動態改變屏幕設置

動態改變屏幕設置

　　我們經�？吹皆S多 Win95 的應用程序（尤其是游戲）在運行它的時候改變屏幕的設置，運行完后恢復，在 VB 中，我們可以用以下方法實現：

     文中的下劃線(_)為接上一行。
　
定義

'Vb man 2001
'URL: http://goodvbman.yeah.net
'E-mail: coolde@21cn.com

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 Integer
dmBitsPerPel 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

函數

'Vb man 2001
'URL: http://goodvbman.yeah.net
'E-mail: coolde@21cn.com

Public Function SetDisplayMode(Width As _
Integer,Height As Integer, Color As _
Integer) As Long
Const DM_PELSWIDTH = &H80000
Const DM_PELSHEIGHT = &H100000
Const DM_BITSPERPEL = &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

例子調用：改變為 640x480x24位：

i = SetDisplayMode(640, 480, 24)

如果成功返回 0