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Text from PPTX is stripped

We are actively evaluating the ASPOSE.TOTAL and interested in purchasing OEM version of it. We have built our PoC solution using the component, but we are facing an issue in converting some PPTX. Can someone help us or direct us to someone who can analyze the issue?

Attached is the PPTX in question. First 2 pages in PNG contains no text. We tried with system default font as well as custom (gulim) one, but result is the same.

Please help. We have a tight timeline to make go, no-go decision with ASPOSE.


using Aspose.Slides;
using Meerue.Converter;
using Meerue.Converter.Message;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Text;
using System.IO;

namespace Meerue.OfficeConverter.Slide


public class SlideConverter : BaseConverter, IConverter


private const string DEFAUlT_FONT = "gulim";

private static SlideConverter instance;

private SlideConverter()




public static SlideConverter Instance




if (instance == null)

instance = new SlideConverter();

return instance;



public void Initialize()


License lic = new License();


// Load private font.

PrivateFontCollection fontCollection = new PrivateFontCollection();

fontCollection.AddFontFile(Path.Combine(System.Environment.GetFolderPath(Environment.SpecialFolder.Fonts), "gulim.ttc"));


public IEnumerable Convert(Stream source, ConvertOption option)


source.Position = 0;

var loadOpt = new LoadOptions(LoadFormat.Auto)


DefaultAsianFont = DEFAUlT_FONT,

DefaultRegularFont = DEFAUlT_FONT,

DefaultSymbolFont = DEFAUlT_FONT,

OnlyLoadDocumentProperties = true,


using (Presentation pres = new Presentation(source, loadOpt))


var orderedRange = GetPageRanges(pres.Slides.Count, option);

// Save each page of the document as Png.

foreach (var seq in orderedRange)


// can not convert to png directly.

ISlide slide = pres.Slides[seq];

//// check textFrame.

//foreach (IShape shp in slide.Shapes)


// if (shp.Placeholder != null)

// Console.WriteLine(((IAutoShape)shp).TextFrame.Text);


var sizeF = GetSizeF(option.ConvertQuality, pres.SlideSize.Size);

Bitmap bmp = slide.GetThumbnail(sizeF.Width, sizeF.Height);

Stream stream = new MemoryStream();

bmp.Save(stream, System.Drawing.Imaging.ImageFormat.Png);

yield return new ConvertResult(seq, stream);





public void HandleConvertFail(System.Exception ex, ConvertOption option)


throw new System.NotImplementedException();


private SizeF GetSizeF(Quality quality, SizeF slideSize)


//Getting scaled value of X and Y

float ScaleX = (float)(1.0 / slideSize.Width) * (5 / (int)quality);

float ScaleY = (float)(1.0 / slideSize.Height) * (5 / (int)quality);

ScaleX = (float)(int)quality / 5;

ScaleY = (float)(int)quality / 5;

Console.WriteLine(ScaleX.ToString() + ":" + ScaleY.ToString());

return new SizeF(ScaleX, ScaleY);





Thank you for considering Aspose and sharing the details.

I checked your issue with the latest version of Aspose.Slides for .NET v14.10.0 and I am unable to notice any issue. The thumbnails are generated fine with text. Please see the attached reference images. If you are using an older version of the API, I would suggest you to download the latest version and give it a try. If you still face the issue, please share your system environment details with us i.e. OS, .NET Framework etc. with us and we will further test the issue based on the information shared by you.

Thanks & Regards,