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Thursday, 09 March 2023 07:53

C#/VB.NET: Extract Images from PowerPoint Presentations

Images are one of the most common elements in PowerPoint presentations. There may be times when you need to extract images from specific presentation slides or from an entire presentation, for example, when you want to reuse those images in another presentation. In this article, you will learn how to extract images from PowerPoint presentations in C# and VB.NET using Spire.Presentation for .NET library.

Extract Images from an Entire Presentation in C# and VB.NET
Extract Images from a Specific Presentation Slide in C# and VB.NET

Install Spire.Presentation for .NET

To begin with, you need to add the DLL files included in the Spire.Presentation for.NET package as references in your .NET project. The DLL files can be either downloaded from this link or installed via NuGet.

Package Manager

PM> Install-Package Spire.Presentation

Extract Images from an Entire Presentation in C# and VB.NET

To extract images from an entire PowerPoint presentation, you need to use the Presentation.Images property to get the collection of all the images in the presentation, then iterate through the collection and call ImageCollection[int].Image.Save() method to save each image to an image file. The following are the detailed steps:

Initialize an instance of the Presentation class.
Load a PowerPoint presentation using Presentation.LoadFromFile() method.
Get the collection of all the images in the presentation through Presentation.Images property.
Iterate through the collection, and call ImageCollection[int].Image.Save() method to save the images in the collection to image files.

C#
VB.NET

using Spire.Presentation;
using Spire.Presentation.Collections;
using System.Drawing;

namespace ExtractImagesFromPresentation
{
    internal class Program
    {
        static void Main(string[] args)
        {
            //Initialize an instance of the Presentation class
            Presentation ppt = new Presentation();
            //Load a PowerPoint presentation
            ppt.LoadFromFile(@"Template.pptx");

            //Get the image collection of the presentation
            ImageCollection imageCollection = ppt.Images;

            //Iterate through the images in the collection
            for (int i = 0; i < imageCollection.Count; i++)
            {
                //Extract the images 
                imageCollection[i].Image.Save(string.Format(@"Presentation\Images{0}.png", i));
            }

            ppt.Dispose();
        }
    }
}

C#/VB.NET: Extract Images from PowerPoint Presentations

Extract Images from a Specific Presentation Slide in C# and VB.NET

To extract images from a specific slide, you need to iterate through all shapes on the slide, find the shapes that are of SlidePicture or PictureShape type, then use the SlidePicture.PictureFill.Picture.EmbedImage.Image.Save() or PictureShape.EmbedImage.Image.Save() method to save the images to image files. The following are the detailed steps:

Initialize an instance of the Presentation class.
Load a PowerPoint presentation using Presentation.LoadFromFile() method.
Get a specific slide by its index through Presentation.Slides[int] property.
Iterate through all shapes on the slide.
Check if the shapes are of SlidePicture or PictureShape type. If the result is true, save the images to image files using SlidePicture.PictureFill.Picture.EmbedImage.Image.Save() or PictureShape.EmbedImage.Image.Save() method.

C#
VB.NET

using Spire.Presentation;

namespace ExtractImagesFromSlide
{
    internal class Program
    {
        static void Main(string[] args)
        {
            //Initialize an instance of the Presentation class
            Presentation ppt = new Presentation();
            //Load a PowerPoint presentation
            ppt.LoadFromFile(@"Template4.pptx");

            //Get the first slide
            ISlide slide = ppt.Slides[0];

            int i = 0;
            //Iterate through all shapes on the first slide
            foreach (IShape s in slide.Shapes)
            {
                //Check if the shape is of SlidePicture type
                if (s is SlidePicture)
                {
                    //Extract the image
                    SlidePicture ps = s as SlidePicture;
                    ps.PictureFill.Picture.EmbedImage.Image.Save(string.Format(@"Slide\Images{0}.png", i));
                    i++;
                }
                //Check if the shape is of PictureShape type
                if (s is PictureShape)
                {
                    //Extract the image
                    PictureShape ps = s as PictureShape;
                    ps.EmbedImage.Image.Save(string.Format(@"Slide\Images{0}.png", i));
                    i++;
                }
            }
        }
    }
}

C#/VB.NET: Extract Images from PowerPoint Presentations

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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.

Published in Image and Shapes

Tagged under

ppt net Image Shapes

Friday, 02 September 2022 07:55

C#/VB.NET: Insert Superscripts and Subscripts into Word

Superscripts or subscripts are characters positioned slightly above or below the normal line of text. They are commonly used in scientific formulas such as mathematical equations or chemical expressions. If you are creating a document containing scientific formulas, you most likely need to insert superscripts or subscripts. In this article, we will demonstrate how to insert superscripts and subscripts into Word in C# and VB.NET using Spire.Doc for .NET library.

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.

Package Manager

PM> Install-Package Spire.Doc

Insert Superscripts and Subscripts into Word using C# and VB.NET

The following are the main steps to insert a superscript or subscript into a Word document using Spire.Doc for .NET:

Create a Document instance.
Load a Word document using Document.LoadFromFile() method.
Get the specific section through Document.Sections[sectionIndex] property.
Add a paragraph to the section using Section.AddParagraph() method.
Add normal text to the paragraph using Paragraph.AppendText() method.
Add superscript or subscript text to the paragraph using Paragraph.AppendText() method.
Apply superscript or subscript formatting to the superscript or subscript text through TextRange.CharacterFormat.SubSuperScript property.
Save the result document using Document.SaveToFile() method.

