How to turn on/ wake the screen with Visual Basic

Question

I am struggling with this code for turning on the monitor. I have set in the Windows 10 control panel the display to turn off after 10 minutes, but I have one voice recognizing app written in VB and I need to wake the screen when I call the application via voice. So is there a code for waking the monitor trough Visual Basic? I searched a long time but I only find some Java code. Thanks and have a great day/night! :)

Answer 1

K, so, with the guidance of the article on codeproject, some of the answers given to this question and pinvoke.net, I've got something working. It could be cleaner, but I leave that up to you :). it is your project, after all ;).

Imports System.Runtime.InteropServices

Public Class Monitor
    Private Const WM_SYSCOMMAND As Integer = &H112
    Private Const SC_MONITORPOWER As Integer = &HF170
    Private Const HWND_BROADCAST As Integer = &HFFFF
    Private Const INPUT_MOUSE As Integer = 0
    Private Const MOUSEEVENTF_MOVE As Integer = 1

    <DllImport("user32.dll", SetLastError:=True, CharSet:=CharSet.Auto)> _
    Private Shared Function SendMessage(ByVal hWnd As IntPtr, ByVal Msg As UInteger, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As IntPtr
    End Function

    <DllImport("user32.dll", SetLastError:=True)>
    Private Shared Function SendInput(<[In]()> ByVal nInput As UInt32,<[In](), MarshalAs(UnmanagedType.LPArray, ArraySubtype:=UnmanagedType.Struct, SizeParamindex:=0)> ByVal pInputs() As INPUT, <[In]()> ByVal cbInput As Int32) As UInt32
    End Function

    Private Structure INPUT
        Public type As Integer
        Public dx As Integer
        Public dy As Integer
        Public mouseData As Integer
        Public dwFlags As Integer
        Public time As Integer
        Public dwExtraInfo As IntPtr
    End Structure


    Public Shared Sub Disable()
         SendMessage(New IntPtr(HWND_BROADCAST), WM_SYSCOMMAND, SC_MONITORPOWER, New IntPtr(2))
    End Sub

    Public Shared Sub Enable()
        Dim input = New INPUT()

        input.type = INPUT_MOUSE
        input.dx = 1
        input.dy = 0
        input.mouseData = 0
        input.dwFlags = MOUSEEVENTF_MOVE
        input.time = 0
        input.dwExtraInfo = IntPtr.Zero

        SendInput(1, {input}, 28)
    End Sub
End Class