Adust the screen size

[Eswar]

Hi Everybody,

Can the screen resolution be changed from 800x600 to 800x400 or from 640x480 to 640x280


Please do help me ASAP.

With Thanks,
Eswar.

[steve7946]

Hi, i found this on the web, i think it should help you. i have not tryed the code so i don't know.

'**************************************
'Windows API/Global Declarations for :Ch
'     angeRes
'**************************************


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
    Private Const CCDEVICENAME = 32
    Private Const CCFORMNAME = 32
    Private Const DM_BITSPERPEL = &H60000
    Private Const DM_PELSWIDTH = &H80000
    Private Const DM_PELSHEIGHT = &H100000


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

'**************************************
' Name: ChangeRes
' Description:This Function will change 
'     your Windows Resolution. It is very simp
'     le, and it does what most Resolution Cha
'     nge Functions don't do, it changes the t
'     he Bits Per Pixels as well as the Screen
'     Width and Height.
' By: ScAnFrEaK
'
'
' Inputs:Dim RetValue As Integer
RetValue = ChangeRes(800, 600, 32)
'
' Returns:1 = Resolution Successfully Ch
'     anged
0 = Resolution Was Not Changed
'
'Assumes:None
'
'Side Effects:None
'This code is copyrighted and has limite
'     d warranties.
'Please see http://www.Planet-Source-Cod
'     e.com/xq/ASP/txtCodeId.1943/lngWId.1/qx/
'     vb/scripts/ShowCode.htm
'for details.
'**************************************



Function ChangeRes(Width As Single, Height As Single, BPP As Integer) As Integer
    On Error GoTo ERROR_HANDLER
    Dim DevM As DEVMODE, I As Integer, ReturnVal As Boolean, _
    RetValue, OldWidth As Single, OldHeight As Single, _
    OldBPP As Integer
    Call EnumDisplaySettings(0&, -1, DevM)
    OldWidth = DevM.dmPelsWidth
    OldHeight = DevM.dmPelsHeight
    OldBPP = DevM.dmBitsPerPel
    I = 0


    Do
        ReturnVal = EnumDisplaySettings(0&, I, DevM)
        I = I + 1
    Loop Until (ReturnVal = False)
    DevM.dmFields = DM_PELSWIDTH Or DM_PELSHEIGHT Or DM_BITSPERPEL
    DevM.dmPelsWidth = Width
    DevM.dmPelsHeight = Height
    DevM.dmBitsPerPel = BPP
    Call ChangeDisplaySettings(DevM, 1)
    RetValue = MsgBox("Do You Wish To Keep Your Screen Resolution To " & Width & "x" & Height & " - " & BPP & " BPP?", vbQuestion + vbOKCancel, "Change Resolution Confirm:")


    If RetValue = vbCancel Then
        DevM.dmPelsWidth = OldWidth
        DevM.dmPelsHeight = OldHeight
        DevM.dmBitsPerPel = OldBPP
        Call ChangeDisplaySettings(DevM, 1)
        MsgBox "Old Resolution(" & OldWidth & " x " & OldHeight & ", " & OldBPP & " Bit) Successfully Restored!", vbInformation + vbOKOnly, "Resolution Confirm:"
        ChangeRes = 0
    Else
        ChangeRes = 1
    End If
    Exit Function
    ERROR_HANDLER:
    ChangeRes = 0
End Function

[Eswar]

Hi Steve7946, Thanks for your help, it is quite helpful to me, but there is only one problem with ChangeDisplaySettings, i think it will work with 16-bit only, but i want the same to work with 32-bit and i found out that the function should be ChangeDisplaySettingsEX, but i found that there is no entry in my Win32api.txt file which is there with me... could you please help out to solve the problem.. With Thanks Eswar.

[V(ery) Basic]

The declare is

Public Declare Function ChangeDisplaySettingsEx _ 
 Lib "user32.dll" Alias "ChangeDisplaySettingsExA" (ByVal _ 
 lpszDeviceName As String, ByRef lpDevMode As DEVMODE, _ 
 ByVal hwnd As Long, ByVal dwflags As Long, lParam As Any) As Long

and the site explaining how to use it is:

http://msdn.microsoft.com/library/ps...vcons_3tfc.htm

Sorry I couldn't provide my own example, but it's WAY too early in the morning.

Me.

[Eswar]

Hi,

Thanks for the code help given to me, but actually it is not working in my code properly... can you please send me the example you have done...


With Thanks and Regards,
Eswar.