PDF.co Web API - DOC To PDF API - VB.NET - Convert DOC To PDF From URL Asynchronously - ByteScout

PDF.co Web API – DOC To PDF API – VB.NET – Convert DOC To PDF From URL Asynchronously

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PDF.co Web API – DOC To PDF API – VB.NET – Convert DOC To PDF From URL Asynchronously

Module1.vb

[vb]
Imports System.IO
Imports System.Net
Imports System.Threading
Imports Newtonsoft.Json.Linq

‘ Cloud API asynchronous “DOC To PDF” 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/documentation/api
Const API_KEY As String = “***********************************”

‘ Direct URL of source DOC or DOCX file.
Const SourceFileUrl As String = “https://s3-us-west-2.amazonaws.com/bytescout-com/files/demo-files/cloud-api/doc-to-pdf/sample.docx”
‘ Destination PDF file name
Const DestinationFile As String = “.\result.pdf”
‘ (!) 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 `DOC To PDF` API call
Dim query As String = Uri.EscapeUriString(String.Format(
“https://api.pdf.co/v1/pdf/convert/from/doc?name={0}&url={1}&async={2}”,
Path.GetFileName(DestinationFile),
SourceFileUrl,
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 PDF 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 As String = CheckJobStatus(jobId) ‘ Possible statuses: “InProgress”, “Failed”, “Aborted”, “Finished”.

‘ Display timestamp and status (for demo purposes)
Console.WriteLine(DateTime.Now.ToLongTimeString() + “: ” + status)

If status = “Finished” Then

‘ Download PDF file
webClient.DownloadFile(resultFileUrl, DestinationFile)

Console.WriteLine(“Generated PDF file saved as “”{0}”” file.”, DestinationFile)
Exit Do

ElseIf status = “InProgress” 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(jobId As String) As String

Using webClient As WebClient = New WebClient()

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

[/vb]


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