CefConverter "Failed to convert webpage"
Hi again,
I have got this working locally again using - Syncfusion.HtmlToPdfConverter.QtWebKit.Net.Core --version 27.1.51
However, it still won't work in my Azure (Windows Basic B1) environment.
This is the method:
public async Task<GeneratedReport> GeneratePdfAsync(object data, string templateId, bool landscape = false)
{
var html = await GenerateHtml(templateId, data);
var htmlConverter = new HtmlToPdfConverter(HtmlRenderingEngine.WebKit);
var settings = new WebKitConverterSettings
{
Margin = new Syncfusion.Pdf.Graphics.PdfMargins
{
All = 20
},
Orientation = landscape ? Syncfusion.Pdf.PdfPageOrientation.Landscape : Syncfusion.Pdf.PdfPageOrientation.Portrait,
TempPath = TemporaryFilesPath,
DisableWebKitWarning = true
};
htmlConverter.ConverterSettings = settings;
try
{
var document = htmlConverter.Convert(html, "https://wrms.website.com/");
var stream = new MemoryStream();
document.Save(stream);
document.Close(true);
stream.Position = 0;
return new GeneratedReport
{
Content = stream,
ContentType = "application/pdf"
};
}
catch (Exception ex)
{
// Log or handle the exception
_logger.LogError(ex, $"Conversion failed: {ex.Message}");
throw;
}
}
This is the error caught in App Insights - apologies for the image quality, the limit is 100kb
Hi Owen,
Please find the details below
|
Do I need to use the CEF engine for Windows Azure App Service Plans? Or can I use Webkit? |
The WebKit rendering engine internally uses the QtWebKit browser to perform HTML to PDF conversion. It is a legacy rendering engine, that has some known rendering issues and limitations, some of the advanced Bootstrap CSS styles are not supported. So we strongly recommended to use our cef rendering engine to perform HTML to PDF conversion in Azure app service windows. You can find our UG documentation below to perform HTML to PDF conversion using CEF rendering engine in Azure app service windows
UG: Convert-html-to-pdf-in-azure-app-service-windows
However, we have
attached the sample using CEF rendering engine and published URL for your
reference |
|
I have got this working locally again using - Syncfusion.HtmlToPdfConverter.QtWebKit.Net.Core --version 27.1.51
However, it still won't work in my Azure (Windows Basic B1) environment. |
We have checked the provided issue screenshot on our end. We suspect that the exception may occur due to the missing of VC++ 2010 redistributable (MSVCP100.dll and MSVCR100.dll) in your Azure App service environment. WebKit rendering requires VC++ 2010 redistributable to perform the conversion. So, please include the below VC++ redistributable files in the QtBinaries folder and select copy if newer option in the properties then publish it in azure app service to resolve the issue.
We have attached screenshot and VC++ DLLs for your reference.
VC ++ DLLs: https://www.syncfusion.com/downloads/support/directtrac/general/ze/Redistributable147672089
Screenshot:  As we mentioned
earlier, Webkit rendering engine is a legacy rendering engine. If you still want to use webkit rendering
engine, please try the above solution and let us know the result. |
Regards,
Arumugam M
I'm still attempting to use the WebKit converter - it works locally, but not in Azure. I added the VC++ binaries to the project, but it is still failing with the same message:
The binaries are added like so:
And they are present, as you can see:
Am I missing something?
Hi - this is still a problem for me.
I just attempted to use the Cef library again, but it won't run locally, with this exception:
Its still a .NET 8.0 project referencing the latest published version:
<PackageReference Include="Syncfusion.HtmlToPdfConverter.Cef.Net.Windows" Version="27.1.52" />
This is the method that is failing - remember this works with WebKit, until I upload it to Azure:
public async Task<GeneratedReport> GeneratePdfAsync(object data, string templateId, bool landscape = false)
{
var html = await GenerateHtml(templateId, data);
var htmlConverter = new HtmlToPdfConverter(HtmlRenderingEngine.Cef);
var settings = new CefConverterSettings
{
Margin = new Syncfusion.Pdf.Graphics.PdfMargins
{
All = 20
},
Orientation = landscape ? Syncfusion.Pdf.PdfPageOrientation.Landscape : Syncfusion.Pdf.PdfPageOrientation.Portrait,
TempPath = TemporaryFilesPath,
MediaType = MediaType.Print,
HtmlEncoding = Encoding.UTF8
};
htmlConverter.ConverterSettings = settings;
try
{
var document = htmlConverter.Convert(html, "https://wrms.watco.com/");
var stream = new MemoryStream();
document.Save(stream);
document.Close(true);
stream.Position = 0;
return new GeneratedReport
{
Content = stream,
ContentType = "application/pdf"
};
}
catch (Exception ex)
{
// Log or handle the exception
_logger.LogError(ex, $"Conversion failed: {ex.Message}");
throw;
}
}
I've just tried dropping your code in:
var htmlConverter = new HtmlToPdfConverter(HtmlRenderingEngine.Cef);
var cefConverterSettings = new CefConverterSettings();
//Set Blink viewport size.
