Declare Function EnumDisplaySettings Lib "user32" _ Alias "EnumDisplaySettingsA" _ (ByVal lpszDeviceName As Long, _ ByVal iModeNum As Long, _ lpDevMode As Any) As Boolean Declare Function ChangeDisplaySettings Lib "user32" _ Alias "ChangeDisplaySettingsA" _ (lpDevMode As Any, ByVal dwFlags As Long) As LongDeclare Function ExitWindowsEx Lib "user32" _ (ByVal uFlags As Long, ByVal dwReserved As Long) As Long Public Const EWX_LOGOFF = 0 Public Const EWX_SHUTDOWN = 1 Public Const EWX_REBOOT = 2 Public Const EWX_FORCE = 4 Public Const CCDEVICENAME = 32 Public Const CCFORMNAME = 32 Public Const DM_BITSPERPEL = &H40000 Public Const DM_PELSWIDTH = &H80000 Public Const DM_PELSHEIGHT = &H100000 Public Const CDS_UPDATEREGISTRY = &H1 Public Const CDS_TEST = &H4 Public Const DISP_CHANGE_SUCCESSFUL = 0 Public Const DISP_CHANGE_RESTART = 1 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 ExampleChanges the resolution to 640x480 with the current colordepth.Dim DevM As DEVMODE 'Get the info into DevM erg& = EnumDisplaySettings(0&, 0&, DevM) 'We don't change the colordepth, because a 'rebot will be necessaryDevM.dmFields = DM_PELSWIDTH Or DM_PELSHEIGHT 'Or DM_BITSPERPEL DevM.dmPelsWidth = 640 'ScreenWidth DevM.dmPelsHeight = 480 'ScreenHeight 'DevM.dmBitsPerPel = 32 (could be 8, 16, 32 or even 4)'Now change the display and check if possible erg& = ChangeDisplaySettings(DevM, CDS_TEST)'Check if succesfull Select Case erg& Case DISP_CHANGE_RESTART an = MsgBox("You've to reboot", vbYesNo + vbSystemModal, "Info") If an = vbYes Then erg& = ExitWindowsEx(EWX_REBOOT, 0&) End If Case DISP_CHANGE_SUCCESSFUL erg& = ChangeDisplaySettings(DevM, CDS_UPDATEREGISTRY) MsgBox "Everything's ok", vbOKOnly + vbSystemModal, "It worked!" Case Else MsgBox "Mode not supported", vbOKOnly + vbSystemModal, "Error" End Select End Sub
Alias "EnumDisplaySettingsA" _
(ByVal lpszDeviceName As Long, _
ByVal iModeNum As Long, _
lpDevMode As Any) As Boolean Declare Function ChangeDisplaySettings Lib "user32" _
Alias "ChangeDisplaySettingsA" _
(lpDevMode As Any, ByVal dwFlags As Long) As LongDeclare Function ExitWindowsEx Lib "user32" _
(ByVal uFlags As Long, ByVal dwReserved As Long) As Long Public Const EWX_LOGOFF = 0
Public Const EWX_SHUTDOWN = 1
Public Const EWX_REBOOT = 2
Public Const EWX_FORCE = 4
Public Const CCDEVICENAME = 32
Public Const CCFORMNAME = 32
Public Const DM_BITSPERPEL = &H40000
Public Const DM_PELSWIDTH = &H80000
Public Const DM_PELSHEIGHT = &H100000
Public Const CDS_UPDATEREGISTRY = &H1
Public Const CDS_TEST = &H4
Public Const DISP_CHANGE_SUCCESSFUL = 0
Public Const DISP_CHANGE_RESTART = 1 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 ExampleChanges the resolution to 640x480 with the current colordepth.Dim DevM As DEVMODE
'Get the info into DevM
erg& = EnumDisplaySettings(0&, 0&, DevM)
'We don't change the colordepth, because a
'rebot will be necessaryDevM.dmFields = DM_PELSWIDTH Or DM_PELSHEIGHT 'Or DM_BITSPERPEL
DevM.dmPelsWidth = 640 'ScreenWidth
DevM.dmPelsHeight = 480 'ScreenHeight
'DevM.dmBitsPerPel = 32 (could be 8, 16, 32 or even 4)'Now change the display and check if possible erg& = ChangeDisplaySettings(DevM, CDS_TEST)'Check if succesfull Select Case erg&
Case DISP_CHANGE_RESTART
an = MsgBox("You've to reboot", vbYesNo + vbSystemModal, "Info")
If an = vbYes Then
erg& = ExitWindowsEx(EWX_REBOOT, 0&)
End If
Case DISP_CHANGE_SUCCESSFUL
erg& = ChangeDisplaySettings(DevM, CDS_UPDATEREGISTRY)
MsgBox "Everything's ok", vbOKOnly + vbSystemModal, "It worked!"
Case Else
MsgBox "Mode not supported", vbOKOnly + vbSystemModal, "Error"
End Select End Sub
width=Screen.Width / Screen.TwipsPerPixelX
height=Screen.Height / Screen.TwipsPerPixeLY
然后用timer控件定时判断!
Private Sub Form_Paint()
width=Screen.Width / Screen.TwipsPerPixelX
height=Screen.Height / Screen.TwipsPerPixeLY
End Sub