AddFromHtml image support?

Tue Mar 06, 2018 3:14 pm

I need to insert formatted HTML from a rich text editor into a PPT text area. This code may have images embedded using the form <img src="data:image/png;base64,...(base64 encoded image)..."> - which I assume is not supported in Spire, because the results come up as little black boxes in the resulting output.

If I can find a way to extract the images, save them to a temp location, and convert the HTML to <img src="path"> format, will this work to get them to show up? If so, will the resulting PPTX have the images embedded in the file so the referenced files don't need to be maintained?

Wed Mar 07, 2018 3:02 am

Hello,

Thanks for your inquiry. I am sorry Spire.Presentation doesn't support the img tag at present and the image can't be embed to the PPT. However, I have posted your requirement to our DEV team to see if it's reachable. If any update, we will let you know.

Best regards,
Simon
E-icelbue

Thu Mar 08, 2018 8:25 pm

For future reference would it be possible for you to publish a list of what tags are currently supported? Might save a lot of trial and error for some of your customers.

Simon.yang wrote:Hello,

Thanks for your inquiry. I am sorry Spire.Presentation doesn't support the img tag at present and the image can't be embed to the PPT. However, I have posted your requirement to our DEV team to see if it's reachable. If any update, we will let you know.

Best regards,
Simon
E-icelbue

Fri Mar 09, 2018 2:56 am

Hello,

Thanks for your kind suggestion.
Actually, html tags are not very well supported in our Spire.Presentation currently and we always do improvements to better support them. For your need, we will do some investigations and give you a list of currently supported html tags. Once any update,we will let you know.

Sincerely,
Nina
E-iceblue support team

Tue Aug 11, 2020 10:40 am

Hi,

Sorry for the long silence.
Our Dev team did some optimizations for adding HTML in PowerPoint file and the img tag is supported well now, please download the latest Spire.Presentation (Spire.Presentation Pack Hotfix Version:5.8.1) and use the following code to have a try. In addition, we made a list of currently supported html tags for your kind reference.

Code: Select all: //Create an instance of presentation document Presentation ppt = new Presentation(); ShapeList shapes = ppt.Slides[0].Shapes; //Insert html with img shapes.AddFromHtml("<html><div>First paragraph<img src='..\\..\\..\\..\\..\\..\\Data\\Logo.png'/>Second paragraph </html>"); //Save the document string result = "InsertHtmlWithImage.pptx"; ppt.SaveToFile(result, FileFormat.Pptx2013);

Sinecerly,
Nina
E-iceblue support team