I have a .NET 6 Web API project with DinkToPdf which I use on macOS on my dev machine, and two servers on Linux Ubuntu 20.4 and Windows Server 2012. My API detects OS on which it runs and uses the corresponding library to convert HTML to PDF file on output.
My controller:
public class ClientDocController : BaseController
{
private readonly IClientAppointmentDocumentService _clientAppointmentDocumentService;
private readonly IConverter _htmlToPdfConverter;
public ClientDocController(IClientAppointmentDocumentService clientAppointmentDocumentService, IConverter htmlToPdfConverter)
{
_clientAppointmentDocumentService = clientAppointmentDocumentService;
_htmlToPdfConverter = htmlToPdfConverter;
}
[HttpGet("{documentId}/pdf/")]
[RestApiAuthorize(AccountRolePermissions.VIEW_CLIENT_DOCUMENTS)]
public async Task<IActionResult> GetPdfAsync([FromRoute] int documentId, bool uploadToClientPortal, int? templateId = null,
bool clientPrint = false, bool sendToClientEmail = false, CancellationToken cancellationToken = default)
{
try
{
var htmlDocument = templateId == null
? await _clientAppointmentDocumentService.GetDefaultHtmlDocumentAsync(documentId, clientPrint, cancellationToken)
: await _clientAppointmentDocumentService.GetHtmlDocumentAsync(documentId, templateId, clientPrint, cancellationToken);
var fileName = $"Document_{documentId}_{DateTime.Now:s}.pdf";
var conversionSettings = PdfConfigurationDefaults.GetDefaultSettings(htmlDocument); //this get individual settings for each platform
var pdf = _htmlToPdfConverter.Convert(conversionSettings);
var result = File(pdf, MediaTypeNames.Application.Pdf, fileName);
if (sendToClientEmail) await _clientAppointmentDocumentService.SendToClientByEmailAsync(new[] {result});
if (!uploadToClientPortal) return result;
var accessToken = Request.Headers["Authorization"].ToString();
var response = await _clientAppointmentDocumentService.UploadToClientPortalAsync(documentId, result, accessToken);
return Ok(response);
}
catch (Exception e)
{
return BadRequest(e.Message);
}
}
}
This works well on all machines, although on Linux server there are images not included in resulting PDF under tag <img src="https://..." />
.
What I have checked:
conversionSettings
without any successAnybody have any ideas, what can I check further?
Had a similar issue on an application hosted on a Linux Ubuntu server and converting image to base 64 worked for me. Put the image in a folder called Resources and used the code below:
byte[] imageArray = File.ReadAllBytes(Path.Combine(Directory.GetCurrentDirectory(), "Resources", "logo.png"));
string base64ImageRepresentation = Convert.ToBase64String(imageArray);
Then the image in the html string:
string.Format("<img src=""data:image/png;base64,{0}"" width=""300"" height=""40"" />", base64ImageRepresentation);
Also had LoadImages set to true on the ObjectSettings:
var objectSettings = new ObjectSettings
{
WebSettings = { DefaultEncoding = "utf-8", LoadImages = true },
};
var pdf = new HtmlToPdfDocument()
{
Objects = { objectSettings }
};
Hope this helps!
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.