如何设定屏幕颜色数

• 
  　　如何设定屏幕颜色数
  
  　
  
  　　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          注释： 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) 注释：Initial Setting
       DevM.dmBitsPerPel = 8 注释：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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