PDF.co Web API - PDF To Image API - VB.NET - Convert PDF To JPEG From Uploaded File - ByteScout

PDF.co Web API – PDF To Image API – VB.NET – Convert PDF To JPEG From Uploaded File

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PDF.co Web API – PDF To Image API – VB.NET – Convert PDF To JPEG From Uploaded File

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 file
const SourceFile as String = “.\sample.pdf”
‘ Comma-separated list of page indices (or ranges) to process. Leave empty for all pages. Example: ‘0,2-5,7-‘.
const Pages as String = “”
‘ PDF document password. Leave empty for unprotected documents.
const Password as String = “”

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. RETRIEVE THE PRESIGNED URL TO UPLOAD THE FILE.
‘ * If you already have the direct file URL, skip to the step 3.

‘ 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(SourceFile)))

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

‘ 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()

‘ 2. UPLOAD THE FILE TO CLOUD.

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

‘ 3. CONVERT UPLOADED PDF FILE TO JPEG

‘ Prepare URL for `PDF To JPEG` API call
query = Uri.EscapeUriString(String.Format(
“https://api.pdf.co/v1/pdf/convert/to/jpg?password={0}&pages={1}&url={2}”,
Password,
Pages,
uploadedFileUrl))

‘ Execute request
response = webClient.DownloadString(query)

‘ Parse JSON response
json = JObject.Parse(response)

If json(“error”).ToObject(Of Boolean) = False Then

‘ Download generated JPEG files
Dim page As Integer = 1
For Each token As JToken In json(“urls”)

Dim resultFileUrl As string = token.ToString()
Dim localFileName As String = String.Format(“.\page{0}.jpg”, page)

webClient.DownloadFile(resultFileUrl, localFileName)

Console.WriteLine(“Downloaded “”{0}””.”, localFileName)
page = page + 1

Next

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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