ScreenChange.bas

 Attribute VB_Name = "ScreenChange"
Option Explicit
Declare Function GetDeviceCaps Lib "gdi32" (ByVal hDC As Long, ByVal nIndex As Long) As Long
Declare Function GetDesktopWindow Lib "user32" () As Long
Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Declare Function ReleaseDC Lib "user32" (ByVal hwnd As Long, ByVal hDC As Long) As Long
Public Const HORZRES = 8
Public Const VERTRES = 10
Public Const BITSPIXEL = 12

Public Const DM_BITSPERPEL = &H40000
Public Const DM_PELSWIDTH = &H80000
Public Const DM_PELSHEIGHT = &H100000
Public Const CCHDEVICENAME = 32
Public Const CCHFORMNAME = 32
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
Declare Function ChangeDisplaySettings Lib "user32.dll" Alias "ChangeDisplaySettingsA" (lpDevMode As DEVMODE, ByVal dwFalgs As Long) As Long
Public Sub SetVideoMode(Width As Long, Height As Long, Depth As Long)
    Dim dm As DEVMODE
    dm.dmPelsWidth = Width
    dm.dmPelsHeight = Height
    dm.dmBitsPerPel = Depth
    dm.dmSize = Len(dm)
    dm.dmFields = DM_PELSWIDTH + DM_PELSHEIGHT + DM_BITSPERPEL
    ChangeDisplaySettings dm, 0
End Sub
Public Sub GetVideoMode(ByRef Width As Long, ByRef Height As Long, ByRef Depth As Long)
    Dim hDC As Long
    hDC = GetDC(GetDesktopWindow())
    Width = GetDeviceCaps(hDC, HORZRES)
    Height = GetDeviceCaps(hDC, VERTRES)
    Depth = GetDeviceCaps(hDC, BITSPIXEL)
    ReleaseDC GetDesktopWindow(), hDC
End Sub



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