ByteScout Cloud API Server - PDF Text Search API - VB.NET - PDF Text Search from URL Asynchronously - ByteScout

ByteScout Cloud API Server – PDF Text Search API – VB.NET – PDF Text Search from URL Asynchronously

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How to PDF text search API in VB.NET and ByteScout Cloud API Server

Learning is essential in computer world and the tutorial below will demonstrate how to PDF text search API in VB.NET

This sample source code below will display you how to PDF text search API in VB.NET. ByteScout Cloud API Server is API server that is ready to use and can be installed and deployed in less than 30 minutes on your own Windows server or server in a cloud. It can save data and files on your local server-based file storage or in Amazon AWS S3 storage. Data is processed solely on the API server and is powered by ByteScout engine, no cloud services or Internet connection is required for data processing.. It can be applied to PDF text search API using VB.NET.

Want to quickly learn? This fast application programming interfaces of ByteScout Cloud API Server for VB.NET plus the guidelines and the code below will help you quickly learn how to PDF text search API. Follow the instructions from scratch to work and copy the VB.NET code. Further improvement of the code will make it more robust.

ByteScout provides the free trial version of ByteScout Cloud API Server along with the documentation and source code samples.

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Module1.vb
      
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. 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-text/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 = "" ' Search string. Const SearchString As String = "\d{1,}\.\d\d" 'Regular expression To find numbers Like '100.00' ' Note: Do Not use `+` char in regex, but use `{1,}` instead. ' `+` char Is valid for URL And will Not be escaped, And it will become a space char on the server side. ' Enable regular expressions (Regex) Const RegexSearch As Boolean = True '(!) 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 text search API call. Dim query As String = Uri.EscapeUriString( String.Format("https://localhost/pdf/find?password={0}&pages={1}&url={2}&searchString={3}&regexSearch={4}&async={5}", Password, Pages, SourceFileUrl, SearchString, RegexSearch, 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 = CheckJobStatus(jobId) ' Possible statuses: "working", "failed", "aborted", "success". ' Display timestamp and status (for demo purpose) Console.WriteLine(DateTime.Now.ToLongTimeString() + ": " + status) If (status = "success") Then ' Execute request Dim respFileJson As String = webClient.DownloadString(resultFileUrl) ' Parse JSON response Dim jsonFoundInformation As JArray = JArray.Parse(respFileJson) ' Display found information in console For Each item As JToken In jsonFoundInformation Console.WriteLine({code}quot;Found text {item("text")} at coordinates {item("left")}, {item("top")}") Next 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(ByVal jobId As String) Using webClient As 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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packages.config
      
<?xml version="1.0" encoding="utf-8"?> <packages> <package id="Newtonsoft.Json" version="10.0.3" targetFramework="net40" /> </packages>

ON-PREMISE OFFLINE SDK

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

ON-DEMAND REST WEB API

Get Your API Key

Explore Web API Docs

Explore Web API Samples

VIDEO

ON-PREMISE OFFLINE SDK

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

ON-DEMAND REST WEB API

Get Your API Key

Explore Web API Docs

Explore Web API Samples

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