Cambio di risoluzione vb6

[PEA]

Ho bisogno di mostrare un immagine da 640x480 a pieno schermo, devo cambiare la risuoluzione. Come faccio??? il mio programma deve cambiare la risoluzione, mostrare l'immagine, quando l'utente preme un qualsiasi tasto tornare alla risoluzione precedente e mostrare un altro form. aiuto!!!!

[xegallo]

non ti conviene mettere l'immagine su una image grande quanto lo schermo?

[PEA]

No, ho proprio bisogno di cambiare la risoluzione, sto cercando di simulare un errore di windows e questo cambia la risoluzione quando mostra lo schermo blu!

[VisualBasico]

ecco qui il codice che potrebbe servirti...ma attenzione quando torni alla risoluzione originale tutte le icone rimangono mal disposte!!!

Option Explicit
Const WM_DISPLAYCHANGE = &H7E
Const HWND_BROADCAST = &HFFFF&
Const EWX_LOGOFF = 0
Const EWX_SHUTDOWN = 1
Const EWX_REBOOT = 2
Const EWX_FORCE = 4
Const CCDEVICENAME = 32
Const CCFORMNAME = 32
Const DM_BITSPERPEL = &H40000
Const DM_PELSWIDTH = &H80000
Const DM_PELSHEIGHT = &H100000
Const CDS_UPDATEREGISTRY = &H1
Const CDS_TEST = &H4
Const DISP_CHANGE_SUCCESSFUL = 0
Const DISP_CHANGE_RESTART = 1
Const BITSPIXEL = 12
Private Type DEVMODE
    dmDeviceName As String * CCDEVICENAME
    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 * CCFORMNAME
    dmUnusedPadding As Integer
    dmBitsPerPel As Integer
    dmPelsWidth As Long
    dmPelsHeight As Long
    dmDisplayFlags As Long
    dmDisplayFrequency As Long
End Type
Private Declare Function EnumDisplaySettings Lib "user32" Alias "EnumDisplaySettingsA" (ByVal lpszDeviceName As Long, ByVal iModeNum As Long, lpDevMode As Any) As Boolean
Private Declare Function ChangeDisplaySettings Lib "user32" Alias "ChangeDisplaySettingsA" (lpDevMode As Any, ByVal dwFlags As Long) As Long
Private Declare Function ExitWindowsEx Lib "user32" (ByVal uFlags As Long, ByVal dwReserved As Long) As Long
Private Declare Function GetDeviceCaps Lib "gdi32" (ByVal hdc As Long, ByVal nIndex As Long) As Long
Private Declare Function CreateDC Lib "gdi32" Alias "CreateDCA" (ByVal lpDriverName As String, ByVal lpDeviceName As String, ByVal lpOutput As String, ByVal lpInitData As Any) As Long
Private Declare Function DeleteDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Dim OldX As Long, OldY As Long, nDC As Long
Sub ChangeRes(X As Long, Y As Long, Bits As Long)
    Dim DevM As DEVMODE, ScInfo As Long, erg As Long, an As VbMsgBoxResult
    erg = EnumDisplaySettings(0&, 0&, DevM)
    DevM.dmFields = DM_PELSWIDTH Or DM_PELSHEIGHT Or DM_BITSPERPEL
    DevM.dmPelsWidth = X
    DevM.dmPelsHeight = Y
    DevM.dmBitsPerPel = Bits
    erg = ChangeDisplaySettings(DevM, CDS_TEST)
    Select Case erg&
        Case DISP_CHANGE_RESTART
            an = MsgBox("Riavviare il sistema?", vbYesNo + vbSystemModal, "Attenzione")
            If an = vbYes Then
                erg& = ExitWindowsEx(EWX_REBOOT, 0&)
            End If
        Case DISP_CHANGE_SUCCESSFUL
            erg = ChangeDisplaySettings(DevM, CDS_UPDATEREGISTRY)
            ScInfo = Y * 2 ^ 16 + X
            SendMessage HWND_BROADCAST, WM_DISPLAYCHANGE, ByVal Bits, ByVal ScInfo
        Case Else
            MsgBox "Modalità non supportata", vbOKOnly + vbSystemModal, "Errore"
    End Select
End Sub
Private Sub Form_Load()
    Dim nDC As Long
    OldX = Screen.Width / Screen.TwipsPerPixelX
    OldY = Screen.Height / Screen.TwipsPerPixelY
    nDC = CreateDC("DISPLAY", vbNullString, vbNullString, ByVal 0&)
    ChangeRes 800, 600, GetDeviceCaps(nDC, BITSPIXEL)
End Sub
Private Sub Form_Unload(Cancel As Integer)
    ChangeRes OldX, OldY, GetDeviceCaps(nDC, BITSPIXEL)
    DeleteDC nDC
End Sub

ciao ciao...