Returning to old screen resolution

[webcrab]

Hi!
Few days ago I wanted to change computer resolution to the resolution My form was builded so I was directed to a thread here that was talkin about the same thing.
I managed to change screen resolution At the Application entrance. Now I want to return to the old computer resolution in on close event -meaning: on app exit.
I used the GetScreenResolution() to detect the screen resolution and than I used changeResolution (Width,Height) Function to change the resolution to the new RES. Now I need to call ChangeResolution again inorder to return to the old RES but when i'm call it again and trying to pass the old values to the function it doesn't recognize the variables that save the values in GetscreenResolution()

what Shell I Do?

Here is the code:

'*****************************************************************
' DECLARATIONS SECTION
'*****************************************************************
Option Explicit
Public Type RECT
   x1 As Long
   y1 As Long
   x2 As Long
   y2 As Long
   MyWidth As Long
   MyHeight As Long
End Type
' NOTE: The following declare statements are case sensitive.
Declare Function GetDesktopWindow Lib "User32" () As Long
Declare Function GetWindowRect Lib "User32" _
      (ByVal hWnd As Long, rectangle As RECT) As Long
Public Type DEVMODE
    dmDeviceName As String * 32
    dmSpecVersion As Integer
    dmDriverVersion As Integer
    dmSize As Integer
    dmDriverExtra As Integer
    dmFields As Long
    dmOrientation As Integer
    dmPaperSize As Integer
    dmPaperLength As Integer
    dmPaperWidth As Integer
    dmScale As Integer
    dmCopies As Integer
    dmDefaultSource As Integer
    dmPrintQuality As Integer
    dmColor As Integer
    dmDuplex As Integer
    dmYResolution As Integer
    dmTTOption As Integer
    dmCollate As Integer
    dmFormName As String * 32
    dmUnusedPadding As Integer
    dmBitsPerPixel As Integer
    dmPelsWidth As Long
    dmPelsHeight As Long
    dmDisplayFlags As Long
    dmDisplayFrequency As Long
    dmICMMethod As Long
    dmICMIntent As Long
    dmMediaType As Long
    dmDitherType As Long
    dmReserved1 As Long
    dmReserved2 As Long
    
     
Rem    dmPanningWidth As Long 'remove the Rem if your OS is Windows 2000, if needed
Rem    dmPanningHeight As Long 'remove the Rem if your OS is Windows 2000, if needed
End Type
Public Declare Function EnumDisplaySettings Lib "user32.dll" Alias "EnumDisplaySettingsA" (ByVal lpszDeviceName As String, ByVal iModeNum As Long, lpDevMode As DEVMODE) As Long
Public Const ENUM_CURRENT_SETTINGS = -1
Public Declare Function ChangeDisplaySettings Lib "user32.dll" Alias "ChangeDisplaySettingsA" (lpDevMode As Any, ByVal dwFlags As Long) As Long
Public Const CDS_UPDATEREGISTRY = &H1
Public Const CDS_TEST = &H2
Public Const DISP_CHANGE_SUCCESSFUL = 0
Public Const DISP_CHANGE_RESTART = 1
 
   
   
'*****************************************************************
' FUNCTION: GetScreenResolution()
'
' PURPOSE:
'   To determine the current screen size or resolution.
'
' RETURN:
'   The current screen resolution. Typically one of the following:
'      640 x 480
'      800 x 600
'     1024 x 768
'
'*****************************************************************
 
Function GetScreenResolution() As String
   Dim R As RECT
   Dim hWnd As Long
   Dim RetVal As Long
   
   
   hWnd = GetDesktopWindow()
   RetVal = GetWindowRect(hWnd, R)
   R.MyWidth = R.x2 - R.x1
   R.MyHeight = R.y2 - R.y1
   GetScreenResolution = R.MyWidth & "x" & R.MyHeight
   
   
End Function
Public Function ChangeResolution(vWidth As Variant, vHeight As Variant)
On Error GoTo Err_ChangeResolution
    Dim dm As DEVMODE
    Dim RetVal As Long
    
    dm.dmSize = Len(dm)
    RetVal = EnumDisplaySettings(vbNullString, ENUM_CURRENT_SETTINGS, dm)
    dm.dmPelsWidth = vWidth  ' Width must be numeric (e.g. 1024 or 800 or 640)
    dm.dmPelsHeight = vHeight ' Height must be numeric (e.g. 768 or 600 or 480)
    RetVal = ChangeDisplaySettings(dm, CDS_TEST)
    If RetVal <> DISP_CHANGE_SUCCESSFUL Then
        Debug.Print "Unable to change to the requested resolution of " & vWidth & "x" & vHeight
    Else
        RetVal = ChangeDisplaySettings(dm, CDS_UPDATEREGISTRY)
        Select Case RetVal
        Case DISP_CHANGE_SUCCESSFUL
            Debug.Print "Resolution successfully changed to " & vWidth & "x" & vHeight
        Case DISP_CHANGE_RESTART
            Debug.Print "A reboot is necessary before the resolution changes will take effect."
        Case Else
            Debug.Print "Unable to change resolution!"
        End Select
    End If
Exit_ChangeResolution:
    Exit Function
Err_ChangeResolution:
    MsgBox Err.Number, Err.Description
    Resume Exit_ChangeResolution
End Function