VB中利用API函數實現屏幕顏色數設定

領測軟件測試網 　原則上，只改這一次，下一次開機會還原，但如果需重開機，才會Update Registry中的設定，并重開機。

　　如果要永久設定其設定值，請將

b = ChangeDisplaySettings(DevM, 0)

　　改成

b = ChangeDisplaySettings(DevM, CDS_UPDATEREGISTRY)

　　注：

　　DevM.dmBitsPerPel 便是設定顏色數，其實應說每個Pixel要多少Bits來顯示

　　4 --> 16色
　　8 --> 256色
　　16 --> 65536色 以此類推

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 ’ 重開機 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 ’設定成256色 DevM.dmFields = DM_BITSPERPEL b = ChangeDisplaySettings(DevM, 0) If b = DISP_CHANGE_RESTART Then 　ans = MsgBox("要重開機設定才能完成，重開？", 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("設定有誤", vbCritical) 　End If End If End Sub

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