Cloud API - PDF Merging - VB.NET - Merge PDF Documents From URLs Asynchronously - ByteScout
Announcement
Our ByteScout SDK products are sunsetting as we focus on expanding new solutions.
Learn More Open modal
Close modal
Announcement Important Update
ByteScout SDK Sunsetting Notice
Our ByteScout SDK products are sunsetting as we focus on our new & improved solutions. Thank you for being part of our journey, and we look forward to supporting you in this next chapter!
PDF.co
Introducing PDF.co
Try PDF.co for document processing & automation via Web APIs
Learn More Service link
MuPDF
Introducing MuPDF
Try MuPDF.NET for advanced document processing solutions in your .NET environment
Learn More Service link
Contact Sales Contact Support    
×

Cloud API – PDF Merging – VB.NET – Merge PDF Documents From URLs Asynchronously

  • Home
  • /
  • Articles
  • /
  • Cloud API – PDF Merging – VB.NET – Merge PDF Documents From URLs Asynchronously

Cloud API – PDF Merging – VB.NET – Merge PDF Documents From URLs Asynchronously

Module1.vb

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
Imports System.IO
Imports System.Net
Imports System.Threading
Imports Newtonsoft.Json.Linq
 
 
' Cloud API asynchronous "Merge PDF" job example.
' Allows to avoid timeout errors when processing huge or scanned PDF documents.
 
Module Module1
 
    ' (!) If you are getting '(403) Forbidden' error please ensure you have set the correct API_KEY
 
    ' The authentication key (API Key).
    ' Get your own by registering at https://secure.bytescout.com/users/sign_up
    Const API_KEY As String = "***********************************"
 
    ' Direct URLs of PDF files to merge
    Dim SourceFiles As String() = {
        "https://s3-us-west-2.amazonaws.com/bytescout-com/files/demo-files/cloud-api/pdf-merge/sample1.pdf",
        "https://s3-us-west-2.amazonaws.com/bytescout-com/files/demo-files/cloud-api/pdf-merge/sample2.pdf"}
    ' 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 `Merge PDF` API call
        Dim query As String = Uri.EscapeUriString(String.Format(
            "https://api.pdf.co/v1/pdf/merge?name={0}&url={1}&async={2}",
            Path.GetFileName(DestinationFile),
            String.Join(",", SourceFiles),
            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

  Click here to get your Free Trial version of the SDK

Tutorials:

prev
next

IMPORTANT:
Cloud API is deprecated and was replaced with more powerful and secure www.PDF.co Web API

CLICK HERE
TO LEARN MORE
ABOUT NEW
www.PDF.co
w/ Web API

On-Premise API Server
Cloud API Server