Cloud API – PDF To JSON API – VB.NET – Convert PDF To JSON From Uploaded File

Cloud API – PDF To JSON API – VB.NET – Convert PDF To JSON From Uploaded File

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 JSON file name
	const DestinationFile as String = ".\result.json"

	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 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. CONVERT UPLOADED PDF FILE TO JSON

				' Prepare URL for `PDF To JSON` API call
				query = Uri.EscapeUriString(String.Format(
					"https://api.pdf.co/v1/pdf/convert/to/json?name={0}&password={1}&pages={2}&url={3}",
					Path.GetFileName(DestinationFile),
					Password,
					Pages,
					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 JSON file
					Dim resultFileUrl As string = json("url").ToString()

					' 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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