ByteScout Cloud API Server – PDF To JSON API – C# – Convert PDF To JSON From Uploaded File Asynchronously

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Program.cs

      
using System;
using System.IO;
using System.Net;
using Newtonsoft.Json.Linq;
using System.Threading;

// Please NOTE: In this sample we're assuming Cloud Api Server is hosted at "https://localhost". 
// If it's not then please replace this with with your hosting url.

// Cloud API asynchronous "PDF To JSON" job example.
// Allows to avoid timeout errors when processing huge or scanned PDF documents.

namespace ByteScoutWebApiExample
{
	class Program
	{
        // Source PDF file
        const string SourceFile = @".\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 JSON file name
		const string DestinationFile = @".\result.json";
		// (!) Make asynchronous job
		const bool Async = true;

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

            // Upload file
            string uploadedFileUrl = UploadFile(webClient, SourceFile);

            // Prepare URL for `PDF To JSON` API call
            string query = Uri.EscapeUriString(string.Format(
				"https://localhost/pdf/convert/to/json?name={0}&password={1}&pages={2}&url={3}&async={4}", 
				Path.GetFileName(DestinationFile),
				Password,
				Pages,
                uploadedFileUrl,
				Async));

			try
			{
				// Execute request
				string response = webClient.DownloadString(query);

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

				if (json["error"].ToObject<bool>() == false)
				{
					// Asynchronous job ID
					string jobId = json["jobId"].ToString();
					// URL of generated JSON file that will available after the job completion
					string resultFileUrl = json["url"].ToString();

					// Check the job status in a loop. 
					// If you don't want to pause the main thread you can rework the code 
					// to use a separate thread for the status checking and completion.
					do
					{
						string status = CheckJobStatus(webClient, jobId); // Possible statuses: "working", "failed", "aborted", "success".

						// Display timestamp and status (for demo purposes)
						Console.WriteLine(DateTime.Now.ToLongTimeString() + ": " + status);

						if (status == "success")
						{
							// Download JSON file
							webClient.DownloadFile(resultFileUrl, DestinationFile);

							Console.WriteLine("Generated JSON file saved as \"{0}\" file.", DestinationFile);
							break;
						}
						else if (status == "working")
						{
							// Pause for a few seconds
							Thread.Sleep(3000);
						}
						else
						{
							Console.WriteLine(status);
							break;
						}
					}
					while (true);
				}
				else
				{
					Console.WriteLine(json["message"].ToString());
				}
			}
			catch (WebException e)
			{
				Console.WriteLine(e.ToString());
			}

			webClient.Dispose();

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

        static string UploadFile(WebClient webClient, string file)
        {
            // RETRIEVE THE PRESIGNED URL TO UPLOAD THE FILE:

            // Prepare URL for `Get Presigned URL` API call
            string query = Uri.EscapeUriString(string.Format(
                "https://localhost/file/upload/get-presigned-url?contenttype=application/octet-stream&name={0}",
                Path.GetFileName(SourceFile)));

            // Execute request
            string response = webClient.DownloadString(query);

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

            string uploadUrl = json["presignedUrl"].ToString();
            string uploadedFileUrl = json["url"].ToString();

            // UPLOAD FILE:

            webClient.Headers.Add("content-type", "application/octet-stream");
            webClient.UploadFile(uploadUrl, "PUT", SourceFile); // You can use UploadData() instead if your file is byte[] or Stream
            webClient.Headers.Remove("content-type");

            return uploadedFileUrl;
        }

        static string CheckJobStatus(WebClient webClient, string jobId)
		{
			string url = "https://localhost/job/check?jobid=" + jobId;

			string response = webClient.DownloadString(url);
			JObject json = JObject.Parse(response);

		    return Convert.ToString(json["status"]);
		}
	}
}

    

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packages.config

      
<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="Newtonsoft.Json" version="12.0.1" targetFramework="net40" />
</packages>
    

ON-PREMISE OFFLINE SDK

60 Day Free Trial or Visit ByteScout Cloud API Server Home Page

Explore ByteScout Cloud API Server Documentation

Explore Samples

Sign Up for ByteScout Cloud API Server Online Training

ON-DEMAND REST WEB API

Get Your API Key

Explore Web API Docs

Explore Web API Samples

ON-PREMISE OFFLINE SDK

60 Day Free Trial or Visit ByteScout Cloud API Server Home Page

Explore ByteScout Cloud API Server Documentation

Explore Samples

Sign Up for ByteScout Cloud API Server Online Training

ON-DEMAND REST WEB API

Get Your API Key

Explore Web API Docs

Explore Web API Samples