VB调整分辨率后显示不正常

[还有人用VB6吗]

我的程序是1024 X 768 下设计的，在程序里设置了，调整分辨率的函数，如果当前屏幕不是1024 的，我就自动调整分辨率，以适应程序
但现在问题是，每次调整分辨率后运行时，背景窗口图片没有满屏显示，把程序关了，重新运行就正常，请问怎么回事？

[大王派我去巡山]

调整分辨率之后用代码再把窗体最大化。程序没有那么智能，监测到分辨率改变之后就自动调节窗体大小。

[hwmys]

我用的函数

Public Declare Function EnumDisplaySettings Lib "user32" Alias "EnumDisplaySettingsA" (ByVal lpszDeviceName As Long, ByVal iModeNum As Long, lpDevMode As Any) As Boolean
Public Declare Function ChangeDisplaySettings Lib "user32" Alias "ChangeDisplaySettingsA" (lpDevMode As Any, ByVal dwFlags As Long) As Long
Public oldWidth, oldHigh, oldPerpel As Long


Private Const CCDEVICENAME = 32
Private Const CCFORMNAME = 32
Private Const DM_BITSPERPEL = &H40000
Private Const DM_PELSWIDTH = &H80000
Private Const DM_PELSHEIGHT = &H100000
Private Const CDS_UPDATEREGISTRY = &H1
Private Const CDS_TEST = &H4
Private Const DISP_CHANGE_SUCCESSFUL = 0
Private Const DISP_CHANGE_RESTART = 1

Private Const ENUM_REGISTRY_SETTINGS = (-2)
Private Const ENUM_CURRENT_SETTINGS = (-1)

‘刷新频率常量
Private Const DM_DISPLAYFREQUENCY = &H400000

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 DevCurrent As DEVMODE
Private ret As Long
Public Sub ScreenBat(ByVal newWi As Long, ByVal newHi As Long, ByVal newPer As Long, ByVal Scren As String)
If Scren = "1024" Then
        ret = EnumDisplaySettings(0&, ENUM_REGISTRY_SETTINGS, DevM)
        'ret = EnumDisplaySettings(0&, ENUM_CURRENT_SETTINGS, DevCurrent)
        oldWidth = DevM.dmPelsWidth
        oldHigh = DevM.dmPelsHeight
        oldPerpel = DevM.dmBitsPerPel
            'DevM.dmFields = DM_PELSWIDTH Or DM_PELSHEIGHT 'Or DM_BITSPERPEL
            If DevM.dmPelsWidth <> newWi Then DevM.dmPelsWidth = newWi: Scren = "T"   '想要设定的屏幕宽度
            If DevM.dmPelsHeight <> newHi Then DevM.dmPelsHeight = newHi: Scren = "T" '想要设定的屏幕高度
            If DevM.dmBitsPerPel <> newPer Then DevM.dmBitsPerPel = newPer: Scren = "T"  ' (could be 8, 16, 32 or even 4) '此行可用于改变色板
            If Scren = "T" Then Call ChangeDisplaySettings(DevM, CDS_TEST)
ElseIf Scren = "old" Then

        If DevM.dmPelsWidth <> oldWidth Then DevM.dmPelsWidth = oldWidth: Scren = "T"    '恢复屏幕宽度
        If DevM.dmPelsHeight <> oldHigh Then DevM.dmPelsHeight = oldHigh: Scren = "T"  '恢复屏幕高度
        If DevM.dmBitsPerPel <> oldPerpel Then DevM.dmBitsPerPel = oldPerpel: Scren = "T"  ' (could be 8, 16, 32 or even 4) '恢复色板
        If Scren = "T" Then Call ChangeDisplaySettings(DevM, CDS_TEST)

End If
End Sub

[还有人用VB6吗]

我的调整分辨率模块为

'调整屏幕分辨率
Public Function ChangeRes(width As Single, height As Single, BPP As Integer) As Integer
On Error GoTo ERROR_HANDLER
Dim DevM As DEVMODE, i As Integer, ReturnVal As Boolean, _
retvalue ', OldWidth As Single, OldHeight As Single, _
'OldBPP As Integer
Call EnumDisplaySettings(0&, -1, DevM)
OldWidth = DevM.dmPelsWidth
OldHeight = DevM.dmPelsHeight
OldBPP = DevM.dmBitsPerPel
i = 0
Do
ReturnVal = EnumDisplaySettings(0&, i, DevM)
i = i + 1
Loop Until (ReturnVal = False)
DevM.dmFields = DM_PELSWIDTH Or DM_PELSHEIGHT Or DM_BITSPERPEL
DevM.dmPelsWidth = width
DevM.dmPelsHeight = height
DevM.dmBitsPerPel = BPP
Call ChangeDisplaySettings(DevM, 1)
If retvalue = vbCancel Then
DevM.dmPelsWidth = OldWidth
DevM.dmPelsHeight = OldHeight
DevM.dmBitsPerPel = OldBPP
Call ChangeDisplaySettings(DevM, 1)
ChangeRes = 0
Else
ChangeRes = 1
End If
Exit Function
ERROR_HANDLER:
ChangeRes = 0
End Function



利用 ChangeDisplaySettings 调整分辨率后，
用 screen.Width = 11520 （如果分辨率正常为1024 时，screen.Width = 15360 ）
如果程序编译后，调整分辨率后，显示不正常，重启程序，后，显示正常

是不是我的调整分辨率的函数有问题？

[hwmys]

Blog里的地址：http://blog.csdn.net/hwmys/archive/2007/11/17/1890127.aspx

[还有人用VB6吗]

你的函数我也试过了，和我的一样效果
我有个背景窗口，该窗口加载一个图片
Me.PaintPicture Me.Picture, 0, 0, Me.ScaleWidth, Me.ScaleHeight
每次代码强制改变屏幕分辨率后，该图片就不能满屏显示，只有重新运行该程序才能正常满屏显示
我调试追踪后发现 屏幕分辨率改变后，屏幕的宽度属性没有更新，所以该图片没有满屏（ screen.Width = 11520 （如果分辨率正常为1024 时，screen.Width = 15360 ））

[还有人用VB6吗]

感觉好像屏幕分辨率调整后，screen.width 属性没有更新传给窗口

[hwmys]

我的代码一直在“管道燃气客户服务系统”中使用，40多个客户端都正常。
看来应该是你窗口设置的问题了，背景图片如果是固定的就直接绑定在窗口中（picture属性）

[还有人用VB6吗]

和窗口的哪个属性设置有关系？

[还有人用VB6吗]

找到了，BorderStyle 选项的问题，如果设置为2-sizable 或5-sizable toolwindow 就有问题，其他的都OK
但是设置其他的就不显示系统工具栏了，怎么设置才能解决这个问题？

[砸死牛顿的苹果]

BorderStyle 设为1
MinButton 设为True

[还有人用VB6吗]

还是不行