# Re: 如何写一个与萤幕解析度无关的程式!

Posted by Jan Yeh on November 27, 1999 at 02:26:27:

In Reply to: 如何写一个与萤幕解析度无关的程式! posted by Roger on November 26, 1999 at 19:41:11:

小弟觉得至少有三个作法，一个是把FORM以640*480的大小做好之后，配合萤幕解析度调整FORM的位置即可：另一个方式是在FORM里面的控制项都依照解析度大小来调整大小或位置(可参阅CWW网页，记得有范例说...http://www.hosp.ncku.edu.tw/~cww/htm21.htm)；也可以在程式开始就把解析度调到你预设的解析度，执行完毕在调回来。

取得解析度
x = Screen.Width \ Screen.TwipsPerPixelX
y = Screen.Height \ Screen.TwipsPerPixelY

设定解析度
<以下的程式码似乎是转载自CWW的网页？！忘记了... :>
原则上，只改这一次，下一次开机会还原，但如果需重开机，才会Update
Registry中的设定，并重开机。
如果要永久设定其设定值，请将
b = ChangeDisplaySettings(DevM, 0) 改成
b = ChangeDisplaySettings(DevM, CDS_UPDATEREGISTRY)
----程式开始-----
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 ' 重开机
Const CCDEVICENAME = 32
Const CCFORMNAME = 32
Const DM_PELSWIDTH = &H80000
Const DM_PELSHEIGHT = &H100000

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 i As Long
Dim b As Long
Dim ans as Long
Dim a As Long

a = EnumDisplaySettings(0, 0, DevM) 'Initial Setting

DevM.dmFields = DM_PELSWIDTH Or DM_PELSHEIGHT
DevM.dmPelsWidth = 800 '设定成想要的解析度
DevM.dmPelsHeight = 600
b = ChangeDisplaySettings(DevM, 0) 'Changed Only this time
If b = DISP_CHANGE_RESTART Then
ans = MsgBox("要重开机设定才能完成，重开？", vbOKCancel)
If ans = 1 Then
b = ChangeDisplaySettings(DevM, CDS_UPDATEREGISTRY)
'after this , Will Update in Registry
Call ExitWindowsEx(EWX_REBOOT, 0)
End If
Else
If b <> DISP_CHANGE_SUCCESSFUL Then
Call MsgBox("设定有误", vbCritical)
End If
End If
End Sub

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