Hu"
signature.Certificated = True
signature.DocumentPermissions = PdfCertificationFlags.AllowFormFill