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Hello World VBNet - SDK sample

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Feb 25, 2019

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Sample how to print a *"Hello World"* pdf file from VB.NET using novaPDF Printer.
Hello World VBNet sample is a simple Windows console application that prints one page with the *"novaPDF says Hello World from VB.Net"* text to the novaPDF Printer. It demonstrates the basic use of the INovaPDFOptions interface with this type of code.
To be able to use the samples you must install novaPDF SDK as samples work only with it. Download it here: nova PDF SDK.

The printing job is made using the package System.Drawing.Printing. Basically the sample determines the active profile, makes a copy of it into a profile called *"Test VBNet"*, sets the new profile as active, sets the subject of the generated PDF document, prints a page, and restores original printer settings. The location of the generated document depends on whatever the settings are for the current active profile.
Because of the specific exception based error handling in .NET, all calls to methods in the INovaPDFOptions interface must be nested within a try–catch block. Consider for example that we want to add a profile called "test", but the profile "test" already exists. Then the call pNova.AddProfile("test") will throw an System.Runtime.InteropServices.COMException with the ErrorCode property set to NV_PROFILE_EXISTS (0xD5DA0006).

Source Code
Imports System
Imports System.Drawing
Imports System.Drawing.Printing
Imports System.Windows.Forms
' the novapiLib package must be added as a    COM    refference
Imports novapiLib80

Module Module1
	'    <summary>
	'    The    main entry point for the application.
	'    </summary>
	Const PRINTER_NAME As String = "novaPDF SDK 8"

	Const PROFILE_NAME As String = "Test VBNet"
	Const PROFILE_IS_PUBLIC As Integer = 0
	Const NOVAPDF_INFO_SUBJECT As String = "Document Subject"

	Const NV_PROFILE_EXISTS As Long = -707133434

	Sub Main()
			' create the NovaPdfOptions object
			Dim pNova As NovaPdfOptions80
			pNova = New NovaPdfOptions80
			' initialize the NovaPdfOptions object
			' if you have an application license for novaPDF SDK, 
			' mark start changing options
			' get the active profile ...
			Dim activeProfile As String = ""
			Dim nActivePublic As Integer = 0
			Catch ex As System.Runtime.InteropServices.COMException
				' ignore profile exists error
				If (NovaErrors.NV_NO_ACTIVE_PROFILE = ex.ErrorCode) Then
					System.Console.WriteLine("The printer does not have an active profile")
					'more  serious error, propagate it
					Throw ex
				End If
			End Try

			Dim newProfileID As String = ""
				' and make    a copy of it
				pNova.AddProfile(PROFILE_NAME, PROFILE_IS_PUBLIC, newProfileID)
			Catch e As System.Runtime.InteropServices.COMException
				' ignore profile exists error
				If (NV_PROFILE_EXISTS = e.ErrorCode) Then
					System.Console.WriteLine("Profile already exists")
					' more    serious    error, propagate it
					Throw e
				End If
			End Try

			'load the new profile

			' and set some options
			' uncomment the function calls for the options you wish to set
			' change the options in the nova.cs unit

			'save the new added profile
			' set the copy    profile    as active profile ...

		' print a test    page, using    the    previously set active profile settings
		Dim pd As PrintDocument = New PrintDocument
		pd.PrinterSettings.PrinterName = PRINTER_NAME
		AddHandler pd.PrintPage, AddressOf PrintPageFunction
			If ((activeProfile.Length > 0) And (activeProfile.CompareTo(PROFILE_NAME) <> 0)) Then
			End If
		Catch e As System.Runtime.InteropServices.COMException
		Catch e As Exception
		End Try
	End Sub

	' and finally the function that actually prints the page
	Private Sub PrintPageFunction(ByVal sender As Object, ByVal ev As PrintPageEventArgs)
		Dim str As String = "novaPDF says Hello World from VB.Net"
		Dim font As Font = New Font("Arial", 16)
		Dim brush As Brush = New SolidBrush(Color.Black)
		ev.Graphics.DrawString(str, font, brush, 20.0!, 20.0!)
		ev.HasMorePages = False
	End Sub

End Module