Rasterize PDF Pages to Images

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Hosting;

using HiQPdfClient;

namespace HiQPdf_Demo.Controllers
{
    public class RasterizePdfPagesToImagesController : Controller
    {
        IFormCollection m_formCollection;
        IWebHostEnvironment m_hostingEnvironment;
        public RasterizePdfPagesToImagesController(IWebHostEnvironment hostingEnvironment)
        {
            m_hostingEnvironment = hostingEnvironment;
        }

        // GET: RasterizePdfPagesToImages
        public ActionResult Index()
        {
            SetCrtPageUri();

            return View();
        }

        [HttpPost]
        public ActionResult RasterizeToImages(IFormCollection collection)
        {
            m_formCollection = collection;

            string serverIP = collection["textBoxServerIP"];
            uint serverPort = uint.Parse(collection["textBoxServerPort"]);
            string serverPassword = collection["textBoxServerPassword"];

            // get the PDF file
            string pdfFile = m_hostingEnvironment.WebRootPath + "/DemoFiles/Pdf/InputPdf.pdf";

            // create the PDF rasterizer
            PdfRasterizer pdfRasterizer = new PdfRasterizer(serverIP, serverPort);

            // use server password if necessary
            if (serverPassword.Length > 0)
                pdfRasterizer.ServerPassword = serverPassword;

            // set a demo serial number
            pdfRasterizer.SerialNumber = "YCgJMTAE-BiwJAhIB-EhlWTlBA-UEBRQFBA-U1FOUVJO-WVlZWQ==";

            // set the output images color space
            pdfRasterizer.ColorSpace = GetColorSpace();

            // set the rasterization resolution in DPI
            pdfRasterizer.DPI = int.Parse(collection["textBoxDPI"]);

            int fromPdfPageNumber = int.Parse(collection["textBoxFromPage"]);
            int toPdfPageNumber = collection["textBoxToPage"][0].Length > 0 ? int.Parse(collection["textBoxToPage"]) : 0;

            byte[] imageBuffer = null;

            if (collection["checkBoxToTiff"].Count > 0)
            {
                // convert the PDF document to a multipage TIFF image in a memory buffer
                // the TIFF images can also be produced in a file using the RasterizeToTiffFile method
                imageBuffer = pdfRasterizer.RasterizeToTiff(pdfFile, fromPdfPageNumber, toPdfPageNumber);
            }
            else
            {
                // rasterize a range of pages of the PDF document to memory in .NET Image objects
                // the images can also be produced to a folder using the RasterizeToImageFiles method
                // or they can be produced one by one using the RaisePageRasterizedEvent method
                PdfPageRasterImage[] pageImages = pdfRasterizer.RasterizeToImageObjects(pdfFile, fromPdfPageNumber, toPdfPageNumber);

                // return if no page was rasterized
                if (pageImages.Length == 0)
                    return Redirect("/RasterizePdfPagesToImages");

                // get the first page image bytes in a buffer            
                try
                {
                    // get the image data in a buffer
                    imageBuffer = pageImages[0].ImageData;
                }
                finally
                {
                    // dispose the page images
                    for (int i = 0; i < pageImages.Length; i++)
                        pageImages[i].Dispose();
                }
            }

            if (collection["checkBoxToTiff"].Count > 0)
            {
                FileResult fileResult = new FileContentResult(imageBuffer, "image/tiff");
                fileResult.FileDownloadName = "PageImage.tiff";

                return fileResult;
            }
            else
            {
                FileResult fileResult = new FileContentResult(imageBuffer, "image/png");
                fileResult.FileDownloadName = "PageImage.png";

                return fileResult;
            }
        }

        private RasterImageColorSpace GetColorSpace()
        {
            switch (m_formCollection["dropDownListColorSpace"])
            {
                case "RGB":
                    return RasterImageColorSpace.Rgb;
                case "Gray Scale":
                    return RasterImageColorSpace.GrayScale;
                case "Black and White":
                    return RasterImageColorSpace.BlackWhite;
                default:
                    return RasterImageColorSpace.Rgb;
            }
        }

        private void SetCrtPageUri()
        {
            HttpRequest httpRequest = this.ControllerContext.HttpContext.Request;
            UriBuilder uriBuilder = new UriBuilder();
            uriBuilder.Scheme = httpRequest.Scheme;
            uriBuilder.Host = httpRequest.Host.Host;
            if (httpRequest.Host.Port != null)
                uriBuilder.Port = (int)httpRequest.Host.Port;
            uriBuilder.Path = httpRequest.PathBase.ToString() + httpRequest.Path.ToString();
            uriBuilder.Query = httpRequest.QueryString.ToString();

            ViewData["CrtPageUri"] = uriBuilder.Uri.AbsoluteUri;
        }
    }
}