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VB中利用API函数实现屏幕颜色数设定

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VB 中利用 API 函数实现屏幕颜色数设 定
原则上,只改这一次,下一次开机会还原,但如果需重开机,才会 Update Registry 中的设定,并 重开机。 如果要永久设定其设定值,请将 b = ChangeDisplaySettings(DevM, 0) 改成 b = ChangeDisplaySettings(DevM, CDS_UPDATEREGISTRY) 注: DevM.dmBitsPerPel 便是设定颜色数,其实应说每个 Pixel 要多少 Bits 来显示 4 --> 16 色 8 --> 256 色 16 --> 65536 色 以此类推

Option Explicit Private Declare Function EnumDisplaySettings Lib "user32" Alias _ "EnumDisplaySettingsA" (ByVal lpszDeviceName As Long, _ ByVal iModeNum As Long, lpDevMode As Any) As Long Private Declare Function ChangeDisplaySettings Lib "user32" Alias _ "ChangeDisplaySettingsA" (lpDevMode As Any, ByVal dwflags As Long) As Long Private Declare Function ExitWindowsEx Lib "user32" (ByVal uFlags As Long, _ ByVal dwReserved As Long) As Long Const EWX_REBOOT = 2 ’ 重开机 Const CCDEVICENAME = 32 Const CCFORMNAME = 32 Const DM_BITSPERPEL = &H40000 Const DISP_CHANGE_SUCCESSFUL = 0

Const DISP_CHANGE_RESTART = 1 Const CDS_UPDATEREGISTRY = 1 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 Private DevM As DEVMODE Private Sub Command1_Click() Dim a As Boolean Dim i As Long Dim b As Long Dim ans As Long a = EnumDisplaySettings(0, 0, DevM) ’Initial Setting DevM.dmBitsPerPel = 8 ’设定成 256 色 DevM.dmFields = DM_BITSPERPEL b = ChangeDisplaySettings(DevM, 0) If b = DISP_CHANGE_RESTART Then ans = MsgBox("要重开机设定才能完成,重开?", vbOKCancel)

If ans = 1 Then b = ChangeDisplaySettings(DevM, CDS_UPDATEREGISTRY) Call ExitWindowsEx(EWX_REBOOT, 0) End If Else If b <> DISP_CHANGE_SUCCESSFUL Then Call MsgBox("设定有误", vbCritical) End If End If End Sub




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