using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.IO;
using System.Net;

namespace ByteScoutWebApiExample
{
    class Program
    {
        // The authentication key (API Key).
        // Get your own by registering at https://app.pdf.co
        const String API_KEY = "***********************************";

        // Direct URL of source PDF file.
        // You can also upload your own file into PDF.co and use it as url. Check "Upload File" samples for code snippets: https://github.com/bytescout/pdf-co-api-samples/tree/master/File%20Upload/
        const string SourceFileUrl = "https://bytescout-com.s3.amazonaws.com/files/demo-files/cloud-api/pdf-make-searchable/sample.pdf";
        // Comma-separated list of page indices (or ranges) to process. Leave empty for all pages. Example: '0,2-5,7-'.
        const string Pages = "";
        // PDF document password. Leave empty for unprotected documents.
        const string Password = "";
        // Destination PDF file name
        const string DestinationFile = @".\result.pdf";

        // Sample profile that sets advanced conversion options
        // Advanced options are properties of SearchablePDFMaker class from ByteScout PDF Extractor SDK used in the back-end:
        // https://cdn.bytescout.com/help/BytescoutPDFExtractorSDK/html/5dee0c85-e13d-b93b-ab0f-d4b42ef60756.htm
        static string Profiles = File.ReadAllText("profile.json");


        static void Main(string[] args)
        {
            // Create standard .NET web client instance
            WebClient webClient = new WebClient();

            // Set API Key
            webClient.Headers.Add("x-api-key", API_KEY);

            // URL for `Make Searchable PDF` API call
            string url = Uri.EscapeUriString(string.Format(
                "https://api.pdf.co/v1/pdf/makesearchable?name={0}&password={1}&pages={2}&url={3}&profiles={4}",
                Path.GetFileName(DestinationFile),
                Password,
                Pages,
                SourceFileUrl,
                Profiles));

            // Prepare requests params as JSON
            Dictionary<string, object> parameters = new Dictionary<string, object>();
            parameters.Add("name", Path.GetFileName(DestinationFile));
            parameters.Add("password", Password);
            parameters.Add("pages", Pages);
            parameters.Add("url", SourceFileUrl);
            parameters.Add("profiles", Profiles);

            // Convert dictionary of params to JSON
            string jsonPayload = JsonConvert.SerializeObject(parameters);

            try
            {
                // Execute POST request with JSON payload
                string response = webClient.UploadString(url, jsonPayload);

                // Parse JSON response
                JObject json = JObject.Parse(response);

                if (json["error"].ToObject<bool>() == false)
                {
                    // Get URL of generated PDF file
                    string resultFileUrl = json["url"].ToString();

                    // Download PDF file
                    webClient.DownloadFile(resultFileUrl, DestinationFile);

                    Console.WriteLine("Generated PDF file saved as \"{0}\" file.", DestinationFile);
                }
                else
                {
                    Console.WriteLine(json["message"].ToString());
                }
            }
            catch (WebException e)
            {
                Console.WriteLine(e.ToString());
            }

            webClient.Dispose();

            Console.WriteLine();
            Console.WriteLine("Press any key...");
            Console.ReadKey();
        }
    }
}

{
  "profiles": [
    {
      "profile1": {
        "OCRLanguage": "eng",
        "OCRResolution":  300
      }
    }
  ]
}