PDF.co Web API - PDF Merging API - VB.NET - Merge PDF Documents From Uploaded Files - ByteScout

PDF.co Web API – PDF Merging API – VB.NET – Merge PDF Documents From Uploaded Files

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PDF.co Web API – PDF Merging API – VB.NET – Merge PDF Documents From Uploaded Files

Module1.vb

[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 files
Dim SourceFiles as String() = { “.\sample1.pdf”, “.\sample2.pdf” }
‘ Destination PDF file name
const DestinationFile as string = “.\result.pdf”

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. UPLOAD FILES TO CLOUD

Dim uploadedFiles As List(Of String) = New List(Of String)()

Try

For Each pdfFile As String In SourceFiles

‘ 1a. RETRIEVE THE PRESIGNED URL TO UPLOAD THE FILE.

‘ 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(pdfFile)))

‘ 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()

‘ 1b. UPLOAD THE FILE TO CLOUD.

webClient.Headers.Add(“content-type”, “application/octet-stream”)
webClient.UploadFile(uploadUrl, “PUT”, pdfFile) ‘ You can use UploadData() instead if your file is byte array or Stream

uploadedFiles.Add(uploadedFileUrl)

Else
Console.WriteLine(json(“message”).ToString())
End If

Next

if uploadedFiles.Count > 0 Then

‘ 2. MERGE UPLOADED PDF DOCUMENTS

‘ 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}”,
Path.GetFileName(DestinationFile),
string.Join(“,”, uploadedFiles)))

‘ 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 of generated PDF file
Dim resultFileUrl As string = json(“url”).ToString()

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

Console.WriteLine(“Generated PDF 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

[/vb]


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