Convert PowerPoint Presentation to Image in AWS Lambda

8 Nov 20245 minutes to read

Syncfusion PowerPoint is a .NET Core PowerPoint library used to create, read, edit and convert PowerPoint documents programmatically without Microsoft PowerPoint or interop dependencies. Using this library, you can convert a PowerPoint Presentation to image in AWS Lambda.

Steps to convert PowerPoint Presentation to Image in AWS Lambda

Step 1: Create a new AWS Lambda project as follows.

Step 2: Select Blueprint as Empty Function and click Finish.

Step 3: Install the following Nuget packages in your application from Nuget.org.

• Syncfusion.PresentationRenderer.Net.Core
• SkiaSharp.NativeAssets.Linux v2.88.8
• HarfBuzzSharp.NativeAssets.Linux v7.3.0.2

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: Create a folder and copy the required data files and include the files to the project.

Step 5: Set the copy to output directory to Copy if newer to all the data files.

Step 6: Include the following namespaces in Function.cs file.

C#

using Syncfusion.Presentation;
using Syncfusion.PresentationRenderer;

step 7: Add the following code snippet in Function.cs to convert a PowerPoint Presentation to image.

C#

/// <summary>
/// A simple function that takes a string and does a ToUpper
/// </summary>
/// <param name="input"></param>
/// <param name="context"></param>
/// <returns></returns>
public string FunctionHandler(string input, ILambdaContext context)
{
    string filePath = Path.GetFullPath(@"Data/Input.pptx");
    //Open the existing PowerPoint presentation with loaded stream.
    using (IPresentation pptxDoc = Presentation.Open(filePath))
    {
        //Initialize the PresentationRenderer to perform image conversion.
        pptxDoc.PresentationRenderer = new PresentationRenderer();
        //Convert PowerPoint slide to image as stream.
        Stream stream = pptxDoc.Slides[0].ConvertToImage(ExportImageFormat.Jpeg);
        //Reset the stream position.
        stream.Position = 0;
        // Create a memory stream to save the image.
        MemoryStream memoryStream = new MemoryStream();
        stream.CopyTo(memoryStream);
        return Convert.ToBase64String(memoryStream.ToArray());
    }
}

Step 8: Right-click the project and select Publish to AWS Lambda.

Step 9: Create a new AWS profile in the Upload Lambda Function Window. After creating the profile, add a name for the Lambda function to publish. Then, click Next.

Step 10: In the Advanced Function Details window, specify the Role Name as based on AWS Managed policy. After selecting the role, click the Upload button to deploy your application.

Step 11: After deploying the application, you can see the published Lambda function in AWS console.

Step 12: Edit Memory size and Timeout as maximum in General configuration of the AWS Lambda function.

Steps to post the request to AWS Lambda

Step 1: Create a new console project.

step 2: Install the following Nuget packages in your application from Nuget.org.

• AWSSDK.Core
• AWSSDK.Lambda
• Newtonsoft.Json
  
  
  

Step 3: Include the following namespaces in Program.cs file.

C#

using Amazon;
using Amazon.Lambda;
using Amazon.Lambda.Model;
using Newtonsoft.Json;

Step 4: Add the following code snippet in Program.cs to invoke the published AWS Lambda function using the function name and access keys.

C#

//Create a new AmazonLambdaClient
AmazonLambdaClient client = new AmazonLambdaClient("awsaccessKeyID", "awsSecreteAccessKey", RegionEndpoint.USEast2);
//Create new InvokeRequest with published function name.
InvokeRequest invoke = new InvokeRequest
{
    FunctionName = "MyNewFunction",
    InvocationType = InvocationType.RequestResponse,
    Payload = "\"Test\""
};
//Get the InvokeResponse from client InvokeRequest.
InvokeResponse response = client.Invoke(invoke);
//Read the response stream
var stream = new StreamReader(response.Payload);
JsonReader reader = new JsonTextReader(stream);
var serilizer = new JsonSerializer();
var responseText = serilizer.Deserialize(reader);
//Convert Base64String into image file.
byte[] bytes = Convert.FromBase64String(responseText.ToString());
FileStream fileStream = new FileStream("PPTXtoImage.Jpeg", FileMode.Create);
BinaryWriter writer = new BinaryWriter(fileStream);
writer.Write(bytes, 0, bytes.Length);
writer.Close();
System.Diagnostics.Process.Start("PPTXtoImage.Jpeg");

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

From GitHub, you can download the console application and AWS Lambda project.

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.