ByteScout Cloud API Server – DOC To PDF API – VB.NET – Convert DOC To PDF From URL Asynchronously

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ByteScout Cloud API Server – DOC To PDF API – VB.NET – Convert DOC To PDF From URL Asynchronously

printable version:
ByteScout-Cloud-API-Server-VB-NET-Convert-DOC-To-PDF-From-URL-Asynchronously.pdf

How to convert DOC to PDF from URL asynchronously for DOC to PDF API in VB.NET and ByteScout Cloud API Server

ByteScout Cloud API Server: API server that is ready to use and can be installed and deployed in less than 30 minutes on your own Windows server or server in a cloud. It can save data and files on your local server-based file storage or in Amazon AWS S3 storage. Data is processed solely on the API server and is powered by ByteScout engine, no cloud services or Internet connection is required for data processing..

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ByteScoutWebApiExample.sln

      
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ByteScoutWebApiExample.vbproj

      <?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
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    <ProjectGuid>{9B91124C-66C3-4BD9-B29E-168C1ABB15AC}</ProjectGuid>
    <OutputType>Exe</OutputType>
    <StartupObject>ByteScoutWebApiExample.Module1</StartupObject>
    <RootNamespace>ByteScoutWebApiExample</RootNamespace>
    <AssemblyName>ByteScoutWebApiExample</AssemblyName>
    <FileAlignment>512</FileAlignment>
    <MyType>Console</MyType>
    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
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    <DocumentationFile>ByteScoutWebApiExample.xml</DocumentationFile>
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Module1.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.

' Please NOTE: In this sample we're assuming Cloud Api Server is hosted at "https://localhost". 
' If it's not then please replace this with with your hosting url.

Module Module1

 	' Direct URL of source DOC or DOCX file.
	Const SourceFileUrl As String = "https://bytescout-com.s3.amazonaws.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()

		' Prepare URL for `DOC To PDF` API call
		Dim query As String = Uri.EscapeUriString(String.Format(
			"https://localhost/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: "working", "failed", "aborted", "success".

					' Display timestamp and status (for demo purposes)
					Console.WriteLine(DateTime.Now.ToLongTimeString() + ": " + status)

					If status = "success" Then
						
						' Download PDF file
						webClient.DownloadFile(resultFileUrl, DestinationFile)

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

					ElseIf status = "working" 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://localhost/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

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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printable version:
ByteScout-Cloud-API-Server-VB-NET-Convert-DOC-To-PDF-From-URL-Asynchronously.pdf