change.bas

一个商场财务系统

Attribute VB_Name = "Module3"
   Private Declare Function Lstrcpy Lib "kernel32" Alias "lstrcpyA" (lpString1 As Any, lpString2 As Any) As Long
   Private Declare Function ChangeDisplaySettings Lib "User32" Alias "ChangeDisplaySettingsA" (ByVal lpDevMode As Long, ByVal dwflags As Long) As Long
   Public Declare Function SystemParametersInfo Lib "User32" Alias "SystemParametersInfoA" (ByVal uAction As Long, ByVal uParam As Long, ByVal lpvParam As Any, ByVal fuWinIni As Long) As Long
Private Type RECT
  Left As Long
  Top As Long
  Right As Long
  Bottom As Long
End Type
Public apiRECT As RECT
Public Const SPI_GETWORKAREA = 48
Const CCHDEVICENAME = 32
Const CCHFORMNAME = 32
Private Type DEVMODE
    dmDeviceName As String * CCHDEVICENAME
    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 * CCHFORMNAME
    dmUnusedPadding As Integer
    dmBitsPerPel As Integer
    dmPelsWidth As Long
    dmPelsHeight As Long
    dmDisplayFlags As Long
    dmDisplayFrequency As Long
End Type
' 动态改变屏幕设置的函数
    Public Function SetDisplayMode(Width As Integer, Height As Integer, Color As Integer) As Long
    Const DM_PELSWIDTH = &H80000
    Const DM_PELSHEIGHT = &H100000
    Const DM_BITSPERPEL = &H40000
    Dim NewDevMode As DEVMODE
    Dim pDevmode As Long
    With NewDevMode
        .dmSize = 122
        If Color = -1 Then
            .dmFields = DM_PELSWIDTH Or DM_PELSHEIGHT
        Else
            .dmFields = DM_PELSWIDTH Or DM_PELSHEIGHT Or DM_BITSPERPEL
        End If
        .dmPelsWidth = Width
        .dmPelsHeight = Height
        If Color <> -1 Then
        .dmBitsPerPel = Color
        End If
    End With
    pDevmode = Lstrcpy(NewDevMode, NewDevMode)
    SetDisplayMode = ChangeDisplaySettings(pDevmode, 0)
End Function