How to convert TIFF to PDF on AWS Lambda with Foxit PDF SDK (.NET)

Foxit PDF SDK for Windows features three libraries: C++, C# (.NET) and Java, built to run in both desktop and server environments, both 32-bit and 64-bit.

Foxit PDF SDK (.NET) works with AWS Lambda for creating functions in C# such as rendering, viewing, annotating, signing, protecting and managing forms in PDFs. This article will provide specific instructions on converting converting TIFF to PDF.

First, you need to create a “AWS Lambda Project (.Net Core – C#) and add ‘fsdk_dotnet.dll’ as a reference to your project in Visual Studio. We describe the process of adding references to your projects in the ‘How to Create a Simple Project’ section of the Foxit PDF SDK Developer Guide (.NET).

The fsdk_dotnet.dll is located in the lib directory of the evaluation package. Once you do, you can add the following using statements.

using foxit;
using foxit.common;
using foxit.common.fxcrt;
using foxit.pdf;

Next, add the following code:

public string TiffToPDF(string input, string output)
{
 //the sn and key value are license/evaluation values. This is provided with the Foxit PDF SDK evaluation package in the lib directory.
 string sn = "SNValue"; //the SN value provided in the evaluation package at lib\gsdk_sn.txt
 string key = "SignKeyValue"; //the Sign value provided in evaluation package at lib\gsdk_key.txt
 ErrorCode error_code;
 try
 {
 error_code = Library.Initialize(sn, key); //Unlocks the library to be used. Make sure you update the sn and key file accordingly.
 if (error_code != ErrorCode.e_ErrSuccess)
 {
 return error_code.ToString();
 }
 PDFDoc doc = new PDFDoc(); //Creates a PDF document object
 foxit.common.Image image = new foxit.common.Image(input); //Create a image object from the text file
 int pageIndex = doc.GetPageCount(); //Get the page count
 PDFPage page = doc.InsertPage(pageIndex, image.GetWidth(), image.GetHeight()); //Adds a blank PDF page that matches the images height and width to the PDF document object
 page.StartParse((int)PDFPage.ParseFlags.e_ParsePageNormal, null, false); //Parsing is required here. Just do it.
 page.AddImage(image, 0, new PointF(0, 0), page.GetWidth(), page.GetHeight(), true); //Adds a image to the PDF page
 doc.SaveAs(output, (int)PDFDoc.SaveFlags.e_SaveFlagIncremental); //Save the new PDF to the output path
 image.Dispose(); //clean up the cache data used to create the image object
 page.Dispose(); //clean up the cache data used to create the PDF page
 doc.Dispose(); //clean up the cache data used to create the PDF Document object
 Library.Release(); //clean up the cache data used by the Foxit PDF SDK library
 }
 catch (foxit.PDFException e)
 {
 return e.Message; //If successful this will return the "E_ERRSUCCESS." Please check out the headers for other error codes.
 }
 catch (Exception e)
 {
 return e.Message;
 }
 return error_code.ToString().ToUpper();
}

The fsdk_dotnet.dll reference the fsdk.dll file located in the lib directory. Please ensure that the fsdk.dll is correctly outputted to the output directory for the reference to be correct.

Note: Further image types supported are:

• BMP
• JPG (or JPEG)
• PNG
• GIF
• TIF
• JPX or JPEG2000
• JBIG2