How to convert images to PDF from uploaded files for image to PDF API in C# using PDF.co Web API

Learn how to convert images to PDF from uploaded files to have image to PDF API in C#

Sample source codes below will show you how to cope with a difficult task, for example, image to PDF API in C#. PDF.co Web API was made to help with image to PDF API in C#. PDF.co Web API is the Web API with a set of tools for documents manipulation, data conversion, data extraction, splitting and merging of documents. Includes image recognition, built-in OCR, barcode generation and barcode decoders to decode bar codes from scans, pictures and pdf.

You will save a lot of time on writing and testing code as you may just take the code below and use it in your application. Open your C# project and simply copy & paste the code and then run your app! Further enhancement of the code will make it more vigorous.

PDF.co Web API – free trial version is on available our website. Also, there are other code samples to help you with your C# application included into trial version.

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Program.cs
      
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(); } } }

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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>

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