How to convert PDF to HTML from uploaded file for PDF to HTML API in VB.NET using PDF.co Web API

How to convert PDF to HTML from uploaded file for PDF to HTML API in VB.NET: How To Tutorial

Source code documentation samples provide quick and easy way to add a required functionality into your application. PDF.co Web API helps with PDF to HTML 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.

You will save a lot of time on writing and testing code as you may just take the code below and use it in your application. Open your VB.NET project and simply copy & paste the code and then run your app! 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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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 = "***********************************" ' Source PDF file const SourceFile as String = ".\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 HTML file name const DestinationFile as String = ".\result.html" ' Set to `true` to get simplified HTML without CSS. Default is the rich HTML keeping the document design. const PlainHtml as Boolean = False ' Set to `true` if your document has the column layout like a newspaper. const ColumnLayout as Boolean = False 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) ' 1. RETRIEVE THE PRESIGNED URL TO UPLOAD THE FILE. ' * If you already have the 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. CONVERT UPLOADED PDF FILE TO HTML ' Prepare URL for `PDF To HTML` API call query = Uri.EscapeUriString(String.Format( "https://api.pdf.co/v1/pdf/convert/to/html?name={0}&password={1}&pages={2}&simple={3}&columns={4}&url={5}", Path.GetFileName(DestinationFile), Password, Pages, PlainHtml, ColumnLayout, uploadedFileUrl)) ' Execute request response = webClient.DownloadString(query) ' Parse JSON response json = JObject.Parse(response) If json("error").ToObject(Of Boolean) = False Then ' Get URL of generated HTML file Dim resultFileUrl As string = json("url").ToString() ' Download HTML file webClient.DownloadFile(resultFileUrl, DestinationFile) Console.WriteLine("Generated HTML 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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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

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Explore PDF.co Web API Documentation

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ON-DEMAND REST WEB API

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ON-PREMISE OFFLINE SDK

60 Day Free Trial or Visit PDF.co Web API Home Page

Explore PDF.co Web API Documentation

Explore Samples

Sign Up for PDF.co Web API Online Training

ON-DEMAND REST WEB API

Get Your API Key

Explore Web API Docs

Explore Web API Samples

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