Split PDF From URL Asynchronously | C# | PDF Splitting APIByteScout PDF Extractor SDK

Split PDF From URL Asynchronously | C# | PDF Splitting API

Program.cs:

C#
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.Net;
using System.Threading;


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

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

        // Source PDF file to split
        const string SourceFileUrl = @"https://bytescout-com.s3.amazonaws.com/files/demo-files/cloud-api/pdf-split/sample.pdf";
        // Comma-separated list of page numbers (or ranges) to process. Example: '1,3-5,7-'.
        const string Pages = "1-2,3-";
        // (!) Make asynchronous job
        const bool Async = true;


        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);

            try
            {
                // URL for `Split PDF` API call
                string url = Uri.EscapeUriString(string.Format(
                    "https://api.pdf.co/v1/pdf/split?pages={0}&url={1}&async={2}",
                    Pages,
                    SourceFileUrl,
                    Async));

                // Prepare requests params as JSON
                Dictionary<string, object> parameters = new Dictionary<string, object>();
                parameters.Add("pages", Pages);
                parameters.Add("url", SourceFileUrl);
                parameters.Add("async", Async);

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

                // 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)
                {
                    // Asynchronous job ID
                    string jobId = json["jobId"].ToString();
                    // URL of generated JSON file available after the job completion; it will contain URLs of result PDF files.
                    string resultJsonFileUrl = 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(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 as string
                            string jsonFileString = webClient.DownloadString(resultJsonFileUrl);

                            JArray resultFilesUrls = JArray.Parse(jsonFileString);

                            // Download generated PDF files
                            int part = 1;
                            foreach (JToken token in resultFilesUrls)
                            {
                                string resultFileUrl = token.ToString();
                                string localFileName = String.Format(@".\part{0}.pdf", part);

                                webClient.DownloadFile(resultFileUrl, localFileName);

                                Console.WriteLine("Downloaded \"{0}\".", localFileName);
                                part++;
                            }
                            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 CheckJobStatus(string jobId)
        {
            using (WebClient webClient = new WebClient())
            {
                // Set API Key
                webClient.Headers.Add("x-api-key", API_KEY);

                string url = "https://api.pdf.co/v1/job/check?jobid=" + jobId;

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

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