PDF.co Web API – Image To PDF API – VB.NET – Convert Images To PDF From Uploaded Files

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ByteScoutWebApiExample.sln

      

Microsoft Visual Studio Solution File, Format Version 12.00
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VisualStudioVersion = 15.0.26730.10
MinimumVisualStudioVersion = 10.0.40219.1
Project("{F184B08F-C81C-45F6-A57F-5ABD9991F28F}") = "ByteScoutWebApiExample", "ByteScoutWebApiExample.vbproj", "{9B91124C-66C3-4BD9-B29E-168C1ABB15AC}"
EndProject
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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')" />
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
    <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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    <DebugSymbols>true</DebugSymbols>
    <DebugType>full</DebugType>
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    <DocumentationFile>ByteScoutWebApiExample.xml</DocumentationFile>
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  <PropertyGroup>
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  <ItemGroup>
    <Reference Include="Newtonsoft.Json, Version=10.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
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    <Reference Include="System.Data" />
    <Reference Include="System.Deployment" />
    <Reference Include="System.Xml" />
    <Reference Include="System.Core" />
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    <Import Include="Microsoft.VisualBasic" />
    <Import Include="System" />
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    <Content Include="image1.png">
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    <Content Include="image2.jpg">
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Module1.vb

      
Imports System.IO
Imports System.Net
Imports Newtonsoft.Json
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 image files
	Dim ImageFiles() As String = New String() {".\image1.png", ".\image2.jpg"}
	' 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 imageFile As String In ImageFiles

				' 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(imageFile)))

				' 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", imageFile) ' You can use UploadData() instead if your file is byte[] or Stream

					uploadedFiles.Add(uploadedFileUrl)
				Else
					Console.WriteLine(json("message").ToString())
				End If

			Next

			If uploadedFiles.Count > 0 Then

				' Set JSON content type
				webClient.Headers.Add("Content-Type", "application/json")

				' 2. CREATE PDF DOCUMENT FROM UPLOADED IMAGE FILES

				' Prepare URL for `Image To PDF` API call
				Dim url As String = "https://api.pdf.co/v1/pdf/convert/from/image"

				' Prepare requests params as JSON
				' See documentation: https : //apidocs.pdf.co
				Dim parameters As New Dictionary(Of String, Object)
				parameters.Add("name", Path.GetFileName(DestinationFile))
				parameters.Add("url", String.Join(",", uploadedFiles))

				' Convert dictionary of params to JSON
				Dim jsonPayload As String = JsonConvert.SerializeObject(parameters)

				' Execute POST request with JSON payload
				Dim response As String = webClient.UploadString(url, jsonPayload)

				' 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

    

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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