如何得到并调整分辨率,希望给出源码

[yell]

[chenjun]

声明：
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

Private Const CCHDEVICENAME = 32
Private Const CCHFORMNAME = 32

Private Type DEVMODE’详细参考MSDN
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

Public Function SetScreen
(Width As Integer,
Height As Integer, Optional Color
As Integer = 16) As Long'这里的
16指的是真16色
Const DM_PELSWIDTH = &H80000
Const DM_PELSHEIGHT = &H100000
Const DM_BITSPERPEL = &H40000
Dim NewDevMode As DEVMODE
Dim pDevmode As Long

With NewDevMode
.dmSize = Len(NewDevMode)'一般为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


Private Sub Change_Click()
SetScreen Val(Text1), Val(Text2), Val(Text3)
End Sub

’下面三个文本框分别存放分辨率和颜色值
Private Sub Text1_GotFocus()
Text1.SelStart = 0
Text1.SelLength = Len(Text1)
End Sub

Private Sub Text2_GotFocus()
Text2.SelStart = 0
Text2.SelLength = Len(Text1)
End Sub

Private Sub Text3_GotFocus()
Text3.SelStart = 0
Text3.SelLength = Len(Text1)
End Sub

[OUYAN]

（1）得到屏幕分辨率
Private Sub Form_Load()
Dim intWidth As Integer
Dim intHeight As Integer
intWidth = Screen.Width \ Screen.TwipsPerPixelX
intHeight = Screen.Height \ Screen.TwipsPerPixelY
MsgBox "Screen 分辨率:" + vbCrLf + vbCrLf + Str$(intWidth) + " x" + Str$(intHeight), 64, "Info"
End Sub

(2)设定分辨率要用到二个API:
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 CDS_UPDATEREGISTRY = 1
Const DM_PELSWIDTH = &H80000
Const DM_PELSHEIGHT = &H100000

Private Type DEVMODE '定义一个结构
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 As String * 32
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 i As Long
Dim b As Long
Dim ans As Long
Dim a As Long
a = EnumDisplaySettings(0, 0, DevM)
DevM.dmFields = DM_PELSWIDTH Or DM_PELSHEIGHT
DevM.dmPelsWidth = 640 '设定成想要的解析度
DevM.dmPelsHeight = 480
b = ChangeDisplaySettings(DevM, CDS_UPDATEREGISTRY)
End Sub

[0xFFCD]

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