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english:
Change the windows resolution in VB
Declarations:

کد:
Private Const CCDEVICENAME = 32

Private Const CCFORMNAME = 32

Private Const DM_PELSWIDTH = &H80000

Private Const DM_PELSHEIGHT = &H100000Private 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 LongPrivate 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

code:

کد:
'this function below will change the resolution

Private Sub ChangeRes(iWidth As Single, iHeight As Single)

    Dim blnWorked As Boolean

    Dim i As Long

    Dim DevM As DEVMODE

    i = 0

    Do

        blnWorked = EnumDisplaySettings(0&, i, DevM)

        i = i + 1

    Loop Until (blnWorked = False)

    With DevM

        .dmFields = DM_PELSWIDTH Or DM_PELSHEIGHT

        .dmPelsWidth = iWidth

        .dmPelsHeight = iHeight

    End With

    Call ChangeDisplaySettings(DevM, 0)

End Sub

Amin_Mansouri