Visual Basic

Option Explicit

Private Const PM_REMOVE = &H1

Private Type POINTAPI
    X As Long
    Y As Long
End Type

Private Type Msg
    hWnd As Long
    Message As Long
    wParam As Long
    lParam As Long
    time As Long
    pt As POINTAPI
End Type

Private Declare Function PeekMessage Lib "user32" Alias "PeekMessageA" (lpMsg As Msg, ByVal hWnd As Long, ByVal wMsgFilterMin As Long, ByVal wMsgFilterMax As Long, ByVal wRemoveMsg As Long) As Long
Private Declare Function WaitMessage Lib "user32" () As Long
Private bCancel As Boolean
Private Const WM_MOUSEWHEEL = 522
'**************************************
Private Sub ProcessMessages()

Dim Message As Msg

Do While Not bCancel
    WaitMessage
    If PeekMessage(Message, Me.hWnd, WM_MOUSEWHEEL, WM_MOUSEWHEEL, PM_REMOVE) Then
        If Message.wParam < 0 Then 
            Picture1.Top = Picture1.Top + 240
        Else
            Picture1.Top = Picture1.Top - 240
        End If
    End If
    DoEvents
Loop

End Sub
'**************************************
Private Sub Form_Load()

Picture1.AutoRedraw = True
Picture1.Print "Please use  mouse wheel To move this Picture."
Me.Show
ProcessMessages

End Sub
Private Sub Form_Unload(Cancel As Integer)

bCancel = True

End Sub

Dim rs As New RS232.Rs232<br />
 rs.Port.ToString("Softv92faxmodem")<br />
 rs.Open()

Imports System.Runtime.InteropServices

Public Class Form1
    Private Const BM_GETCHECK As Long = &HF0
    Private Const BM_SETCHECK As Long = &HF1
    Private Const BS_AUTOCHECKBOX As Long = &H3
    Private Const BST_CHECKED As Long = 1
    Private Const BST_UNCHECKED As Long = 0



    <DllImport("user32.dll")> _
    Private Shared Function SendMessage(ByVal hWnd As IntPtr, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    End Function


    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim CheckBox As Control
        CheckBox = CheckBox1
        Dim value As IntPtr

        value = CheckBox.Handle

        SendMessage(value, BM_SETCHECK, BST_CHECKED, 0)

    End Sub
End Class