C#
VB.NET

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

namespace InsertSuperscriptAndSubscript
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a Document instance
            Document document = new Document();
            //Load a Word document
            document.LoadFromFile("Sample.docx");

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

            //Add a paragraph to the section
            Paragraph paragraph = section.AddParagraph();

            //Add normal text to the paragraph
            paragraph.AppendText("E = mc");
            //Add superscript text to the paragraph
            TextRange superscriptText = paragraph.AppendText("2");
            //Apply superscript formatting to the superscript text
            superscriptText.CharacterFormat.SubSuperScript = SubSuperScript.SuperScript;

            //Start a new line
            paragraph.AppendBreak(BreakType.LineBreak);

            //Add normal text to the paragraph
            paragraph.AppendText("H");
            //Add subscript text to the paragraph
            TextRange subscriptText = paragraph.AppendText("2");
            //Apply subscript formatting to the subscript text
            subscriptText.CharacterFormat.SubSuperScript = SubSuperScript.SubScript;
            //Add normal text to the paragraph
            paragraph.AppendText("O");

            //Set font size for the text in the paragraph
            foreach (var item in paragraph.Items)
            {
                if (item is TextRange)
                {
                    TextRange textRange = item as TextRange;
                    textRange.CharacterFormat.FontSize = 36f;
                }
            }

            //Save the result document
            document.SaveToFile("InsertSuperscriptAndSubscript.docx", FileFormat.Docx2013);
        }
    }
}

C#/VB.NET: Insert Superscripts and Subscripts into Word

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.

Published in Others

Tagged under

doc net Others

Thursday, 29 May 2014 02:12

How to Remove Slides from a Presentation

Sometimes, we may need to delete specific slide in a PowerPoint presentation due to any reason. This section will illustrate that how we can accomplish that task using Spire.Presentation for .NET.

As a matter of fact, it is quite easy and convenient to remove slides by only one line of core code if you have Spire.Presentation.Dll installed as a reference in your .NET project assemblies. Here is the method:

Step 1: Create an instance of presentation class and load PPT documents

Presentation presentation = new Presentation();
presentation.LoadFromFile("sample.pptx");

Step 2: Remove the second slide from the presentation by using its index position

presentation.Slides.RemoveAt(1);

Step 3: Save and review

presentation.SaveToFile("result.pptx",FileFormat.Pptx2010);
System.Diagnostics.Process.Start("result.pptx");

Original layout:

Remove Slides from a Presentation

Result:

Remove Slides from a Presentation

Full C# code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Spire.Presentation;

namespace RemoveSlide
{
    class Program
    {
        static void Main(string[] args)
        {
            Presentation presentation = new Presentation();
            presentation.LoadFromFile("sample.pptx");

            //remove the second slide
            presentation.Slides.RemoveAt(1);

             presentation.SaveToFile("result.pptx",FileFormat.Pptx2010);
            System.Diagnostics.Process.Start("result.pptx");
        }
    }
}

Published in Document Operation

Tagged under

ppt net Document Operation

Tuesday, 27 May 2014 08:40

Delete Annotation from PDF files in C#

Text annotation is often used in PDF file to show readers the extra information of the item. By using Spire.PDF you can not only add a new annotation, edit an existing annotation, but also delete annotations from PDF file. In this article, we will introduce you how to delete a particular annotation and delete all the annotation at one time.

First, check the PDF document with annotations.

Delete Annotation from PDF files in C#

Here comes to the steps of how to remove the bookmarks in C#.

Download Spire.PDF for .NET and install it correctly. The Spire.PDF installation is clean, professional and wrapped up in a MSI installer.
Add Spire.Pdf.dll as reference in the downloaded Bin folder though the below path: "..\Spire.Pdf\Bin\NET4.0\ Spire.Pdf.dll".
Check the code snippet of how to delete the annotations. With Spire.PDF.NET, we can remove both the particular annotation and remove all the annotations.

The code snippet of remove the first annotation from PDF file:

PdfDocument document = new PdfDocument();
//load the pdf file
document.LoadFromFile("E-iceblue.pdf");

//remove the first annotation
document.Pages[0].Annotations.RemoveAt(1);

document.SaveToFile("result.pdf");
System.Diagnostics.Process.Start("result.pdf");

The effective screenshot of remove the first annotation:

Delete Annotation from PDF files in C#

The code snippet of remove all annotations from PDF file:

PdfDocument document = new PdfDocument();
//load the pdf file
document.LoadFromFile("E-iceblue.pdf");

//remove all annotations
document.Pages[0].Annotations.Clear();

document.SaveToFile("result.pdf");
System.Diagnostics.Process.Start("result.pdf");

The effective screenshot of remove all the annotations:

Delete Annotation from PDF files in C#

Published in Annotation

Tagged under

pdf net Annotation

Monday, 26 May 2014 02:47

How to add Controls to Toolbox in C#

In this document, I will introduce you how to add Spire. Barcode controls to Toolbox for Windows Forms application.

If you have already installed Spire.Barcode, you can add controls this way:

"Start" → "Programs" → "e-iceblue" → "Spire.Barcode": Click "Add Controls into VS Toolbox".