VB中利用API函数实现屏幕颜色数设定

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　　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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