How to merge PDF documents from uploaded files for PDF merging API in VB.NET and PDF.co Web API

Learn how to merge PDF documents from uploaded files to have PDF merging API in VB.NET

Source code documentation samples provide quick and easy way to add a required functionality into your application. PDF.co Web API was made to help with PDF merging API in VB.NET. PDF.co Web API is the Rest API that provides set of data extraction functions, tools for documents manipulation, splitting and merging of pdf files. Includes built-in OCR, images recognition, can generate and read barcodes from images, scans and pdf.

VB.NET code samples for VB.NET developers help to speed up the application’s code writing when using PDF.co Web API. For implimentation of this functionality, please copy and paste code below into your app using code editor. Then compile and run your app. Test VB.NET sample code examples whether they respond your needs and requirements for the project.

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Module1.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

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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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