Convert PowerPoint to Image in Xamarin

3 Aug 20265 minutes to read

Syncfusion^® PowerPoint is a .NET PowerPoint library used to create, read, edit and convert PowerPoint presentation programmatically without Microsoft PowerPoint or interop dependencies. Using this library, you can convert a PowerPoint to an image in Xamarin.

Steps to convert PowerPoint to Image programmatically

Step 1: Create a new C# Xamarin.Forms application project.

Step 2: Select a project template and required platforms to deploy the application. In this application the portable assemblies to be shared across multiple platforms, the .NET Standard code sharing strategy has been selected. For more details about code sharing refer here.

Step 3: Install Syncfusion.Xamarin.PresentationRenderer NuGet package as a reference to the .NET Standard project in your Xamarin applications from NuGet.org.

NOTE

Starting with v16.2.0.x, if you reference Syncfusion assemblies from trial setup or from the NuGet feed, you also have to add “Syncfusion.Licensing” assembly reference and include a license key in your projects. Please refer to this link to know about registering Syncfusion^® license key in your application to use our components.

Step 4: Add a new Forms XAML page in the portable project if no XAML page is defined in the App class. Otherwise, proceed to the next step.

• To add the new XAML page, right click on the project and select Add > New Item and add a Forms XAML Page from the list. Name it as MainXamlPage.
• In App class of portable project (App.cs), replace the existing constructor of App class with the code snippet given below which invokes the MainXamlPage.

C#

public App()
{
  // The root page of your application
  MainPage = new MainXamlPage();
}

Step 5: In the MainXamlPage.xaml add new button as shown below.

XAML

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="Convert_PowerPoint_Presentation_to_Image.MainPage">
    <StackLayout VerticalOptions="Center">
        <Button Text="Convert PPTXtoImage" Clicked="OnButtonClicked" HorizontalOptions="Center"/>
    </StackLayout>
</ContentPage>

Step 6: Include the following namespaces in the MainXamlPage.xaml.cs file.

C#

using System.IO;
using System.Reflection;
using Syncfusion.Presentation;
using Syncfusion.PresentationRenderer;
using Xamarin.Forms;

Step 7: Include the below code snippet in the click event of the button in MainXamlPage.xaml.cs, to convert a PowerPoint to an image in Xamarin. The PresentationRenderer performs the slide-to-image conversion and the ISave service (defined in the helper files below) saves the resulting image to the device.

Step 8: Register the platform-specific ISave implementation using DependencyService so it can be resolved at runtime. Add the appropriate attribute above the namespace declaration in each platform-specific helper file:

• iOS (SaveIOS.cs): [assembly: Dependency(typeof(SaveIOS))]
• Android (SaveAndroid.cs): [assembly: Dependency(typeof(SaveAndroid))]
• UWP (SaveWindows.cs): [assembly: Dependency(typeof(SaveWindows))]

C#

//Loading an existing PowerPoint presentation.
Assembly assembly = typeof(App).GetTypeInfo().Assembly;
//Open the existing PowerPoint presentation with loaded stream.
using (IPresentation pptxDoc = Presentation.Open(assembly.GetManifestResourceStream("Convert-PowerPoint-Presentation-to-Image.Assets.Input.pptx")))
{
    //Initialize the PresentationRenderer.
    pptxDoc.PresentationRenderer = new PresentationRenderer();
    //Convert the first PowerPoint slide to a stream.
    using (Stream stream = pptxDoc.Slides[0].ConvertToImage(ExportImageFormat.Jpeg))
    {
        //Reset the stream position.
        stream.Position = 0;
        //Create the MemoryStream to save the converted image.
        using (MemoryStream imageStream = new MemoryStream())
        {
            stream.CopyTo(imageStream);
            //Save the stream as a file on the device and invoke it for viewing.
            Xamarin.Forms.DependencyService.Get<ISave>().SaveAndView("PPTXtoImage.Jpeg", "application/jpeg", imageStream);
        }
    }
}

Helper files for Xamarin

Refer the below helper files and add them into the mentioned project. These helper files allow you to save the stream as a physical file and open the file for viewing.

Project	File Name	Summary
Portable project	ISave.cs	Represents the base interface for the save operation.
iOS Project	SaveIOS.cs	Save implementation for iOS.
	PreviewControllerDS.cs	Helper class for viewing the PowerPoint Presentation on iOS.
Android project	SaveAndroid.cs	Save implementation for Android.
UWP project	SaveWindows.cs	Save implementation for UWP.

Compile and execute the application. Now this application convert a PowerPoint to image.

You can download a complete working sample from GitHub.

By executing the program, you will get the image as follows.

Click here to explore the rich set of Syncfusion PowerPoint Library (Presentation) features.

An online sample link to convert PowerPoint Presentation to image in ASP.NET Core.