Convert Images To PDF From Uploaded Files | C# | Image To PDF APIByteScout PDF SDK

Convert Images To PDF From Uploaded Files | C# | Image To PDF API

Program.cs:

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

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 image files
        static string[] ImageFiles = new string[] { @".\image1.png", @".\image2.jpg" };
        // Destination PDF file name
        const string DestinationFile = @".\result.pdf";

        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);

            // 1. UPLOAD FILES TO CLOUD

            List<string> uploadedFiles = new List<string>();

            try
            {
                foreach (string imageFile in ImageFiles)
                {
                    // 1a. RETRIEVE THE PRESIGNED URL TO UPLOAD THE FILE.

                    // Prepare URL for `Get Presigned URL` API call
                    string query = Uri.EscapeUriString(string.Format(
                        "https://api.pdf.co/v1/file/upload/get-presigned-url?contenttype=application/octet-stream&name={0}",
                        Path.GetFileName(imageFile)));

                    // 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();

                        // 1b. UPLOAD THE FILE TO CLOUD.

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

                        uploadedFiles.Add(uploadedFileUrl);
                    }
                    else
                    {
                        Console.WriteLine(json["message"].ToString());
                    }
                }

                if (uploadedFiles.Count > 0)
                {
                    // 2. CREATE PDF DOCUMENT FROM UPLOADED IMAGE FILES

                    // Prepare URL for `Image To PDF` API call
                    string query = Uri.EscapeUriString(string.Format(
                        "https://api.pdf.co/v1/pdf/convert/from/image?name={0}&url={1}",
                        Path.GetFileName(DestinationFile),
                        string.Join(",", uploadedFiles)));

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

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

                    if (json["error"].ToObject<bool>() == false)
                    {
                        // Get URL of generated PDF file
                        string resultFileUrl = json["url"].ToString();

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

                        Console.WriteLine("Generated PDF file saved as \"{0}\" file.", DestinationFile);
                    }
                    else
                    {
                        Console.WriteLine(json["message"].ToString());
                    }
                }
            }
            catch (WebException e)
            {
                Console.WriteLine(e.ToString());
            }

            webClient.Dispose()


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