Option Explicit
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
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 ENUM_CURRENT_SETTINGS = &HFFFF - 1
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
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Private Sub ScreenResolution()
Dim x As Long, y As Long
Dim Index As Integer, MsgStr As String
MsgStr = vbLf & "Please the index for the screen resolution "
MsgStr = MsgStr & vbLf & "that you would like to change to:"
MsgStr = MsgStr & vbLf & vbLf
MsgStr = MsgStr & "0 = 800 x 600" & vbLf
MsgStr = MsgStr & "1 = 1024 x 768" & vbLf
MsgStr = MsgStr & "2 = 1152 x 864" & vbLf
MsgStr = MsgStr & "3 = 1280 x 1024" & vbLf
MsgStr = MsgStr & "4 = 1600 x 1200" & vbLf
On Error Resume Next
Index = InputBox(MsgStr, "Change Screen Resolution")
Select Case Index
Case 0: x = 800: y = 600
Case 1: x = 1024: y = 768
Case 2: x = 1152: y = 864
Case 3: x = 1280: y = 1024
Case 4: x = 1600: y = 1200
End Select
Call SetScreen(x, y)
End Sub
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Private Sub SetScreen(ByVal x&, ByVal y&)
Dim Result&
Dim Dev As DEVMODE
Call EnumDisplaySettings(0&, ENUM_CURRENT_SETTINGS, Dev)
Dev.dmDisplayFrequency = 90
Dev.dmFields = DM_PELSWIDTH Or DM_PELSHEIGHT
Dev.dmPelsWidth = x
Dev.dmPelsHeight = y
Result = ChangeDisplaySettings(Dev, CDS_TEST)
ChangeDisplaySettings Dev, CDS_UPDATEREGISTRY
End Sub