Important Update
On this page, you will find sample source codes which show you how to handle a complex task, such as, PDF to JSON API in VB.NET. ByteScout Cloud API Server helps with PDF to JSON API in VB.NET. ByteScout Cloud API Server is the ready to deploy Web API Server that can be deployed in less than thirty minutes into your own in-house Windows server (no Internet connnection is required to process data!) or into private cloud server. Can store data on in-house local server based storage or in Amazon AWS S3 bucket. Processing data solely on the server using built-in ByteScout powered engine, no cloud services are used to process your data!.
Use the code displayed below in your application to save a lot of time on writing and testing code. This VB.NET sample code can be used by copying and pasting into your project. Once done,just compile your project and click Run. You can use these VB.NET sample examples in one or many applications.
Trial version of ByteScout is available for free download from our website. This and other source code samples for VB.NET and other programming languages are available.
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Imports System.IO
Imports System.Net
Imports System.Threading
Imports Newtonsoft.Json.Linq
' Please NOTE: In this sample we're assuming Cloud Api Server is hosted at "https://localhost".
' If it's not then please replace this with with your hosting url.
' Cloud API asynchronous "PDF To JSON" job example.
' Allows to avoid timeout errors when processing huge or scanned PDF documents.
Module Module1
' Direct URL of source PDF file.
Const SourceFileUrl As String = "https://bytescout-com.s3.amazonaws.com/files/demo-files/cloud-api/pdf-to-json/sample.pdf"
' Comma-separated list of page indices (or ranges) to process. Leave empty for all pages. Example: '0,2-5,7-'.
Const Pages As String = ""
' PDF document password. Leave empty for unprotected documents.
Const Password As String = ""
' Destination JSON file name
Const DestinationFile As String = ".\result.json"
' (!) Make asynchronous job
Const Async As Boolean = True
Sub Main()
' Create standard .NET web client instance
Dim webClient As WebClient = New WebClient()
' Prepare URL for `PDF To JSON` API call
Dim query As String = Uri.EscapeUriString(String.Format(
"https://localhost/pdf/convert/to/json?name={0}&password={1}&pages={2}&url={3}&async={4}",
Path.GetFileName(DestinationFile),
Password,
Pages,
SourceFileUrl,
Async))
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
' Asynchronous job ID
Dim jobId As String = json("jobId").ToString()
' URL of generated JSON file that will available after the job completion
Dim resultFileUrl As String = 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
Dim status As String = CheckJobStatus(jobId) ' Possible statuses: "working", "failed", "aborted", "success".
' Display timestamp and status (for demo purposes)
Console.WriteLine(DateTime.Now.ToLongTimeString() + ": " + status)
If status = "success" Then
' Download JSON file
webClient.DownloadFile(resultFileUrl, DestinationFile)
Console.WriteLine("Generated JSON file saved as ""{0}"" file.", DestinationFile)
Exit Do
ElseIf status = "working" Then
' Pause for a few seconds
Thread.Sleep(3000)
Else
Console.WriteLine(status)
Exit Do
End If
Loop
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
Function CheckJobStatus(jobId As String) As String
Using webClient As WebClient = New WebClient()
Dim url As String = "https://localhost/job/check?jobid=" + jobId
Dim response As String = webClient.DownloadString(url)
Dim json As JObject = JObject.Parse(response)
Return Convert.ToString(json("status"))
End Using
End Function
End Module
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<?xml version="1.0" encoding="utf-8"?>
<packages>
<package id="Newtonsoft.Json" version="10.0.3" targetFramework="net40" />
</packages>
60 Day Free Trial or Visit ByteScout Cloud API Server Home Page
Explore ByteScout Cloud API Server Documentation
Explore Samples
Sign Up for ByteScout Cloud API Server Online Training
Get Your API Key
Explore Web API Docs
Explore Web API Samples
60 Day Free Trial or Visit ByteScout Cloud API Server Home Page
Explore ByteScout Cloud API Server Documentation
Explore Samples
Sign Up for ByteScout Cloud API Server Online Training
Get Your API Key
Explore Web API Docs
Explore Web API Samples