How to PDF text search API in VB.NET with PDF.co Web API

Tutorial on how to PDF text search API in VB.NET

The coding tutorials are designed to help you test the features without need to write your own code. 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 and you can use it to PDF text search API with VB.NET.

This code snippet below for PDF.co Web API works best when you need to quickly PDF text search API in your VB.NET application. Just copy and paste the code into your VB.NET application’s code and follow the instruction. Enjoy writing a code with ready-to-use sample VB.NET codes.

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Module1.vb
      
Imports System.IO Imports System.Net Imports System.Threading 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 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() ' Set API Key webClient.Headers.Add("x-api-key", API_KEY) ' Prepare URL for PDF text search API call. ' See documentation: https : //app.pdf.co/documentation/api/1.0/pdf/find.html Dim query As String = Uri.EscapeUriString( String.Format("https://api.pdf.co/v1/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 ' Set API Key webClient.Headers.Add("x-api-key", API_KEY) Dim url As String = "https://api.pdf.co/v1/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>

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