AIParkingApplication/AIParkingApplication/EngineApiController.cs

using System;
using System.Net.Http;
using System.Threading.Tasks;
using OpenCvSharp;

namespace AIParkingApplication
{
    public class EngineApiController
    {
        private HttpClient httpClientEngine;

        public EngineApiController(string engineBaseAddress)
        {
            httpClientEngine = new HttpClient { BaseAddress = new Uri(engineBaseAddress), Timeout = TimeSpan.FromMilliseconds(5000) };
        }

        public async Task<OcrResult> SendEngineRequestAsync(Mat plateImage, PlateType plateType)
        {
            string plateImageBase64 = Convert.ToBase64String(plateImage.ToBytes());
            try
            {
                var request = new PlateRequestEngineModel
                {
                    Img64 = plateImageBase64,
                    Mode = plateType == PlateType.Square ? "square" : "long",
                    Display = "full"
                };
                HttpResponseMessage response = await httpClientEngine.PostAsJsonAsync("/get-from-frame", request);
                response.EnsureSuccessStatusCode();
                var ocrResult = await response.Content.ReadAsAsync<OcrResult>();
                return ocrResult;
            }
            catch (Exception ex)
            {
                Console.WriteLine($"SendEngineRequest : {ex.Message}");
                return new OcrResult();
            }
        }
    }
}