一个List1 两个按钮 改分变辩率 Option ExplicitPrivate Declare Function ChangeDisplaySettings Lib "user32" Alias "ChangeDisplaySettingsA" (lpDevMode As Any, ByVal dwflags As Long) As Long Private Declare Function EnumDisplaySettings Lib "user32" Alias "EnumDisplaySettingsA" (ByVal lpszDeviceName As String, ByVal iModeNum As Long, lpDevMode As Any) As Long Private Declare Function SendMessageByLong& Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) Private Declare Function InvalidateRect Lib "user32" (ByVal hwnd As Long, lprect As Any, ByVal bErase As Long) As Long Private Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As LongPrivate Type RECT Left As Long Top As Long Right As Long Bottom As Long End Type' 设备模式结构 Private Type DEVMODE dmDeviceName As String * 32 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(1 To 32) As Byte dmLogPixels As Integer dmBitsPerPel As Long dmPelsWidth As Long dmPelsHeight As Long dmDisplayFlags As Long dmDisplayFrequency As Long dmICMMethod As Long ' Windows 95 only dmICMIntent As Long ' Windows 95 only dmMediaType As Long ' Windows 95 only dmDitherType As Long ' Windows 95 only dmReserved1 As Long ' Windows 95 only dmReserved2 As Long ' Windows 95 only End TypeConst DM_BITSPERPEL = &H40000 Const DM_PELSWIDTH = &H80000 Const DM_PELSHEIGHT = &H100000 Const DM_DISPLAYFLAGS = &H200000 Const DM_DISPLAYFREQUENCY = &H400000Const DISP_CHANGE_SUCCESSFUL = 0 Const DISP_CHANGE_RESTART = 1 Const DISP_CHANGE_FAILED = -1 Const DISP_CHANGE_BADMODE = -2 Const DISP_CHANGE_NOTUPDATED = -3 Const DISP_CHANGE_BADFLAGS = -4 Const DISP_CHANGE_BADPARAM = -5Const CDS_UPDATEREGISTRY = 1 Const CDS_FORCE As Long = &H80000000 Const CDS_RESET = &H40000000Const HWND_BROADCAST = &HFFFF& Const WM_SYSCOLORCHANGE = &H15 Const WM_PALETTECHANGED = &H311 Const WM_DISPLAYCHANGE = &H7E Const WM_SETTINGCHANGE = &H1ADim ModeCube(128) As DEVMODE Dim lproc As Long' 列出显示设备支持的显示模式 Sub LoadDisplayMode() Dim i As Long Dim RS As Long Dim AStr As String
i = 0 ' 遍历所有的显示模式并在List1中显示出来 Do ModeCube(i).dmFields = DM_BITSPERPEL Or DM_PELSWIDTH Or DM_PELSHEIGHT Or DM_DISPLAYFLAGS Or DM_DISPLAYFREQUENCY ModeCube(i).dmSize = Len(ModeCube(i)) '获得显示模式并保存到数组中 RS = EnumDisplaySettings(vbNullString, i, ModeCube(i)) If RS Then AStr = Str$(ModeCube(i).dmPelsWidth) + "*" + Trim$(Str$(ModeCube(i).dmPelsHeight)) + " " Select Case ModeCube(i).dmBitsPerPel Case 4 AStr = AStr + "16色" Case 8 AStr = AStr + "256色" Case 16 AStr = AStr + "16位彩色" Case 24 AStr = AStr + "24位彩色" Case 32 AStr = AStr + "32位彩色" Case Else AStr = AStr + Str$(ModeCube(i).dmBitsPerPel) End Select AStr = AStr + " 刷新频率:" & CStr(ModeCube(i).dmDisplayFrequency) + "Hz" i = i + 1 End If List1.AddItem AStr Loop Until (RS = 0) '获得最后一个显示模式之后EnumDisplaySettings会返回0 End Sub' 设置显示模式 Private Sub Command1_Click() Dim aDev As DEVMODE Dim RS As Long
If List1.ListIndex < 0 Then Exit Sub aDev = ModeCube(List1.ListIndex)
Option ExplicitPrivate Declare Function ChangeDisplaySettings Lib "user32" Alias "ChangeDisplaySettingsA" (lpDevMode As Any, ByVal dwflags As Long) As Long
