Imports System.IO
Imports System.Net
Imports System.Threading
Imports Newtonsoft.Json
Imports Newtonsoft.Json.Linq


' Cloud API asynchronous "PDF To CSV" job example.
' Allows to avoid timeout errors when processing huge or scanned PDF documents.

Module Module1

    ' The authentication key (API Key).
    ' Get your own by registering at https://app.pdf.co
    Const API_KEY As String = "********************************"

    ' Direct URL of source PDF file.
    ' You can also upload your own file into PDF.co and use it as url. Check "Upload File" samples for code snippets: https://github.com/bytescout/pdf-co-api-samples/tree/master/File%20Upload/   
    Const SourceFileUrl As String = "https://bytescout-com.s3.amazonaws.com/files/demo-files/cloud-api/pdf-to-csv/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 CSV file name
	Const DestinationFile As String = ".\result.csv"

    ' Some of advanced options available through profiles:
    ' (JSON can be single/double-quoted and contain comments.)
    ' {
    ' 	"profiles": [
    ' 		{
    ' 			"profile1": {
    ' 				"CSVSeparatorSymbol": ",", // Separator symbol.
    ' 				"CSVQuotaionSymbol": "\"", // Quotation symbol.
    ' 				"ExtractInvisibleText": true, // Invisible text extraction. Values: true / false
    ' 				"ExtractShadowLikeText": true, // Shadow-like text extraction. Values: true / false
    ' 				"LineGroupingMode": "None", // Values: "None", "GroupByRows", "GroupByColumns", "JoinOrphanedRows"
    ' 				"ColumnDetectionMode": "ContentGroupsAndBorders", // Values: "ContentGroupsAndBorders", "ContentGroups", "Borders", "BorderedTables"
    ' 				"Unwrap": false, // Unwrap grouped text in table cells. Values: true / false
    ' 				"ShrinkMultipleSpaces": false, // Shrink multiple spaces in table cells that affect column detection. Values: true / false
    ' 				"DetectNewColumnBySpacesRatio": 1, // Spacing ratio that affects column detection.
    ' 				"CustomExtractionColumns": [ 0, 50, 150, 200, 250, 300 ], // Explicitly specify columns coordinates for table extraction.
    ' 				"CheckPermissions": true, // Ignore document permissions. Values: true / false
    ' 			}
    ' 		}
    ' 	]
    ' }


    ' Sample profile that sets advanced conversion options.
    ' Advanced options are properties of CSVExtractor class from ByteScout PDF Extractor SDK used in the back-end:
    ' https://cdn.bytescout.com/help/BytescoutPDFExtractorSDK/html/87ce5fa6-3143-167d-abbd-bc7b5e160fe5.htm
    ReadOnly Profiles As String = File.ReadAllText("profile.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)

        ' Set JSON content type
        webClient.Headers.Add("Content-Type", "application/json")

        ' Prepare URL for `PDF To CSV` API call
		Dim url As String = "https://api.pdf.co/v1/pdf/convert/to/csv"

        ' Prepare requests params as JSON
        ' See documentation: https : //apidocs.pdf.co
        Dim parameters As New Dictionary(Of String, Object)
		parameters.Add("name", Path.GetFileName(DestinationFile))
		parameters.Add("password", Password)
		parameters.Add("pages", Pages)
		parameters.Add("url", SourceFileUrl)
		parameters.Add("profiles", Profiles)

        ' Convert dictionary of params to JSON
        Dim jsonPayload As String = JsonConvert.SerializeObject(parameters)

        Try
            ' Execute POST request with JSON payload
            Dim response As String = webClient.UploadString(url, jsonPayload)

			' Parse JSON response
			Dim json As JObject = JObject.Parse(response)

			If json("error").ToObject(Of Boolean) = False Then

                ' Get URL of generated CSV file
                Dim resultFileUrl = json("url").ToString()

                ' Download CSV file
                webClient.DownloadFile(resultFileUrl, DestinationFile)

                Console.WriteLine("Generated CSV file saved as {0}", DestinationFile)

            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

End Module

{
  "profiles": [
    {
      "profile1": {
        "OCRMode": "TextFromImagesAndVectorsAndFonts",
        "CSVSeparatorSymbol": "|"
      }
    }
  ]
}