How to read barcode from URL for barcode reader API in VB.NET with PDF.co Web API

Learn how to read barcode from URL to have barcode reader API in VB.NET

Sample source codes below will show you how to cope with a difficult task, for example, barcode reader API in VB.NET. PDF.co Web API was made to help with barcode reader API in VB.NET. PDF.co Web API is the Rest API that provides set of data extraction functions, tools for documents manipulation, splitting and merging of pdf files. Includes built-in OCR, images recognition, can generate and read barcodes from images, scans and pdf.

This rich sample source code in VB.NET for PDF.co Web API includes the number of functions and options you should do calling the API to implement barcode reader API. Open your VB.NET project and simply copy & paste the code and then run your app! Enjoy writing a code with ready-to-use sample VB.NET codes to implement barcode reader API using PDF.co Web API.

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

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Module1.vb
      
Imports System.IO Imports System.Net Imports Newtonsoft.Json.Linq Module Module1 ' The authentication key (API Key). ' Get your own by registering at https://app.pdf.co/documentation/api Const API_KEY As String = "***********************************" ' Direct URL of source file to search barcodes in. Const SourceFileURL As String = "https://bytescout-com.s3.amazonaws.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 BarcodeTypes As String = "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 Pages As String = "" Sub Main() ' Create standard .NET web client instance Dim webClient As WebClient = New WebClient() ' Set API Key webClient.Headers.Add("x-api-key", API_KEY) ' Prepare URL for `Barcode Reader` API call Dim query As String = Uri.EscapeUriString(String.Format( "https://api.pdf.co/v1/barcode/read/from/url?types={0}&pages={1}&url={2}", BarcodeTypes, Pages, SourceFileURL)) Try ' Execute request Dim response As String = webClient.DownloadString(query) ' Parse JSON response Dim json As JObject = JObject.Parse(response) If json("error").ToObject(Of Boolean) = False Then ' Display found barcodes in console For Each token As JToken In json("barcodes") Console.WriteLine("Found barcode:") Console.WriteLine(" Type: " + token("TypeName").ToString()) Console.WriteLine(" Value: " + token("Value").ToString()) Console.WriteLine(" Document Page Index: " + token("Page").ToString()) Console.WriteLine(" Rectangle: " + token("Rect").ToString()) Console.WriteLine(" Confidence: " + token("Confidence").ToString()) Console.WriteLine() Next Else Console.WriteLine(json("message").ToString()) End If Catch ex As WebException Console.WriteLine(ex.ToString()) End Try webClient.Dispose() Console.WriteLine() Console.WriteLine("Press any key...") Console.ReadKey() End Sub End Module

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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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