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Const CCDEVICENAME = 32
Const CCFORMNAME = 32
Const DM_PELSWIDTH = &H80000
Const DM_PELSHEIGHT = &H100000
Const CDS_TEST = &H4
Private Type DISPLAY_DEVICE
cb As Long
DeviceName As String * 32
DeviceString As String * 128
StateFlags As Long
DeviceID As String * 128
DeviceKey As String * 128
End Type
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
dmICMMethod As Long 'NT 4.0
dmICMIntent As Long 'NT 4.0
dmMediaType As Long 'NT 4.0
dmDitherType As Long 'NT 4.0
dmReserved1 As Long 'NT 4.0
dmReserved2 As Long 'NT 4.0
dmPanningWidth As Long 'Win2000
dmPanningHeight As Long 'Win2000
End Type
Private Declare Function ChangeDisplaySettingsEx Lib "user32" Alias "ChangeDisplaySettingsExA" (lpszDeviceName As Any, lpDevMode As Any, ByVal hWnd As Long, ByVal dwFlags As Long, lParam As Any) As Long
Private Declare Function EnumDisplayDevices Lib "user32" Alias "EnumDisplayDevicesA" (Unused As Any, ByVal iDevNum As Long, lpDisplayDevice As DISPLAY_DEVICE, ByVal dwFlags As Long) As Boolean
Dim OldX As Long, OldY As Long, T As Long
Private Sub Form_Load()
'KPD-Team 2000
'URL: http://www.allapi.net/
'E-Mail: KPDTeam@Allapi.net
Dim DD As DISPLAY_DEVICE, DevM As DEVMODE
DD.cb = Len(DD)
OldX = Screen.Width / Screen.TwipsPerPixelX
OldY = Screen.Height / Screen.TwipsPerPixelY
'First retieve some display info
If EnumDisplayDevices(ByVal 0&, 0, DD, ByVal 0&) Then
'and show it
Me.AutoRedraw = True
Me.Print "Device String:" + Left$(DD.DeviceString, InStr(1, DD.DeviceString, Chr$(0)) - 1)
Me.Print "Device Name:" + Left$(DD.DeviceName, InStr(1, DD.DeviceName, Chr$(0)) - 1)
Me.Print "Device Key:" + Left$(DD.DeviceKey, InStr(1, DD.DeviceKey, Chr$(0)) - 1)
Me.Print "Device ID:" + Left$(DD.DeviceID, InStr(1, DD.DeviceID, Chr$(0)) - 1)
Else
Me.Print "Error while retrieving Display Information"
End If
DevM.dmSize = Len(DevM)
'we want to change the horizontal and the vertical resolution
DevM.dmFields = DM_PELSWIDTH Or DM_PELSHEIGHT
DevM.dmPelsWidth = 640
DevM.dmPelsHeight = 480
'change the display settings
Call ChangeDisplaySettingsEx(ByVal 0&, DevM, ByVal 0&, CDS_TEST, ByVal 0&)
T = Timer
Do: DoEvents: Loop Until Timer > T + 5
DevM.dmPelsWidth = OldX
DevM.dmPelsHeight = OldY
'change the display settings back to the old settings
Call ChangeDisplaySettingsEx(ByVal 0&, DevM, ByVal 0&, CDS_TEST, ByVal 0&)
End Sub
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