How to add text and images to PDF in VB.NET with PDF.co Web API
What is PDF.co Web API? It is the flexible Web API that includes full set of functions from e-signature requests to data extraction, OCR, images recognition, pdf splitting and pdf splitting. Can also generate barcodes and read barcodes from images, scans and pdf.
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AddImageByFindingTargetCoordinates.sln
Microsoft Visual Studio Solution File, Format Version 12.00
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AddImageByFindingTargetCoordinates.vbproj
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<OutputType>Exe</OutputType>
<StartupObject>AddImageByFindingTargetCoordinates.Module1</StartupObject>
<RootNamespace>AddImageByFindingTargetCoordinates</RootNamespace>
<AssemblyName>AddImageByFindingTargetCoordinates</AssemblyName>
<FileAlignment>512</FileAlignment>
<MyType>Console</MyType>
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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 = "***********************************"
' Direct URL of source PDF file.
' You can also upload your own file into PDF.co and use it as url. Check "Upload File" samples for code snippets: https://github.com/bytescout/pdf-co-api-samples/tree/master/File%20Upload/
Const SourceFileUrl As String = "https://bytescout-com.s3.amazonaws.com/files/demo-files/cloud-api/pdf-edit/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 = ""
' Destination PDF file name
Const DestinationFile As String = ".\result.pdf"
' Image params
Private Const Type1 As String = "image"
Private Const Width1 As Int32 = 119
Private Const Height1 As Int32 = 32
Private Const ImageUrl As String = "https://bytescout-com.s3.amazonaws.com/files/demo-files/cloud-api/pdf-edit/logo.png"
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)
' Set JSON content type
webClient.Headers.Add("Content-Type", "application/json")
' Find Text coordinates to add image
Dim oCoordinates = FindCoordinates(API_KEY, SourceFileUrl, "Your Company Name")
Dim X1 As Int32 = 450
Dim Y1 As Int32 = oCoordinates.y
' * Add image *
' Prepare URL for `PDF Edit` API call
Dim url As String = "https://api.pdf.co/v1/pdf/edit/add"
' Prepare requests params as JSON
' See documentation: https://apidocs.pdf.co/04-pdf-add-text-signatures-and-images-to-pdf
Dim jsonPayload As String = {code}quot;{{
""name"": ""{Path.GetFileName(DestinationFile)}"",
""url"": ""{SourceFileUrl}"",
""password"": ""{Password}"",
""images"": [
{{
""url"": ""{ImageUrl}"",
""x"": {X1},
""y"": {Y1},
""width"": {Width1},
""height"": {Height1},
""pages"": ""{Pages}""
}}
]
}}"
Try
' 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
Catch ex As WebException
Console.WriteLine(ex.ToString())
End Try
webClient.Dispose()
Console.WriteLine()
Console.WriteLine("Press any key...")
Console.ReadKey()
End Sub
''' <summary>
''' Find result coordinates
''' </summary>
Function FindCoordinates(ByVal API_KEY As String, ByVal SourceFileUrl As String, ByVal SearchString As String) As ResultCoOrdinates
Dim oResult As New ResultCoOrdinates()
' Create standard .NET web client instance
Dim webClient As WebClient = New WebClient()
' Set API Key
webClient.Headers.Add("x-api-key", API_KEY)
' Set JSON content type
webClient.Headers.Add("Content-Type", "application/json")
' Prepare URL for PDF text search API call.
' See documentation: https://apidocs.pdf.co/07-pdf-search-text
Dim url As String = "https://api.pdf.co/v1/pdf/find"
' Prepare requests params as JSON
' See documentation: https : //apidocs.pdf.co
Dim parameters As New Dictionary(Of String, Object)
parameters.Add("url", SourceFileUrl)
parameters.Add("searchString", SearchString)
' Convert dictionary of params to JSON
Dim jsonPayload As String = JsonConvert.SerializeObject(parameters)
Try
' 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
Dim item = json("body")(0)
oResult.x = item("left")
oResult.y = item("top")
oResult.width = item("width")
oResult.height = item("height")
End If
Catch ex As WebException
Console.WriteLine(ex.ToString())
End Try
webClient.Dispose()
Return oResult
End Function
Class ResultCoOrdinates
Public x As Integer
Public y As Integer
Public width As Integer
Public height As Integer
End Class
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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printable version:
PDF-co-Web-API-VB-NET-Add-Image-by-finding-target-coordinates.pdf
PDF-co-Web-API-VB-NET-Add-Image-by-finding-target-coordinates.pdf
