ByteScout Cloud API Server – PDF To Image API – C# – Convert PDF To PNG From Uploaded File

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Program.cs

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

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

			// 1. RETRIEVE THE PRESIGNED URL TO UPLOAD THE FILE.
			// * If you already have a direct file URL, skip to the step 3.
			
			// 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)));

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

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

				if (json["error"].ToObject<bool>() == false)
				{
					// Get URL to use for the file upload
					string uploadUrl = json["presignedUrl"].ToString();
					// Get URL of uploaded file to use with later API calls
					string uploadedFileUrl = json["url"].ToString();

					// 2. UPLOAD THE FILE TO CLOUD.

					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

					// 3. CONVERT UPLOADED PDF FILE TO PNG

					// Prepare URL for `PDF To PNG` API call
					query = Uri.EscapeUriString(string.Format(
						"https://localhost/pdf/convert/to/png?password={0}&pages={1}&url={2}",
						Password,
						Pages,
						uploadedFileUrl));

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

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

					if (json["error"].ToObject<bool>() == false)
					{
						// Download generated PNG files
						int page = 1;
						foreach (JToken token in json["urls"])
						{
							string resultFileUrl = token.ToString();
							string localFileName = String.Format(@".\page{0}.png", page);

							webClient.DownloadFile(resultFileUrl, localFileName);

							Console.WriteLine("Downloaded \"{0}\".", localFileName);
							page++;
						}
					}
					else
					{
						Console.WriteLine(json["message"].ToString());
					}
				}
				else
				{
					Console.WriteLine(json["message"].ToString());
				}
			}
			catch (WebException e)
			{
				Console.WriteLine(e.ToString());
			}

			webClient.Dispose();

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

    

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packages.config

      
<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="Newtonsoft.Json" version="10.0.3" 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