I am writing an AWS lambda function in C# .NET Core 3.1. I am reading a ppt file as stream and passing this stream to Aspose.Slides.Presentation to get the slides. I am using Aspose.Slides.NET (21.11.0) package.
The lambda function code is:
public async Task<bool> FunctionHandler(Params obj, ILambdaContext context)
{
var accessKey = System.Environment.GetEnvironmentVariable("AwsAccessKeyId");
var secretKey = System.Environment.GetEnvironmentVariable("AwsSecretAccessKey");
var region = System.Environment.GetEnvironmentVariable("Region");
_logger = context.Logger;
_logger.LogLine($"{LambdaName} process started");
try
{
using (var client = new AmazonS3Client(accessKey, secretKey, RegionEndpoint.GetBySystemName(region)))
{
var stream = await ReadFile(obj.bucketName, obj.keyName + @"/" + obj.uploadedPPTName, client);
_logger.LogLine($"File has been read as stream : Stream length : { stream.Length}");
Presentation presentation = new Presentation(stream);
var imagePrefix = obj.uploadedPPTName.Split('.')[0];
for (var index = 0; index < presentation.Slides.Count; index++)
{
ISlide slide = presentation.Slides[index];
Stream imageslideStream = new System.IO.MemoryStream();
var bitmap = slide.GetThumbnail(1f, 1f);
bitmap.Save(imageslideStream, ImageFormat.Png);
await WriteStreamFileToS3(obj.bucketName, obj.keyName, imageslideStream, $"{imagePrefix}-slide-{index + 1}", client);
}
}
}
catch(Exception ex)
{
_logger.LogLine($"An error occurred in FunctionHandler of {LambdaName} : {ex.ToString()}");
return false;
}
return true;
}
This lambda function is working fine on windows machine but when i publish this lambda function to AWS and run it, i get the following error:
START RequestId: 97efe54c-1f35-41c3-aee3-9811bca0c6ed Version: $LATEST
PowerPointProcessorLambda process started
File has been read as stream : Stream length : 2786125
Ann error occurred in FunctionHandler of PowerPointProcessorLambda : Aspose.Slides.PptxReadException: The type initializer for 'Gdip' threw an exception.
---> System.TypeInitializationException: The type initializer for 'Gdip' threw an exception.
---> System.DllNotFoundException: Unable to load shared library 'libgdiplus' or one of its dependencies. In order to help diagnose loading problems, consider setting the LD_DEBUG environment variable: liblibgdiplus: cannot open shared object file: No such file or directory
at System.Drawing.SafeNativeMethods.Gdip.GdiplusStartup(IntPtr& token, StartupInput& input, StartupOutput& output)
at System.Drawing.SafeNativeMethods.Gdip..cctor()
--- End of inner exception stack trace ---
at System.Drawing.SafeNativeMethods.Gdip.GdipLoadImageFromDelegate_linux(StreamGetHeaderDelegate getHeader, StreamGetBytesDelegate getBytes, StreamPutBytesDelegate putBytes, StreamSeekDelegate doSeek, StreamCloseDelegate close, StreamSizeDelegate size, IntPtr& image)
at System.Drawing.Image.InitializeFromStream(Stream stream)
at System.Drawing.Image.LoadFromStream(Stream stream, Boolean keepAlive)
at System.Drawing.Image.FromStream(Stream stream, Boolean useEmbeddedColorManagement, Boolean validateImageData)
at System.Drawing.Image.FromStream(Stream stream, Boolean useEmbeddedColorManagement)
at System.Drawing.Image.FromStream(Stream stream)
at Aspose.Slides.ImageCollection.( )
at .( )
at .( )
at .( , IPresentation )
at .(Presentation , Stream , InterruptionToken )
--- End of inner exception stack trace ---
at .(Presentation , Stream , InterruptionToken )
at Aspose.Slides.Presentation.(Stream , Boolean )
at Aspose.Slides.Presentation.(Stream , Boolean )
at Aspose.Slides.Presentation.(Stream )
at Aspose.Slides.Presentation..ctor(Stream stream)
at Opus.Lambda.PowerPointProcessor.Function.FunctionHandler(Params obj, ILambdaContext context) in D:\Projects\Code\Lambda.PowerPointProcessor\Function.cs:line 46
END RequestId: 97efe54c-1f35-41c3-aee3-9811bca0c6ed
REPORT RequestId: 97efe54c-1f35-41c3-aee3-9811bca0c6ed Duration: 8625.27 ms Billed Duration: 8626 ms Memory Size: 256 MB Max Memory Used: 148 MB Init Duration: 159.91 ms
This error is occurring at line Presentation presentation = new Presentation(stream); of lambda function.
I also tried using the CoreCompat.System.Drawing (1.0.0-beta006) package but still got the same error.
How can this error be resolved? Any help would be much appreciated.