Screen resolution

At the start of the application I need to set the screen to a specific size. How would I do this?

Try this out:

VB Code:

Public Declare Function EnumDisplaySettings Lib "user32" Alias "EnumDisplaySettingsA" _
(ByVal lpszDeviceName As Long, ByVal iModeNum As Long, lpDevMode As Any) As Boolean
 
Public Declare Function ChangeDisplaySettings Lib "user32" _
Alias "ChangeDisplaySettingsA" (lpDevMode As Any, ByVal dwFlags As Long) As Long
 
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
 
 
Public Sub ChangeScreenSettings()
Dim DevM As DEVMODE
Dim Ans As Long
Dim erg As Long
'Get the info into DevM
erg& = EnumDisplaySettings(0&, 0&, DevM)
'We don't change the colordepth, because a
'rebot will be necessary
 
DevM.dmFields = DM_PELSWIDTH Or DM_PELSHEIGHT 'Or DM_BITSPERPEL
DevM.dmPelsWidth = 1024 'ScreenWidth
DevM.dmPelsHeight = 768 '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 successful
Select Case erg&
Case DISP_CHANGE_RESTART
    Ans = MsgBox("You must reboot for the new resolution to take efect!", vbYesNo + vbSystemModal, "Info")
    If Ans = vbYes Then
        erg& = ExitWindowsEx(EWX_REBOOT, 0&)
    End If
Case DISP_CHANGE_SUCCESSFUL
    erg& = ChangeDisplaySettings(DevM, CDS_UPDATEREGISTRY)
Case Else
    MsgBox "Your Graphics card must be able to support 1024 x 768 resolution!", vbOKOnly + vbSystemModal, "Error"
End Select
End Sub

VB Code:

Private Sub Form_Initialize()
Form1.Height = 3332
Form1.Width = 9372
End Sub