Key simulation without pressing keys

Hello,

As a part of my project, I need to print Active application in Vb.net. For example, if web browser is currently active Application then it should print that web page. It can be done by simulating Key Press (Ctrl + P without actually pressing it) or using Print library. This application is triggered by Shortcut using AutoHotKey, So this process runs in background. Here is code..

 Public Class Class1

    Public Shared Sub Main()
        Dim filePath As String = "C:\Users\AG\Desktop\SCaptur.png"

        CMD.ToPDFCreator()
        CMD.PrintDocument()
        CMD.ChangeBack()

    End Sub

End Class

Public NotInheritable Class CMD

#Region " Methods "

    Public Shared Function ToPDFCreator()
        Dim p As Process = New Process()
        Dim pi As ProcessStartInfo = New ProcessStartInfo()
        pi.Arguments = " " + "/C" + " " + "RUNDLL32 PRINTUI.DLL,PrintUIEntry /y /n" + " " + "PDFCreator"
        pi.FileName = "cmd.exe"
        p.StartInfo = pi
        p.Start()
    End Function

    Public Shared Function PrintDocument()
        System.Windows.Forms.SendKeys.Send("^P")
    End Function

    Public Shared Function ChangeBack()
        Dim p As Process = New Process()
        Dim pi As ProcessStartInfo = New ProcessStartInfo()
        pi.Arguments = " " + "/C" + " " + "RUNDLL32 PRINTUI.DLL,PrintUIEntry /y /n" + " " + """" + "HP DeskJet" + """"
        pi.FileName = "cmd.exe"
        p.StartInfo = pi
        p.Start()
    End Function

#End Region

End Class

This code show error:
SendKeys cannot run inside this application because the application is not handling Windows messages. Either change the application to handle messages, or use the SendKeys.SendWait method.

Can any one tell me, How to resolve this issue?
Is there any other method to print active application?

Tags: Visual Basic