OnDoc/API_NetFramework/Controllers/ImageController.cs

using System;
using System.Collections.Generic;
using System.Drawing.Drawing2D;
using System.Drawing;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using API_NetFramework.Models;
using System.Web.WebPages;
using System.IO;

namespace API_NetFramework.Controllers
{
    public class ImageController : ApiController
    {
        string tokenfunction = "Image";

        private System.Drawing.Image ResizeImage(System.Drawing.Image imgToResize, Size size)
        {
            // Get the image current width
            int sourceWidth = imgToResize.Width;
            // Get the image current height
            int sourceHeight = imgToResize.Height;
            float nPercent = 0;
            float nPercentW = 0;
            float nPercentH = 0;
            // Calculate width and height with new desired size
            nPercentW = ((float)size.Width / (float)sourceWidth);
            nPercentH = ((float)size.Height / (float)sourceHeight);
            nPercent = Math.Min(nPercentW, nPercentH);
            // New Width and Height
            int destWidth = (int)(sourceWidth * nPercent);
            int destHeight = (int)(sourceHeight * nPercent);
            Bitmap b = new Bitmap(destWidth, destHeight);
            Graphics g = Graphics.FromImage((System.Drawing.Image)b);
            g.InterpolationMode = InterpolationMode.HighQualityBicubic;
            // Draw image with new width and height
            g.DrawImage(imgToResize, 0, 0, destWidth, destHeight);
            g.Dispose();
            return (System.Drawing.Image)b;
        }

        private System.Drawing.Image resizeImage(System.Drawing.Image imgToResize, Size size)
        {
            return (System.Drawing.Image)(new Bitmap(imgToResize, size));
        }

        [HttpGet]
        [Route("API/GetImageAsBase64")]

        public IHttpActionResult GetImageAsBase64(int imageid, int ImageWidth = 0, int ImageHeight = 0)
        {
            string path = System.Configuration.ConfigurationManager.AppSettings["ImagePath"];
            string filename = "";
            int defaultheigt = 0;
            int defaultwidth = 0;
            APILogging.Log((HttpRequestMessage)Request, "Image-Bezug: " + imageid.ToString(), LogLevelType.Info);

            //if (SecuringWebApiUsingApiKey.Middleware.ApiKeyMiddleware.Authorized((HttpRequestMessage)Request, tokenfunction) == false)
            //{
            //    return Content(HttpStatusCode.Unauthorized, "Invalid Token or API-Key");
            //}
            System.Data.DataSet ds = new System.Data.DataSet();
            ds.ReadXml(path + "imageids.xml");
            filename = "";
            foreach (System.Data.DataRow row in ds.Tables[0].Rows)
            {
                if (Convert.ToInt32(row[0]) == imageid)
                {
                    defaultheigt = Convert.ToInt32(row[3]);
                    defaultwidth = Convert.ToInt32(row[2]);
                    filename = path + row[1].ToString();
                }
            }
            ds.Dispose();
            if (filename == "")
            {
                APILogging.Log((HttpRequestMessage)Request, "Image-Bezug - nicht vorhanden: " + imageid.ToString(), LogLevelType.Info);
                return Content(HttpStatusCode.NotFound, "Image ID: " + imageid.ToString()+"nicht gefunden");
            }

            System.Drawing.Image iimg = System.Drawing.Image.FromFile(filename);
            System.Drawing.Image imgnew = null;

            switch (ImageWidth)
            {
                case 0:
                    ImageWidth =defaultwidth;
                    ImageHeight = defaultheigt;
                    Bitmap b = new Bitmap(iimg);
                    imgnew = ResizeImage(b, new Size(ImageHeight, ImageWidth));
                    b = null;
                    break;
                case -1:
                    imgnew = iimg;
                    break;
                default:
                    Bitmap b1 = new Bitmap(iimg);
                    imgnew = ResizeImage(b1, new Size(ImageHeight, ImageWidth));
                    b1 = null;
                    break;

            }
            using (MemoryStream m = new MemoryStream())
            {
                string newfilename = path + Guid.NewGuid().ToString() + ".jpg";
                imgnew.Save(newfilename);
                imgnew = System.Drawing.Image.FromFile(newfilename);
                imgnew.Save(m, imgnew.RawFormat);
                byte[] imageBytes = m.ToArray();
                imgnew.Dispose();
                m.Dispose();
                System.IO.File.Delete(newfilename);
                iimg.Dispose();
                iimg = null;
                imgnew = null;
                return Ok(Convert.ToBase64String(imageBytes));
            }
        }
    }
}