How to parse uploaded file for document parser API in VB.NET using PDF.co Web API

How to parse uploaded file for document parser API in VB.NET: Step By Step Instructions

If you want a quick and easy way to add a required functionality into your application then check this sample source code documentation. PDF.co Web API helps with document parser 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.

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. Easy to understand tutorials are available along with installed PDF.co Web API if you’d like to learn more about the topic and the details of the API.

Our website provides free trial version of PDF.co Web API that gives source code samples to assist with your VB.NET project.

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Module1.vb
      
Imports System.Collections.Specialized Imports System.IO Imports System.Net Imports System.Text 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 = "***********************************" ' Source PDF file Const SourceFile As String = ".\MultiPageTable.pdf" ' PDF document password. Leave empty for unprotected documents. Const Password As String = "" ' Destination TXT file name Const DestinationFile As String = ".\result.json" Sub Main() ' Template text. Use Document Parser SDK (https//bytescout.com/products/developer/documentparsersdk/index.html) ' to create templates. ' Read template from file Dim templateText As String = File.ReadAllText("MultiPageTable-template1.yml") ' Create standard .NET web client instance Dim webClient As WebClient = New WebClient() ' Set API Key webClient.Headers.Add("x-api-key", API_KEY) ' 1. RETRIEVE THE PRESIGNED URL TO UPLOAD THE FILE. ' * If you already have a direct file URL, skip to the step 3. ' Prepare URL for `Get Presigned URL` API call Dim query As String = Uri.EscapeUriString(String.Format( "https://api.pdf.co/v1/file/upload/get-presigned-url?contenttype=application/octet-stream&name={0}", Path.GetFileName(SourceFile))) 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 ' Get URL to use for the file upload Dim uploadUrl As String = json("presignedUrl").ToString() ' Get URL of uploaded file to use with later API calls Dim uploadedFileUrl As String = json("url").ToString() ' 2. UPLOAD THE FILE TO CLOUD. webClient.Headers.Add("content-type", "application/octet-stream") webClient.UploadFile(uploadUrl, "PUT", SourceFile) ' You can use UploadData() instead if your file is byte array or Stream ' 3. PARSE UPLOADED PDF DOCUMENT ' URL for `Document Parser` API call query = "https://api.pdf.co/v1/pdf/documentparser" Dim requestBody As New NameValueCollection() requestBody.Add("url", uploadedFileUrl) requestBody.Add("template", templateText) ' Execute request Dim responseBytes As Byte() = webClient.UploadValues(query, "POST", requestBody) response = Encoding.UTF8.GetString(responseBytes) ' Parse JSON response json = JObject.Parse(response) If json("error").ToObject(Of Boolean) = False Then ' Get URL of generated JSON file Dim resultFileUrl As String = json("url") ' Download JSON file webClient.DownloadFile(resultFileUrl, DestinationFile) Console.WriteLine("Generated JSON file saved as {0} file.", DestinationFile) Else Console.WriteLine(json("message").ToString()) End If 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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MultiPageTable-template1.yml
      
--- # Template that demonstrates parsing of multi-page table using only # regular expressions for the table start, end, and rows. # If regular expression cannot be written for every table row (for example, # if the table contains empty cells), try the second method demonstrated # in `MultiPageTable-template2.yml` template. templateVersion: 2 templatePriority: 0 sourceId: Multipage Table Test detectionRules: keywords: - Sample document with multi-page table fields: total: expression: TOTAL {{DECIMAL}} tables: - name: table1 start: # regular expression to find the table start in document expression: Item\s+Description\s+Price\s+Qty\s+Extended Price end: # regular expression to find the table end in document expression: TOTAL\s+\d+\.\d\d row: # regular expression to find table rows expression: '^\s*(?<itemNo>\d+)\s+(?<description>.+?)\s+(?<price>\d+\.\d\d)\s+(?<qty>\d+)\s+(?<extPrice>\d+\.\d\d)' columns: - name: itemNo type: integer - name: description type: string - name: price type: decimal - name: qty type: integer - name: extPrice type: decimal multipage: true

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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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