Cloud API – Barcode Reader – C# – Read Barcode From Uploaded File

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Cloud API – Barcode Reader – C# – Read Barcode From Uploaded File

Program.cs

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

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 file name
		const string SourceFile = @".\sample.pdf";
		// Comma-separated list of barcode types to search. 
		// See valid barcode types in the documentation https://secure.bytescout.com/cloudapi.html#api-Default-barcodeReadFromUrlGet
		const string BarcodeTypes = "Code128,Code39,Interleaved2of5,EAN13";
		// Comma-separated list of page indices (or ranges) to process. Leave empty for all pages. Example: '0,2-5,7-'.
		const string Pages = "";

		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. 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://bytescout.io/v1/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. READ BARCODES FROM UPLOADED FILE

					// Prepare URL for `Barcode Reader` API call
					query = Uri.EscapeUriString(string.Format(
						"https://bytescout.io/v1/barcode/read/from/url?types={0}&pages={1}&url={2}",
						BarcodeTypes,
						Pages,
						uploadedFileUrl));

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

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

					if (json["error"].ToObject<bool>() == false)
					{
						// Display found barcodes in console
						foreach (JToken token in json["barcodes"])
						{
							Console.WriteLine("Found barcode:");
							Console.WriteLine("  Type: " + token["TypeName"]);
							Console.WriteLine("  Value: " + token["Value"]);
							Console.WriteLine("  Document Page Index: " + token["Page"]);
							Console.WriteLine("  Rectangle: " + token["Rect"]);
							Console.WriteLine("  Confidence: " + token["Confidence"]);
							Console.WriteLine();
						}
					}
					else
					{
						// Display service reported error
						Console.WriteLine(json["message"].ToString());
					}
				}
				else
				{
					// Display service reported error
					Console.WriteLine(json["message"].ToString());
				}
			}
			catch (WebException e)
			{
				// Display request error
				Console.WriteLine(e.ToString());
			}

			webClient.Dispose();


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


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