using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using HiQPdfClient;

namespace HiQPdf_Demo
{
    public partial class RasterizePdfPagesToImages : System.Web.UI.Page
    {
        protected void buttonRasterizeToImages_Click(object sender, EventArgs e)
        {
            string serverIP = textBoxServerIP.Text;
            uint serverPort = uint.Parse(textBoxServerPort.Text);
            string serverPassword = textBoxServerPassword.Text;

            // get the PDF file
            string pdfFile = Server.MapPath("~") + @"\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(textBoxDPI.Text);

            int fromPdfPageNumber = int.Parse(textBoxFromPage.Text);
            int toPdfPageNumber = textBoxToPage.Text.Length > 0 ? int.Parse(textBoxToPage.Text) : 0;

            byte[] imageBuffer = null;

            if (checkBoxToTiff.Checked)
            {
                // 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;

                // get the first page image bytes in a buffer            
                try
                {
                    // get the .NET Image object
                    imageBuffer = pageImages[0].ImageData;
                }
                finally
                {
                    // dispose the page images
                    for (int i = 0; i < pageImages.Length; i++)
                        pageImages[i].Dispose();
                }
            }
            
            if (checkBoxToTiff.Checked)
            {
                // inform the browser about the binary data format
                HttpContext.Current.Response.AddHeader("Content-Type", "image/tiff");

                // let the browser know how to open the image and the image name
                HttpContext.Current.Response.AddHeader("Content-Disposition",
                            String.Format("attachment; filename={0}; size={1}", "PageImage.tiff", imageBuffer.Length.ToString()));
            }
            else
            {
                // inform the browser about the binary data format
                HttpContext.Current.Response.AddHeader("Content-Type", "image/png");

                // let the browser know how to open the image and the image name
                HttpContext.Current.Response.AddHeader("Content-Disposition",
                            String.Format("attachment; filename={0}; size={1}", "PageImage.png", imageBuffer.Length.ToString()));
            }

            // write the image buffer to HTTP response
            HttpContext.Current.Response.BinaryWrite(imageBuffer);

            // call End() method of HTTP response to stop ASP.NET page processing
            HttpContext.Current.Response.End();
        }

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

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                string pageUri = HttpContext.Current.Request.Url.AbsoluteUri;
                hyperLinkOpenPdf.NavigateUrl = pageUri.Substring(0, pageUri.LastIndexOf('/')) + @"/DemoFiles/Pdf/InputPdf.pdf";

                Master.SelectNode("rasterizePdf");

                Master.LoadCodeSample("RasterizePdfPagesToImages");
            }
        }
    }
}