How to convert TIFF to ASP.NET Core PDF in Azure Functions 3.0?

The Syncfusion Essential® PDF is a .NET Core PDF library used to create, read, and edit PDF documents. Using this library, you can convert TIFF to PDF in Azure Functions 3.0.

Steps to convert TIFF to PDF in Azure Functions 3.0

1. Create an Azure Functions projects.

2. Select the framework to Azure Functions V3 (.NET Core) and select HTTP triggers as follows.

3. Install the Syncfusion.Pdf.Imaging.Net.Core NuGet package as a reference to the project.

4. Set Copy to Output Directory property to Copy if newer to input the TIFF file.

5. Include the following namespace in Functions1.cs file to convert the TIFF to PDF using C#

C#

using Syncfusion.Pdf;
using Syncfusion.Pdf.Graphics;
using System.Net.Http;
using System.Net;
using System.Net.Http.Headers;

6. Add the following code sample in Function1 class to convert TIFF to PDF in Azure Functions V3.

   string name = req.Query["name"];
   //Create a new PDF document
   PdfDocument document = new PdfDocument();
    
   //Load the multi frame TIFF image from the disk
   string TiffPath = Path.Combine(executionContext.FunctionAppDirectory, "Data", "image.tiff");
   FileStream imageStream = new FileStream(TiffPath, FileMode.Open, FileAccess.Read);
   PdfTiffImage tiffImage = new PdfTiffImage(imageStream);
    
   //Get the frame count
   int frameCount = tiffImage.FrameCount;
    
   //Access each frame and draw into the page
   for (int i = 0; i < frameCount; i++)
   {
          //Add a section to the PDF document
          PdfSection section = document.Sections.Add();
    
          //Set page margins
          section.PageSettings.Margins.All = 0;
          tiffImage.ActiveFrame = i;
    
          //Create a PDF unit converter instance
          PdfUnitConvertor converter = new PdfUnitConvertor();
    
          //Convert to point
          Syncfusion.Drawing.SizeF size = converter.ConvertFromPixels(tiffImage.PhysicalDimension, PdfGraphicsUnit.Point);
    
          //Set page orientation
          section.PageSettings.Orientation = (size.Width > size.Height) ? PdfPageOrientation.Landscape : PdfPageOrientation.Portrait;
    
          //Set page size
          section.PageSettings.Size = size;
    
          //Add a page to the section
          PdfPage page = section.Pages.Add();
    
          //Draw TIFF image into the PDF page
          page.Graphics.DrawImage(tiffImage, Syncfusion.Drawing.PointF.Empty, size);
   }
    
   //Creating the stream object
   MemoryStream stream = new MemoryStream();
    
   //Save the document as stream
   document.Save(stream);
    
   //If the position is not set to '0' then the PDF will be empty
   stream.Position = 0;
    
   //Close the document
   document.Close(true);
    
   //Defining the ContentType for pdf file
   string contentType = "application/pdf";
    
   //Define the file name
   string fileName = "Output.pdf";
    
   HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
   response.Content = new ByteArrayContent(stream.ToArray());
   response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
   {
          FileName = filename
   };
   response.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/pdf");
    
   return response;
   

7. Now, you can check the conversion in the local machine.
8. Right-click the project and select publish.

9. Create a new function in the publishing window and create App service using the Azure subscription and select a hosting plan.

10. Configure the Hosting plan.

11. When creating a publish target, please unselect the Run from package file option. So, you can avoid the conversion failure due to permission restrictions.

12. Once the profile is created, click the publish button.

13. Now, go to the Azure portal and select the Functions Apps. After running the service, click the Get function URL -> Copy. Paste the same in the browser. In this example, you need to pass the webpage URL in the query string, which needs to convert TIFF to PDF.

(https://tifftopdfsample.azurewebsites.net/api/Function1?code=***********************)

A complete working sample can be downloaded from TIFFtoPDFSample.zip.

Take a moment to peruse the documentation. You will find other options like performing OCR on the image, region of the document, and large PDF documents with code examples.

Refer to here to explore a rich set of Syncfusion Essential® PDF features.