Attribute VB_Name = "Resolution"
Option Explicit

'Pour passer par exemple à une résolution de 800 x 600 :
'ResolutionEcran 800, 600





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 Const CCHDEVICENAME = 32
Private Const CCHFORMNAME = 32
Private Const DM_WIDTH = &H80000
Private Const DM_HEIGHT = &H100000

Private Type DEVMODE
    dmDeviceName As String * CCHDEVICENAME
    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 * CCHFORMNAME
    dmUnusedPadding As Integer
    dmBitsPerPel As Integer
    dmPelsWidth As Long
    dmPelsHeight As Long
    dmDisplayFlags As Long
    dmDisplayFrequency As Long
End Type

Public Sub ResolutionEcran(sgWidth As Long, sgHeight As Long)

Dim blTMP As Boolean, lgTMP As Long, dmEcran As DEVMODE, res As Long

lgTMP = 0
Do
    blTMP = EnumDisplaySettings(0, lgTMP, dmEcran)
    lgTMP = lgTMP + 1
Loop While blTMP <> 0

dmEcran.dmFields = DM_WIDTH Or DM_HEIGHT
dmEcran.dmPelsWidth = sgWidth
dmEcran.dmPelsHeight = sgHeight
lgTMP = ChangeDisplaySettings(dmEcran, 0)

End Sub