Option Explicit
Private Const CCHDEVICENAME As Long = 32
Private Const CCHFORMNAME As Long = 32
Private Const CDS_TEST As Long = &H2
Private Const DM_DISPLAYFREQUENCY As Long = &H400000
Private Const DM_BITSPERPEL As Long = &H40000
Private Const DM_PELSHEIGHT As Long = &H100000
Private Const DM_PELSWIDTH As Long = &H80000
Private Const ENUM_CURRENT_SETTINGS As Long = (-1)
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
Private Declare Function ChangeDisplaySettings Lib "user32.dll" Alias "ChangeDisplaySettingsA" (ByRef lpDevMode As DEVMODE, ByVal dwFlags As Long) As Long
Private Declare Function EnumDisplaySettings Lib "user32.dll" Alias "EnumDisplaySettingsA" (ByVal lpszDeviceName As String, ByVal iModeNum As Long, ByRef lpDevMode As DEVMODE) As Long
Private Sub [B]MaxRefreshRate[/B]()
Dim DM As DEVMODE
Dim DM2 As DEVMODE
Dim Index As Long
Dim Result As Long
Dim RefreshRate As Long
Index = 0
DM.dmSize = Len(DM)
DM2.dmSize = Len(DM2)
EnumDisplaySettings vbNullString, ENUM_CURRENT_SETTINGS, DM2
Do
Result = EnumDisplaySettings(vbNullString, Index, DM)
If Result = 0 Then Exit Do
If DM.dmPelsWidth = DM2.dmPelsWidth Then
If DM.dmPelsHeight = DM2.dmPelsHeight Then
If DM.dmBitsPerPel = DM2.dmBitsPerPel Then
If DM.dmDisplayFrequency > DM2.dmDisplayFrequency Then
DM2 = DM
End If
End If
End If
End If
Index = Index + 1
Loop
If DM2.dmDisplayFrequency > 1 Then
DM2.dmFields = DM_DISPLAYFREQUENCY Or DM_BITSPERPEL Or DM_PELSHEIGHT Or DM_PELSWIDTH
If ChangeDisplaySettings(DM2, CDS_TEST) = 0 Then
ChangeDisplaySettings DM2, 0
End If
End If
End Sub
