Generate PDF From Large HTML File | C# | HTML To PDF APIByteScout PDF SDK

Generate PDF From Large HTML File | C# | HTML To PDF API

Program.cs:

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

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 = "*********************************";

        static void Main(string[] args)
        {
            // HTML input
            string inputSample = File.ReadAllText(@".\sample.html");

            // Destination PDF file name
            string destinationFile = @".\result.pdf";

            // Create standard .NET web client instance
            WebClient webClient = new WebClient();

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

            // Set JSON content type
            webClient.Headers.Add("Content-Type", "application/json");

            try
            {
                // Prepare requests params as JSON
                // See documentation: https://apidocs.pdf.co/?#1-json-pdfconvertfromhtml
                Dictionary<string, object> parameters = new Dictionary<string, object>();

                // Input HTML code to be converted. Required. 
                parameters.Add("html", inputSample);

                // Name of resulting file
                parameters.Add("name", Path.GetFileName(destinationFile));

                // Set to css style margins like 10 px or 5px 5px 5px 5px.
                parameters.Add("margins", "5px 5px 5px 5px");

                // Can be Letter, A4, A5, A6 or custom size like 200x200
                parameters.Add("paperSize", "Letter");

                // Set to Portrait or Landscape. Portrait by default.
                parameters.Add("orientation", "Portrait");

                // true by default. Set to false to disbale printing of background.
                parameters.Add("printBackground", true);

                // If large input document, process in async mode by passing true
                parameters.Add("async", true);

                // Set to HTML for header to be applied on every page at the header.
                parameters.Add("header", "");

                // Set to HTML for footer to be applied on every page at the bottom.
                parameters.Add("footer", "");


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


                // Prepare URL for `HTML to PDF` API call
                string url = "https://api.pdf.co/v1/pdf/convert/from/html";

                // 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 PDF 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(jobId); // Possible statuses: "working", "failed", "aborted", "success".

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

                        if (status == "success")
                        {
                            webClient.Headers.Remove("Content-Type"); // remove the header required for only the previous request

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

                            Console.WriteLine("Generated PDF 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 to exit...");
            Console.ReadKey();
        }

        /// <summary>
        /// Check Job Status
        /// </summary>
        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"]);
            }
        }
    }
}