Private Declare Function EnumDisplaySettings Lib "user32" Alias "EnumDisplaySettingsA" (ByVal lpszDeviceName As String, ByVal iModeNum As Long, lpDevMode As Any) As Long
Private Declare Function SendMessageByLong& Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long)
Private Declare Function InvalidateRect Lib "user32" (ByVal hwnd As Long, lprect As Any, ByVal bErase As Long) As Long
Private Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As LongPrivate Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type' 设备模式结构
Private Type DEVMODE
dmDeviceName As String * 32
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(1 To 32) As Byte
dmLogPixels As Integer
dmBitsPerPel As Long
dmPelsWidth As Long
dmPelsHeight As Long
dmDisplayFlags As Long
dmDisplayFrequency As Long
dmICMMethod As Long ' Windows 95 only
dmICMIntent As Long ' Windows 95 only
dmMediaType As Long ' Windows 95 only
dmDitherType As Long ' Windows 95 only
dmReserved1 As Long ' Windows 95 only
dmReserved2 As Long ' Windows 95 only
End TypeConst DM_BITSPERPEL = &H40000
Const DM_PELSWIDTH = &H80000
Const DM_PELSHEIGHT = &H100000
Const DM_DISPLAYFLAGS = &H200000
Const DM_DISPLAYFREQUENCY = &H400000Const DISP_CHANGE_SUCCESSFUL = 0
Const DISP_CHANGE_RESTART = 1
Const DISP_CHANGE_FAILED = -1
Const DISP_CHANGE_BADMODE = -2
Const DISP_CHANGE_NOTUPDATED = -3
Const DISP_CHANGE_BADFLAGS = -4
Const DISP_CHANGE_BADPARAM = -5Const CDS_UPDATEREGISTRY = 1
Const CDS_FORCE As Long = &H80000000
Const CDS_RESET = &H40000000Const HWND_BROADCAST = &HFFFF&
Const WM_SYSCOLORCHANGE = &H15
Const WM_PALETTECHANGED = &H311
Const WM_DISPLAYCHANGE = &H7E
Const WM_SETTINGCHANGE = &H1ADim ModeCube(128) As DEVMODE
Dim lproc As Long' 列出显示设备支持的显示模式
Sub LoadDisplayMode()
Dim i As Long
Dim RS As Long
Dim AStr As String
i = 0
' 遍历所有的显示模式并在List1中显示出来
Do
ModeCube(i).dmFields = DM_BITSPERPEL Or DM_PELSWIDTH Or DM_PELSHEIGHT Or DM_DISPLAYFLAGS Or DM_DISPLAYFREQUENCY
ModeCube(i).dmSize = Len(ModeCube(i))
'获得显示模式并保存到数组中
RS = EnumDisplaySettings(vbNullString, i, ModeCube(i))
If RS Then
AStr = Str$(ModeCube(i).dmPelsWidth) + "*" + Trim$(Str$(ModeCube(i).dmPelsHeight)) + " "
Select Case ModeCube(i).dmBitsPerPel
Case 4
AStr = AStr + "16色"
Case 8
AStr = AStr + "256色"
Case 16
AStr = AStr + "16位彩色"
Case 24
AStr = AStr + "24位彩色"
Case 32
AStr = AStr + "32位彩色"
Case Else
AStr = AStr + Str$(ModeCube(i).dmBitsPerPel)
End Select
AStr = AStr + " 刷新频率:" & CStr(ModeCube(i).dmDisplayFrequency) + "Hz"
i = i + 1
End If
List1.AddItem AStr
Loop Until (RS = 0) '获得最后一个显示模式之后EnumDisplaySettings会返回0
End Sub' 设置显示模式
Private Sub Command1_Click()
Dim aDev As DEVMODE
Dim RS As Long
If List1.ListIndex < 0 Then Exit Sub
aDev = ModeCube(List1.ListIndex)
RS = ChangeDisplaySettings(aDev, CDS_FORCE)
' 改变完显示模式设置之后向所有的窗口发送显示模式改变消息
RS = SendMessageByLong(HWND_BROADCAST, WM_SYSCOLORCHANGE, 0&, 0&)
RS = SendMessageByLong(HWND_BROADCAST, WM_PALETTECHANGED, Me.hwnd, 0&)
RS = PostMessage(HWND_BROADCAST, WM_SYSCOLORCHANGE, 0&, 0&)
' windows就会重画窗口
RS = InvalidateRect(0&, ByVal 0, 1&)
End Sub' 加载窗体时加载显示系统支持的显示模式
Private Sub Form_Load()
LoadDisplayMode
End Sub