PDF.co Web API - Barcode Reader API - C# - Read Barcode From URL Asynchronously - ByteScout

PDF.co Web API – Barcode Reader API – C# – Read Barcode From URL Asynchronously

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PDF.co Web API – Barcode Reader API – C# – Read Barcode From URL Asynchronously

Program.cs

[csharp]
using System;
using System.IO;
using System.Net;
using System.Threading;
using System.Threading.Tasks;
using Newtonsoft.Json.Linq;

// Cloud API asynchronous “Barcode Reader” job example.
// Allows to avoid timeout errors when processing huge or scanned PDF documents.

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 = “***********************************”;

// Direct URL of source file (image or PDF) to search barcodes in.
const string SourceFileURL = “https://s3-us-west-2.amazonaws.com/bytescout-com/files/demo-files/cloud-api/barcode-reader/sample.pdf”;
// Comma-separated list of barcode types to search.
// See valid barcode types in the documentation https://app.pdf.co/documentation/api/1.0/barcode/read_from_url.html
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 = “”;
// (!) 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);

// Prepare URL for `Barcode Reader` API call
string query = Uri.EscapeUriString(string.Format(“https://api.pdf.co/v1/barcode/read/from/url?types={0}&pages={1}&url={2}&async={3}”,
BarcodeTypes,
Pages,
SourceFileURL,
Async));

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

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

if (json[“error”].ToObject() == false)
{
// Asynchronous job ID
string jobId = json[“jobId”].ToString();
// URL of generated JSON file with decoded barcodes that will available after the job completion
string resultFileUrl = 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 results file as string
string jsonFileString = webClient.DownloadString(resultFileUrl);

JArray jsonFoundBarcodes = JArray.Parse(jsonFileString);

// Display found barcodes in console
foreach (JToken token in jsonFoundBarcodes)
{
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();
}
break;
}
else if (status == “InProgress”)
{
// Pause for a few seconds
Thread.Sleep(3000);
}
else
{
Console.WriteLine(status);
break;
}
}
while (true);
}
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();
}

static string CheckJobStatus(string jobId)
{
using (WebClient webClient = new WebClient())
{
// Set API Key
webClient.Headers.Add(“x-api-key”, API_KEY);

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”]);
}
}
}
}

[/csharp]


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