Private Declare Function GetDeviceCaps Lib "gdi32" (ByVal hdc As Long, ByVal nIndex As Long) As Long Private Declare Function ChangeDisplaySettings Lib "user32" Alias "ChangeDisplaySettingsA" (lpDevMode As Any, ByVal dwflags As Long) As Long Private Const CCDEVICENAME As Long = 32 Private Const CCFORMNAME As Long = 32 Private Const DM_BITSPERPEL As Long = &H40000 Private Const DM_PELSWIDTH As Long = &H80000 Private Const DM_PELSHEIGHT As Long = &H100000 Private Const DM_DISPLAYFLAGS As Long = &H200000 Private Const DM_DISPLAYFREQUENCY = &H400000 Private Const CDS_FORCE As Long = &H80000000 Private Const BITSPIXEL As Long = 12 Private Const HORZRES As Long = 8 Private Const VERTRES As Long = 10 Private Const VREFRESH = 116 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 Sub cmdChangeDesktopMode_Click() Dim DM As DEVMODE With DM .dmPelsWidth = CInt(txtNewWidth.Text) .dmPelsHeight = CInt(txtNewHeight.Text) .dmBitsPerPel = CInt(txtNewColor.Text) .dmDisplayFrequency = CInt(txtNewFreq.Text) .dmFields = DM_PELSWIDTH Or DM_PELSHEIGHT Or DM_BITSPERPEL Or DM_DISPLAYFREQUENCY .dmSize = LenB(DM) End With If ChangeDisplaySettings(DM, CDS_FORCE) <> 0 Then MsgBox "错误!不支持此模式！" End If End Sub Private Sub Form_Load() txtOldWidth.Text = GetDeviceCaps(Me.hdc, HORZRES) txtOldHeight.Text = GetDeviceCaps(Me.hdc, VERTRES) txtOldColor.Text = GetDeviceCaps(Me.hdc, BITSPIXEL) txtOldFreq.Text = GetDeviceCaps(Me.hdc, VREFRESH) End Sub
