Hi - I am using the HTML to PDF conversion in an ASP.NET Core 3.1 application - it works perfectly in both the local development environment and when hosted on a standard Windows IIS server - however when I deploy to an Azure App Service I get the following exception at the point of conversion:
Syncfusion.Pdf.PdfException: Failed to convert webpage
---> Syncfusion.Pdf.PdfException: Failed to convert webpage
at Syncfusion.HtmlConverter.BlinkConverter.BlinkResult(Stream outputStream)
at Syncfusion.HtmlConverter.BlinkConverter.ConvertToPdf(String url, PdfDocument& document)
--- End of inner exception stack trace ---
at Syncfusion.HtmlConverter.BlinkConverter.Convert(String url)
at Syncfusion.HtmlConverter.BlinkConverter.Convert(String htmlString, String baseurl)
at Syncfusion.HtmlConverter.HtmlToPdfConverter.Convert(String html, String baseurl)
...
I have verified that the path is correct and all binaries are copied correctly (using the app service editor). I know it is locating the BlinkBinaries folder correctly because the error message is different if they are missing. I have also added the OpenSSL libraries just in case that was the problem - but it makes no difference.
I have worked through all the similar issues raised and their responses on this website, and the published tutorials on it - but none of it is getting me anywhere. Is there any way to - for example - get more detailed error information to tell us why it failed to convert the page?
The relevant lines of code are...
using Syncfusion.Drawing;
using Syncfusion.HtmlConverter;
using Syncfusion.Pdf;
using Syncfusion.Pdf.Graphics;
using Syncfusion.Pdf.Parsing;
private readonly string _root;
public TestService(IHostEnvironment env)
{
_root = env.ContentRootPath;
}
...
protected override async Task DoWork()
{
...
//Initialize the HTML to PDF converter
var settings = new BlinkConverterSettings { BlinkPath = $"{_root}\\BlinkBinaries", PdfPageSize = PdfPageSize.A4, MediaType = MediaType.Print };
var htmlConverter = new HtmlToPdfConverter(HtmlRenderingEngine.Blink) {ConverterSettings = settings };
...
//Code to generate the HTML as a string (verified working)
...
//Try the conversion. The wwwroot folder contains fonts and images that are referenced in the html
using var pdfDoc = htmlConverter.Convert(reportPage.Html, $"{_root}\\wwwroot");
...
}
Any help you can give would be appreciated.
