Dynamic changing screen settings' - definition
Private Declare Function Lstrcpy_
LIB "kernel32" alias "lstrcpya" _
(lpstring1 as any, lpstring2 as any) _
As long
Const cchdevicename = 32
Const cchformname = 32
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 in
DMBITSPEL AS INTEGER
DMPELSWIDTH AS Long
DMPELSHEIGHT AS long
DMDISPLAYFLAGS As Long
DMDisplayFrequency As Long
End Type
Private Declare Function_
ChangeDisplaySettings LIB _
"User32" Alias "ChangeDisplaySettingsa" (_
Byval LPDEVMODE As Long, _
BYVAL DWFLAGS As long) As long
'- function
Public Function setDisplayMode (Width as _
Integer, Height AS Integer, Color As_
Integer) As Long
Const DM_PELSWIDTH = & h80000
Const DM_PELSHEIGHT = & h100000
Const DM_BITSPEL = & H40000
Dim newdevmode as devmode
Dim PDEVMODE AS Long
With Newdevmode
.dmsize = 122
IF color = -1 Then
.dmfields = DM_PELSWIDTH OR DM_PELSHEIGHT
Else
.dmfields = DM_PELSWIDTH OR _
DM_PELSHEIGHT OR DM_BITSPERPEL
END IF
.dmpelswidth = width
.dmpelsheight = height
IF color <> -1 Then
.dmbitsperpel = color
END IF
End with
PDEVMODE = LSTRCPY (NewDevmode, NewDevmode)
SetDisplayMode = ChangeDisplaySettings (PDEVMODE, 0) End Function
Example call: change to 640x480x24 bit:
i = setDisplaymode (640, 480, 24)
If you successfully returns 0.
