Help required on format conversion of labels

Question

We integrate with various shipping vendors like UPS, Citilogistics to name a few. Based on the routing of the parcels processed in the facility, we call the shipping vendor APIs & get the labels in response in different formats.
Example - UPS provides the labels in ZPL, whereas another provides the label as PDF ( base 64 format).
We are currently automating the parcel processing for which we need to convert various formats like - PDF, Image, html to a common format "ZPL" for printing. .

PDF, Image are available in the base 64 format.

Example for various label formats -

1. ZPL - Labelary Online ZPL Viewer
2. PDF (in base 64 format) - attached PDF
3. Html format.

We want to convert all the formats to common format - ZPL. Are there any libraries to convert pdf, image & html format to zpl.
Let me know if you have any ideas on the same, Thank you.

Answer 1

I wrote a piece of code to convert pdf to ZPL, which requires 4 nuget packages:

Code:

       static void Main(string[] args)  
        {  
            string filePath = @"";  
              
            byte[] bytes = File.ReadAllBytes(filePath);  
            String file = Convert.ToBase64String(bytes);  
  
            int pageNum =  PageCount(bytes);  
  
            List<string> strs = new List<string>();  
            for (int i = 0; i < pageNum; i++)  
            {  
                strs.Add(Conversion.ConvertPdfPage(file, dpi: 100, page: i));  
            }  
              
            Console.WriteLine("Press any key to continue...");  
            Console.ReadLine();  
        }  
        public static int PageCount(byte[] pdf)  
        {  
            using (var stream = new MemoryStream(pdf))  
            {  
                using (var reader = new PdfReader(stream))  
                {  
                    using (var document = new PdfDocument(reader))  
                    {  
                        return document.GetNumberOfPages();  
                    }  
                }  
            }  
        }  

The package also provides a method to convert Bitmap to ZPL:

Conversion.ConvertPdfPage(Bitmap bitmap)

I have not found a way to convert html to ZPL, but there should be many ways to convert it to PDF or images.

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