Cloud API – PDF To Image – C# – Convert PDF To PNG From URL Asynchronously

Cloud API – PDF To Image – C# – Convert PDF To PNG From URL Asynchronously

Program.cs

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


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

namespace ByteScoutWebApiExample
{
	class Program
	{
		// (!) If you are getting '(403) Forbidden' error please ensure you have set the correct API_KEY
		
		// The authentication key (API Key).
		// Get your own by registering at https://secure.bytescout.com/users/sign_up
		const String API_KEY = "***********************************";
		
		// Source PDF file
		const string SourceFileUrl = @"https://s3-us-west-2.amazonaws.com/bytescout-com/files/demo-files/cloud-api/pdf-to-image/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 = "";
		// (!) 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
			{
				// Prepare URL for `PDF To PNG` API call
				string query = Uri.EscapeUriString(string.Format(
					"https://api.pdf.co/v1/pdf/convert/to/png?password={0}&pages={1}&url={2}&async={3}",
					Password,
					Pages,
					SourceFileUrl,
					Async));

				// 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 available after the job completion; it will contain URLs of result PNG 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: "InProgress", "Failed", "Aborted", "Finished".

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

						if (status == "Finished")
						{
							// Download JSON file as string
							string jsonFileString = webClient.DownloadString(resultJsonFileUrl);

							JArray resultFilesUrls = JArray.Parse(jsonFileString);

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

								webClient.DownloadFile(resultFileUrl, localFileName);

								Console.WriteLine("Downloaded \"{0}\".", localFileName);
								page++;
							}
							break;
						}
						else if (status == "InProgress")
						{
							// 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())
			{
				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"]);
			}
		}
	}
}

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