cefConverterSettings.ViewPortSize = new Syncfusion.Drawing.Size(1280, 0);
//Assign Blink converter settings to HTML converter.
htmlConverter.ConverterSettings = cefConverterSettings;
try
{
var document = htmlConverter.Convert("https://www.google.com");
var stream = new MemoryStream();
document.Save(stream);
document.Close(true);
stream.Position = 0;
return new GeneratedReport
{
Content = stream,
ContentType = "application/pdf"
};
}
catch (Exception ex)
{
// Log or handle the exception
_logger.LogError(ex, $"Conversion failed: {ex.Message}");
throw;
}
I can't convert google.com either:
I'm trying WebKit again... It still works locally and fails on Azure with the attached error captured in App Insights.
Attachment: query_data_aba4d9e0.zip
Hi Owen,
Thank you for the update regarding Webkit rendering engine.
We have checked your issue on our end regarding Cef rendering engine. Upon further analysis, we suspect that the reported issue may occur due to improper structure of runtime folders or runtime dlls are not copied properly in your project's location. We kindly request you to ensure your project structure should be similar to the below structure and the below specified dlls should be present in the specified structure.
1) bin->Debug->net8.0->runtimes->win-x64->lib->netcoreapp3.1
The below highlighted dlls should be present inside netcoreapp3.1 folder
2) bin->Debug->net8.0->runtimes->win-x64->native
Kindly make sure below highlighted 21 files should be present inside native folder.
3) Make sure CefSharp.BrowserSubprocess.runtimeconfig.JSON file in runtimes folder(bin\Debug\net8.0\runtimes\win-x64\native) is similar to the below JSON file. This JSON file are copied during runtime for .net 8.0 project, So, the runtimesOption should be net8.0 in JSON file. This ensures the runtimes JSON file are copied for .net8.0 project.
We kindly request you to check the runtime dlls are properly copied into your project's location as mentioned above. This ensures that the HTML to PDF conversion using CEF rendering engine is working properly.
Please ensure the above and let us know the result. Kindly get back to us if you need any further assistance in this.
Regards,
Arumugam M
My solution is structured such that i have a Reports project which is referenced by the main web application. The reports project has a direct reference to the SyncFusion library:
After Rebuilding the Reports project I see this:
Here the runtimeconfig.json has tfm set to "net8.0". The runtimes folder is otherwise empty.
In the referencing project I see the following:
I.e. there are quite a few libraries missing from the native folder. Also, the tfm setting in the runtimeconfig is "netcoreapp3.1"
How should I include the missing files?
Another thing, I just tried your sample from October 3, 2024 10:41 AM UTC
When I tried it, I got this exception:
PdfException: Failed to convert webpage
Syncfusion.HtmlConverter.CefConverter.Convert(string url)
Syncfusion.HtmlConverter.HtmlToPdfConverter.Convert(string url)
HTML_to_PDF_AzureAppServiceWindows_CEF.Controllers.HomeController.ConvertToPdf() in
HomeController.cs- PdfDocument document = htmlConverter.Convert("https://www.google.com");
lambda_method18(Closure , object , object[] )
Hi Owen,
We have checked the provided screenshot on our end. Upon further analysis, we found that the chromium dlls are not copied at runtimes folders during conversion process. The CEF HTML to PDF conversion fully depends on runtime assemblies to perform HTML to PDF conversion. In some projects NuGet packages might not directly copy their assemblies and runtime files to the output directory. We can overcome the reported issue by following the below steps
Add <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies> tag in the csproj file to copy the required runtime assemblies in the bin folder as highlighted in the below screenshot.
However, if you are still facing any issue we kindly request you to install the below package with version 119.4.3 through Manage NuGet packages along with our Syncfusion.HtmlToPdfConverter.Cef.Net.Windows package. This ensures the chromium runtime files are copied in the runtimes folder.
NuGet\Install-Package chromiumembeddedframework.runtime.win-x64 -Version 119.4.3 |
Please try the above solution and get back to us. We look forward to hear from you on whether this solution resolves the reported issue.
Regards,
Arumugam M
Adding CopyLocalLockFileAssembies did not work. This is the bin folder content in the parent project:
Once I add the explicit reference to chromiumembeddedframework.runtime.win-x64 my application has a fatal error:
[1017/094240.811:FATAL:gpu_data_manager_impl_private.cc(448)] GPU process isn't usable. Goodbye.
The native folder has many more files now, but the runtimeconfig.json still has tfm equal to netcoreapp3.1
Hi - I have this working locally now. I added a reference to the parent project:
<PackageReference Include="CefSharp.OffScreen.NETCore" Version="119.4.30" />
I removed the other suggestions you made and it still works.
However, it does not work in Azure.
